Embodied electric power steering system

Abstract

The application relates to the technical field of EMB service braking, and discloses an EMB service braking transmission system and a vehicle. The EMB service braking transmission system comprises a mounting bracket, a driving assembly, a transmission assembly and an executing assembly. The driving assembly comprises a driving motor and a first bevel gear. The driving motor is fixedly arranged on the mounting bracket. The first bevel gear is fixedly connected with an output shaft of the driving motor. The transmission assembly comprises a first rotating shaft, a second rotating shaft, a second bevel gear and a third bevel gear. The second bevel gear is rotatably arranged on the mounting bracket through the first rotating shaft. The third bevel gear is rotatably arranged on the mounting bracket through the second rotating shaft. The second bevel gear is in meshing transmission connection between the first bevel gear and the third bevel gear. The executing assembly comprises a screw rod and a screw nut. The second rotating shaft is connected with the screw rod. The screw nut is threadedly sleeved on the screw rod. The screw nut is connected with a service braking device. Therefore, the multistage compact design of the transmission system is realized, and the overall space occupation of the EMB service braking transmission system is reduced.

Description

Technical Field

[0001] This application relates to the field of EMB service braking technology, and in particular to an EMB service braking transmission system and vehicle. Background Technology

[0002] With the rapid development of automotive braking systems, EMB (Electro Mechanical Brake) braking technology has been widely used.

[0003] The braking torque of EMB is generated entirely by an electric motor-driven actuator, eliminating the need for brake fluid and hydraulic components. This simplifies the structure of the braking system. EMB also provides a faster response time, which helps reduce braking distance and improve driving safety. In addition, EMB can precisely adjust the braking force of each wheel, which helps improve vehicle stability and handling.

[0004] However, due to the limited space around the wheel, the size of the electromechanical braking device needs to be reduced to avoid interference between the electromechanical braking device and the vehicle's steering or suspension system. Therefore, higher requirements are placed on the size of the EMB service brake transmission system. Utility Model Content

[0005] This application provides an EMB service brake transmission system and vehicle, which realizes a multi-stage compact design of the transmission system, reduces the overall space occupied by the EMB service brake transmission system, thereby helping to reduce the risk of interference with the vehicle steering system or suspension system.

[0006] To achieve the above objectives, the main technical solutions adopted in this application include:

[0007] In a first aspect, embodiments of this application provide an EMB service brake transmission system, including a mounting bracket;

[0008] The drive assembly includes a drive motor and a first bevel gear. The drive motor is fixedly mounted on the mounting bracket, and the first bevel gear is fixedly connected to the output shaft of the drive motor.

[0009] The transmission assembly includes a first rotating shaft, a second rotating shaft, a second bevel gear, and a third bevel gear. The second bevel gear is rotatably mounted on a mounting bracket via the first rotating shaft, and the third bevel gear is rotatably mounted on a mounting bracket via the second rotating shaft. Along the axial direction of the output shaft of the drive motor, the first bevel gear and the third bevel gear are arranged opposite to each other and spaced apart. The second bevel gear is meshed and connected between the first bevel gear and the third bevel gear.

[0010] The actuator includes a lead screw and a lead nut. A second rotating shaft is connected to the lead screw, and the lead nut is threaded onto the lead screw. The lead nut is connected to the vehicle braking device.

[0011] According to the embodiment of this application, the EMB service brake transmission system achieves 90° direction change transmission integration and multi-stage compact design by utilizing the meshing transmission between the first bevel gear, the second bevel gear and the third bevel gear. This reduces the overall space occupied by the EMB service brake transmission system, thereby helping to reduce the risk of interference with the vehicle steering system or suspension system. At the same time, the meshing transmission between the bevel gears helps to reduce the axial force of the offset shaft. Combined with local contact optimization, it can greatly reduce noise during the service braking process.

[0012] Optionally, the transmission assembly also includes a planetary gear system, which includes a sun gear, planet gears, a planet carrier, and an internal gear ring. The sun gear is fixedly connected to the second rotating shaft, the internal gear ring is fixedly mounted on the mounting bracket, and there are multiple planet gears. All multiple planet gears are meshed and connected between the sun gear and the internal gear ring, and all multiple planet gears are fixedly connected to the planet carrier. The planet carrier is connected to the lead screw.

[0013] Optionally, the transmission assembly also includes a splined shaft connected between the planetary carrier and the lead screw.

[0014] Optionally, the transmission assembly also includes a first support bearing, through which the first shaft is mounted on the mounting bracket.

[0015] Optionally, there are two first support bearings, which are symmetrically arranged on both sides of the second bevel gear along the axial direction of the first shaft.

[0016] Optionally, the transmission assembly also includes a second support bearing, through which the second shaft is mounted to the mounting bracket.

[0017] Optionally, the first rotating shaft includes a first segment and a second segment connected to each other, the diameter of the first segment being larger than the diameter of the second segment to form a first stepped surface, and the second bevel gear abutting against the first stepped surface.

[0018] Optionally, the second shaft includes a third segment and a fourth segment connected to each other, the diameter of the third segment being larger than the diameter of the fourth segment to form a second stepped surface, and the third bevel gear abutting against the second stepped surface.

[0019] Optionally, the actuating component also includes balls, the screw has a helical first raceway, the nut has a helical second raceway that matches the first raceway, and the balls fill the space between the first and second raceways.

[0020] Secondly, embodiments of this application provide a vehicle including the aforementioned EMB service brake transmission system.

[0021] According to the vehicle proposed in the embodiments of this application, by providing the above-mentioned EMB service brake transmission system, the 90° change of direction transmission integration and multi-stage compact design are achieved by utilizing the meshing transmission between the first bevel gear, the second bevel gear and the third bevel gear, which reduces the overall space occupation of the EMB service brake transmission system, thereby helping to reduce the risk of interference with the vehicle steering system or suspension system. At the same time, the meshing transmission between the bevel gears helps to reduce the axial force of the offset shaft, and with the local contact optimization, the noise during the service braking process can be greatly reduced. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A perspective view of an EMB service brake transmission system provided in one embodiment of this application;

[0024] Figure 2 This is a cross-sectional view of an EMB service brake transmission system provided in one embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the assembly of a planetary gear train and a second rotating shaft according to an embodiment of this application.

[0026] Figure 4 This is a perspective view of a planetary gear train provided in one embodiment of this application.

[0027] [Explanation of Labels in the Attached Image]

[0028] EMB service brake transmission system 100;

[0029] Drive assembly 1; drive motor 11; first bevel gear 12;

[0030] Transmission assembly 2; First rotating shaft 21; Second rotating shaft 22; Second bevel gear 23; Third bevel gear 24; Planetary gear train 25; Sun gear 251; Planet gears 252; Planet carrier 253; Internal gear ring 254; Splined shaft 26; First support bearing 27; Second support bearing 28;

[0031] Actuating component 3; lead screw 31; lead screw nut 32; ball bearing 33. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0034] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0037] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0038] It should be noted that with the rapid development of automotive braking systems, EMB (Electro Mechanical Brake) braking technology has been widely used.

[0039] The braking torque of EMB is generated entirely by an electric motor-driven actuator, eliminating the need for brake fluid and hydraulic components. This simplifies the structure of the braking system. EMB also provides a faster response time, which helps reduce braking distance and improve driving safety. In addition, EMB can precisely adjust the braking force of each wheel, which helps improve vehicle stability and handling.

[0040] However, due to the limited space around the wheel, the size of the electromechanical braking device needs to be reduced to avoid interference between the electromechanical braking device and the vehicle's steering or suspension system. Therefore, higher requirements are placed on the size of the EMB service brake transmission system.

[0041] Based on this, this application proposes an EMB service brake transmission system 100, which utilizes the meshing transmission between the first bevel gear 12, the second bevel gear 23 and the third bevel gear 24 to achieve 90° change-of-direction transmission integration and multi-stage compact design, reducing the overall space occupied by the EMB service brake transmission system 100. This helps to reduce the risk of interference with the vehicle steering system or suspension system. At the same time, the meshing transmission between the bevel gears helps to reduce the axial force of the offset shaft. Combined with local contact optimization, it can greatly reduce noise during the service braking process.

[0042] The EMB service brake transmission system 100 proposed in this application is described below with reference to the accompanying drawings.

[0043] like Figures 1-4 As shown, the EMB service brake transmission system 100 according to the first aspect embodiment of this application includes: a mounting bracket, a drive assembly 1, a transmission assembly 2, and an execution assembly 3. The drive assembly 1 includes a drive motor and a first bevel gear 12. The drive motor is fixedly mounted on the mounting bracket, and the first bevel gear 12 is fixedly connected to the output shaft of the drive motor. The transmission assembly 2 includes a first rotating shaft 21, a second rotating shaft 22, a second bevel gear 23, and a third bevel gear 24. The second bevel gear 23 is rotatably mounted on the mounting bracket via the first rotating shaft 21, and the third bevel gear 24 is rotatably mounted on the mounting bracket via the second rotating shaft 22. Along the axial direction of the output shaft of the drive motor, the first bevel gear 12 and the third bevel gear 24 are arranged opposite to each other and spaced apart. The second bevel gear 23 is meshed and driven between the first bevel gear 12 and the third bevel gear 24. The execution assembly 3 includes a lead screw 31 and a lead nut 32. The second rotating shaft 22 is connected to the lead screw 31, and the lead nut 32 is threaded onto the lead screw 31 and connected to the service brake device.

[0044] Specifically, the drive motor can be fixedly mounted on the mounting bracket by bolts, and the first bevel gear 12 is fixedly sleeved on the output shaft of the drive motor by interference fit, and the output shaft has a shoulder, which forms an axial position for the first bevel gear 12.

[0045] Furthermore, the transmission assembly 2 includes a first rotating shaft 21, a second rotating shaft 22, a second bevel gear 23, and a third bevel gear 24. The first rotating shaft 21 is rotatably mounted on the mounting bracket, and the second bevel gear 23 is fixedly sleeved on the first rotating shaft 21 by an interference fit. Similarly, the second rotating shaft 22 is rotatably mounted on the mounting bracket, and the third bevel gear 24 is fixedly sleeved on the second rotating shaft 22 by an interference fit.

[0046] Continue to refer to Figure 2 As shown, along the axial direction of the output shaft of the drive motor, the first bevel gear 12 and the third bevel gear 24 are arranged opposite to each other and spaced apart. The second bevel gear 23 is meshed and connected between the first bevel gear 12 and the third bevel gear 24. With this arrangement, the meshing transmission between the first bevel gear 12, the second bevel gear 23 and the third bevel gear 24 realizes the 90° change of direction transmission integration and multi-stage compact design, making the EMB service brake transmission system 100 more compact and reducing the overall space occupied by the EMB service brake transmission system 100. This helps to reduce the risk of interference with the vehicle steering system or suspension system.

[0047] The actuator 3 includes a lead screw 31 and a lead screw 32. The second rotating shaft 22 is connected to the lead screw 31. The lead screw 32 is threaded onto the lead screw 31 and is used to connect to the brake pads of the vehicle braking device. When the drive motor drives the transmission assembly 2 to operate, the second rotating shaft 22 drives the lead screw 31 to rotate, thereby converting the rotational motion into the linear motion of the lead screw 32, realizing the clamping or releasing of the brake disc.

[0048] Furthermore, to enable those skilled in the art to better understand this solution, as a specific example, when the vehicle needs to brake, the drive motor starts and drives the first bevel gear 12 to rotate (e.g., clockwise). The first bevel gear 12 drives the second bevel gear 23, which meshes with it, to rotate around the axis of the first shaft 21 (clockwise). The second bevel gear 23 then drives the third bevel gear 24 to rotate around the axis of the second shaft 22 (counterclockwise). The second shaft 22 transmits power to the lead screw 31, driving the lead screw 31 to rotate. The rotational motion of the lead screw 31 is converted into linear motion through the lead screw nut 32, pushing the brake pads to move towards the brake disc and generating braking force. When the brake needs to be released, the drive motor reverses, the transmission chain moves in the opposite direction, the lead screw nut 32 retracts, and the brake pads are released.

[0049] In summary, the EMB service brake transmission system 100 proposed in this application realizes 90° direction change transmission integration and multi-stage compact design by utilizing the meshing transmission between the first bevel gear 12, the second bevel gear 23 and the third bevel gear 24. This reduces the overall space occupied by the EMB service brake transmission system 100, thereby helping to reduce the risk of interference with the vehicle steering system or suspension system. At the same time, the meshing transmission between the bevel gears helps to reduce the axial force of the offset shaft. Combined with local contact optimization, it can greatly reduce noise during the service braking process.

[0050] In some embodiments of this application, such as Figures 2-4 As shown, the transmission assembly 2 also includes a planetary gear system 252, which includes a sun gear 251, planetary gears 252, a planet carrier 253, and an internal gear ring 254. The sun gear 251 is fixedly connected to the second rotating shaft 22, and the internal gear ring 254 is fixedly mounted on the mounting bracket. There are multiple planetary gears 252, and all of the multiple planetary gears 252 are meshed and connected between the sun gear 251 and the internal gear ring 254. All of the multiple planetary gears 252 are fixedly connected to the planet carrier 253, and the planet carrier 253 is connected to the lead screw 31.

[0051] Specifically, to achieve a larger reduction ratio and torque output, the transmission assembly 2 may further include a planetary gear system 252. The planetary gear system 252 includes a sun gear 251, planetary gears 252, a planet carrier 253, and an internal gear ring 254. The sun gear 251 is fixedly connected to the second shaft 22, the internal gear ring 254 is fixed to a mounting bracket, multiple planetary gears 252 are evenly distributed and simultaneously mesh with the sun gear 251 and the internal gear ring 254, and each planetary gear 252 is mounted on the planet carrier 253 via planetary pins. The planet carrier 253 serves as the output end and is connected to the lead screw 31.

[0052] When the vehicle needs to brake, the drive motor starts and drives the first bevel gear 12 to rotate (e.g., clockwise). The first bevel gear 12 drives the second bevel gear 23, which meshes with it, to rotate around the axis of the first shaft 21 (clockwise). The second bevel gear 23 then drives the third bevel gear 24 to rotate around the axis of the second shaft 22 (counterclockwise). The third bevel gear 24 then drives the sun gear 251 to rotate counterclockwise synchronously through the second shaft 22. The sun gear 251 drives multiple planet gears 252 to revolve around a fixed internal gear ring 254, thereby driving the planet carrier 253 to rotate clockwise at a lower speed and higher torque. The planet carrier 253 transmits power to the lead screw 31 to drive the lead screw 31 to rotate. The rotational motion of the lead screw 31 is converted into linear motion through the nut 32, pushing the brake pads towards the brake disc to generate braking force. When the brakes need to be released, the drive motor reverses, the transmission chain moves in the opposite direction, the nut 32 retracts, and the brake pads are released.

[0053] This configuration, utilizing the reduction and torque-increasing effect of the planetary gear 252 series, helps to further improve the output torque of the EMB service brake transmission system 100.

[0054] In some embodiments of this application, such as Figure 2 As shown, the transmission assembly 2 also includes a splined shaft 26, which is connected between the planetary carrier 253 and the lead screw 31.

[0055] Specifically, in order to transmit the output torque of the planetary carrier 253 and allow for minor alignment errors, the transmission assembly 2 also includes a spline shaft 26. The upper end of the spline shaft 26 is interference-fitted with the inner spline of the planetary carrier 253 through an external spline, while the lower end of the spline shaft 26 is tightly connected to the inner square hole of the lead screw 31 through a square shaft, thereby achieving reliable power transmission.

[0056] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, the transmission assembly 2 also includes a first support bearing 27, and the first rotating shaft 21 is mounted on the mounting bracket via the first support bearing 27.

[0057] Specifically, the function of the first support bearing 27 is to support the first rotating shaft 21, ensuring its smooth and stable rotation relative to the mounting bracket, and reliably transmitting the radial and axial forces generated during the transmission process to the mounting bracket. This ensures the accuracy and smoothness of the meshing transmission between the second bevel gear 23 on the first rotating shaft 21 and the first bevel gear 12 and the third bevel gear 24, thereby effectively reducing transmission clearance, suppressing vibration and noise, and distributing the load, ultimately improving the accuracy, efficiency, reliability and service life of the entire transmission system.

[0058] In some embodiments of this application, such as Figure 2 As shown, there are two first support bearings 27, which are symmetrically arranged on both sides of the second bevel gear 23 along the axial direction of the first rotating shaft 21.

[0059] Specifically, by symmetrically arranging the two first support bearings 27 on both sides of the second bevel gear 23 along the axial direction of the first shaft 21, the first shaft 21 can be provided with a larger span of stable support, which significantly improves the rigidity and bending resistance of the first shaft 21. This ensures that the second bevel gear 23 has a precise meshing position and balanced force when transmitting torque, effectively suppresses axial movement during transmission, and ultimately ensures that the entire transmission system operates smoothly and reliably, and helps to extend its service life.

[0060] In some embodiments of this application, such as Figure 1 and Figure 2As shown, the transmission assembly 2 also includes a second support bearing 28, and the second rotating shaft 22 is mounted on the mounting bracket via the second support bearing 28.

[0061] Specifically, the function of the second support bearing 28 is to provide a stable and reliable rotational support for the second shaft 22. The second support bearing 28 can effectively withstand the radial and axial loads transmitted by the third bevel gear 24, ensuring that the second shaft 22 and the planetary gear 252 system 25 on it can maintain precise positioning and a stable axis of rotation. This ensures the smoothness and accuracy of the meshing transmission between the second bevel gear 23 and the third bevel gear 24, as well as the subsequent planetary gear 252 system 25, which helps to suppress the vibration and axial movement of the shaft system and lays a solid foundation for the system to achieve high-efficiency and low-noise power transmission.

[0062] In some embodiments of this application, the first rotating shaft 21 includes a first segment and a second segment connected to each other, the diameter of the first segment being larger than the diameter of the second segment to form a first stepped surface, and the second bevel gear 23 abutting against the first stepped surface.

[0063] Specifically, the first rotating shaft 21 includes a first section and a second section with different diameters. The connection between the first section and the second section forms a first stepped surface. The second bevel gear 23 is assembled with the first stepped surface. This configuration provides a precise and reliable axial positioning reference for the second bevel gear 23, eliminating the need for additional positioning parts (such as retaining rings or lock nuts). This not only simplifies the assembly process and improves assembly efficiency, but more importantly, the rigid shoulder support ensures that the second bevel gear 23 remains stable under axial force during transmission. This effectively avoids problems such as poor meshing, increased wear, or increased noise caused by axial movement of the second bevel gear 23, thus improving the accuracy and reliability of the transmission.

[0064] In some embodiments of this application, the second rotating shaft 22 includes a third segment and a fourth segment connected to each other, the diameter of the third segment being larger than the diameter of the fourth segment to form a second stepped surface, and the third bevel gear 24 abutting against the second stepped surface.

[0065] Specifically, the second shaft 22 includes a third section and a fourth section with different diameters. The connection between the third and fourth sections forms a second stepped surface. The third bevel gear 24 is assembled with the second stepped surface. This arrangement provides a stable axial positioning for the critical third bevel gear 24, which not only simplifies the assembly process and avoids the use of additional positioning parts, but more importantly, the rigid shoulder support ensures that the axial position of the third bevel gear 24 is absolutely fixed when transmitting large torques. This effectively prevents unstable transmission, decreased meshing accuracy, and abnormal wear of the third bevel gear 24 due to axial movement, and significantly improves the reliability of power transmission and system life.

[0066] In some embodiments of this application, such as Figure 2 As shown, the actuator 3 also includes balls 33, the lead screw 31 has a helical first raceway, the lead screw 32 has a helical second raceway that matches the first raceway, and the balls 33 fill the space between the first raceway and the second raceway.

[0067] Specifically, the actuator 3 is configured with balls 33, and the lead screw 31 and the lead nut 32 are respectively provided with matching helical first and second raceways, with the balls 33 filling the space between them. This configuration transforms the sliding friction between the lead screw 31 and the lead nut 32 into rolling friction, significantly reducing frictional resistance and energy loss during transmission. This results in higher transmission efficiency, more precise linear displacement control, and smoother motion response. At the same time, it effectively reduces wear on parts, extends the service life of the actuator 3, and helps to suppress thermal expansion caused by frictional heat, thereby improving the reliability and durability of the entire braking system.

[0068] Secondly, embodiments of this application provide a vehicle including the aforementioned EMB service brake transmission system.

[0069] According to the vehicle proposed in the embodiments of this application, by providing the above-mentioned EMB service brake transmission system 100, the 90° change of direction transmission integration and multi-stage compact design are achieved by utilizing the meshing transmission between the first bevel gear 12, the second bevel gear 23 and the third bevel gear 24, which reduces the overall space occupation of the EMB service brake transmission system 100, thereby helping to reduce the risk of interference with the vehicle steering system or suspension system. At the same time, the meshing transmission between the bevel gears helps to reduce the axial force of the offset shaft, and with the local contact optimization, the noise during the service braking process can be greatly reduced.

[0070] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0071] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0072] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0073] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An EMB service brake transmission system, characterized in that, include Mounting bracket; The drive assembly (1) includes a drive motor (11) and a first bevel gear (12). The drive motor (11) is fixedly mounted on the mounting bracket, and the first bevel gear (12) is fixedly connected to the output shaft of the drive motor (11). The transmission assembly (2) includes a first rotating shaft (21), a second rotating shaft (22), a second bevel gear (23), and a third bevel gear (24). The second bevel gear (23) is rotatably mounted on the mounting bracket via the first rotating shaft (21), and the third bevel gear (24) is rotatably mounted on the mounting bracket via the second rotating shaft (22). Along the axial direction of the output shaft of the drive motor (11), the first bevel gear (12) and the third bevel gear (24) are arranged opposite to each other and spaced apart. The second bevel gear (23) is meshed and connected between the first bevel gear (12) and the third bevel gear (24). The execution component (3) includes a lead screw (31) and a lead screw nut (32). The second rotating shaft (22) is connected to the lead screw (31). The lead screw nut (32) is threaded onto the lead screw (31). The lead screw nut (32) is connected to the vehicle braking device.

2. The EMB service brake transmission system according to claim 1, characterized in that, The transmission assembly (2) further includes a planetary gear (252) system (25), which includes a sun gear (251), planetary gears (252), a planet carrier (253), and an internal gear ring (254). The sun gear (251) is fixedly connected to the second rotating shaft (22), and the internal gear ring (254) is fixedly mounted on the mounting bracket. There are multiple planetary gears (252), and all of the multiple planetary gears (252) are meshed and connected between the sun gear (251) and the internal gear ring (254). All of the multiple planetary gears (252) are fixedly connected to the planet carrier (253), and the planet carrier (253) is connected to the lead screw (31).

3. The EMB service brake transmission system according to claim 2, characterized in that, The transmission assembly (2) also includes a spline shaft (26) connected between the planetary carrier (253) and the lead screw (31).

4. The EMB service brake transmission system according to claim 1, characterized in that, The transmission assembly (2) further includes a first support bearing (27), and the first rotating shaft (21) is mounted on the mounting bracket via the first support bearing (27).

5. The EMB service brake transmission system according to claim 4, characterized in that, There are two first support bearings (27), which are symmetrically arranged on both sides of the second bevel gear (23) along the axial direction of the first shaft (21).

6. The EMB service brake transmission system according to claim 1, characterized in that, The transmission assembly (2) further includes a second support bearing (28), and the second rotating shaft (22) is mounted on the mounting bracket via the second support bearing (28).

7. The EMB service brake transmission system according to claim 1, characterized in that, The first rotating shaft (21) includes a first segment and a second segment connected to each other. The diameter of the first segment is larger than the diameter of the second segment to form a first stepped surface. The second bevel gear (23) is assembled to abut against the first stepped surface.

8. The EMB service brake transmission system according to claim 1, characterized in that, The second rotating shaft (22) includes a third segment and a fourth segment connected to each other. The diameter of the third segment is larger than the diameter of the fourth segment to form a second stepped surface. The third bevel gear (24) is assembled to abut against the second stepped surface.

9. The EMB service brake transmission system according to claim 1, characterized in that, The actuating component (3) further includes balls (33), the lead screw (31) has a helical first raceway, the lead screw nut (32) has a helical second raceway that matches the first raceway, and the balls (33) fill the space between the first raceway and the second raceway.

10. A vehicle, characterized in that, Includes the EMB service brake transmission system (100) according to any one of claims 1-9.

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