Spring type electronic mechanical brake

Abstract

The invention relates to a spring type electronic mechanical brake structure, and belongs to the technical field of automobile braking. The brake caliper body is fixedly connected with the gear motor, the transmission mechanism is arranged in the brake caliper body, a lead screw of the transmission mechanism is fixedly connected with an output shaft of the gear motor, the lead screw makes contact with one side of the brake force sensor through a thrust bearing, the other side of the brake force sensor is fixedly connected with the brake caliper body, and the first piston is installed in a main hole of the brake caliper body. The belleville spring is installed between the first piston and the brake caliper body in a concave face-to-concave face mode, the second piston is installed in a first piston hole, and the friction plate assembly is installed on the brake caliper body. The brake device has the advantages of being novel in structure, capable of providing large braking force and safety backup, shorter in braking response time, capable of effectively meeting the braking force requirement of large vehicles, stable in work, high in reliability, higher in bearing capacity and longer in service life.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile brakes, and in particular relates to a spring type electronic mechanical brake structure. Background Art

[0002] The brake system is an indispensable part of the vehicle. The main function of the brake system is to slow down or even stop a moving car, keep the speed of a car driving downhill stable, and keep a stopped car still. With the development of automobile electronics and intelligence, the traditional hydraulic and pneumatic transmission methods can no longer meet the design requirements. The electronic mechanical brake (EMB) replaces the traditional hydraulic energy with cleaner electric energy, and replaces the traditional hydraulic pipeline with lighter, faster and more sensitive wires. It has the characteristics of intelligent control, conforms to the development direction of automobile modularization, integration, and mechatronics, and will become the development direction of future vehicle brake systems. The electronic mechanical brake (EMB) system controls the current of the brake motor through the electronic control unit, and clamps the brake disc from both sides through the brake caliper to achieve wheel braking. Its working principle: When the car is driving under different working conditions, if there is a need to decelerate, the driver will step on the brake pedal. The brake pedal sensor on the electronic brake pedal detects brake signals such as pedal acceleration, displacement and pedal force. The ECU unit receives the brake command signal through the vehicle network, integrates other sensor signals under the current vehicle driving state and combines the corresponding intention recognition algorithm to identify the driver's braking intention, and calculates the optimal braking force required for each wheel in real time. The four independent wheel brake modules receive the output signal of the ECU and transmit the required braking force to the corresponding wheel-end control module to achieve the braking purpose. At present, the electronic mechanical brake EMB is still in the research stage. The difficulties faced by the structural design are mainly: the demand for compact structure, the demand for simplified structure, the demand for system safety backup, the demand for reliable parking structure, etc., especially large vehicles such as mining transportation and special vehicles frequently face large slope road conditions. How to effectively reduce the volume and mass of the electronic mechanical brake actuator under the premise of meeting the braking needs of the whole vehicle has become the key to its popularization and application. Summary of the invention

[0003] The present invention provides a spring type electromechanical brake, the purpose of which is to effectively reduce the volume of the electromechanical brake actuator and effectively meet the braking requirements of large vehicles.

[0004] The technical solution adopted by the present invention is, including a brake caliper body, a transmission mechanism, a reduction motor, a second piston, a disc spring, a braking force sensor, a thrust bearing, a first piston and a friction plate assembly, wherein the brake caliper body is fixedly connected to the reduction motor, the transmission mechanism is arranged inside the brake caliper body, the screw of the transmission mechanism is fixedly connected to the output shaft of the reduction motor, the screw contacts one side of the braking force sensor through the thrust bearing, the other side of the braking force sensor is fixedly connected to the brake caliper body, the first piston is installed in the main hole of the brake caliper body, the concave surface of the disc spring is installed between the first piston and the brake caliper body, the second piston is installed in the first piston hole, and the friction plate assembly is installed on the brake caliper body.

[0005] The brake caliper body is a split structure, including a main caliper body and an auxiliary caliper body. The main caliper body and the auxiliary caliper body are fixedly connected by bolts, and the auxiliary caliper body is fixedly connected to the reduction motor.

[0006] A sealing ring 1 is arranged between the main caliper body and the auxiliary caliper body.

[0007] A second sealing ring and a third sealing ring are arranged between the main caliper body and the first piston.

[0008] A sealing ring 4 is arranged between the auxiliary caliper body and the reduction motor.

[0009] The transmission mechanism includes a screw, a retaining ring, a roller assembly and a support frame, wherein the roller assembly is rotatably arranged on the outer circumferential side of the screw, the roller assembly is assembled in the inner hole of the first piston, the roller assembly includes a plurality of planetary columns evenly arranged around the outer circumferential side of the screw, and a support frame arranged at the heads of both ends of the planetary columns, both ends of the planetary columns are engaged with the internal threaded holes in the first piston hole, the middle position of the planetary column is engaged with the external thread arranged on the outer circumferential side of the screw, the support frame is connected to the first piston through the retaining ring, and is used to limit the axial position of the planetary column.

[0010] The lead screw is provided with a vent hole extending axially therethrough.

[0011] A sealing ring 5 is provided between the second piston and the first piston.

[0012] The friction plate assembly includes an inner friction plate, an inner magnet, an outer friction plate, an outer magnet and a bolt, wherein the inner friction plate is connected to the second piston via the inner magnet, the outer friction plate is connected to the front claw of the brake caliper body via the magnet, the bolt is threadedly connected to the brake caliper body, and the inner friction plate and the outer friction plate move axially on the bolt.

[0013] The advantages of the present invention are novel structure, including a brake caliper body, a transmission mechanism arranged inside the caliper body and a reduction motor arranged on the caliper body. The brake caliper body is a split structure, and a disc spring is arranged in the caliper body for parking brake backup, with a compact structure and small volume; the transmission mechanism is a planetary roller screw structure, including a screw connected to the output shaft of the reduction motor at one end and a roller assembly rotatably arranged on the outer circumference of the screw. Compared with the traditional ball screw transmission structure, the planetary roller screw structure has a stronger load-bearing capacity and a longer service life; a braking force sensor is provided at one end of the screw close to the reduction motor, the screw contacts one side of the braking force sensor through a thrust bearing, and the other side of the braking force sensor is fixedly connected to the caliper body. By setting the braking force sensor, the purpose of accurately controlling the braking force can be achieved according to the comparison between the collected braking force and the set braking force; a magnet is used to install the friction plate on the brake caliper body and the piston, the friction plate can move along the axial direction of the bolt, the friction plate is firmly connected to the piston and the brake caliper body, and is not easy to loosen or fall off, and the structure and process are simpler.

[0014] The present invention can provide greater braking force and safety backup, has a shorter braking response time, can effectively meet the braking force requirements of large vehicles, operates smoothly, has high reliability, has a stronger load-bearing capacity, and has a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 is a schematic structural diagram of a brake caliper body of the present invention; Figure 3 It is a structural schematic diagram of the transmission mechanism of the present invention; Figure 4 It is a structural schematic diagram of the friction plate assembly of the present invention. DETAILED DESCRIPTION

[0016] like Figure 1 As shown, it includes a brake caliper body 1, a transmission mechanism 2, a reduction motor 3, a second piston 4, a disc spring 5, a braking force sensor 6, a thrust bearing 7, a first piston 8 and a friction plate assembly 9, wherein the brake caliper body 1 is fixedly connected to the reduction motor 3, the transmission mechanism 2 is arranged inside the brake caliper body 1, the lead screw of the transmission mechanism 2 is fixedly connected to the output shaft of the reduction motor 3, the lead screw contacts one side of the braking force sensor 6 through the thrust bearing 7, the other side of the braking force sensor 6 is fixedly connected to the brake caliper body 1, the first piston 8 is installed in the main hole of the brake caliper body 1, the disc spring 5 is installed concavely to the concave surface between the first piston 8 and the brake caliper body 1, the second piston 4 is installed in the hole of the first piston 8, and the friction plate assembly 9 is installed on the brake caliper body 1.

[0017] The brake caliper body 1 is a split structure, including a main caliper body 101 and an auxiliary caliper body 102 . The main caliper body 101 and the auxiliary caliper body 102 are fixedly connected by bolts, and the auxiliary caliper body 102 is fixedly connected to the reduction motor 3 .

[0018] A sealing ring 11 is arranged between the main caliper body 101 and the auxiliary caliper body 102 .

[0019] A second sealing ring 10 and a third sealing ring 12 are provided between the main caliper body 101 and the first piston 8 .

[0020] A sealing ring 13 is provided between the auxiliary clamp body 102 and the reduction motor 3.

[0021] The transmission mechanism 2 includes a screw 201, a retaining ring 202, a roller assembly 203 and a support frame 204, wherein the roller assembly 203 is rotatably arranged on the outer circumference side of the screw 201, and the roller assembly 203 is assembled in the inner hole of the first piston 8. The roller assembly 203 includes a plurality of planetary columns evenly arranged around the outer circumference side of the screw 201, and a support frame 204 arranged at the heads of both ends of the planetary columns, both ends of the planetary columns are engaged with the internal threaded holes in the hole of the first piston 8, and the middle position of the planetary column is engaged with the external thread arranged on the outer circumference side of the screw 201. The support frame 204 is connected to the first piston 8 through the retaining ring 202, which is used to limit the axial position of the planetary column.

[0022] The lead screw 201 has an axially penetrating vent hole.

[0023] A sealing ring 5 14 is provided between the second piston 4 and the first piston 8 .

[0024] The friction plate assembly 9 includes an inner friction plate 901, an inner magnet 902, an outer friction plate 903, an outer magnet 904, and a bolt 905, wherein the inner friction plate 901 is connected to the second piston 4 via the inner magnet 902, the outer friction plate 903 is connected to the front claw of the brake caliper body 1 via the magnet 904, the bolt 905 is threadedly connected to the brake caliper body 1, and the inner friction plate 901 and the outer friction plate 903 move axially on the bolt 905 to clamp the brake disc 15 to achieve braking.

[0025] How it works After receiving the ECU signal, the output shaft of the reduction motor 13 drives the lead screw 18 to rotate forward and reversely, and the planetary roller assembly 203 drives the piston to move along the axial direction of the lead screw, pushing the friction plate to clamp the brake disc to achieve braking, and the disc spring 5 is compressed in the reverse direction for braking backup. The spring brake mechanical mechanism is added, and the electric energy is used as the energy source. The electric energy is transmitted through the wire, which shortens the braking response time and can effectively meet the braking needs of large vehicles; specifically, it includes: (1) When the vehicle is turned off and not in use, the spring force of the disc spring 5 pushes the first piston 8, which in turn pushes the second piston 4 to compress the inner friction plate 901 and the outer friction plate 903 to generate friction force. This friction force prevents the brake disc 15 from rotating, and the brake disc in turn prevents the wheel from rotating to implement the parking brake.

[0026] (2) When the vehicle's running brake is released, the vehicle ECU sends a brake release signal to the reduction motor 3. After the reduction motor 3 receives the brake release signal, it rotates in the opposite direction, driving the lead screw 201 to rotate in the opposite direction. With the cooperation of the threads between the lead screw 201, the planetary roller assembly 203 and the first piston 8, the first piston 8 and the second piston 4 are driven to move axially along the lead screw 201. The axial movement of the first piston 8 compresses the disc spring 5, and the second piston 4 drives the inner friction plate 901 to move away from the brake disc 15. The inner friction plate 901 and the outer friction plate 903 move away from the brake disc 15, and the brake is released.

[0027] (3) When the vehicle brakes, the vehicle ECU sends a braking signal to the reduction motor 3. After receiving the braking signal, the reduction motor 3 rotates forward, driving the lead screw 201 to rotate forward. Under the cooperation of the threads between the lead screw 201, the planetary roller assembly 203 and the first piston 8, the first piston 8 and the second piston 4 are driven to move along the axial direction of the lead screw. The disc spring 5 releases the compression to push the first piston 8, and the second piston 4 pushes the inner friction plate 901 to move toward the brake disc 15 until the inner friction plate 901 and the outer friction plate 903 clamp the brake disc 15, and the magnitude of the braking force collected by the braking force sensor 6 is equal to the set braking force, so as to achieve the purpose of accurately controlling the braking force, and then the reduction motor 3 is turned off.

Claims

1. A spring-type electromechanical brake, characterized in that: It includes a brake caliper body, a transmission mechanism, a reduction motor, a second piston, a disc spring, a braking force sensor, a thrust bearing, a first piston and a friction plate assembly, wherein the brake caliper body is fixedly connected to the reduction motor, the transmission mechanism is arranged inside the brake caliper body, the lead screw of the transmission mechanism is fixedly connected to the output shaft of the reduction motor, the lead screw contacts one side of the braking force sensor through the thrust bearing, the other side of the braking force sensor is fixedly connected to the brake caliper body, the first piston is installed in the main hole of the brake caliper body, the concave surface of the disc spring is installed between the first piston and the brake caliper body, the second piston is installed in the first piston hole, and the friction plate assembly is installed on the brake caliper body.

2. A spring-type electromechanical brake according to claim 1, characterized in that: The brake caliper body is a split structure, including a main caliper body and an auxiliary caliper body. The main caliper body and the auxiliary caliper body are fixedly connected by bolts, and the auxiliary caliper body is fixedly connected to the reduction motor.

3. A spring-type electromechanical brake according to claim 2, characterized in that: A sealing ring 1 is arranged between the main caliper body and the auxiliary caliper body.

4. A spring-type electromechanical brake according to claim 2, characterized in that: A second sealing ring and a third sealing ring are arranged between the main caliper body and the first piston.

5. A spring-type electromechanical brake according to claim 2, characterized in that: A sealing ring 4 is arranged between the auxiliary caliper body and the reduction motor.

6. The spring-type electromechanical brake according to claim 1, characterized in that: The transmission mechanism includes a screw, a retaining ring, a roller assembly and a support frame, wherein the roller assembly is rotatably arranged on the outer circumferential side of the screw, the roller assembly is assembled in the inner hole of the first piston, the roller assembly includes a plurality of planetary columns evenly arranged around the outer circumferential side of the screw, and a support frame arranged at the heads of both ends of the planetary columns, both ends of the planetary columns are engaged with the internal threaded holes in the first piston hole, the middle position of the planetary column is engaged with the external thread arranged on the outer circumferential side of the screw, the support frame is connected to the first piston through the retaining ring, and is used to limit the axial position of the planetary column.

7. A spring-type electromechanical brake according to claim 6, characterized in that: The lead screw is provided with a vent hole extending axially therethrough.

8. The spring-type electromechanical brake according to claim 1, characterized in that: A sealing ring 5 is provided between the second piston and the first piston.

9. The spring-type electromechanical brake according to claim 1, characterized in that: The friction plate assembly includes an inner friction plate, an inner magnet, an outer friction plate, an outer magnet and a bolt, wherein the inner friction plate is connected to the second piston via the inner magnet, the outer friction plate is connected to the front claw of the brake caliper body via the magnet, the bolt is threadedly connected to the brake caliper body, and the inner friction plate and the outer friction plate move axially on the bolt.

Images