CN220358924U

CN220358924U - Brush holder for an electric motor, electric motor and motor apparatus

Info

Publication number: CN220358924U
Application number: CN202321999971.2U
Authority: CN
Inventors: 胡永美; 吴慧燕; 江家勇; 贺珩
Original assignee: Bosch Automotive Products Changsha Co Ltd
Current assignee: Bosch Automotive Products Changsha Co Ltd
Priority date: 2023-07-27
Filing date: 2023-07-27
Publication date: 2024-01-16
Anticipated expiration: 2033-07-27

Abstract

The present application relates to a brush holder for an electric motor, which is an electric motor for electrically adjusting a movable member in a vehicle, comprising: a base body for covering the motor housing and having a first side facing away from the motor housing; a first cylindrical mounting portion provided on a first side of the base; wherein the outer periphery of the first mounting portion is provided with a notch and is configured to allow a circuit board for the motor to be fitted over the first mounting portion and to be caught in the notch with a convex portion of the circuit board. The application also relates to a corresponding motor and motor apparatus. The application has the advantages that: the assembly process can be optimized by using a circuit board and surface mount devices; the design of the position of the notch can obviously shorten the distance between the sensor and the magnetic ring to promote induction signals, and the position of the sensor is close to an electric line of the interface part to promote electromagnetic compatibility; by means of the special structural design, the circuit board and the pins can be pre-positioned, which is advantageous for later mounting of the pins on the circuit board.

Description

Brush holder for an electric motor, electric motor and motor apparatus

Technical Field

The present application relates to a brush holder for an electric motor, an electric motor and an electric motor apparatus. The present application relates in particular to the field of electric motors for electrically adjusting moving parts in vehicles.

Background

Vehicles include a number of moving parts such as the vehicle seat back, sunroof, window glass, or steering wheel column, among others. To electrically adjust these moving parts, vehicles typically include a plurality of motor devices. The electromechanical device generally comprises an electric motor and a transmission. The transmission may have a transmission housing that may be assembled with the motor housing of the motor by screws so that the motor and transmission may be sold together as a motor apparatus. The motor of the motor device may relate to a brushed motor. In order to mount the brushes of the motor, the motor has a brush holder. In addition to accommodating brushes, brush holders generally have other functions, for example for carrying electronics, for covering a motor housing, for mounting a gear and/or for forming an interface, etc.

Current brush holders and the electronics they carry are complex in construction and difficult to assemble.

Disclosure of Invention

An object of the present application is to provide a brush holder for an electric motor, which makes it possible to simplify the structure of the electric motor apparatus and to significantly reduce the assembly cost of the electric motor apparatus.

According to a first aspect of the present application, there is provided a brush holder for an electric motor for electrically adjusting a movable member in a vehicle, the brush holder comprising:

a base body for covering a motor housing of the motor and having a first side facing away from the motor housing;

a cylindrical first mounting portion provided on a first side of the base;

wherein the outer periphery of the first mounting portion is provided with a notch, the first mounting portion being configured to allow a circuit board for the motor to be fitted around the first mounting portion and to be caught in the notch with a convex portion of the circuit board.

According to an alternative embodiment of the present application, the base body has a through hole, and the brush frame is configured to allow a sensor for the motor mounted to the convex portion of the circuit board to pass through the base body via the through hole.

According to an alternative embodiment of the present application, the brush holder comprises at least one of the following features:

the notch is communicated with the through hole;

the brush holder includes an interface portion for inserting an external terminal, and the notch is located adjacent to the interface portion on an outer periphery of the first mounting portion.

According to an alternative embodiment of the application, the brush holder comprises a second mounting portion provided on a second side of the base body facing the motor housing and intended to be snapped into the motor housing, the second mounting portion having a cutout and/or a channel for pre-mounting a ground pin for connecting the circuit board with the motor housing, a direction from the second side across the base body to the first side being referred to as a first direction, the cutout being cut into the second mounting portion in the first direction and being configured to allow the ground pin to enter the second mounting portion via the cutout, the channel extending parallel to the first direction and being configured to accommodate the ground pin.

the base body has a snap-fit portion configured to snap-fit a power pin and/or a sensor pin for the motor;

the base body has a pre-positioning slot configured to pre-position a power pin and/or a sensor pin for the motor.

According to a second aspect of the present application, there is provided an electric motor comprising a circuit board and the aforementioned brush holder for an electric motor, the circuit board being fitted over a first mounting portion of the brush holder and being caught in a notch of the first mounting portion with a convex portion.

According to a third aspect of the present application, there is provided an electric motor comprising a circuit board, a sensor mounted to a convex portion of the circuit board and penetrating a base body of the brush holder via a through hole of the base body, and the aforementioned brush holder for an electric motor.

According to an alternative embodiment of the present application, the sensor is a hall sensor.

According to a fourth aspect of the present application there is provided an electrical machine comprising a ground pin and the aforementioned brush holder for an electrical machine, the ground pin having a U-shaped clamping section for clamping to a cutout and/or channel of the second mounting portion of the brush holder, the U-shaped clamping section comprising two legs and a bottom edge connecting the two legs, the bottom edge passing through the cutout and/or the legs clamping to the channel.

According to an alternative embodiment of the present application, the ground pin is circular in cross section.

According to a fifth aspect of the present application, there is provided an electric machine comprising a brush holder as described above for an electric machine, the electric machine further comprising a power pin and/or a sensor pin having a pre-assembled section adapted to lie flat in a pre-positioned slot of a base body of the brush holder and to be snapped by a snap-fit portion.

According to a sixth aspect of the present application, there is provided an electrical machine apparatus comprising a transmission and the aforementioned electrical machine, the first mounting portion of the brush holder of the electrical machine being adapted to be inserted into the transmission housing of the transmission.

In at least some embodiments, the positive effects of the present application are: the traditional pin type device is replaced by a circuit board and a surface mount device, so that the assembly process can be optimized; the gap of the first installation part of the brush holder and the position design of the convex part of the circuit board can obviously shorten the distance between the sensor and the magnetic ring to promote induction signals, and the position of the sensor is close to an electric line of the interface part to promote electromagnetic compatibility; by means of the special structural design, the circuit board and various pins can be pre-positioned, which is beneficial for later mounting of the pins on the circuit board.

Drawings

The principles, features and advantages of the present application may be better understood by describing the present application in more detail with reference to the drawings. The drawings include:

fig. 1 schematically shows an example of the motor apparatus of the present application in a perspective view.

Fig. 2 schematically illustrates an example of a first side of a brush holder with electronics.

Fig. 3 schematically illustrates an example of a second side of a brush holder with electronics.

Fig. 4 schematically shows an example of a brush holder with electronics in a perspective view.

Fig. 5 schematically shows an example of a brush holder with electronics in a perspective view.

Fig. 6 schematically shows the area outlined with a broken line in fig. 5 in an enlarged view.

Fig. 7 schematically illustrates an example of a ground pin in a perspective view.

Fig. 8 schematically shows the area outlined with a broken line in fig. 4 in an enlarged view.

Detailed Description

In order to make the technical problems, technical solutions and advantageous technical effects to be solved by the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and a plurality of exemplary embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the present application.

Vehicles include a number of moving parts such as the vehicle seat back, sunroof, window glass, or steering wheel column, among others. To electrically adjust these moving parts, vehicles typically include a plurality of motor devices. The electromechanical device generally comprises an electric motor 1 and a transmission 7. The transmission 7 may have a transmission housing 70, and the transmission housing 70 may be assembled with the motor housing 10 of the motor 1 by screws so that the motor 1 and the transmission 7 may be sold together as a motor apparatus. The motor 1 of the motor device may relate to a brushed motor. In order to mount the brushes 11 of the motor 1, the motor 1 has a brush holder 2. The brush holder 2 generally has other functions besides accommodating the brushes 11, for example for carrying electronics, for covering the motor housing 10, for mounting the gear 7 and/or for forming the interface 23, etc.

The current brush holders 2 and the electronic components carried thereby are structurally complex and difficult to assemble.

In this respect, the present application proposes an improvement of the brush holder 2 and the related parts in order to simplify the construction and assembly process of the motor apparatus.

Fig. 2 schematically shows an example of a first side of a brush holder 2 with electronics.

Fig. 3 schematically shows an example of the second side of the brush holder 2 with electronics.

Fig. 4 schematically shows an example of a brush holder 2 with electronics in a perspective view. Here, the circuit board 3 and the surface mount devices on the circuit board 3 are removed.

As shown in fig. 1 to 4, the brush holder 2 includes:

a base body 20, the base body 20 being intended to cover the motor housing 10 of the motor 1 and having a first side facing away from the motor housing 10;

a first cylindrical, in particular cylindrical, mounting portion 21, the first mounting portion 21 being provided on a first side of the base body 20;

wherein the outer periphery of the first mounting portion 21 is provided with a notch 210, the first mounting portion 21 being configured to allow the circuit board 3 for the motor 1 to be fitted over the first mounting portion 21 and to be snapped into the notch 210 with the convex portion 30 of the circuit board 3.

The recess 210 in the first mounting portion 21 allows the printed circuit board 3 to be simply preloaded onto the brush holder 2 in the correct orientation. In preassembling, the circuit board 3 is first fitted onto the first mounting portion 21, and then the circuit board 3 is pushed until it abuts against the base 20. The raised portion 30 of the circuit board 3 also provides a mounting location for the electronics close enough to the central axis of the motor 1 to meet the mounting location requirements of the particular electronics, e.g., sensor, etc.

For convenience of manufacture, as shown in fig. 2, the notch 210 of the first mounting portion 21 of the brush holder 2 is substantially rectangular in cross section, and the convex portion 30 of the circuit board 3 is also substantially rectangular. But other shapes are also conceivable as appropriate. The first mounting portion 21 has in particular only one recess 210 for the engagement of a projection 30 of the circuit board 3, but a plurality of recesses 210 is also conceivable.

As shown in fig. 3, the brush holder 2 further comprises, in particular, a receptacle 24 for receiving the brush 11, the receptacle 24 being provided on a second side of the base body 20 facing the motor housing 10.

According to an exemplary embodiment, see fig. 2 and 3, the base body 20 has a through hole 203, and the brush holder 2 is configured to allow the sensor 4 for the motor 1 mounted to the convex portion 30 of the circuit board 3 to pass through the base body 20 by means of the through hole 203. Thereby, the sensor 4 can reach the second side of the base body 20 via the through-hole 203, so that a corresponding induction takes place in the motor housing 10. The recess 210 of the first mounting part 21 communicates in particular with the through-opening 203 of the base body 20, but it is also conceivable that they are slightly offset from one another. The cross-sections of the notch 210 and the through-hole 203 may be equal in size, but may also be different from each other, e.g., the cross-section of the notch 210 may be larger than the cross-section of the through-hole 203. The sensor 4 is in particular a hall sensor. By mounting the hall sensor to the boss portion 30 of the circuit board 3 that is snap-fitted into the notch 210, the distance from the hall sensor to the magnet ring can be significantly shortened to raise the induction signal. But the sensor 4 may also be other sensors such as a temperature sensor.

According to an exemplary embodiment, as shown in fig. 3, the brush holder 2 includes an interface portion 23 for plugging an external terminal, and the notch 210 is located adjacent to the interface portion 23 on the outer periphery of the first mounting portion 21. By positioning the notch 210 in such a way that the distance between the sensor 4 and the interface 23 is short, the electrical line from the sensor 4 to the interface 23 is short.

Fig. 5 schematically shows an example of a brush holder 2 with electronics in a perspective view. As shown in fig. 5, the interface portion 23 accommodates therein the pins 9, and external terminals can be electrically connected with the circuit board 3 via the pins 9 for supplying power to the motor apparatus and for controlling the motor apparatus.

Fig. 6 schematically shows the area outlined with a broken line in fig. 5 in an enlarged view. Here, the ground pin 5 is removed.

Fig. 7 schematically shows an example of the ground pin 5 in a perspective view.

According to an exemplary embodiment, as shown in fig. 5 to 7, the brush holder 2 comprises a second mounting portion 22, the second mounting portion 22 being provided on a second side of the base body 20 facing the motor housing 10 and being for snap-fitting to the motor housing 10, the second mounting portion 22 having a cut-out 220 and/or a channel 221 for pre-mounting the ground pin 5 for connecting the circuit board 3 with the motor housing 10, a direction traversing the base body 20 from the second side to the first side being referred to as a first direction 8, the cut-out 220 being cut into the second mounting portion 22 in the first direction 8 and being configured to allow the ground pin 5 to enter into the second mounting portion 22 via the cut-out 220, the channel 221 extending parallel to the first direction 8 and being configured to accommodate the ground pin 5. The ground pin 5 can be pre-positioned on the second mounting portion 22 by the cut-out 220 and/or the channel 221 to simplify assembly. Furthermore, the length of the shorting pin 5 in the first direction 8 is also made by the cutout 220. The channel 221 is used in particular for guiding the ground pin 5 when the ground pin 5 is preassembled and for positioning the ground pin 5 after assembly. Furthermore, the channel 221 also allows the ground pin 5 to protrude only partially from the outer surface of the second mounting portion 22, so that the ground pin 5 does not excessively hinder the insertion of the second mounting portion 22 into the motor housing 10 on the one hand, and the ground pin 5 is in good contact with the motor housing 10 after insertion on the other hand. Here, as shown in fig. 7, the ground pin 5 has, in particular, a U-shaped clamping section 50 with a cutout 220 and/or a channel 221 for clamping to the second mounting portion 22 of the brush holder 2, the U-shaped clamping section 50 comprising two legs 52 and a bottom edge 51 connecting the two legs 52, the bottom edge 51 being clamped to the channel 221 through the cutout 220 and/or the legs 52. As shown in fig. 7, the ground pin 5 is exemplarily circular in cross section. Thereby clamping the ground pin 5 into the cutout 220 and the channel 221 conveniently and stably. The other end of the ground pin 5 is connected to the circuit board 3 through the base 20. As shown in fig. 6, the channel 221 is rectangular in cross-section, but it is also conceivable that the channel 221 is semicircular in cross-section. At least the outer periphery of the second mounting portion 22 is provided with a channel 221 to facilitate contact with the motor housing 10, but it is also conceivable that the inner periphery of the second mounting portion 22 is likewise provided with a channel 221. The channel 221 engages in particular in the first direction 8 with the cutout 220.

According to an exemplary embodiment, as shown in fig. 8, the base 20 has a snap-fit portion 200, the snap-fit portion 200 being configured to snap-fit the power pin 6 and/or the sensor pin for the motor 1. Whereby the power supply pins 6 and/or the sensor pins can be pre-positioned. The power supply pins 6 and the sensor pins are in particular mounted at one end to the circuit board 3 and at the other end to the interface portion 23 of the brush holder 2. In fig. 8 three catches 200 are exemplarily provided, but only one of the catches 200 is marked with a reference number. For the pre-positioning of the power supply pins 6 and/or the sensor pins, it is alternatively or additionally also conceivable for the base body 20 to have a pre-positioning groove 201 for the power supply pins 6 and/or the sensor pins. The power supply pin 6 and/or the sensor pin in particular have a preassembled section 60, wherein the preassembled section 60 is adapted to lie in a predetermined recess 201 of the base body 20 of the brush holder 2 and to be snapped in by the snap-in portion 200. By "flat" is understood, in particular, that the preassembled section 60 is applied to the base body 20 with a broad surface. By such a design, the pre-positioning groove 201 and the snap-in part 200 occupy only a small space in the first direction 8. The catch 200 is in particular in the form of a projection extending perpendicular to the first direction 8. The catch 200 may have a guiding ramp 202 to facilitate the snapping in of the pre-assembled section 60. As shown in fig. 4, the latch 200 and the predetermined slot 201 are particularly located on the first side of the base 20.

In the description, only the motor apparatus and the parts of the motor relevant to the present application are described. The motor apparatus and other parts of the motor, such as the stator, rotor, etc., are well known to those skilled in the art and will not be further described herein.

Although specific embodiments of the present application have been described in detail herein, they are presented for purposes of illustration only and are not to be construed as limiting the scope of the present application. Various substitutions, alterations, and modifications can be made without departing from the spirit and scope of the application.

List of reference numerals

1. Motor with a motor housing

10. Motor shell

11. Electric brush

2. Brush holder

20. Matrix body

200. Fastening part

201. Pre-positioning groove

202. Guide slope

21. A first mounting part

210. Notch

22. A second mounting part

220. Incision

221. Channel

23. Interface part

24. Housing part

3. Circuit board

30. Raised portion

4. Sensor for detecting a position of a body

5. Grounding pin

50. Clamping section

51. Bottom edge

52. Landing leg

6. Power supply pin

60. Preassembled section

7. Transmission device

70. Transmission housing

8. First direction

9. Pin pin

Claims

1. A brush holder for an electric motor, which is an electric motor for electrically adjusting a movable part in a vehicle, characterized in that the brush holder (2) comprises:

-a base body (20), the base body (20) being intended to cover a motor housing (10) of the motor (1) and having a first side facing away from the motor housing (10);

a first cylindrical mounting portion (21), the first mounting portion (21) being provided on a first side of the base body (20);

wherein the outer periphery of the first mounting portion (21) is provided with a notch (210), the first mounting portion (21) being configured to allow a circuit board (3) for the motor (1) to be fitted over the first mounting portion (21) and to be caught in the notch (210) with a convex portion (30) of the circuit board (3).

2. Brush holder for an electric motor according to claim 1, characterized in that the base body (20) has a through hole (203), the brush holder (2) being configured to allow a sensor (4) for the electric motor (1) mounted to a raised portion (30) of the circuit board (3) to pass through the base body (20) by means of the through hole (203).

3. The brush holder for an electric machine according to claim 2, characterized in that the brush holder comprises at least one of the following features:

the notch (210) is communicated with the through hole (203);

the brush holder (2) includes an interface portion (23) for plugging an external terminal, and the notch (210) is located adjacent to the interface portion (23) on an outer periphery of the first mounting portion (21).

4. A brush holder for an electric motor according to any of claims 1-3, characterized in that the brush holder (2) comprises a second mounting portion (22), which second mounting portion (22) is provided at a second side of the base body (20) facing the motor housing (10) and is intended to be snapped into the motor housing (10), which second mounting portion (22) has a cutout (220) and/or a channel (221) for pre-loading a grounding pin (5) for connecting the circuit board (3) with the motor housing (10), a direction from the second side across the base body (20) to the first side being referred to as a first direction (8), which cutout (220) cuts into the second mounting portion (22) in the first direction (8) and is configured to allow the grounding pin (5) to enter into the second mounting portion (22) via the cutout (220), which channel (221) extends parallel to the first direction (8) and is configured to accommodate the grounding pin (5).

5. A brush holder for an electric machine according to any one of claims 1 to 3, characterized in that the brush holder (2) comprises at least one of the following features:

the base body (20) has a snap-in part (200), the snap-in part (200) being configured to be adapted to snap-in a power supply pin (6) and/or a sensor pin for the motor (1);

the base body (20) has a pre-positioning groove (201), the pre-positioning groove (201) being configured to be adapted to pre-position a power pin (6) and/or a sensor pin for the motor (1).

6. An electric motor, characterized in that the electric motor (1) comprises a circuit board (3) and a brush holder for an electric motor according to any one of claims 1 to 5, the circuit board (3) being fitted around a first mounting portion (21) of the brush holder (2) and being snapped into a recess (210) of the first mounting portion (21) with a protruding portion (30).

7. An electric motor, characterized in that the electric motor (1) comprises a circuit board (3), a sensor (4) and a brush holder for an electric motor according to claim 2 or 3, the sensor (4) being mounted to a raised portion (30) of the circuit board (3) and penetrating through the base body (20) via a through hole (203) of the base body (20) of the brush holder (2).

8. An electric machine according to claim 7, characterized in that the sensor (4) is a hall sensor.

9. An electric motor, characterized in that the electric motor (1) comprises a grounding pin (5) and a brush holder for an electric motor according to claim 4, the grounding pin (5) having a U-shaped clamping section (50) for clamping to a cutout (220) of a second mounting portion (22) of the brush holder (2) and/or to a channel (221), the U-shaped clamping section (50) comprising two legs (52) and a bottom edge (51) connecting the two legs (52), the bottom edge (51) passing through the cutout (220) and/or the legs (52) clamping to the channel (221).

10. An electric machine according to claim 9, characterized in that the grounding pin (5) is circular in cross section.

11. An electric motor, characterized in that the electric motor (1) comprises a brush holder for an electric motor according to claim 5, the electric motor (1) further comprising a power pin (6) and/or a sensor pin, the power pin (6) and/or the sensor pin having a pre-assembled section (60), the pre-assembled section (60) being adapted to lie in a pre-positioned groove (201) of a base body (20) of the brush holder (2) and to be snapped by a snap-fit portion (200).

12. An electric motor apparatus, characterized in that it comprises a transmission (7) and an electric motor according to any one of claims 6 to 11, the first mounting portion (21) of the brush holder (2) of the electric motor (1) being adapted to be inserted into a transmission housing (70) of the transmission (7).