Structure for preventing caliper piston dust cover from falling off

Abstract

The utility model relates to a structure for preventing a caliper piston dust cover from falling off, and belongs to the technical field of automobile braking systems. The piston is in sliding connection with the caliper body, the periphery of the piston is sleeved with a sealing ring, the end opening of the piston abuts against the brake block component, an inner ring of the piston dust cover is assembled in a groove of the piston in an interference fit mode, the inner side of an outer ring of the piston dust cover is assembled in a groove of the caliper body in an interference fit mode, and the piston check ring is tightly attached outside the inner ring, making contact with the piston, of the piston dust cover. The piston dust cover has the advantages that the structure is novel, the check ring is additionally arranged outside the piston dust cover, the structure of the piston dust cover is improved, the inner circle of the piston dust cover is changed into a protruding design to form a closed circular contact line, and the outer circle of the piston dust cover is changed into a right-angle plane design, so that the check ring is firmly attached to the piston dust cover; therefore, the piston and the built-in sealing ring are better protected from being damaged, the good braking performance of the vehicle is guaranteed, and the safety of the vehicle is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive braking systems, and particularly relates to a structure for preventing the dust cover of a caliper piston from falling off. Background Art

[0002] The piston dust cover is a crucial part in the brake. Its main functions are, firstly, to prevent external impurities such as dust, sediment, and moisture from entering the gap of the piston, and secondly, to protect the piston and the built-in sealing ring from damage, thereby improving the reliability and safety of the brake and extending the service life of the brake. In a service brake (such as Figure 4 ), first, the piston 2 is slidably connected to the caliper body 1. A sealing ring 3 is sleeved on the outer periphery of the piston 2. The port of the piston 2 abuts against the brake block assembly 5. The inner ring of the piston dust cover 4 is press-fitted on the piston 2 and the outer ring is press-fitted on the caliper body 1 to form a complete protection structure. When pressure is applied to the piston, the piston moves forward, pushing the brake block assembly forward to clamp the brake disc 8. The inner ring of the dust cover moves forward with the piston and plays a role in dust prevention and protection for the piston, realizing vehicle braking. During the pressurization process, as the piston moves forward, due to the installation and cooperation between the piston dust cover and the caliper body opening, after the piston dust cover is installed into the caliper body opening, due to the elasticity of the rubber, the piston dust cover has a tendency to rebound outward, which may lead to the problem of improper installation of the piston dust cover. Moreover, when the cooperation between the caliper body opening and the piston dust cover is loose, the piston dust cover may also slide. It can be seen that the currently used piston dust cover structure (such as Figure 5 ) is very prone to risks such as loosening, falling off, and improper installation. Once the piston dust cover is not firmly fixed, dust or sediment and other impurities will enter the piston gap, scratching the built-in sealing ring 3, resulting in piston jamming or even oil leakage, causing the brake to fail and directly affecting the safety and reliability of the vehicle. Summary of the Invention

[0003] The utility model provides a structure for preventing the dust cover of a caliper piston from falling off, so as to solve the problem of safety risks brought to vehicle braking due to loosening, falling off, and improper installation of the piston dust cover of the service brake.

[0004] The technical solution adopted by the utility model includes a caliper body, a piston, a sealing ring, a piston dust cover, a brake block assembly, and a piston retaining ring. The piston is slidably connected to the caliper body. A sealing ring is sleeved on the outer periphery of the piston. The port of the piston abuts against the brake block assembly. The inner ring of the piston dust cover is press-fitted in the groove of the piston, and the inner side of the outer ring is press-fitted in the groove of the caliper body. The piston retaining ring closely adheres to the outer side of the inner ring of the piston dust cover that contacts the piston.

[0005] There are protrusions on the inner circular surface of the piston dust cover that contacts the caliper body.

[0006] The inner circular surface of the piston dust cover in contact with the piston has protrusions.

[0007] The included angle between the outer circular surface and the bottom surface of the piston dust cover in contact with the piston retaining ring is a right angle.

[0008] The clamp body retaining ring closely adheres to the outer ring of the piston dust cover in contact with the clamp body.

[0009] The included angle between the outer circular surface and the bottom surface of the piston dust cover in contact with the clamp body retaining ring is a right angle.

[0010] The advantages of the present utility model are novel structure. A retaining ring is added outside the piston dust cover, and the structure of the piston dust cover is improved. The inner circle of the piston dust cover is changed to a convex design to form a closed circular contact line, which relies on elastic deformation to fill the unevenness on the sealing line, eliminates the gaps between the piston dust cover, the piston and the clamp body, achieves a good sealing effect, and prevents impurities such as dust and sediment from entering the interior of the parts. The outer circle of the piston dust cover is changed to a right-angle plane design, which is beneficial for the retaining ring to firmly adhere to the piston dust cover and is respectively firmly pressed into the grooves of the clamp body and the piston, preventing the piston dust cover from sliding, loosening and falling off. This structure enhances the dust-proof property of the piston dust cover and can better protect the internal parts, effectively preventing dust, sediment and other impurities from entering the side wall of the piston, thereby better protecting the piston and the built-in sealing ring from damage, and thus ensuring the good braking performance of the vehicle and greatly improving the safety of the vehicle. Description of the Drawings

[0011] Figure 1 is the structural schematic diagram of the present utility model;

[0012] Figure 2 is Figure 1 the enlarged view of part A of

[0013] Figure 3 is the structural schematic diagram of the piston dust cover of the present utility model;

[0014] Figure 4 is the assembly schematic diagram of the current clamp body, piston, sealing ring, piston dust cover, brake block component and brake disc;

[0015] Figure 5 is the structural schematic diagram of the currently used piston dust cover. Detailed Implementation Modes

[0016] It includes a caliper body 1, a piston 2, a sealing ring 3, a piston dust cover 4, a brake block assembly 5, and a piston retaining ring 6. The piston 2 is slidably connected to the caliper body 1. A sealing ring 3 is sleeved on the outer periphery of the piston 2. The port of the piston 2 abuts against the brake block assembly 5. The inner ring of the piston dust cover 4 is press-fitted into the groove of the piston 2, and the inner side of the outer ring is press-fitted into the groove of the caliper body 1. The piston retaining ring 6 closely adheres to the outer side of the inner ring of the piston dust cover 4 that contacts the piston, playing a fastening role.

[0017] There are protrusions 401 on the inner circular surface of the piston dust cover 4 that contacts the caliper body 1.

[0018] There are protrusions 402 on the inner circular surface of the piston dust cover 4 that contacts the piston 2.

[0019] The included angle 403 between the outer circular surface and the bottom surface of the piston dust cover 4 that contacts the piston retaining ring 6 is a right angle.

[0020] The caliper retaining ring 7 closely adheres to the outer ring of the piston dust cover 4 that contacts the caliper body, playing a fastening role.

[0021] The included angle 404 between the outer circular surface and the bottom surface of the piston dust cover 4 that contacts the caliper retaining ring 7 is a right angle.

[0022] Working principle

[0023] Add a retaining ring outside the piston dust cover and improve the structure of the piston dust cover. The retaining ring closely adheres to the piston dust cover, playing a fastening role, which can effectively prevent the piston dust cover from loosening and falling off, ensuring that the piston dust cover can be accurately and firmly installed on the brake caliper body and the piston. When the piston makes a reciprocating motion, the retaining ring can fasten the piston dust cover to the piston, and the gap between the piston dust cover and the caliper body, ensuring the stability of the piston dust cover, enhancing the dust-proof performance of the piston dust cover, better protecting the piston and the internal sealing ring from damage, thereby improving the safety performance of the brake and extending the service life of the brake;

[0024] Improve the inner circle of the piston dust cover into a convex shape to form a closed circular contact line, relying on elastic deformation to fill the unevenness on the sealing line, eliminating the gap with the caliper body and the piston and forming a line contact seal, improving the sealing performance of the product, preventing impurities such as dust and sand from entering the side wall of the piston, and enhancing the dust-proof effect of the piston dust cover;

[0025] Change the outer circle into a right-angled plane shape, which can make the assembly of the retaining ring more convenient and easy, and make the retaining ring firmly adhere to the piston dust cover, making the piston dust cover more stable, strengthening the protection function of the internal parts, improving the braking performance of the vehicle, and ensuring the safety of the vehicle.

Claims

1. A structure for preventing the dust cover of a caliper piston from falling off, characterized in that: It includes a clamp body, a piston, a sealing ring, a piston dust cover, a brake block component, and a piston retaining ring. The piston is slidably connected to the clamp body, a sealing ring is sleeved on the outer periphery of the piston, the piston port abuts against the brake block component, the inner ring of the piston dust cover is press-fitted into the groove of the piston, and the inner side of the outer ring is press-fitted into the groove of the clamp body. The piston retaining ring closely adheres to the outside of the inner ring of the piston dust cover that contacts the piston.

2. The structure for preventing the dust cover of the caliper piston from falling off according to claim 1, wherein: There are protrusions on the inner circular surface of the piston dust cover that contacts the clamp body.

3. A structure for preventing the dust cover of a caliper piston from falling off according to claim 1, characterized in that: There are protrusions on the inner circular surface of the piston dust cover that contacts the piston.

4. A structure for preventing the dust cover of a caliper piston from falling off according to claim 1, characterized in that: The included angle between the outer circular surface and the bottom surface of the piston dust cover that contacts the piston retaining ring is a right angle.

5. The structure for preventing the dust cover of the caliper piston from falling off according to claim 1, wherein: The clamp body retaining ring closely adheres to the outer ring of the piston dust cover that contacts the clamp body.

6. A structure for preventing the dust cover of a caliper piston from falling off according to claim 5, characterized in that: The included angle between the outer circular surface and the bottom surface of the piston dust cover that contacts the clamp body retaining ring is a right angle.

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