Electromechanical brake and vehicle

Abstract

The utility model discloses an electronic mechanical brake, include: non -metal casing, lid, lid is located non -metal casing to form the installation cavity, circuit board, be located in the installation cavity, and circuit board is equipped with grounding piece, metal support plate, be located in the installation cavity, with the electric connection of grounding piece, motor, be located non -metal casing outside, and the motor includes metal motor shell, and metal motor shell surface is equipped with first metal conductive sheet and second metal conductive sheet, metal pin, be located in the installation cavity, and the top of metal pin is electrically connected with metal support plate, and the bottom end passes through non -metal casing and is electrically connected with first metal conductive sheet, calliper assembly is used for electrically connected in vehicle body, and calliper assembly is electrically connected with second metal conductive sheet, the utility model discloses can conductive metal support plate and metal motor shell to the metal motor shell through calliper electric connection to vehicle, need not increase additional grounding wire, and the grounding structure is simple, and the cost is lower, the utility model discloses still provides a kind of vehicle.

Description

Technical Field

[0001] This utility model relates to the field of brake technology, and in particular to an electromechanical brake and vehicle. Background Technology

[0002] In the technological evolution of automotive braking systems, electromechanical brakes (EMBs) have become crucial for improving vehicle braking performance and safety due to their advantages such as rapid response, precise control, and simplified structure. An electromechanical brake consists of a controller box and a motor, with the controller box housing a printed circuit board assembly (PCBA). The stable operation of the controller box and motor relies heavily on a reliable grounding design, which is essential for preventing static electricity buildup, avoiding circuit interference, and ensuring system safety.

[0003] Currently, the grounding structure design of electromechanical brakes is closely related to the choice of housing material. In some applications, to meet requirements for lightweighting, corrosion resistance, or specific structural design, the housing of the electromechanical brake may be made of plastic. In this case, since plastic itself is not conductive, it cannot directly achieve grounding. Existing technologies require designing a separate grounding wire on the plastic housing or using a special grounding spring pin, which undoubtedly increases the complexity of the housing mold, and raises the processing difficulty and cost. Therefore, how to optimize the grounding structure design to balance reliability, cost, and process complexity for different choices of electromechanical brake housing materials has become an urgent technical problem to be solved in this field. Utility Model Content

[0004] The purpose of this invention is to solve the problem that when the housing of an electromechanical brake is made of plastic, the cost and manufacturing process of a separate grounding structure are high. This invention provides an electromechanical brake and vehicle that utilizes a metal pin to conduct the metal support plate and the metal motor housing, and electrically connects the metal motor housing to the vehicle via calipers, eliminating the need for additional grounding wires, thus simplifying the grounding structure and reducing costs.

[0005] To solve the above-mentioned technical problems, an embodiment of this utility model discloses an electromechanical brake, comprising:

[0006] Non-metallic casing;

[0007] A cover is provided on the non-metallic shell to form an installation cavity;

[0008] A circuit board is disposed within the mounting cavity, and the circuit board is provided with a grounding component;

[0009] A metal support plate is disposed in the mounting cavity, located below the circuit board, and electrically connected to the grounding component;

[0010] An electric motor is disposed outside the non-metallic housing. The electric motor includes a metal motor housing, and the outer surface of the metal motor housing is provided with a first metal conductive sheet and a second metal conductive sheet.

[0011] A metal pin is disposed in the mounting cavity. The top end of the metal pin is electrically connected to the metal support plate, and the bottom end passes through the non-metallic shell and is electrically connected to the first metal conductive sheet.

[0012] A caliper assembly for electrical connection to a vehicle body, the caliper assembly being electrically connected to the second metal conductive plate.

[0013] The above technical solution places the circuit board, metal pin, and motor within a non-metallic housing. Two metal conductive plates are installed on the metal motor housing. First, a grounding component connects the circuit board and the metal support plate. Then, the metal pin connects the metal support plate and the first metal conductive plate on the metal motor housing. The first metal conductive plate connects to the second metal conductive plate through the metal motor housing. Finally, the second metal conductive plate is electrically connected to the vehicle body via a caliper assembly. This sequentially connects the circuit board, metal support plate, metal pin, first metal conductive plate, motor, second metal conductive plate, caliper assembly, and vehicle body, achieving electrical connection between the circuit board and the metal motor housing and the vehicle body, thus realizing the grounding design of the circuit board and motor. Without altering the electromechanical brake layout, no additional conductive grounding structure is needed on the non-metallic housing, resulting in a simple structure and low cost.

[0014] According to another specific embodiment of the present invention, an electromechanical brake is disclosed. The caliper assembly includes a metal caliper housing, a metal guide pin screw, and a metal caliper bracket. The metal caliper housing and the metal caliper bracket are connected by the metal guide pin screw. The metal caliper housing is electrically connected to the second metal conductive plate. The metal caliper bracket is provided with a vehicle body electrical connector for electrical connection with the vehicle body.

[0015] By adopting the above technical solution, a metal guide pin screw is set between the metal caliper housing and the metal caliper bracket of the caliper assembly to make a conductive connection between the metal caliper housing and the metal caliper bracket, ensuring that a continuous conductive path is formed inside the caliper assembly, and realizing reliable grounding between the caliper assembly and the vehicle body through the vehicle body electrical connector, enhancing the overall anti-static capability, and thus realizing the electrical connection between the circuit board and the metal motor housing and the vehicle body through the caliper assembly.

[0016] According to another specific embodiment of the present invention, an electromechanical brake is disclosed, which further includes:

[0017] A reduction gear system is provided in the mounting cavity, and the reduction gear system and the circuit board are located on opposite sides of the metal support plate. The reduction gear system includes a planetary gear system and a reduction gear unit.

[0018] A clamping device is disposed within the metal caliper housing;

[0019] The motor includes an output shaft and a motor gear disposed on the output shaft. The motor gear is disposed in the mounting cavity and meshes with a reduction gear unit and a planetary gear train in sequence. The planetary gear train is connected to the clamping device for transmission.

[0020] By adopting the above technical solution, the circuit board and reduction gear system are housed within the mounting cavity between the non-metallic housing and the cover. Since the circuit board and reduction gear system are integrated, the number of assembly components between them can be reduced, thereby decreasing the number of assembly parts, simplifying the structure of the drive unit, and lowering costs. Simultaneously, the rotation of the motor output shaft is transmitted to the planetary gear system via the sequential meshing of the motor gears with the reduction gear unit. The compact structure of each gear makes full use of the internal space of the non-metallic housing. The clamping device converts the rotation of the planetary gear system into linear motion, which acts on the caliper assembly to achieve automotive braking.

[0021] In addition, the reduction gear system and the circuit board are located on opposite sides of the metal support plate. The circuit board and the reduction gear system are isolated by the metal support plate, which can prevent the grease generated during the movement of the reduction gear system from coming into contact with the circuit board, thereby preventing the circuit board from malfunctioning. At the same time, the metal support plate can also play a role in cooling and heat dissipation.

[0022] According to another specific embodiment of the present invention, an electromechanical brake is disclosed, wherein the metal support plate is provided with a conductive through hole, and the top end of the metal pin is attached to the wall of the conductive through hole.

[0023] According to another specific embodiment of the present invention, an electromechanical brake is disclosed, wherein the first metal conductive sheet is provided with a protruding first conductive contact section, and the bottom end of the metal pin passes through the non-metallic shell and abuts against the upper end surface of the first conductive contact section.

[0024] Using the above technical solution, the top end of the metal pin is installed at the position of the conductive through hole, and the bottom end of the metal pin passes through the non-metallic shell and presses against the first metal conductive sheet. The setting of the metal pin realizes the electrical connection between the metal support plate and the motor. In addition, the metal pin is limited by the metal support plate and the non-metallic shell.

[0025] According to another specific embodiment of the present invention, the embodiment of the present invention discloses an electromechanical brake, wherein the motor further includes a motor bolt, and the motor bolt is connected to the metal motor housing;

[0026] The metal caliper housing is equipped with caliper bolts;

[0027] The second metal conductive sheet has a first patch through hole and a second patch through hole;

[0028] The second metal conductive sheet is sleeved on the motor bolt through the first patch through hole, and the second metal conductive sheet is sleeved on the caliper bolt through the second patch through hole.

[0029] Using the above technical solution, the second metal conductive sheet has a first patch through hole and a second patch through hole. The first patch through hole and the second patch through hole are respectively located on the motor bolt and the caliper bolt, so that the metal motor housing and the metal caliper housing are electrically connected through the second metal conductive sheet.

[0030] According to another specific embodiment of the present invention, an electromechanical brake is disclosed, wherein the reduction gear is sleeved on the outer periphery of the metal pin.

[0031] Using the above technical solution, the metal pin not only serves as a conductive component between the metal support plate and the motor, but also supports the reduction gear system, so that the reduction gear system sleeved on the outer periphery of the metal pin is limited by the metal support plate and the non-metallic housing.

[0032] According to another specific embodiment of the present invention, an electromechanical brake is disclosed, wherein a wiring harness interface is provided inside the non-metallic housing, and the motor further includes a motor power interface, both of which are connected to the circuit board.

[0033] By adopting the above technical solution, the wire harness interface is integrated into a non-metallic housing. The wire harness interface is electrically connected to the circuit board to realize signal transmission to the circuit board. Since the circuit board and the wire harness interface are integrated together, the structure of the electromechanical actuator can be simplified and the cost can be reduced.

[0034] According to another specific embodiment of the present invention, an electromechanical brake is disclosed, wherein both the non-metallic housing and the cover are made of plastic.

[0035] By adopting the above technical solution, the non-metallic shell and cover are made of plastic, which can reduce the weight of the electromechanical brake, achieve lightweight design, and save costs. Meanwhile, the metal support plate, metal motor housing, and metal pin in this embodiment are all made of metal, allowing the metal support plate, metal pin, and metal motor housing to be electrically connected sequentially.

[0036] The present invention also discloses a vehicle, which includes the electromechanical brake described in any of the above embodiments. Attached Figure Description

[0037] Figure 1 An explosive disassembly of the electromechanical brake provided in an embodiment of this application is shown. Figure 1 ;

[0038] Figure 2 This paper shows a perspective view of the assembled non-metallic shell and cover provided in the embodiment of this application;

[0039] Figure 3 An explosive disassembly of the electromechanical brake provided in an embodiment of this application is shown. Figure 2 ;

[0040] Figure 4 A schematic diagram of the mounting cavity inside the electromechanical brake provided in an embodiment of this application is shown;

[0041] Figure 5 A bottom view of the cover provided in an embodiment of this application is shown;

[0042] Figure 6 A connection diagram of the metal support plate and circuit board provided in an embodiment of this application is shown;

[0043] Figure 7 A perspective view of the motor provided in an embodiment of this application is shown;

[0044] Figure 8 A bottom view of the metal support plate provided in an embodiment of this application is shown;

[0045] Figure 9 This paper shows a schematic diagram of the connection of the metal pin provided in an embodiment of this application;

[0046] Figure 10 A schematic diagram of the second metal conductive sheet provided in an embodiment of this application is shown;

[0047] Figure 11 A connection diagram of the second metal conductive sheet provided in an embodiment of this application is shown;

[0048] Figure 12 A schematic diagram of the caliper assembly provided in an embodiment of this application is shown;

[0049] Figure 13 A top view of the non-metallic casing provided in an embodiment of this application is shown;

[0050] Figure 14 This illustration shows a schematic diagram of a non-metallic housing equipped with a metal support plate, provided in an embodiment of this application.

[0051] Figure 15 This illustration shows a three-dimensional schematic diagram of a non-metallic housing equipped with a circuit board, provided in an embodiment of this application.

[0052] Figure 16 A schematic diagram of a copper busbar provided in an embodiment of this application is shown;

[0053] Figure 17 This illustration shows a schematic diagram of a non-metallic housing equipped with a reduction gear system, provided in an embodiment of this application.

[0054] Figure 18 A schematic diagram of a two-stage transmission reduction gear system provided in an embodiment of this application is shown;

[0055] Figure 19 A schematic diagram of a three-stage transmission reduction gear system provided in an embodiment of this application is shown;

[0056] Figure 20 This shows a bottom-view perspective view of the assembled electromechanical brake provided in the embodiment of this application;

[0057] Figure 21 A schematic diagram of the reduction gear system and caliper assembly provided in the embodiments of this application is shown. Detailed Implementation

[0058] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0059] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0060] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, 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 the utility model.

[0061] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0062] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0063] An electromechanical brake is a device used to perform braking actions in automobiles. An electromechanical brake consists of a controller box and a motor, both of which require grounding. In some applications, to meet requirements for lightweight design, corrosion resistance, or specific structural design, the electromechanical brake housing may be made of plastic. In this case, since plastic itself is not conductive, it cannot directly achieve grounding. Existing technologies generally design a separate conductive grounding structure on the plastic housing, which increases the complexity of the housing structure and raises the manufacturing difficulty and cost.

[0064] To address the aforementioned issues and optimize the structure of the electromechanical brake, the electromechanical brake of this application embodiment uses metal materials to conduct electricity for the original components within the electromechanical brake, eliminating the need for additional grounding wires. This results in a simple grounding structure and lower cost.

[0065] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0066] refer to Figures 1 to 3 This application provides an electromechanical brake, including a non-metallic housing 10, a reduction gear system 20, a metal pin 23, a motor 30, a metal support plate 40, a circuit board 50, a cover 60, and a caliper assembly 80.

[0067] The cover 60 along the vertical direction (e.g.) Figure 1The cover 60 (as shown in the Z-direction) is welded to the upper surface of the non-metallic housing 10. Welding methods include full welding, spot welding, and segment welding, but are not limited to these. Both the non-metallic housing 10 and the cover 60 are made of plastic. The plastic cover 60 and the non-metallic housing 10 constitute the outer shell structure of the electromechanical brake. This application embodiment does not limit the materials used for the non-metallic housing 10 and the cover 60; these materials can be specifically set according to actual conditions. (Reference) Figure 4 A mounting cavity 70 is formed between the cover 60 and the non-metallic housing 10. A metal support plate 40 is disposed within the mounting cavity 70. The metal support plate 40 is made of aluminum alloy, but is not limited to this; any conductive metal material can be used. The metal support plate 40 is connected to the non-metallic housing 10 by screws. The metal support plate 40 divides the mounting cavity 70 into an upper cavity 71 and a lower cavity 72. The metal support plate 40 and the cover 60 define the upper cavity 71, while the metal support plate 40 and the non-metallic housing 10 define the lower cavity 72. A circuit board 50 is disposed within the upper cavity 71. (Refer to...) Figure 5 The circuit board 50 is encapsulated by the cover 60 to protect the circuit board 50. The lower cavity 72 is equipped with a reduction gear system 20 and a metal pin 23.

[0068] It should be noted that the reduction gear system 20, the metal support plate 40, and the circuit board 50 are arranged sequentially from bottom to top. The circuit board 50 and the reduction gear system 20 are isolated by the metal support plate 40, which can prevent the grease generated during the operation of the reduction gear system 20 from coming into contact with the circuit board 50, thereby preventing the circuit board 50 from malfunctioning. At the same time, the metal support plate 40, located between the reduction gear system 20 and the circuit board 50, also serves to cool and dissipate heat.

[0069] By adopting the above technical solution, the reduction gear system 20 and the circuit board 50 are integrated in the mounting cavity 70 between the cover 60 and the non-metallic housing 10. Both the cover 60 and the non-metallic housing 10 are made of plastic material. The cover 60 and the non-metallic housing 10 are fused together by welding. The rubber sealing rings at various positions of the outer shell structure are eliminated, the number of assembly parts is reduced, the structure is simplified, and the cost is reduced.

[0070] For example, refer to Figure 6 The circuit board 50 is provided with a grounding component 53. The lower surface of the circuit board 50 is attached to the upper surface of the metal support plate 40. The circuit board 50 and the metal support plate 40 are electrically connected through the grounding component 53. The grounding component 53 can be made of copper or gold, but is not limited to this, as long as it can conduct electricity between the circuit board 50 and the metal support plate 40.

[0071] For example, refer to Figure 7The motor 30 includes a metal motor housing 36, an output shaft, a motor gear 31 mounted on the output shaft, a magnet 32, a motor power interface 33, a first metal conductive plate 34, a second metal conductive plate 35, and motor bolts 37. The metal motor housing 36 is bolted to the outside of the non-metallic housing 10. The motor gear 31 is located in the lower cavity 72 and is connected to the reduction gear system 20. The magnet 32 ​​is mounted on the motor 30 and is used to detect the position of the motor 30. The motor power interface 33 is electrically connected to the circuit board 50. (Reference) Figures 8 to 9 The first metal conductive sheet 34 is fixedly connected to the surface of the metal motor housing 36. The first metal conductive sheet 34 has a protruding first conductive contact section 341. The metal support plate 40 has a conductive through hole 41. The top end of the metal pin 23 is attached to the wall of the conductive through hole 41, and the bottom end of the metal pin 23 passes through the non-metallic housing 10 and abuts against the upper end surface of the first conductive contact section 341. (Reference) Figures 10 to 11 The motor 30 and the caliper assembly 80 are respectively provided with a motor bolt 37 and a caliper bolt 87. The second metal conductive plate 35 is provided with a first patch through hole 351 and a second patch through hole 352. The second metal conductive plate 35 is sleeved on the motor bolt 37 through the first patch through hole 351 and on the caliper bolt 87 through the second patch through hole 352. In addition, the embodiments of this application do not specifically limit the material of the metal motor housing 36 and the metal pin 23, as long as it is a conductive metal material.

[0072] It should be noted that motor 30 is a brushless motor, but it is not limited to this and other motors can also be used.

[0073] For example, refer to Figure 12 The caliper assembly 80 includes a metal caliper housing 82, a metal guide pin screw 84, and a metal caliper bracket 83. The metal caliper housing 82 and the metal caliper bracket 83 are electrically connected through the metal caliper housing 82. The metal caliper housing 82 is provided with a caliper bolt hole 86, and a caliper bolt 87 is assembled into the caliper bolt hole 86 to realize the electrical connection between the second patch through hole 352 and the metal caliper housing 82. The metal caliper bracket 83 is provided with a vehicle body electrical connector 85, which is used for electrical connection with the vehicle body.

[0074] Using the above technical solution, the circuit board 50, the metal support plate 40, and the metal pin 23 are disposed inside the non-metallic housing 10, and the motor 30 is connected to the outside of the non-metallic housing 10. A first metal conductive plate 34 and a second metal conductive plate 35 are disposed on the metal motor housing 36. First, the circuit board 50 and the metal support plate 40 are connected by the grounding component 53. Then, the first metal conductive plate 34 on the metal support plate 40 and the metal motor housing 36 is connected by the metal pin 23. The first metal conductive plate 34 is connected to the second metal conductive plate 35 through the metal motor housing 36. The second metal conductive plate 35 is electrically connected to the metal caliper housing 82. The metal caliper housing 82 and the metal caliper bracket 83 are electrically connected. The metal caliper bracket 83 can be electrically connected to the vehicle body. This configuration allows the circuit board 50, metal support plate 40, metal pin 23, first metal conductive sheet 34, metal motor housing 36, second metal conductive sheet 35, metal caliper housing 82, metal caliper bracket 83, and vehicle body to be electrically connected sequentially. This achieves electrical connection between the circuit board 50 and the metal motor housing 36 and the vehicle body, thereby enabling the grounding design of the circuit board 50 and motor 30. Without altering the electromechanical brake's layout, there is no need to add an additional conductive grounding structure to the non-metallic housing 10, resulting in a simple structure and low cost.

[0075] refer to Figures 13 to 14 The non-metallic housing 10 has a wire harness interface 11, a first copper busbar 12, and a second copper busbar 13 on its side wall. Both the first copper busbar 12 and the second copper busbar 13 are located within the lower cavity 72. The wire harness interface 11 is positioned horizontally (e.g., ...). Figure 1 As shown in the X direction, the first copper busbar 12 and the second copper busbar 13 are both positioned along the vertical direction (as shown in the X direction). Figure 1 As shown in the Z direction, the circuit board 50 is provided with a first copper busbar connector 51 and a second copper busbar connector 52. One end of the first copper busbar 12 is connected to the pin in the motor power interface 33, and the other end passes through the metal support plate 40 and is connected to the first copper busbar connector 51. One end of the second copper busbar 13 is connected to the pin in the wire harness interface 11, and the other end passes through the metal support plate 40 and is connected to the second copper busbar connector 52.

[0076] The motor power interface 33 is connected to the circuit board 50 via the first copper busbar 12 to enable the circuit board 50 to control the motor 30. The wiring harness interface 11 contains a PCBA input power line and a signal line. The PCBA input power line is connected to the circuit board 50 to supply power, and the signal line is connected to the circuit board 50 to transmit signals. The first copper busbar 12 is used to transfer the power supply of the motor 30 to a suitable position before connecting it to the circuit board 50, and the second copper busbar 13 is used to transfer the wiring harness interface 11 to a suitable position before connecting it to the circuit board 50, so that the positions of the motor power interface 33 and the wiring harness interface 11 can be flexibly adjusted according to actual needs.

[0077] refer to Figure 15 In this embodiment, the outer periphery of the metal support plate 40 has a clearance area, through which the first copper busbar 12 and the second copper busbar 13 pass and connect to the circuit board 50. In other embodiments, through holes are provided on the metal support plate 40 for the first copper busbar 12 and the second copper busbar 13 to pass through, i.e., the first copper busbar 12 and the second copper busbar 13 pass through the through holes on the metal support plate 40 and connect to the circuit board 50. (See reference...) Figure 16 The number of the first copper busbar 12 and the second copper busbar 13 is not limited and can be adjusted according to actual needs.

[0078] In this embodiment, the non-metallic housing 10 is the main housing. The non-metallic housing 10 integrates a first copper busbar 12 and a second copper busbar 13. The first copper busbar 12 and the second copper busbar 13 respectively connect the motor power interface 33 and the wiring harness interface 11 to suitable positions and directly connect to the circuit board 50. The wiring harness interface 11 is directly injection molded onto the non-metallic housing 10, and its position is not limited to... Figure 1 The specific location shown can be adjusted according to customer needs.

[0079] refer to Figure 17 The reduction gear system 20 includes a planetary gear system 22 and a reduction gear unit 21. The motor gear 31, the reduction gear unit 21 and the planetary gear system 22 on the output shaft of the motor 30 mesh in sequence, thereby transmitting the rotation of the output shaft of the motor 30 to the planetary gear system 22.

[0080] Specifically, the reduction gear unit 21 includes two transmission modes: a two-stage transmission mode and a three-stage transmission mode.

[0081] refer to Figure 18 When the reduction gear unit 21 adopts a two-stage transmission mode, the reduction gear unit 21 includes a first bearing 212 and a first central gear 215. A metal pin 23 is located between the metal support plate 40 and the non-metallic housing 10. The first bearing 212 is sleeved on the outer periphery of the metal pin 23. The first central gear 215 is arranged on the outer periphery of the first bearing 212, so that the first central gear 215 can rotate relative to the metal pin 23. The first central gear 215 meshes between the motor gear 31 and the sun gear unit 221. The rotation of the motor gear 31 is transmitted to the first central gear 215, the sun gear unit 221 and the planetary gear 222 in sequence, thereby realizing the two-stage transmission.

[0082] refer to Figure 19When the reduction gear unit 21 adopts a three-stage transmission mode, the reduction gear unit 21 includes a first bearing 212, a second central gear 213, and a third central gear 214. A metal pin 23 is located between the metal support plate 40 and the non-metallic housing 10. The first bearing 212 is sleeved on the outer periphery of the metal pin 23. The second central gear 213 and the third central gear 214 are arranged on the outer periphery of the first bearing 212, so that the second central gear 213 and the third central gear 214 can rotate relative to the metal pin 23. The second central gear 213 and the third central gear 214 are coaxially connected. The third central gear 214 is set on the second central gear 213, and the size of the third central gear 214 is smaller than that of the second central gear 213. The second central gear 213 meshes with the motor gear 31, and the third central gear 214 meshes with the sun gear unit 221. The rotation of the motor gear 31 is transmitted sequentially to the second central gear 213, the third central gear 214, the sun gear unit 221, and the planetary gears 222, thereby realizing three-stage transmission.

[0083] It should be noted that the reduction gear unit 21 adopts a fixed shaft structure. The top end of the metal pin 23 is located at the position of the conductive through hole 41, and the bottom end of the metal pin 23 passes through the non-metallic housing 10 and contacts the first metal conductive sheet 34. The metal pin 23 is limited by the metal support plate 40 and the non-metallic housing 10.

[0084] refer to Figures 20 to 21 The planetary gear train 22 includes a sun gear unit 221, planet gears 222, a planet carrier 223, and an external gear ring 224. The sun gear unit 221 consists of a sun gear 2211 and a drive gear 2212, which are coaxially connected. The external gear ring 224 is injection molded within a non-metallic housing 10. Multiple planet gears 222 are disposed on the upper surface of the planet carrier 223. The number of planet gears 222 can be three, four, or five, but is not limited to these. The planet gears 222 are located within the external gear ring 224, and are meshed between the sun gear 2211 and the external gear ring 224. The motor gear 31, the reduction gear unit 21, and the drive gear 2212 are arranged sequentially. The meshing transmission drives the drive wheel 2212 to rotate the sun gear 2211. Since the external gear ring 224 is fixed, the planet gear 222 rotates on its own axis and revolves around the sun gear 2211 within the external gear ring 224 under the drive of the sun gear 2211. The revolution of the planet gear 222 drives the planet carrier 223 to rotate. The lower surface of the planet carrier 223 is provided with a spline 227. A clamping device is provided inside the metal caliper housing 82. The clamping device is provided with a spline interface 81 that matches the spline 227, so that the spline 227 can extend out of the non-metallic housing 10 and connect with the clamping device. The clamping device can convert the rotation output by the planet carrier 223 into a linear pushing force acting on the car caliper to achieve the braking of the car caliper.

[0085] In some embodiments, a pressure plate 225 is connected inside the non-metallic housing 10, and a second bearing 226 is connected between the pressure plate 225 and the drive wheel 2212, so that the drive wheel 2212 can rotate relative to the pressure plate 225 and the non-metallic housing 10.

[0086] The principle by which this application achieves braking of automotive caliper brakes is as follows:

[0087] Circuit board 50 controls the output shaft of motor 30 to rotate. The output shaft of motor 30 drives the motor gear 31 mounted on it to move. The motor gear 31 meshes with the drive wheel 2212 through the reduction gear unit 21, which in turn drives the sun gear 2211, which is coaxial with the drive wheel 2212, to rotate. Since the outer gear ring 224 is fixed in the non-metallic housing 10, the planet gear 222 rotates on its own axis and revolves around the sun gear 2211 under the drive of the sun gear 2211. The revolution of the planet gear 222 drives the planet carrier 223 to rotate. The clamping device converts the rotation of the planet gear 222 into linear thrust, which acts on the car caliper to finally achieve braking.

[0088] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. An electromechanical brake, characterized in that, include: Non-metallic casing; A cover is provided on the non-metallic shell to form an installation cavity; A circuit board is disposed within the mounting cavity, and the circuit board is provided with a grounding component; A metal support plate is disposed in the mounting cavity, located below the circuit board, and electrically connected to the grounding component; An electric motor is disposed outside the non-metallic housing. The electric motor includes a metal motor housing, and the outer surface of the metal motor housing is provided with a first metal conductive sheet and a second metal conductive sheet. A metal pin is disposed in the mounting cavity. The top end of the metal pin is electrically connected to the metal support plate, and the bottom end passes through the non-metallic shell and is electrically connected to the first metal conductive sheet. A caliper assembly for electrical connection to a vehicle body, the caliper assembly being electrically connected to the second metal conductive plate.

2. The electromechanical brake as described in claim 1, characterized in that: The caliper assembly includes a metal caliper housing, a metal guide pin screw, and a metal caliper bracket. The metal caliper housing and the metal caliper bracket are connected by the metal guide pin screw. The metal caliper housing is electrically connected to the second metal conductive plate. The metal caliper bracket is provided with a vehicle body electrical connector for electrical connection to the vehicle body.

3. An electromechanical brake as described in claim 2, characterized in that, Also includes: A reduction gear system is provided in the mounting cavity, and the reduction gear system and the circuit board are located on opposite sides of the metal support plate. The reduction gear system includes a planetary gear system and a reduction gear unit. A clamping device is disposed within the metal caliper housing; The motor includes an output shaft and a motor gear disposed on the output shaft. The motor gear is disposed in the mounting cavity and meshes with a reduction gear unit and a planetary gear train in sequence. The planetary gear train is connected to the clamping device for transmission.

4. An electromechanical brake as described in claim 1, characterized in that: The metal support plate is provided with conductive through holes, and the top end of the metal pin is attached to the wall of the conductive through holes.

5. An electromechanical brake as described in claim 1, characterized in that: The first metal conductive sheet has a raised first conductive contact section, and the bottom end of the metal pin passes through the non-metallic shell and abuts against the upper end surface of the first conductive contact section.

6. An electromechanical brake as described in claim 2, characterized in that: The motor also includes motor bolts, which are connected to the metal motor housing; The metal caliper housing is equipped with caliper bolts; The second metal conductive sheet is provided with a first patch through hole and a second patch through hole; The second metal conductive sheet is sleeved on the motor bolt through the first patch through hole, and the second metal conductive sheet is sleeved on the caliper bolt through the second patch through hole.

7. An electromechanical brake as described in claim 3, characterized in that: The reduction gear is sleeved on the outer periphery of the metal pin.

8. An electromechanical brake as described in claim 1, characterized in that: The non-metallic housing is provided with a wiring harness interface, and the motor also includes a motor power interface. Both the wiring harness interface and the motor power interface are connected to the circuit board.

9. An electromechanical brake as described in claim 1, characterized in that: Both the non-metallic shell and the cover are made of plastic.

10. A vehicle, characterized in that, Including the electromechanical brake as described in any one of claims 1-9.

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