Wheel bearing sealing device

Abstract

Provided is a wheel bearing sealing device that sets the optimum specification based on the tension force of a radial lip in a pack seal and improves the sealing performance in low-temperature environments and muddy water environments. The wheel bearing sealing device comprises a seal plate (12) constituted by a seal member (15) bonded to a cored bar (14) through adhesion by vulcanization, and a slinger (13) that includes a cylindrical portion (13a) and a vertical plate portion (13b) extending outward in the radial direction. The seal member (15) includes a side lip (15b) which extends outward at an angle in the radial direction and slides against the vertical plate portion (13b) via axial-direction interference, and a radial lip that is formed in a bifurcated shape on an inner diameter side of the side lip (15b) and is constituted by a grease lip (15c) and a dust lip (15d) slide-contacting the cylindrical portion (13a) via radial-direction interference. A garter spring (17) is mounted on the dust lip (15d), and the tension force is set to be 50% or higher of the entire tension force while the tension force in a state where there is no garter spring (17) is set to be at least 3N.

Description

technical field [0001] The present invention relates to a sealing device for a wheel bearing for rotatably supporting a wheel with respect to a suspension device of a vehicle. Background technique [0002] The wheel bearing device is intended to freely rotatably support a hub wheel for mounting a wheel by means of double rows of rolling elements, and there are wheel bearing devices for a driving wheel and a driven wheel. For structural reasons, the inner ring rotation type is used for the driving wheel, and both the inner ring rotation type and the outer ring rotation type are used for the driven wheel. There are four generations of types in wheel bearing devices, namely: the first generation type in which a wheel bearing including a double row angular contact ball bearing etc. is fitted between the knuckle forming part of the suspension device and the wheel hub; Among them, the body mounting flange or the wheel mounting flange is formed directly on the outer circumference ...

AI Technical Summary

Problems solved by technology

The use of sealing devices in harsh environments with low temperature and muddy water is one of the causes of premature failure of sealing devices

It is worrying that even if the sealing member is formed of a material with improved low-temperature performance, the buckling force and followability of the sealing member will deteriorate due to the decrease in elasticity in the low-temperature environment, which will cause muddy water to enter the bearing interior prematurely.

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