Low-friction oil seal for shock absorber

Abstract

The invention relates to a sealing element, in particular to a low-friction oil seal for a shock absorber. The oil seal comprises a framework and an oil seal body. The oil seal body comprises at least one sealing lip and a dust-proof lip. The oil seal is characterized in that axial parallel veins are arranged on annular sealing surfaces formed by the sealing lips. The sealing lips comprise a first sealing lip and a second sealing lip, and first axial parallel veins and second axial parallel veins are arranged on the annular sealing surfaces formed by the first sealing lip and the second sealing lip respectively. Third axial parallel veins are arranged on an annular sealing surface formed by the dust-proof lip. The low-friction oil seal has the advantages that forming of critical lubricating oil film between contact surfaces of the sealing surfaces and a shock absorber shaft is facilitated, so that the contact area is reduced; and lubricating oil can be stored between the axial veins conveniently, so that the friction coefficient between the oil seal and the shock absorber shaft is reduced, the friction between the oil seal and the shock absorber shaft is reduced on the premise that the radial sealing force is not changed, and the service life of the oil seal is increased.

Description

technical field [0001] The invention relates to a seal, in particular to a low-friction shock absorber oil seal. Background technique [0002] Shock absorbers are commonly used components on modern vehicles, and the oil seal structure and quality of the shock absorbers are crucial to the service life of the shock absorbers. The sealing ability of the oil seal depends on the thickness of the oil film on the sealing surface. If the thickness of the oil film between the sealing lip and the shaft is too large, the oil seal will leak; if the thickness is too small, dry friction may occur, causing the oil seal and shaft to wear. During the use of the car, there are often problems such as oil leakage, abnormal noise, and poor durability of the shock absorber due to the high friction of the oil seal. But at the same time, the oil seal must realize the sealing of the shock absorber oil and high-pressure gas inside the shock absorber, and must require the oil seal to generate a radia...

AI Technical Summary

Problems solved by technology

The sealing ability of the oil seal depends on the thickness of the oil film on the sealing surface. If the thickness of the oil film between the sealing lip and the shaft is too large, the oil seal will leak; if the thickness is too small, dry friction may occur, causing the oil seal and shaft to wear

During the use of the car, there are often problems such as oil leakage, abnormal noise, and poor durability of the shock absorber due to the high friction of the oil seal.

But at the same time, the oil seal must realize the sealing of the shock absorber oil and high-pressure gas inside the shock absorber, and must require the oil seal to generate a radial force on the shaft of the shock absorber that can overcome the maximum pressure of the inner cylinder of the shock absorber. Generally, the oil seal is required to be at 3 The radial force on the shock absorber shaft must be maintained within one year or 50,000 kilometers. Therefore, when designing the oil seal, the radial force required for the seal must first be met. According to the theory that the friction force is equal to the product of the radial force and the friction coefficient, When the design value of the radial force is large, a large axial friction force will inevitably be generated under the condition that the friction coefficient remains unchanged. Dry grinding, abnormal noise and even shock absorber oil leakage will affect the comfort of the car and the service life of the shock absorber

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