Self-draining seal structure of brake master cylinder

Abstract

The utility model relates to brake master cylinder technical field especially a kind of self-bleeding seal structure of brake master cylinder, including cylinder body, piston and liquid storage pot, the upper part of cylinder body outer wall is fixedly connected with liquid storage pot, the inside of cylinder body is fixed with working cavity, the piston is slidably arranged in working cavity, the front end of the piston is fixedly installed with main seal ring, the rear end of the piston is fixedly sleeved with return spring.The self-bleeding seal structure of brake master cylinder, the self-bleeding seal structure of brake master cylinder automatically discharges the air in brake master cylinder in each brake cycle, does not influence normal oil supplement function, and significantly improves the security and response speed of system, and the element such as synthetic rubber and stainless steel spring ball valve resistant to brake fluid corrosion can be used on self-bleeding seal structure material, small in size, little influence to existing brake master cylinder structure, convenient for popularization and application.

Description

Technical Field

[0001] This utility model relates to the field of brake master cylinder technology, specifically to a self-venting sealing structure for a brake master cylinder. Background Technology

[0002] The master cylinder is the core component of a car's hydraulic braking system. Its function is to convert the mechanical force of the driver pressing the brake pedal into hydraulic pressure, and then transmit the pressure to the brakes of each wheel through the brake lines to achieve deceleration and stopping. Traditional master cylinders usually include components such as cylinder, piston assembly, and reservoir.

[0003] In actual use and maintenance, a small amount of air may remain or be generated in the brake master cylinder. Current technology generally removes the air by manually bleeding the screw, but the process is cumbersome and air bubbles may still remain if not handled carefully, causing the brake pedal to become soft and the braking response to be sluggish, which affects driving safety. Especially when the master cylinder structure is poorly designed, air in some high points or blind spots cannot escape on its own and needs to be repeatedly bleed, which is both time-consuming and affects the braking effect. Utility Model Content

[0004] The purpose of this invention is to solve the problem that a small amount of air may remain or be generated in the existing brake master cylinder. The existing technology generally removes the air by manually bleeding the screw, but the process is cumbersome and air bubbles may still remain if not handled carefully, resulting in a soft brake pedal, sluggish braking response, and affecting driving safety. Therefore, a self-venting sealing structure for the brake master cylinder is proposed.

[0005] To achieve the above objectives, this utility model provides the following technical solution: Design a self-venting sealing structure for a brake master cylinder, including a cylinder, a piston, and a reservoir. The reservoir is fixedly connected to the upper part of the outer wall of the cylinder. A working chamber is fixedly opened on the inner side of the cylinder. The piston is slidably disposed inside the working chamber. A main sealing ring is fixedly installed at the front end of the piston, and a return spring is fixedly sleeved at the rear end of the piston.

[0006] In this configuration, a working chamber is formed inside the cylinder, and an oil replenishment channel communicating with the reservoir is provided on the upper part of the cylinder. The piston is slidably sealed and installed in the working chamber. The piston is equipped with a main sealing ring for pushing the brake fluid and a return spring for returning to its original position.

[0007] Preferably, the lower end of the liquid storage vessel is fixedly connected to an oil replenishment channel, and the bottom end of the oil replenishment channel is connected to the interior of the working chamber.

[0008] This feature allows the oil replenishment channel to connect the reservoir and the working chamber.

[0009] Preferably, the other end of the return spring abuts against the rear end of the cylinder, and the outer wall of the main sealing ring forms a hydraulic seal with the inner wall of the working chamber.

[0010] With this feature, the return spring can push the main sealing ring to return to its original position, thus sealing the inner wall of the working chamber.

[0011] Preferably, a small vent hole is fixedly provided at the top of the working chamber, and a thin pipe is fixedly connected to the top of the vent hole. The top of the thin pipe is connected to the upper space of the liquid storage tank, and a one-way vent valve is fixedly installed inside the thin pipe.

[0012] In this setting, the pressure inside the working chamber is close to the atmospheric pressure of the reservoir when the piston is in the initial state or when it is reset. At this time, the one-way exhaust valve is in the open state. If there is air in the working chamber, the air will rise and gather above the working chamber due to its lower density, and flow into the air space above the reservoir through the exhaust hole and the one-way exhaust valve to achieve automatic exhaust.

[0013] Preferably, an exhaust valve is fixedly installed at the top of the oil replenishment channel.

[0014] In this setting, the exhaust valve is selected as a one-way valve, which opens from the working chamber to the reservoir. The one-way exhaust valve can adopt a miniature spring ball valve structure. When the pressure in the working chamber is low or there is air, the valve is in the open state, allowing air to rise and be discharged into the reservoir through the channel. When the brake pedal is pressed and hydraulic pressure is generated, the valve is closed under pressure, ensuring that the brake fluid will not leak back into the reservoir from the channel.

[0015] Preferably, a sealing sleeve is fixedly installed on the inner front end of the cylinder, and the inner wall of the sealing sleeve is slidably connected to the piston.

[0016] This feature, the sealing sleeve, is used to reduce leakage at the cylinder connection points.

[0017] Preferably, a limiting seat is fixedly sleeved on the outer wall of the piston, and the outer wall of the limiting seat is movably connected to the rear side of the return spring.

[0018] This feature allows the limit seat to lock the rear of the return spring, preventing the spring from dislodging from the piston.

[0019] The self-venting sealing structure of the brake master cylinder proposed in this utility model has the following advantages: the self-venting sealing structure of the brake master cylinder automatically vents the air in the brake master cylinder during each braking cycle, without affecting the normal oil replenishment function, and significantly improves the safety and response speed of the system. The self-venting sealing structure can be made of materials such as synthetic rubber resistant to brake fluid corrosion and stainless steel spring ball valves. It is small in size and has little impact on the existing brake master cylinder structure, making it easy to promote and apply. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 for Figure 1 A frontal sectional view; Figure 3 for Figure 1 Top view diagram; Figure 4 for Figure 2 Enlarged diagram of part A in the middle; Figure 5 for Figure 2 Enlarged diagram of part B in the middle.

[0021] In the diagram: 10. Cylinder block, 11. Working chamber, 12. Oil replenishment channel, 13. Exhaust hole, 14. Thin pipe, 20. Piston, 21. Main seal ring, 22. Return spring, 30. Liquid reservoir, 40. One-way exhaust valve, 50. Limit seat, 60. Exhaust valve, 70. Sealing sleeve. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings: Example: Please refer to Figure 1-5 In this embodiment, a self-venting sealing structure for a brake master cylinder includes a cylinder 10, a piston 20, and a reservoir 30. The reservoir 30 is fixedly connected to the upper part of the outer wall of the cylinder 10. A working chamber 11 is fixedly opened on the inner side of the cylinder 10. The piston 20 is slidably disposed inside the working chamber 11. A main sealing ring 21 is fixedly installed at the front end of the piston 20. A return spring 22 is fixedly sleeved at the rear end of the piston 20. The working chamber 11 is formed inside the cylinder 10. An oil replenishment channel 12 communicating with the reservoir 3 is provided on the upper part of the cylinder 10. The piston 20 is slidably and sealingly installed in the working chamber 11. The piston 20 is provided with a main sealing ring 21 for pushing brake fluid and a return spring 22 for returning to its original position.

[0023] The lower end of the liquid reservoir 30 is fixedly connected to the oil replenishment channel 12, and the bottom end of the oil replenishment channel 12 is connected to the interior of the working chamber 11.

[0024] The other end of the return spring 22 abuts against the rear end of the cylinder 10, and the outer wall of the main sealing ring 21 forms a hydraulic seal with the inner wall of the working chamber 11.

[0025] The top of the working chamber 11 is fixedly provided with a small vent hole 13, and the top of the vent hole 13 is fixedly connected to a thin pipe 14. The top of the thin pipe 14 is connected to the upper space of the liquid storage tank 30, and a one-way vent valve 40 is fixedly installed inside the thin pipe 14.

[0026] In the initial state or when piston 20 is reset, the pressure in working chamber 11 is close to the atmospheric pressure of reservoir 3. At this time, one-way vent valve 40 is open. If there is air in working chamber 11, the air will rise and accumulate above the working chamber 11 due to its lower density, and flow into the air space above reservoir 30 through vent hole 13 and one-way vent valve 40 to achieve automatic venting. When the driver presses the brake pedal, piston 20 moves forward to pressurize the liquid, and the hydraulic pressure in working chamber 11 rises rapidly. One-way vent valve 40 closes rapidly under pressure, ensuring that working chamber 11 forms a closed high-pressure chamber, and effectively outputs hydraulic pressure to each wheel brake through the brake line. During the braking process, the valve is closed and there is no liquid leakage, ensuring braking efficiency.

[0027] After the pedal is released, the return spring 22 pushes the piston 20 back to its original position, the pressure in the working chamber 11 drops and returns to normal pressure, at which point the one-way exhaust valve 40 reopens, allowing newly generated or residual bubbles to be discharged.

[0028] An exhaust valve 60 is fixedly installed at the top of the oil replenishment channel 12.

[0029] The exhaust valve 60 is selected as a one-way valve, and its opening direction is from the working chamber to the reservoir. The one-way exhaust valve can adopt a miniature spring ball valve structure. When the pressure in the working chamber 11 is low or there is air, the valve is in the open state, allowing air to rise and be discharged into the reservoir 30 through the channel. When the brake pedal is pressed and hydraulic pressure is generated, the valve is closed under pressure, ensuring that the brake fluid will not leak back into the reservoir 30 from the channel.

[0030] A sealing sleeve 70 is fixedly installed on the inner front end of the cylinder body 10. The inner wall of the sealing sleeve 70 is slidably connected to the piston 20. The sealing sleeve 70 is made of rubber to reduce leakage at the cylinder body connection position.

[0031] The outer wall of the piston 20 is fixedly sleeved with a limiting seat 50. The outer wall of the limiting seat 50 is movably connected to the rear side of the return spring 22. The limiting seat 50 can lock the rear side of the return spring 22 to prevent the return spring 22 from dislodging from the piston 20.

[0032] Working principle: The brake master cylinder has a self-venting sealing structure. The brake master cylinder is the core component of the automotive hydraulic braking system. Its function is to convert the mechanical force of the driver pressing the brake pedal into hydraulic pressure, and then transmit the pressure to the brakes of each wheel through the brake lines to achieve deceleration and stopping. When the brake pedal is pressed, the piston moves forward in the cylinder, closes the oil filler hole and compresses the fluid to generate braking pressure. When the pedal is released, the piston returns to its original position and draws brake fluid from the reservoir through the oil filler hole to replenish the pipeline volume. In the initial state or when piston 20 is reset, the pressure in working chamber 11 is close to the atmospheric pressure of reservoir 3. At this time, one-way exhaust valve 40 is open. If there is air in working chamber 11, the air will rise and accumulate above the working chamber 11 due to its lower density, and flow into the air space above reservoir 30 through exhaust hole 13 and one-way exhaust valve 40 to achieve automatic exhaust. When the driver presses the brake pedal, piston 20 moves forward to pressurize the liquid. The hydraulic pressure in working chamber 11 rises rapidly. One-way exhaust valve 40 closes rapidly under pressure to ensure that working chamber 11 forms a closed high-pressure chamber. The hydraulic pressure is effectively output to each wheel brake through the brake line. The valve is closed during the braking process to prevent liquid leakage and ensure braking efficiency. After the pedal is released, return spring 22 pushes piston 20 back to its original position. The pressure in working chamber 11 drops and returns to normal pressure. At this time, one-way exhaust valve 40 reopens, allowing newly generated or residual bubbles to be discharged. The exhaust valve 60 is selected as a one-way valve, and its opening direction is from the working chamber to the reservoir. The one-way exhaust valve can adopt a miniature spring ball valve structure. When the pressure in the working chamber 11 is low or there is air, the valve is in the open state, allowing air to rise and be discharged into the reservoir 30 through the channel. When the brake pedal is pressed and hydraulic pressure is generated, the valve is closed under pressure, ensuring that the brake fluid will not leak back into the reservoir 30 from the channel. The self-venting seal structure of the brake master cylinder automatically vents air from the brake master cylinder during each braking cycle, without affecting the normal oil replenishment function, and significantly improves the safety and response speed of the system. The self-venting seal structure can be made of materials such as synthetic rubber resistant to brake fluid corrosion and stainless steel spring ball valves. It is compact in size and has little impact on the existing brake master cylinder structure, making it easy to promote and apply. Meanwhile, the self-venting sealing structure of the brake master cylinder can reduce the venting process during use, improve the reliability of the brake system after filling with fluid; avoid braking delay or weakness caused by air, and improve braking response performance; and allow tiny air bubbles to be eliminated on their own during long-term use, reducing the frequency of maintenance.

[0033] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A self-venting sealing structure for a brake master cylinder, comprising a cylinder (10), a piston (20), and a reservoir (30), wherein the reservoir (30) is fixedly connected to the upper part of the outer wall of the cylinder (10), characterized in that: The cylinder (10) has a working chamber (11) fixedly opened on the inner side. The piston (20) is slidably disposed inside the working chamber (11). The front end of the piston (20) is fixedly installed with a main sealing ring (21), and the rear end of the piston (2) is fixedly sleeved with a return spring (22).

2. The self-venting sealing structure of the brake master cylinder according to claim 1, characterized in that: The lower end of the liquid storage vessel (30) is fixedly connected to an oil replenishment channel (12), and the bottom end of the oil replenishment channel (12) is connected to the interior of the working chamber (11).

3. The self-venting sealing structure of the brake master cylinder according to claim 1, characterized in that: The other end of the return spring (22) abuts against the rear end of the cylinder (10), and the outer wall of the main sealing ring (21) forms a hydraulic seal with the inner wall of the working chamber (11).

4. The self-venting sealing structure of the brake master cylinder according to claim 1, characterized in that: The top of the working chamber (11) is fixedly provided with an exhaust hole (13), and the top of the exhaust hole (13) is fixedly connected to a thin pipe (14). The top of the thin pipe (14) is connected to the upper space of the liquid storage tank (30), and a one-way exhaust valve (40) is fixedly installed inside the thin pipe (14).

5. The self-venting sealing structure of the brake master cylinder according to claim 2, characterized in that: An exhaust valve (60) is fixedly installed at the top of the oil replenishment channel (12).

6. The self-venting sealing structure of the brake master cylinder according to claim 1, characterized in that: A sealing sleeve (70) is fixedly installed on the inner front end of the cylinder (10), and the inner wall of the sealing sleeve (70) is slidably connected to the piston (20).

7. The self-venting sealing structure of the brake master cylinder according to claim 1, characterized in that: The outer wall of the piston (20) is fixedly sleeved with a limiting seat (50), and the outer wall of the limiting seat (50) is movably connected to the rear side of the return spring (22).

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