Patent ID: 7950858

Claim:
A vehicle wheel bearing apparatus comprising: an outer member formed with a body mounting flange on its outer circumference, said body mounting flange to be mounted on a knuckle of a vehicle, an inner circumference of said outer member including double row outer raceway surfaces; an inner member includes a wheel hub with a wheel mounting flange formed on one end, a cylindrical portion extends from said wheel mounting flange, at least one inner ring is press-fit onto the cylindrical portion of the wheel hub, said at least one inner ring formed with an inner raceway surface on its outer circumference, said inner raceway surface arranged opposite to the double row outer raceway surfaces; double row rolling elements are freely rollably contained between the outer raceway surfaces and inner raceway surfaces of the outer member and the inner members; seals are mounted within annular openings formed between the outer member and the inner member; said at least one inner ring is axially secured relative to the wheel hub by a caulked portion, said caulked portion formed by radially outwardly plastically deforming an end of the cylindrical portion of the wheel hub; outer side rolling elements of the double row rolling elements are balls and inner side rolling elements of the double row rolling elements are tapered rollers and a number of the inner side row of tapered rollers is set larger than a number of the outer side row of balls wherein an inner side outer diameter of the outer member is smaller than an outer side outer diameter of the outer member so that the inner side outer diameter is larger than a diameter of the outer side outer raceway surface; a fundamental rated load of the inner side row of tapered rollers is set larger than that of the outer side row of balls; a pitch circle diameter of the inner side row of tapered rollers is set smaller than a pitch circle diameter of the outer side row of balls; and a number of the inner side row of tapered rollers is set larger than a number of the outer side row of balls.