Seals for wheel bearings

Abstract

[Objective] To provide a sealing device for wheel bearings, which establishes optimal specifications based on the fastening force of the radial lip in the encapsulated seal, so as to improve the sealing performance in low temperature environment and muddy water environment. [Solution] The present invention includes: a sealing plate (12) composed of a sealing member (15) bonded to a core metal (14) by vulcanization bonding; and an oil slinger (13) including a cylindrical portion (13a) and a vertical plate portion (13b) extending radially outward. The sealing member (15) includes: a side lip (15b) extending radially outward at an angle and sliding against the riser portion (13b) with axial interference; and a radial lip formed in a bifurcated shape On the inner diameter side of the side lip (15b), it is composed of a grease lip (15c) and a dustproof lip (15d) slidingly contacting the cylindrical portion (13a) with a predetermined radial interference. The clamping coil spring (17) is installed on the dust-proof lip (15d), and its fastening force is set to be more than 50% of the total clamping force, and the clamping force setting when there is no clamping coil spring (17) for 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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