Patent ID: 7934871

Claim:
A double row ball bearing comprising: an outer ring that includes double row raceway surfaces different in diameter from each other; an inner ring that includes double row raceway surfaces corresponding to the raceway surfaces of the outer ring, respectively; a plurality of large diameter balls and a plurality of small diameter balls that are disposed between the raceway surfaces of the rows of the inner and outer rings with different pitch diameters, respectively; a large diameter cage that retains the plurality of large diameter balls; and a small diameter cage that retains the plurality of small diameter balls, wherein the large diameter cage comprises an asymmetric shape with respect to a center in an axial direction, a diameter of the large diameter cage close to an end section opening is greater than a diameter close to the small diameter cage, wherein the small diameter cage comprises a symmetric shape with respect to a center in an axial direction, a diameter of the small diameter cage close to an end section opening is substantially equal to a diameter close to the large diameter cage, and wherein the plurality of large diameter balls and the plurality of small diameter balls are disposed between the raceway surfaces of the rows of the inner and outer rings such that each of ball bearings constituted by the large diameter balls and the small diameter balls forms an angular ball bearing.