Grounding structure of brake actuator

Abstract

The utility model belongs to the technical field of parking motors, and discloses a brake actuator grounding structure which comprises a parking motor, a brake actuator and a grounding device. The shell is made of a plastic material, the parking motor is installed in a containing cavity of the shell, and a metal lining used for being connected with a gearbox is arranged on the shell; the grounding assembly comprises a conductive sheet and a conductive elastic piece, the conductive sheet is embedded in the shell, one end of the conductive elastic piece presses against the metal end cover of the parking motor, the other end of the conductive elastic piece presses against the conductive sheet, the conductive sheet is connected or abutted against the metal lining, and the parking motor can be electrically connected with the gearbox through the grounding assembly and the metal lining. According to the grounding structure of the brake actuator, the overall weight can be reduced, reliable grounding of the parking motor is achieved, meanwhile, the sealing performance of the shell is guaranteed, the number of parts is reduced, and the production and assembly difficulty is lowered.

Description

Technical Field

[0001] This utility model relates to the field of parking motor technology, and in particular to a grounding structure for a brake actuator. Background Technology

[0002] With the trend of vehicle electrification, electromechanical braking has shown more significant advantages over hydraulic braking, such as more sensitive response, more energy-efficient and efficient, and can work seamlessly with motors to achieve efficient energy recovery, converting braking kinetic energy into electrical energy storage and improving driving range. Therefore, electromechanical braking is gradually becoming the development direction.

[0003] Currently, the grounding solution for parking brake motors simply involves pressing an elastic metal sheet against the cover plate outside the motor, which cannot guarantee the stability of the motor grounding. Furthermore, the cover plate must be made of metal, increasing the overall weight of the brake actuator.

[0004] Therefore, there is an urgent need for a grounding structure for brake actuators to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this utility model is to provide a grounding structure for a brake actuator that can reduce the overall weight, achieve reliable grounding of the parking motor, ensure the sealing of the housing, reduce the number of parts, and reduce the difficulty of production and assembly.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A grounding structure for a brake actuator is provided, comprising:

[0008] The parking motor has a metal end cap.

[0009] The housing is made of plastic, and the parking motor is installed in the housing cavity. The housing is provided with a metal bushing for connecting the gearbox.

[0010] The grounding assembly includes a conductive sheet and a conductive elastic element. The conductive sheet is embedded in the housing. One end of the conductive elastic element presses against the metal end cap, and the other end presses against the conductive sheet. The conductive sheet is connected to or abuts against the metal bushing. The parking motor can be electrically connected to the gearbox via the grounding assembly and the metal bushing.

[0011] As a preferred technical solution, a positioning post is provided on the inner side of the housing, and the conductive elastic element is sleeved on the positioning post.

[0012] As a preferred technical solution, the conductive sheet has a first connecting portion at one end in the length direction and a second connecting portion at the other end. The conductive elastic element presses against the first connecting portion, the first connecting portion is sleeved on the positioning post, and the second connecting portion is electrically connected to the metal bushing.

[0013] As a preferred technical solution, the second connecting part is configured as a ring structure, the second connecting part is sleeved on the metal bushing, the outer periphery of the metal bushing is provided with a stepped part extending circumferentially thereon, and the stepped part presses against the second connecting part along the axial direction of the metal bushing.

[0014] As a preferred technical solution, the inner ring of the second connecting part is provided with a plurality of limiting protrusions, which can abut against the outer peripheral wall of the metal bushing.

[0015] As a preferred technical solution, the conductive sheet further includes an embedding portion, the two ends of which are respectively connected to the first connecting portion and the second connecting portion, and the embedding portion is embedded in the housing.

[0016] As a preferred technical solution, the conductive sheet is integrally formed; or

[0017] The mounting portion is welded to or detachably connected to the first connecting portion and / or the second connecting portion.

[0018] As a preferred technical solution, the housing is provided with a positioning frame, which together with the housing forms a limiting cavity for installing the transmission gear set. The positioning frame is provided with a clearance through hole, through which the conductive elastic element and the positioning post pass.

[0019] As a preferred technical solution, the housing includes a lower housing and an upper housing, the receiving cavity is formed in the lower housing, the conductive sheet is embedded in the upper housing, and the upper housing can be locked to the top of the lower housing and sealed to the lower housing.

[0020] As a preferred technical solution, the conductive elastic element is a compression spring.

[0021] The beneficial effects of this utility model are:

[0022] The grounding structure for the brake actuator provided by this utility model uses a plastic housing to mount the parking motor, reducing the overall weight. The housing is connected to the gearbox via a metal bushing. A grounding component is installed inside the housing, including a conductive sheet and a conductive elastic element. The two ends of the conductive elastic element press against the metal end cap of the parking motor and the conductive sheet, respectively. The conductive sheet is also connected to or abuts against the metal bushing to electrically connect the parking motor and the metal housing of the gearbox, thus grounding the parking motor. On the one hand, by setting up the conductive elastic element, the elastic force can be used to maintain the electrical connection between the metal end cap and the conductive sheet, resulting in high grounding reliability. On the other hand, the conductive sheet is fixed to the housing by embedding, which reduces the number of parts and lowers the difficulty of production and assembly while ensuring the housing's sealing requirements. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the grounding structure of the brake actuator provided by this utility model;

[0024] Figure 2 This is an exploded view of the grounding structure of the brake actuator provided by this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the conductive sheet provided by this utility model;

[0026] Figure 4 This is a partial structural diagram of the grounding structure of the brake actuator provided by this utility model. Figure 1 ;

[0027] Figure 5 This is a partial structural diagram of the grounding structure of the brake actuator provided by this utility model. Figure 2 ;

[0028] Figure 6 This is a partial exploded view of the grounding structure of the brake actuator provided by this utility model;

[0029] Figure 7 This is a cross-sectional view of the connection between the conductive component and the upper shell provided by this utility model.

[0030] In the picture:

[0031] 1. Parking motor; 11. Metal end caps;

[0032] 2. Housing; 21. Lower housing; 22. Upper housing; 221. Positioning post; 222. Mounting through hole;

[0033] 3. Conductive sheet; 31. First connecting part; 311. Sleeve hole; 32. Second connecting part; 321. Limiting protrusion; 33. Embedding part;

[0034] 4. Conductive elastic element; 5. Metal bushing; 51. Stepped part; 6. Positioning bracket; 61. Clearance through hole; 7. Transmission gear set; 8. Sealing ring. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] like Figures 1-7As shown, this embodiment provides a brake actuator grounding structure, whose output end is connected to the gearbox, and the gearbox outputs power to drive the brake pads to move linearly. The gearbox housing is made of metal. The brake actuator grounding structure includes a parking motor 1, a housing 2, and a grounding assembly. The parking motor 1 is installed in the receiving cavity of the housing 2. The housing 2 is provided with a metal bushing 5 for connecting the gearbox. The grounding assembly is used to electrically connect the parking motor 1 and the metal bushing 5, thereby grounding the parking motor 1 using the metal housing of the gearbox.

[0040] Furthermore, such as Figures 1-7 As shown, the parking motor 1 is equipped with a metal end cap 11, and the housing 2 is made of plastic. The grounding component includes a conductive sheet 3 and a conductive elastic element 4. The conductive sheet 3 is embedded in the housing 2. One end of the conductive elastic element 4 presses against the metal end cap 11, and the other end presses against the conductive sheet 3. The conductive sheet 3 is connected to or abuts against the metal bushing 5. The parking motor 1 can be electrically connected to the gearbox through the grounding component and the metal bushing 5.

[0041] Specifically, in the brake actuator grounding structure provided in this embodiment, a plastic housing 2 is used to install the parking motor 1, reducing the overall weight. The housing 2 is connected to the gearbox via a metal bushing 5. A grounding assembly is provided inside the housing 2, including a conductive sheet 3 and a conductive elastic element 4. The two ends of the conductive elastic element 4 press against the metal end cap 11 of the parking motor 1 and the conductive sheet 3, respectively. The conductive sheet 3 is also connected to or abuts against the metal bushing 5 to electrically connect the parking motor 1 with the metal housing of the gearbox, thus achieving grounding. On the one hand, by providing the conductive elastic element 4, the elastic force can be used to maintain the electrical connection between the metal end cap 11 and the conductive sheet 3 of the parking motor 1, resulting in strong grounding reliability. On the other hand, the conductive sheet 3 is fixed to the housing 2 by embedding, which reduces the number of parts and lowers the difficulty of production and assembly while ensuring the sealing requirements of the housing 2.

[0042] For example, such as Figures 3-7 As shown, the conductive sheet 3 includes a first connecting part 31, a second connecting part 32, and an insert part 33. The first connecting part 31 is located at one end of the conductive sheet 3 along its length, the second connecting part 32 is located at the other end of the conductive sheet 3 along its length, the two ends of the insert part 33 are respectively connected to the first connecting part 31 and the second connecting part 32, the conductive elastic member 4 presses against the first connecting part 31 with its own elastic force, the second connecting part 32 is electrically connected to the metal bushing 5, and the insert part 33 is embedded in the housing 2.

[0043] For example, such as Figure 6 and Figure 7As shown, a positioning post 221 is provided on the inner side of the housing 2, and the conductive elastic element 4 is sleeved on the positioning post 221. The first connecting part 31 is provided with a sleeve hole 311, through which the first connecting part 31 is sleeved on the positioning post 221. By setting the positioning post 221, the installation position of the conductive elastic element 4 can be defined, and the rapid installation of the conductive elastic element 4 can be facilitated, reducing the installation difficulty and the risk of misinstallation, and improving assembly efficiency.

[0044] For example, such as Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, the housing 2 includes a lower housing 21 and an upper housing 22. The receiving cavity is formed in the lower housing 21, and the conductive sheet 3 is embedded in the upper housing 22. The upper housing 22 is locked to the top of the lower housing 21 by screws and is sealed to the lower housing 21. The positioning post 221 is integrally formed on the inner side of the upper housing 22, and the conductive sheet 3 is embedded in the upper housing 22.

[0045] For example, such as Figures 3-7 As shown, the second connecting part 32 is configured as an annular structure and is sleeved on the metal bushing 5. The outer periphery of the metal bushing 5 is provided with a stepped part 51 extending circumferentially. Along the axial direction of the metal bushing 5, the stepped part 51 presses against the second connecting part 32. Specifically, the upper shell 22 is provided with a mounting through hole 222, and the metal bushing 5 passes through the mounting through hole 222. The setting of the stepped part 51 can not only limit the axial installation position between the metal bushing 5 and the upper shell 22, but also achieve a large-area contact with the second connecting part 32. By pressing the second connecting part 32, the conductive sheet 3 is stably installed and protected. The assembly between the two does not need to be achieved through interference fit, resulting in a longer service life.

[0046] For example, such as Figures 3-7 As shown, the inner ring of the second connecting portion 32 is provided with a plurality of limiting protrusions 321, which can abut against the outer peripheral wall of the metal bushing 5. In this embodiment, the inner ring of the second connecting portion 32 is provided with four limiting protrusions 321, which are distributed at intervals along the inner ring of the second connecting portion 32. The limiting protrusions 321 protrude toward the center of the second connecting portion 32, which can limit the radial position of the second connecting portion 32 and increase the electrical connection points with the metal bushing 5.

[0047] For example, such as Figures 3-7 As shown, the mounting part 33 is configured as a concave structure, with its main body embedded in the upper shell 22, and its two ends protruding from the upper shell 22 to connect the first connecting part 31 and the second connecting part 32.

[0048] For example, the conductive sheet 3 is integrally formed; or, the insert portion 33 is welded to or detachably connected to the first connecting portion 31 and / or the second connecting portion 32. In this embodiment, the insert portion 33 is integrally formed with the first connecting portion 31, and the insert portion 33 is welded to the second connecting portion 32.

[0049] In some embodiments, the conductive elastic element 4 can also be directly connected to the conductive sheet 3 and the metal end cap 11 through a structure such as a snap fastener, and the second connecting part 32 can also be directly connected to the metal bushing 5 through a structure such as a snap fastener, so as to further improve the stability of the connection.

[0050] For example, such as Figure 2 , Figure 6 and Figure 7 As shown, a positioning frame 6 is provided inside the housing 2. The positioning frame 6 and the housing 2 enclose a limiting cavity for installing the transmission gear set 7. The positioning frame 6 is provided with an avoidance through hole 61. The conductive elastic element 4 and the positioning post 221 are both inserted through the avoidance through hole 61.

[0051] In this embodiment, the conductive elastic element 4 is a compression spring. In other embodiments of this invention, the conductive elastic element 4 may also be a tension spring or other elastic structure.

[0052] For example, such as Figure 2 and Figure 6 As shown, the upper shell 22 has an annular sealing groove arranged circumferentially on the side facing the lower shell 21. The brake actuator grounding structure also includes a sealing ring 8, which is installed in the sealing groove to seal the gap between the lower shell 21 and the upper shell 22, so that the shell 2 meets the protection levels of IP6K7 and IP6KP9.

[0053] For example, the materials of the metal end cap 11, the conductive elastic element 4, and the conductive sheet 3 can be selected as metals with excellent conductivity, such as copper alloys.

[0054] For example, the material of the metal bushing 5 can be selected from metals with excellent electrical conductivity such as aluminum alloy and copper alloy.

[0055] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A grounding structure for a brake actuator, characterized in that, include: The parking motor (1) is equipped with a metal end cap (11); The housing (2) is made of plastic. The parking motor (1) is installed in the cavity of the housing (2). The housing (2) is provided with a metal bushing (5) for connecting the gearbox. The grounding assembly includes a conductive sheet (3) and a conductive elastic element (4). The conductive sheet (3) is embedded in the housing (2). One end of the conductive elastic element (4) presses against the metal end cap (11), and the other end presses against the conductive sheet (3). The conductive sheet (3) is connected to or abuts against the metal bushing (5). The parking motor (1) can be electrically connected to the gearbox via the grounding assembly and the metal bushing (5).

2. The grounding structure for the brake actuator according to claim 1, characterized in that, The inner side of the housing (2) is provided with a positioning post (221), and the conductive elastic element (4) is sleeved on the positioning post (221).

3. The grounding structure for the brake actuator according to claim 2, characterized in that, The conductive sheet (3) has a first connecting part (31) at one end in the length direction and a second connecting part (32) at the other end. The conductive elastic element (4) presses against the first connecting part (31). The first connecting part (31) is sleeved on the positioning post (221). The second connecting part (32) is electrically connected to the metal bushing (5).

4. The brake actuator grounding structure according to claim 3, characterized in that, The second connecting part (32) is configured as an annular structure. The second connecting part (32) is sleeved on the metal bushing (5). The outer periphery of the metal bushing (5) is provided with a step part (51) extending in its circumferential direction. Along the axial direction of the metal bushing (5), the step part (51) presses against the second connecting part (32).

5. The grounding structure for the brake actuator according to claim 4, characterized in that, The inner ring of the second connecting part (32) is provided with a plurality of limiting protrusions (321), which can abut against the outer peripheral wall of the metal bushing (5).

6. The grounding structure for the brake actuator according to claim 3, characterized in that, The conductive sheet (3) further includes an insert (33), the two ends of which are respectively connected to the first connecting part (31) and the second connecting part (32), and the insert (33) is embedded in the housing (2).

7. The brake actuator grounding structure according to claim 6, characterized in that, The conductive sheet (3) is integrally formed; or The mounting portion (33) is welded to or detachably connected to the first connecting portion (31) and / or the second connecting portion (32).

8. The grounding structure for the brake actuator according to claim 2, characterized in that, The housing (2) is provided with a positioning frame (6), which together with the housing (2) forms a limiting cavity for installing the transmission gear set (7). The positioning frame (6) is provided with a clearance through hole (61), and the conductive elastic element (4) and the positioning post (221) are both inserted through the clearance through hole (61).

9. The brake actuator grounding structure according to any one of claims 1-8, characterized in that, The housing (2) includes a lower shell (21) and an upper shell (22). The receiving cavity is formed in the lower shell (21), and the conductive sheet (3) is embedded in the upper shell (22). The upper shell (22) can be locked to the top of the lower shell (21) and is sealed to the lower shell (21).

10. The brake actuator grounding structure according to any one of claims 1-8, characterized in that, The conductive elastic element (4) is a compression spring.

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