Electromechanical brake

Abstract

The application provides an electromechanical brake. The electromechanical brake comprises a main brake module and a brake execution module; when the main brake module and the brake execution module are assembled, a cover wall of the brake execution module is inserted into a notch of the main brake module, so that the outer wall is positioned around the cover wall and the motor is in transmission connection with the main shaft. The electromechanical brake according to the embodiment is reasonable in design and convenient to assemble.

Description

Technical Field

[0001] This application relates to the field of braking devices, and more specifically, to an electromechanical brake. Background Technology

[0002] Electromechanical brakes are devices that achieve braking by using a motor to drive the brake caliper. Compared to traditional hydraulic brakes, they offer advantages such as faster response, simpler structure, and easier maintenance. With the increasing electrification and intelligence of vehicles, electromechanical brakes are becoming a development trend in braking systems due to their easier integration with electric control systems.

[0003] Electromechanical brakes are generally assembled from a first module and a second module. The first module includes a brake motor, a transmission mechanism, and a control unit, while the second module includes a housing and friction pad supports, etc. Given the large number of internal components, designing an electromechanical brake that is easy to assemble is a challenge. Summary of the Invention

[0004] The purpose of this application is to solve or at least alleviate one or more problems existing in the prior art.

[0005] According to one aspect, an electromechanical brake is provided, comprising: The main braking module includes: a motor, an electronic control unit, and a housing, the housing including an outer wall defining a recess; and A braking actuator module includes a housing, the housing including a housing wall defining a cavity, an actuator assembly disposed in the cavity, the actuator assembly including a main shaft supported by a bearing on the inner side of the housing wall; During the assembly of the main braking module and the braking execution module, the housing wall of the braking execution module is inserted into the recess of the main braking module, such that the outer wall is positioned around the housing wall and the motor is connected to the main shaft for transmission.

[0006] The electromechanical brake according to the embodiment is reasonably designed and easy to assemble. Attached Figure Description

[0007] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. In addition, similar numbers in the diagram are used to represent similar components, where: Figure 1 An exploded view of the electromechanical brake according to an embodiment being assembled to a wheel hub is shown; Figure 2 A perspective view of an electromechanical brake according to an embodiment is shown; Figure 3 An exploded view of an electromechanical brake according to an embodiment is shown; Figure 4 A longitudinal cross-sectional view of an electromechanical brake according to an embodiment is shown; Figure 5 A perspective view of the housing of an electromechanical brake according to an embodiment is shown; Figure 6 A cross-sectional view of the housing of an electromechanical brake according to an embodiment is shown; Figure 7 A longitudinal cross-sectional view of the housing of an electromechanical brake according to an embodiment is shown; Figure 8 A perspective view of the bearing and retaining ring of an electromechanical brake according to an embodiment is shown; Figure 9 A partial longitudinal cross-sectional view of an electromechanical brake according to one embodiment is shown; Figure 10 It shows Figure 9 A three-dimensional diagram of the elastic component in the diagram; Figure 11 A partial longitudinal cross-sectional view of an electromechanical brake according to another embodiment is shown; Figure 12 It shows Figure 11 A three-dimensional diagram of the elastic component in the diagram; Figure 13 and Figure 14 Perspective views of the housing of the main braking module according to the embodiment are shown from different angles; Figure 15 A cross-sectional view of the housing of the main braking module according to an embodiment is shown; Figure 16 A longitudinal cross-sectional view of the assembly process of the electromechanical brake according to an embodiment is shown; Figure 17 A cross-sectional view of an electromechanical brake according to an embodiment is shown; and Figure 18 It shows Figure 17 A magnified view of region A in the image. Detailed Implementation

[0008] Figure 1An installation diagram of an electromechanical brake is shown, illustrating a shaft 91, a shock absorber 92, a bearing 94, a steering knuckle arm 93, a brake disc 95, and a wheel 96, as well as an electromechanical brake 100 according to an embodiment, which is driven by a motor to provide braking force by clamping the brake disc 95 with a brake caliper. During assembly, the electromechanical brake 100 is mounted on the steering knuckle arm 93, and is also housed within a compact space inside the wheel hub of the wheel 96, thus imposing strict limitations on the volume of the electromechanical brake 100 itself.

[0009] refer to Figures 2 to 18 To describe electromechanical brakes according to various embodiments. For example... Figure 2 and Figure 3 As shown, the electromechanical brake includes a brake actuation module 1 and a main brake module 2. The main brake module 2 may include a motor (only the motor's output shaft 31 is visible in the figure), an electronic control unit 4, and a housing. The housing includes an outer wall 21 defining a recess 20. The electronic control unit 4 can be mounted at one end of the housing and can be connected to the vehicle via a wiring harness to receive brake control signals and to the motor to control the motor to output appropriate braking torque. The brake actuation module 1 may include a housing 11, a brake caliper composed of friction pads and friction pad supports, and an actuation assembly. The housing 11 includes a housing wall 12 defining a cavity 120, in which an actuation assembly is disposed. The actuation assembly includes a main shaft 4 supported by a bearing 5 on the inner side of the housing wall 12. Figure 4 As shown in the longitudinal section view, when the main braking module 1 and the braking execution module 2 are assembled, the housing wall 12 of the braking execution module is inserted into the recess 20 of the main braking module 2, so that the outer wall 21 is positioned around the housing wall 12 and the motor, such as its output shaft 31, is connected to the main shaft 4 for transmission.

[0010] Both the outer wall 21 and the housing wall 12 may be cylindrical, and when the outer wall 21 surrounds the housing wall 12, the two are tightly joined, with only an assembly gap. The outer wall 21 and the housing wall 12 can be connected by any suitable means, such as welding, bonding, etc. In some embodiments, reference is made to... Figures 5 to 7 The outer surface of the housing wall 12 has a first groove 62 along the circumference. The outer wall 21 is deformed to fill the first groove 62, thereby connecting the main braking module 1 and the braking actuation module 2. This process is also known as caulking or crimping. In some embodiments, refer to Figure 17 and Figure 18 The outer surface of the outer wall 21 includes at least one protruding rib 23, which aligns with the first groove 62 when the at least one protruding rib 23 on the outer surface of the outer wall 21 is aligned. Figure 18In a specific configuration (e.g., a force is applied to at least one of the protruding ribs 23), causing the at least one protruding rib 23 to deform into the first groove 62, thereby achieving a connection. To achieve this connection, the outer wall 21 can be made of an aluminum-based material or other metal or non-metal material with good deformability, and the deformation can be achieved by pressing with a pressure head. The pressing process, for example, involves pressing the protruding rib 23 into the first groove 62 at a single point with the pressure head, followed by rotating the assembly to press the entire protruding rib 23 into the first groove 62.

[0011] Continue to refer to Figures 5 to 7 In some embodiments, the outer surface of the housing wall has a second circumferential groove 61, parallel to the first groove 62, and a first seal 81, such as a sealing ring, is arranged in the second groove 61 to seal the gap between the housing wall 12 and the outer wall 21. In the illustrated embodiment, the first groove 62 is closer to the end or further out than the second groove 61. In some embodiments, the outer surface of the housing wall 12 also includes circumferential anti-rotation teeth 63, which are interference-fitted into the recesses 20 of the outer wall 21. The anti-rotation teeth 63 achieve circumferential restraint between the two by interference fit with the outer wall 21, and axial restraint between the two by the aforementioned caulking and riveting. In the illustrated embodiment, the anti-rotation teeth 63 are further out or closer to the end than the first groove 62. The anti-rotation teeth 63 can be formed by a cylindrical scraper acting on the outside of the housing wall 12, and in some embodiments, the anti-rotation teeth can be formed by two processes: coarse scraping and fine scraping. Although the anti-rotation tooth 63 is formed along the entire circumference in the illustrated embodiment, in alternative embodiments, the anti-rotation tooth 63 may occupy only one or more arcuate segments. The arrangement of the first groove 62, the second groove 61, and the anti-rotation tooth 63 on the outer side of the housing wall 12 enables limiting and sealing between the housing wall 12 and the outer wall 21.

[0012] Before the main braking module 1 and the braking actuation module 2 are assembled, the actuation component needs to be assembled with the housing. In some embodiments, the inner surface of the housing wall 12 includes a third groove 64 along the circumference, and the bearing 5 is engaged with the third groove 64 by a retaining ring 51. More specifically, as Figure 8 As shown, the outer ring of bearing 5 has a retaining ring groove. A retaining ring 51 can be compressed into the retaining ring groove and inserted into the inner side of the housing wall 12 along with the bearing. The retaining ring 51 unfolds at the third groove 64, thereby achieving axial positioning of bearing 5. Figure 9As clearly shown, the inner diameter of the third groove 64 is configured such that the retaining ring 51, when the third groove 64 is deployed, still radially overlaps with the third groove 64 and the retaining ring groove. In some embodiments, the inner surface of the housing wall 12 further includes a boss 650, the boss 650 including a first shoulder 65 facing the third groove 64, and an elastic member 52 disposed between the first shoulder 65 and the bearing 5. The provision of the elastic member 52 will provide an outward thrust to the outer ring 501 of the bearing 5, while the retaining ring 51 will prevent the outer ring 501 of the bearing 5 from moving outward, thereby achieving axial positioning of the bearing 5. The bearing 5 may be a thrust bearing. In some embodiments, a fourth groove 66 is provided at the first shoulder 65 in the circumferential direction, and the elastic member 52 can be embedded in the fourth groove 66. Figure 9 and Figure 10 As shown, in some embodiments, the elastic member 52 may be an elastic washer, which may include, for example, an annular body 520 embedded in the fourth groove 66 and a plurality of spaced protrusions 521 extending from the annular body 520 toward the bearing 5. Figure 11 and Figure 12 As shown, in an alternative embodiment, the elastic member 52 may be a wave spring 52'. A portion of the wave spring 52' is embedded in the fourth groove 66, and a portion of the wave spring 52' provides elastic force to the bearing 5. In other alternative embodiments, the elastic member 52 may also be a disc spring, a coil spring, etc.

[0013] Continue to refer to Figure 3In some embodiments, the main shaft 4 includes a first end 45 and a second end 41 opposite to each other. The first end 45 of the main shaft 4 extends out of the housing wall 12 and is fixedly connected to the input gear 43. The second end 41 of the main shaft is formed as the screw of a ball screw mechanism, and the nut 42 of the ball screw mechanism is connected to the end plate assembly 44. The input gear 43 receives input torque from the motor and converts it into translation of the end plate assembly 44 via the ball screw mechanism. In some embodiments, the input gear 43 is constructed as a worm gear, and the output shaft 31 of the motor is constructed as a worm and extends into the recess 20. When the main braking module 2 is assembled with the braking actuation module 1, the worm gear 43 enters the recess 20 to mesh with the output shaft 31 of the motor. The worm gear structure allows the motor to be arranged transversely to the main shaft 4, thereby making better use of the compact space. In an alternative embodiment, the input gear 43 may be a conventional gear, and the motor output shaft 31 may be arranged parallel to the main shaft 4 and mesh with the input gear 43 via a gear. In some embodiments, the input gear 43 may include an inner ring 431 made of a first material and an outer ring 432 made of a second material. The inner ring 431 may be made of metal, for example, to improve its connection strength with the main shaft, while the outer ring may be made of plastic or the like. Through this mechanism, the rotation of the motor output shaft 31 is converted into translation of the end plate assembly 44. For example, if the motor rotates in a first direction, the end plate assembly 44 moves towards the first friction plate 71; if the motor rotates in a second direction opposite to the first direction, the end plate assembly 44 moves away from the first friction plate 71. The rotation of the motor is controlled by the electronic control unit 4, which controls the motor according to the vehicle's braking requirements to provide the necessary braking torque.

[0014] In some embodiments, the inner surface of the housing wall 12 further includes a fifth groove 68 circumferentially arranged therein, in which a sliding bearing 54 is disposed to guide the axial sliding of the nut 42. In some embodiments, the fifth groove 68 may be provided on the boss 650. In some embodiments, the inner surface of the housing wall further includes at least one anti-rotation groove 67 axially, and the outer surface of the nut 42 includes a protrusion, such as a slider, that engages with the anti-rotation groove 67. In the illustrated embodiment, a pair of anti-rotation grooves 67 are provided. As shown, the anti-rotation groove 67 may also be provided on the boss 650, for example, traversing the entire boss 650. In some embodiments, the boss 650 includes a second shoulder 651 facing the first friction piece 71, wherein a sixth groove 69 circumferentially is provided on the front side of the second shoulder 651, and a second seal 82 is embedded in the sixth groove 69 to provide a seal between the nut 42 and the housing wall 12. The second seal 82 is a U-shaped sealing ring and includes a skeleton 820 and an elastic cover 821, such as a rubber cover, formed on the skeleton.

[0015] Continue to refer to Figures 13 to 15The diagram shows the housing of the main braking module 2. The housing of the main braking module 2 includes an outer wall 21 and an additional housing portion 27 connected to the outer wall. The additional housing portion 27 includes an open top 24. The additional housing portion 27 is used to house the motor, and its open top 24 is covered by the electronic control unit 4. Figure 13 As shown, a space 201 for arranging the motor output shaft is provided on one side of the recess 20. Furthermore, in the illustrated embodiment, the outer wall 21 includes two protruding ribs 231 and 232 on both sides, which are arranged opposite to each other. Figure 15 As can be seen, the inner wall of the notch 20 is divided into multiple sections, including an inlet guide section 251, a first section 252, a transition guide section 254, and a second section 253. The second section 253 has a tapered diameter for interference fit with the anti-rotation teeth of the housing wall 12. The transition guide section 254 guides the entry of the anti-rotation teeth, and the first section 252 mates with the first groove 62 and the second groove 61. The housing 21 of the main braking module 2 may be made of an aluminum-based material.

[0016] like Figure 16 As shown, before assembly, the sliding bearing 54 and the elastic member 52 are first assembled to the housing wall 12. The spindle 4 is also connected to the bearing 5, such as by an interference fit to the inner ring 502 of the bearing, and then the input gear 43 is installed to the spindle 4. Then the assembly of the spindle 4 and the bearing 5 is inserted into the housing wall 12 together and fixed in place by the retaining ring 51.

[0017] In some embodiments, the braking actuation module further includes a friction pad bracket 112, which includes mounting holes 1121 for secure mounting on a vehicle. A first friction pad 71 and a second friction pad 72 are disposed on the friction pad bracket 112 and are movable along the friction pad bracket 112. A housing 11 is slidably mounted on the friction pad bracket 112, and a cavity 120 of the housing 11 opens to the first friction pad 71, allowing the end plate assembly 44 to act on the first friction pad 71.

[0018] In some embodiments, the housing 11 includes a housing body 110 covering the first friction plate 71 and the second friction plate 72, and the outer end of the housing body 110 ( Figure 4 The left side of the casing 110 has a hook 111 that acts on the second friction plate 72, and a cylindrical cover wall 12 is provided at the inner end of the cover body 110. Figure 5As shown, the inner ends of the housing body 110 have a pair of flanges 113, each flange 113 including mounting holes 114, thereby connecting to a first guide pin and a second guide pin that are parallel to each other. The housing 11 is slidably mounted into a pair of guide holes 122 of the friction plate support 112 via the first guide pin and the second guide pin, thereby allowing the housing 11 to be movably mounted to the friction plate support 112 relative to the friction plate support 112. Furthermore, the housing wall 12 is integrally formed with the housing body 110. Compared to a separate housing wall 12, this design reduces the number of parts and simplifies the assembly process. For the specific structure and operation of the electromechanical brake, please refer to Chinese Invention Patent Application Publication No. CN117267280A entitled "Electromechanical Brake," the entire contents of which are incorporated herein by reference. The electromechanical brake according to the embodiments of this application achieves a reasonable design of the main braking module 2 and the brake caliper module 1, facilitating their assembly.

[0019] The specific embodiments described above are merely for the purpose of more clearly illustrating the principles of this application, wherein various components are clearly shown or described to make the principles of the invention easier to understand. Various modifications or variations can be easily made to this application by those skilled in the art without departing from the scope of this application. Therefore, it should be understood that all such modifications or variations should be included within the patent protection scope of this application.

Claims

1. An electromechanical brake, comprising: The main braking module (2) includes: a motor, an electronic control unit, and a housing, the housing including an outer wall (21) defining a notch (20); and Braking execution module (1), the braking execution module (1) includes a housing (11), the housing (11) includes a housing wall (12) defining a cavity (120), an execution component is disposed in the cavity (120), the execution component includes a main shaft (4) supported by a bearing (5) on the inner side of the housing wall (12); When the main braking module (1) and the braking execution module (2) are assembled, the cover wall (12) of the braking execution module (1) is inserted into the recess (20) of the main braking module, so that the outer wall (21) is positioned around the cover wall (12) and the motor is connected to the main shaft (4) for transmission.

2. The electromechanical brake according to claim 1, characterized in that, The outer surface of the casing wall (12) has a first groove (62) along the circumferential direction. The outer wall (21) is deformed to fill the first groove (62), thereby connecting the main braking module (2) with the braking execution module (1). The outer surface of the outer wall (21) includes at least one protruding rib (23). When the at least one protruding rib (23) on the outer surface of the outer wall (21) is aligned with the first groove (62), a force is applied to the at least one protruding rib (23) so that the at least one protruding rib (23) deforms toward the first groove (62) to fill the first groove (62).

3. The electromechanical brake according to claim 2, characterized in that, The outer surface of the casing wall has a second groove (61) along the circumferential direction, the second groove (61) being parallel to the first groove (62) and a first seal (81) being arranged in the second groove (61) to seal the gap between the casing wall (12) and the outer wall (21).

4. The electromechanical brake according to claim 2, characterized in that, The outer surface of the casing wall (12) also includes circumferential anti-rotation teeth (63), which are interference-fitted into the recess (20) of the outer wall (21).

5. The electromechanical brake according to claim 2, characterized in that, The inner surface of the casing wall (12) includes a third groove (64) along the circumferential direction, and the bearing (5) is fitted to the third groove (64) by a retaining ring (51); The inner surface of the cover wall (12) further includes a boss (650), the boss (650) includes a first shoulder (65) facing the third groove (64), and an elastic member (52) is disposed between the first shoulder (65) and the bearing (5). The first shoulder (65) is provided with a fourth groove (66) along the circumference, and the elastic member (52) is an elastic washer or wave spring embedded in the fourth groove (66).

6. The electromechanical brake according to any one of claims 1-5, characterized in that, The portion where the outer wall (21) and the cover wall (12) meet is cylindrical. The main shaft (4) includes a first end (45) and a second end (41) opposite to each other. The first end (45) of the main shaft (4) extends out of the cover wall (12) and is fixedly connected to the input gear (43). The second end (41) of the main shaft is formed as the screw of the ball screw mechanism, and the nut (42) of the ball screw mechanism is connected to the end plate assembly (44). The input gear (43) is constructed as a worm gear, and the output shaft (31) of the motor is constructed as a worm and extends to the recess (20). When the main braking module and the braking execution module are assembled, the worm gear enters the recess (20) to mesh with the output shaft (31).

7. The electromechanical brake according to claim 6, characterized in that, The inner surface of the casing wall also includes a fifth groove (68) along the circumferential direction, in which a sliding bearing (54) is arranged to guide the axial sliding of the nut (42); The inner surface of the cover wall also includes at least one anti-rotation groove (67) along the axial direction, and the outer surface of the nut (42) includes a protrusion that fits into the anti-rotation groove (67); The inner surface of the cover wall (12) further includes a boss (650), and the fifth groove (68) and the at least one anti-rotation groove (67) are disposed on the boss (650).

8. The electromechanical brake according to claim 6, characterized in that, The braking execution module further includes a friction plate bracket (112), a first friction plate (71) and a second friction plate (72) are disposed on the friction plate bracket (112), the cover (11) is slidably mounted on the friction plate bracket (112), and the cavity (120) is connected to the first friction plate (71) so that the end plate assembly (44) can act on the first friction plate (71).

9. The electromechanical brake according to claim 8, characterized in that, The cover (11) includes a cover body (110) covering the first friction plate (71) and the second friction plate (72). The outer end of the cover body (110) has a hook (111) that acts on the second friction plate (72). A cylindrical cover wall (12) is disposed at the inner end of the cover body (110). The inner end of the cover body has a pair of flanges (113) on both sides. The pair of flanges (113) are respectively connected to a first guide pin and a second guide pin that are parallel to each other. The cover (11) is slidably mounted to the friction plate bracket (112) through the first guide pin and the second guide pin. The cover wall (12) is integrally formed with the cover body (110).

10. The electromechanical brake according to claim 6, characterized in that, The inner surface of the housing wall (12) further includes a boss (650), the boss (650) including a second shoulder (651) facing the first friction plate (71), wherein the front side of the second shoulder (651) is provided with a sixth groove (69) along the circumference, and a second seal (82) is embedded in the sixth groove (69) to provide a seal between the nut (42) and the housing wall (12), wherein the second seal (82) is U-shaped and includes a skeleton and an elastic cover formed on the skeleton.

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