Brake cylinder with longer service life

Abstract

The utility model relates to a brake cylinder with longer service life, which comprises a cylinder body, a piston arranged in a cylinder hole of the cylinder body and a leather cup arranged at the inner end of the piston, and is characterized in that a boss is arranged at the inner end of the piston, an anti-attrition gasket is sleeved on the boss in a matching manner, the leather cup is positioned on the inner side of the anti-attrition gasket, an inclined fracture is arranged on the anti-attrition gasket, and the inclined fracture is matched with the piston. The anti-attrition gasket is broken through the oblique fracture, a first oblique fracture end face and a second oblique fracture end face are formed on the anti-attrition gasket, the first oblique fracture end face and the second oblique fracture end face are arranged in a face-to-face mode, and the first oblique fracture end face and the second oblique fracture end face are pressed to be arranged in a mutual extrusion mode. Wherein the anti-attrition gasket with the inclined fracture is additionally arranged, when the pressure in the cylinder body is increased, the anti-attrition gasket can be enlarged to shield the gap between the piston and the cylinder body, the leather cup is protected, the situation that the leather cup is squeezed into the gap between the piston and the cylinder body due to the influence of the pressure is avoided, and therefore abrasion of the leather cup can be reduced, and the service life of the leather cup can be prolonged; the durability of the leather cup is improved.

Description

Technical Field

[0001] The utility model relates to a brake slave cylinder. Background Art

[0002] For a brake slave cylinder, such as the brake slave cylinder of CN221704265U, a piston is arranged in a cylinder bore of a cylinder block. A leather cup is arranged at an end of the piston and is matched with an inner wall of the cylinder bore. During operation of the piston, a lip of the leather cup can be matched with the inner wall of the cylinder bore for sealing. During the pressure inlet process, the piston moves inwards, the pressure in the cylinder block becomes larger, and the lip of the leather cup will be squeezed into a gap between the cylinder bore of the cylinder block and the piston. Over time, the leather cup will be damaged, the wear of the leather cup will be aggravated, and the service life of the entire brake slave cylinder will be affected. In addition, during the reciprocating operation of the piston in the cylinder bore of the cylinder block, the piston and the inner wall of the cylinder bore will rub against each other. When impurities remain in the brake fluid, the friction and wear between the piston and the cylinder bore will be aggravated, affecting the service life. Content of the Utility Model

[0003] In view of the technical problems existing in the background art, the utility model aims to provide a brake slave cylinder with better service life.

[0004] To solve the above technical problems, the utility model adopts the following technical solutions: A brake slave cylinder with better service life, including a cylinder block, a piston is arranged in the cylinder bore of the cylinder block, and a leather cup is further arranged at an inner end of the piston. The characteristics are that: a boss is arranged at the inner end of the piston, an anti-friction washer is sleeved on the boss in a matching manner, the leather cup is located on the inner side of the anti-friction washer, and an inclined break is further arranged on the anti-friction washer. The inclined break disconnects the anti-friction washer and forms a first inclined break end face and a second inclined break end face on the anti-friction washer. The first inclined break end face and the second inclined break end face are arranged face to face, and the first inclined break end face and the second inclined break end face are arranged to be mutually pressed.

[0005] The following various optimizations or supplementary explanations can be further carried out on the above technical solutions respectively.

[0006] For example, both the first inclined break end face and the second inclined break end face are inclined planes. Among them, the first inclined break end face and the second inclined break end face are arranged to be mutually parallel.

[0007] Among them, the side of the anti-friction washer facing the leather cup is a pressure-receiving surface.

[0008] For example, the anti-friction washer can be made of polytetrafluoroethylene.

[0009] Among them, the outer ring of the piston is in sliding fit with the cylinder bore of the cylinder block, and even a impurity-storing and anti-friction groove ring for residual impurities of the brake fluid can be arranged on the outer ring of the piston.

[0010] Among them, the impurity-storing and anti-friction groove ring is centered on the axis of the piston, and at least one impurity-storing and anti-friction groove ring is arranged.

[0011] Among them, the pistons are respectively arranged on the left and right parts of the cylinder holes of the cylinder block, and a spreading return spring is arranged between the left and right pistons.

[0012] Among them, a spring seat is arranged on the inner side of the leather cup, the spreading return spring is located between the spring seats, the spring seats are located on the inner side of the leather cup, and the pistons and wear-reducing washers are located on the outer side of the leather cup.

[0013] The beneficial effect of the present utility model is that for the brake cylinder with better service life, a wear-reducing washer with an inclined fracture is added. When the pressure in the cylinder block increases, the wear-reducing washer can expand to block the gap between the piston and the cylinder block, protecting the leather cup and preventing the leather cup from being squeezed into the gap between the piston and the cylinder block under the influence of pressure, thereby reducing the wear of the leather cup, prolonging the life of the leather cup, and improving the durability of the leather cup. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following describes the embodiments, relevant details and working principles of the present utility model with reference to the accompanying drawings.

[0015] Figure 1 It is a schematic structural diagram of the present utility model.

[0016] Figure 2 is Figure 1 a schematic structural diagram of the wear-reducing washer on the right side in

[0017] Figure 3 is Figure 2 a schematic structural diagram in the A direction in

[0018] In the figure:

[0019] 1. Cylinder block; 10. Cylinder hole;

[0020] 2. Piston; 20. Boss; 21. Debris storage wear-reducing groove ring;

[0021] 3. Leather cup;

[0022] 4. Wear-reducing washer; 40. Inclined fracture; 41. First inclined fracture end face; 42. Second inclined fracture end face; 43. Compressed surface;

[0023] 5. Spreading return spring;

[0024] 6. Spring seat. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model; obviously, the described embodiments are only a part of the embodiments of the implementation manner of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] Referring to the attached drawings, in the embodiment of this implementation manner, a brake caliper with better service life includes a cylinder block 1. A piston 2 is arranged in the cylinder bore 10 of the cylinder block 1. A leather cup 3 is also provided at the inner end of the piston 2. This is a mature technology.

[0027] Wherein, a boss 20 is provided at the inner end of the piston 2. A wear-reducing washer 4 is sleeved on the boss 20 in a matching manner. The leather cup 3 is located inside the wear-reducing washer 4. The annular structure of the wear-reducing washer 4 can be sleeved on the boss 20 and is blocked and installed in a matching manner by the leather cup 3 at the inner side position; Figure 1 For the piston 2 on the left, the right side is the inner side, and for the piston 2 on the right, the left side is the inner side, that is, the middle position of the cylinder block 1 is relatively inward.

[0028] Wherein, an inclined fracture 40 is also provided on the wear-reducing washer 4. The inclined fracture 40 disconnects the entire annular structure of the wear-reducing washer 4. It can be disconnected by means such as an inclined cut with a single knife. The inclined direction refers to a direction different from the axial and radial directions of the wear-reducing washer 4.

[0029] Wherein, the inclined fracture 40 disconnects the wear-reducing washer 4 and forms a first inclined fracture end face 41 and a second inclined fracture end face 42 on the wear-reducing washer 4. The two ends of the wear-reducing washer 4 at the inclined fracture 40 are exactly the first inclined fracture end face 41 and the second inclined fracture end face 42, and the first inclined fracture end face 41 and the second inclined fracture end face 42 are arranged face to face; in addition, due to the inclined direction of the inclined port, and the first inclined fracture end face 41 and the second inclined fracture end face 42 are arranged to be pressed against each other, when the pressure in the cylinder block 1 becomes larger (such as during the pressure building process), the wear-reducing washer 4 bears the inner pressure. The first inclined fracture end face 41 and the second inclined fracture end face 42 of the wear-reducing washer 4 are pressed against each other, so that the diameter (slightly) of the wear-reducing washer 4 becomes larger, just blocking the outside of the leather cup 3, preventing the leather cup 3 from being squeezed into the gap between the piston 2 and the inner wall of the cylinder block 1 by the inner pressure, protecting the leather cup 3, reducing the wear of the leather cup 3, and prolonging the life of the leather cup 3; after the pressure in the cylinder block 1 drops, the diameter of the wear-reducing washer 4 becomes smaller and returns to its original state. In addition, the protection of the leather cup 3 by the wear-reducing washer 4 also reduces the requirements for the machining accuracy of the inner wall of the cylinder bore 10 of the cylinder block 1 and the piston 2. The gap between the piston 2 and the inner wall of the cylinder block 1 does not need to be limited by the influence of the leather cup 3 protection.

[0030] For this brake caliper with better service life, a wear-reducing washer 4 with an inclined fracture 40 is added. When the pressure in the cylinder block 1 becomes larger, the wear-reducing washer 4 can become larger to block the gap between the piston 2 and the cylinder block 1, protecting the leather cup 3 and preventing the leather cup 3 from being squeezed into the gap between the piston 2 and the cylinder block 1 under the influence of pressure. Therefore, the wear of the leather cup 3 can be reduced, the life of the leather cup 3 can be prolonged, and the durability of the leather cup 3 can be improved.

[0031] Based on the above embodiments respectively, the following optimizations or further explanations can also be carried out.

[0032] For example, the first oblique end face 41 and the second oblique end face 42 are both oblique planes. When the first oblique end face 41 and the second oblique end face 42 cooperate with each other, the oblique planes are squeezed against each other and can slide smoothly away from each other, thereby smoothly expanding the friction-reducing washer 4 and increasing its diameter.

[0033] It can be further optimized that the first oblique end surface 41 and the second oblique end surface 42 are arranged parallel to each other.

[0034] The side of the friction-reducing washer 4 facing the leather cup 3 is a pressure surface 43, and the (brake fluid) pressure in the cylinder 1 can act on the friction-reducing washer 4. For example, the friction-reducing washer 4 is made of polytetrafluoroethylene (PTFE).

[0035] The outer ring of the piston 2 is slidably matched with the cylinder hole 10 of the cylinder body 1, that is, the piston 2 is matched to run axially in the cylinder body 1, and the outer ring (that is, the outer ring wall) of the piston 2 is also provided with a storage groove ring 21 for residual impurities in the brake fluid. During operation, the impurities remaining in the brake fluid will be accumulated in the storage groove ring 21 of the piston 2 to reduce wear, so that the wear degree of the cylinder hole 10 is greatly reduced, and the service life is improved. The storage groove ring 21 is centered on the axis of the piston 2, and at least one storage groove ring 21 is provided, which can be provided according to needs.

[0036] Among them, the piston 2 is respectively arranged on the left and right parts of the cylinder hole 10 of the cylinder body 1, and the left and right pistons 2 are provided with a return spring 5 in front. The return spring 5 is used to separate and retract the pistons 2 when the pressure in the cylinder body 1 drops. This is a mature technology. In addition, a spring seat 6 is provided on the inner side of the leather cup 3 (relatively in the center of the pump body), and the return spring 5 is located between the (left and right) spring seats 6; the spring seat 6 is located on the inner side of the leather cup 3, and the piston 2 and the anti-friction washer 4 are located on the outer side of the leather cup 3. In this structure, the leather cup 3 is relatively simple to assemble and is not easily damaged during the assembly operation, resulting in usage problems. The leather cup 3 does not need to be sleeved on the piston 2, and only the spring seat 6 is pressed under the action of the return spring 5, thereby forming a structure in which the cup is clamped between the spring seat 6 and the piston 2 and the anti-friction washer 4.

Claims

1. Brake cylinder with better service life, including a cylinder block (1), a piston (2) is arranged in the cylinder bore (10) of the cylinder block (1), and a leather cup (3) is further arranged at the inner end of the piston (2), and it is characterized in that: A boss (20) is provided at the inner end of the piston (2). An anti-friction washer (4) is sleeved on the boss (20) in a mating manner. The leather cup (3) is located inside the anti-friction washer (4). An inclined fracture (40) is also provided on the anti-friction washer (4). The inclined fracture (40) disconnects the anti-friction washer (4) and forms a first inclined fracture end face (41) and a second inclined fracture end face (42) on the anti-friction washer (4). The first inclined fracture end face (41) and the second inclined fracture end face (42) are arranged face to face. The first inclined fracture end face (41) and the second inclined fracture end face (42) are arranged to be pressed against each other under pressure.

2. The brake slave cylinder with better service life according to claim 1, wherein: Both the first inclined fracture end face (41) and the second inclined fracture end face (42) are inclined planes.

3. The brake slave cylinder with better service life according to claim 1, characterized in that: The first inclined fracture end face (41) and the second inclined fracture end face (42) are arranged parallel to each other.

4. The brake caliper with better service life according to claim 1, characterized in that: The side surface of the anti-friction washer (4) facing the leather cup (3) is the pressure-receiving surface (43).

5. The brake caliper with better service life according to claim 1, characterized in that: The anti-friction washer (4) is made of polytetrafluoroethylene.

6. The brake caliper with better service life according to claim 1, wherein: The outer ring of the piston (2) is in sliding fit with the cylinder bore (10) of the cylinder block (1). A debris storage and anti-friction groove ring (21) for residual brake fluid impurities is also provided on the outer ring of the piston (2).

7. The brake caliper with better service life according to claim 6, characterized in that: The debris storage and anti-friction groove ring (21) is centered on the axis of the piston (2), and at least one debris storage and anti-friction groove ring (21) is provided.

8. The brake caliper with better service life according to claim 1, wherein: The pistons (2) are respectively arranged at the left and right parts of the cylinder bore (10) of the cylinder block (1). A spreading and return spring (5) is provided between the left and right pistons (2).

9. The brake slave cylinder with better service life according to claim 8, characterized in that: A spring seat (6) is provided inside the leather cup (3). The spreading and return spring (5) is located between the spring seats (6). The spring seats (6) are located inside the leather cup (3). The piston (2) and the anti-friction washer (4) are located outside the leather cup (3).

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