Hand-held power tool with a sensor circuit board

Abstract

In a hand-held power tool (100), the hand-held power tool has a tool receptacle (140) and a housing (105) in which at least one electronically commutated drive motor (185) for driving an insert tool that can be arranged in the tool receptacle (140) is arranged, and a sensor circuit board (160) arranged in the housing (105), on which a sensor element (252) is arranged in order to enable sensor-controlled commutation of the electronically commutated drive motor (185), at least one bearing element (255) being provided for bearing the sensor circuit board (160) in the housing (105) and for arranging the sensor circuit board (160) on the electronically commutated drive motor (185), wherein the sensor circuit board (160) is mechanically decoupled from the electronically commutated drive motor (185).

Description

TECHNICAL FIELD

[0001] The invention relates to a hand-held power tool having a tool receptacle and a housing, in which at least one electronically commutated drive motor for driving an insert tool which can be arranged in the tool receptacle is arranged, and a sensor circuit board which is arranged in the housing and on which sensor elements are arranged in order to enable sensor-controlled commutation of the electronically commutated drive motor. BACKGROUND

[0002] It is known from the prior art to configure a hand-held power tool as a screwdriver machine which has an electronically commutated drive motor for driving an insert tool which can be arranged in the tool receptacle in the housing. The electronically commutated drive motor is commutated in a sensor-controlled manner, for which a sensor circuit board having sensor elements, preferably Hall sensors, is provided. The sensor circuit board is mechanically arranged or fixed on the electronically commutated drive motor. SUMMARY

[0003] The invention relates to a hand-held power tool having a tool receptacle and a housing, in which at least one electronically commutated drive motor for driving an insert tool which can be arranged in the tool receptacle is arranged, and a sensor circuit board which is arranged in the housing and on which sensor elements are arranged in order to enable sensor-controlled commutation of the electronically commutated drive motor. At least one support element is provided for supporting the sensor circuit board in the housing and for arranging the sensor circuit board on the electronically commutated drive motor, wherein the sensor circuit board is mechanically decoupled from the electronically commutated drive motor.

[0004] The invention thus makes it possible to provide a hand-held power tool in which, by means of at least one support element, a simplified and stable arrangement of the sensor circuit board in the housing of the hand-held power tool can be achieved. Furthermore, by means of the at least one support element, a compact arrangement of the drive motor and the sensor circuit board can be achieved.

[0005] In one configuration of the at least one support element, the at least one support element has a receptacle for at least section-wise receiving the sensor circuit board.

[0006] Preferably, the at least one support element is arranged on the housing. A mechanical decoupling from the drive motor can thus be achieved in a simple manner.

[0007] Alternatively or additionally, the at least one support element is arranged on the sensor circuit board. In order to support the support element in the housing of the hand-held power tool, a receptacle is provided in the housing which receives the support element.

[0008] In one embodiment, the at least one support element is fixed on the sensor circuit board by means of injection molding. A secure and robust arrangement of the at least one support element can thus be achieved.

[0009] According to one embodiment, the ventilation device is arranged in the housing, wherein the ventilation device is positioned on an end of the electronically commutated drive motor which faces the tool receptacle. A cooling of the hand-held power tool, for example of the transmission and / or the percussion mechanism, can thus be achieved easily and without complexity.

[0010] According to one alternative embodiment, the ventilation device is arranged in the housing, wherein the ventilation device is positioned on an end of the electronically commutated drive motor which faces away from the tool receptacle. A cooling of the hand-held power tool, for example of the drive motor, can thus be achieved easily and without complexity.

[0011] Preferably, the sensor circuit board is arranged between the ventilation device and the electronically commutated drive motor. A suitable wiring and / or cooling can thus be achieved in a simple manner. The sensor circuit board and the ventilation device can here be positioned on an end of the electronically commutated drive motor which faces away from the tool receptacle. An anchor bearing for supporting the drive shaft can here be positioned such that the sensor circuit board is arranged between the anchor bearing and the ventilation device on an end of the electronically commutated drive motor which faces away from the tool receptacle. Alternatively, the sensor circuit board and the ventilation device can here be positioned on an end of the electronically commutated drive motor which faces the tool receptacle.

[0012] The sensor circuit board preferably has a U-shaped base body. A U-shaped base body is also understood within the scope of the present application as an open shape of the base body which deviates from the U-shape, for example a C-shaped, arcuate or semicircular base body. An easy and uncomplicated assembly of the sensor circuit board can thus be achieved, wherein the assembly of the sensor circuit board can take place after the assembly of the drive motor.

[0013] Alternatively, the sensor circuit board has a circular base body. A circular base body is also understood within the scope of the present application as a closed shape of the base body which deviates from the circle, for example an oval or elliptical base body. A circular base body provides for example more area for the placement of sensors and other electronic components on the sensor circuit board.

[0014] According to a further embodiment, the sensor circuit board is positioned on an end of the electronically commutated drive motor which faces away from the tool receptacle. Here, the ventilation device can be positioned on an end of the electronically commutated drive motor which faces the tool receptacle. An anchor bearing for supporting the drive shaft can be positioned such that the sensor circuit board is arranged between the anchor bearing and the end of the electronically commutated drive motor which faces away from the tool receptacle. A further suitable arrangement of the sensor circuit board can thus be achieved easily and without complexity.

[0015] Preferably, the sensor element has a Hall sensor. A reliable and cost-advantageous sensor element can thus be provided.

[0016] The sensor circuit board is preferably electrically connected with an electronic unit which is assigned to the electronically commutated drive motor. A sensor circuit board which can be simply assembled can thus be provided, since a plug connection for the connection with the electronic unit can be dispensed with.

[0017] A power supply unit for supplying the electronically commutated drive motor with electrical energy is provided, which power supply unit is preferably configured as a battery pack. A suitable power supply can thus be provided in a simple manner.

[0018] According to one embodiment, the hand-held power tool is configured as a rotary hammer drill. A suitable hand-held power tool using a sensor circuit board can thus be easily and non-complexly provided. BRIEF DESCRIPTION OF DRAWINGS

[0019] The application is further explained in the following description in view of the embodiments shown in the drawings. The drawings show:

[0020] Figure 1 A side view of a hand-held power tool according to the application;

[0021] Figure 2 Figure 1 A partial longitudinal section of a hand-held power tool for illustrating an arrangement of a sensor circuit board assigned to the hand-held power tool;

[0022] Figure 3 A top view of a sensor circuit board arranged in a housing of a hand-held power tool from a second axial end of the hand-held power tool; and

[0023] Figure 4 Figure 1 A partial section of a hand-held power tool for illustrating a further arrangement of a sensor circuit board assigned to the hand-held power tool. DETAILED DESCRIPTION

[0024] Figure 1 An exemplary hand-held power tool 100 is shown, which has a housing 105 with a handle 115. According to one embodiment, the hand-held power tool 100 can be mechanically and electrically connected with a power supply unit 190 for a power supply independent of a power grid.

[0025] A drive unit 127 is preferably arranged in the housing 105, which drive unit has a first axial end 101 and an opposite second axial end 102. The drive unit 127 has at least one transmission unit 125 and an electric drive motor 180.

[0026] Preferably, the energy supply unit 190 is provided for energizing the drive motor 180 of the hand-held power tool 100. Preferably, the energy supply unit 190 is configured as a battery pack. Alternatively or additionally thereto, the hand-held power tool 100 can also be operated network- dependently.

[0027] The drive motor 180 is preferably configured as an electronically commutated drive motor 185. To this end, the drive motor 180 is equipped with a sensor circuit board 160 having sensor elements (252 in Figure 2 ) for sensor-controlled commutation. The sensor circuit board 160 is preferably mechanically decoupled from the electronically commutated drive motor 185. The drive motor 180 or the drive shaft 215 (of the drive motor 180) is supported in the housing 105 by an anchor bearing 217. Figure 2

[0028] The drive motor 180 can be switched on and off, for example, by means of a manual switch 195. Furthermore, the hand-held power tool 100 is provided on the second axial end 102 with a tool receptacle 140 for receiving a plug-in tool, for example a screwdriver bit, a drill bit, etc. The drive motor 180 is preferably configured for driving the tool receptacle 140 and thus the plug-in tool.

[0029] Preferably, the transmission unit 125 is arranged facing the second axial end 102, and the drive motor 180 is arranged facing the first axial end 101. Preferably, the transmission unit 125 is equipped with at least one transmission 120.

[0030] The hand-held power tool 100 is configured, for example, as a rotary impact screwdriver having an impact mechanism 150. The impact mechanism 150 is assigned to the transmission unit 125. It is pointed out here that the application is not limited to a rotary impact screwdriver, but can also be used in different hand-held power tools having a sensor-controlled drive motor, for example in the case of a battery-powered drill-screwdriver.

[0031] Furthermore, a ventilation device 130 is preferably provided. The ventilation device 130 is located, for example and illustratively, on the first axial end 101 of the electronically commutated drive motor 185 or on the end 201 facing away from the tool receptacle 140. However, the ventilation device 130 can also be arranged at any other position in the housing 105. The ventilation device 130 can be arranged, for example, on the end 202 of the electronically commutated drive motor 185 facing the tool receptacle 140 or the second axial end 102, for example as shown in Figure 2 and 4 Preferably, the sensor circuit board 160 is arranged between the ventilation device 130 and the drive motor 180, as shown in Figure 1 and 4 ​The handheld power tool 100 can also be configured without the ventilation device 130, as is shown in

[0032] Furthermore, the handheld power tool 100 has an electronics unit 187. Preferably, the electronics unit 187 is assigned to the drive motor 180. According to one embodiment, the electronics unit 187 is configured as a main electronics to which the signals of the drive motor 180 and of the sensor circuit board 160 are transmitted. Preferably, the sensor circuit board 160 is electrically connected to the electronics unit 187, wherein the electrical connection can be configured by means of soldered lines and / or plug connections.

[0033] Figure 2 The drive unit 127 is shown Figure 1 with a drive motor 180, a transmission unit 125 and a sensor circuit board 160. Here, Figure 2 The drive motor 180, which is configured as an electronically commutated drive motor 185, is supported in the housing 105 by means of a drive shaft 215 and has a stator 211 and a rotor 212. The support of the drive shaft 215 in the housing 105 is realized in the region of the first axial end 101 by means of an anchor bearing 217 in the embodiment shown. The anchor bearing 217 is positioned on the end 201 of the electronically commutated drive motor 185 which faces away from the tool receptacle 140.

[0034] Alternatively or additionally, the drive shaft 215 can also be supported in a transmission flange which is assigned to the transmission unit 125. Such an electronically commutated drive motor 185 is sufficiently known from the prior art, so that a further description is dispensed with here.

[0035] In Figure 2 , the ventilation device 130 is exemplarily arranged on the side of the drive motor 180 and of the transmission unit 125 which faces the second axial end 102 or in other words the driven side. The ventilation device 130 is positioned on the end 202 of the electronically commutated drive motor 185 which faces the tool receptacle 140. However, the ventilation device 130 can also be arranged on the side of the drive motor 180 which faces the first axial end 101 of the drive unit 127, as is schematically shown in Figure 1 . Here, the ventilation device 130 is preferably arranged or in other words supported on the drive shaft 215.

[0036] In Figure 2In the embodiment shown, the sensor circuit board 160 is positioned on the end 201 of the electronically commutated drive motor 185 facing away from the tool receptacle 140. The sensor circuit board 160 is positioned on the end 201 of the electronically commutated drive motor 185 facing away from the tool receptacle 140 between the anchor bearing 217 and the electronically commutated drive motor 185. Preferably, at least one support element 255 is provided for supporting the sensor circuit board 160 in the housing 105 and for arranging the sensor circuit board 160 on the electronically commutated drive motor 185. The at least one support element 255 is preferably configured as an intermediate element between the housing 105 and the sensor circuit board 160.

[0037] The at least one support element 255 is preferably arranged on a housing shell or housing half forming the housing 105. However, it is pointed out here that the housing 105 can also have a cover, preferably on the first axial end 101 or on the left end shown in the embodiment. The cover is preferably fixable on the housing half, for example by clamping and / or screw connection. In this case, the drive shaft 215 can be connected or supported on the rotor 212, also on the cover. According to a further embodiment, the sensor circuit board 160 can be arranged on the cover and thus supported in the housing 105 by means of the at least one support element 255. Figure 2

[0038] The sensor circuit board 160 is mechanically decoupled from the electronically commutated drive motor 185, i.e. the sensor circuit board 160 is not axially fixed on the stator 211 of the drive motor 185 as in the prior art, but is mechanically fixed in the housing 105 independently of the stator. Here, the sensor circuit board 160 is mechanically decoupled from the drive motor 185, in particular the stator 211, but is positioned on the stator 211.

[0039] It is pointed out here that, by means of the mechanical decoupling of the sensor circuit board 160 from the drive motor 180, the drive motor 180 can also be operated without the sensor circuit board 160, i.e. the drive motor can be operated as a sensorless commutated drive motor. Furthermore, a sensorless commutated drive motor can be retrofitted by means of a sensor circuit board 160 that is electronically decoupled and can be configured as a sensor-controlled commutated drive motor. Furthermore, the sensor circuit board 160 is simplified by the decoupling, for example for replacement in the event of a fault of the sensor element 252.

[0040] According to one embodiment, the at least one support element 255 is fixed on the housing 105. Preferably, the at least one support element 255 has a receptacle 257 for receiving the sensor circuit board 160 at least sectionally. A point-like support or a surface-like support is preferably configured.

[0041] ​Preferably, the sensor circuit board 160 can be positioned in the housing 105 with support points by means of the support elements 255, wherein a so-called single-point or single-sided support is preferably configured. It is also possible to provide a two-point or two-sided support, as shown for example in Figure 3 , or a support with more than two points or sides, for example a three-point support, a three-sided support, a four-point support or a four-sided support, etc. Furthermore, the support elements 255 can also be configured in the shape of a C, wherein the sensor circuit board 160 is supported in the housing 105 by means of a predefined region, and wherein, for example, a tongue-and-groove connection is formed between the support elements 255 and the sensor circuit board 160.

[0042] Here, the support elements 255 are fixedly fastened in the interior space of the housing 105, for example by means of a force-locking connection, a form-locking connection and / or a material-locking connection. Furthermore, the support elements 255 can also be configured integrally with the housing 105.

[0043] According to an alternative arrangement, the at least one support element 255 is fixed or injection-molded on the sensor circuit board 160 by means of injection molding. This can be achieved, for example, as in plugs and / or couplings with shapes that belong to one another. Here, the at least one support element 255 has a receptacle for example for arrangement on a housing tab of the housing 105. However, the at least one support element 255 can also be fixed on the housing 105 by means of a releasable connection, for example a clamping and / or screw connection. The housing 105 can also have a receptacle (not shown) in which the support element 255 of the sensor circuit board 160 is received.

[0044] Preferably, the sensor element 252 has a Hall sensor. Furthermore, the sensor element 252 can also have further elements. Furthermore, the sensor element 252 can also be configured as a Hall sensor. Here, the sensor element 252 is mechanically and electrically connected to the sensor circuit board 160, for example by means of soldering and / or by means of a plug connection.

[0045] The Hall sensor is configured for detecting a rotor position that belongs to the rotor 212. Thereby, a current number of revolutions can be determined. Depending on the determined number of revolutions, the drive motor 180 can then be controlled.

[0046] Figure 3 The arrangement of the sensor circuit board 160 shown in Figure 2 in the housing 105 of the hand-held power tool 100 shown in Figure 1 and the exemplary illustration of two preferably exactly oppositely arranged support elements 255 is shown. It is pointed out here that at least one support element 255 is provided. The number of support elements 255 is not limited here and there can therefore be any number of support elements 255.

[0047] At least one support element 255 is arranged on the housing 105. The support element 255 can be configured integrally with the housing 105. The support element 255 can also be embodied as a separate support element which is fixed on the housing 105. The support element 255 can be configured in a rail-like manner. Furthermore, the support element 255 can be configured according to a tongue / groove element, wherein the support element 255 constitutes the tongue element or the groove element and the housing 105 and / or the sensor circuit board 160 constitute the groove element or the tongue element. Here, the support element 255 can have a tongue element or a groove element on its side facing the housing 105 and a tongue element or a groove element on its side facing the sensor circuit board 160. However, the support element 255 can also be configured on the housing 105, for example integrally with the housing or fixed on the housing by means of fastening elements and have a tongue element or a groove element on its side facing the sensor circuit board 160.

[0048] According to an alternative or optional embodiment, the support element 255 can be configured in a U-shape. Furthermore, the support element 255 can be configured according to a plug type or a socket type. Alternatively or optionally, the support element 255 can be configured according to a coupling, wherein the support element 255 has a coupling geometry and the housing 105 and / or the sensor circuit board 160 has a coupling geometry which is assigned to the coupling geometry.

[0049] In Figure 3 the sensor circuit board 160 configured in a U-shape is shown in solid lines. Additionally, in Figure 3 an alternative configuration of the sensor circuit board 160' configured in a circle is shown in dashed lines. The sensor circuit board 160 has a slot 162 in which the drive shaft 215 is arranged. The slot 162 is approximately semicircular in the embodiment shown. The drive shaft 215 is arranged at least sectionally in the slot 162. The sensor circuit board 160 configured in a U-shape sectionally surrounds the drive shaft 215. The alternative configuration of the sensor circuit board 160' configured in a circle likewise has a slot 162' in which the drive shaft 215 is arranged. The slot 162' is substantially circular in the embodiment shown. The drive shaft 215 is arranged in the slot 162'. The drive shaft 215 projects through the slot 162' of the sensor circuit board 160'. The sensor circuit board 160' surrounds the drive shaft 215. Alternatively, the slots 162, 162' can also be of other geometrical shapes which are suitable for receiving the drive shaft 215.

[0050] Figure 4 It is shown Figure 1 and Figure 2a drive unit 127 having a drive motor 180, a transmission unit 125 and a sensor circuit board 160, wherein the sensor circuit board 160 is arranged according to an alternative arrangement between the drive motor 180 and the ventilation device 130. The ventilation device 130 and the sensor circuit board 160 are here positioned on an end 202 of the electronically commutated drive motor 185 facing the tool receptacle 140. Furthermore, Figure 4 The sensor circuit board 160 is shown directly, which preferably has a U-shaped base body 450.

[0051] However, the sensor circuit board 160 can also have a base body of any other shape, for example a C-shaped or I-shaped base body. Furthermore, the sensor circuit board 160 can also be constructed in two or more pieces. Here, for example two I-shaped base bodies can constitute the sensor circuit board 160. In general, the sensor circuit board 160 is constructed such that it can be arranged or positioned in the region of the stator 211 after assembly of the drive unit 127.

Claims

1. A hand-held power tool (100), having: a tool receptacle (140), and a housing (105) in which at least one electronically commutated drive motor (185) is arranged for driving an insert tool that can be arranged in the tool receptacle (140); and a sensor circuit board (160) arranged in the housing (105), on which a sensor element (252) is arranged in order to enable sensor-controlled commutation of the electronically commutated drive motor (185), at least one bearing element (255) is provided for bearing the sensor circuit board (160) in the housing (105) and for arranging the sensor circuit board (160) on the electronically commutated drive motor (185), wherein the sensor circuit board (160) is mechanically decoupled from the electronically commutated drive motor (185), wherein the sensor circuit board (160) has a slot (162) in which a drive shaft (215) of the electronically commutated drive motor (185) is arranged, and wherein the sensor circuit board (160) is mechanically decoupled from, but positioned on, a stator (211) of the electronically commutated drive motor (185). The at least one bearing element (255) has a receptacle (257) for at least section-wise receiving the sensor circuit board (160). The at least one bearing element (255) is arranged on the housing (105). The at least one bearing element (255) is arranged on the sensor circuit board (160). characterized in that The at least one bearing element (255) is fixed on the sensor circuit board (160) by means of injection molding.

2. The hand-held power tool according to claim 1, characterized in that A ventilation device (130) is arranged in the housing (105), wherein the ventilation device (130) is positioned on an end (202) of the electronically commutated drive motor (185) that faces the tool receptacle (140).

3. The hand-held power tool as claimed in claim 1 or 2, characterized in that A ventilation device (130) is arranged in the housing (105), wherein the ventilation device (130) is positioned on an end (201) of the electronically commutated drive motor (185) that faces away from the tool receptacle (140).

4. The hand-held power tool as claimed in claim 1 or 2, characterized in that The sensor circuit board (160) is arranged between the ventilation device (130) and the electronically commutated drive motor (185).

5. The hand-held power tool as claimed in claim 4, characterized in that The sensor circuit board (160) is arranged between the ventilation device (130) and the electronically commutated drive motor (185).

6. The hand-held power tool according to any one of claims 1, 2 and 5, characterized by, The sensor circuit board (160) is positioned on an end (201) of the electronically commutated drive motor (185) that faces away from the tool receptacle (140).

7. The hand-held power tool according to any one of claims 1, 2 and 5, characterized by, The sensor circuit board (160) has a U-shaped base body (450).

8. The hand-held power tool according to claim 6, characterized by The sensor circuit board (160) has a circular base body (450).

9. The hand-held power tool according to Claim 7, characterized by The sensor element (252) has a Hall sensor.

10. The hand-held power tool of claim 6, characterized by ​ 11. The hand-held power tool according to any one of claims 1, 2, 5, 8 to 10, characterized by, ​ 12. The hand-held power tool according to any one of claims 1, 2, 5, 8 to 10, characterized by, ​ 13. The hand-held power tool according to any one of claims 1, 2, 5, 8 to 10, characterized by, ​ 14. The hand-held power tool according to any one of claims 1, 2, 5, 8 to 10, characterized by, The sensor circuit board (160) is electrically connected to an electronics unit (187) which is assigned to the electronically commutated drive motor (185).

15. The hand-held power tool according to any one of claims 1, 2, 5, 8 to 10, characterized by, An energy supply unit (190) is provided for energizing the electronically commutated drive motor (185).

16. The hand-held power tool of claim 15, characterized by The energy supply unit (190) is designed as a battery pack.

17. The hand-held power tool according to any one of claims 1, 2, 5, 8 to 10 and 16, characterized by, The hand-held tool is designed as a rotary hammer.

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