| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a retainer for a conical roller bearing, which can obtain the proper axial dimension of a major diameter ring after being formed by facilitating the bending of the major diameter ring having a short axial dimension. SOLUTION: The manufacturing method of the retainer for the conical roller bearing is provided with a step of forming a circular center hole 9 and a fan-like pocket hole 8 arranged at a plurality of positions separated by a width dimension of a minor diameter ring 31 at the outer peripheral side of the circular center hole 9 gradually widening as extending radially outward for a plate-like blank material 7, a step of forming a circumferential notch 12 separated by the width dimension of the major diameter ring 32 at the outer peripheral side of the pocket hole 8 in the plate-like blank material 7, a step of forming the truncated cone-retainer by bending the radial inside portion of the notch 12 of the plate-like blank material 7 to form a truncated cone shape with a mold 13 having an almost conical shaped mold surface, and a step of separating the retainer from the plate-like blank material 7. COPYRIGHT: (C)2008,JPO&INPIT
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