Patent ID: 7059777

Claim:
An assembly for a ball bearing with double raceway comprising: an inner ring member provided with a large-diameter raceway surface and a small-diameter raceway surface from one toward another in an axial direction on an outer peripheral surface; double row cages arranged in outer diameter sides of the respective raceway surfaces in the inner ring member; each of said double row cages including: a large ring portion; a small ring portion disposed on an inner diameter side of said cage; said small ring portion including a first bridge surface axially extending by a predetermined distance from a lower portion of said small ring portion towards said large ring portion and a second bridge surface angularly extending at an incline from said first bridge surface towards a lower portion of said large ring portion; and said large ring portion including a first bridge surface axially extending by a predetermined distance from an upper portion of said large ring portion towards said small ring portion and a second bridge surface angularly extending at an incline from said first bridge surface of the large ring portion towards an upper portion of said small ring portion; said bridge surfaces together forming a single bridge for containing a single ball; and double ball rows respectively held in the cages, wherein the inner ring member, the respective cages and the respective ball rows are assembled in a non-separable manner, and are assembled in an outer ring member provided with a large-diameter raceway surface and a small-diameter raceway surface from one toward another in an axial direction on an inner peripheral surface in correspondence to both the raceway surfaces from one side in the axial direction.