The embodiment of the utility model discloses two many wedges of inner circle pulley type double column angular contact ball bearing, this bearing include outer lane, inner circle and two steel balls at least, be equipped with on the outer peripheral face of outer lane can with a plurality of parallel V type teeth of polywedge bet assorted on the actuating mechanism of transmission equipment, the inner circle includes that it overlaps left inner circle and the right inner circle of locating in the outer lane side by side to follow the axial, and the surface of left inner circle and right inner circle has been seted up respectively outer channel, both ends have wide terminal surface and narrow end face respectively about the axial of left inner circle and right inner circle, and the narrow end facial features of left inner circle and right inner circle is to setting up, and just the ditch heart between the outer channel of left inner circle and right inner circle satisfies following condition apart from value ai: ai=Ae+Ga 2BDwsin alpha. The embodiment of the utility model provides a, the axial internal clearance of bearing can accurately according to the designing requirement, quantitative realize little axial internal clearance through play optimization method optimal design.