Wheel rolling bearing apparatus

A wheel rolling bearing apparatus comprising:

• a drive shaft including a larger-diameter portion formed at an inner side portion thereof and a smaller-diameter portion formed at an outer side portion thereof;
• an inner shaft mounted on an outer periphery of the smaller-diameter portion through a spline;
• and
• an inner ring for a rolling bearing, fixed to the inner shaft by caulking an inner-side shaft end of the inner shaft;
• wherein an inner side surface of a caulking portion formed by the caulked shaft end abuts against an outer side surface of the larger-diameter portion, and the drive shaft is pressed toward the outer side relative to the inner shaft, thereby connecting the drive shaft and the inner shaft together, and
• abutting portions of the side surfaces, abutting against each other, of the caulking portion and the larger-diameter portion are formed respectively into such shapes that a pressure contact distribution obtained at the abutting surfaces by the pressing of the drive shaft is made generally uniform.

A wheel rolling bearing apparatus comprising:

• a drive shaft including a larger-diameter portion formed at an inner side portion thereof and a smaller-diameter portion formed at an outer side portion thereof;
• an inner shaft mounted on an outer periphery of the smaller-diameter portion through a spline;
• and
• an inner ring for a rolling bearing, mounted on an outer periphery of the inner shaft from an inner side,
• wherein the drive shaft, the inner shaft and the inner ring are assembled together so that an inner side surface of the inner ring abuts against an outer side surface of the larger-diameter portion, and the drive shaft is pressed toward the outer side relative to the inner shaft, and
• wherein the inner ring has a curved surface portion formed at a corner portion defined by the inner side surface and an inner wall surface formed at an inner peripheral edge of the inner side surface, and the curved surface portion is connected with the inner side surface in tangential relation thereto.