Patent ID: 8585298
Filing Date: 2013-11-19
Classification: B60B,F16C

Abstract:
1. A wheel bearing apparatus incorporating a rotation speed detecting apparatus comprising: an outer member integrally formed with a body mounting flange on its outer circumference, the body mounting flange is 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 on its one end with a wheel mounting flange, 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 outer circumferences includes double row inner raceway surfaces opposing the double row outer raceway surfaces; double row rolling elements are contained between the inner raceway surfaces and outer raceway surfaces of the inner member and outer member; a pulser ring is adapted to be fit onto the outer circumference of the inner ring, the pulser ring has magnetic characteristics alternately and equidistantly varying along its circumferential direction; a cup-shaped sensor cap is secured on an inner-side end of the outer member; a rotation speed sensor, to detect the rotation speed of the wheel hub, is arranged at a position corresponding to the pulser ring via a predetermined axial air gap; the sensor cap is press-formed of anti-corrosion steel sheet into a cup-shaped configuration with a cylindrical fitting portion, to be press-fit with the inner side end of the outer member, and a bottom portion, extending radially inward from the fitting portion, to cover the inner-side end of the inner member; a fastener secured with the bottom portion of the sensor cap, the fastener fastening with the rotation speed sensor for securing the rotation speed sensor with the sensor cap; the rotation speed sensor is oppositely arranged so that it abuts or is positioned in close proximity to the bottom portion, and the rotation speed sensor and pulser ring are opposed with a predetermined axial air gap via the bottom portion; and an elastic member is pressed and elastically deformed between the fitting portion of the sensor cap and the end of the outer member.