Wheel Bearing Apparatus

摘要

A wheel bearing apparatus has a double row rolling bearing detachably united with a constant velocity universal joint. The double row rolling bearing has an outer member, an inner member, and double row rolling elements rollably disposed between the double row raceway surfaces of the outer member and inner member. The constant velocity universal joint has an outer joint member, a shoulder portion, and a shaft portion. A female thread is formed on the shaft portion. End faces of the shoulder portion and the caulked portion are formed with face splines, respectively. The face spline of the caulked portion has a portion where a tooth height of a tooth space of a portion radially outside the pitch circle diameter is set lower than that of other portions of the tooth space.

主权项

1. A wheel bearing apparatus has a double row rolling bearing detachably united with a constant velocity universal joint, the double row rolling bearing comprising:
an outer member formed on its outer circumference with a body mounting flange to be mounted on a body of a vehicle, the outer member inner circumference includes double row outer raceway surfaces; an inner member includes a wheel hub and at least one inner ring, the wheel hub is integrally formed with a wheel mounting flange on its one end, a cylindrical portion axially extends from the wheel mounting flange, the inner ring is press-fit onto the cylindrical portion of the wheel hub, the inner member is formed with double row inner raceway surfaces arranged opposite to the double row outer raceway surfaces; double row rolling elements are rollably disposed between the double row outer raceway surfaces of the outer member and the double row inner raceway surfaces of the inner member, the inner ring is axially immovably secured by a caulked portion, the caulked portion is formed by plastically deforming the end of the cylindrical portion radially outward; the constant velocity universal joint has an outer joint member including a cup-shaped mouth portion, a shoulder portion, forming a bottom of the mouth portion, a shaft portion axially extends from the shoulder portion, the shaft portion inner circumference includes a female thread; end faces of the shoulder portion of the outer joint member and the caulked portion are formed with face splines, respectively, the face splines join the double row rolling bearing and the constant velocity universal joint in a torque transmittable manner; the face spline of the caulked portion has a portion with a tooth height (HO) of a tooth space of a portion radially outside a pitch circle diameter (PCD) set lower than other portions of the tooth space.