Parking brake with combined sealing structure

Abstract

The utility model relates to a parking brake with a combined sealing structure, and belongs to the technical field of automobile braking. The small check ring and the small sealing ring are installed in the same sealing groove in the front end of the clamp body, the small sealing ring is located on the right side of the small check ring, the large sealing ring and the large check ring are installed in the same sealing groove in the rear end of the clamp body, the large sealing ring is located on the left side of the large check ring, the front end of the piston assembly is connected with the small check ring in a penetrating mode, and the rear end of the piston assembly is connected with the large check ring in a penetrating mode. An end cover in threaded connection with the caliper body is arranged on the right side of the disc-shaped reed, the left side of the brake pad is fixedly connected with the caliper body, and the right side of the brake pad is fixedly connected with the front end of the piston assembly. The sealing device has the advantages that the structure is novel, the sealing, supporting and guiding effects can be achieved in the parking brake, the service life of a sealing piece is prolonged, the sealing performance of a product is greatly improved, meanwhile, the effect of protecting the caliper body and the main piston from being damaged is achieved, and the safety performance of a vehicle is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automotive braking, and particularly relates to a parking brake with a combined sealing structure. Background Art

[0002] The parking brake is a braking method adopted to prevent the vehicle from sliding when the vehicle is stationary. Its working principle is that when the vehicle stops, the hydraulic pressure in the sealing cavity inside the parking brake decreases, and the disc spring pushes the main piston and the brake pads to clamp the brake disc to achieve parking braking. When the vehicle is moving forward, the hydraulic pressure in the sealing cavity increases, and the hydraulic pressure pushes the main piston to compress the disc spring to make the brake pads leave the brake disc, and the parking brake is released.

[0003] The sealing ring is a crucial sealing part in the parking brake. Its main function is to form a sealing cavity in the caliper body of the parking brake and provide a safe and reliable sealing effect between the caliper body and the main piston. The existing sealing structure in the parking brake is to assemble a single sealing ring in the caliper body of the parking brake. This structure is simple and single. When a high pressure is established in the sealing cavity, the sealing ring may be squeezed and deformed, which will affect the sealing effect of the sealing cavity, reduce the service life of the sealing parts, and in severe cases, cause the hydraulic oil to leak out, making the sealing cavity ineffective, resulting in phenomena such as inability to build pressure and insufficient braking force. Summary of the Invention

[0004] The utility model provides a parking brake with a combined sealing structure to solve the problems that the single sealing ring will be squeezed and deformed, which will affect the sealing effect of the sealing cavity, reduce the service life of the sealing parts, and in severe cases, cause the hydraulic oil to leak out, making the sealing cavity ineffective, resulting in inability to build pressure and insufficient braking force.

[0005] The technical solution adopted by the utility model is that it includes a caliper body, a small retaining ring, a small sealing ring, a large retaining ring, a large sealing ring, a disc spring, a piston assembly, brake pads and an end cover. Among them, the small retaining ring and the small sealing ring are installed in the same sealing groove at the front end of the caliper body, and the small sealing ring is located on the right side of the small retaining ring. The large sealing ring and the large retaining ring are installed in the same sealing groove at the rear end of the caliper body, and the large sealing ring is located on the left side of the large retaining ring. The front end of the piston assembly is connected through the small retaining ring, and the rear end is connected through the large retaining ring. The disc spring is located on the right side of the piston assembly, and there is an end cover threadedly connected to the caliper body on the right side of the disc spring. The left side of the brake pads is fixedly connected to the caliper body, and the right side is fixedly connected to the front end of the piston assembly.

[0006] The piston assembly includes a main piston, a sub-piston and an adjusting bolt. Among them, the sub-piston and the adjusting bolt are located inside the main piston, and the adjusting bolt is threadedly connected to the main piston.

[0007] The small sealing ring and the large sealing ring respectively form a sealing cavity A with the pliers body and the main piston in the sealing grooves of each pliers body.

[0008] The advantages of the present utility model are novel structure. The sealing ring and the retaining ring are assembled together in the sealing groove of the pliers body. The sealing ring can play a sealing role between the pliers body and the main piston, prevent the hydraulic oil from leaking out, prevent the sealing ring from being extruded and deformed under the working pressure, improve the sealing performance of the product, increase the reliability of the product. The retaining ring can play a role in supporting and guiding the main piston, guiding the main piston to move in a straight line, preventing the piston from deviating during the sliding process, resulting in the risk of the pliers body and the main piston colliding and causing the braking performance to fail, avoiding problems such as internal leakage of hydraulic oil and reducing the service life of the sealing parts. This combined sealing structure has a dual-effect, greatly improving the durability, safety and reliability of the product, reducing accidents caused by braking failure, avoiding the risk of braking failure, and protecting the personal safety of the driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic structural diagram of the present utility model. DETAILED DESCRIPTION OF THE INVENTION

[0010] As Figure 1 shown, it includes a pliers body 1, a small retaining ring 2, a small sealing ring 3, a large retaining ring 4, a large sealing ring 5, a disc spring 6, a piston assembly 7, a brake pad 8 and an end cover 9. The small retaining ring 2 and the small sealing ring 3 are installed in the same sealing groove at the front end of the pliers body 1, and the small sealing ring 3 is located on the right side of the small retaining ring 2. The large sealing ring 5 and the large retaining ring 4 are installed in the same sealing groove at the rear end of the pliers body 1, and the large sealing ring 5 is located on the left side of the large retaining ring 4. The front end of the piston assembly 7 is connected through the small retaining ring 2, and the rear end is connected through the large retaining ring 4. The disc spring 6 is located on the right side of the piston assembly 7, and there is an end cover 9 threadedly connected to the pliers body 1 on the right side of the disc spring 6. The left side of the brake pad 8 is fixedly connected to the pliers body 1, and the right side is fixedly connected to the front end of the piston assembly 7.

[0011] The piston assembly 7 includes a main piston 701, a sub-piston 702 and an adjusting bolt 703. The sub-piston 702 and the adjusting bolt 703 are located in the main piston 701, and the adjusting bolt 703 is threadedly connected to the main piston 701.

[0012] The small sealing ring 3 and the large sealing ring 5 respectively form a sealing cavity A with the pliers body 1 and the main piston 701 in the sealing grooves of each pliers body.

[0013] Working Principle

[0014] When parking is achieved, the hydraulic pressure in the sealed cavity A is released, and the disc spring 6 pushes the piston assembly 7 and the brake pads 8 to clamp the brake disc to implement parking braking. When driving is achieved, hydraulic pressure is established in the sealed cavity A, and the piston assembly 7 is pushed by the hydraulic pressure to compress the disc spring 6, and the brake pads 8 are disengaged from the brake disc, and the parking braking is released at this time.

[0015] Adopting a combined sealing structure that applies the sealing ring and the retaining ring together can greatly enhance the sealing effect of the sealed cavity in the parking brake. Because the sealing ring can provide a stable sealing effect to prevent the leakage of brake fluid, and the retaining ring can prevent the sealing ring from being extruded and deformed under the working pressure effect, increasing the service life of the seal. More importantly, it plays a supporting and guiding role for the piston assembly 7, making the piston assembly 7 move in a straight line, preventing the piston assembly 7 from coming into direct contact with the caliper body 1 during the movement process or being deflected due to uneven force, improving the reliability and durability of the parking brake product, and ensuring the safety performance of the vehicle. This combined sealing structure has a dual-effect.

Claims

1. A parking brake with a combined sealing structure, characterized in that: It includes a caliper body, a small retaining ring, a small sealing ring, a large retaining ring, a large sealing ring, a disc spring, a piston assembly, a brake pad and an end cover, wherein the small retaining ring and the small sealing ring are installed in the same sealing groove at the front end of the caliper body, and the small sealing ring is located on the right side of the small retaining ring, the large sealing ring and the large retaining ring are installed in the same sealing groove at the rear end of the caliper body, and the large sealing ring is located on the left side of the large retaining ring, the front end of the piston assembly is connected with the small retaining ring, and the rear end is connected with the large retaining ring, the disc spring is located on the right side of the piston assembly, and the right side of the disc spring has an end cover threadedly connected to the caliper body, the left side of the brake pad is fixedly connected to the caliper body, and the right side is fixedly connected to the front end of the piston assembly.

2. The parking brake with a combined sealing structure according to claim 1, characterized in that: The piston assembly comprises a main piston, a secondary piston and an adjusting bolt, wherein the secondary piston and the adjusting bolt are located in the main piston, and the adjusting bolt is threadedly connected to the main piston.

3. The parking brake with a combined sealing structure according to claim 2, characterized in that: The small sealing ring and the large sealing ring are respectively in the sealing grooves of each caliper body to form a sealing cavity A with the caliper body and the main piston.

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