Electronic mechanical braking device and vehicle

Abstract

The utility model discloses an electronic mechanical braking device, which comprises a caliper component and a gear box component which are connected along a first direction, the gear box component is used for driving the caliper component to brake, the caliper component comprises a ball screw, a brake component and a brake component, the ball screw comprises a threaded section and a rod body section, and one end of the rod body section is provided with an internal spline; the thrust bearing is arranged on the periphery of the rod body section in a sleeving manner; the gasket is arranged on the periphery of the rod body section in a sleeving manner; the ball nut is arranged on the peripheries of the threaded section, the thrust bearing and the gasket in a sleeving mode, and the length of the threaded section in the first direction is smaller than that of the ball nut; the braking part is positioned at one end, far away from the rod body section, of the ball nut; through rotation of the ball screw, the ball nut is driven to move in the first direction so as to push the braking part to move in the first direction for braking. The gear box assembly comprises a gear box; the motor is mounted in the gear box; and the gear transmission mechanism is mounted in the gear box, is in transmission connection with the motor and is used for outputting the driving force for driving the caliper assembly. The utility model further discloses a vehicle.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile braking system, especially relates to an electronic mechanical braking device and vehicle. BACKGROUND

[0002] In the automobile braking system, electronic mechanical braking device needs to be arranged on the steering knuckle (i.e. the horn) of automobile tire in space. At this time, since the need of meeting the up and down jumping limit position in the process of automobile driving and the demand of automobile left and right steering limit position, therefore, electronic mechanical braking device can not interfere with other parts. That is to say, the shorter the electronic mechanical braking device along the axial dimension of automobile tire is, the better.

[0003] Therefore, a new compact electronic mechanical braking device is needed to meet the harsh layout space demand of the whole vehicle. UTILITY MODEL CONTENTS

[0004] To solve the above technical problems, the utility model provides an electronic mechanical braking device and vehicle.

[0005] In a first aspect, the embodiment of the utility model discloses an electronic mechanical braking device, which comprises caliper assembly and gear box assembly connected along the first direction, and the gear box assembly is used to drive the caliper assembly to brake,

[0006] The caliper assembly comprises:

[0007] Ball screw rod, comprising thread segment and rod body segment distributed along the first direction, and the rod body segment is provided with internal spline at one end;

[0008] Thrust bearing, which is sleeved on the outer periphery of the rod body segment;

[0009] Gasket, which is sleeved on the outer periphery of the rod body segment;

[0010] Ball nut, which is sleeved on the outer periphery of the thread segment, the thrust bearing and the gasket, and the length of the thread segment along the first direction is less than the length of the ball nut;

[0011] Braking part, which is located at the end of the ball nut away from the rod body segment;

[0012] Through the rotation of the ball screw rod, the ball nut is driven to move along the first direction to push the braking part to move along the first direction to brake;

[0013] The gear box assembly comprises:

[0014] Gear box;

[0015] Motor, which is installed in the gear box;

[0016] A gear transmission mechanism is installed in the gear box and is in transmission connection with the motor, and is used for outputting driving force for driving the caliper assembly, comprising:

[0017] A primary transmission gear assembly is in transmission connection with the motor;

[0018] A secondary transmission gear assembly is in transmission connection with the primary transmission gear assembly, comprising a fourth gear and a sun gear arranged coaxially, and the fourth gear can drive the sun gear to rotate;

[0019] A planetary gear transmission assembly comprises a plurality of planetary gears and the output spline, the sun gear is located at the center position of the plurality of planetary gears and is in meshing connection with the plurality of planetary gears respectively, and the output spline is connected with the inner spline and is used for outputting driving force to the ball screw;

[0020] A support plate is located between the fourth gear and the sun gear along the first direction, is fixedly connected with the gear box, and is used for supporting the fourth gear.

[0021] The technical scheme can effectively reduce the axial size of the electromechanical brake device, avoid interference with other components, and meet the harsh layout space requirement.

[0022] According to another specific embodiment of the utility model, the outer periphery of the threaded section is provided with a plurality of circulation loops independently distributed along the first direction, the circulation loops are provided with balls, and the balls enable the ball screw to drive the ball nut to move along the first direction.

[0023] According to another specific embodiment of the utility model, the caliper assembly further comprises:

[0024] A caliper shell has a containing cavity extending along the first direction, and the ball nut is contained in the containing cavity;

[0025] A first friction part is arranged on the side wall of the containing cavity along the first direction, the ball nut passes through the first friction part and is in sliding connection with the first friction part, the first friction part is located between the containing cavity and the ball nut along a second direction, so that the ball nut is arranged in a spaced manner with the side wall of the containing cavity, and the second direction is perpendicular to the first direction;

[0026] Wherein, along the first direction, the length of the contact part of the first friction part with the containing cavity is less than the length of the containing cavity.

[0027] According to another specific embodiment of the utility model, the first friction part comprises a friction ring, the friction ring is arranged on the side of the containing cavity close to the brake part and extends along a third direction;

[0028] The friction ring has a first through hole penetrating through the first friction part along the first direction, the ball nut passes through the first through hole and is in sliding connection with the friction ring, and the third direction surrounds the first direction;

[0029] In the first direction, the length of the friction ring is less than the length of the accommodating cavity.

[0030] According to another specific embodiment of the utility model, the caliper shell is provided with an opening, the opening is in communication with the accommodating cavity, and the rod body segment passes through the opening in the first direction to be connected with the gear box assembly.

[0031] The caliper assembly further comprises a second friction part provided on the hole wall of the opening and having a second through hole penetrating through the second friction part along the first direction, the rod body segment passes through the second through hole and is in sliding connection with the second friction part, and in the second direction, the second friction part is located between the rod body segment and the hole wall of the opening.

[0032] According to another specific embodiment of the utility model, the second friction part comprises a friction bushing provided on the hole wall of the opening and extending along a third direction, the rod body segment passes through the friction bushing and is in sliding connection with the friction bushing.

[0033] According to another specific embodiment of the utility model, the outer wall of the friction bushing has a convex part, in the first direction, the convex part is provided at one end of the outer wall of the friction bushing away from the accommodating cavity, the hole wall of the opening has a concave part corresponding to the convex part, the convex part is accommodated in the concave part and abuts against the concave part to limit the movement of the friction bushing relative to the opening along the first direction.

[0034] According to another specific embodiment of the utility model, the side wall of the accommodating cavity further comprises a limiting recess extending along the first direction, and the outer wall of the ball nut comprises a rotation-stopping boss corresponding to the limiting recess, the rotation-stopping boss being provided on the outer wall of the ball nut.

[0035] The rotation-stopping boss is configured to be accommodated in the limiting recess to limit the rotation of the ball nut relative to the accommodating cavity along the third direction and enable the movement of the ball nut relative to the limiting recess along the first direction.

[0036] According to another specific embodiment of the utility model, the caliper assembly further comprises a dust cover, the outer wall of the ball nut is provided with a fixing groove, the outer side end of the dust cover is connected to the caliper shell along the second direction, the inner side end of the dust cover is sleeved on the outer wall of the ball nut and accommodated in the fixing groove, so that the inner side end of the dust cover can follow the ball nut to stretch and contract relative to the caliper shell along the first direction.

[0037] According to another specific embodiment of the utility model, the outer edge of the support plate is provided with an extension part, and the extension part is riveted with the gear box.

[0038] According to another specific embodiment of the utility model, 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 coaxially arranged second and third gears, the first gear is engaged with the third gear, the second gear is engaged with the fourth gear, the third gear is arranged on the lower end face of the second gear, and the support plate is arranged on the side of the third gear.

[0039] According to another specific embodiment of the utility model, the gear transmission mechanism further comprises a motor magnet, the motor magnet is axially butted with the first gear and located above the first gear.

[0040] According to another specific embodiment of the utility model, one end of the support plate close to the third gear is provided with a clearance gap, the clearance gap is arranged for the third gear, so that the third gear can rotate.

[0041] According to another specific embodiment of the utility model, the primary transmission gear assembly further comprises a first pin shaft penetrating the second and third gears, the gear box is provided with a positioning pin hole, and 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.

[0042] According to another specific embodiment of the utility model, the second gear, the third gear and the first pin shaft are in sliding fit, or a first bearing is arranged between the second gear, the third gear and the first pin shaft.

[0043] According to another specific embodiment of the utility model, the planetary gear transmission assembly further comprises a planetary wheel carrier, the plurality of planetary wheels are assembled on the first end face of the planetary wheel carrier, the output spline is assembled on the second end face of the planetary wheel carrier, and the first end face and the second end face are opposite two faces of the planetary wheel carrier.

[0044] The central position of the upper end surface of the sun gear is provided with a first positioning part matched with the fourth gear, and the central position of the lower end surface of the sun gear is provided with a second positioning part matched with the planet carrier, and the sun gear is positioned between the fourth gear and the planet carrier through the first positioning part and the second positioning part.

[0045] According to another specific embodiment of the utility model, 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 a positioning slot hole, and an annular column is correspondingly arranged on the planet carrier; wherein the annular column is inserted into the positioning slot hole to position one end of the sun gear on the planet carrier.

[0046] According to another specific embodiment of the utility model, a second bearing or a bushing is arranged on the 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 the outer periphery of the second bearing, and the planet carrier is positioned in the gear box through the second bearing or the bushing.

[0047] According to another specific embodiment of the utility model, a second bearing is arranged on the outer periphery of the planet 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 clamped in the clamping groove to fix the planet carrier in the gear box.

[0048] According to another specific embodiment of the utility model, an extension cavity is arranged at the bottom of the planet carrier, the output spline includes an engaging area and an extension area, the engaging area is embedded in the extension cavity, and the extension area extends from the extension cavity and is matched with the inner spline to output the driving force to the ball screw.

[0049] According to another specific embodiment of the utility model, the output spline includes an extension area, the extension area extends from the bottom of the planet carrier and is matched with the inner spline to output the driving force to the ball screw.

[0050] According to another specific embodiment of the utility model, a limiting hole is arranged at the central position of the upper end surface of the supporting plate, a third positioning part is arranged at the central position of the lower end surface of the fourth gear, a third bearing is arranged on the outer periphery of the third positioning part, and the third bearing is embedded in the limiting hole to fix the fourth gear on the supporting plate.

[0051] In the second aspect, the embodiment of the utility model discloses a vehicle, which comprises the electromechanical brake device in any one of the embodiments of the first aspect, and the gear box assembly can drive the brake part to move in the first direction to brake the vehicle.

[0052] By adopting the technical scheme, the electromechanical brake device 0 is compact in axial dimension, interference with other components is avoided, and driving safety and brake stability are improved. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 A perspective view of an electromechanical brake device according to an embodiment of the present application is shown.

[0054] Figure 2 A cross-sectional view of a caliper assembly according to an embodiment of the present application is shown.

[0055] Figure 3 An exploded view of a caliper assembly according to an embodiment of the present application is shown.

[0056] Figure 4 An exploded view of Figure 2 A partial enlarged view of region A is shown.

[0057] Figure 5 An exploded view of a gear box assembly and a controller assembly according to an embodiment of the present application is shown.

[0058] Figure 6 A partial cross-sectional view of a gear box assembly according to an embodiment of the present application is shown.

[0059] Figure 7 An exploded view of a gear box assembly according to another embodiment of the present application is shown.

[0060] Figure 8 An exploded view of an electromechanical brake device according to an embodiment of the present application is shown.

[0061] 0. electromechanical brake device, 1. caliper assembly, 10. bracket assembly, 11. caliper housing, 111. accommodating cavity, 1111. limiting groove, 112. end cover, 113. opening, 12. brake part, 121. friction plate, 123. accommodating space, 13. ball screw, 130. ball, 131. ball nut, 1311. rotation-stopping boss, 132. ball screw rod, 1321. threaded segment, 1322. rod segment, 13221. inner spline, 14. friction assembly, 141. friction ring, 142. friction bushing, 1421. convex part, 15. thrust bearing, 16. gasket, 161. supporting gasket, 162. flat gasket, 17. dust cover, 18. force sensor, 102. sealing ring

[0062] 2. Gear box assembly, 21. Gear box, 211. Card slot, 212. Force sensor connector channel, 22. Motor, 221. Output shaft, 222. First gear, 23. Gear transmission mechanism, 231. Primary transmission gear assembly, 2311. Second gear, 231102. First pin shaft, 2312. Third gear, 232. Secondary transmission gear assembly, 2321. Fourth gear, 2322. Sun gear, 233. Planetary gear transmission assembly, 2331. Planet gear, 2332. Output spline, 2333. Planet carrier, 234. Support plate, 2341. Let out notch, 2342. Extension, 2343. Limiting hole, 235. First positioning part, 236. Third positioning part, 237. Second bearing, 238. Third bearing, 239. Motor magnet, 240. Outer ring gear, 2401. Anti-rotation boss, 241. Force sensor connector, 242. Cover plate, 243. Bushing, 244. Clasp, 245. Positioning pin hole, 3. Controller assembly

[0063] X. First direction, Y. Second direction, Z. Third direction DETAILED DESCRIPTION

[0064] The other advantages and effects of the present application can be easily understood by those skilled in the art from the content disclosed in the present specification. Although the description of the present application will be introduced in combination 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 in combination with the embodiments is to cover other options or modifications which 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.

[0065] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0066] The terms "first", "second", and the like are only used to distinguish description, and cannot be understood as indicating or implying relative importance.

[0067] 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.

[0068] 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.

[0069] Firstly, such as Figures 1-8 As shown, an embodiment of this utility model discloses an electromechanical braking device 0, comprising a first direction (the first direction can be understood as the axial direction of the electromechanical braking device 0, for example...) Figure 1 , Figure 2 , Figure 5 and Figure 6 The caliper assembly 1, gearbox assembly 2, and controller assembly 3 are connected in the X direction shown. The gearbox assembly 2 is used to drive the caliper assembly 1 to brake.

[0070] The caliper assembly 1 includes a ball screw 132, a thrust bearing 15, a washer 16, and a ball nut 131. The ball screw 132 includes a threaded section 1321 and a rod section 1322 distributed along a first direction. One end of the rod section 1322 has an internal spline 13221; specifically, the end of the rod section 1322 away from the threaded section 1321 has the internal spline 13221. The thrust bearing 15 is sleeved on the outer periphery of the rod section 1322; the washer 16 is sleeved on the outer periphery of the rod section 1322. The ball nut 131 is sleeved on the outer periphery of the threaded section 1321, the thrust bearing 15, and the washer 16. The length of the threaded section 1321 along the first direction is less than the length of the ball nut 131. The braking part 12 is located at the end of the ball nut 131 away from the rod section 1322.

[0071] That is to say, the ball nut 131 is in the initial position (e.g. Figure 2 When the ball nut 131 is in the initial position (as shown), both the thrust bearing 15 and the washer 16 are located inside the ball nut 131. It should be noted that the thrust bearing 15 and the washer 16 are indispensable components of the caliper assembly 1. In the prior art, when the ball nut 131 is in the initial position, the thrust bearing and washer can only be located outside the ball nut. Therefore, compared to the prior art, this invention places the thrust bearing 15 and the washer 16 inside the ball nut 131, reducing the axial dimension of the caliper assembly 1 and making the structure more compact.

[0072] Further, the gasket 16 comprises a supporting gasket 161 and a flat gasket 162. Exemplarily, in the embodiment of the present application, the outer periphery of the rod body segment 1322 is sequentially sleeved with the supporting gasket 161, the thrust bearing 15 and the flat gasket 162 in the first direction, and the ball nut 131 is sleeved on the outer periphery of the threaded segment 1321, the supporting gasket 161, the thrust bearing 15 and the flat gasket 162. That is, the supporting gasket 161 and the flat gasket 162 are respectively located on both sides of the thrust bearing 15 in the first direction, and the surfaces thereof are in rolling contact with the rollers of the thrust bearing 15, thereby playing a role of transmitting axial force.

[0073] Further, the caliper assembly 1 further comprises a force sensor 18 for measuring the size of the clamping force of the caliper assembly 1. The force sensor 18 is sleeved on the outer periphery of the rod body segment 1322 and abuts against the flat gasket 162 in the first direction, and the ball nut 131 is sleeved on the outer periphery of the threaded segment 1321, the supporting gasket 161, the thrust bearing 15, the flat gasket 162 and the force sensor 18, thereby further optimizing the size of the caliper assembly 1 in the first direction.

[0074] Specifically, the electronic mechanical brake device 0 of the embodiment of the present application is applied to the braking of a vehicle wheel, and the brake portion 12 of the embodiment of the present application is a friction plate 121. An end cover 112 is arranged between the ball nut 131 and the friction plate 121 close to the accommodating cavity 111. One end of the end cover 112 is connected to the ball nut 131, and the other end of the end cover 112 is connected to the friction plate 121. That is, the rotation of the ball screw 132 is converted into the linear motion of the ball nut 131, and the brake portion 12 is driven to move in the first direction towards the brake disc (not shown in the figure) of the vehicle wheel, thereby clamping the brake disc to achieve the braking of the vehicle.

[0075] The gear box assembly 2 comprises a gear box 21, a motor 22 and a gear transmission mechanism 23. The motor 22 and the gear transmission mechanism 23 are both installed in the gear box 21. The gear transmission mechanism 23 is in driving connection with the motor 22 and is used for outputting driving force for driving the caliper assembly 1. The gear transmission mechanism 23 comprises a primary transmission gear assembly 231, a secondary transmission gear assembly 232, a planetary gear transmission assembly 233 and a support plate 234.

[0076] Specifically, the primary transmission gear assembly 231 is in driving connection with the motor 22. The secondary transmission gear assembly 232 is in driving connection with the primary transmission gear assembly 231 and comprises a fourth gear 2321 and a sun gear 2322 arranged coaxially. The fourth gear 2321 can drive the sun gear 2322 to rotate.

[0077] The planetary gear transmission assembly 233 comprises a plurality of planetary gears 2331 and an output spline 2332, and a sun gear 2322 is located at the center of the plurality of planetary gears 2331 and is engaged with the plurality of planetary gears 2331 respectively. Preferably, the planetary gears 2331 are arranged opposite to the fourth gear 2321 along the first direction. The output spline 2332 is connected with the inner spline 13221 along the first direction, and is used for outputting driving force to the ball screw 13. That is, the output spline 2332 outputs driving force to the ball screw 13, and then drives the ball screw 13 to rotate, so as to drive the ball nut 131 to move along the first direction, and drive the brake part 12 to move along the first direction for braking.

[0078] A support plate 234 is located between the fourth gear 2321 and the sun gear 2322 along the first direction, and is fixedly connected with the gear box 21, and is used for supporting the fourth gear 2321.

[0079] Therefore, the motor 2 and the gear transmission mechanism 3 are integrated in the gear box 21, the installation precision and stability of the secondary transmission gear assembly 232 can be improved, excessive vibration and noise of the gear during high-speed operation can be avoided, and the service life and transmission efficiency of the gear transmission mechanism 23 can be improved.

[0080] Specifically, the support plate 234 is additionally arranged between the fourth gear 2321 and the sun gear 2322, the support plate 234 is fixed in the gear box 21, then the fourth gear 2321 is fixed on the support plate 234 by taking the support plate 234 as a positioning base point, the sun gear 2322 is coaxially arranged with the fourth gear 2321, and the rotation of the fourth gear 2321 can drive the sun gear 2322 to rotate, so that the support plate 234 can not only support and fix the fourth gear 2321, but also can accurately position the sun gear 2322. Then, the installed secondary transmission gear assembly 232 is assembled in the gear box 21, so that the installation precision, stability and consistency of the gear transmission mechanism 23 are improved, excessive vibration and noise of the gear during high-speed operation can be avoided, and the service life and transmission efficiency of the gear transmission mechanism 23 can be improved.

[0081] With the technical scheme, on one hand, the thrust bearing 15 and the gasket 16 in the caliper assembly 1 can be arranged inside the ball nut 131, reducing the axial dimension of the caliper assembly 1 and making the structure more compact. On the other hand, the installation precision and stability of the secondary transmission gear assembly 232 can be improved, avoiding excessive vibration and noise of the gear during high-speed operation, and improving the service life and transmission efficiency of the gear transmission mechanism 23. In addition, the caliper assembly 1 and the gear box assembly 2 are connected in the first direction through the inner spline 13221 and the output spline 2332, reducing the combined height of the caliper assembly 1 and the gear box assembly 2, and not increasing the axial dimension. Therefore, through the mutual cooperation of the above technical features, the axial dimension of the electronic mechanical brake device 0 of the utility model is the most compact.

[0082] In some other possible embodiments of the utility model, the outer periphery of the threaded segment 1321 is provided with a plurality of circulation loops independently distributed in the first direction, and the circulation loops are provided with the ball 130. The ball 130 enables the ball screw 132 to drive the ball nut 131 to move in the first direction. Specifically, the threaded segment 1321 rotates, thereby driving the ball 130 to roll, so that the rolling of the ball 130 is converted into the movement of the ball nut 131 in the first direction. Therefore, compared with the prior art, the ball 130 of the utility model only needs to roll in the circulation loop, without moving in the first direction. Therefore, compared with the prior art, the utility model shortens the dimension of the threaded segment 1321 in the first direction without affecting the movement stroke of the ball nut 131 in the first direction, thereby providing more space for installing other components, such as the supporting gasket 161, the thrust bearing 15, the flat gasket 162 and the force sensor 18, so that the axial dimension of the caliper assembly 1 is compact.

[0083] Continuing to refer to Figure 2 and Figure 3 , the caliper assembly 1 further comprises a caliper shell 11 and a friction assembly 14.

[0084] Specifically, the caliper shell 11 has a containing cavity 111. Exemplarily, the containing cavity 111 extends in the first direction, and the ball nut 131 is contained in the containing cavity 111.

[0085] As Figure 3As shown, the electromechanical braking device 0 of this utility model also includes a bracket assembly 10, which is connected to the caliper housing 11 along a first direction. In this embodiment, the bracket assembly 10 is provided with two friction plates 121, spaced apart along the first direction. The friction plate 121 near the receiving cavity 111 can be pushed by the ball nut 131, while the friction plate 122 on the other side is fixed to one end of the bracket assembly 10, together defining a receiving space 123 for accommodating the brake disc of the wheel. For ease of explanation, the braking part 12 of this embodiment is described using the friction plate 121 near the receiving cavity 111 as an example. Thus, the ball nut 131 of this embodiment can push the friction plate 121 to move along the first direction toward the vehicle's brake disc (not shown in the figure) to brake the vehicle. Exemplarily, the first direction is parallel to the wheel's axial direction.

[0086] The aforementioned friction assembly 14 is disposed on the caliper housing 11. Furthermore, the friction assembly 14 in this embodiment of the application all have through holes through which the ball nut 131 and the rod segment 1322 can pass. The friction assembly 14 in this embodiment of the application includes a first friction part and a second friction part. Exemplarily, the first friction part in this embodiment of the application is a friction ring 141, and the second friction part is a friction bushing 142. However, this is not a limitation; the structure of the friction assembly 14 in this embodiment of the application is not specifically limited, as long as it can be used to slide with the ball nut 131 and the rod segment 1322 respectively, so as to reduce the frictional resistance between the ball nut 131 and the rod segment 1322 and the caliper housing 11 respectively.

[0087] For ease of explanation, the friction assembly 14 of this application embodiment is described below with the first friction part being a friction ring 141 and the second friction part being a friction bushing 142 as an example.

[0088] In other words, along the first direction, the ball nut 131 of this embodiment passes through the friction ring 141 and is slidably connected to the friction ring 141. And along the second direction (i.e., the radial direction of the receiving cavity 111, such as...) Figure 2 (As shown in the Y direction), the friction ring 141 is located between the caliper housing 11 and the ball nut 131. That is, along the second direction, the ball nut 131, the friction ring 141, and the receiving cavity 111 are arranged sequentially, so that the ball nut 131 and the receiving cavity 111 are spaced apart.

[0089] Therefore, the ball nut 131 of the embodiment of the present application is in sliding connection with the friction ring 141 during movement in the first direction relative to the caliper housing 11, rather than in sliding connection with the inner wall of the accommodating cavity 111. The length of the contact portion of the friction ring 141 with the ball nut 131 in the first direction is, for example, W1, and the length of the accommodating cavity 111 is, for example, W2. The length W1 of the contact portion of the friction ring 141 with the ball nut 131 is less than the length W2 of the accommodating cavity 111. Exemplarily, the first direction is perpendicular to the second direction Y.

[0090] It should be noted that the length W1 of the contact portion of the friction ring 141 with the ball nut 131 being less than the length W2 of the accommodating cavity 111 according to the embodiment of the present application means that, when the length of the ball nut 131 is greater than or equal to the length W2 of the accommodating cavity 111, assuming that the ball nut 131 is in sliding connection with the accommodating cavity 111, the length of the contact portion of the ball nut 131 with the accommodating cavity 111 is the length W2 of the accommodating cavity 111, and the length W1 of the contact portion of the ball nut 131 with the friction ring 141 is less than the length W2 of the accommodating cavity 111, which indicates that the frictional resistance generated by the ball nut 131 in sliding connection with the friction ring 141 is smaller.

[0091] However, the embodiment of the present application does not limit this, for example, when the length of the ball nut 131 is less than the length W2 of the accommodating cavity 111, assuming that the ball nut 131 is in sliding connection with the accommodating cavity 111, the length of the contact portion of the ball nut 131 with the accommodating cavity 111 is the length of the ball nut 131, at which time the length W1 of the contact portion of the friction ring 141 with the ball nut 131 according to the embodiment of the present application should be limited to be less than the length of the ball nut 131.

[0092] Further, compared with the electrically controlled mechanical caliper in the prior art, on the one hand, the embodiment of the present application increases the mechanical efficiency of the electromechanical brake device 0 under large clamping force by using a small-size friction ring 141. On the other hand, the utility model simplifies the mechanical structure of the caliper assembly 1, and ensures the consistency of the mechanical efficiency of the caliper assembly 1 when mass-produced.

[0093] Exemplarily, as shown in Figure 2 and Figure 3 The accommodating cavity 111 of the embodiment of the present application further has a limiting groove 1111, and the outer wall of the ball nut 131 is provided with a rotation-stopping boss 1311 corresponding to the limiting groove 1111. The rotation-stopping boss 1311 is protruded on the outer wall of the ball nut 131, and the limiting groove 1111 extends in the first direction. When the ball nut 131 is installed in the accommodating cavity 111, the rotation-stopping boss 1311 is configured to be accommodated in the limiting groove 1111, and the two cooperate with each other to limit the ball nut 131 from moving in the third direction (i.e., the circumferential direction of the accommodating cavity 111, for example, the direction perpendicular to the second direction Y) relative to the accommodating cavity 111. Figure 2The Z direction) rotates, and the limiting groove 1111 is also used to guide the rotation stop boss 1311, so that the ball nut 131 can move relative to the limiting groove 1111 in the first direction.

[0094] And it can be understood that the rotation stop boss 1311 of the ball nut 131 can move in the limiting groove 1111, that is, the length of the limiting groove 1111 limits the travel of the ball nut 131 in the first direction, so that the limiting groove 1111 can also be used to prevent the ball nut 131 from moving out of the accommodating cavity 111 in the first direction, affecting the normal use of the caliper assembly 1.

[0095] Exemplarily, the number of the rotation stop boss 1311 and the limiting groove 1111 is not specifically limited in the utility model embodiment, Figure 2 And Figure 3 One rotation stop boss 1311 and one limiting groove 1111 corresponding thereto are shown in the utility model embodiment, but are not limited thereto, for example, the number of the rotation stop boss 1311 and the limiting groove 1111 of the utility model embodiment can also be two, three, four, five, six or more.

[0096] Continuing to refer to Figure 2 And Figure 3 The utility model embodiment extends along the third direction, the friction ring 141 is accommodated in the accommodating cavity 111, is located on the side of the accommodating cavity 111 close to the friction plate 121 and is arranged on the side wall of the accommodating cavity 111, and the friction ring 141 has a first through hole penetrating along the first direction.

[0097] And, as Figure 4 The utility model embodiment further comprises an opening 113 extending along the first direction, and the opening 113 is in communication with the accommodating cavity 111. Exemplarily, the third direction surrounds the first direction. Exemplarily, along the first direction, the length of the friction bushing 142 of the utility model embodiment is, for example, W3, and the length W3 of the friction bushing 142 is less than the length W2 of the accommodating cavity 111.

[0098] Exemplarily, as Figure 4As shown, the outer wall of the friction bushing 142 is provided with a protrusion 1421, which is arranged at one end of the outer wall of the friction bushing 142 away from the accommodating cavity 111 along the first direction, and the hole wall of the opening 113 is provided with a recess corresponding to the protrusion 1421. The protrusion 1421 is arranged on the outer wall of the friction bushing 142 and extends along the third direction, and the protrusion 1421 is accommodated in the recess and abuts against the recess to limit the movement of the friction bushing 142 relative to the opening 113 along the first direction, so as to fix the friction bushing 142 on the caliper shell 11.

[0099] Therefore, along the first direction, one end of the ball nut 131 of the utility model embodiment passes through the first through hole and is in sliding connection with the friction ring 141, and the other end of the ball nut 131 passes through the second through hole and is in sliding connection with the friction bushing 142. And along the second direction, the friction ring 141 is located between one end of the ball nut 131 and the accommodating cavity 111, and the friction bushing 142 is located between the other end of the rod body segment 1322 and the opening 113.

[0100] The utility model embodiment realizes the centering and supporting of the rod body segment 1322 and the ball nut 131 by using the small-size friction ring 141 and the friction bushing 142 to be in sliding connection with the rod body segment 1322 and the ball nut 131 respectively. Compared with the electric control mechanical caliper in the prior art, the contact area between the friction ring 141 and the friction bushing 142 and the rod body segment 1322 and the ball nut 131 is small, the friction resistance generated is small, the influence on the mechanical efficiency of the movement of the rod body segment 1322 and the ball nut 131 along the first direction is small, and the mechanical efficiency of the clamping process of the electronic mechanical brake device 0 is increased.

[0101] Exemplarily, the materials of the friction ring 141 and the friction bushing 142 of the utility model embodiment include copper, plastic or composite materials and other low-friction coefficient manufacturing materials. Furthermore, the utility model embodiment further reduces the friction resistance suffered by the rod body segment 1322 and the ball nut 131 when moving relative to the caliper shell 11 by using the friction ring 141 and the friction bushing 142 prepared from the low-friction coefficient materials, and further improves the mechanical efficiency of the clamping process of the electronic mechanical brake device 0. The low-friction coefficient manufacturing materials mentioned in the utility model embodiment refer to manufacturing materials with a friction coefficient of 0.04 to 0.2, for example, 0.04, 0.08, 0.1, 0.15, 0.2 and the like.

[0102] As shown, Figure 3 The electronic mechanical brake device 0 of the utility model further comprises a dust cover 17.

[0103] Specifically, the dust cover 17 is arranged around the accommodating cavity 111 along the third direction, and is connected to the caliper shell 11 along the second direction, and is sleeved on the ball nut 131. The ball nut 131 is provided with a fixing groove, and the dust cover 17 is accommodated in the fixing groove and is fixedly connected with the ball nut 131, so that the dust cover 17 can follow the ball nut 131 to extend and retract relative to the caliper shell 11 along the first direction, and plays a sealing and dustproof role. However, the structure of the dust cover 17 is not limited in the embodiment of the utility model, as long as the ball nut 131 and the caliper shell 11 can be connected to play a sealing and dustproof role.

[0104] In addition, the sealing ring 102 is arranged between the caliper assembly 1 and the gear box assembly 2, and the caliper assembly 1 and the gear box assembly 2 are tightly connected through the sealing ring 102, so as to ensure the stability of the connection and reduce mechanical wear.

[0105] In some other possible embodiments of the utility model, as shown in Figure 5 The outer edge of the support plate 234 is provided with an extension part 2342, and the extension part 2342 is fixed to the gear box 21 by riveting. Through riveting, the support plate 234 can be firmly fixed in the gear box 21, ensuring the stability of the connection between the two and not easy to loosen, so as to ensure the stability of the gear transmission mechanism 23.

[0106] In some other possible embodiments of the utility model, as shown in Figure 7 The support plate 234 is welded to the gear box 21, and the support plate 234 and the gear box 21 are designed as an integrated structure (the support plate 234 becomes part of the shell of the gear box 21), so that the support plate 234 can effectively share the force and torque inside the gear box 21, thereby enhancing the structural strength and rigidity of the entire gear box 21.

[0107] Further, as shown in Figure 5 And Figure 6As shown in the above embodiments, one end of the motor 22 is provided with an output shaft 221 extending into the gear box 21, and a first gear 222 is fixed on the output shaft 221. A primary transmission gear assembly 231 includes coaxially arranged second and third gears 2311 and 2312. The first gear 222 is engaged with the third gear 2312, and the second gear 2311 is engaged with a fourth gear 2321. The third gear 2312 is arranged at the lower end surface of the second gear 2311, and a support plate 234 is arranged beside the third gear 2312. It should be noted that a motor accommodating cavity can be specially arranged in the gear box 21 to accommodate the motor 22, so that the motor 22 is integrated or assembled inside the gear box 21. In addition, the motor accommodating cavity can also not be arranged, and only the output shaft 221 of the motor 22 extends into the gear box 21. Specifically, the working principle of the electronic mechanical brake device 0 is as follows: the motor 22 drives the first gear 222 to rotate, the first gear 222 drives the third gear 2312 to rotate through engagement, the third gear 2312 drives the coaxially arranged second gear 2311 to rotate, the second gear 2311 drives the fourth gear 2321 to rotate through engagement, the fourth gear 2321 drives the sun gear 2322 to rotate, the sun gear 2322 drives the planetary gear 2331 to rotate through engagement, the planetary gear 2331 rotates around the outer ring gear 240 through engagement to drive the planetary gear carrier 2333 to rotate, the planetary gear carrier 2333 drives the output spline 2332 to rotate, the output spline 2332 outputs driving force to the ball screw 13, and then the ball screw 13 rotates to drive the ball 130 to roll, so as to drive the ball nut 131 to move in the first direction, so as to drive the brake part 12 to move in the first direction towards the brake disc (not shown in the figure) of the wheel, so as to clamp the brake disc to achieve the brake of the vehicle.

[0108] Therefore, the first gear 222 is engaged with the third gear 2312, the second gear 2311 is engaged with the fourth gear 2321, the third gear 2312 is arranged at the lower end surface of the second gear 2311, and the support plate 234 is arranged beside the third gear 2312. According to the arrangement mode of the gear transmission mechanism 23, the support plate 234 is additionally arranged between the fourth gear 2321 and the sun gear 2322, the axial gap between the fourth gear 2321 and the sun gear 2322 is effectively utilized, the increase of the axial dimension is avoided, stable support force is provided for the fourth gear 2321, and the installation precision, stability and service life of the gear transmission mechanism 23 are improved.

[0109] In some possible embodiments of the utility model, continuing to refer to Figure 5As shown, the gear transmission mechanism 23 further comprises a motor magnet 239 for generating a magnetic field, which, in cooperation with a Hall sensor, a magneto-electric sensor or other magnetic sensor, can detect the rotating speed and position of the motor 22, thereby monitoring the operating state of the motor. The motor magnet 239 is butted against the first gear 222 in the first direction (i.e. the axial direction, for example Figure 5 As shown, the gear transmission mechanism 23 further comprises a motor magnet 239 for generating a magnetic field, which, in cooperation with a Hall sensor, a magneto-electric sensor or other magnetic sensor, can detect the rotating speed and position of the motor 22, thereby monitoring the operating state of the motor. The motor magnet 239 is butted against the first gear 222 in the first direction (i.e. the axial direction, for example Figure 5 As shown, the first gear 222 is engaged with the third gear 2312, the second gear 2311 is engaged with the fourth gear 2321, the third gear 2312 is arranged at the lower end surface of the second gear 2311, the support plate 234 is arranged beside the third gear 2312, the first gear 222 is sleeved on the output shaft 221, and the motor magnet 239 is fixed at one end of the output shaft 221. In this way, the space above the first gear 222 can be used to arrange the motor magnet 239, and this arrangement will not increase the size of the gear transmission assembly 23 in the first direction. Compared with the prior art in which the first gear 222 is engaged with the second gear 2311, the third gear 2312 is arranged at the lower end surface of the second gear 2311, the third gear 2312 is engaged with the fourth gear 2321, and then the motor magnet 239 is arranged on the first gear 222, the above arrangement provided by the utility model utilizes the space above the first gear 222, thereby effectively reducing the axial size of the gear transmission mechanism 23.

[0110] Continuing to refer to Figure 5 , Figure 6 and Figure 7 As shown, in the utility model embodiment, one end of the support plate 234 close to the third gear 2312 is provided with a let-out gap 2341, the let-out gap 2341 lets out the third gear 2312, so that the third gear 2312 can rotate. The existence of the let-out gap 2341 avoids the direct contact between the support plate 234 and the third gear 2312, reduces the interference that can occur during the operation of the two, thereby improving the stability and service life of the support plate 234, and also ensures that the third gear 2312 has enough space to rotate near the support plate 234 and will not be hindered from normal operation due to the existence of the support plate 234.

[0111] In some other possible embodiments of the utility model, the primary transmission gear assembly 231 further comprises a first pin shaft 231102 penetrating the second gear 2311 and the third gear 2312, the gear box 21 is provided with a positioning pin hole 245, the positioning pin hole 245 is used for cooperating with the first pin shaft 231102 to press fit the primary transmission gear assembly 231 in the gear box 21. By cooperating the first pin shaft 231102 with the positioning pin hole 245 in the gear box 21, the primary transmission gear assembly 231 can be accurately positioned in the gear box 21, thereby improving the installation precision and transmission efficiency of the gear transmission mechanism 23.

[0112] In some other possible embodiments of the utility model, the planetary gear transmission assembly 233 further comprises a planetary gear carrier 2333, a plurality of planetary gears 2331 are assembled on the first end face of the planetary gear carrier 2333, and the output spline 2332 is assembled on the second end face of the planetary gear carrier 2333, the first end face and the second end face are two faces of the planetary gear carrier 2333 oppositely arranged along the first direction. Among them, the central position of the upper end face of the sun gear 2322 is provided with a first positioning part 235 cooperating with the fourth gear 2321, the central position of the lower end face of the sun gear 2322 is provided with a second positioning part (not shown) cooperating with the planetary gear carrier 2333, and the sun gear 2322 is positioned between the fourth gear 2321 and the planetary gear carrier 2333 through the first positioning part 235 and the second positioning part. By thus setting, the accurate positioning of the sun gear 2322 between the fourth gear 2321 and the planetary gear carrier 2333 can be ensured, and the installation precision and stability of the gear transmission mechanism 23 are improved.

[0113] Specifically, the planetary gear carrier 2333 is a circular table structure. The number of planetary gears 2331 is not specifically limited in the utility model. For example, in the embodiment, the planetary gear transmission assembly 233 comprises three planetary gears 2331, and the first end face of the planetary gear carrier 2333 is uniformly provided with three planetary gear shafts, and the three planetary gears 2331 are assembled in one-to-one correspondence with the three planetary gear shafts, so that the three planetary gears 2331 are rotatably assembled on the first end face of the planetary gear carrier 2333.

[0114] Further, the planetary gear transmission assembly 233 further comprises a sun gear positioning shaft (not shown) provided in the planetary gear carrier 2333 and used for assembling with the sun gear 2322, for example, assembling with the second positioning part of the sun gear 2322. The sun gear positioning shaft is located at the central position of the planetary gear carrier 2333 and is located on the same side as the plurality of planetary gears 2331. Thus, the accurate positioning of the sun gear 2322 can be realized.

[0115] For example, the second positioning part may be an annular column, with a corresponding positioning slot on the planetary gear carrier 2333; or, the second positioning part may be a positioning slot, with a corresponding annular column on the planetary gear carrier 2333. The annular column is inserted into the positioning slot to position one end of the sun gear 2322 on the planetary gear carrier 2333. By inserting the annular column into the positioning slot, the movement of the sun gear 2322 in the first direction can be effectively restricted, preventing axial movement and ensuring that the sun gear 2322 is positioned at the designated position on the planetary gear carrier 2333. Furthermore, the above positioning method simplifies the assembly process and improves assembly efficiency.

[0116] In other possible embodiments of this utility model, reference continues. Figure 5 As shown, a second bearing 237 is provided on the outer periphery of the planetary gear carrier 2333, and the planetary gear carrier 2333 is positioned within the gearbox 21 by means of the second bearing 237. On the one hand, by using the second bearing 237, the direct contact between the planetary gear carrier 2333 and the inner wall of the gearbox 21 can be reduced, thereby reducing wear and extending the service life of the gear transmission mechanism 23 and the gearbox 21. On the other hand, the second bearing 237 can provide support for the planetary gear carrier 2333, enabling it to rotate stably within the gearbox 21, while fixing it in the correct position and preventing unnecessary axial or radial movement. Exemplarily, the second bearing 237 is a rolling bearing or a sliding bushing. Alternatively, a bushing 243 (e.g., ...) is provided on the outer periphery of the planetary gear carrier 2333. Figure 7 As shown, the planetary gear carrier 2333 is positioned within the gearbox 21 by a bushing 243. On one hand, the bushing 243 ensures the predetermined position of the planetary gear carrier 2333 within the gearbox, preventing axial or radial movement during operation, thereby ensuring the accuracy of the installed gear transmission mechanism 23. On the other hand, the bushing 243 also reduces direct contact between the planetary gear carrier 2333 and the inner wall of the gearbox 21, reducing wear and extending the service life of the gearbox 21. Specifically, as... Figure 5 and Figure 7As shown, the outer periphery of the planet carrier 2333 is provided with a second bearing 237, and the outer periphery of the second bearing 237 is provided with a bushing 243, and the planet carrier 2333 is positioned in the gear box 21 through the bushing 243. Where the support plate 234 is fixed in the gear box 21 by welding (the support plate 234 is integrated with the gear box 21), since the planet carrier 2333 needs to be installed in the gear box 21 from bottom to top along the first direction, the bushing 243 can be designed as an integral structure with the gear box 21 shell, which can effectively fix and support the second bearing 237, so as to ensure the predetermined position of the planet carrier 2333 in the gear box 21. When the support plate 234 is fixed in the gear box 21 by riveting, the planet carrier 2333 needs to be installed in the gear box 21 from top to bottom along the first direction, at this time, the bushing 243 is not needed to be set, and the planet carrier 2333 can be fixed in the gear box 21 through the second bearing 237.

[0117] Further, the outer periphery of the planet carrier 2333 is provided with a second bearing 237, and the outer periphery of the second bearing 237 is provided with a bushing 243, and the outer periphery of the bushing 243 is sleeved with a snap ring 244 (for example Figure 7 As shown, the inner wall of the gear box 21 is provided with a clamping groove 211 (for example Figure 8 The snap ring 244 fixes the planet carrier 2333 in the gear box 21 by cooperating with the clamping groove 211. Specifically, for example, the clamping groove 211 can be a groove, when the snap ring 244 is pressed into the groove and reaches the correct position, the radial pressure it receives will make it tightly adhere to the side wall of the groove, so as to stably fix the bushing 243 and the planet carrier 2333 in the predetermined position in the gear box 21. The clamping groove 211 can also be an annular step (for example Figure 8When the snap ring 244 is pressed into the mesa of the annular step, it will generate a restoring force due to elastic deformation, which will make the snap ring 244 tightly adhere to the mesa, so as to stably fix the planetary gear carrier 2333 at a predetermined position in the gear box 21, thereby further improving the installation accuracy and avoiding noise during operation of the gear transmission mechanism 23. When the support plate 234 is fixed in the gear box 21 by welding (the support plate 234 and the gear box 21 are integrated), since the planetary gear carrier 2333 needs to be installed in the gear box 21 from bottom to top along the first direction, in order to realize the fixation and support of the second bearing 237 and ensure the predetermined position of the planetary gear carrier 2333 in the gear box 21, the snap ring 244 can be arranged on the outer periphery of the bushing 243, and the planetary gear carrier 2333 can be stably fixed in the gear box 21 by cooperation of the snap ring 244 and the clamping groove 211. When the support plate 234 is fixed in the gear box 21 by riveting, the planetary gear carrier 2333 needs to be installed in the gear box 21 from top to bottom along the first direction, and at this time, the snap ring 244 is not needed, and the planetary gear carrier 2333 can be fixed in the gear box 21 by the second bearing 237.

[0118] In some possible embodiments of the utility model, the bottom of the planetary gear carrier 2333 is provided with an extension cavity, the output spline 2332 comprises an engagement area and an extension area, the engagement area is embedded in the extension cavity, and the extension area extends from the extension cavity and outputs driving force to the ball screw 132 by cooperating with the inner spline 13221. The extension cavity can improve the strength of the planetary gear carrier 2333 and the connection strength of the output spline 2332, and help to more evenly distribute the load on the planetary gear carrier 2333, thereby reducing stress concentration around the engagement area and prolonging the service life of the output spline 2332 and the planetary gear carrier 2333. The extension cavity can be embedded in the planetary gear carrier 2333 or not. In particular, the extension cavity is embedded in the planetary gear carrier 2333, thereby increasing the contact area between the engagement area and the planetary gear carrier 2333, improving the strength and stability of the connection, and further ensuring the braking effect.

[0119] Further, in the above embodiment, the output spline 2332 includes an extension area that extends from the bottom of the planetary gear carrier 2333 and engages with the inner spline 13221 to output driving force to the ball screw 132. This invention stably fixes the planetary gear carrier 2333 within the gearbox 21, thereby reducing stress. Therefore, there is no need to provide an extension cavity to distribute stress; the extension area can directly engage with the inner spline 13221 to output driving force to the ball screw 132. This also reduces the engagement height between the caliper assembly 1 and the gearbox assembly 2, thereby reducing the axial dimension of the electromechanical braking device 0. The extension area may be embedded in the bottom of the planetary gear carrier 2333 or not (the extension area is integrally formed with the planetary gear carrier). Specifically, for example, embedding the extension area in the bottom of the planetary gear carrier 2333 improves installation stability and ensures braking performance.

[0120] refer to Figure 5 and Figure 8 As shown, the planetary gear carrier 2333 has a cantilever structure, and the inner wall of the gearbox 21 is provided with a groove 211 that mates with the cantilever structure, thus facilitating the accurate positioning of the planetary gear carrier 2333 within the gearbox 21. Specifically, the gearbox 21 has a groove 211 in the area corresponding to the secondary transmission gear assembly 232, meaning the secondary transmission gear assembly 232 is positioned above the groove 211, and the external gear ring 240 is press-fitted into the groove 211, thereby fixing the external gear ring 240 within the gearbox 21. The external gear ring 240 has a mounting portion, and the groove 211 has a mating portion. The mounting portion and the mating portion are fitted together to press the external gear ring 240 into the gearbox 21. To ensure the stability of the external gear ring 240 and prevent twisting during transmission, there are at least two mounting portions, and the number of mating portions is the same as the number of mounting portions and corresponds one-to-one with the mounting portions. For example, there are six mounting portions, evenly distributed around the outer periphery of the external gear ring 240.

[0121] Specifically, the mounting part is an anti-rotation boss 2401 provided on the external gear ring 240. The anti-rotation boss 2401 extends from the press-fit surface of the external gear ring 240, which is one end face in the direction of the central axis of the external gear ring 240. The mating part is a positioning hole on the surface of the slot 211. After the external gear ring 240 is assembled, the press-fit surface fits into the slot 211. In addition, the other end face of the external gear ring 240 opposite to the press-fit surface is a reference surface for linear press-fitting. The external gear ring 240 and the gearbox 21 are assembled as a whole by interference fit to ensure the stability of the external gear ring 240.

[0122] In the embodiment, a limiting hole 2343 is arranged at the center of the upper end surface of the support plate 234, a third positioning part 236 is arranged at the center of the lower end surface of the fourth gear 2321, a third bearing 238 is arranged around the third positioning part 236, and the fourth gear 2321 is fixed to the support plate 234 by embedding the third bearing 238 into the limiting hole 2343. The cooperation between the limiting hole 2343 and the third positioning part 236 ensures the accurate positioning of the fourth gear 2321 on the support plate 234, reduces the deviation of the gear during operation, and improves the installation accuracy and transmission efficiency. The third bearing 238 not only enables the gear to remain stable during rotation and prevents it from moving due to external force, but also reduces the direct contact between the fourth gear 2321 and the support plate 234, thereby reducing friction and wear and prolonging the service life of the fourth gear 2321 and the support plate 234.

[0123] Exemplarily, the material of the support plate 234 is metal or powder metallurgy. Metal or powder metallurgy generally has high mechanical strength and rigidity and can withstand large forces and torques. The use of a support plate 234 made of metal or powder metallurgy to position the fourth gear 2321 can effectively provide stable support force for the fourth gear 2321.

[0124] Exemplarily, the material of the gear box 21 is metal or plastic. When plastic material is selected, the cost of the gear box 21 can be reduced, but the transmission efficiency is not as good as that of a metal gear box 21. Preferably, the gear box 21 of the utility model is made of metal material, which has higher strength and rigidity than a plastic gear box. The utility model integrates the gear transmission mechanism 23 entirely into the gear box 21 and uses metal material, so that the gear box 21 can provide sufficient support strength to fix the gear transmission mechanism 23. Thus, not only the installation accuracy and consistency are improved, but also excessive vibration and noise generated by the gear during high-speed operation are avoided, thereby significantly improving the service life and transmission efficiency of the gear transmission mechanism 23.

[0125] In some other possible embodiments of the utility model, in combination with Figure 8 As shown in the figure, the controller assembly 3 abuts against the gear box 21 along the first direction and is used to seal the gear box 21. The controller assembly 3 is further provided with a controller on one side along the second direction, so that information sent by various sensors (such as the force sensor 18) can be received in real time, for example, the braking degree, etc. After processing, various parameters are sent to the related actuator to perform various predetermined control functions, which facilitates the timely elimination of potential faults.

[0126] Further, in combination with Figure 5 and Figure 8As shown, the gear box 21 is further provided with a force sensor connector passage 212, and in the assembly process, only the force sensor connector 241 needs to be inserted into the force sensor connector passage 212, and then the cover plate 242 is covered on the gear box 21, so that the force sensor connector 241 can be stably installed in the gear box 21. Thus, the force sensor connector 241 and the force sensor 18 are connected, and the information detected by the force sensor 18 can be transmitted to the controller through the force sensor connector 241 in time, so as to monitor the working state of the caliper assembly 1.

[0127] In a second aspect, the embodiments of the utility model discloses a kind of vehicles, including electronic mechanical brake device 0 as in any one of the first aspect, gear box assembly 2 can drive brake part 12 movement along the first direction, to brake vehicle.

[0128] By the above technical scheme, the electronic mechanical brake device 0 is compact along the axial dimension, is convenient to arrange, avoids interference with other components, and improves driving safety and braking stability.

[0129] Although the utility model has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood that the above description is further detailed explanation 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 derivations or substitutions, without departing from the spirit and scope of the utility model.

Claims

1. An electromechanical brake device characterized by comprising: The caliper assembly and the gear box assembly are connected along a first direction, and the gear box assembly is used to drive the caliper assembly to brake, The caliper assembly comprises: A ball screw comprising a threaded segment and a rod segment distributed along the first direction, and the rod segment is provided with an inner spline at one end; A thrust bearing is sleeved on the outer periphery of the rod segment; A gasket is sleeved on the outer periphery of the rod segment; A ball nut is sleeved on the outer periphery of the threaded segment, the thrust bearing and the gasket, and the length of the threaded segment along the first direction is less than the length of the ball nut; A brake is located at one end of the ball nut away from the rod segment; Through the rotation of the ball screw, the ball nut is driven to move along the first direction to push the brake to move along the first direction to brake; The gear box assembly comprises: 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, used to output driving force to drive the caliper assembly, comprising: 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, comprising a fourth gear and a sun gear coaxially arranged, and the fourth gear can drive the sun gear to rotate; A planetary gear transmission assembly comprising a plurality of planet gears and an output spline, the sun gear is located at the center of the plurality of planet gears and is in mesh with the plurality of planet gears respectively, and the output spline is connected with the inner spline for outputting driving force to the ball screw; A support plate located between the fourth gear and the sun gear along the first direction and fixedly connected with the gear box, used to support the fourth gear.

2. The electromechanical brake apparatus of claim 1, wherein The outer periphery of the threaded segment is provided with a plurality of independent circulation loops distributed along the first direction, and the circulation loops are provided with balls, so that the ball screw can drive the ball nut to move along the first direction.

3. The electromechanical brake apparatus of claim 2, wherein The caliper assembly further comprises: A caliper shell having a receiving cavity extending along the first direction, and the ball nut is received in the receiving cavity; A first friction part provided on the side wall of the receiving cavity along the first direction, the ball nut passes through the first friction part and is in sliding connection with the first friction part, the first friction part is located between the receiving cavity and the ball nut along a second direction to make the ball nut spaced apart from the side wall of the receiving cavity, and the second direction is perpendicular to the first direction; Wherein, along the first direction, the length of the contact part of the first friction part with the receiving cavity is less than the length of the receiving cavity.

4. The electromechanical brake device of claim 3, wherein The first friction part comprises a friction ring arranged on the side of the receiving cavity close to the brake and extending along a third direction; The friction ring has a first through hole penetrating through the first friction part along the first direction, the ball nut passes through the first through hole and is in sliding connection with the friction ring, and the third direction surrounds the first direction; Along the first direction, the length of the friction ring is less than the length of the receiving cavity.

5. The electromechanical brake device of claim 3, wherein The caliper shell is provided with an opening, the opening is communicated with the accommodating cavity, the rod body segment is connected with the gear box assembly through the opening along the first direction; The caliper assembly further comprises a second friction part, the second friction part is arranged on the hole wall of the opening, has a second through hole penetrating through the second friction part along the first direction, the rod body segment penetrates through the second through hole and is in sliding connection with the second friction part, and the second friction part is located between the rod body segment and the hole wall of the opening along the second direction.

6. The electromechanical brake device of claim 5, wherein The second friction part comprises a friction bushing, the friction bushing is arranged on the hole wall of the opening and extends along a third direction, and the rod body segment penetrates through the friction bushing and is in sliding connection with the friction bushing.

7. The electromechanical brake device of claim 6, wherein An outer wall of the friction bushing has a convex part, the convex part is arranged on an end of the outer wall of the friction bushing away from the accommodating cavity along the first direction, a hole wall of the opening has a concave part corresponding to the convex part, the convex part is accommodated in the concave part and abuts against the concave part, so as to limit movement of the friction bushing relative to the opening along the first direction.

8. The electromechanical brake apparatus of claim 4, wherein, The side wall of the accommodating cavity further comprises a limiting groove extending along the first direction, and an outer wall of the ball nut comprises a rotation-stopping boss corresponding to the limiting groove, the rotation-stopping boss is arranged on the outer wall of the ball nut; The rotation-stopping boss is configured to be accommodated in the limiting groove, so as to limit rotation of the ball nut relative to the accommodating cavity along the third direction and enable movement of the ball nut relative to the limiting groove along the first direction.

9. The brake device of claim 4, wherein The caliper assembly further comprises a dust cover, the outer wall of the ball nut is provided with a fixing groove, an outer side end of the dust cover is connected to the caliper shell along the second direction, and an inner side end of the dust cover is sleeved on the outer wall of the ball nut and accommodated in the fixing groove, so that the inner side end of the dust cover can follow the ball nut to stretch and contract relative to the caliper shell along the first direction.

10. The electromechanical brake apparatus of claim 1, wherein, An outer edge of the support plate is provided with a protruding part, and the protruding part is riveted to the gear box; or the support plate is welded to the gear box.

11. The electromechanical brake apparatus of claim 1, wherein, 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 coaxially arranged second and third gears, the first gear is engaged with the third gear, the second gear is engaged with the fourth gear, the third gear is arranged on a lower end face of the second gear, and the support plate is arranged beside the third gear.

12. The electromechanical brake device of claim 11, wherein, The gear transmission mechanism further comprises a motor magnet, the motor magnet is axially butted against the first gear and located above the first gear.

13. The electromechanical brake apparatus of claim 11, wherein, One end of the support plate close to the third gear is provided with a clearance gap, the clearance gap gives way to the third gear, so that the third gear can rotate.

14. The electromechanical brake device of claim 11, wherein, The primary transmission gear assembly further comprises a first pin shaft penetrating through the second and third gears, and the gear box is provided with a positioning pin hole, the positioning pin hole is used to cooperate with the first pin shaft to press-fit the primary transmission gear assembly in the gear box.

15. The electromechanical brake apparatus of claim 14, wherein, The second gear, the third gear and the first pin shaft are in sliding fit, or a first bearing is arranged between the second gear, the third gear and the first pin shaft.

16. The electromechanical brake apparatus of claim 1, wherein, The planetary gear transmission assembly further comprises a planet carrier, the plurality of planet gears are assembled on a first end face of the planet carrier, and the output spline is assembled on a second end face of the planet carrier, the first end face and the second end face being opposite faces of the planet carrier. A first positioning part cooperating with the fourth gear is arranged at a central position of an upper end face of the sun gear, and a second positioning part cooperating with the planet carrier is arranged at a central position of a lower end face of the sun gear, the sun gear being positioned between the fourth gear and the planet carrier through the first positioning part and the second positioning part.

17. The electromechanical brake apparatus of claim 16, wherein, 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 a positioning slot hole, and an annular column is correspondingly arranged on the planet carrier, the annular column being inserted into the positioning slot hole to position one end of the sun gear on the planet carrier.

18. The electromechanical brake apparatus of claim 16, wherein, A second bearing or a bushing is arranged on an outer periphery of the planet carrier, or a second bearing is arranged on an outer periphery of the planet carrier, and a bushing is arranged on an outer periphery of the second bearing, the planet carrier being positioned in the gear box through the second bearing or the bushing.

19. The electromechanical brake apparatus of claim 18, wherein, 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, an inner wall of the gear box is provided with a clamping groove, and the snap ring is clamped to the clamping groove to fix the planet carrier in the gear box.

20. The electromechanical brake apparatus of claim 16, wherein, An output spline comprises an engaging area and an extending area, the engaging area is embedded in the extending cavity, and the extending area extends from the extending cavity and cooperates with the internal spline to output the driving force to the ball screw.

21. The electromechanical brake apparatus of claim 16, wherein, An output spline comprises an extending area, the extending area extends from the bottom of the planet carrier and cooperates with the internal spline to output the driving force to the ball screw.

22. The electromechanical brake apparatus of claim 1, wherein, A limiting hole is arranged at a central position of an upper end face of the support plate, a third positioning part is arranged at a central position of a lower end face 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.

23. A vehicle characterized by comprising: The gear box assembly can drive the brake part to move in the first direction to brake the vehicle.

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