Patent ID: 8360649

Claim:
A wheel bearing apparatus incorporating a wheel speed detecting apparatus comprising: an outer member integrally formed with a body mounting flange on its outer circumference, said body mounting flange to be mounted on a suspension apparatus of a vehicle, and said outer member inner circumference includes double row outer raceway surfaces; an inner member including a wheel hub and at least one inner ring, the wheel hub having, at one end, an integrally formed wheel mounting flange, said wheel hub outer circumference including an inner raceway surface, a cylindrical portion axially extending from the inner raceway surface, the inner ring being fit onto the cylindrical portion of the wheel hub, the inner ring being formed with another inner raceway surface on its outer circumference, the another inner raceway surfaces arranged opposite to the double row outer raceway surfaces; double row rolling elements are freely rollably contained between the inner and outer raceway surfaces, respectively, of the inner member and the outer member; seals are mounted in annular openings formed between the outer member and the inner member; a sensor holder is injection molded from a synthetic resin, the wheel speed detecting sensor is embedded in said sensor holder, said sensor holder is mounted on an inner side end of the outer member; an inner side seal of the seals including an annular sealing plate, a slinger and a pulser ring, the slinger has a substantially L-shaped cross-section and is mounted onto the outer circumference of the inner ring, the pulser ring is fit onto the outer circumference of the slinger, the pulser ring includes a magnetic encoder with circumferential characteristics that alternately and equidistantly change; the sealing plate includes a metal core press formed from a steel plate, the sealing plate is insert molded into the sensor holder and includes an exposed portion of the metal core that is into the end portion of the outer member, a sealing member is integrally bonded to the metal core, the seal member has integrally formed side lips and radial lips; the side lips of the sealing member are in sliding contact with the slinger and/or the pulser ring; the magnetic encoder and a wheel speed sensor are arranged opposite each other via a radial gap; an anchoring portion is integrally formed with the metal core and the sensor holder integrally molded with the metal core from synthetic resin surrounding the anchoring portion; and a plurality of circular apertures is formed in an outer cylindrical portion of the metal core along its circumference.