Piston assembly of motor brake and assembly process of piston assembly

Abstract

The invention discloses a piston assembly of a motor brake and an assembling process of the piston assembly, and relates to the technical field of motor brakes. Comprising a caliper shell, a caliper body assembly is installed on one side of the caliper shell, a power transmission unit assembly is detachably installed on the caliper body assembly, a positioning pin is arranged on the caliper body assembly, and a positioning hole matched with the positioning pin is formed in the power transmission unit assembly; the caliper body assembly of the caliper comprises a main support, a second support and a third support, wherein the main support is detachably installed on a caliper shell; the sleeve is detachably mounted on the inner side of the main bracket; the nut is connected into the sleeve in a sliding manner; and the ball screw assembly is connected into the nut through a thread. According to the invention, through arrangement of structures such as the caliper body assembly, torque transmission, clamping force transmission and stress support of parts are carried out in a highly integrated manner, installation and signal transmission of a force sensor in a very narrow space are realized, and the performance is reliable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor brake, in particular to a piston assembly of motor brake and an assembling process thereof. BACKGROUND

[0002] In a mechanical electronic brake, a piston assembly is needed to transmit the torque generated by the brake motor and the speed reduction and torque increasing transmission mechanism, and to convert the rotary motion into the braking force on the brake disc. In actual braking, due to the complex working conditions, the piston not only transmits the positive axial braking force, but also receives the tangential force transmitted by the brake disc and the deformation of the caliper shell, and finally needs to transmit the reaction force of braking to the force sensor and provide support to it.

[0003] Unlike the traditional hydraulic brake scheme that transmits the brake clamping force through hydraulic pressure, the mechanical electronic brake needs to transmit the output torque of the brake motor through mechanical devices. However, in the current mechanical electronic brake, the force sensor is difficult to arrange, and when the force sensor is installed, the wire rotation prevention needs to be considered.

[0004] Through retrieval, the application scheme of Chinese patent application No. 202211367046.8 discloses a brake actuator unit, an electromechanical brake and a main shaft drive of an actuator unit. The brake actuator unit has a main shaft that is rotationally driven by an electric motor and a brake piston in the form of a main shaft nut. The piston brake piston surrounds the main shaft and is configured to press on a brake pad. The scheme in the above document has the following disadvantages: the structure is relatively complex, disassembly and assembly are inconvenient, and the force sensor cannot be well arranged, which still needs to be improved. SUMMARY

[0005] The purpose of the present application is to solve the problems existing in the prior art and provide a piston assembly of motor brake and an assembling process thereof.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0007] A piston assembly of motor brake, comprising a caliper shell, a caliper body assembly is installed on one side of the caliper shell, a power transmission unit assembly is detachably installed on the caliper body assembly, a positioning pin is arranged on the caliper body assembly, and a positioning hole matched with the positioning pin is arranged on the power transmission unit assembly;

[0008] The caliper body assembly comprises:

[0009] A main support is detachably installed on the caliper shell;

[0010] A sleeve is detachably installed on the inner side of the main support;

[0011] A screw nut is slidingly connected in the sleeve;

[0012] The ball screw assembly is connected to the nut through a thread, and one end of the ball screw assembly is connected to the power transmission unit assembly.

[0013] The ball bearing is installed in the sleeve, and the ball screw assembly is rotatably installed on the inner side of the ball bearing.

[0014] The wave spring is installed on the side of the ball bearing close to the nut, and the side of the ball bearing away from the nut is provided with a snap spring.

[0015] The end cover is arranged at one end of the nut, and the end cover is connected to the other friction plate structure.

[0016] The force sensor is detachably installed in the sleeve, the side of the force sensor close to the nut is provided with a flat gasket, the side of the flat gasket away from the force sensor is provided with a cylindrical roller bearing, the side of the cylindrical roller bearing away from the flat gasket is provided with a spherical gasket, and the contact surface between the ball screw assembly and the spherical gasket is a spherical surface structure matched with the inner side of the spherical gasket.

[0017] As a preferred embodiment of the present application, the nut is provided with an anti-rotation key on the outer side, a waist-shaped groove matched with the anti-rotation key is formed on the sleeve, and the anti-rotation key slides in the waist-shaped groove.

[0018] As a preferred embodiment of the present application, the force sensor is provided with an anti-rotation pin, a mounting hole matched with the anti-rotation pin is formed on the sleeve, a rectangular slot is formed on the sleeve for the line of the force sensor to pass through, one end of the rectangular slot is communicated with the inside of the sleeve, and a counterbore is formed on the inner side of the sleeve, and the force sensor is detachably installed in the counterbore.

[0019] As a preferred embodiment of the present application, the end cover is provided with a sealing ring on the outer side close to the power transmission unit assembly, and the sleeve is provided with a sealing ring on the inner side away from the power transmission unit assembly.

[0020] An assembly process of a piston assembly of a motor brake, comprising the following steps:

[0021] S1: installing the force sensor in the sleeve;

[0022] S2: sequentially installing the spherical gasket, the cylindrical roller bearing and the flat gasket on the outer side of the ball screw assembly;

[0023] S3: penetrating one end of the ball screw assembly through the force sensor and the sleeve;

[0024] S4: installing the wave spring, the ball bearing and the snap spring;

[0025] S5: installing the nut between the sleeve and the ball screw assembly;

[0026] S6: Install friction plate structure on end cap;

[0027] S7: Secure the caliper housing using the auxiliary assembly device, and install the sleeve and main bracket onto the caliper housing;

[0028] S8: Install the power transmission unit assembly onto the caliper body assembly to ensure effective transmission of the structure and connect all leads.

[0029] As a preferred embodiment of the present invention, the auxiliary assembly device includes:

[0030] The base has a support platform installed on it. The bottom of the caliper housing has a V-shaped structure, and the support platform has a cavity that matches the bottom of the caliper housing.

[0031] Side bracket, the side bracket is installed on the outer wall of one side of the support platform, and a support frame is installed on the side bracket;

[0032] An auxiliary positioning mechanism is mounted on a support frame.

[0033] As a preferred embodiment of the present invention, the auxiliary positioning mechanism includes:

[0034] The movable frame is mounted vertically on the support frame.

[0035] Positioning seat, the positioning seat is installed at the bottom of the movable frame;

[0036] The lifting frame is installed inside the positioning seat and moves up and down. A positioning plate is fixed at the bottom of the lifting frame and the bottom end of the positioning plate slides up and down against the inner wall of the bottom of the positioning seat.

[0037] The lifting control unit is installed inside the positioning seat and is used to control the lifting of the lifting frame.

[0038] The bottom of the caliper housing has an "I" shaped structure, and the distance between the two positioning plates is adapted to the width of the bottom of the caliper housing; the bottom ends of the two positioning plates have an arc-shaped structure that gradually moves away from each other; the support platform has a through-hole adapted to the position of the positioning plates.

[0039] As a preferred embodiment of the present invention, the lifting control unit includes a lifting drive motor, which is installed in the positioning seat. The output end of the lifting drive motor is connected to a threaded rod, which is threadedly connected to the inner wall of the lifting frame.

[0040] As a preferred embodiment of the present invention: a U-shaped tube is fixed to the side of the positioning seat, a first sliding rod is slidably connected to the inner wall of one end of the U-shaped tube, one end of the first sliding rod is located inside the U-shaped tube, and the other end of the first sliding rod is connected to an arc plate, and the arc plate and the positioning seat are connected by a first spring;

[0041] The inner wall of the other end of the U-shaped pipe is slidably connected with a second sliding rod, one end of the second sliding rod is connected with a clamping plate, and the clamping plate and the U-shaped pipe are connected through a second spring; a plurality of rolling balls are movably arranged in the U-shaped pipe, the rolling balls are filled between the second sliding rod and the first sliding rod, and side grooves are arranged on both sides of the friction plate and are matched with the clamping plate in shape;

[0042] The lifting frame is provided with a pressing part.

[0043] As a preferred embodiment of the present application, the pressing part comprises a roller frame installed on the side wall of the lifting frame, a pressure roller installed on the roller frame, and an arc-shaped plate located on the movement path of the pressure roller.

[0044] The present application has the following advantages:

[0045] 1. The present application realizes the installation of a force sensor in a very small space, signal transmission, and reliable performance by setting a caliper body assembly and other structures for highly integrated torque transmission, clamping force transmission, and part stress support.

[0046] 2. The present application can limit the angular rotation of the nut in the sleeve by setting an anti-rotation key and other structures, thereby improving reliability. The lead of the force sensor is led out through the rectangular groove, the counterbore of the sleeve is matched with the shell of the force sensor, and the anti-rotation pin is inserted into the mounting hole, thereby improving the reliability of the connection.

[0047] 3. The present application can preliminarily place the caliper shell inside the support table by setting a positioning seat and a lifting frame, and drive the lifting frame to move downward based on the work of the lifting control part. The two positioning plates constrain and fix the bottom of the caliper shell, thereby improving the stability of the fixation of the caliper shell.

[0048] 4. The present application can preliminarily position the bottom of the caliper shell by the positioning plate during the downward movement of the lifting frame, and make the two clamping plates clamp the side grooves on both sides of the friction plate under the transmission of the rolling balls, thereby achieving further fixation for assembly operation, based on the extrusion of the pressure roller on the arc-shaped plate. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 A structure diagram of a piston assembly of a motor brake is provided in the present application;

[0050] Figure 2 A structure diagram of a caliper shell and a caliper body assembly of a piston assembly of a motor brake is provided in the present application;

[0051] Figure 3 A structure diagram of a ball screw assembly and a nut of a piston assembly of a motor brake is provided in the present application;

[0052] Figure 4 Structure diagram of sleeve of piston assembly of motor brake proposed by the present application;

[0053] Figure 5 Structure diagram of sleeve and force sensor of piston assembly of motor brake proposed by the present application;

[0054] Figure 6 Structure diagram of force sensor of piston assembly of motor brake proposed by the present application;

[0055] Figure 7 Structure diagram of auxiliary assembly device of piston assembly of motor brake proposed by the present application;

[0056] Figure 8 Structure diagram of base and support table of auxiliary assembly device of piston assembly of motor brake proposed by the present application;

[0057] Figure 9 Structure diagram of cooperation of clamping plate and friction plate of auxiliary assembly device of piston assembly of motor brake proposed by the present application;

[0058] Figure 10 Structure diagram of U-shaped tube section of auxiliary assembly device of piston assembly of motor brake proposed by the present application.

[0059] In the figure: 1 caliper housing, 2 positioning pin, 3 power transmission unit assembly, 4 caliper body assembly, 5 friction plate, 6 sealing ring, 7 spherical washer, 8 wave spring, 9 clasp spring, 10 ball bearing, 11 force sensor, 12 flat washer, 13 cylindrical roller bearing, 14 ball screw assembly, 15 nut, 16 sleeve, 17 end cover, 18 anti-rotation key, 19 waist-shaped groove, 20 rectangular groove, 21 mounting hole, 22 counterbore, 23 anti-rotation pin, 24 base, 25 support table, 26 movable frame, 27 support frame, 28 lifting frame, 29 side support, 30 through hole, 31 side groove, 32 lifting drive motor, 33 positioning plate, 34 clamping plate, 35 U-shaped tube, 36 positioning seat, 37 vertical plate, 38 threaded rod, 39 first spring, 40 second spring, 41 ball, 42 first sliding rod, 43 arc-shaped plate, 44 pressure roller, 45 second sliding rod. DETAILED DESCRIPTION

[0060] The technical solutions of the present application will be further described in detail in combination with specific embodiments.

[0061] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein like symbols have like meanings. The embodiments described below are examples of implementations and it is, therefore, contemplated that not all of the embodiments described below are to be construed as being of equivalent scope. Other embodiments can be used and structural or logical changes can be made without departing from the scope of the present application. The following detailed description is, therefore, not to be taken in a limiting sense.

[0062] Embodiment 1:

[0063] A piston assembly of a motor brake, as shown in the figure, comprises a caliper shell 1, a caliper body assembly 4 is installed on one side of the caliper shell 1, a power transmission unit assembly 3 is detachably installed on the caliper body assembly 4, a positioning pin 2 is arranged on the caliper body assembly 4, and a positioning hole matched with the positioning pin 2 is arranged on the power transmission unit assembly 3. Figures 1-6

[0064] The caliper body assembly 4 comprises:

[0065] A main support is detachably installed on the caliper shell 1.

[0066] A sleeve 16 is detachably installed on the inner side of the main support.

[0067] A nut 15 is slidingly connected in the sleeve 16.

[0068] A ball screw assembly 14 is threadedly connected in the nut 15, and one end of the ball screw assembly 14 is connected to the power transmission unit assembly 3.

[0069] A ball bearing 10 is installed in the sleeve 16, and the ball screw assembly 14 is rotatably installed on the inner side of the ball bearing 10.

[0070] A wave spring 8 is installed on one side of the ball bearing 10 close to the nut 15, and a circlip 9 is arranged on the other side of the ball bearing 10 away from the nut 15.

[0071] An end cover 17 is arranged on one end of the nut 15, and the end cover 17 is connected to another friction plate structure.

[0072] A force sensor 11 is detachably installed in the sleeve 16, a flat gasket 12 is arranged on one side of the force sensor 11 close to the nut 15, a cylindrical roller bearing 13 is installed on the other side of the flat gasket 12 away from the force sensor 11, a spherical gasket 7 is installed on the other side of the cylindrical roller bearing 13 away from the flat gasket 12, and the contact surface between the ball screw assembly 14 and the spherical gasket 7 is in a spherical surface structure matched with the inner side of the spherical gasket 7.

[0073] ​The ball screw of the ball screw assembly 14 is sequentially supported by the spherical gasket 7, the cylindrical roller bearing 13, the plane gasket 12, the force sensor 11 and the sleeve 16.

[0074] By arranging the caliper body assembly 4 and the like, the highly integrated torque transmission, clamping force transmission and part force support are realized, the installation of the force sensor in a very narrow space is realized, the signal transmission is realized, and the performance is reliable.

[0075] In order to ensure reliable movement of the nut 15, as shown, the nut 15 is provided with an anti-rotation key 18 outside, and the sleeve 16 is provided with a waist-shaped groove 19 matched with the anti-rotation key 18. Figure 3 The anti-rotation key 18 is slidably arranged in the waist-shaped groove 19.

[0076] By arranging the anti-rotation key 18 and the like, the angle rotation of the nut 15 in the sleeve 16 is limited, and the reliability is improved.

[0077] In order to facilitate disassembly, as shown, Figure 4 , Figure 5 The force sensor 11 is provided with an anti-rotation pin 23, the sleeve 16 is provided with a mounting hole 21 matched with the anti-rotation pin 23, the sleeve 16 is provided with a rectangular groove 20 for the wire of the force sensor 11 to pass through, one end of the rectangular groove 20 is in communication with the inside of the sleeve 16, and the inside of the sleeve 16 is provided with a counterbore 22, and the force sensor 11 is detachably arranged in the counterbore 22.

[0078] By arranging the rectangular groove 20 and the like, the lead wire of the force sensor 11 is led out through the rectangular groove 20, the counterbore 22 of the sleeve 16 is matched with the shell of the force sensor 11, the anti-rotation pin 23 is inserted into the mounting hole 21, and the reliability of the connection is improved.

[0079] In order to improve the structural stability, as shown, Figure 2 The sealing ring 6 is arranged on the outside of one end of the caliper body 1 close to the power transmission unit assembly 3 and on the inside of one end of the sleeve 16 away from the power transmission unit assembly 3.

[0080] Embodiment 2:

[0081] A piston assembly of a motor brake is assembled, as shown, Figures 1-10 The embodiment is based on the embodiment 1, and includes the following steps:

[0082] S1: The force sensor 11 is arranged in the sleeve 16;

[0083] S2: The spherical gasket 7, the cylindrical roller bearing 13 and the plane gasket 12 are sequentially arranged outside the ball screw assembly 14.

[0084] S3: Pass the force sensor 11 and the sleeve 16 through one end of the ball screw assembly 14;

[0085] S4: Install wave spring 8, ball bearing 10 and snap ring 9;

[0086] S5: Install the nut 15 between the sleeve 16 and the ball screw assembly 14;

[0087] S6: Install a friction plate structure on the end cap 17;

[0088] S7: Fix the caliper housing 1 using the auxiliary assembly device, and install the sleeve 16 and the main bracket onto the caliper housing 1;

[0089] S8: Install the power transmission unit assembly 3 onto the caliper body assembly 4 to ensure effective transmission of the structure and connect all leads.

[0090] To facilitate installation; such as Figures 7-10 As shown, the auxiliary assembly device includes:

[0091] The base 24 has a support platform 25 mounted on it. The bottom of the caliper housing 1 has a V-shaped structure, and the support platform 25 has a cavity that matches the bottom of the caliper housing 1.

[0092] Side bracket 29 is installed on one outer wall of support platform 25, and support frame 27 is installed on side bracket 29;

[0093] An auxiliary positioning mechanism is mounted on the support frame 27.

[0094] To facilitate positioning; such as Figures 7-10 As shown, the auxiliary positioning mechanism includes:

[0095] The movable frame 26 is mounted vertically on the support frame 27.

[0096] Positioning seat 36 is installed at the bottom of the movable frame 26;

[0097] The lifting frame 28 is installed inside the positioning seat 36 and moves up and down. The bottom of the lifting frame 28 is fixed with a positioning plate 33, and the bottom end of the positioning plate 33 slides up and down on the bottom inner wall of the positioning seat 36.

[0098] The lifting control unit is installed in the positioning seat 36 and is used to control the lifting of the lifting frame 28.

[0099] The bottom of the caliper housing 1 has an "I" shaped structure, and the distance between the two positioning plates 33 is adapted to the width of the bottom of the caliper housing 1; the bottom ends of the two positioning plates 33 are arc-shaped structures that gradually move away from each other; the support platform 25 has a through-hole 30 that is adapted to the position of the positioning plates 33.

[0100] By setting the positioning seat 36, the lifting frame 28 and other structures, the caliper shell 1 can be initially placed inside the support table 25. Based on the lifting control part working, the lifting frame 28 is driven to move downward, and the two positioning plates 33 are used to constrain and fix the bottom of the caliper shell 1, thereby improving the stability of fixing the caliper shell 1.

[0101] In order to facilitate the driving of the lifting frame 28 to move up and down, as shown in Figure 10 The lifting control part includes a lifting drive motor 32 installed in the positioning seat 36. The output end of the lifting drive motor 32 is transmissionally connected with a threaded rod 38 which is threadedly connected with the inner wall of the lifting frame 28.

[0102] In order to further improve the positioning effect, as shown in Figure 9 , Figure 10 The side surface of the positioning seat 36 is fixed with a U-shaped tube 35. The inner wall of one end of the U-shaped tube 35 is slidingly connected with a first sliding rod 42. One end of the first sliding rod 42 is located in the U-shaped tube 35, and the other end of the first sliding rod 42 is connected with an arc-shaped plate 43. The arc-shaped plate 43 and the positioning seat 36 are connected through a first spring 39.

[0103] The inner wall of the other end of the U-shaped tube 35 is slidingly connected with a second sliding rod 45. One end of the second sliding rod 45 is connected with a clamping plate 34. The clamping plate 34 and the U-shaped tube 35 are connected through a second spring 40. A plurality of rolling balls 41 are movably installed in the U-shaped tube 35. The rolling balls 41 are filled between the second sliding rod 45 and the first sliding rod 42. The two sides of the friction plate 5 are provided with side grooves 31 which are adapted to the clamping plate 34.

[0104] The lifting frame 28 is provided with a pressing part.

[0105] In order to facilitate the driving of the lifting frame 28 to move up and down, as shown in Figure 10 The pressing part includes a roller frame installed on the side wall of the lifting frame 28. The roller frame is installed with a pressing wheel 44. The arc-shaped plate 43 is located in the movement path of the pressing wheel 44.

[0106] By setting the pressing wheel 44 and other structures, the bottom of the caliper shell 1 can be preliminarily positioned by the positioning plate 33 during the downward movement of the lifting frame 28. With the continuous movement of the lifting frame 28, the two clamping plates 34 are clamped to the side grooves 31 on both sides of the friction plate 5 under the transmission of the rolling balls 41, so as to achieve further fixing, thereby facilitating assembly work.

[0107] The positioning seat 36 is installed with a vertical plate 37 away from the clamping plate 34.

[0108] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A piston assembly for a motor brake, characterized by The utility model provides a kind of caliper, including caliper shell (1), one side of the caliper shell (1) is equipped with caliper body assembly (4), detachably mounted with power transmission unit assembly (3) on caliper body assembly (4), positioning pin (2) is provided on caliper body assembly (4), positioning hole is provided on power transmission unit assembly (3) and is matched with positioning pin (2); The caliper body assembly (4) comprises: A main support is detachably mounted on the caliper shell (1); A sleeve (16) is detachably mounted on the inner side of the main support; A nut (15) is slidingly connected in the sleeve (16); A ball screw assembly (14) is threadedly connected in the nut (15), and one end of the ball screw assembly (14) is connected to the power transmission unit assembly (3); A ball bearing (10) is mounted in the sleeve (16), and the ball screw assembly (14) is rotatably mounted on the inner side of the ball bearing (10); A wave spring (8) is mounted on one side of the ball bearing (10) close to the nut (15), and a circlip (9) is provided on the side of the ball bearing (10) away from the nut (15); An end cover (17) is provided on one end of the nut (15), and the end cover (17) is connected to another friction plate structure; A force sensor (11) is detachably mounted in the sleeve (16), and a flat gasket (12) is provided on one side of the force sensor (11) close to the nut (15). A cylindrical roller bearing (13) is mounted on the side of the flat gasket (12) away from the force sensor (11), a spherical gasket (7) is mounted on the side of the cylindrical roller bearing (13) away from the flat gasket (12), and the contact surface between the ball screw assembly (14) and the spherical gasket (7) is a spherical surface structure matched with the inner side of the spherical gasket (7).

2. A piston assembly for a motor vehicle brake according to claim 1, wherein A rotation prevention key (18) is mounted on the outer side of the nut (15), and a waist-shaped groove (19) matched with the rotation prevention key (18) is formed in the sleeve (16), and the rotation prevention key (18) slides in the waist-shaped groove (19).

3. A piston assembly for a motor vehicle brake according to claim 2, wherein A rotation prevention pin (23) is mounted on the force sensor (11), and a mounting hole (21) matched with the rotation prevention pin (23) is formed in the sleeve (16). A rectangular slot (20) is formed in the sleeve (16) for the wire of the force sensor (11) to pass through, and one end of the rectangular slot (20) is in communication with the inside of the sleeve (16). A counterbore (22) is formed in the inner side of the sleeve (16), and the force sensor (11) is detachably mounted in the counterbore (22).

4. A piston assembly for a motor vehicle brake according to claim 3, wherein A sealing ring (6) is mounted on the outer side of one end of the caliper shell (1) close to the power transmission unit assembly (3) and on the inner side of the other end of the sleeve (16) away from the power transmission unit assembly (3).

5. A process for assembling a piston assembly of a motor brake according to any one of claims 1-4, characterized in that, The utility model provides a kind of caliper, including the following steps: S1: mounting the force sensor (11) in the sleeve (16); S2: sequentially mounting the spherical gasket (7), the cylindrical roller bearing (13) and the flat gasket (12) on the outer side of the ball screw assembly (14); S3: penetrating the force sensor (11) and the sleeve (16) with one end of the ball screw assembly (14). S4: Install wave spring (8), ball bearing (10) and snap ring (9); S5: Install the nut (15) between the sleeve (16) and the ball screw assembly (14); S6: Install a friction plate structure on the end cap (17); S7: Fix the caliper housing (1) using the auxiliary assembly device, and install the sleeve (16) and the main bracket onto the caliper housing (1); S8: Install the power transmission unit assembly (3) onto the caliper body assembly (4) to ensure the effective establishment of the transmission of the structure, and connect the leads.

6. An assembly process for a piston assembly of a motor vehicle brake, according to claim 5, characterized in that, The auxiliary assembly device includes: The base (24) has a support platform (25) installed on it. The bottom of the caliper housing (1) has a V-shaped structure. The support platform (25) has a cavity that matches the bottom of the caliper housing (1). Side bracket (29) is installed on the outer wall of one side of the support platform (25), and a support frame (27) is installed on the side bracket (29); An auxiliary positioning mechanism is mounted on a support frame (27).

7. An assembly process for a piston assembly of a motor vehicle brake, according to claim 6, characterized in that, The auxiliary positioning mechanism includes: Movable frame (26), which is mounted vertically on support frame (27); Positioning seat (36) is installed at the bottom of the movable frame (26); The lifting frame (28) is installed on the inside of the positioning seat (36) and moves up and down. The bottom of the lifting frame (28) is fixed with a positioning plate (33), and the bottom end of the positioning plate (33) slides up and down on the inner wall of the bottom of the positioning seat (36). The lifting control unit is installed in the positioning seat (36) and is used to control the lifting of the lifting frame (28); The bottom of the caliper housing (1) has an "I" shaped structure, and the distance between the two positioning plates (33) is adapted to the bottom width of the caliper housing (1); the bottom ends of the two positioning plates (33) are arc-shaped structures that gradually move away from each other; the support platform (25) has a through hole (30) adapted to the position of the positioning plate (33).

8. An assembly process for a piston assembly of a motor vehicle brake according to claim 7, characterized in that The lifting control unit includes a lifting drive motor (32), which is installed in the positioning seat (36). The output end of the lifting drive motor (32) is connected to a threaded rod (38), which is threaded to the inner wall of the lifting frame (28).

9. An assembly process for a piston assembly of a motor vehicle brake according to claim 8, characterized in that The positioning seat (36) is fixed with a U-shaped tube (35) on its side. A first slide rod (42) is slidably connected to the inner wall of one end of the U-shaped tube (35). One end of the first slide rod (42) is located inside the U-shaped tube (35), and the other end of the first slide rod (42) is connected to an arc plate (43). The arc plate (43) and the positioning seat (36) are connected by a first spring (39). A second slide rod (45) is slidably connected to the inner wall of the other end of the U-shaped tube (35). One end of the second slide rod (45) is connected to the clamping plate (34). The clamping plate (34) and the U-shaped tube (35) are connected by a second spring (40). Multiple balls (41) are movably installed inside the U-shaped tube (35). The balls (41) are filled between the second slide rod (45) and the first slide rod (42). Side grooves (31) are provided on both sides of the friction plate (5). The shape of the side grooves (31) is adapted to the clamping plate (34). The lifting frame (28) is provided with a pressing part.

10. A process for assembling a piston assembly of a motor vehicle brake according to claim 9, characterized in that, The pressing part comprises a roller frame installed on the side wall of the lifting frame (28), and a pressing wheel (44) is installed on the roller frame, and the arc-shaped plate (43) is located on the movement path of the pressing wheel (44).

Images