Patent ID: 8286353

Claim:
A method of manufacturing a cylindrical outer retainer for a one-way clutch comprising: an outer diameter-sided member having an inner peripheral face; an inner diameter-sided member having an outer peripheral face that faces in a radial direction said inner peripheral face; a plurality of torque transmitting members interposed between said inner peripheral face of said outer diameter-sided member and said outer peripheral face of said inner diameter-sided member and disposed in an inclinable manner selectively between a position for transmitting torque by engaging with said inner and outer peripheral faces and a position for being in a non-engagement state with said inner and outer peripheral faces; a spring member for biasing said plurality of torque transmitting members in such a direction as to engage with said inner and outer peripheral faces; and a cylindrical inner retainer and a cylindrical outer retainer holding said plurality of torque transmitting members at a predetermined interval in a circumferential direction and restraining an inclination thereof, said manufacturing method comprising: a step of placing on a die a previously formed cylindrical outer retainer blank that includes a pair of first and second annular portions facing each other in an axial direction, a plurality of column members disposed at a predetermined interval and connecting said pair of first and second annular portions in the axial direction, a plurality of window portions being configured by faces, opposite to each other in a peripheral direction, of neighboring ones of said plurality of column members and by faces, opposite to each other in the axial direction, of said pair of first and second annular portions, the first annular portion being formed with a radially outward flange at a side edge on a side opposite the second annular portion in the axial direction through an inner periphery-sided curve portion thereof, so that a radially inner surface of the first annular portion of said retainer blank, a surface of said inner periphery-sided curve portion, and a radially extended surface of the outward flange are in contact with a supporting surface of the die; and a step of cutting through a part of said first annular portion by sliding a punch having a thin-plate blade, from a radially outer side of said second annular portion through one of said plurality of window portions, in a direction having a component that is radially inward of the outer retainer blank and a component that is axial from the second annular portion to the first annular portion.