Bearing device for wheel

Abstract

The present invention provides a bearing device for a wheel, the bearing device being configured so that rusting is prevented by improving the sealing properties between an outer member and a knuckle, the resistance of a seal to muddy water is improved, and the sealing performance of the seal can be maintained for a long period of time. A seal (9) comprises: a slinger (11) having a cylindrical section (11a) which is press-fitted into an inner ring (3) and an upstanding plate section (11b) which extends outward in the radial direction from the cylindrical section (11a); and a seal plate (12) comprising a metal core (13) which is press-fitted into an outer member (10) and a seal member (14) which has a pair of side lips (14a, 14b) and a grease lip (14c), the pair of side lips (14a, 14b) being joined to the metal core (13), the pair of side lips (14a, 14b) extending outward in the radial direction in a tilting manner and in sliding contact with the upstanding plate section (11b), the grease lip (14c) extending, on the inner diameter side of the side lips (14a, 14b), to the inner side of a bearing in a tilting manner. The seal member (14) wraps around the outer surface of an end of the metal core (13) and extends outward from the end in the radial direction to form an outer peripheral lip (17) having a substantially L-shaped cross-section. The outer peripheral lip (17) is disposed so as to be fitted in the gap between the outer member (10) and the flange section (18) of a knuckle (K).

Description

technical field [0001] The present invention relates to a wheel bearing device for rotatably supporting a wheel, and more particularly to a wheel bearing device capable of preventing Corrosion occurs and the sealing performance of the seal can be ensured for a long time by increasing the resistance of the seal to muddy water. Background technique [0002] In general, wheel bearing devices rotatably support hub wheels for mounting wheels by means of double row rolling bearings, and are classified into those for driving wheels and for driven wheels. For structural reasons, the inner ring rotary type wheel bearing unit is used for the driving wheel, while both the inner ring rotary type and the outer ring rotary type can be used for the driven wheel. In general, wheel bearing devices are classified into so-called first-generation types in which a wheel bearing including a double row angular contact ball bearing is fitted between a steering knuckle and a wheel hub; a vehicle bo...

AI Technical Summary

Problems solved by technology

[0007] Although high performance in preventing muddy water from entering the inside of the wheel bearing can be achieved by such a seal 50 of the prior art, it is difficult to have high muddy water resistance also under severe conditions, such as between the seal 50 and the outer member and the outer member When the fitting part between the steering knuckle and the outer member is directly exposed to muddy water

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