Automobile rear wheel brake caliper

Abstract

The utility model discloses automobile rear wheel brake caliper, including caliper body, the symmetrical cavity of being provided with in caliper body inside, brake assembly, brake assembly includes the piston of sliding setting in the inside of cavity, and the one end of piston extends the cavity and is provided with brake part, the fixed setting of cavity inside is provided with sealing washer, and the outer wall of sealing washer and the lateral wall of cavity sealed cooperation, and the inside of sealing washer is provided with the guide groove, and the end of piston is provided with the guide ring of protruding from its body away from brake part, and the guide ring is embedded in the guide groove and with guide groove sliding sealed cooperation. The utility model discloses through with sealing washer fixed setting in caliper cavity inner wall, and adopts the interference fit mode to realize the static sealing between it and caliper body, avoids the deviation, stretching and deformation problem of traditional structure because sealing washer moves with piston, thereby effectively prevents brake fluid leakage, improved the sealing stability and security of whole brake system.

Description

Technical Field

[0001] This utility model belongs to the field of automotive component technology, and in particular relates to automotive rear wheel brake calipers. Background Technology

[0002] Brake calipers are widely used in vehicles. The rear wheels of a car generate braking force through the interaction between the brake caliper and the brake disc. In traditional designs, a sealing ring is usually fitted onto the outer wall of the piston. This sealing ring slides back and forth within the caliper cavity along with the piston to seal the brake fluid. However, this design has the following problems:

[0003] Because the sealing ring moves with the piston, it is prone to failure due to stretching, deformation, displacement or wear during long-term use, resulting in brake fluid leakage and affecting the stability and safety of the braking system. Utility Model Content

[0004] This utility model addresses the problems in the prior art by proposing the following technical solution:

[0005] This utility model provides a rear wheel brake caliper for automobiles, comprising:

[0006] The caliper body has symmetrically arranged cavities inside.

[0007] A braking assembly, the braking assembly including a piston slidably disposed inside a cavity, one end of the piston extending out of the cavity and provided with a braking element;

[0008] A sealing ring is fixedly installed inside the cavity. The outer wall of the sealing ring is sealed to the side wall of the cavity. The piston is located inside the sealing ring. A guide groove is provided inside the sealing ring. A guide ring protruding from the piston body is provided at the end of the piston away from the braking component. The guide ring is embedded in the guide groove and slides and seals with the guide groove.

[0009] As a preferred embodiment of the above technical solution, a contact portion is provided on the contact surface of the guide groove that slides with the guide ring.

[0010] As a preferred embodiment of the above technical solution, a plurality of locking blocks are provided on the outer side wall of the sealing ring, and a locking groove is provided on the caliper body corresponding to the locking block position to cooperate with it, and the locking block is embedded in the locking groove.

[0011] As a preferred embodiment of the above technical solution, a spring is also provided between the caliper body and the braking component to connect the two.

[0012] The beneficial effects of this utility model are as follows:

[0013] This invention achieves a static seal between the sealing ring and the caliper body by fixing the sealing ring to the inner wall of the caliper cavity and using an interference fit. The inner side of the sealing ring is provided with a guide groove, and the piston end is provided with a guide ring. The two slide together to form a dynamic sealing structure, so that wear is mainly concentrated on the contact surface between the guide ring and the guide groove, making the wear uniform and controllable. This avoids the problems of displacement, stretching and deformation caused by the movement of the sealing ring with the piston in traditional structures, thereby effectively preventing brake fluid leakage and improving the sealing stability and safety of the entire braking system. Attached Figure Description

[0014] Figure 1 The diagram shown is a cross-sectional view of the brake caliper in the embodiment;

[0015] Figure 2 What is shown is Figure 1 Enlarged schematic diagram of the structure at point A in the diagram;

[0016] Reference numerals: 10, caliper body; 20, cavity; 30, piston; 31, brake element; 32, guide ring; 40, sealing ring; 41, guide groove; 42, contact part; 43, locking block; 50, spring. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0018] Example

[0019] like Figure 1 , Figure 2 As shown, Figure 1 The diagram shown is a cross-sectional view of the brake caliper in the embodiment. Figure 2 What is shown is Figure 1 Enlarged schematic diagram of the structure at point A in the diagram;

[0020] This device includes:

[0021] The caliper body 10 has symmetrically arranged cavities 20 inside.

[0022] The braking assembly includes a piston 30 that is slidably disposed inside a cavity 20, with one end of the piston 30 extending out of the cavity 20 and provided with a braking element 31.

[0023] The cavity 20 is connected to the master cylinder via a hydraulic circuit, receiving hydraulic pressure from the pedal. The brake fluid pressure can push the piston 30 to move outward, causing the brake element 31 to press tightly against the brake disc, generating braking torque, and slowing down or stopping the wheels.

[0024] A sealing ring 40 is fixedly installed inside the cavity 20. The outer wall of the sealing ring 40 is sealed to the side wall of the cavity 20. The piston 30 is located inside the sealing ring 40. A guide groove 41 is provided inside the sealing ring 40. A guide ring 32 protruding from the piston body is provided at the end of the piston 30 away from the brake 31. The guide ring 32 is embedded in the guide groove 41 and slides and seals with the guide groove 41.

[0025] Specifically, the sealing ring 40 is usually made of a high-temperature resistant, oil-resistant, and elastic material, such as fluororubber (FKM) or silicone rubber. The sealing ring 40 and the caliper body 10 are interference fit, which can provide good static sealing performance and prevent brake fluid leakage. The fit between the guide groove 41 and the guide ring 32 can play a guiding and limiting role when the piston 30 reciprocates.

[0026] In the above structure, the sealing surface of the fixed sealing ring 40 remains unchanged, which ensures the stability of the sealing surface and avoids leakage caused by the displacement of the sealing ring 40 due to the movement of the piston 30. This static sealing design helps to improve the overall sealing performance.

[0027] The wear of the sealing ring 40 is mainly concentrated on the sliding contact surface between the guide ring 32 and the guide groove 41, which can extend the service life of the sealing ring 40 and the piston 30.

[0028] A contact portion 42 is provided on the contact surface of the guide groove 41 that slides with the guide ring 32.

[0029] The contact part 42 is a wear-resistant pad, and the guide ring 32 is a wear-resistant part (both can be PTFE composite materials), so that the wear between the two is uniform and controllable.

[0030] Several locking blocks 43 are provided on the outer side wall of the sealing ring 40. The caliper body 10 has a locking groove corresponding to the locking block 43, and the locking block 43 is embedded in the locking groove.

[0031] After the card block 43 is inserted into the card slot, it restricts the circumferential rotation and axial movement of the sealing ring 40 within the cavity 20.

[0032] A spring 50 is also provided between the caliper body 10 and the brake component 31 to connect the two.

[0033] One end of the spring 50 is fixedly connected to the caliper body 10, and the other end is fixedly connected to the brake component 31.

[0034] When the driver releases the brake pedal, the brake fluid pressure drops. At this time, the spring 50 helps to pull the piston 30 back to its original position, ensuring that the brake element 31 is separated from the brake disc, reducing drag, and avoiding unnecessary fuel consumption and wear.

[0035] Working principle: When the driver presses the brake pedal, the master cylinder injects brake fluid into the chamber 20 through the hydraulic oil circuit, increasing the hydraulic pressure in the chamber 20. The piston 30 is pushed outward by the hydraulic pressure. The guide ring 32 on the piston 30 slides along the guide groove 41 inside the sealing ring 40 to ensure the piston 30 moves in a straight line and prevents it from deviating. The movement of the piston 30 makes the brake element 31 press tightly against the brake disc. The friction between the two causes the wheel to decelerate or stop rotating, thereby achieving vehicle braking.

[0036] The sealing ring 40 is fixed in place, and a static seal is achieved between its outer wall and the cavity 20. The piston 30 slides inside the sealing ring 40, and a dynamic seal is formed between the guide groove 41 and the guide ring 32. The fixed sealing surface design avoids sealing failure caused by the movement of the piston 30. The wear of the sealing ring 40 is concentrated on the sliding surface of the guide ring 32 and the guide groove 41, which does not affect the main sealing function.

[0037] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A rear wheel brake caliper for automobiles, characterized in that, include: The caliper body (10) has symmetrically arranged cavities (20) inside; A braking assembly, the braking assembly including a piston (30) slidably disposed inside a cavity (20), one end of the piston (30) extending out of the cavity (20) and provided with a braking element (31); A sealing ring (40) is fixedly installed inside the cavity (20). The outer wall of the sealing ring (40) is sealed to the side wall of the cavity (20). The piston (30) is located inside the sealing ring (40). A guide groove (41) is provided inside the sealing ring (40). A guide ring (32) protruding from the piston (30) is provided at the end of the piston (30) away from the brake (31). The guide ring (32) is embedded in the guide groove (41) and slides and seals with the guide groove (41).

2. The automotive rear wheel brake caliper according to claim 1, characterized in that, A contact portion (42) is provided on the contact surface of the guide groove (41) that slides with the guide ring (32).

3. The automotive rear wheel brake caliper according to claim 2, characterized in that, The outer wall of the sealing ring (40) is provided with a plurality of locking blocks (43), and the caliper body (10) is provided with a locking groove corresponding to the locking block (43), and the locking block (43) is embedded in the locking groove.

4. The automotive rear wheel brake caliper according to claim 3, characterized in that, A spring (50) is also provided between the caliper body (10) and the brake element (31) to connect the two.

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