Electronic mechanical braking device for drive-by-wire chassis

Abstract

The utility model provides an electronic mechanical braking device for a drive-by-wire chassis, and belongs to the technical field of vehicle braking. The electronic mechanical braking device comprises a braking caliper body assembly, a braking transmission assembly, a driving motor connecting assembly and a driving motor. The brake caliper body is a core part of the brake caliper body assembly, an arc-shaped face and a limiting face are arranged in the brake caliper body, and a driving motor connector is arranged at the tail of the brake caliper body. The brake transmission assembly comprises a nut piston sealing cover, a nut piston and a ball screw. The nut piston is provided with an arc-shaped surface, a limiting surface and a sealing groove; the driving motor connecting assembly comprises a spline groove flange plate and a driving motor fixing frame. The electronic mechanical braking device adopts a caliper body integrated configuration scheme, and has the advantages of compact structure, smooth transmission, quick response, high bearing capacity and the like. Meanwhile, the electronic mechanical braking device can adapt to driving motors of different specifications by adjusting the driving motor fixing frame and the spline groove flange plate, and the application scene of the electronic mechanical braking device is expanded.

Description

Technical Field

[0001] This application relates to the field of vehicle braking technology, and more particularly to an electromechanical braking device for drive-by-wire chassis. Background Technology

[0002] Electromechanical braking (EMB) is a new type of brake-by-wire technology that uses a motor connected to a mechanical transmission mechanism to directly drive the brakes to achieve vehicle braking. Compared to traditional hydraulic braking systems, EMB systems completely eliminate components such as brake fluid and hydraulic lines.

[0003] Existing electromechanical braking devices often employ complex structural solutions. A typical structure is disclosed in Chinese patent document application number 202321525631.6. This electromechanical braking actuator has numerous components, cumbersome assembly processes, and high production costs, hindering large-scale promotion. Furthermore, existing electromechanical braking devices, such as those disclosed in Chinese patent document application number 202410591391.2, have thin limiting boss structures. Especially in high-load-bearing applications, these structures are prone to high stress concentration, leading to increased system friction, reduced braking efficiency, poor response linearity, and difficulty in meeting the requirements for stable and durable braking. Summary of the Invention

[0004] The purpose of this application is to address the problems existing in the prior art by proposing a compact integrated electromechanical braking configuration scheme. The transmission component limiting mechanism is reasonably designed, and in high load-bearing applications, the system transmission is smooth and the response is rapid. The transmission component has high axial stiffness and good braking loading linearity. At the same time, this application embodiment can be adapted to various specifications of drive motors to meet different braking clamping force scenarios and assembly space requirements.

[0005] To achieve the above objectives, the basic technical solution of the electromechanical braking device of this utility model is as follows: it includes a brake caliper body assembly, a brake transmission assembly, a drive motor connection assembly, and a drive motor; the brake caliper body assembly includes a first friction plate, a second friction plate, a brake caliper body fixing frame, a first guide pin, a second guide pin, a first dust cover, a second dust cover, a first guide pin bolt, a second guide pin bolt, and a brake caliper body; the brake transmission assembly includes a nut piston cover, a nut piston, a ball screw, and a flat thrust bearing; the drive motor connection assembly includes a spline flange and a drive motor fixing frame.

[0006] A further improvement of this utility model is that the brake caliper body contains two regions: an arc-shaped surface and a limiting surface. The cross-section of the limiting surface region adopts a symmetrical crescent shape on both sides. A bearing groove is provided on the inner side of the tail of the brake caliper body, and a drive motor interface is provided on the outer side of the tail.

[0007] A further improvement of this utility model is that the nut piston cover includes a bearing section and a connecting section, wherein the connecting section is provided with a sealing groove; the nut piston includes two regions: an arc-shaped surface and a limiting surface, the arc-shaped surface region is provided with a sealing groove, and the limiting surface region has a rounded rectangular cross-section; the ball screw includes a retaining spring groove and a tail spline; the nut piston and the ball screw are driven by internal ball meshing.

[0008] A further improvement of this utility model is that the planar thrust bearing is assembled in the bearing groove on the inner side of the tail of the brake caliper body, the ball screw is in axial contact with the planar thrust bearing, and the spline at the tail of the ball screw passes through the brake caliper body and engages with the splined flange for transmission.

[0009] A further improvement of this utility model is that the outer contour of the nut piston is consistent with the inner contour of the brake caliper body, and the nut piston and the brake caliper body adopt a clearance fit; when the ball screw rotates, the limiting surface of the brake caliper body contacts the limiting surface of the nut piston, thereby restricting the circumferential rotation of the nut piston and realizing axial movement.

[0010] By adopting this utility model, the contact area between the brake caliper body and the nut piston limiting surface is increased, which reduces the stress concentration of the brake caliper body and the nut piston during transmission, effectively reduces friction loss, makes the system transmission smoother, responds more quickly, and effectively improves load-bearing capacity and transmission efficiency.

[0011] The present invention is further improved in that the splined flange is a disc with a boss, the inner ring of the boss is provided with a spline groove, and the outer ring of the disc is provided with a fixing hole for the output shaft of the drive motor; the inner ring of the motor mounting bracket is provided with a clamp body fixing threaded hole, and the outer ring is provided with a fixing hole for the drive motor.

[0012] A further improvement of this utility model is that the drive motor can be directly fixed to the brake caliper body through the drive motor interface provided on the outer side of the tail of the brake caliper body, or fixed to the drive motor mounting bracket and then indirectly fixed to the brake caliper body; the drive motor is provided with a brake holder for vehicle parking braking.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. The caliper body adopts an integrated configuration, with a sophisticated overall design and simple transmission components, which facilitates processing and assembly and effectively controls manufacturing costs;

[0015] 2. The transmission components respond quickly and the transmission is smooth. The stress distribution of the limiting mechanism is reasonable, which gives the system good wear resistance and greatly improves the service life of the system.

[0016] 3. The transmission components have high axial stiffness and good linearity of response, and the transmission system has strong load-bearing capacity, which can meet the requirements of large braking loading force;

[0017] 4. By adjusting the fixing holes of the motor mounting bracket and the spline flange, the brake caliper body of this utility model can be adapted to various specifications of drive motors to meet different braking clamping force scenarios and assembly space requirements. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a schematic diagram of the electromechanical braking device assembly provided in the embodiments of this application;

[0020] Figure 2 This is a schematic diagram of the explosion at the front oblique side of the electromechanical braking device provided in the embodiments of this application;

[0021] Figure 3 This is a front cross-sectional schematic diagram of the electromechanical braking device provided in the embodiments of this application;

[0022] Figure 4 A schematic diagram of the nut piston of the electromechanical braking device provided in the embodiments of this application;

[0023] Figure 5 A schematic diagram of the ball screw of the electromechanical braking device provided in the embodiments of this application;

[0024] Figure 6 A schematic diagram of the nut piston cover of the electromechanical braking device provided in the embodiments of this application;

[0025] Figure 7 (a) is a front view of the brake caliper body of the electromechanical braking device provided in the embodiment of this application;

[0026] Figure 7 (b) A schematic cross-sectional view of the brake caliper body of the electromechanical braking device provided in the embodiments of this application;

[0027] Figure 8 A schematic diagram of the splined flange of the electromechanical braking device provided in the embodiments of this application;

[0028] Figure 9 A top cross-sectional view of the electromechanical braking device provided in the embodiments of this application;

[0029] Figure 10 The measured drive motor rotation angle and braking force curves of the electromechanical braking device provided in the embodiments of this application;

[0030] Figure 11Another assembly schematic diagram of the electromechanical braking device provided in the embodiments of this application;

[0031] Figure 12 A schematic diagram of the drive motor mounting bracket for the electromechanical braking device provided in this application embodiment.

[0032] In the diagram: 101, First friction plate; 102, Second friction plate; 2, Brake caliper body mounting bracket; 3, Nut piston cover; 301, Nut piston cover bearing section; 302, Nut piston cover connecting section; 303, Nut piston cover sealing groove; 4, Nut piston; 401, Nut piston arc surface; 402, Nut piston limiting surface; 403, Nut piston sealing groove; 5, Ball screw; 501, Ball screw retaining ring groove; 502, Ball screw tail spline; 6, Planar thrust bearing; 701, First guide pin; 702, Second guide pin; 801, First dust cover; 802, Second dust cover; 901, First guide pin Bolts; 902, Second guide pin bolt; 10, Brake caliper body; 1001, Arc-shaped surface of brake caliper body; 1002, Limiting surface of brake caliper body; 1003, Bearing groove of brake caliper body; 1004, Sealing groove of brake caliper body; 1005, Drive motor interface of brake caliper body; 11, Splined flange; 1101, Splined groove; 1102, Fixing hole of drive motor output shaft; 12, Drive motor; 1201, Drive motor output shaft; 1202, Fixing hole of drive motor; 13, Drive motor mounting bracket; 1301, Inner ring of mounting bracket, caliper body fixing threaded hole; 1302, Outer ring of mounting bracket, drive motor fixing hole. Detailed Implementation

[0033] Example

[0034] The basic structure of an electromechanical braking device for a drive-by-wire chassis according to an embodiment of this application is as follows: Figures 1-3 As shown, the brake caliper body mounting bracket 2 is fixed to the vehicle's bogie. The first friction pad 101 and the second friction pad 102 are respectively placed in the slots on the front and rear sides of the brake caliper body mounting bracket 2, with the vehicle's brake disc positioned between the first friction pad 101 and the second friction pad 102. The first guide pin bolt 901 and the second guide pin bolt 902 pass through the through holes on both sides of the brake caliper body 10 and are fixedly connected to the first guide pin 701 and the second guide pin 702, respectively. The first guide pin 701 and the second guide pin 702 are respectively inserted into the first dust cover 801 and the second dust cover 802.

[0035] See Figure 4 and Figure 5As shown, the nut piston 4 is provided with a nut piston arc-shaped surface 401, a nut piston limiting surface 402, and a nut piston sealing groove 403. The ball screw 5 is provided with a ball screw retaining ring groove 501 and a ball screw tail spline 502. The nut piston 4 and the ball screw 5 are driven by internal ball meshing, and a flat thrust bearing 6 is installed at the tail of the ball screw 5.

[0036] See Figure 6 As shown, the nut piston cover 3 is provided with a nut piston cover bearing section 301, a nut piston cover connecting section 302, and a nut piston cover sealing groove 303. A sealing ring is installed in the nut piston cover sealing groove 303, and the nut piston cover connecting section 302 is installed in the central circular hole of the nut piston 4.

[0037] See Figure 7 As shown, the brake caliper body 10 is provided with a brake caliper body arc surface 1001, a brake caliper body limiting surface 1002, a brake caliper body bearing groove 1003, a brake caliper body drive motor interface 1004, and a brake caliper body sealing groove 1005. The nut piston cover 3, nut piston 4, ball screw 5, and flat thrust bearing 6 are assembled and installed inside the brake caliper body 10. A sealing ring is installed in the nut piston sealing groove 403, the flat thrust bearing 6 is placed in the brake caliper body bearing groove 1003 on the inner side of the tail of the brake caliper body 10, and a retaining ring is installed in the ball screw retaining ring groove 501.

[0038] See Figure 8 As shown, the splined flange 11 is a disc with a boss, and is provided with a splined groove 1101 and a drive motor output shaft fixing hole 1102. The splined flange 11 is fixedly connected to the drive motor output shaft 1201 by bolts through the drive motor output shaft fixing hole 1102 provided on the outer ring of the disc. A sealing ring is installed in the brake caliper body sealing groove 1004. The splined groove 1101 provided on the inner ring of the boss of the splined flange 11 engages with the spline 502 at the tail of the ball screw. The drive motor fixing hole 1202 is fixedly connected to the brake caliper body drive motor interface 1005 by bolts.

[0039] The first guide pin 701 and the second guide pin 702 are then simultaneously inserted into the guide pin holes on both sides of the brake caliper body fixing bracket 2, and the nut piston cover connecting section 302 contacts the second friction plate 102.

[0040] Continue to refer to Figure 4 and Figure 7As shown, the cross-section of the nut piston limiting surface 402 is a rounded rectangle, and the cross-section of the brake caliper body limiting surface 1002 is a symmetrical crescent shape on both sides. The two are identical in shape and use a clearance fit. The nut piston limiting surface 402 and the brake caliper body limiting surface 1002 fit tightly together, with a wide contact area, effectively solving the problem of stress concentration during transmission. The cross-sections of the nut piston arc surface 401 and the brake caliper body arc surface 1001 are both circular, also using a clearance fit. (Refer to...) Figure 9 As shown, the above structural form enables the nut piston 4 to simultaneously satisfy both sealing and limiting functions.

[0041] When braking is applied, the output shaft 1201 of the drive motor rotates forward, causing the spline flange 11 and the ball screw 5 to rotate synchronously. The nut piston 4 is driven by the meshing of internal balls with the ball screw 5. Due to the restriction of the circumferential rotation of the nut piston 4 by the brake caliper body limiting surface 1002, the nut piston 4 can only achieve axial translation, which drives the nut piston cover 3 to press the second friction plate 102. One side of the brake disc is pressed by the second friction plate 102, generating a reaction force on the second friction plate 102. This reaction force is transmitted to the brake caliper body 10 through the nut piston cover 3, nut piston 4, ball screw 5 and planar thrust bearing 6, causing the brake caliper body 10 to move away from the brake disc. The movement of the brake caliper body 10 then causes the first friction plate 101 to synchronously press the other side of the brake disc, thereby forming a friction torque on both sides of the brake disc.

[0042] When the brake is released, it is the reverse process of the braking application process described above. The drive motor 12 has a built-in brake for parking braking when the vehicle is stopped.

[0043] Example

[0044] The basic structure of the electromechanical braking device for a drive-by-wire chassis according to this application embodiment is basically the same as that of Embodiment 1, except for the connection configuration of the drive motor, which is referred to... Figure 11 and Figure 12 As shown, the drive motor mounting bracket 13 includes an inner ring caliper body fixing threaded hole 1301 and an outer ring drive motor fixing hole 1302. The inner ring caliper body fixing threaded hole 1301 is fixedly connected to the brake caliper body drive motor interface 1005 by bolts, and the outer ring drive motor fixing hole 1302 is fixedly connected to other drive motor fixing holes of other specifications by bolts. The drive motor mounting bracket 13 and the splined flange 11 can be adjusted to the corresponding external dimensions and corresponding layout of fixing holes according to the different drive motors installed.

[0045] In addition to the embodiments described above, this utility model may have other implementations. For example, a common threaded screw may be used instead of a ball screw. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by this utility model.

[0046] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electromechanical brake device for a drive-by-wire chassis, characterized by, include: The system comprises a brake caliper body assembly, a brake transmission assembly, a drive motor connection assembly, and a drive motor; the brake caliper body assembly includes a first friction pad, a second friction pad, a brake caliper body mounting bracket, a first guide pin, a second guide pin, a first dust cover, a second dust cover, a first guide pin bolt, a second guide pin bolt, and a brake caliper body; the brake transmission assembly includes a nut piston cap, a nut piston, a ball screw, and a flat thrust bearing; the drive motor connection assembly includes a splined flange and a drive motor mounting bracket.

2. The electromechanical brake apparatus of claim 1, wherein: The brake caliper body contains two areas: an arc-shaped surface and a limiting surface. A bearing groove is provided on the inner side of the tail of the brake caliper body, and a drive motor interface is provided on the outer side of the tail.

3. The electromechanical brake apparatus of claim 1, wherein: The nut piston cap includes a bearing section and a connecting section, wherein the connecting section is provided with a sealing groove; the nut piston includes two areas: an arc-shaped surface and a limiting surface, the arc-shaped surface area is provided with a sealing groove, and the limiting surface area has a rounded rectangular cross-section; the ball screw includes a retaining spring groove and a tail spline; the nut piston and the ball screw are driven by internal ball meshing.

4. The electromechanical brake apparatus of claim 1, wherein: The planar thrust bearing is installed in the bearing groove on the inner side of the tail of the brake caliper body. The ball screw is in axial contact with the planar thrust bearing. The spline at the tail of the ball screw passes through the brake caliper body and engages with the splined flange for transmission.

5. The electromechanical brake apparatus of claim 1, wherein: The outer contour of the nut piston is consistent with the inner contour of the brake caliper body, and the nut piston and the brake caliper body are fitted with a clearance. When the ball screw rotates, the limiting surface of the brake caliper body contacts the limiting surface of the nut piston, thereby restricting the circumferential rotation of the nut piston and realizing axial movement.

6. The electromechanical brake apparatus of claim 1, wherein: The splined flange is a disc with a boss. The inner ring of the boss is provided with a spline groove, and the outer ring of the disc is provided with a fixing hole for the output shaft of the drive motor. The inner ring of the motor mounting bracket is provided with a clamp body fixing threaded hole, and the outer ring is provided with a fixing hole for the drive motor.

7. The electromechanical brake apparatus of claim 1, wherein: The drive motor can be directly fixed to the brake caliper body via a drive motor interface provided on the outer side of the tail of the brake caliper body, or fixed to the drive motor mounting bracket and then indirectly fixed to the brake caliper body; the drive motor is equipped with a brake holder for vehicle parking braking.

Images