A reservoir structure for clutch and brake master cylinders

Abstract

This utility model relates to the field of brake pumps and discloses a reservoir structure for a clutch and brake master cylinder, including a reservoir cap (1). A port (2) is located in the middle of the upper part of the reservoir cap (1), communicating with the internal space of the reservoir cap (1). A raised retaining ring (3) is arranged around the port (2), and a waterproof, oil-proof, and breathable membrane (4) is fixedly covered on the retaining ring (3). The membrane (4) completely covers the upper part of the port (2). A sleeve (5) is arranged around the lower part of the port (2), and a base plate (6) with an air hole (7) is arranged at the bottom of the sleeve (5). The air hole (7) communicates with the interior of the port (2) and with the internal space of the reservoir cap (1). This reservoir structure has advantages such as long service life and no brake fluid leakage.

Description

Technical Field

[0001] This utility model relates to the field of vehicle brake master cylinders, and in particular to a reservoir structure for a clutch and brake master cylinder. Background Technology

[0002] like Figure 1 The diagram shows a common brake fluid reservoir structure, which uses gaps in the diaphragm to allow the fluid to breathe. A drawback of current products is that when the vehicle travels over bumpy roads, some brake fluid may leak through the gaps in the diaphragm due to splashing caused by the movement of the reservoir. Over time, this can lead to abnormal brake fluid consumption, affecting the normal use and maintenance of the vehicle and increasing operating costs. Utility Model Content

[0003] This utility model addresses the shortcomings of existing technologies by providing an oil reservoir structure for the clutch and brake master cylinder.

[0004] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method:

[0005] A reservoir structure for a clutch / brake master cylinder includes an oil cup cover. The upper cover of the oil cup cover has an opening in the middle, which communicates with the internal space of the oil cup cover. A raised retaining ring is provided around the opening. A waterproof, oil-proof, and breathable membrane is fixedly covered on the retaining ring, completely covering the opening. A sleeve is provided around the lower part of the opening. The bottom of the sleeve is provided with a base plate with air holes, which communicate with the interior of the opening and the internal space of the oil cup cover.

[0006] Preferably, an airway tube is provided on the upper part of the base plate, and the air holes completely penetrate the airway tube.

[0007] Preferably, the top cover has an assembly step around the fixing ring and also includes an oil cup cap, which covers the assembly step, and the height of the assembly step is lower than the height of the fixing ring.

[0008] Preferably, the upper part of the base plate is provided with an air passage, the side wall of the air passage is provided with an exhaust port, the top of the air passage is a sealed structure, the inside of the air passage is provided with a vertical air path, the lower end of the air path is connected to the air hole, and the side wall is connected to the exhaust port.

[0009] Preferably, the sleeve and the oil cup cover are separate structures, with the sleeve sealed and installed on the inner wall of the opening.

[0010] Compared with existing technologies, this solution has the following advantages: The oil reservoir structure, through the inclusion of a breather hole and a breather diaphragm, prevents brake fluid leakage and extends its service life. Furthermore, the addition of a side vent structure allows it to adapt to complex operating conditions and high air pressure scenarios, ensuring the cleanliness of the breather diaphragm and extending its service life. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the existing technology structure.

[0012] Figure 2 This is a schematic diagram of the structure of Example 1.

[0013] Figure 3 This is a schematic diagram of the structure of Example 2.

[0014] The technical names of the reference numerals in the figure are: 1—oil cup cover, 2—mouth one, 3—fixing ring, 4—diaphragm one, 5—sleeve body, 6—base plate, 7—air hole, 8—air pipe, 10—assembly step, 11—exhaust port, 12—air passage. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0016] Example 1

[0017] A master cylinder reservoir structure for clutches and brakes includes a reservoir cap 1. A port 2 is located in the center of the upper part of the reservoir cap 1, communicating with the internal space of the reservoir cap 1. A raised retaining ring 3 surrounds the port 2, and a waterproof, oil-proof, and breathable membrane 4 is fixedly fitted onto the retaining ring 3, completely covering the port 2. A sleeve 5 is located around the lower part of the port 2, and a base plate 6 with an air vent 7 is located at the bottom of the sleeve 5. The air vent 7 communicates with the interior of the port 2 and the internal space of the reservoir cap 1. In use, the reservoir cap 1 is fitted onto the reservoir, typically secured with a threaded connection. Under normal circumstances, there is a certain distance between the brake fluid level line and the air vent 7. When the vehicle is bumpy, brake fluid may enter the air vent 7, but will return to the reservoir under gravity.

[0018] Specifically, in this embodiment, an air duct is provided on the upper part of the base plate 6, and the air hole 7 completely penetrates the air duct. The longer air pipe 9 can trap a portion of the brake fluid in the gas, reducing its impact on the waterproof and breathable membrane.

[0019] The upper cover has an assembly step 10 around the fixing ring 3, and also includes an oil cup cap 13, which covers the assembly step 10. The height of the assembly step 10 is lower than the height of the fixing ring 3.

[0020] During operation, when the pedal and piston return to their original positions, a certain degree of vacuum is created in the pressure-building chamber due to the viscous resistance of the fluid. Under the action of the pressure difference, the fluid supply chamber pushes open the one-way valve or piston gasket formed by the piston cup and the inner wall of the cylinder to replenish the fluid to the pressure-building chamber. At this time, some fluid in the fluid reservoir will flow into the fluid supply chamber, and the air pressure in the fluid reservoir will decrease. Atmospheric air enters the fluid reservoir through diaphragm 4 to replenish the internal and external air pressure balance. After the brake fluid returns from the brake caliper, the excess fluid in the pressure-building chamber returns to the rear chamber and fluid reservoir through the compensation hole or inlet valve. At this time, the air pressure inside the fluid reservoir will increase. Then, the excess gas is discharged through diaphragm 4 to balance the internal and external air pressure.

[0021] Compared with existing technologies, this solution has the following advantages: The oil reservoir structure, through the inclusion of a breather hole and a breather diaphragm, prevents brake fluid leakage and extends its service life. Furthermore, the addition of a side vent structure allows it to adapt to complex operating conditions and high air pressure scenarios, ensuring the cleanliness of the breather diaphragm and extending its service life.

[0022] Example 2

[0023] Based on the design of Example 1, this example features the following design differences: an air duct is provided on the upper part of the base plate 6, and an exhaust port 11 is provided on the side wall of the air duct 9. The top of the air duct is a sealed structure, and a vertical air passage 12 is provided inside the air duct. The lower end of the air passage 12 is connected to the air hole 7, and the side wall is connected to the exhaust port 11. This modification from upward exhaust breathing to side-entry and exhaust breathing increases the selection of airflow channels, adding redundancy. Furthermore, the air duct design prevents high-velocity, high-pressure gas from directly impacting the membrane 4 section above, thus avoiding affecting its lifespan.

[0024] To facilitate cleaning and collection of brake fluid accumulated inside the sleeve 5 over a long period of time, the sleeve 5 and the oil cup cap 1 are separate structures, with the sleeve 5 sealed and installed on the inner wall of the port 2.

Claims

1. A reservoir structure for a clutch and brake master cylinder, characterized in that: The oil cup cover (1) includes an opening (2) in the middle of the top cover of the oil cup cover (1). The opening (2) is connected to the internal space of the oil cup cover (1). A raised fixing ring (3) is provided around the opening (2). A waterproof, oil-proof and breathable membrane (4) is fixedly covered on the fixing ring (3). The membrane (4) completely covers the top of the opening (2). A sleeve (5) is provided around the lower part of the opening (2). A bottom plate (6) with an air hole (7) is provided at the bottom of the sleeve (5). The air hole (7) is connected to the inside of the opening (2) and is connected to the internal space of the oil cup cover (1).

2. The oil reservoir structure of a clutch and brake master cylinder according to claim 1, characterized in that: An airway tube is provided on the upper part of the base plate (6), and the air hole (7) completely penetrates the airway tube.

3. The oil reservoir structure of a clutch and brake master cylinder according to claim 1, characterized in that: The top cover has an assembly step (10) around the fixing ring (3) and also includes an oil cup cap (13), which covers the assembly step (10). The height of the assembly step (10) is lower than the height of the fixing ring (3).

4. The oil reservoir structure of a clutch and brake master cylinder according to claim 1, characterized in that: An air passage is provided on the upper part of the base plate (6), and an exhaust port (11) is provided on the side wall of the air passage (9). The top of the air passage is a sealed structure, and a vertical air passage (12) is provided inside the air passage. The lower end of the air passage (12) is connected to the air hole (7), and the side wall is connected to the exhaust port (11).

5. The oil reservoir structure of a clutch and brake master cylinder according to claim 1, characterized in that: The sleeve (5) and the oil cup cover (1) are separate structures, and the sleeve (5) is sealed and installed on the inner wall of the opening (2).

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