Coaxial direct-drive type electric control braking system

Abstract

The utility model relates to a coaxial direct-drive type electric control braking system in the technical field of automobiles. The coaxial direct-drive type electric control braking system comprises a motor, calipers, a piston cavity, a piston, a calipers mounting bracket, a motor shaft, an axial thrust bearing, an inner brake block, an outer brake block, a guide device and a spring buffer device, the caliper comprises a caliper body and a caliper claw, the caliper body and the caliper claw are fixedly connected together, the overall structure of the caliper claw is in an L shape, and the piston cavity is formed in the caliper body; one end of the piston is arranged in the piston cavity, and the other end of the piston is in contact with the inner brake block; a motor shaft penetrates through the axial thrust bearing, one end of the motor shaft is connected with the motor, and the other end of the motor shaft is connected with the piston through a lead screw nut structure; the outer brake blocks are arranged on the inner sides of the caliper claws. The large-torque direct-drive motor is adopted, the motor can complete the braking process in one circle, the braking period is shortened to be within 30 milliseconds, and the driving braking actuation time requirement is met; and meanwhile, the self-locking function of the lead screw is applied, and parking braking is achieved.

Description

Technical Field

[0001] This utility model relates to a braking system in the field of automotive technology, and in particular to a coaxial direct-drive electric braking system that can meet the requirements of driving braking actuation time. Background Technology

[0002] Electro-hydraulic braking systems, also known as electronic braking systems or electro-hydraulic braking systems, are modern electronic braking systems that integrate electronic technology, control technology, pressure sensing technology, and braking technology. They utilize piezoelectric sensors to detect parameters such as foot force, pedal travel, and pedal speed, transmitting these signals to a control unit for processing. Ultimately, the control unit automatically adjusts the hydraulic pressure via a motor pump, achieving contact or separation between the brake pads and the brake disc to complete the braking process. Compared to traditional mechanical braking systems, electro-hydraulic braking systems offer advantages such as greater sensitivity, more precise braking, and faster response.

[0003] However, existing electronic braking systems basically use a fixed speed ratio, with an actuation time of more than 100 milliseconds and a long braking response cycle, which cannot meet the requirements of rapid and emergency braking at high speeds and can only be used for parking brakes. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by proposing a coaxial direct-drive electric braking system that not only shortens the braking cycle to less than 30 milliseconds, meeting the requirements for service braking actuation time, but also utilizes a lead screw self-locking function to achieve parking braking.

[0005] This utility model is achieved through the following technical solution: It includes a motor protective shell, a motor, an electronic control module, a motor support body, bolts, a caliper, a piston chamber, a piston, a caliper mounting bracket, a motor shaft, an axial thrust bearing, an inner brake block, an outer brake block, a guide device, and a spring buffer device. The motor and electronic control module are both mounted on the motor support body. The motor protective shell is located around the motor and electronic control module. The motor support body is located at the rear end of the motor protective shell and connected to it with bolts. The caliper is mounted on the caliper mounting bracket. The caliper includes a caliper body and a caliper gripper, which are fixed together. The caliper gripper has an L-shaped overall structure. The piston chamber is located in... Inside the caliper body, one end of the piston is located in the piston chamber, and the other end of the piston contacts the inner brake block, allowing the piston to push the inner brake block to move. An axial thrust bearing is located at the front end of the motor protective housing, through which the motor shaft passes. One end of the motor shaft is connected to the motor, and the other end is connected to the piston via a screw and nut structure. The outer brake block is located inside the caliper grip, and the positions and structures of the outer and inner brake blocks are matched. A guide device connects the caliper, caliper mounting bracket, inner brake block, and outer brake block, guiding the movement of the inner brake block. A spring buffer device is located between the inner and outer brake blocks.

[0006] Furthermore, in this utility model, the guiding device includes a first guide post, a second guide post, a first guide post damping spring, a second guide post damping spring, a first guide post mounting hole, and a second guide post mounting hole. The caliper mounting bracket has a U-shaped structure. The middle parts of the first guide post and the second guide post are respectively fixed to the two sides of the caliper mounting bracket. The first guide post mounting hole and the second guide post mounting hole are respectively arranged on both sides of the caliper body. One end of the first guide post passes through the first guide post damping spring and is arranged in the first guide post mounting hole. One end of the second guide post passes through the second guide post damping spring and is arranged in the second guide post mounting hole. The other end of the first guide post passes through the same side of the inner brake block and the outer brake block in sequence. The other end of the second guide post passes through the other side of the inner brake block and the outer brake block in sequence.

[0007] Furthermore, in this invention, the piston cavity and the cross-section of the piston are both circular, and the piston is equipped with a sealing device.

[0008] Furthermore, in this invention, the axial thrust bearing assembly consists of a thrust plate fixed on the motor shaft and left and right planar bearings.

[0009] The working principle of this invention is that a high-torque direct-drive motor rotates under the control of the electronic control module, and through a rectangular lead screw mechanism, it is directly converted into the linear motion of a piston. This causes the inner and outer brake blocks to clamp the brake disc to generate friction, thereby reducing the wheel's rotational speed or applying braking; or releasing the brake, allowing the inner and outer brake blocks to relax. Simultaneously, because the lead screw mechanism has a self-locking function, it can achieve parking braking after braking is initiated.

[0010] In this invention, the electronic control module is integrated on the stator support of the high-torque direct-drive motor, located on the stator lead-out side for easy wiring; it also shares a protective housing with the motor, achieving high integration. In the rectangular lead screw mechanism, the motor shaft is considered the lead screw, and the piston is considered the lead screw nut, converting circular motion into linear motion. During braking and deceleration, it causes the inner and outer brake blocks to clamp the brake disc to generate friction. The axial thrust bearing assembly consists of a thrust plate fixed to the motor shaft and left and right plane bearings, applying the axial force of the motor shaft to the brake caliper body (motor axial force points left towards the piston) or to the motor protective housing (motor axial force points right towards the drive motor). The piston is fitted inside the brake caliper, and under the circumferential constraint of the brake caliper and the action of the lead screw, it can only perform linear motion. The brake caliper guide mechanism is fixed on the brake caliper mounting bracket. The brake caliper has two guide holes, equipped with corresponding spring buffer devices, allowing the brake caliper and mounting bracket to connect. The brake caliper can slide a certain distance on the guide mechanism, and can be considered a floating brake caliper.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model has a reasonable design and simple structure. It adopts a high-torque direct drive motor and uses torque vector and position multi-loop redundant control. The motor can complete the braking process in one revolution, and the braking cycle is shortened to less than 30 milliseconds, which meets the requirements of the service braking actuation time. Therefore, it can be used for service braking. At the same time, the application of the screw self-locking function realizes the parking brake. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of an embodiment of the present utility model;

[0013] Figure 2 This is an exploded view of a part according to an embodiment of the present utility model;

[0014] Figure 3 for Figure 2 A magnified view of the left side;

[0015] Figure 4 for Figure 3 Enlarged view of the middle part

[0016] Figure 5 for Figure 3 A magnified view of the right side;

[0017] The components include: 1. Motor protective shell; 2. Motor; 3. Electronic control module; 4. Motor support body; 5. Bolt; 6. Motor shaft; 7. Axial thrust bearing assembly; 8. Caliper; 9. Piston; 10. Caliper mounting bracket; 12. Inner brake block; 13. Outer brake block; 14. Piston chamber; 15. Spring buffer device; 801. Caliper body; 802. Caliper gripper; 1101. First guide post; 1102. Second guide post; 1103. First guide post mounting hole; 1104. Second guide post mounting hole; 1105. First guide post damping spring; 1106. Second guide post damping spring. Detailed Implementation

[0018] To facilitate understanding of the present invention, the technical solutions described below are further explained in conjunction with specific embodiments. The examples are for illustrative purposes only, and the present invention is not limited thereto. Operating methods not specifically specified in the following embodiments are generally performed under conventional conditions or according to the product manual. Example

[0019] like Figures 1 to 5As shown, this utility model includes a motor protective shell 1, a motor 2, an electronic control module 3, a motor support body 4, bolts 5, a motor shaft 6, an axial thrust bearing assembly 7, a caliper 8, a piston 9, a caliper mounting bracket 10, an inner brake block 12, an outer brake block 13, a guide device, a piston chamber 14, and a spring buffer device 15. The motor 2 and electronic control module 3 are both arranged on the motor support body 4. The motor protective shell 1 is arranged around the motor 2 and electronic control module 3. The motor support body 4 is arranged at the rear end of the motor protective shell 1 and connected to it by bolts 5. The caliper 8 is arranged on the caliper mounting bracket 10. The caliper 8 includes a caliper body 801 and a caliper gripper 802, which are fixed together. The overall structure of 802 is L-shaped. The piston chamber 14 is arranged inside the caliper body 801. One end of the piston 9 is arranged inside the piston chamber 14, and the other end of the piston 9 is in contact with the inner brake block 12. The piston 9 can push the inner brake block 12 to move. The axial thrust bearing assembly 7 is arranged at the front end of the motor protective shell. The axial thrust bearing assembly 7 consists of a thrust plate fixed on the motor shaft and left and right plane bearings. The motor shaft 6 passes through the axial thrust bearing assembly 7. One end of the motor shaft 6 is connected to the motor 2, and the other end of the motor shaft 6 is connected to the piston 9 through a screw and nut structure. The outer brake block 13 is arranged inside the caliper grip 802. The arrangement and structure of the outer brake block 13 and the inner brake block 12 are matched. The guiding device includes a first guide post 1101, a second guide post 1102, a first guide post mounting hole 1103, a second guide post mounting hole 1104, a first guide post damping spring 1105, and a second guide post damping spring 1106. The caliper mounting bracket 10 has a U-shaped structure. The middle parts of the first guide post 1101 and the second guide post 1102 are respectively fixed to the two sides of the caliper mounting bracket 10. The first guide post mounting holes 1103 and the second guide post mounting holes 1104 are respectively arranged on both sides of the caliper body 801. One end of the guide post 1101 passes through the first guide post damping spring 1105 and is positioned inside the first guide post mounting hole 1103. One end of the second guide post 1102 passes through the second guide post damping spring 1106 and is positioned inside the second guide post mounting hole 1104. The other end of the first guide post 1101 passes through the inner brake block 12 and the outer brake block 13 on the same side in sequence. The other end of the second guide post 1102 passes through the inner brake block 12 and the outer brake block 13 on the other side in sequence. The spring buffer device 15 is arranged between the inner brake block 12 and the outer brake block 13. The piston chamber 14 and the piston 9 both have circular cross-sections, and the piston 9 is equipped with a sealing device.

[0020] This utility model mainly includes three working states, and the transmission relationship can be explained from the following three working states:

[0021] Operating State 1: During vehicle operation, braking or deceleration is initiated by the activation of the high-torque direct-drive motor 2, followed by the action of the lead screw mechanism, piston 9, and inner brake block 12, ultimately achieving braking or deceleration. At this time, the axial force of the motor shaft 6 points to the right in the direction of the drive motor 2, and the axial force is ultimately applied to the motor protective housing 1.

[0022] Operating State Two: During normal driving (without braking or deceleration), the brake components do not operate, and piston 9 remains in the relaxed state before the brake is released. At this time, the axial force of motor shaft 6 points to the left towards piston 9, and is ultimately applied to brake caliper 8.

[0023] Operating State 3: While parked, after the start-up brake is applied and the vehicle stops, the power is cut off. Due to the self-locking function of the lead screw, piston 9 remains in the pressed state after the brake is applied. At this time, the axial force of motor shaft 6 points to the right in the direction of drive motor 2, and the axial force is ultimately applied to motor protective housing 1.

[0024] The above embodiments are merely illustrative of the design principles and uses of this utility model, and are not intended to limit this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A coaxial direct-drive electric braking system, comprising a motor protective housing, a motor, an electronic control module, a motor support body, and bolts, wherein the motor and the electronic control module are both arranged on the motor support body, the motor protective housing is arranged around the motor and the electronic control module, and the motor support body is arranged at the rear end of the motor protective housing and connected to the motor protective housing by bolts, characterized in that, It also includes calipers, piston chambers, pistons, caliper mounting brackets, motor shafts, axial thrust bearing assemblies, inner brake blocks, outer brake blocks, guide devices, and spring buffer devices; The caliper is mounted on a caliper mounting bracket. The caliper includes a caliper body and a caliper gripper. The caliper body and the caliper gripper are fixed together. The overall structure of the caliper gripper is L-shaped, and the piston chamber is arranged inside the caliper body. One end of the piston is arranged inside the piston chamber, and the other end of the piston is in contact with the inner brake block. The piston can push the inner brake block to move. The axial thrust bearing assembly is arranged at the front end of the motor protective housing. The motor shaft passes through the axial thrust bearing assembly. One end of the motor shaft is connected to the motor, and the other end of the motor shaft is connected to the piston through a screw and nut structure. The outer brake block is positioned inside the caliper grip, and the positions and structures of the outer and inner brake blocks are matched. The guiding device connects the caliper, the caliper mounting bracket, the inner brake block, and the outer brake block, and is used to guide the movement of the inner brake block. The spring buffer device is arranged between the inner brake block and the outer brake block.

2. The coaxial direct-drive electric braking system according to claim 1, characterized in that... The guiding device includes a first guide post, a second guide post, a first guide post damping spring, a second guide post damping spring, a first guide post mounting hole, and a second guide post mounting hole. The caliper mounting bracket has a U-shaped structure. The middle parts of the first guide post and the second guide post are fixed to the two sides of the caliper mounting bracket, respectively. The first guide post mounting hole and the second guide post mounting hole are respectively arranged on both sides of the caliper body. One end of the first guide post passes through the first guide post damping spring and is placed in the first guide post mounting hole. One end of the second guide post passes through the second guide post damping spring and is placed in the second guide post mounting hole. The other end of the first guide post passes through the same side of the inner brake block and the outer brake block in sequence. The other end of the second guide post passes through the other side of the inner brake block and the outer brake block in sequence.

3. The coaxial direct-drive electric braking system according to claim 2, characterized in that... The piston chamber and the piston itself are both circular in cross-section, and the piston is equipped with a sealing device.

4. The coaxial direct-drive electric braking system according to claim 3, characterized in that... The axial thrust bearing assembly consists of a thrust plate fixed on the motor shaft and left and right planar bearings.

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