Wheel bearing apparatus incorporated with a wheel speed detecting apparatus

A wheel bearing apparatus incorporating with a wheel speed detecting apparatus comprising:

• an outer member integrally formed with double row outer raceway surfaces on its inner circumference;
• an inner member including a wheel hub and at least one inner ring, the wheel hub being integrally formed with a wheel mounting flange on its one end, a cylindrical portion axially extending from the wheel mounting flange, the inner ring being press fit onto the cylindrical portion of the wheel hub, the wheel hub and the inner ring being formed on their outer circumferences with double row inner raceway surfaces opposing the double row outer raceway surfaces, the inner ring is axially secured on the wheel hub under a predetermined bearing pre-pressure by a caulked portion, the caulked portion is formed by plastically deforming the end of the cylindrical portion of the wheel hub;
• double row rolling elements are contained between the inner and outer raceway surfaces of the inner and outer members;
• a magnetic encoder is mounted on the inner ring;
• annular openings are formed between the inner and outer members, the annular openings are sealed by a seal mounted on an outer side end of the outer member and by a protecting cover;
• the protecting cover has a substantially dish-shaped configuration, the protecting cover is press-formed from a non-magnetic austenitic stainless steel sheet;
• and
• the protecting cover further comprising a cylindrical fitting portion adapted to be fit onto the outer member, a disc-shaped shielding portion extending radially inward from the fitting portion, a recess formed in the disc-shaped shielding portion for containing a sensor therein so that the sensor is accessible to the magnetic encoder, and a bottom portion extending from the shielding portion via an inclined portion close to the inner side end of the inner member, and the protecting cover is positioned to abut against a stepped portion formed on an end face or the inner circumference of an outer member or against a portion of the outer circumferential surface of the outer member.

A wheel bearing apparatus incorporating a wheel speed detecting apparatus comprising:

• an outer member integrally formed with double row outer raceway surfaces on its inner circumference;
• an inner member including a wheel hub and at least one inner ring, the wheel hub being integrally formed with a wheel mounting flange on its one end, a cylindrical portion axially extending from the wheel mounting flange, the inner ring being press fit onto the cylindrical portion of the wheel hub, the wheel hub and the inner ring being formed on their outer circumferences with double row inner raceway surfaces opposing the double row outer raceway surfaces, the inner ring is axially secured on the wheel hub under a predetermined bearing pre-pressure by a caulked portion, the caulked portion is formed by plastically deforming the end of the cylindrical portion of the wheel hub;
• double row rolling elements are contained between the inner and outer raceway surfaces of the inner and outer members;
• a magnetic encoder is mounted on the inner ring;
• annular openings are formed by the inner and outer members, the annular openings are sealed by a seal mounted on an outer side end of the outer member and by a protecting cover;
• the protecting cover has a substantially dish-shaped configuration, the protecting cover is press-formed from a non-magnetic austenitic stainless steel sheet;
• and
• the protecting cover further comprising a cylindrical fitting portion adapted to be fit onto the outer member, a disc-shaped shielding portion extending radially inward from the fitting portion, a through aperture formed in the disc-shaped shielding portion where an elastic member, close to the through aperture, is integrally adhered by vulcanizing adhesion, and the magnetic encoder and the sensor are arranged opposite to each other via the elastic member, and a bottom portion extending from the shielding portion via an inclined portion close to an inner side end of the inner member, and the protecting cover is positioned to abut against a stepped portion formed on the end face or the inner circumference of the outer member.