Electronic mechanical brake execution device

Abstract

The utility model discloses an electronic mechanical brake executing device which comprises a gear box, a motor and a gear transmission mechanism. The gear transmission mechanism comprises a primary transmission gear assembly which is in transmission connection with a motor; the second-stage transmission gear assembly is in transmission connection with the first-stage transmission gear assembly and comprises a fourth gear and a sun gear which are coaxially arranged, and the fourth gear can drive the sun gear to rotate; a planetary gear transmission assembly; the supporting plate is located between the fourth gear and the sun gear in the axial direction of the gear transmission mechanism, fixedly connected with the gear box and used for supporting the fourth gear. By adopting the technical scheme, the motor and the gear transmission mechanism are integrated in the gear box, so that the mounting precision and stability of the secondary transmission gear assembly can be improved, excessive vibration and noise generated during high-speed operation of the gear are avoided, the service life of the gear transmission mechanism is prolonged, and the transmission efficiency of the gear transmission mechanism is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of vehicle braking, and particularly relates to an electronic mechanical braking execution device. BACKGROUND

[0002] The electro mechanical brake system, namely an electronic mechanical brake system (EMB), comprises an electronic mechanical brake execution device and a mechanical caliper mechanism. The electronic mechanical brake execution device comprises a motor and a gear transmission mechanism. The gear transmission mechanism reduces the output rotating speed of the motor, increases the output torque and transmits the output torque to the mechanical caliper mechanism, so that the brake function is realized.

[0003] The electro mechanical brake system removes the hydraulic components on the basis of the traditional hydraulic brake system, increases the gear box for speed reduction and torque increase and the control (powerpack) assembly. In the electro mechanical brake system, the gear box functions to reduce the high rotating speed of the motor and increase the torque, so as to generate sufficient brake force. In order to ensure the stability of the gear transmission mechanism and reduce the noise, the gear transmission mechanism needs to be effectively fixed.

[0004] In the prior art, the fixing mode of the gear transmission mechanism can be different due to the design. Generally, the sun gear and the gear coaxially arranged with the sun gear (the secondary transmission gear assembly) are often fixed on the upper cover (i.e. the top cover plate of the gear box). For example, the sun gear and the gear coaxially arranged with the sun gear are fixed on the same pin shaft, the pin shaft extends out of the gear to be matched with the shaft hole arranged on the gear box cover, so that the secondary transmission assembly is fixed on the upper cover. Then, the secondary transmission assembly is assembled into the gear box shell.

[0005] However, due to the manufacturing tolerance and the installation tolerance, the above fixing mode can cause the installation precision of the secondary transmission gear assembly to be not high, so that the gear generates too much vibration and noise when the gear rotates at high speed, thereby affecting the rotation stability of the gear, and further affecting the transmission efficiency and the brake effect. TECHNICAL CONTENT

[0006] The utility model provides the following technical scheme to solve the above technical problem.

[0007] The utility model provides an electronic mechanical brake execution device, which comprises:

[0008] A gear box;

[0009] A motor installed in the gear box;

[0010] A gear transmission mechanism installed in the gear box and in transmission connection with the motor, for outputting the driving force of the motor, comprising:

[0011] A primary transmission gear assembly in transmission connection with the motor;

[0012] The secondary transmission gear assembly is in driving connection with the primary transmission gear assembly, and comprises a fourth gear and a sun gear coaxially arranged, the fourth gear being capable of driving the sun gear to rotate;

[0013] The planetary gear transmission assembly comprises a plurality of planetary gears and an output spline, the sun gear being located at the center of the plurality of planetary gears and being in mesh with the plurality of planetary gears respectively, the output spline being used for outputting driving force, and the central axis of the secondary transmission gear assembly coincides with the central axis of the planetary gear transmission assembly;

[0014] The support plate is located between the fourth gear and the sun gear along the axial direction of the gear transmission mechanism, and is fixedly connected with the gear box, and is used for supporting the fourth gear.

[0015] By adopting the above technical scheme, the motor and the gear transmission mechanism are integrated in the gear box, so that the installation precision and stability of the secondary transmission gear assembly can be improved, excessive vibration and noise of the gear during high-speed rotation can be avoided, and the service life and transmission efficiency of the gear transmission mechanism can be improved.

[0016] Optionally, the outer edge of the support plate has a protruding portion, and the protruding portion is riveted with the gear box; or the support plate is welded with the gear box.

[0017] Optionally, one end of the motor is provided with an output shaft, the output shaft extends into the gear box, a first gear is fixed on the output shaft, the primary transmission gear assembly comprises a second gear and a third gear coaxially arranged, the first gear is in mesh with the third gear, the second gear is in mesh with the fourth gear, the third gear is arranged at the lower end surface of the second gear, and the support plate is arranged beside the third gear.

[0018] Optionally, the gear transmission mechanism further comprises a motor magnet, the motor magnet is in axial butt joint with the first gear and is located above the first gear.

[0019] Optionally, one end of the support plate close to the third gear is provided with a clearance gap, the clearance gap is used for giving way to the third gear, so that the third gear can rotate.

[0020] Optionally, the primary transmission gear assembly further comprises a first pin shaft penetrating the second gear and the third gear, and the gear box is provided with a positioning pin hole, the positioning pin hole is used for cooperating with the first pin shaft to press-fit the primary transmission gear assembly in the gear box.

[0021] Optionally, the second gear, the third gear and the first pin shaft are in sliding cooperation; or a first bearing is arranged between the second gear, the third gear and the first pin shaft.

[0022] Optionally, the planetary gear transmission assembly further comprises a planet carrier, the plurality of planet gears are assembled on a first end surface of the planet carrier, and the output spline is assembled on a second end surface of the planet carrier, the first end surface and the second end surface being opposite surfaces of the planet carrier.

[0023] A first positioning part matched with the fourth gear is arranged at a central position of an upper end surface of the sun gear, and a second positioning part matched with the planet carrier is arranged at a central position of a lower end surface of the sun gear, and the sun gear is positioned between the fourth gear and the planet carrier through the first positioning part and the second positioning part.

[0024] Optionally, the second positioning part is an annular column, and a positioning slot hole is correspondingly arranged on the planet carrier; or the second positioning part is the positioning slot hole, and an annular column is correspondingly arranged on the planet carrier; and the annular column is inserted into the positioning slot hole to position one end of the sun gear on the planet carrier.

[0025] Optionally, a second bearing or a bushing is arranged on an outer periphery of the planet carrier; or a second bearing is arranged on the outer periphery of the planet carrier, and a bushing is arranged on an outer periphery of the second bearing; and the planet carrier is positioned in the gear box through the second bearing or the bushing.

[0026] Optionally, a second bearing is arranged on an outer periphery of the planet carrier, a bushing is arranged on an outer periphery of the second bearing, a snap ring is arranged on an outer periphery of the bushing, a clamping groove is arranged on an inner wall of the gear box, and the snap ring is clamped in the clamping groove to fix the planet carrier in the gear box.

[0027] Optionally, the planet carrier is provided with an extension cavity at a bottom portion, the output spline comprises an engaging area and an extension area, the engaging area is embedded in the extension cavity, and the extension area extends out of the extension cavity and is matched with an inner spline hole at a tail end of the screw rod in the caliper assembly to output driving force to the screw rod.

[0028] Optionally, the output spline comprises an extension area, the extension area extends out of the bottom portion of the planet carrier and is matched with the inner spline hole at the tail end of the screw rod in the caliper assembly to output the driving force to the screw rod.

[0029] Optionally, a limiting hole is arranged at a central position of an upper end surface of the support plate, a third positioning part is arranged at a central position of a lower end surface of the fourth gear, a third bearing is arranged on an outer periphery of the third positioning part, and the third bearing is embedded in the limiting hole to fix the fourth gear on the support plate.

[0030] Optionally, the support plate is made of metal or powder metallurgy, and the gear box is made of metal or plastic. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 Fig. 1 shows a schematic diagram of the overall structure of a gear transmission mechanism in an embodiment of the present application;

[0032] Figure 2An explosion schematic view of the gear transmission mechanism in one embodiment of the utility model is shown;

[0033] Figure 3 An explosion schematic view of the electronic mechanical brake execution device in one embodiment of the utility model is shown;

[0034] Figure 4 An explosion schematic view of the electronic mechanical brake execution device in another embodiment of the utility model is shown;

[0035] Figure 5 A whole structure schematic view of the gear box in one embodiment of the utility model is shown;

[0036] Figure 6 A whole structure schematic view of the motor in one embodiment of the utility model is shown;

[0037] Figure 7 A schematic view of the second gear, the third gear and the first pin shaft sliding fit in one embodiment of the utility model is shown;

[0038] Figure 8 A schematic view of the second gear, the third gear and the first pin shaft being provided with the first bearing in another embodiment of the utility model is shown;

[0039] Figure 9 A whole structure schematic view of the planetary gear transmission assembly in one embodiment of the utility model is shown;

[0040] Figure 10 A whole structure schematic view of the planetary gear transmission assembly in another embodiment of the utility model is shown Figure 1 ;

[0041] Figure 11 A whole structure schematic view of the planetary gear transmission assembly in another embodiment of the utility model is shown Figure 2 .

[0042] (Symbol explanation)

[0043] 1-gearbox, 2-motor, 2.1-output shaft, 3-gear transmission mechanism, 4-primary transmission gear assembly, 5-secondary transmission gear assembly, 6-fourth gear, 7-sun gear, 7.1-upper end face, 7.2-lower end face, 8-planetary gear transmission assembly, 9-planet gear, 10-output spline, 10.2-protruding area, 11-support plate, 12-first gear, 13-second gear, 14-third gear, 15-clearance notch, 16-first pin shaft, 17-positioning pin hole, 18-first bearing, 19-planet carrier, 19.1-first end face, 19.2-second end face, 19.3-bottom, 20-first positioning portion, 21-force sensor connector, 22-second bearing, 23-limiting hole, 24-third positioning portion, 25-third bearing, 26-motor magnet, 27-outer ring gear, 28-anti-rotation boss, 29-clamping groove, 30-planet gear shaft, 31-sun gear positioning shaft, 32-bushing, 33-clamping ring, 34-positioning hole, 35-cover plate, 36-force sensor connector channel, 37-protruding cavity. DETAILED DESCRIPTION

[0044] The above description is only used to illustrate the specific embodiments of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. Although the description of the present application is combined with the preferred embodiments, it does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application with the embodiments is to cover other options or modifications that can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0045] The terms "first", "second", and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0046] In the description of the present embodiment, it should be noted that unless otherwise explicitly specified and limited, the terms "set", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.

[0047] 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.

[0048] 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.

[0049] like Figures 1-3 As shown, the electromechanical braking actuator provided by this utility model includes: a gearbox 1, a motor 2, and a gear transmission mechanism 3. Both the motor 2 and the gear transmission mechanism 3 are installed inside the gearbox 1. The gear transmission mechanism 3 is connected to the motor 2 for transmitting the driving force of the motor 2. The gear transmission mechanism 3 includes:

[0050] The primary transmission gear assembly 4 is connected to the motor 2 for transmission.

[0051] The secondary transmission gear assembly 5 is connected to the primary transmission gear assembly 4. It includes a fourth gear 6 and a sun gear 7 arranged coaxially, meaning that the fourth gear 6 and the sun gear 7 are coaxially arranged and distributed along the axial direction. This allows the fourth gear 6 to drive the sun gear 7 to rotate, while also ensuring the stability of the positioning between the fourth gear 6 and the sun gear 7.

[0052] The planetary gear transmission assembly 8 includes multiple planetary gears 9 and an output spline 10. The sun gear 7 is located at the center of the multiple planetary gears 9 and meshes with each of the multiple planetary gears 9. The output spline 10 is used to output driving force. The central axis of the secondary transmission gear assembly 5 coincides with the central axis of the planetary gear transmission assembly 8.

[0053] Support plate 11, along the axial direction of gear transmission mechanism 3 (e.g.) Figure 1 The Z-direction gear is located between the fourth gear 6 and the sun gear 7, and is fixedly connected to the gearbox 1 to support the fourth gear 6.

[0054] By adopting the above technical solution, the motor 2 and the gear transmission mechanism 3 are integrated into the gearbox 1, which can improve the installation accuracy and stability of the secondary transmission gear assembly 5, avoid excessive vibration and noise of the gears when running at high speed, and improve the service life and transmission efficiency of the gear transmission mechanism 3.

[0055] Specifically, the utility model discloses between the fourth gear 6 and sun gear 7 additionally add support plate 11, support plate 11 is fixed in gear box 1, after with this support plate 11 as the positioning base point, fourth gear 6 is fixed on support plate 11, because sun gear 7 is coaxial with fourth gear 6, the rotation of fourth gear 6 can drive sun gear 7 to rotate, therefore support plate 11 can not only play the support and fixed effect to fourth gear 6, also can play the accurate positioning effect to sun gear 7. After again the installation of perfect two -stage gear drive assembly 4 is gathered in gear box 1, thereby improved the installation accuracy, stability and consistency of gear drive mechanism 3, thereby avoid the excessive vibration and noise of gear when high -speed operation, improve the service life and transmission efficiency of gear drive mechanism 3.

[0056] Further, with reference to Figures 1-3 In the above embodiment, the outer edge of the support plate 11 is provided with an extension part 11.1, which is fixed to the gear box 1 by riveting. By riveting, the support plate 11 can be firmly fixed in the gear box 1, ensuring the stability of the connection between the two and preventing loosening, thereby ensuring the stability of the gear drive mechanism 3.

[0057] Further, with reference to Figure 4 In the above embodiment, the support plate 11 is welded to the gear box 1. The support plate 11 and the gear box 1 are designed as an integral structure (the support plate 11 becomes part of the gear box 1 housing), so that the support plate 11 can effectively share the force and torque inside the gear box 1, thereby enhancing the structural strength and rigidity of the entire gear box 1.

[0058] Further, with reference to Figure 1 and Figure 6 In the above embodiments, one end of the motor 2 is provided with an output shaft 2.1, which extends into the gear box 1, and a first gear 12 is fixed on the output shaft 2.1. The first gear 12 is engaged with the third gear 14, and the second gear 13 is engaged with the fourth gear 6. The third gear 14 is arranged on the lower end surface of the second gear 13, and the support plate 11 is arranged beside the third gear 14. It should be noted that a motor accommodating cavity can be specially arranged in the gear box 1 to assemble the motor 2, so that the motor 2 is integrated or assembled into the gear box 1. In addition, the motor accommodating cavity can also not be arranged, and only the output shaft 2.1 of the motor 2 can be extended into the gear box 1.

[0059] With reference to Figure 2The working principle of the electromechanical braking actuator provided by this utility model is as follows: the motor 1 drives the first gear 12 to rotate, the first gear 12 drives the third gear 14 to rotate through meshing, the third gear 14 drives the second gear 13 set on the same axis to rotate, the second gear 13 drives the fourth gear 6 to rotate through meshing, the fourth gear 6 drives the sun gear 7 to rotate, the sun gear 7 drives the planet gear 9 to rotate through meshing, the planet gear 9 revolves through meshing with the external gear ring 27, driving the planet gear carrier 19 to rotate, the planet gear carrier 19 drives the output spline 10 to rotate, and the output spline 10 finally outputs power to the caliper mechanism, thereby completing the braking.

[0060] Combination Figure 1 In this invention, the gears are designed in the above-mentioned arrangement (the first gear 12 meshes with the third gear 14, the second gear 13 meshes with the fourth gear 6, the third gear 14 is located on the lower end face of the second gear 13, and the support plate 11 is located on the side of the third gear 14). According to the above-mentioned arrangement of the gear transmission mechanism 3, a support plate 11 is added between the fourth gear 6 and the sun gear 7, which effectively utilizes the axial clearance between the fourth gear 6 and the sun gear 7. This avoids the increase in axial dimension and provides stable support force for the fourth gear 6, thereby improving the installation accuracy, stability and service life of the gear transmission mechanism 3.

[0061] Furthermore, such as Figure 1 As shown, in the above embodiment, the gear transmission mechanism 3 further includes a motor magnet 26. The motor magnet 26 is used to generate a magnetic field. By cooperating with a Hall sensor, a magnetoelectric sensor, or other magnetic sensors, the rotational speed and position of the motor 2 can be detected, thereby monitoring the operating status of the motor. The motor magnet 26 is axially aligned with the first gear 12 (e.g., ...). Figure 1 The gears are aligned in the Z direction and positioned above the first gear 12. This also reduces the axial Z-axis dimension of the gear transmission mechanism 3. Specifically, this invention designs the gears in the above-described arrangement (e.g., Figure 1 As shown, the first gear 12 meshes with the third gear 14, and the second gear 13 meshes with the fourth gear 6. The third gear 14 is located on the lower end face of the second gear 13, and the support plate 11 is located beside the third gear 14. The first gear 12 is sleeved on the motor output shaft 2.1, and the motor magnet 26 is fixed to one end of the motor output shaft 2.1. This arrangement allows the space above the first gear 12 to accommodate the motor magnet 26, without increasing the axial Z-axis dimension of the gear transmission assembly 3. Compared to the prior art where the first gear 12 meshes with the second gear 13, the third gear 14 is located on the lower end face of the second gear 13 and meshes with the fourth gear 6, and then the motor magnet 26 is mounted on the first gear 12, the arrangement provided by this invention utilizes the space above the first gear 12, thereby effectively reducing the axial Z-axis dimension of the gear transmission assembly 3.

[0062] Further, referring to Figures 1-2 In the above embodiments, the support plate 11 is provided with a clearance gap 15 at one end close to the third gear 14, and the clearance gap 15 is used to provide clearance for the third gear 14 so that the third gear 14 can rotate. The clearance gap 15 avoids direct contact between the support plate 11 and the third gear 14, reduces the interference between the two during operation, and thus improves the stability and service life of the support plate 11. In addition, it ensures that the third gear 14 has enough space to rotate near the support plate 11 and will not be hindered from normal operation by the presence of the support plate 11.

[0063] Further, referring to Figure 2 , Figures 4-5 In the above embodiments, the primary transmission gear assembly 4 further includes a first pin shaft 16 passing through the second gear 13 and the third gear 14, and the gear box 1 is provided with a positioning pin hole 17 for cooperating with the first pin shaft 16 to press-fit the primary transmission gear assembly 4 in the gear box 1. By cooperating the first pin shaft 16 with the positioning pin hole 17 in the gear box 1, the primary transmission gear assembly 4 can be accurately positioned in the gear box 1, thereby improving the installation accuracy and transmission efficiency of the gear transmission mechanism 3.

[0064] Further, as shown in Figure 7 In the above embodiments, the second gear 13 and the third gear 14 are in sliding cooperation with the first pin shaft 16. Sliding cooperation can reduce the rigid contact between the gears and the pin shaft, thereby reducing the noise that may be generated during operation. Alternatively, as shown in Figure 8 A first bearing 18 is provided between the second gear 13, the third gear 14 and the first pin shaft 16. The bearing can distribute the load between the gears and the first pin shaft 16, reducing wear and thus prolonging the service life of the gears and the first pin shaft 16.

[0065] Further, referring to Figures 1-2 In the above embodiments, the planetary gear transmission assembly 8 further includes a planetary carrier 19, a plurality of planetary gears 9 being assembled on a first end face 19.1 of the planetary carrier 19, and the output spline 10 being assembled on a second end face 19.2 of the planetary carrier 19, the first end face 19.1 and the second end face 19.2 being opposite faces of the planetary carrier 19. Among them, the central position of the upper end face of the sun gear 7 is provided with a first positioning part 20 cooperating with the fourth gear 6, and the central position of the lower end face of the sun gear 7 is provided with a second positioning part (not shown in the figure) cooperating with the planetary carrier 19, and the sun gear 7 is positioned between the fourth gear 6 and the planetary carrier 19 through the first positioning part 20 and the second positioning part. The arrangement can ensure accurate positioning of the sun gear 7 between the fourth gear 6 and the planetary carrier 19, thereby improving the installation accuracy and stability of the gear transmission mechanism 3.

[0066] Further, with reference to Figure 2 In the above embodiment, the planet carrier 19 is a circular table structure, the planetary gear transmission assembly 8 includes three planetary gears 9, and the first end surface 19.1 of the planet carrier 19 is uniformly provided with three planet gear shafts 30. The three planetary gears 9 are assembled one by one with the three planet gear shafts 30, so that the three planetary gears 9 are rotatably assembled on the first end surface 19.1 of the planet carrier 19.

[0067] The planetary gear transmission assembly 8 further includes a sun gear positioning shaft 31 provided on the planet carrier 19, which is used to assemble with the sun gear 7, for example, the second positioning part of the sun gear 7. The sun gear positioning shaft 31 is located at the center of the planet carrier 19 and is located on the same side as the plurality of planetary gears 9. In this way, the sun gear 7 can be precisely positioned.

[0068] Further, in the above embodiment, the second positioning part is an annular cylinder, and the planet carrier 19 is correspondingly provided with a positioning slot hole; or the second positioning part is a positioning slot hole, and the planet carrier 19 is correspondingly provided with an annular cylinder; wherein the annular cylinder is inserted into the positioning slot hole to position one end of the sun gear 7 on the planet carrier 19. By inserting the annular cylinder into the positioning slot hole, the movement of the sun gear 7 in the axial direction Z can be effectively limited, preventing axial movement and ensuring that the sun gear 7 is positioned at a specified position on the planet carrier 19. In addition, the above positioning method also simplifies the assembly process and improves the assembly efficiency.

[0069] Further, in the above embodiment, as shown in Figure 3 The outer periphery of the planet carrier 19 is provided with a second bearing 22, and the planet carrier 19 is positioned in the gear box 1 through the second bearing 22. On the one hand, by using the second bearing 22, the direct contact between the planet carrier 19 and the inner wall of the gear box 1 can be reduced, thereby reducing wear and prolonging the service life of the gear transmission mechanism 3 and the gear box 1. On the other hand, the second bearing 22 can provide support for the planet carrier 19, allowing it to rotate stably in the gear box 1 while fixing it in the correct position to prevent unnecessary movement in the axial or radial direction. In particular, the second bearing 22 is a rolling bearing or a sliding bushing. Alternatively, the outer periphery of the planet carrier 19 is provided with a bushing 32 (see Figure 4 ), and the planet carrier 19 is positioned in the gear box 1 through the bushing 32. On the one hand, the bushing 32 can ensure the predetermined position of the planet carrier 19 in the gear box 1, preventing it from moving axially or radially during operation, thereby ensuring the accuracy of the installed gear transmission mechanism 3. On the other hand, the bushing 32 can also reduce the direct contact between the planet carrier 19 and the inner wall of the gear box 1, reducing wear and prolonging the service life of the gear box 1. In particular, as shown in Figure 4As shown, a second bearing 22 is provided on the outer periphery of the planetary gear carrier 19, and a bushing 32 is provided on the outer periphery of the second bearing 22. The planetary gear carrier 19 is positioned inside the gearbox 1 by means of the bushing 32. When the support plate 11 is fixed to the gearbox 1 by welding (the support plate 11 and the gearbox 1 are an integral structure), since the planetary gear carrier 19 needs to be installed in the gearbox 1 from bottom to top along the Z-axis, the bushing 32 can be designed as an integral structure with the gearbox 1 housing. The bushing 32 can effectively fix and support the second bearing 22, thereby ensuring the predetermined position of the planetary gear carrier 19 inside the gearbox 1. When the support plate 11 is fixed to the gearbox 1 by riveting, the planetary gear carrier 19 needs to be installed in the gearbox 1 from top to bottom along the Z-axis. In this case, the bushing 19 is not required, and the planetary gear carrier 19 can be fixed inside the gearbox 1 by means of the second bearing 22.

[0070] Furthermore, such as Figure 4 As shown, and refer to Figure 5 The planetary gear carrier 19 has a second bearing 22 on its outer periphery, a bushing 32 on its outer periphery, and a retaining ring 33 fitted around the bushing 32. The inner wall of the gearbox 1 has a retaining groove 29. The retaining ring 33 engages with the retaining groove 29 to secure the planetary gear carrier 19 within the gearbox 1. For example, the retaining groove 29 can be a concave groove. When the retaining ring 33 is pressed into the groove and reaches the correct position, the radial pressure it receives will cause it to press tightly against the side wall of the groove, thereby stably fixing the bushing 32 and the planetary gear carrier 19 in a predetermined position within the gearbox 1. The retaining groove 29 can also be an annular step (e.g., Figure 5 As shown, when the retaining ring 33 is pressed into the platform of the annular step, it will generate a restoring force due to elastic deformation. This restoring force will cause the retaining ring 33 to adhere tightly to the platform, thereby stably fixing the planetary gear carrier 19 in the predetermined position within the gearbox 1. This can further improve the installation accuracy and avoid noise generated during the operation of the gear transmission mechanism 3. Specifically, when the support plate 11 is fixed to the gearbox 1 by welding (the support plate 11 and the gearbox 1 are an integral structure), since the planetary gear carrier 19 needs to be installed in the gearbox 1 from bottom to top along the Z-axis, in order to achieve the fixation and support of the second bearing 22 and thus ensure the predetermined position of the planetary gear carrier 19 within the gearbox 1, a retaining ring 33 can be fitted around the outer circumference of the bushing 32. The planetary gear carrier 19 can be stably fixed within the gearbox 1 by the cooperation of the retaining ring 33 and the retaining groove 29. When the support plate 11 is fixed in the gearbox 1 by riveting, the planetary gear carrier 19 needs to be installed in the gearbox 1 from top to bottom along the Z axis. At this time, there is no need to set the retaining ring 33. The planetary gear carrier 19 can be fixed in the gearbox 1 by the second bearing 22.

[0071] Furthermore, in the above embodiments, such as Figures 10-11As shown, the bottom 19.3 of the planet carrier 19 is provided with an extension cavity 37, the output spline 10 includes an engaging area and an extension area, the engaging area is embedded in the extension cavity 37, and the extension area extends from the extension cavity 37 and is matched with the inner spline hole of the end of the screw rod in the caliper assembly to output the driving force to the screw rod. The extension cavity 37 can improve the strength of the planet carrier 19 itself and the connecting strength of the output spline 10, and help to distribute the load more evenly on the planet carrier 19, so as to reduce the stress concentration around the engaging area, thereby prolonging the service life of the output spline 10 and the planet carrier 19. The extension cavity 37 can be embedded in the planet carrier 19 or not. In particular, the extension cavity 37 is embedded in the planet carrier 19, thereby increasing the contact area between the engaging area and the planet carrier 19, improving the strength and stability of the connection, and further ensuring the braking effect.

[0072] Further, in the above embodiment, as shown in Figure 9 , the output spline 10 includes an extension area 10.2, which extends from the bottom 19.3 of the planet carrier 19 and is matched with the inner spline hole of the end of the screw rod in the caliper assembly to output the driving force to the screw rod. The planet carrier 19 is stably fixed in the gear box 1, so that the stress is small, and therefore the extension cavity can be directly matched with the inner spline hole of the end of the screw rod in the caliper assembly to output the driving force to the screw rod. Thus, the size of the spline 10 in the axial direction Z can also be reduced, thereby reducing the size of the gear transmission assembly 4. The extension area 10.2 can be embedded in the bottom 19.3 of the planet carrier 19 or not (the extension area 10.2 is integrally formed with the planet carrier 19). In particular, as shown in Figure 9 , the extension area is embedded in the bottom 19.3 of the planet carrier 19, thereby improving the stability of the installation, and further ensuring the braking effect.

[0073] Further, with reference to Figures 1-2 and in combination with Figure 5In the above embodiment, the planet carrier 19 is in a cantilever structure, and the inner wall of the gear box 1 is provided with a clamping groove 29 matched with the cantilever structure, so as to facilitate the accurate positioning of the planet carrier 19 in the gear box 1. Specifically, the gear box 1 is provided with a clamping groove 29 (annular step) corresponding to the region of the second-stage transmission gear assembly 5, that is, the second-stage transmission gear assembly 5 is arranged above the annular step, and the outer ring gear 27 is press-fitted in the clamping groove 29, so as to fix the outer ring gear 27 in the gear box 1. The outer ring gear 27 is provided with a mounting portion, and the surface of the clamping groove 29 is provided with a matching portion. The outer ring gear 27 is press-fitted in the gear box 1 through the matching assembly of the mounting portion and the matching portion. In order to ensure the stability of the outer ring gear 13 and avoid twisting during transmission, the mounting portion is at least two, and the number of the matching portion is the same as and corresponds to the number of the mounting portion. In particular, the mounting portion is six, which are uniformly arranged in sequence on the outer periphery of the outer ring gear 1.

[0074] Specifically, as shown in Figure 2 , in the above embodiment, the mounting portion is an anti-rotation boss 28 provided on the outer ring gear 27, and the anti-rotation boss 28 extends from the press-fitting surface of the outer ring gear 27. The press-fitting surface is an end surface in the direction of the central axis of the outer ring gear 27, and the matching portion is a positioning hole 34 on the surface of the clamping groove 29 (see Figure 5 ). After the outer ring gear 27 is assembled, the press-fitting surface is in contact with the surface of the clamping groove 29. In addition, the other end surface of the outer ring gear 27 opposite to the press-fitting surface is a reference surface for linear press-fitting. The outer ring gear 27 and the gear box 1 are assembled by interference fit as a whole, so as to ensure the stability of the fixing of the outer ring gear 27.

[0075] Further, referring to Figure 2 , in the above embodiment, the central position of the upper end surface of the support plate 11 is provided with a limiting hole 23, and the central position of the lower end surface of the fourth gear 6 is provided with a third positioning portion 24, and the third positioning portion 24 is sleeved with a third bearing 25, and the third bearing 25 is fixed on the support plate 11 by being embedded in the limiting hole 23. The cooperation of the limiting hole 23 and the third positioning portion 24 ensures the accurate positioning of the fourth gear 6 on the support plate 11, reduces the deviation of the gear during operation, and improves the installation accuracy and transmission efficiency. The third bearing 25 not only enables the gear to rotate stably and not to move due to external force, but also reduces the direct contact between the fourth gear 6 and the support plate 11, thereby reducing friction and wear, and prolonging the service life of the fourth gear 6 and the support plate 11.

[0076] Further, in the above embodiment, the material of the support plate 11 is metal or powder metallurgy. Metal or powder metallurgy usually has high mechanical strength and rigidity, and can withstand large force and torque. The use of a support plate 11 made of metal or powder metallurgy to position the fourth gear 6 can effectively provide stable support force for the fourth gear 6.

[0077] Further, in the above embodiments, the gear box 1 is made of metal or plastic. When choosing plastic material, the cost of the gear box 1 can be reduced, but the transmission efficiency is not as good as the gear box 1 made of metal. In particular, the gear box 1 of the utility model is made of metal material. Compared with the plastic gear box, the metal gear box has higher strength and rigidity. The gear transmission assembly 3 is integrated in the gear box 1, and the metal material is used, so that the gear box 1 can provide sufficient support strength to fix the gear transmission mechanism 3. Therefore, not only the installation accuracy and consistency are improved, but also the excessive vibration and noise of the gear at high speed are avoided, so that the service life and transmission efficiency of the gear transmission mechanism 3 are significantly improved.

[0078] Further, as shown in Figure 4 The gear box 1 is further provided with a force sensor connector channel 36. During assembly, only the force sensor connector 21 needs to be inserted into the force sensor connector channel 36, and then the cover plate 35 is covered on the gear box 1, so that the force sensor connector 21 (used for connecting the force sensor in the caliper assembly with the controller, so that the data collected by the force sensor can be transmitted to the controller, thereby facilitating the monitoring of the working state of the caliper assembly) can be stably installed in the gear box 1.

[0079] Although the utility model has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above is a further detailed description of the utility model in combination with specific embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. Those skilled in the art can make various changes in form and details, including making a number of simple inferences or substitutions, without departing from the spirit and scope of the utility model.

Claims

1. An electromechanical brake actuator, characterized by The application relates to a gear box, a motor installed in the gear box, a gear transmission mechanism installed in the gear box and in transmission connection with the motor and used for outputting the driving force of the motor, a primary transmission gear assembly in transmission connection with the motor, a secondary transmission gear assembly in transmission connection with the primary transmission gear assembly and comprising a fourth gear and a sun gear coaxially arranged, the fourth gear being capable of driving the sun gear to rotate, a planetary gear transmission assembly comprising a plurality of planetary gears and an output spline, the sun gear being located at the central position of the plurality of planetary gears and being in mesh with the plurality of planetary gears respectively, the output spline being used for outputting driving force, the central axis of the secondary transmission gear assembly coinciding with the central axis of the planetary gear transmission assembly, and a support plate located between the fourth gear and the sun gear along the axial direction of the gear transmission mechanism, being fixedly connected with the gear box and being used for supporting the fourth gear. The outer edge of the support plate is provided with an extension part which is riveted with the gear box, or the support plate is welded with the gear box. One end of the motor is provided with an output shaft which extends into the gear box, the output shaft being fixed with a first gear, the primary transmission gear assembly comprising a second gear and a third gear coaxially arranged, the first gear being in mesh with the third gear, the second gear being in mesh with the fourth gear, the third gear being arranged at the lower end surface of the second gear, and the support plate being arranged at the side of the third gear. The gear transmission mechanism further comprises a motor magnet which is in axial butt joint with the first gear and is located above the first gear. The end of the support plate close to the third gear is provided with a clearance gap which positions the third gear so that the third gear can rotate. The primary transmission gear assembly further comprises a first pin shaft penetrating the second gear and the third gear, the gear box being provided with a positioning pin hole which is used for cooperating with the first pin shaft so as to press-fit the primary transmission gear assembly in the gear box. The second gear, the third gear and the first pin shaft are in sliding cooperation, or a first bearing is arranged between the second gear, the third gear and the first pin shaft. The planetary gear transmission assembly further comprises a planetary gear carrier, the plurality of planetary gears being assembled at the first end surface of the planetary gear carrier, the output spline being assembled at the second end surface of the planetary gear carrier, the first end surface and the second end surface being opposite surfaces of the planetary gear carrier; 2. The electromechanical brake actuator of claim 1, wherein, The central position of the upper end surface of the sun gear is provided with a first positioning part which cooperates with the fourth gear, the central position of the lower end surface of the sun gear is provided with a second positioning part which cooperates with the planetary gear carrier, and the sun gear is positioned between the fourth gear and the planetary gear carrier through the first positioning part and the second positioning part.

3. The electromechanical brake actuator of claim 1, wherein, ​ 4. The electromechanical brake actuator of claim 3, wherein, ​ 5. The electromechanical brake actuator of claim 3, wherein, ​ 6. The electromechanical brake actuator of claim 3, wherein, ​ 7. The electromechanical brake actuator of claim 6, wherein, ​ 8. The electromechanical brake actuator of claim 1, wherein, ​ ​ 9. The electromechanical brake actuator of claim 8, wherein, The second positioning part is an annular column, and a positioning slot hole is arranged on the planetary gear carrier in correspondence; or the second positioning part is a positioning slot hole, and an annular column is arranged on the planetary gear carrier in correspondence; wherein the annular column is inserted into the positioning slot hole to position one end of the sun gear on the planetary gear carrier.

10. The electromechanical brake actuation apparatus according to claim 8, wherein A second bearing or a bushing is arranged on the outer periphery of the planetary gear carrier; or a second bearing is arranged on the outer periphery of the planetary gear carrier, and a bushing is arranged on the outer periphery of the second bearing, and the planetary gear carrier is positioned in the gear box through the second bearing or the bushing.

11. The electromechanical brake actuation apparatus according to claim 10, wherein A second bearing is arranged on the outer periphery of the planetary gear carrier, a bushing is arranged on the outer periphery of the second bearing, a snap ring is arranged on the outer periphery of the bushing, a clamping groove is arranged on the inner wall of the gear box, and the snap ring is fixed in the gear box through cooperation with the clamping groove.

12. The electromechanical brake actuation apparatus of claim 8, wherein, The planetary gear carrier is provided with an extension cavity at the bottom, the output spline includes an engaging area and an extension area, the engaging area is embedded in the extension cavity, the extension area extends from the extension cavity and cooperates with the inner spline hole at the end of the lead screw in the caliper assembly to output the driving force to the lead screw.

13. The electromechanical brake actuation apparatus of claim 8, wherein, The output spline includes an extension area, the extension area extends from the bottom of the planetary gear carrier and cooperates with the inner spline hole at the end of the lead screw in the caliper assembly to output the driving force to the lead screw.

14. The electromechanical brake actuator of claim 1, wherein, A limiting hole is arranged at the center of the upper end surface of the support plate, the fourth gear is provided with a third positioning part at the center of the lower end surface, the third positioning part is provided with a third bearing on the outer periphery, and the third bearing is fixed on the support plate through being embedded in the limiting hole.

15. The electromechanical brake actuation apparatus according to any one of claims 1 to 14, wherein The material of the support plate is metal; and the material of the gear box is metal or plastic.

16. The electromechanical brake actuation apparatus according to any one of claims 1 to 14, wherein The material of the support plate is powder metallurgy; and the material of the gear box is metal or plastic. The material of the support plate is powder metallurgy; and the material of the gear box is metal or plastic.

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