Patent ID: 7571543
Filing Date: 2009-08-11
Classification: B21D,F16C,Y10T

Abstract:
1. A method of manufacturing a retainer for a roller bearing which is made of a metal plate and has a tubular main portion, a plurality of pockets formed in the main portion intermittently concerning a circumferential direction and capable of retaining rollers rollably on respective inner sides thereof, and an outwardly oriented flange-like collar portion formed at an axial end of the main portion, comprising the steps of: forming an annular intermediate material by subjecting the metal plate to die cutting; forming a second intermediate material by forming a plurality of through holes in the intermediate material intermittently concerning in the circumferential direction; plastically deforming an entire portion of the second intermediate material excluding a radially outer end portion thereof into a tubular shape; and forming the portion plastically deformed into the tubular shape as the main portion, forming a portion corresponding to the radially outer end portion of the second intermediate material as the collar portion or a collar portion element for forming the collar portion, and forming portions corresponding to the through holes as the pockets; wherein portions connecting a central hole of the second intermediate material and each of the through holes are formed in an arch shape in which a respective intermediate portion projects in an inward radial direction of the second intermediate material relative to both end portions, and the arch shape portion is extended circumferentially when the portion of the second intermediate material excluding the radially outer end portion thereof is plastically deformed into the tubular shape.