(en)A system includes a first hand-held power tool, a second hand-held power tool, and a rechargeable battery of a voltage class. The first hand-held power tool includes a first interface for the rechargeable battery, an electronically commutated electric motor of a defined construction size, a first electronic unit configured to supply the electronically commutated electric motor with power, and a first switch element configured to activate the electronically commutated electric motor. The second hand-held power tool includes a second interface for the rechargeable battery, an electronically commutated electric motor of a defined construction size, a second electronic unit configured to supply the electronically commutated electric motor with power, and a second switch element configured to activate the electronically commutated electric motor. The rechargeable battery is configured for contact can be in contact with both the first interface and the second interface.

1.ApplicationNumber: US-201515315843-A
1.PublishNumber: US-2017106520-A1
2.Date Publish: 20170420
3.Inventor: SCHADOW JOACHIM
ESENWEIN FLORIAN

4.Inventor Harmonized: SCHADOW JOACHIM(DE)
ESENWEIN FLORIAN(DE)

5.Country: US
6.Claims:
(en)A system includes a first hand-held power tool, a second hand-held power tool, and a rechargeable battery of a voltage class. The first hand-held power tool includes a first interface for the rechargeable battery, an electronically commutated electric motor of a defined construction size, a first electronic unit configured to supply the electronically commutated electric motor with power, and a first switch element configured to activate the electronically commutated electric motor. The second hand-held power tool includes a second interface for the rechargeable battery, an electronically commutated electric motor of a defined construction size, a second electronic unit configured to supply the electronically commutated electric motor with power, and a second switch element configured to activate the electronically commutated electric motor. The rechargeable battery is configured for contact can be in contact with both the first interface and the second interface.

7.Description:
(en)The invention relates to a system at least comprising an electronically commutated electric motor of a defined construction size and a rechargeable battery of at least one voltage class.
PRIOR ART
Disclosure of the Invention
The system according to the invention with the features of the independent claim comprises at least one first hand-held power tool, which has at least one first interface, which can correspond with at least one rechargeable battery of a voltage class. “Correspond” is intended to be understood here as meaning in particular that a rechargeable battery is provided for supplying the hand-held power tool with electrical energy. The electrical energy may be transmitted by way of the interface of the hand-held power tool. The energy transmission may take place in a cable-bound or cableless manner. The cableless energy transmission may take place for example by way of inductive energy transmission.
The system also comprises at least one electronically commutated electric motor of a defined construction size. A construction size is intended to be understood here as meaning a length and a diameter. The length of the electronically commutated electric motor is defined on the basis of a package length. The diameter is formed by the diameter of a motor housing.
At least one first electronic unit is provided at least for controlling the electronically commutated electric motor in an open-loop and/or closed-loop manner. “Controlling in an open-loop manner” is intended to be understood as meaning in particular that the electronic unit provides an activation signal for the electronically commutated electric motor independently of a parameter of the electronically commutated electric motor. “Controlling in a closed-loop manner” is intended to be understood as meaning in particular that the electronic unit provides an activation signal for the electronically commutated electric motor in dependence on a parameter of the electronically commutated electric motor.
At least one first switching element activates the electronically commutated electric motor. “Activates” is intended to be understood as meaning that, when the switching element is actuated, the electronically commutated electric motor begins to rotate.
The system also comprises at least one second hand-held power tool, which has at least one second interface, which can correspond with the rechargeable battery of a voltage class. At least one second electronic unit is provided for controlling the electronically commutated electric motor in an open-loop and/or closed-loop manner. At least one second switching element is provided for activating the electronically commutated electric motor.
The system also comprises at least one rechargeable battery of a voltage class. It is proposed that the rechargeable battery of a voltage class either can correspond with the first interface of the first hand-held power tool or can correspond with the second interface of the second hand-held power tool. “Correspond” is intended to be understood here as meaning in particular “connect” or “attach”. Advantageously, the rechargeable battery of a voltage class may consequently supply either the first hand-held power tool with electrical energy or the second hand-held power tool with electrical energy. This has the advantage that the system according to the invention can be handled flexibly.
Advantageous developments of the system according to the main claim are possible by the features that are presented in the subclaims.
In an advantageous embodiment, the electronically commutated electric motor is accommodated by a first housing part of the hand-held power tool.
Advantageously, the electronically commutated electric motor defines a first axis, which lies coaxially in relation to an output shaft. The output shaft is provided at least for driving a machining tool. Advantageously, the electronically commutated electric motor drives the output shaft directly. “Directly” is intended to be understood here as meaning in particular that the electronically commutated electric motor is connected to the machining tool by way of the output shaft without a conventional gear mechanism in between. As a result, a high level of efficiency is achieved while minimizing wear. The fact that the length of the electronically commutated electric motor defines a length of the first housing part means that a compact type of construction of the first housing part can be achieved, since installation space can be saved by omitting a conventional gear mechanism. This creates installation space in the hand-held power tool that is suitable for accommodating electric motors that are suitable for delivering high torques, and therefore can operate while dispensing with a gear mechanism as a direct drive.
In an advantageous embodiment, the electronic unit is at least partially accommodated by a second housing part. In this embodiment, the electronic unit is arranged at least in an x direction of the second housing part at least partially between the interface and the first housing part. The “x direction” is intended to be understood here as meaning in particular the main direction of extent of the second housing part. In this way, a compact type of construction of the second housing part is achieved.
In an advantageous embodiment, the rechargeable battery is at least partially integrated in the second housing part. It is particularly advantageous if the second housing part accommodates a large part of a battery length l B . A “large part of a battery length l B ” is intended to be understood here as meaning in particular a proportion that corresponds to greater than 50% of the battery length l B . As a result, a type of construction that is compact in the main direction of extent of the hand-held power tool is achieved.
Advantageously, the rechargeable battery with the second housing part defines a second axis, which lies coaxially in relation to the pushing-in direction of the rechargeable battery.
In a further advantageous embodiment, the rechargeable battery is at least partially arranged on the second housing part and a large part of the battery length l B lies outside the second housing part, the rechargeable battery with the second housing part forming a second common axis, which lies at an angle, in particular a right angle, to the pushing-in direction of the rechargeable battery. In this way, a further type of construction that is compact in the main direction of extent of the hand-held power tool is achieved.
In an advantageous embodiment, the first axis lies at an angle a to the second axis that lies between 60° and 120°, particularly between 80° and 100°, but with preference is approximately 90°.
In a further advantageous embodiment, the first axis lies at an angle a to the second axis that lies between 10° and 20°, particularly between 5° and 10°, but with preference is approximately 0°.
Advantageously, the second housing part is formed as a handle. Particularly advantageously, the second housing part serves as a handle. The term “handle” is intended to be understood here as meaning in particular a component around which at least one hand of an operator can be at least partially placed in order to guide the hand-held power tool.
Advantageously, a hand-held power tool is provided with a mechanical interface, which allows the hand-held power tool to be connected to the rechargeable battery or allows the connection to be released again. Consequently, the rechargeable battery is exchangeable, which makes flexible handling of the system possible.
Advantageously, the switching element is arranged in the second housing part, it being possible for the switching element to be configured as a switching slide, as a dead man's switch, as an accelerating switch or as an arresting switch. However, it is also conceivable that the switching element is configured as an electronic switch, as a sensor switch or the like. Multiple switching elements may form a switching system that can be flexibly selected from.
In an advantageous embodiment of the electronically commutated electric motor, the electronically commutated electric motor has a length l 2 , which lies between 12 and 30 mm, particularly between 15 and 25 mm, but with preference between 18 and 24 mm. Furthermore, in this embodiment the electronically commutated electric motor has a diameter d 1 , which lies between 30 and 50 mm, particularly between 35 and 44 mm, but with preference is 38 mm. In this way, a powerful hand-held power tool combined with a compact type of construction of the first housing part is achieved.
In a further advantageous embodiment of the electronically commutated electric motor, the electronically commutated electric motor has a length l 2 , which lies between 10 and 30 mm, particularly between 15 and 25 mm, but with preference is 20 mm. Furthermore, in this embodiment the electronically commutated electric motor has a diameter d 2 , which lies between 30 and 50 mm, particularly between 35 and 45 mm, but with preference is 44 mm. In this way, a powerful hand-held power tool combined with a compact type of construction of the first housing part is achieved.
In a further advantageous embodiment of the electronically commutated electric motor, the electronically commutated electric motor has a length l 3 , which lies between 10 and 35 mm, particularly between 15 and 30 mm, but with preference is 26 mm. Furthermore, in this embodiment the electronically commutated electric motor has a diameter d 3 , which lies between 40 and 60 mm, particularly between 45 and 55 mm, but with preference is 50 mm. In this way, a powerful hand-held power tool combined with a compact type of construction of the first housing part is achieved.
Advantageously, the electronically commutated electric motor may be formed as an internal-rotor motor or as an external-rotor motor. If the electronically commutated electric motor is an internal-rotor motor, high rotational speeds and a high power density are achievable. If the electronically commutated electric motor is an external-rotor motor, the electromotive drive is robustly designed and can deliver high torques from a standstill. Such a drive is accordingly particularly suitable for applications in which high torques are required in particular at low rotational speeds.
Advantageously, the electronically commutated electric motor has a rotor and a sensor element. The sensor element is advantageously provided for ascertaining an angular position of the rotor, which is evaluated by the electronic unit. This allows particularly advantageously a commutation to take place and the required torque of the electronically commutated electric motor to be produced. However, it is also conceivable that the commutation takes place without a sensor.
In a particularly advantageous embodiment, a length of the first housing part lies between 50 and 150 mm, in particular between 80 and 120 mm. With particular preference, however, the length of the first housing part is 100 mm. This is realized by the compact type of construction of the electronically commutated electric motor, which decisively defines the length of the first housing part.
Advantageously, the electronic unit is connected to the electronically commutated electric motor. This advantageously allows at least one parameter concerning the electronically commutated electric motor to be monitored. The parameter may be a rotational speed, a current and/or a voltage of the electronically commutated electric motor. By means of a setpoint-value/actual-value comparison of at least one value of the parameter which concerns the electronically commutated electric motor, the electronic unit calculates at least one activation signal for the electronically commutated electric motor.
Advantageously, the electronic unit is connected to an internal switch. An internal switch is intended to be understood here as meaning a switch that is activated by actuation of the external switching element.
Advantageously, at least one parameter concerning the internal switch can thereby be monitored. The parameter may be a short-circuit current, which flows by way of a switching contact. By means of a setpoint-value/actual-value comparison of at least one value of the parameter which concerns the internal switch, the electronic unit calculates at least one activation signal for the electronically commutated electric motor.
Advantageously, the electronic unit may be connected to the rechargeable battery. This advantageously allows at least one parameter concerning the rechargeable battery to be monitored. The parameter is at least a capacity of the rechargeable battery and/or an overload state of the rechargeable battery. By means of a setpoint-value/actual-value comparison of at least one value of the parameter which concerns the rechargeable battery, the electronic unit calculates at least one activation signal for the electronically commutated electric motor.
With preference, the battery voltage lies in a range between 3.6 and 42 V, in particular between 7.2 and 18 V. With particular preference, the battery voltage is however 10.8 V. The values of the battery voltage do not take into account possible battery voltage fluctuations.
In order that the electronically commutated electric motor can be operated at an optimum operating point or can operate efficiently, in an advantageous embodiment it is possible to switch over between an eco mode and a boost mode.
An “eco mode” is intended to be understood as meaning in particular a mode in which the electronically commutated electric motor is operated particularly efficiently. “Efficiently” is intended to be understood here as meaning that the electronically commutated electric motor is operated at an optimum operating point.
A “boost mode” is intended to be understood as meaning a mode in which the electronically commutated electric motor is operated particularly powerfully. The power requirement for the electronically commutated electric motor may in this case be time-limited and possibly lie in the overload range of the electronically commutated electric motor. The boost mode can be activated by way of a switch. In the boost mode, the power peak of the electronically commutated electric motor lies between 10% and 100%, particularly between 20% and 50%, but with preference at 33%. The time limitation of the boost mode lies between 0 and 5 min, particularly between 0 and 2.5 min. With preference, the time limitation of the boost mode lies between 30 s and 1 min.
With preference, the hand-held power tool is configured at least in one of the following embodiments:
a. angle grinder b. eccentric grinder c. straight grinder d. oscillating multitool e. router f. electric scraper g. jigsaw h. circular saw i. riveter j. sander

Further advantageous and expedient embodiments can be taken from the description of the figures and the drawings.



DRAWINGS
The system according to the invention, the components according to the invention and the hand-held power tools according to the invention are shown in the drawings, in which:
FIG. 1 shows the system according to the invention in a schematic representation,
FIG. 2 shows a partial view of a first hand-held power tool according to the invention in a schematic representation,
FIG. 3 shows a partial view of a second housing part in a schematic representation,
FIG. 4 shows a partial view of a second hand-held power tool according to the invention in a schematic representation,
FIG. 5 shows a first electronically commutated electric motor of a defined construction size in a schematic representation,
FIG. 5 a shows a partial view of the first electronically commutated electric motor of a defined construction size in a schematic representation,
FIG. 6 shows a second electronically commutated electric motor of a defined construction size in a schematic representation,
FIG. 6 a shows a partial view of the second electronically commutated electric motor of a defined construction size in a schematic representation,
FIG. 7 shows a third electronically commutated electric motor of a defined construction size in a schematic representation,
FIG. 7 a shows a partial view of the third electronically commutated electric motor of a defined construction size in a schematic representation,
FIG. 8 shows a partial view of an external-rotor motor in a schematic representation,
FIG. 9 shows a second embodiment of the first hand-held power tool according to the invention in a schematic representation,
FIG. 10 shows a third embodiment of the first hand-held power tool according to the invention in a schematic representation,
FIG. 11 shows a third hand-held power tool according to the invention in a schematic representation,
FIG. 11 a shows a partial view of the third hand-held power tool according to the invention in a schematic representation,
FIG. 12 shows a partial view of the second hand-held power tool according to the invention in a schematic representation,
FIG. 12 a shows a partial view of a further embodiment of the second hand-held power tool according to the invention in a schematic representation,
FIG. 13 shows a partial view of a fourth hand-held power tool according to the invention in a schematic representation,
FIG. 14 shows a fifth hand-held power tool according to the invention in a schematic representation,
FIG. 15 shows a partial view of a sixth hand-held power tool according to the invention in a schematic representation,
FIG. 15 a shows a view of the sixth hand-held power tool according to the invention, partially in an exploded representation,
FIG. 15 b shows a view of a further embodiment of the sixth hand-held power tool according to the invention in a schematic representation,
FIG. 16 shows a seventh hand-held power tool according to the invention in a schematic representation,
FIG. 17 shows an eighth hand-held power tool according to the invention in a schematic representation,
FIG. 18 shows a ninth hand-held power tool according to the invention in a schematic representation,
FIG. 19 shows a tenth hand-held power tool according to the invention in a schematic representation.



DESCRIPTION
The same reference numerals are used for the same components occurring in the different exemplary embodiments.
FIG. 1 shows a system 10 , which comprises an electronically commutated electric motor 12 of a defined construction size and a rechargeable battery 14 of a voltage class. The rechargeable battery 14 serves as an electrical energy source for various hand-held power tools 16 a to 16 j , but at least for a first hand-held power tool 16 a , as represented in FIG. 2 . In the exemplary embodiment in FIG. 2 , the hand-held power tool 16 a is formed as an angle grinder. In another embodiment, the hand-held power tool 16 b to 16 j is formed as an eccentric grinder, as a straight grinder, as an oscillating multitool, as a router, as an electric scraper, as a jigsaw, as a circular saw, as a riveter or as a sander. The first hand-held power tool 16 a is provided with an electronically commutated electric motor 12 a and a rechargeable battery 14 . The electronically commutated electric motor 12 a has within the limits of certain production tolerances a defined construction size. Arranged between the electronically commutated electric motor 12 a and the rechargeable battery 14 is a first interface 18 a for the rechargeable battery 14 . An electronic unit 20 a is provided for controlling the electronically commutated motor 12 a in an open-loop and/or closed-loop manner. When a switching element 22 a is actuated, the electronically commutated electric motor 12 a is activated.
A second hand-held power tool 16 b is represented in FIG. 4 as an eccentric grinder. The second hand-held power tool 16 b is provided with an electronically commutated electric motor 12 b of a defined construction size and a rechargeable battery 14 . Arranged between the electronically commutated electric motor 12 b and the rechargeable battery 14 is a second interface 18 b . A second electronic unit 20 b is provided for controlling the electronically commutated electric motor 12 b in an open-loop and/or closed-loop manner. When a second switching element 22 b is actuated, the electronically commutated electric motor 12 b is activated. The rechargeable battery 14 is intended both to be attachable to the first interface 18 a and to serve as an energy source for the first hand-held power tool 16 a , and to be attachable to the second interface 18 b and to serve as an energy source for the second hand-held power tool 16 b . That is to say that the rechargeable battery 14 may serve as an energy source for the hand-held power tools 16 a to 16 j of different types.
As evident in FIG. 2 , the electronically commutated electric motor 12 a is accommodated by a first housing part 30 a . The electronically commutated electric motor 12 a drives an output shaft 32 a , which is likewise accommodated by the first housing part 30 a . The output shaft 32 a continues in a tool spindle 24 a . The electronically commutated electric motor 12 a drives the tool spindle 24 a directly. Directly means that the electronically commutated electric motor 12 a is connected to the tool spindle 24 a without a conventional gear mechanism in between. On account of this structural design, the length of the electronically commutated electric motor 12 a decisively defines the length l G1 of the first housing part 30 a.
That is to say that installation space can be saved by omitting a conventional gear mechanism. Requirements for installation space also arise at least as a result of the installation of motor bearings 23 a1 , 23 a2 .
A machining tool 25 a is arranged on the output side. In the exemplary embodiment in FIGS. 2 and 3 , the machining tool 25 a is for example a grinding, roughing or cut-off wheel. The electronically commutated electric motor 12 a forms with the first housing part 30 a a first axis 26 a . The first axis 26 a lies coaxially in relation to the output shaft 32 a.
The electronic unit 20 a is accommodated by a second housing part 34 a . The second housing part 34 a is arranged between the first housing part 30 a and the rechargeable battery 14 . The two housing parts 30 a and 34 a may be configured in one piece or as separate component units. As separate component units, the two housing parts may be screwed or welded or the like. The two housing parts may be connected to one another for rotation with respect to one another. The electronic unit 20 a is arranged in the second housing part 34 a in such a way that the geometrical dimension of the electronic unit 20 a in the x direction of the second housing part 34 a intersects with a large part of a battery length l B of the rechargeable battery 14 in the x direction of the second housing part 34 a . This allows a maximum amount of installation space to be saved. In the exemplary embodiment in FIGS. 2 and 3 , the proportion of the “large part of a battery length l B ” is greater than 50% of the battery length 1 B .
Together with the second housing part 34 a , the rechargeable battery 14 forms a second axis 28 a . The second axis 28 a in this case passes through the rechargeable battery 14 and extends along the second housing part 34 a in an axial direction of the second housing part 34 a . The axial direction is defined here as the x direction of the hand-held power tool 10 a.
The two axes 26 a and 28 a are at an angle a to one another that lies between 60° and 120°, but particularly between 80° and 100°. With preference, the angle a between the first axis 26 a and the second axis 28 a is however approximately 90°. The figure given for the angle does not take into account any production tolerances.
In another advantageous embodiment, the two axes 26 a and 28 a are at an angle a to one another that lies between 10° and 20°, particularly between 5° and 10°, but with preference is approximately 0°.
In a further advantageous embodiment ( FIG. 3 ), the rechargeable battery 14 is arranged on the second housing part 34 a in such a way that a large part of the battery length l B lies outside the second housing part 34 a . The second axis 28 a lies here at an angle, in particular a right angle, in relation to the pushing-in direction of the rechargeable battery 14 .
The second housing part 34 a is formed as a handle or serves as a handle. The term “handle” is intended to be understood here as meaning a component around which at least one hand of an operator can be at least partially placed in order to guide the hand-held power tool 16 a.
In the exemplary embodiment, the first interface 18 a is a mechanical interface. The mechanical interface establishes a mechanically fixed, but releasable connection between the two housing parts 30 a , 34 a . The first housing part 30 a is connected to the second housing part 34 a by way of the mechanical interface 18 a securely, but such that it can be released manually or by a suitable tool.
When the switching element 22 a is actuated, an internal switch 36 a is actuated, switching on the electronic unit 20 a . The electronic unit 20 a supplies power to the electronically commutated electric motor 12 a and controls it in a closed-loop and/or open-loop manner. The switching element 22 a and the electronic unit 20 a are accommodated by the second housing part 34 a . In the exemplary embodiment in FIG. 2 , the switching element 22 a is configured as a switching slide.
However, it is also possible that the switching element 22 a is configured as a dead man's switch, an accelerating switch or an arresting switch.
A switching system may comprise at least a sliding switch, a dead man's switch, an accelerating switch and an arresting switch.
FIGS. 5 and 5 a show an electronically commutated electric motor 12 of a first construction size. The electronically commutated electric motor 12 has a length l 1 , which lies between 12 and 30 mm, particularly between 15 and 25 mm, but with preference between 18 and 24 mm. The electronically commutated electric motor 12 may be used with the length l 1 in the various hand-held power tools 16 a to 16 j . The values for the length l 1 of the electronically commutated electric motor 12 do not take into account any production tolerances occurring in the motor production process.
The electronically commutated electric motor 12 of the first construction size has a diameter d 1 , which lies between 30 and 50 mm, particularly between 35 and 44 mm, but with preference is 38 mm. The electronically commutated electric motor 12 may be used with the diameter d 1 in the various hand-held power tools 16 a to 16 j . The values for the diameter d 1 of the electronically commutated electric motor 12 a do not take into account any production tolerances occurring in the motor production process.
FIGS. 6 and 6 a show an electronically commutated electric motor 12 of a second construction size. The electronically commutated electric motor 12 has a length l 2 , which lies between 10 and 30 mm, particularly between 15 and 25 mm, but with preference is 20 mm. The electronically commutated electric motor 12 may be used with the length l 2 in the various hand-held power tools 16 a to 16 j . The values for the length l 2 of the electronically commutated electric motor 12 do not take into account any production tolerances occurring in the motor production process.
The electronically commutated electric motor 12 of the second construction size has a diameter d 2 , which lies between 30 and 50 mm, particularly between 35 and 45 mm, but with preference is 44 mm. The electronically commutated electric motor 12 can be used with the diameter d 2 in the various hand-held power tools 16 a to 16 j . The values for the diameter d 2 of the electronically commutated electric motor 12 do not take into account any production tolerances occurring in the motor production process.
FIGS. 7 and 7 a show an electronically commutated electric motor 12 of a third construction size. The electronically commutated electric motor 12 has a length l 3 , which lies between 10 and 35 mm, particularly between 15 and 30 mm, but with preference is 26 mm. The electronically commutated electric motor 12 may be used with the length l 3 in the various hand-held power tools 16 a to 16 j . The values for the length l 3 of the electronically commutated electric motor 12 do not take into account any production tolerances occurring in the motor production process.
The electronically commutated electric motor 12 of the third construction size has a diameter d 3 , which lies between 40 and 60 mm, particularly between 45 and 55 mm, but with preference is 50 mm. The electronically commutated electric motor 12 can be used with the diameter d 3 in the various hand-held power tools 16 a to 16 j . The values for the diameter d 3 of the electronically commutated electric motor 12 do not take into account any production tolerances occurring in the motor production process.
In FIGS. 5, 5 a , 6 , 6 a , 7 and 7 a , the electronically commutated electric motors are configured as internal-rotor motors. In the case of motors of this type, a stator, which bears the current-carrying windings, is located on the motor housing. A rotor, which bears the permanent magnets, is connected to the output shaft. The advantages of the internal-rotor motor are a high achievable rotational speed along with a high power density.
FIG. 8 shows a section through an external-rotor motor. In the case of motors of this type, the stator 42 , which bears the windings 44 , is enclosed by the rotor 46 . The magnetic field is generated by permanent magnets 48 , which are arranged in the rotor 46 . The rotor 46 is usually fastened to the output shaft 32 , while the stator 42 is arranged on a stator support. Possible advantages of these motors are the high achievable torques. The external-rotor motor 12 may have the lengths l 1 to l 3 . The external-rotor motor 12 may have the diameters d 1 to d 3 .
For a required commutation, the angular position of the permanent magnet 48 in the rotor 46 is ascertained by way of one or more sensors 50 and evaluated by the electronic unit. On the basis of the angular position of the rotor 46 and the desired direction of rotation, the corresponding windings 44 are supplied with power by the electronic unit in order to produce the required torque. However, it is also conceivable that the commutation takes place without a sensor, by ascertaining a counter voltage triggered in the windings of the stator.
Furthermore, a sensor device may be provided for detecting a kickback and/or incorrect mounting of the machining tool and/or a rupturing of the machining tool during the operation of the hand-held power tool 16 a to 16 j and/or a fall of a hand-held power tool 16 a to 16 j.
Since in the case of hand-held power tools 10 a to 10 j with electronically commutated electric motors 12 a to 12 j the electronic units 20 a to 20 j are always designed to be more powerful and larger in terms of size and volume than in the case of brushed motors, the cooling plays an ever more important role and results in the necessity for optimum cooling. The cooling may be a passive or active configuration. In the case of passive cooling, the transporting away of the thermal energy takes place by convection. In the case of active cooling, the thermal energy of the component to be cooled is transported away with the aid of a cooling system.
In the exemplary embodiment in FIG. 2 , the cooling system is a fan 52 a . The fan 52 a is attached to the output shaft 32 a and is arranged between the electronically commutated electric motor 12 a and the machining tool 25 a . However, it is also conceivable that the fan 52 a is not attached to the output shaft 32 a , but is connected to the output shaft 32 a by way of elements such as belts or toothed wheels. It is equally conceivable that other cooling systems, such as Peltier elements, heat sinks, additional actuators with air ducting elements or the like are used.
The electronic unit 20 a is connected to the electronically commutated electric motor 12 a . The electronic unit 20 a monitors at least one of the parameters concerning the electronically commutated electric motor 12 a . The parameter concerning the electronically commutated electric motor 12 a is intended to be understood as meaning at least one of the following parameters of the electronically commutated electric motor 12 a : a load moment, an overload moment, a rotational speed, a current, an armature voltage and/or a temperature of the electronically commutated electric motor 12 a . The load moment describes a moment that is produced by a workpiece as a counter moment to a drive moment. A rise in the load moment when operation is in progress leads to be drop in the rotational speed. A drop in the rotational speed increases the current and/or voltage consumed by the electronically commutated electric motor 12 a and thereby reduces the cooling effect of the fan 52 a , so that the temperature measured in the electronically commutated electric motor 12 a rises. Accordingly, at least one of the following parameters can be monitored: an overshooting of the overload moment, an undershooting of a limit value of the rotational speed, an overshooting of a limit value of the current, an overshooting of a limit value of the armature voltage and/or an overshooting of a limit value of the temperature. One or more parameters can be monitored in parallel. The overload moment is intended to be understood as meaning the moment which when overshot has the effect that the temperature increase becomes critical for the components of the electronically commutated electric motor 12 a , i.e. destruction of the electronically commutated electric motor 12 a can no longer be ruled out. By means of a setpoint-value/actual-value comparison of at least one value of the parameter, the electronic unit 20 a calculates at least one activation signal for the electronically commutated electric motor 12 a.
Furthermore, the electronic unit 20 a is connected to the internal switch 36 a . In this case, the electronic unit 20 a monitors at least one of the parameters concerning the internal switch 36 a . The parameter is intended to be understood as meaning at least the following parameter: a short-circuit current that flows by way of a switching contact 37 a . The switching contact 37 a is located between the internal switch 36 a and the electronic unit 20 a.
By means of a setpoint-value/actual-value comparison of at least one value of the parameter, the electronic unit 20 a calculates at least one activation signal for the electronically commutated electric motor 12 a.
Furthermore, the electronic unit 20 a is connected to the rechargeable battery 14 . The electronic unit 20 a monitors at least one parameter concerning the rechargeable battery 14 . The parameter is intended to be understood as meaning at least one of the following parameters of the rechargeable battery 14 : a capacity of the rechargeable battery 14 and/or an overload state of the rechargeable battery 14 .
By means of a setpoint-value/actual-value comparison of the value of the parameter, the electronic unit 20 a calculates at least one activation signal for the electronically commutated electric motor 12 a.
The battery voltage lies in a range between 3.6 and 42 V, particularly between 7.2 and 14.4 V, but is preferably 10.8 V. The battery voltage values are in this case nominal voltage values of the battery voltage and do not take into account possible battery voltage fluctuations. The nominal voltage of a battery is given by the number of cells connected in series. The nominal voltage of the rechargeable battery 14 is not the same as the open-circuit voltage of the rechargeable battery 14 .
The rechargeable battery 14 consists in particular of lithium-ion battery cells. The rechargeable battery 14 in this case comprises one or more rows of battery cells, which in turn are connected in parallel with one another. Each individual cell has a length of approximately 65 mm and a diameter of approximately 18 mm. However, it is also conceivable that a cell has a length of 65 to 70 mm and a diameter of 14 to approximately 20 mm. The figures given do not take into account possible production tolerances. Lithium-ion storage batteries are distinguished by a high energy density and thermal stability even under high loads, which means they produce high power. Another great advantage is the low self-discharge, which has the effect that the storage batteries are also ready for use even after lengthy periods of non-use. These advantages give rise to the advantages of the hand-held power tools 16 a to 16 j according to the invention, in particular the compactness of the hand-held power tools 16 a to 16 j together with a high power output capacity.
However, it is also conceivable that the rechargeable battery 14 consists of lithium-air cells, lithium-sulfur cells, lithium-polymer cells or the like. Furthermore, the rechargeable battery 14 may be realized in a geometrical configuration other than that shown, such as for example an angular configuration.
In one exemplary embodiment, the hand-held power tool 16 a to 16 j can be operated both in an eco mode and in a boost mode.
In eco mode, the electronically commutated electric motor 12 a to 12 j of the hand-held power tools 16 a to 16 j is operated at the optimum operating point.
In boost mode, the electronically commutated electric motor 12 a to 12 j is operated particularly powerfully. In this mode, the power peak of the electronically commutated electric motor 12 a to 12 j is between 10% and 100%, particularly between 20% and 50%, but with preference at 33% of the nominal power. The time limitation of the boost mode lies between 0 and 5 min, particularly between 0 and 2.5 min. With preference, the time limitation of the boost mode lies between 30 s and 1 min.
In FIG. 9 , a second embodiment of the first hand-held power tool 16 a is represented. Arranged on the first housing part 30 a of the hand-held power tool 16 a is a lighting device 56 a . The lighting device 56 a may however also be arranged on the second housing part 34 a . The lighting device 56 a may illuminate a work area, but also project optical information onto a workpiece and/or a surrounding area. The lighting device 56 a may consist both of individual lighting means and of multiple lighting means and have for example a single LED and multiple LEDs. The lighting means may be provided in various construction forms and sizes. The lighting device 56 a may however also be configured as a spot light source. However, it is also conceivable that the lighting device 56 a is configured as a projection device. The lighting device 56 a may have lighting elements, which may be arranged in various ways on the first housing part 30 a and/or on the second housing part 34 a.
The lighting device 56 a may be formed as a closed luminous ring. The emitted light may have different colors. The light emitted by the luminous ring may vary in brightness. The light emitted by the luminous ring may be a flashing light, which changes brightness periodically. The luminous ring may be connected to the first housing part 30 a and/or the second housing part 34 a by adhesive bonding, locking engagement, clamping, clipping or the like.
The lighting device 56 a may be formed as a running light. The light emitted by the running light may have different colors. The light emitted by the running light may vary in brightness. The running light may be connected to the first housing part 30 a and/or the second housing part 34 a by adhesive bonding, locking engagement, clamping, clipping or the like.
Furthermore, the lighting device 56 a in FIG. 9 is provided for providing the operator of the hand-held power tool 16 a with an indication concerning the parameters of the hand-held power tool 16 a . The parameters associated with the hand-held power tool 16 a are at least the following:
A capacity of the rechargeable battery 14 An overload state of the hand-held power tool 16 a , in particular of the electronically commutated electric motor 12 a , of the electronics 20 a and/or of the rechargeable battery 14 A rotational speed of the electronically commutated electric motor 12 a A current, a voltage and/or a temperature of the electronically commutated electric motor 12 a A temperature of the electronically commutated electric motor 12 a and/or of the electronics 20 a

The indication of the parameters of the hand-held power tool 16 a may be realized for example by the following indicating possibilities:
A change in the color of the light A change in the intensity of the light Light pulses of differing length Light pulses of differing brightness Running light with change in the running direction of the light Light pulses, varying in pulse frequency and/or brightness

Further indications of the parameters of the hand-held power tool 16 a that appear appropriate to a person skilled in the art are also possible.
FIG. 10 shows a further embodiment of the hand-held power tool 16 a according to the invention. The hand-held power tool 16 a is provided with an interface 58 a , which is provided for making possible a data exchange, in particular an electronic data exchange, between the hand-held power tool 16 a , in particular the electronics 20 a of the hand-held power tool 16 a , and an external communication and/or data processing unit 60 . The data exchange between the electronics 20 a and the external communication and/or data processing unit 60 takes place with preference in a cableless manner, for example with the aid of a Bluetooth connection, Bluetooth Low Energy, a WLAN connection, an NFC connection, an infrared connection or the like. The electronics 20 a controls the electronically commutated electric motor 12 a in an open-loop and/or closed-loop manner, with preference in dependence on the parameters of the hand-held power tool 16 a.
The external communication and/or data processing unit is preferably formed as a smart interface, for example as a smart phone, which has an app for communication with the interface 58 a . However, it is also conceivable that the external communication and/or data processing unit 60 is formed as an external, transportable communication and/or data processing unit, as a fixedly installed communication and/or data processing unit or some other centralized or decentralized communication and/or data processing unit that appears appropriate to a person skilled in the art. A synchronization of electronic data can consequently be advantageously made possible. Settings stored in the external communication and/or data processing unit 60 , such as for example a set rotational speed, maximum power or the like, may for example be transmitted directly to the hand-held power tool 16 a.
In FIG. 11 , the hand-held power tool 16 c is formed as a straight grinder 16 c . A second housing part 34 c is formed as a handle. In a further embodiment, the housing part 34 c may also be formed as a cup housing. However, it is also conceivable that the first housing 34 c consists of a further housing part, for example a cover.
Arranged in the housing part 34 c is the electronically commutated electric motor 12 c . The electronically commutated electric motor 12 is arranged between a rechargeable battery 14 and a tool holder 64 c . The electronically commutated electric motor 12 c may be actively braked by way of a brake, in particular by way of an electronic brake. The electronics 14 c are likewise arranged in the housing part 34 c . The electronics 20 c supply power to the electronically commutated electric motor 12 c . The rechargeable battery 14 serves as an energy source for the electronically commutated electric motor 12 c . The electronically commutated electric motor 12 c drives a tool spindle. The tool holder 64 c serves for receiving a machining tool that is not represented any more specifically for the straight grinder 16 c . The tool holder 24 c is formed as a collet. The machining tool may be a milling, polishing, grinding or similar element that is not represented any more specifically.
The tool holder 64 c has a diameter d, which lies between 4.0 and 8.0 mm. With preference, the diameter d is 6.0 mm. The figure given does not take into account any production tolerances.
In FIG. 11 a , the straight grinder 16 c according to the invention is schematically represented in a partial view.
As evident in FIG. 11 a , the electronically commutated electric motor 12 c is an internal-rotor motor. The electronically commutated electric motor 12 c may be the electronically commutated electric motor that is shown in FIG. 5 .
The rotational speed, which can be measured at the tool spindle, is set by way of an adjusting element 70 c . In the exemplary embodiment, the nominal rotational speed at the tool spindle is at least 15 000 rpm. The rotational speed can be increased up to 50 000 rpm.
A fan 52 c is integrated in the second housing part 34 c . It is particularly advantageous if the fan 52 c is integrated between the electronically commutated electric motor 12 and the tool holder 64 c . The fan 52 c may however also be arranged between the electronically commutated electric motor 12 and the electronics 20 c . It is equally conceivable to dispense with the fan 52 c and realize the cooling for example by way of intelligently arranged cooling ribs and/or heat sinks.
As evident in FIG. 11 , four air outlet openings 72 c have been introduced into an annular housing wall 68 c . It is equally conceivable that fewer than or more than four air outlet openings 72 c are introduced into the annular housing wall 68 c.
Air inlet openings 74 c have been introduced into the second housing part 34 c . A cooling flow is produced by the fan 52 c and passes from the air inlet openings 74 c to the air outlet openings 72 c.
In the exemplary embodiment, the rechargeable battery 14 is connected on a rear side 75 c , facing away from the tool holder 64 c , of the straight grinder 16 c . The battery voltage lies in a range between 3.6 and 42 V, particularly between 7.2 and 14.4 V, but with preference is 10.8 V. The values of the battery voltage do not take into account possible battery voltage fluctuations. The rechargeable battery 14 is connected here to the straight grinder 10 c in such a way that a large part of the rechargeable battery 14 in the housing lies within the straight grinder 16 c , and consequently contributes to a compact type of construction.
It is also possible by activating a switching element to activate a blocking device in order to arrest a tool spindle. The blocking device may be configured as a slide, pin or lever. The arresting of the spindle may take place by interlocking and/or frictional engagement. It is in this case conceivable that elements, such as for example locking or friction disks, are provided on the drive shaft 32 c . The blocking device may be configured as a separate component. However, it is also conceivable that the blocking device is integrated in an existing component or is combined with it. Such a component may be a switching element, an adjusting element or the like. The arresting of the spindle may take place automatically. However, it is also conceivable that the arresting of the spindle can be actuated manually.
In FIG. 12 , the second hand-held power tool 16 b , formed as an eccentric grinder 16 b , is shown in a schematic representation. Arranged in the first housing part 30 b is the electronically commutated electric motor 12 b . The electronically commutated electric motor 12 b is connected to the output shaft 32 b . The output shaft 32 b is connected by way of an eccentrically arranged bearing to a bearing shaft, which bears the machining tool 25 b . In the exemplary embodiment, the machining tool 25 b of the hand-held power tool 16 b is a grinding wheel, on the underside of which a grinding means can be fastened for the surface machining of a workpiece. The machining tool 25 b of the hand-held power tool 16 b has a diameter d b , which lies between 75 and 150 mm, but preferably between 115 and 125 mm. The bearing may be configured as a ball bearing and makes it possible for the bearing shaft to rotate itself about an axis of rotation that at the same time represents the rotational axis of the machining tool 25 b . The rotational axis of the bearing shaft lies at an eccentric distance parallel to an axis of rotation 78 b of the output shaft 32 b.
The second housing part 34 b is formed as a handle 76 b or serves for an operator of the hand-held power tool 16 b as a handle. The first housing part 30 b and the handle 76 b are arranged at an angle in relation to one another. With preference, the first housing part 30 b and the handle 76 b are at an angle of approximately 90° to one another. The figure given for the angle does not take into account any production tolerances.
Arranged in the second housing part 34 b are the electronics 20 b . The electronics 20 b are provided for supplying the electronically commutated electric motor 12 b with electrical energy. In the exemplary embodiment, the electronics 20 b are arranged in the second housing part 34 b . However, it is also conceivable that the electronics 20 b are for example integrated in the electronically commutated electric motor 12 b or configured separately.
In order to achieve guidance of the hand-held power tool 16 b that can be handled particularly easily, it is of advantage to arrange a second gripping region 80 b on the first housing part 30 b . The second gripping region 80 b is formed in particular as a knob, which also from a visual aspect provides a pleasing appearance. The second gripping region 80 b is designed in such a way that it lies particularly ergonomically in the hand of the operator.
The electronically commutated electric motor 12 b drives the bearing shaft in particular directly. “Directly” is intended to be understood as meaning that the electronically commutated electric motor 12 b is connected to the bearing shaft without a conventional gear mechanism, such as for example a planetary-gear, bevel-gear or spur-gear mechanism, in between.
The eccentrically arranged machining tool 25 b of the hand-held power tool 16 b performs an oscillating movement. The stroke thereby produced is twice the eccentric distance between the rotational axis of the bearing shaft and the axis 78 b.
As evident in FIG. 12 , the electronically commutated electric motor 12 b is an internal-rotor motor. The electronically commutated electric motor 12 b may be the electronically commutated electric motor that is shown in FIG. 5 .
A further embodiment according to the invention of the hand-held power tool 16 b is represented in FIG. 12 a . As evident in FIG. 12 a , the electronically commutated electric motor 12 b is an external-rotor motor.
In the exemplary embodiments, the rotational speed is between 3000 rpm and 15 000 rpm, in particular with preference from 8000 rpm to 11 000 rpm. Furthermore, the rotational speed can be reduced by way of an adjusting element.
The fan 52 b is integrated in the first housing part 30 b . In the exemplary embodiment in FIG. 12 , the fan 52 b is integrated between the electronically commutated electric motor 12 and the machining tool 25 b . However, it is also conceivable that other cooling systems, such as Peltier elements, closed cooling circuits or the like, are used. It is equally conceivable to dispense with the fan and to realize the cooling for example by way of intelligently arranged cooling ribs and/or heat sinks.
A dust extraction device 82 b is fastened to the first housing part 30 b . In the machining tool 25 b , bores have been introduced, distributed over the circumference, and are used to suck grinding dust occurring during the machining of the workpiece into the first housing part 30 b with the aid of a dust fan 83 b , the dust fan 83 b being securely connected to the output shaft 32 b . The grinding dust transported through the bores of the machining tool 25 b is directed by way of the dust extraction device 82 b into a dust collecting container that is not represented.
The battery voltage lies in a range between 3.6 and 42 V, in particular between 7.2 and 14.4 V, but with preference is 10.8 V. The values of the battery voltage do not take into account possible battery voltage fluctuations.
In FIG. 13 , the hand-held power tool 16 d is formed as an oscillating multitool 16 d.
Arranged in the first housing part 30 d is an electronically commutated electric motor 12 d , which drives the output shaft 32 d . A tool shaft 84 d bears a tool, which can be driven in an oscillating manner and is not represented any more specifically. The second housing part 34 d adjoins the first housing part 32 d . The first housing part 32 d and the second housing part 34 d may be configured in one piece or as separate component units.
The second housing part 34 d serves for a user of the hand-held power tool 16 d as a handle or is formed as a handle. The second housing part 34 d is also provided for the pushing-in of the rechargeable battery 14 .
In the exemplary embodiment in FIG. 13 , the electronically commutated electric motor 12 d is an internal-rotor motor. The electronically commutated electric motor 12 may be the electronically commutated electric motor that is shown in FIG. 5 .
The output shaft 32 d and the tool shaft 84 d are arranged parallel to one another. The output shaft 32 d and the tool shaft 84 d may however also be arranged at an angle to one another, which lies between −30 and 30°, particularly between −10 and 10°, but with preference between −3.0 and 3.0°. The figure given for the angle does not take into account any possible tolerances in giving the angle.
The rotational movement of the output shaft 32 d is transmitted by way of a coupling/connecting element 86 d to the tool shaft 84 d . The coupling/connecting element 86 d is arranged between the output shaft 32 d and the tool shaft 84 d . With the aid of the coupling/connecting element 86 d , the rotating movement of the output shaft 32 d is transformed into an oscillating pendular movement of the tool shaft 84 d.
The oscillating pendular movement lies in an angular range between 0.4 and 2.5°, particularly between 0.8 and 1.6°, but with preference between 1 and 1.4°. Up to 30 000 pendular movements are performed in one second, but particularly 25 000 pendular movements in one second, but with preference up to 20 000 pendular movements in one second.
As evident from FIG. 13 , on its end side facing the tool, the output shaft 32 d is rotatably accommodated in a first bearing 88 d and, on its side facing away from the tool, it is rotatably accommodated in a second bearing 89 d . On its end side facing the tool, the tool shaft 84 d is rotatably accommodated in a third bearing 90 d and, on its side facing away from the tool, it is rotatably accommodated in a fourth bearing 91 d.
The two bearings 88 d , 90 d are connected to one another in particular by way of a bearing plate 92 d . The bearing plate 92 d is in this case configured as a separate component with respect to the first housing part 30 d . The bearing plate 92 d is made of a metal or composite material, whereby the strength can be increased.
The four bearings 88 d , 89 d , 90 d , 91 d may be configured as a fixed or floating bearing.
The fan 52 d is arranged in the first housing part 30 d . The fan 52 d is attached to the output shaft 32 d and is arranged between the electronically commutated electric motor 12 d and the eccentric element 94 d . However, it is also conceivable that the fan 52 d is not attached to the output shaft 32 d , but is connected to the output shaft 32 d by way of elements such as belts or toothed wheels. It is equally conceivable that other cooling systems, such as Peltier elements, heat sinks, additional actuators with air ducting elements or the like are used.
The rechargeable battery 14 is at least partially arranged on the second housing part 34 d of the hand-held power tool 16 d . In this case, a large part of a battery length l B is integrated in the second housing part 34 d . The pushing-in direction of the rechargeable battery 14 lies here coaxially in relation to the main direction of extent of the second housing part 34 d.
The battery voltage lies in a range between 3.6 and 42 V, in particular between 7.2 and 18 V. With preference, however, the battery voltage is 10.8 V. The values of the battery voltage do not take into account possible battery voltage fluctuations.
An adjusting element 70 d is arranged on a lower side of the second housing part 34 d . The adjusting element 70 d is provided for setting a rotational speed and/or an operating mode, such as for example an eco mode or a boost mode.
A holding element 96 d is likewise arranged on the lower side of the second housing part 34 d . The holding element accommodates a tool 98 d , which is provided for changing a machining tool.
A pressure element 100 d is arranged on the first housing part 30 d and is provided for making it possible for the machining tool to be changed without the use of a tool.
FIG. 14 shows the hand-held power tool 16 e as a router 16 e . The electronically commutated electric motor 12 e is arranged in the first housing part 30 e . The electronically commutated electric motor 12 e is connected to an output shaft 32 e . The output shaft 32 e continues in a tool spindle 102 e . However, it is also conceivable that the output shaft 32 e is connected to the tool spindle 102 e by way of a coupling. However, it is also conceivable that the output shaft 32 e is connected to the tool spindle 102 e by way of a conventional gear mechanism or a belt drive. The tool spindle 102 e bears a tool holder that is not represented any more specifically. The tool holder is for example a collet. A machining tool is inserted in the collet and securely clamped by means of a union nut. The machining tool is for example a milling tool. The router 16 e is for example suitable for milling grooves or for edge milling.
The electronics 20 e are provided inter alia for supplying power to the electronically commutated electric motor 12 e . The electronics 20 e are arranged in the first housing part 30 e.
The electronic unit 20 e evaluates the value of a parameter that characterizes the router 16 e or multiple parameters characterizing the router 16 e.
One or more of the parameters may be measured and evaluated. If an actual value of one of the parameters deviates in an inadmissible way from its setpoint value, in particular an activation signal for a voltage of the electronically commutated electric motor 12 e is chosen in such a way that a power output to the electronically commutated electric motor 12 e is reduced.
In the exemplary embodiment, the electronically commutated electric motor 12 e may be an internal-rotor motor. The electronically commutated electric motor 12 e may be the electronically commutated electric motor that is shown in FIG. 5 .
As evident in FIG. 14 , on its side facing the tool, the output shaft 32 e is rotatably accommodated in a first bearing 88 e and, on its side facing away from the tool, is rotatably accommodated in a second bearing 89 e.
The rechargeable battery 14 is at least partially connected to the first housing part 30 e . In this case, a large part of a battery length l B is integrated in the first housing part 30 e . The pushing-in direction of the rechargeable battery 14 extends along a y direction of the router 16 e.
The battery voltage lies in a range between 3.6 and 42 V, in particular between 7.2 and 18 V. With preference, however, the battery voltage is 10.8 V. The values of the battery voltage do not take into account possible battery voltage fluctuations.
An adjusting device is provided for setting a rotational speed and/or an operating mode, such as for example an eco mode or a boost mode.
The rotational speed of the router 16 e according to the invention lies between 8000 and 35 000 rpm, particularly between 10 000 and 25 000 rpm. With preference, the rotational speed is 20 000 rpm.
Furthermore, the router 16 e can be operated in an automatic mode. In the automatic mode, the rotational speed is automatically controlled in a closed-loop manner in dependence on a parameter that is specific to the machining tool and/or specific to the application.
A parameter that is specific to the machining tool and/or specific to the application is for example an advancing speed, a diameter and/or a geometrical dimension of the machining tool or a material of a machining workpiece.
In the exemplary embodiment in FIG. 14 , the lighting device 56 e is arranged on a second housing part 34 e of the router 16 e . The lighting device 56 e may however also be arranged on the first housing part 30 e . The lighting device 56 e may however also be arranged on the tool holder. The lighting device 56 e may illuminate a work area, but also project optical information onto a surrounding area. The lighting device 56 e may consist both of a single LED and also multiple LEDs. The LEDs may be provided in various construction forms and sizes. The lighting device 56 e may however also be configured as a spot light source. However, it is also conceivable that the lighting device 56 e is configured as a projection device. The lighting device 56 e may have lighting elements, which may be arranged in various ways on the first housing part 30 e and/or on the second housing part 34 e.
The fan 52 e is attached to the output shaft 32 e and is arranged between the electronically commutated electric motor 12 e and the tool spindle 102 e . However, it is also conceivable that the fan 52 e is not attached to the output shaft 32 e , but is connected to the output shaft 32 e by way of elements such as belts or toothed wheels. It is equally conceivable that other cooling systems, such as Peltier elements, heat sinks, additional actuators with air ducting elements or the like are used.
FIG. 15 shows a hand-held power tool 16 f formed as an electric scraper 16 f for machining surfaces by scraping. The electric scraper 16 f has an electronically commutated electric motor 12 f , which is arranged in the first housing part 30 f and is provided for driving the machining tool 25 f . The machining tool 25 f may be a scraper, spreader, blade or the like. The electronically commutated electric motor 12 f is connected to an output shaft 32 f . The output shaft 32 f bears an eccentric element 94 f . Mounted on the eccentric element 94 f , as represented in FIG. 15 a , is a ball bearing 104 f . One end of the eccentric element 94 f that is facing the machining tool 25 f engages in a through-opening 106 f of a driving element 108 f.
As evident in FIG. 15 a , a disk 110 f and a spring element 112 f are arranged between the driving element 108 f and the ball bearing 104 f . A closure element 114 f closes a lower opening 116 f of the first housing part 30 f . When the closure element 114 f is actuated, the machining tool 25 f of the electric scraper 16 f can be removed. With a lug 118 f , the driving element 108 f engages in a clearance 120 f in a clamped end of a shank 122 f of the machining tool 25 f . As soon as the output shaft 32 f rotates, the eccentric element 94 f circulates about its axis of rotation, with the driving element 108 f following it.
It is also shown in FIG. 15 a that the machining tool 25 f is guided in a longitudinal guide 124 f . The longitudinal guide 124 f is formed in such a way that it reaches around the shank 122 f of the machining tool 25 f . The longitudinal guide 124 f is provided with a rectangular guiding slot 126 f extending right through it. The shank 122 f of the machining tool 25 f passes through the guiding slot 126 f . A sealing element 128 f closes a front opening of the first housing part 30 f . The shank 122 f of the machining tool 25 f passes through the front opening of the first housing part 30 f.
The spring element 112 f , the disk 110 f , the driving element 108 f , the closure element 114 f , the machining tool 25 f , the longitudinal guide 124 f and the sealing element 128 f are shown in FIG. 15 a in an exploded representation.
In the exemplary embodiment, the electronically commutated electric motor 12 f is an internal-rotor motor. The electronically commutated electric motor 12 f may be the electronically commutated electric motor that is shown in FIG. 6 .
The rechargeable battery 14 is at least partially connected to the second housing part 34 f . In this case, a large part of a battery length l B is integrated in the second housing part 34 f and forms with it a common axis, which lies coaxially in relation to the pushing-in direction of the rechargeable battery 14 .
The battery voltage lies in a range between 3.6 and 42 V, in particular between 7.2 and 18 V. With preference, however, the battery voltage is 10.8 V. The values of the battery voltage do not take into account possible battery voltage fluctuations.
The second housing part 34 f serves for a user of the electric scraper 16 f as a handle or is formed as a handle.
The fan 52 f is attached to the output shaft 32 f and is arranged between the electronically commutated electric motor 12 f and the eccentric element 94 f . However, it is also conceivable that the fan 52 f is not attached to the output shaft 32 f , but is connected to the output shaft 32 f by way of elements such as belts or toothed wheels. It is equally conceivable that other cooling systems, such as Peltier elements, heat sinks, additional actuators with air ducting elements or the like are used.
FIG. 15 b shows an embodiment of an electric scraper 16 f with a device 130 f for adjusting and/or fixing a height h. The device 130 f is arranged on the first housing part 34 f . The height h here is the distance between a working end 132 f of the machining tool 25 f and an imaginary extension line, which runs along a lower housing wall 134 f of the first housing part 30 f in the x direction of the electric scraper 16 f . The machining tool 25 f is guided and fixed with respect to the height h, so that the machining tool 25 f can penetrate into a work material, while limited to a predetermined cutting depth. The device 130 f comprises at least one first height adjusting means 136 f and a second height adjusting means 138 f . The height adjusting means 136 f , 138 f can be adjusted and fixed by means of at least one height-adjustable fastening means 140 f . The first height adjusting means 136 f and the second height adjusting means 138 f are connected to one another by way of an axis 142 f . A reading unit 144 f serves for indicating the cutting depth to the operator of the electric scraper 16 f.
As evident in FIG. 16 , the handheld power tool 16 g is formed as a jigsaw 16 g.
As evident in FIG. 17 , the handheld power tool 16 h is formed as a circular saw 16 h.
As evident in FIG. 18 , the handheld power tool 16 i is formed as a riveter 16 i.
As evident in FIG. 19 , the handheld power tool 16 j is formed as a roller sander 16 j.