Handheld machine tool having a sensor board

Abstract

[Solution] A handheld machine tool (100) having a tool holder (140) and a housing (105), wherein at least one electronically commutated drive motor (185) for driving an insert tool that can be placed in the tool holder (140) is arranged in the housing (105), and the housing (105) has a sensor board (160) arranged in the housing (105), and a sensor element (252) is arranged on the sensor board (160) to enable sensor-controlled commutation of the electronically commutated drive motor (185), wherein at least one support element (255) is provided to support the sensor board (160) within the housing (105) and to position the sensor board (160) on the electronically commutated drive motor (185), wherein the sensor board (160) is mechanically separated from the electronically commutated drive motor (185).

Description

Technical Field

[0001] The present invention relates to a hand-held power tool having a tool holder and a housing, in which at least one electronically rectified drive motor for driving an insertion tool that can be arranged in the tool holder is arranged in the housing, and which has a sensor board arranged in the housing, and in which sensor elements are arranged on the sensor board in order to enable sensor-controlled rectification of the electronically rectified drive motor.

Background Art

[0002] From the prior art, hand-held power tools configured as screwdrivers of this type are known, which have an electronically rectified drive motor for driving an insertion tool that can be arranged in the tool holder in the housing. The electronically rectified drive motor is rectified in a sensor-controlled manner, and for this purpose, a sensor board having sensor elements, preferably Hall sensors, is provided. The sensor board is mechanically arranged or fixed to the electronically rectified drive motor.

Summary of the Invention

[0003] The present invention relates to a hand-held power tool having a tool holder and a housing, in which at least one electronically rectified drive motor for driving an insertion tool that can be arranged in the tool holder is arranged in the housing, and which has a sensor board arranged in the housing, and in which sensor elements are arranged on the sensor board in order to enable sensor-controlled rectification of the electronically rectified drive motor. At least one support element is provided for supporting the sensor board in the housing and arranging the sensor board relative to the electronically rectified drive motor, where the sensor board is mechanically separated from the electronically rectified drive motor.

Advantages of the Invention

[0004] This enables the present invention to provide a handheld machine tool that allows for the easy and stable placement of a sensor substrate within the housing of the handheld machine tool by at least one support element. Furthermore, the at least one support element allows for a compact arrangement of the drive motor and the sensor substrate.

[0005] In an embodiment of at least one support element, the at least one support element has a receiving portion for at least partially receiving a sensor substrate.

[0006] Preferably, at least one support element is provided in the housing. This allows for mechanical separation from the drive motor in a simple form and method.

[0007] At least one of the support elements is disposed on the sensor substrate, either selectively or additionally. A receiving portion for the support element is provided within the housing of a handheld machine tool to support the support element within the housing.

[0008] In one embodiment, at least one support element is fixed to the sensor substrate by injection molding. This allows for a secure and robust placement of at least one support element.

[0009] In one embodiment, a fan is located within the housing, positioned at the end of an electronically rectified drive motor facing the tool holder. This allows for simple and straightforward cooling of handheld machine tools, such as transmission and / or impact mechanisms.

[0010] In a selective embodiment, the fan is located within the housing, in which case it is positioned at the end of the electronically rectified drive motor opposite the tool holder. This allows for simple and straightforward cooling of a handheld machine tool, such as the drive motor.

[0011] In a preferred configuration, the sensor board is positioned between the fan and the electronically rectified drive motor. This allows for proper wiring and / or cooling in a simple form and manner. In this case, the sensor board and fan may be positioned at the end of the electronically rectified drive motor opposite the tool holder. In this case, the armature bearing for supporting the drive shaft may be positioned such that the sensor board is located between the armature bearing and the fan, at the end of the electronically rectified drive motor opposite the tool holder. In this case, the sensor board and fan may selectively be positioned at the end of the electronically rectified drive motor facing the tool holder.

[0012] The sensor substrate preferably has a U-shaped base. Within the framework of this invention, the term "U-shaped base" can also be interpreted as a base with an open shape different from a U-shape, such as a C-shape, arch-shaped, or semi-circular base. This allows for simple and easy assembly of the sensor substrate, and in this case, the assembly of the sensor substrate can be performed after the assembly of the drive motor.

[0013] The sensor substrate selectively has a circular base. Within the framework of this invention, a circular base can also be interpreted as a closed-shaped base other than a circle, such as an oval or elliptical base. A circular base provides more surfaces for housing, for example, sensors and other electronic components on the sensor substrate.

[0014] In another embodiment, the sensor board is positioned at the end of the electronically rectified drive motor opposite the tool holder. In this case, the fan may be positioned at the end of the electronically rectified drive motor facing the tool holder. The armature bearing for supporting the drive shaft may be positioned such that the sensor board is located between the armature bearing and the end of the electronically rectified drive motor opposite the tool holder. This allows for further appropriate placement of the sensor board in a simple and straightforward manner.

[0015] In a preferred form, the sensor element has a Hall sensor. This can provide a reliable and inexpensive sensor element.

[0016] The sensor board is preferably electrically connected to an electronic unit that is arranged to accommodate an electronically rectified drive motor. This allows for a sensor board that can be easily assembled because it eliminates the need for a plug-in connector to connect to the electronic unit.

[0017] An energy supply unit, preferably configured as a battery pack, is provided to supply energy to an electronically rectified drive motor. This allows for adequate energy supply in a simple form and manner.

[0018] In one embodiment, a handheld machine tool is configured as an impact driver. This allows for the simple and straightforward provision of a handheld machine tool suitable for use with a sensor board. [Brief explanation of the drawing]

[0019] [Figure 1] This is a side view of a handheld machine tool according to the present invention. [Figure 2] Figure 1 is a partial longitudinal cross-sectional view of a handheld machine tool, clearly showing the arrangement of the sensor boards installed in the handheld machine tool. [Figure 3] This is a plan view of a sensor board located inside the housing of a handheld machine tool, as seen from the second axial end of the handheld machine tool. [Figure 4] Figure 1 shows a partial cross-sectional view of a handheld machine tool, clearly illustrating an alternative arrangement of the sensor boards installed in the handheld machine tool. [Modes for carrying out the invention]

[0020] The present invention will be described in detail below with reference to the embodiments shown in the drawings.

[0021] Figure 1 shows an example of a hand-held power tool 100. This hand-held power tool 100 has a housing 105 with a handle 115. According to one embodiment, the hand-held power tool 100 can be mechanically and electrically connected to an energy supply unit 190 for power supply independent of the power grid.

[0022] Inside the housing 105, a drive unit 127 is preferably arranged, which has a first axial end 101 and a second axial end 102 facing the first axial end 101. The drive unit 127 has at least one transmission unit 125 and an electric drive motor 180.

[0023] Preferably, the energy supply unit 190 is provided to supply energy to the drive motor 180 of the hand-held power tool 100. In a preferred form, the energy supply unit 190 is configured as a battery pack. Alternatively or additionally, the hand-held power tool 100 may be drivable in a power grid-dependent manner.

[0024] The drive motor 180 is preferably configured as an electronically rectified drive motor 185. For this purpose, a sensor substrate 160 with a sensor element (reference numeral 252 in FIG. 2) is arranged corresponding to the drive motor 180 for sensor-controlled rectification. The sensor substrate 160 is preferably mechanically separated from the electronically rectified drive motor 185. The drive motor 180 or the drive shaft 215 (FIG. 2) of the drive motor 180 is supported in the housing 105 via an armature bearing 217.

[0025] The drive motor 180 can be switched on and off, for example, via a hand switch 195. Further, a tool receptacle 140 for receiving an insertion tool, such as a screwdriver bit, a drill, or the like, is correspondingly arranged at the second axial end 102 of the handheld power tool 100. The drive motor 180 is configured in a suitable form to drive the tool receptacle 140 and thus the insertion tool.

[0026] In a suitable form, the transmission unit 125 is arranged on the side facing the second axial end 102, and the drive motor 180 is arranged on the side facing the first axial end 101. Preferably, at least one transmission 120 is correspondingly arranged in the transmission unit 125.

[0027] For example, the handheld power tool 100 is configured as an impact driver having an impact mechanism 150. The impact mechanism 150 is correspondingly arranged in the transmission unit 125. It should be noted that the present invention is not limited to an impact driver and can also be used in various handheld power tools having a sensor-controlled drive motor with and without an impact mechanism 150, such as a battery-powered driver drill.

[0028] Furthermore, preferably, a fan 130 is provided. For example, as shown in the figures, the fan 130 is positioned at the first axial end 101 or at the end 201 of the electronically rectified drive motor 185 opposite to the tool receptacle 140. However, the fan 130 may be arranged at any other location within the housing 105. The fan 130 may be arranged, for example, as shown in FIGS. 2 and 4, at the end 202 of the electronically rectified drive motor 185 facing, for example, the tool receptacle 140 or the second axial end 102. The sensor board 160 is preferably arranged between the fan 130 and the drive motor 180, as shown in FIGS. 1 and 4. However, the handheld power tool 100 may be configured without a fan 130.

[0029] Furthermore, the handheld machine tool 100 has an electronic unit 187. Preferably, the electronic unit 187 is arranged in correspondence with the drive motor 180. According to one embodiment, the electronic unit 187 is configured as the main electronics, to which signals from the drive motor 180 and the sensor board 160 are transmitted. Preferably, the sensor board 160 is electrically connected to the electronic unit 187, in which case electrical connections may be formed via soldered circuits and / or plug connectors.

[0030] Figure 2 shows the drive unit 127 shown in Figure 1, comprising a drive motor 180, a transmission unit 125, and a sensor board 160. In this case, Figure 2 shows the drive motor 180 configured as an electronically rectified drive motor 185, which is bearing in the housing 105 via a drive shaft 215 and has a stator 211 and a rotor 212. In the illustrated embodiment, the bearing of the drive shaft 215 within the housing 105 is performed using an armature bearing 217 in the region of the first axial end 101. The armature bearing 217 is positioned at the end 201 of the electronically rectified drive motor 185 opposite to the tool holder 140.

[0031] Selectively or additionally, the drive shaft 215 may be bearing within a transmission flange arranged in accordance with the transmission unit 125. Such electronically rectified drive motors 185 are well known in the prior art and will not be described in detail here.

[0032] In Figure 2, the fan 130 is positioned, for example, on the side facing the second axial end 102 or on the driven side of the drive motor 180 and transmission unit 125. The fan 130 is positioned at the end 202 of the electronically rectified drive motor 185 on the side facing the tool holder 140. However, the fan 130 may also be positioned on the side of the drive motor 180 facing the first axial end 101 of the drive unit 127, as schematically shown in Figure 1. In this case, the fan 130 is positioned or supported on the drive shaft 215 in a preferred manner.

[0033] In Figure 2, the sensor substrate 160 is positioned at the end 201 of the electronically rectified drive motor 185 opposite to the tool holder 140. The sensor substrate 160 is positioned between the armature bearing 217 and the electronically rectified drive motor 185 at the end 201 of the electronically rectified drive motor 185 opposite to the tool holder 140. Preferably, at least one support element 255 is provided to support the sensor substrate 160 within the housing 105 and to position the sensor substrate 160 on the electronically rectified drive motor 185. Preferably, the at least one support element 255 is configured as an intermediate element between the housing 105 and the sensor substrate 160.

[0034] In the drawings, at least one support element 255 is positioned on the housing shell or housing half shell forming the housing 105. However, it should be noted that the housing 105 may, in a preferred form, have a lid at the first axial end 101 or at the left end in the drawings, as shown in Figure 2. This lid can preferably be fixed to the housing half shell via, for example, a clamping joint and / or a screw joint. In this case, the drive shaft 215 may be coupled to both the rotor 212 and the lid, or supported by both the rotor 212 and the lid. According to another embodiment, the sensor substrate 160 may be positioned on the lid via at least one support element 255 and thus supported within the housing 105.

[0035] The sensor board 160 is mechanically isolated from the electronically rectified drive motor 185; that is, the sensor board 160 is not axially fixed to the stator 211 of the drive motor 185 as in the prior art, but is mechanically fixed within the housing 105 independently of the stator 211. In this case, the sensor board 160 is mechanically isolated from the drive motor 185 and especially from the stator 211, but is still positioned relative to the stator 211.

[0036] It should be noted that because the sensor board 160 is mechanically separated from the drive motor 180, the drive motor 180 can be driven without the sensor board 160, that is, it can be driven as a drive motor that is rectified without a sensor. Furthermore, a drive motor that is rectified without a sensor can be retrofitted with a sensor board 160 that is electronically separated from the drive motor, and configured as a drive motor that is rectified with sensor control. In addition, the separation simplifies the replacement of the sensor board 160 in the event of a failure of, for example, the sensor element 252.

[0037] In one embodiment, at least one support element 255 is fixed to the housing 105. Preferably, at least one support element 255 has a receiving portion 257 for at least partially receiving the sensor substrate 160. Preferably, a point support portion or a surface support portion is formed.

[0038] In a preferred configuration, the sensor substrate 160 may be positioned within the housing 105 via a support element 255 having one support point, in which case a so-called single-point support or single-plane support is preferably formed. Furthermore, a two-point support or two-plane support, or a support having more than two points or planes, such as a three-point support, a three-plane support, a four-point support, or a four-plane support, may be provided, for example as shown in Figure 3. Furthermore, the support element 255 may be configured in a C-shape, in which case the sensor element 160 is supported via a predetermined area within the housing 105, in which case, for example, a tongue-and-groove joint is formed between the support element 255 and the sensor substrate 160.

[0039] In this case, the support element 255 is firmly fixed inside the housing 105 by, for example, friction-type fastening, shape-type fastening, and / or material-type fastening. Furthermore, the support element 255 may be integrally formed with the housing 105.

[0040] In the selective arrangement configuration, at least one support element 255 is fixed to or injected onto the sensor substrate 160 by injection molding. This may be done, for example, by couplings and / or connectors having corresponding shapes. In this case, at least one support element 255 has a receiving portion for placement, for example, on the housing web of the housing 105. However, at least one support element 255 may be fixed to the housing 105 via a releasable connection portion, for example, a clamping connection portion and / or a screw connection portion. The housing 105 may have a receiving portion (not shown) in which the support element 255 of the sensor substrate 160 is received.

[0041] In a preferred form, the sensor element 252 has a Hall sensor. Furthermore, the sensor element 252 may have other components. Furthermore, the sensor element 252 may be configured as a Hall sensor. In this case, the sensor element 252 is mechanically and electrically connected to the sensor substrate 160, for example, via soldering and / or plug-in connectors.

[0042] The Hall sensor is configured to detect the rotor position assigned to the rotor 212. This allows the rotational speed at that time to be calculated. Depending on the calculated rotational speed, the drive motor 180 can be controlled again.

[0043] Figure 3 shows the arrangement of the sensor substrate 160 shown in Figure 2 within the housing 105 of the handheld machine tool 100 shown in Figure 1, clearly showing, for example, two support elements 255 facing each other in the diametrical direction. It should be noted that at least one support element 255 is provided. In this case, the number of support elements 255 is not limited, and any number of support elements 255 may be provided.

[0044] At least one support element 255 is located within the housing 105. The support element 255 may be integrally configured with the housing 105. The support element 255 may be configured as a separate support element fixed to the housing 105. The support element 255 may be configured in a rail shape. Furthermore, the support element 255 may be configured according to a groove / tongue component, in which case the support element 255 forms a groove component or tongue component, and the housing 105 and / or sensor substrate 160 forms a tongue component or groove component. In this case, the support element 255 may preferably have a groove or tongue component on the side facing the housing 105 and a groove or tongue component on the side facing the sensor substrate 160. However, the support element 255 may also be integrally configured with the housing 105, for example, or fixed to the housing via a fixing element, and may have a groove or tongue component on the side facing the sensor element 160.

[0045] In a selective or alternative embodiment, the support element 255 may be configured in a U-shape. Furthermore, the support element 255 may be configured in the form of a connector or outlet. Selectively or alternatively, the support element 255 may be configured according to a coupling, in which case the support element 255 has a coupling geometry, and the housing 105 and / or sensor substrate 160 have a coupling geometry corresponding to the coupling geometry.

[0046] In Figure 3, a U-shaped sensor substrate 160 is shown by a solid line. Additionally, an alternative configuration, a circular sensor substrate 160', is shown by a dashed line in Figure 3. The sensor substrate 160 has a notch 162, within which the drive shaft 215 is positioned. The notch 162 is approximately semicircular in the illustrated embodiment. The drive shaft 215 is positioned at least partially within the notch 162. The U-shaped sensor substrate 160 partially surrounds the drive shaft 215. The alternative configuration of the circular sensor substrate 160' similarly has a notch 162', within which the drive shaft 215 is positioned. The notch 162' is approximately circular in the illustrated embodiment. The drive shaft 215 is positioned within the notch 162'. The drive shaft 215 engages with the notch 162' of the sensor substrate 160'. The sensor substrate 160' surrounds the drive shaft 215. The notches 162, 162' may adopt a different geometric shape that is suitable for receiving the drive shaft 215 instead.

[0047] Figure 4 shows the drive unit 127 shown in Figures 1 and 2, which includes a drive motor 180, a transmission unit 125, and a sensor board 160, in which case the sensor board 160 in an alternative arrangement configuration is positioned between the drive motor 180 and the fan 130. In this case, the fan 130 and the sensor board 160 are positioned at the end 202 of the electronically rectified drive motor 185 on the side facing the tool holder 140. Furthermore, Figure 4 shows the sensor board 160 having a U-shaped base 450 in a preferred form.

[0048] However, the sensor substrate 160 may have a base body molded into any other shape, such as a C-shaped base body or an I-shaped base body. Furthermore, the sensor substrate 160 may consist of two or more parts. In this case, for example, two I-shaped base bodies can form the sensor substrate 160. Generally, the sensor substrate 160 is configured so that it can be placed or positioned within the range of the stator 211 after the assembly of the drive unit 127. [Explanation of symbols]

[0049] 100 Handheld Machine Tools 101 First axial end 102 Second axial end 105 Housing 115 Handle 120 Transmission device 125 Transmission Unit 127 Drive Unit 130 fans 140 Tool Holder 150 striking mechanism 160,160′ Sensor board 162,162′ notch 180 Electric drive motor 185 Drive motor 187 Electronic Unit 190 Energy supply units 195 Hand switch 201 End 202 End 211 Stator 212 Rotor 215 Drive shaft 217 Armature bearing 252 sensor elements 255 Support element 257 Receiving part 450 Base

Claims

1. A handheld machine tool (100) having a tool receptacle (140) and a housing (105), wherein at least one electronically commutated drive motor (185) is disposed within the housing (105) for driving an insert tool that can be disposed within the tool receptacle (140), and wherein the handheld machine tool (100) has a sensor board (160) disposed within the housing (105), and wherein a sensor element (252) is disposed on the sensor board (160) to enable sensor-controlled commutation of the electronically commutated drive motor (185), 1. A handheld machine tool comprising: at least one support element (255) for supporting the sensor board (160) within the housing (105) and for positioning the sensor board (160) on the electronically commutated drive motor (185); wherein the sensor board (160) is mechanically isolated from the electronically commutated drive motor (185).

2. 2. The handheld machine tool according to claim 1, wherein at least one of the support elements (255) has a receiving portion (257) for at least partially receiving the sensor board (160).

3. 3. A handheld machine tool according to claim 1 or 2, characterized in that at least one of the support elements (255) is arranged on the housing (105).

4. 4. A handheld machine tool according to claim 1, wherein at least one of the support elements (255) is arranged on the sensor board (160).

5. 5. A handheld machine tool according to claim 4, characterized in that at least one of the support elements (255) is fixed to the sensor substrate (160) by injection molding.

6. 6. The handheld machine tool according to claim 1, wherein a fan (130) is arranged in the housing (105), the fan (130) being positioned at an end (202) of the electronically commutated drive motor (185) facing the tool holder (140).

7. 6. A handheld machine tool according to claim 1, wherein a fan (130) is arranged in the housing (105), the fan (130) being positioned at an end (201) of the electronically commutated drive motor (185) opposite the tool holder (140).

8. 8. A handheld machine tool according to claim 1, wherein the sensor board (160) is arranged between the fan (130) and the electronically commutated drive motor (185).

9. 7. The handheld machine tool of claim 6, wherein the sensor board (160) is positioned at an end (201) of the electronically commutated drive motor (185) opposite the tool receptacle (140).

10. 10. A handheld machine tool according to claim 1, wherein the sensor board (160) has a U-shaped base (450).

11. 10. A handheld machine tool according to claim 1, wherein the sensor substrate (160) has a circular base body (450).

12. 12. A handheld machine tool according to claim 1, wherein the sensor element (252) comprises a Hall sensor.

13. 13. A handheld machine tool according to claim 1, wherein the sensor board (160) is electrically connected to an electronic unit (187) associated with the electronically commutated drive motor (185).

14. 14. A handheld machine tool according to claim 1, further comprising an energy supply unit (190) for supplying the electronically commutated drive motor (185) with energy, the energy supply unit (190) being preferably configured as a battery pack.

15. 15. A handheld machine tool according to claim 1, configured as an impact driver.

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