Waterproof screw cap component of automobile brake fluid storage tank
By combining the design of the screw cap, sealing ring and waterproof and breathable membrane, the contradiction between waterproof and breathable performance of the brake fluid reservoir screw cap component is resolved, achieving both waterproof and breathable performance under water immersion conditions. The structure is simple and low in cost.
Patent Information
- Application Number
- CN202422667230.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-03
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-03
AI Technical Summary
The existing brake fluid reservoir cap assembly has a contradiction between waterproofing and ventilation performance, and cannot meet both requirements at the same time, resulting in increased water content in the brake fluid or inability to brake normally.
The design employs a combination of a screw cap, a sealing ring, and a waterproof and breathable membrane. The sealing ring and the supporting ribs are interference-sealed, as are the screw cap and the liquid storage tank shell. This ensures gas flow but not liquid flow, achieving a balance between waterproofing and ventilation through the waterproof and breathable membrane.
It achieves water leakage prevention under water conditions while ensuring gas flow, meeting the requirements of waterproof and ventilated performance. It has a simple structure, is easy to assemble, and has low cost.
Smart Images
Figure CN223494496U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to brake fluid reservoir cap components in automotive braking systems, and more particularly to a waterproof automotive brake fluid reservoir cap component. Background Technology
[0002] The brake fluid reservoir is a key component of the automotive braking system. Its main function is to provide brake fluid to the master cylinder and brake lines, converting the fluid pressure into mechanical energy so that the car can generate braking force.
[0003] The electric vehicle industry is currently experiencing strong growth, enabling electric vehicles to operate in conditions where gasoline-powered cars cannot, such as wading through water (meaning they can still drive even when the water level is higher than the engine compartment). However, in such situations, the brake fluid reservoir cap may leak water into the reservoir due to water pressure, increasing the water content in the brake fluid and causing weak braking, or even complete loss of braking power. The brake fluid reservoir cap also needs a vent to allow brake fluid to flow out at normal atmospheric pressure. In summary, the cap has two functions: waterproofing and venting. These two properties are contradictory; satisfying one will affect the other. Therefore, it is necessary to develop products that can meet both the waterproofing and venting requirements of the cap. Summary of the Invention
[0004] This utility model provides a waterproof automotive brake fluid reservoir cap component that meets both the waterproof performance requirements and the ventilation performance requirements of the cap component.
[0005] The technical solution adopted by this utility model includes a screw cap, a sealing ring, a waterproof and breathable membrane, and a liquid storage tank shell. The top of the support rib in the screw cap has a waterproof and breathable membrane. The sealing ring is assembled inside the screw cap, and there is an interference seal between the sealing ring and the support rib. The screw cap is assembled with the liquid storage tank shell, and there is an interference seal between the sealing ring and the liquid storage tank shell.
[0006] The interference fit between the sealing ring and the groove of the cap support rib is greater than 0.2 mm.
[0007] After the sealing ring is pressed against the liquid storage tank shell, the interference fit between the sealing ring and the liquid storage tank shell is greater than 0.1 mm.
[0008] After the sealing ring is assembled with the liquid storage tank shell, the sealing ring must not block the ventilation channel of the screw cap.
[0009] The advantages of this utility model are its novel structure, consisting of a screw cap, a sealing ring, and a waterproof and breathable membrane. Gas inside and outside the liquid storage tank can flow through the air passage formed by the waterproof and breathable membrane and the groove of the screw cap, while liquid outside the liquid storage tank cannot flow through the waterproof and breathable membrane, and brake fluid inside the liquid storage tank cannot flow through the waterproof and breathable membrane either. It has few parts, is simple to assemble, is detachable, and easy to replace parts, with low investment cost. It realizes the function of allowing gas to flow through the screw cap component but not liquid to flow through it, which can meet both the waterproof performance requirements and the ventilation performance requirements of the screw cap component. Attached Figure Description
[0010] Figure 1 This is a structural schematic diagram of the present invention. In the diagram, solid arrows indicate the direction of airflow, and dashed arrows indicate the direction of liquid flow. Detailed Implementation
[0011] like Figure 1 As shown, it includes a screw cap 1, a sealing ring 2, a waterproof and breathable membrane 3, and a liquid storage tank shell 4. The screw cap 1 has a waterproof and breathable membrane 3 at the top of the support rib 101. The sealing ring 2 is assembled inside the screw cap 1, and there is an interference seal between the sealing ring 2 and the support rib 101. The sealing ring 2 is not allowed to fall off in the free state. The screw cap 1 is assembled with the liquid storage tank shell 4, and the sealing ring 2 is interference sealed with the liquid storage tank shell 4.
[0012] The interference fit between the sealing ring 201 of the sealing ring 2 and the groove 10101 of the cap support rib 101 is >0.2mm.
[0013] After the sealing ring 2 is pressed against the liquid storage tank shell 4, the interference fit between the sealing ring 2 and the liquid storage tank shell 4 is greater than 0.1 mm.
[0014] After the sealing ring 2 is assembled with the liquid storage tank shell 4, the sealing ring 2 cannot block the ventilation channel 102 of the screw cap 1.
[0015] Working principle
[0016] After the cap 1 is assembled with the liquid storage tank shell 4, the gas inside and outside the liquid storage tank can flow through the ventilation channel 102 formed by the waterproof and breathable membrane 3 and the groove of the cap 1. The liquid outside the liquid storage tank cannot flow through the waterproof and breathable membrane, and the brake fluid inside the liquid storage tank cannot flow through the waterproof and breathable membrane.
[0017] When the car is driving through water, the liquid outside the reservoir cannot enter the reservoir through the cap vent 102. When the car leaves the water, the gas inside and outside the reservoir can flow into or out of the reservoir through the cap vent 102.
Claims
1. A waterproof automotive brake fluid reservoir cap assembly, characterized in that: The device includes a screw cap, a sealing ring, a waterproof and breathable membrane, and a liquid storage tank shell. The screw cap has a waterproof and breathable membrane at the top of the support rib. The sealing ring is installed inside the screw cap and is press-fitted with the support rib. The screw cap is also assembled with the liquid storage tank shell, and the sealing ring is press-fitted with the liquid storage tank shell.
2. The waterproof automotive brake fluid reservoir cap assembly according to claim 1, characterized in that: The interference fit between the sealing ring and the groove of the cap support rib is >0.2mm.
3. The waterproof automotive brake fluid reservoir cap assembly according to claim 1, characterized in that: After the sealing ring is pressed against the liquid storage tank shell, the interference fit between the sealing ring and the liquid storage tank shell is greater than 0.1 mm.
4. The waterproof automotive brake fluid reservoir cap assembly according to claim 1, characterized in that: After the sealing ring is assembled with the liquid storage tank shell, the sealing ring must not block the ventilation channel of the screw cap.