Brake master cylinder with residual pressure valve structure

Abstract

The utility model relates to a brake master cylinder with a residual pressure valve structure, a residual pressure valve comprises an annular sealing piece, an annular valve seat, a valve core, a spring seat and a valve closing spring, the annular sealing piece is arranged on the rear side of a brake fluid inlet and outlet hole, the rear side of the annular valve seat is provided with a spring connecting part for being connected with a main spring, the valve core penetrates through a valve channel, and the spring seat is connected with the valve closing spring. The front end of the valve element is provided with a first sealing matching part, the rear end of the valve element is connected with the spring seat, the annular sealing piece is provided with a second sealing matching part which is in valve sealing fit with the first sealing matching part, and the valve closing spring is arranged between the annular valve seat and the spring seat. During braking, the residual pressure valve is quickly opened, brake fluid can be quickly and effectively transmitted to a pipeline, and the brake wheel cylinder plays a role in braking; after braking is completed, certain residual brake fluid and residual (liquid) pressure exist in a pipeline and a brake wheel cylinder, and braking can be conducted more rapidly and effectively in the next time or during continuous braking.

Description

Technical Field

[0001] The utility model relates to a brake master cylinder with a residual pressure valve structure. Background Art

[0002] The master cylinder is used to activate and release the brakes. During pressure buildup, it transfers brake fluid (i.e., oil) to the lines and wheel cylinders to activate the brakes. When the master cylinder releases pressure to release the brakes, the fluid returns to the cylinder, releasing the brakes. After pressure relief, re-applying the brakes requires re-building pressure in the lines and wheel cylinders. Rapid and efficient pressure buildup ensures timely and effective braking, ensuring effective braking and greater safety. Utility Model Content

[0003] In view of the technical problems existing in the background technology, the present invention aims to provide a brake master cylinder with a residual pressure valve structure that can quickly and effectively transfer brake fluid for braking.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: a brake master cylinder with a residual pressure valve structure, including a cylinder body, a residual pressure valve, a main spring and a piston are provided in the cylinder hole of the cylinder body, the main spring is arranged between the residual pressure valve and the piston, a brake fluid inlet and outlet hole is provided on the cylinder body, and the brake fluid inlet and outlet hole is located at the bottom of the cylinder hole, which is characterized in that: the residual pressure valve includes an annular seal, an annular valve seat, a valve core, a spring seat and a valve closing spring, the annular seal is arranged on the rear side of the brake fluid inlet and outlet hole, the front part of the annular seal has an annular sealing portion, and the annular sealing portion is arranged on the cylinder body. On the rear side of the dynamic liquid inlet and outlet hole, the annular seal is arranged on the front side of the annular valve seat. The rear side of the annular valve seat has a spring connecting portion for connecting the main spring. The middle of the annular seal and the annular valve seat is a valve channel. The valve core passes through the valve channel. The front end of the valve core has a first sealing matching portion. The rear end of the valve core is connected to the spring seat. The annular seal has a second sealing matching portion. The first sealing matching portion is arranged on the front side of the second sealing matching portion. The valve closing spring is arranged between the annular valve seat and the spring seat. The first sealing matching portion and the second sealing matching portion are valve-sealably matched with each other.

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

[0006] The annular seal may be made of rubber; in addition, a first axial liquid-passing groove is provided on the outer ring wall of the annular seal and / or the annular valve seat.

[0007] For example, the annular valve seat is made of metal integral stamping parts, and the spring seat is made of metal integral stamping parts, such as metal materials such as stainless steel.

[0008] Among them, the annular valve seat also has a spring-limiting inward flanging, and the enclosed middle hole of the spring-limiting inward flanging is the valve passage of the annular valve seat; the annular valve seat also has a spring-limiting outer groove; the annular valve seat also has an assembly-limiting step for connecting and arranging the annular seal.

[0009] Among them, the spring seat is provided with a connection hole, and the valve core is riveted to the connection hole, so the connection is firmer and it is not easy to fall off during operation; the edge of the spring seat is a spring-limiting outward flanging; the spring seat is also provided with a liquid-passing through hole.

[0010] Furthermore, the valve core has a guiding part passing through the valve passage of the annular valve seat, and a second axial liquid-passing groove is also arranged at the guiding part.

[0011] The beneficial effects of the present utility model are as follows. When the master brake cylinder with the residual pressure valve structure brakes, the residual pressure valve is quickly opened, and the brake fluid can be quickly and effectively transmitted to the pipeline and the brake wheel cylinder to achieve the braking effect; after braking, the master brake cylinder is depressurized, and the brake fluid in the pipeline and the brake wheel cylinder flows back to the cylinder block of the master brake cylinder. During the process of the brake fluid returning to the cylinder block of the master brake cylinder, the hydraulic pressure (pressure) at the output end of the brake fluid inlet and outlet hole (i.e., in the pipeline and the brake wheel cylinder) gradually becomes smaller. When the hydraulic pressure (pressure) in the pipeline and the brake wheel cylinder is less than the elastic force of the main spring, the annular hole-sealing and sealing part and the brake fluid inlet and outlet hole are in a sealed state again. After the pressure in the cylinder block (liquid) is depressurized, it cannot overcome the elastic force of the valve-closing spring and cannot push the valve core open, and the residual pressure valve is in a closed state. At this time, there is a certain amount of residual brake fluid and residual (liquid) pressure in the pipeline and the brake wheel cylinder, and it can brake more quickly and effectively during the next or continuous braking. Moreover, the residual pressure valve operates relatively stably, the opening and closing switching is stable, and the failure risk is relatively low. Description of the Drawings

[0012] The following describes the implementation manners, relevant details and working principles of the embodiments of the present utility model in conjunction with the drawings.

[0013] Figure 1 It is a structural schematic diagram of the present utility model.

[0014] Figure 2 It is Figure 1 a structural schematic diagram of the residual pressure valve in

[0015] Figure 3 It is Figure 2 a structural schematic diagram of the valve core in

[0016] Figure 4 It is Figure 3 a structural schematic diagram in the A direction in

[0017] Figure 5 It is Figure 2 a side view of the spring seat in

[0018] In the figure:

[0019] 1. Cylinder block; 10. Cylinder bore; 11. Brake fluid inlet / outlet hole;

[0020] 2. Residual pressure valve; 20. Annular seal; 21. Annular valve seat; 22. Valve core; 23. Spring seat; 24. Valve closing spring; 25. Valve passage; 26. First axial liquid passing groove;

[0021] 201. Annular hole sealing and sealing part; 202. Second sealing and mating part;

[0022] 211. Spring connection part; 212. Spring limiting inward flanging; 213. Spring limiting outer groove; 214. Assembly limiting step;

[0023] 221. First sealing and mating part; 222. Guide part; 223. Second axial liquid passing groove; 224. Riveting joint;

[0024] 231. Connection hole; 232. Spring limiting outward flanging; 233. Liquid passing through hole;

[0025] 3. Main spring;

[0026] 4. Piston. Detailed implementation mode

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with 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 mode of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present utility model.

[0028] Referring to the accompanying drawings, in the embodiments of this implementation mode, the master brake cylinder with a residual pressure valve structure includes a cylinder block 1. A residual pressure valve 2, a main spring 3 and a piston 4 are arranged in the cylinder bore 10 of the cylinder block 1. The main spring 3 is arranged between the residual pressure valve 2 and the piston 4. A brake fluid inlet / outlet hole 11 is provided on the cylinder block 1, and the brake fluid inlet / outlet hole 11 is located at the bottom ( Figure 1 in the left position in the figure) of the cylinder bore 10. The brake fluid inlet / outlet hole 11 is for brake fluid to enter and exit the cylinder block 1 to the pipeline and the brake wheel cylinder.

[0029] Among them, the residual pressure valve 2 includes an annular seal 20, an annular valve seat 21, a valve core 22, a spring seat 23 and a valve closing spring 24.

[0030] The annular seal 20 is arranged at the rear side of the brake fluid inlet / outlet hole 11 ( Figure 1The annular seal 20 has an annular hole sealing portion 201 at the front, and the annular hole sealing portion 201 is arranged on the rear side of the brake fluid inlet and outlet hole 11. The annular hole sealing portion 201 of the annular seal 20 can cooperate to seal the brake fluid inlet and outlet hole 11.

[0031] The annular seal 20 is provided on the front side of the annular valve seat 21 ( Figure 1 The annular valve seat 21 can support the annular seal 20; the rear side of the annular valve seat 21 ( Figure 1 The main spring 3 (right side in the center) has a spring connection portion 211 for connection to the main spring 3. One end of the main spring 3 is connected to the spring connection portion 211 of the annular valve seat 21, and the other end of the main spring 3 is connected to the piston 4. The main spring 3 provides a spring force to the residual pressure valve 2, causing it to move toward the brake fluid inlet and outlet 11.

[0032] The middle of the annular seal 20 and the annular valve seat 21 is a valve channel 25. The channel in the middle of the annular seal 20 and the channel in the middle of the annular valve seat 21 form the valve channel 25 of the residual pressure valve 2. The valve core 22 passes through the valve channel 25, that is, the front end of the valve core 22 and the rear end of the valve core 22 are just arranged in front and behind the valve channel 25 respectively; the front end of the valve core 22 has a first sealing fitting portion 221, and the rear end of the valve core 22 is connected to the spring seat 23. The annular seal 20 has a second sealing fitting portion 202. The first sealing fitting portion 221 is arranged at On the front side of the second sealing fitting part 202, the valve closing spring 24 is arranged between the annular valve seat 21 and the spring seat 23. The first sealing fitting part 221 and the second sealing fitting part 202 are valve-sealed with each other (used to close the residual pressure valve 2). The valve closing spring 24 is used to cooperate in closing the residual pressure valve 2. The valve closing spring 24 separates the annular valve seat 21 and the spring seat 23 from each other. The valve closing spring 24 makes the first sealing fitting part 221 and the second sealing fitting part 202 close to each other to form a valve seal (i.e., closing the residual pressure valve 2), and the brake fluid will not flow out or in.

[0033] Its working principle and effect are as follows: when the brake master cylinder with residual pressure valve structure is braked, the piston 4 moves inward and begins to build pressure, the (liquid) pressure in the cylinder 1 increases, and the pressure overcomes the elastic force of the valve closing spring 24 to push the valve core 22 open, so that the valve core 22 moves forward ( Figure 1 The first sealing part 221 and the second sealing part 202 are separated and the sealing state is released (the residual pressure valve 2 is opened). The residual pressure valve 2 is quickly opened, and the brake fluid can be quickly and effectively transferred to the pipeline and the brake wheel cylinder to achieve the braking effect. After the braking is completed, the brake master cylinder is depressurized, and the brake fluid in the pipeline and the brake wheel cylinder flows back to the cylinder body 1 of the brake master cylinder, and overcomes the main spring 3 to push the annular seal 20 open ( Figure 1When moving to the right in the figure, the annular hole-sealing seal 201 and the brake fluid inlet / outlet hole 11 are released from the sealed state, and the braking is cancelled. During the process of the brake fluid returning to the cylinder block 1 of the master cylinder, the hydraulic pressure (pressure) at the output end of the brake fluid inlet / outlet hole 11 (i.e., in the pipeline and the brake wheel cylinder) gradually decreases. When the hydraulic pressure (pressure) in the pipeline and the brake wheel cylinder is less than the elastic force of the main spring 3, the annular hole-sealing seal 201 and the brake fluid inlet / outlet hole 11 are again in the sealed state. After the pressure in the cylinder block 1 (liquid) is relieved, it cannot overcome the elastic force of the valve-closing spring 24 and cannot push the valve core 22 open, and the residual pressure valve 2 is in the closed state. At this time, there is a certain amount of residual brake fluid and residual (liquid) pressure in the pipeline and the brake wheel cylinder, and more rapid and effective braking can be achieved during the next or continuous braking.

[0034] Based on the above embodiments respectively, the following optimizations or further explanations can be made.

[0035] For example, the annular seal 20 is made of rubber material, which is relatively common and has good avoidance effect. In addition, a first axial liquid-passing groove 26 is provided on the outer circumferential wall of the annular seal 20 and / or the annular valve seat 21. The first axial liquid-passing groove 26 can be uniformly arranged on the outer circumferential wall. When the brake fluid returns to the cylinder block 1 during pressure relief braking, the brake fluid can not only flow back through the gap between the annular seal 20 / annular valve seat 21 and the cylinder block 1, but also flow back quickly through the first axial liquid-passing groove 26.

[0036] Among them, the annular valve seat 21 can be made of a metal integral stamping part, and the spring seat 23 can be made of a metal integral stamping part. The processing technology is relatively mature and the processing is relatively convenient.

[0037] For example, the annular valve seat 21 has a spring-limiting inner flanging 212, and the enclosed middle hole of the spring-limiting inner flanging 212 is the valve passage 25 of the annular valve seat 21 (the valve passage 25 of the annular valve seat 21), which has better guiding performance. The annular valve seat 21 has a spring-limiting outer groove 213, and the annular valve seat 21 also has an assembly-limiting step 214 for connecting and arranging the annular seal 20. One end of the valve-closing spring 24 can be limited by the spring-limiting inner flanging 212, and the closing spring runs relatively stably. One end of the main spring 3 can be limited by the spring-limiting outer groove 213, and the main spring 3 runs relatively stably. The annular seal 20 can be assembled in cooperation with the assembly-limiting step 214, and the relative position is stable. In addition, a connecting hole 231 is provided on the spring seat 23, and the valve core 22 is riveted to the connecting hole 231. In the figure, the riveting head 224 is the riveting place, and the connection stability is relatively good. The edge of the spring seat 23 is a spring-limiting outer flanging 232, and the other end of the valve-closing spring 24 can be limited by the spring-limiting inner flanging 212, and the closing spring runs relatively stably; a liquid-passing through hole 233 is also provided on the spring seat 23 to improve the brake fluid circulation efficiency. The corresponding flanging, groove, step, and hole can be formed by stamping, which is convenient for processing and manufacturing.

[0038] In addition, the valve core 22 has a guiding portion 222. The guiding portion 222 (such as guiding rib strips) of the valve core 22 passes through the valve passage 25 of the annular valve seat 21, and the valve core 22 runs more stably in the valve passage 25 by means of the guiding portion 222; even further, a second axial liquid passing groove 223 is provided at the guiding portion 222. As shown in the figure, the second axial liquid passing groove 223 divides the guiding portion 222 into three guiding rib strip structures. Not only can the brake fluid flow through the gap between the guiding portion 222 of the valve core 22 and the valve passage 25, but also the second axial liquid passing groove 223 can be used to quickly flow the brake fluid.

Claims

1. The master brake cylinder with a residual pressure valve structure includes a cylinder block (1). A residual pressure valve (2), a main spring (3), and a piston (4) are arranged in the cylinder bore (10) of the cylinder block (1). The main spring (3) is arranged between the residual pressure valve and the piston (4). A brake fluid inlet / outlet hole (11) is provided on the cylinder block (1), and the brake fluid inlet / outlet hole (11) is located at the bottom of the cylinder bore (10). It is characterized in that: The residual pressure valve (2) includes an annular seal (20), an annular valve seat (21), a valve core (22), a spring seat (23), and a valve closing spring (24). The annular seal (20) is arranged at the rear side of the brake fluid inlet / outlet hole (11). The front part of the annular seal (20) has an annular hole-sealing and sealing part (201), and the annular hole-sealing and sealing part (201) is arranged at the rear side of the brake fluid inlet / outlet hole (11). The annular seal (20) is arranged at the front side of the annular valve seat (21). The rear side of the annular valve seat (21) has a spring connection part (211) for connecting the main spring (3). A valve channel (25) is formed between the annular seal (20) and the annular valve seat (21). The valve core (22) passes through the valve channel (25). The front end of the valve core (22) has a first sealing and mating part (221), and the rear end of the valve core (22) is connected to the spring seat (23). The annular seal (20) has a second sealing and mating part (202), and the first sealing and mating part (221) is arranged at the front side of the second sealing and mating part (202). The valve closing spring (24) is arranged between the annular valve seat (21) and the spring seat (23), and the first sealing and mating part (221) and the second sealing and mating part (202) are in valve sealing and mating with each other.

2. The master brake cylinder with a residual pressure valve structure according to claim 1, characterized in that: The annular seal (20) is made of rubber material, and a first axial liquid passing groove (26) is provided on the outer circumferential wall of the annular seal (20) and / or the annular valve seat (21).

3. The master brake cylinder with a residual pressure valve structure according to claim 1, characterized in that: The annular valve seat (21) is made of a metal integral stamping part, and the spring seat (23) is made of a metal integral stamping part.

4. The master brake cylinder with a residual pressure valve structure according to claim 1, characterized in that: The annular valve seat (21) has a spring limiting inward flanging (212). The enclosed middle hole of the spring limiting inward flanging (212) is the valve channel (25) of the annular valve seat (21). The annular valve seat (21) has a spring limiting outer groove (213), and the annular valve seat (21) also has an assembly limiting step (214) for connecting and arranging the annular seal (20).

5. The master brake cylinder with a residual pressure valve structure according to claim 1, characterized in that: A connection hole (231) is provided on the spring seat (23), and the valve core (22) is riveted to the connection hole (231). The edge of the spring seat (23) is a spring limiting outward flanging (232). A liquid passing through hole (233) is also provided on the spring seat (23).

6. The master brake cylinder with a residual pressure valve structure according to claim 1, characterized in that: The valve core (22) has a guiding part (222) passing through the valve channel (25) of the annular valve seat (21), and a second axial liquid passing groove (223) is also provided at the guiding part (222).

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