High-pressure brake pump FKM seal ring
The rubber sealing system on the high-pressure brake pump of new energy vehicles is a very important part, mainly in the following aspects
Seal material requirements
Since it has to withstand the pressure of high-pressure brake fluid, the sealing material needs to have excellent pressure resistance and wear resistance. Commonly used materials include nitrile rubber (NBR), fluororubber (FKM), etc.
Seal structure design
The high-pressure brake pump sealing system usually adopts a combined structure, including multiple seals such as O-rings, V-rings, and oil seals. Their geometric dimensions and installation positions need to be precisely designed to ensure good sealing.
Preload design
The preload of the seal is one of the key parameters, and it is necessary to comprehensively consider factors such as pressure, temperature, and wear to optimize the design to ensure long-term reliable sealing.
Surface treatment process
The working surface of the brake pump often uses special surface treatment processes such as hard coating or quenching to improve wear resistance and reduce the risk of leakage.
Physical performance refers.
| Color | Black |
| Hardness, Durometer Shore A | 69.5/70/95 |
| 100% Modulus | 6.6 (959), MPa (psi) |
| Tensile Strength at Break | 13.6 (1885), MPa (psi) |
| Elongation at Break | 179, % |
| Compression Set | |
| 70 hrs. at 200°C (392°F) | 41 |
| 336 hrs. at 200°C (392°F) | 58 |
| 672 hrs. at 200°C (392°F) | 63 |
| Upper Service Temperature, | 220°C (428)°F |
| Lower Service Temperature, | (-42)°C (-43.6) °F |
Maintenance and maintenance
The rubber seals of the high-pressure brake pump need to be checked and replaced regularly to avoid leakage problems caused by aging and wear. Repairs should be strictly carried out in accordance with manufacturer standards.
The dimensional accuracy range of the O-ring of the high-pressure brake system is as follows
Cross-sectional dimension tolerance
The cross-sectional diameter tolerance of the O-ring is usually controlled within ±0.05mm. Too large tolerance will affect the preload and sealing performance of the O-ring in the groove.
Surface roughness
The surface roughness of the O-ring contact surface is usually required to be Ra≤0.4μm. Too rough a surface will accelerate the wear of the O-ring.
Hardness tolerance
The hardness of the FKM O-ring is usually controlled at 70±5Shore A. Too high hardness will affect sealing, and too low hardness will reduce wear resistance.
product key technologies
Inner diameter tolerance range
The standard tolerance is generally around ±0.10mm. For some key dimensions, it can be further reduced to within ±0.05mm. This is to ensure that the O-ring can fit closely with the mating surface and ensure good sealing.
Roundness tolerance
Roundness tolerance
The roundness tolerance of the O-ring is generally controlled within 0.02mm. Excessive roundness deviation will cause uneven sealing contact area and affect sealing.
Other requirements: The shape, size consistency, material uniformity and other indicators of the O-ring also need to be strictly controlled to ensure stable performance of batch products.
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