A u-shaped return spring assembly applied to an EMB caliper

Abstract

The utility model discloses a U-shaped return spring assembly applied to EMB caliper. Including the elastic body of U-shaped, the elastic body one end fixed connection is in parking drive mechanism, and parking drive mechanism is installed on the mounting block, and the elastic body other end is connected to the pawl, the pawl is installed on the mounting block through the hinge mounting of mounting peg, and the mounting block is fixed on the frame. The utility model can replace the mechanical self -lock structure of parking clamping in the original EPB caliper's MGU in braking system, replace the complex self -lock nut screw structure among them, can simple parking path, promote response speed, optimize the gear etc. Mechanical structure distribution in the EMA of EMB caliper, and cancel the original bidirectional electromagnet, reduce the cost.

Description

Technical Field

[0001] This utility model relates to the field of vehicle braking system technology, and in particular to a U-shaped return spring structure for EMB (Electro-Mechanical Braking) calipers. Background Technology

[0002] Traditional EPB (Electronic Parking Brake) calipers use a mechanical self-locking structure in the MGU (Motor Gear Unit) to achieve the parking function, typically including a complex self-locking nut and screw mechanism and a two-way electromagnet. This structure has the following drawbacks: 1. Complex transmission path leads to slow response speed 2. Self-locking structures require high machining precision and are costly. 3. Large space occupation, affecting the internal layout of EMA (electromechanical actuator). 4. Electromagnets consume a relatively high amount of energy. Utility Model Content

[0003] To address the deficiencies and shortcomings in the prior art, this invention provides a U-shaped return spring assembly for EMB calipers, which solves the problems of complex structure, slow response, and high cost of traditional EMB caliper parking mechanisms.

[0004] This invention provides a U-shaped return spring, with its two ends connected to a pawl and a parking drive mechanism, respectively. The specific solution includes: I. A U-shaped return spring assembly for EMB calipers: The U-shaped return spring assembly includes a U-shaped elastic body. One end of the elastic body is fixedly connected to the parking drive mechanism, which is mounted on the mounting block. The other end of the elastic body is connected to a pawl, which is hinged to the mounting block by a mounting pin. The mounting block is fixed to the vehicle frame.

[0005] The mounting block is provided with a limiting boss, and one end of the elastic body is fixedly connected to the limiting boss. The limiting boss is used to elastically limit the travel of the pawl.

[0006] The bending radius R of the elastic body is 3-5mm, and the thickness is 1.2-2mm.

[0007] The elastic body is made of a material with similar properties, such as 65Mn or SUS304.

[0008] The parking drive mechanism includes a drive gear set connected to the motor output shaft, and a drive rod connected to the drive gear set, with the other end of the elastic body connected to the rod end of the drive rod.

[0009] II. An EMB caliper comprising the aforementioned U-shaped return spring assembly.

[0010] This invention can replace the mechanical self-locking structure of the parking clamp in the MGU of the original EPB caliper in the braking system, replacing the complex self-locking nut and screw structure, simplifying the parking path, improving response speed, optimizing the distribution of mechanical structures such as gears in the EMA of the EMB caliper, and eliminating the original bidirectional electromagnet, thus reducing costs.

[0011] In this invention, the pawl is hinged by a mounting pin, the parking drive mechanism and the pawl are mounted together on the mounting block, and the parking mechanism and the parking gear are arranged in a linkage manner.

[0012] The beneficial effects of this invention are as follows: 1) Performance optimization Response speed improved by more than 30%; Simplified parking path: Mechanical self-locking is achieved directly through the return spring-pawl mechanism, shortening the transmission chain by more than 40%; Improved dynamic response: Actual parking response time is reduced by 30-50ms compared to the traditional MGU structure; Improved torque transmission efficiency: Mechanical losses are reduced by approximately 15% after the gear system layout is optimized.

[0013] 2) Cost advantage: Optimize the internal gear layout space of the EMA; reduce the number of parts by more than 60% (approximately 25 parts in the traditional structure vs. <10 parts in this solution); eliminate high-precision screw machining (accounting for 25-30% of the original cost); savings in electromagnets and related control circuits result in a 15-20% cost reduction. The elimination of the bidirectional electromagnet reduces manufacturing costs by more than 20%.

[0014] 3) Enhanced reliability Improve the reliability of parking mechanisms; It eliminates the wear problem of threaded pairs and extends the service life to more than 100,000 cycles. The reed mechanism has a single failure mode, which facilitates fault diagnosis. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the assembly state of the U-shaped return spring of the present invention; Figure 2 A 3D diagram showing the connection relationship between the U-shaped return spring and the parking drive mechanism; Figure 3 This is a schematic diagram of the parking working state of the present invention; In the diagram: 1. Elastic body; 2. Parking drive mechanism; 3. Mounting block; 4. Pawl; 5. Mounting pin. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1 As shown, it includes a U-shaped elastic body 1. One end of the elastic body 1 is fixedly connected to the parking drive mechanism 2, which is mounted on the mounting block 3. The other end of the elastic body 1 is connected to the pawl 4, which is hinged to the mounting block 3 by a mounting pin 5. The mounting block 3 is fixed to the vehicle frame.

[0018] like Figure 2 As shown, the mounting block 3 is provided with a limiting boss, and one end of the elastic body 1 is fixedly connected to the limiting boss, thereby being fixedly connected to the mounting block 3. The limiting boss is used to elastically limit the stroke of the pawl 4.

[0019] The bending radius R of the elastic body 1 is 3-5 mm, and the thickness is 1.2-2 mm. The elastic body 1 is usually made of materials with similar properties such as 65Mn or SUS304.

[0020] The parking drive mechanism 2 includes a drive gear set connected to the motor output shaft and a drive rod connected to the drive gear set, with the other end of the elastic body 1 connected to the rod end of the drive rod.

[0021] In this invention, within the electromechanical actuator EMA, the two ends of the U-shaped return spring are respectively connected to the pawl 4 and the parking drive mechanism 2; the pawl 4 is installed by the mounting pin 5 and is installed together with the parking drive mechanism 2 on the mounting block 3; in the EMB caliper, the entire parking mechanism is connected to the parking gear to perform the parking function.

[0022] Among them, such as Figure 3 As shown, the U-shaped return spring assembly of the present invention is arranged in the EMB caliper. The motor in the parking drive mechanism 2 runs, and the motor output shaft drives the drive gear set to work, thereby driving the drive rod to move through the sleeve and connect to the root of the pawl 4, pushing the pawl 4 to swing, thereby pushing the tooth structure at the end of the pawl 4 to mesh with the gear synchronously connected on the wheel, thereby driving the wheel to stop and realizing the caliper parking function.

[0023] This invention features a U-shaped return spring assembly that bidirectionally connects the pawl and the parking drive mechanism, replacing the complex self-locking nut and screw structure in traditional EPB calipers. The integrated design of the mounting pin and mounting block enables modular assembly of the parking mechanism. The bidirectional electromagnet is eliminated, simplifying the electrical components of the braking system. The elimination of the self-locking nut and screw structure also simplifies the mechanical transmission path.

[0024] A preferred embodiment may be: 1. The U-shaped return spring is made of 65Mn spring steel, with a thickness of 1.5mm and a return angle of 15°. 2. The distance between the connection points of the pawl and the parking drive mechanism is 8-12mm. 3. The mounting block is equipped with a positioning boss, with a tolerance controlled within ±0.05mm. 4. Parking gear module 1.5, number of teeth 24 Workflow: ① When the parking command is triggered, the motor drives the parking gear to rotate; ② The pawl engages with the gear groove via a U-shaped return spring. ③ When the parking brake is released, the return spring elastically resets, causing the pawl to disengage.

[0025] The above specific embodiments are used to explain and illustrate the present invention, but not to limit the present invention. Any modifications and changes made to the present invention within the spirit and scope of the claims shall fall within the protection scope of the present invention.

[0026] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A U-shaped return spring assembly for EMB calipers, characterized in that: It includes a U-shaped elastic body (1), one end of which is fixedly connected to a parking drive mechanism (2), which is mounted on a mounting block (3), and the other end of which is connected to a pawl (4). The pawl (4) is hinged to the mounting block (3) by a mounting pin (5), and the mounting block (3) is fixed to the vehicle frame.

2. The U-shaped return spring assembly for EMB calipers according to claim 1, characterized in that: The mounting block (3) is provided with a limiting boss, and one end of the elastic body (1) is fixedly connected to the limiting boss. The limiting boss is used to elastically limit the stroke of the pawl (4).

3. A U-shaped return spring assembly for EMB calipers according to claim 1, characterized in that: The bending radius R of the elastic body (1) is 3-5 mm and the thickness is 1.2-2 mm.

4. A U-shaped return spring assembly for EMB calipers according to claim 1, characterized in that: The elastic body (1) is made of 65Mn or SUS304 material.

5. A U-shaped return spring assembly for EMB calipers according to claim 1, characterized in that: The parking drive mechanism (2) includes a drive gear set connected to the motor output shaft and a drive rod connected to the drive gear set, with the other end of the elastic body (1) connected to the rod end of the drive rod.

6. An EMB caliper, characterized in that: It includes the U-shaped return spring assembly as described in any one of claims 1-5.

Images