Patent ID: 7708467
Filing Date: 2010-05-04
Classification: F16C

Abstract:
1. A vehicle wheel bearing apparatus comprising: an outer member formed on its outer circumference with a body mounting flange to be mounted on a suspension of a vehicle, its inner circumference includes double row outer raceway surfaces; an inner member includes a wheel hub formed with a wheel mounting flange on one end, a cylindrical portion axially extends from the wheel mounting flange, an inner ring or an outer joint member of a constant velocity universal joint is press-fit onto the wheel hub and the inner ring is formed on its outer circumference with inner raceway surfaces arranged opposite to the double row outer raceway surfaces; double row rolling elements are freely rollably contained between the outer and inner raceway surfaces of the outer and inner members, via cages; seals are mounted within annular openings formed between the outer and the inner members; a backup seal is fit onto the outer circumference of the outer side end of the outer member, the backup seal comprises a metal core including a cylindrical fitting portion and an upstanding portion extending radially outward from the fitting portion, a sealing member is integrally adhered to the metal core; the sealing member has a side lip formed to extend radially outward from the metal core and inclined toward the inner side surface of the wheel mounting flange so as to slid ably contact the flange via a predetermined interference; and an annular metal plate is secured on the inner side surface of the wheel mounting flange and being sandwiched between the inner side surface and hub bolts mounted on the wheel mounting flange, the annular metal plate is made by pressing a steel plate having preservation ability, and wherein the side lip is adapted to be slidably contacted to the annular metal plate.