US 7,571,543 B2
Method of manufacturing a retainer for a roller bearing
Kazuto Kobayashi, Kanagawa (Japan); Toshio Nakamura, Kanagawa (Japan); Keiichi Horino, Kanagawa (Japan); and Yoshiro Ide, Kanagawa (Japan)
Assigned to NSK Ltd., Tokyo (Japan)
Appl. No. 10/567,568
PCT Filed Aug. 06, 2004, PCT No. PCT/JP2004/011635
§ 371(c)(1), (2), (4) Date Feb. 08, 2006,
PCT Pub. No. WO2005/015038, PCT Pub. Date Feb. 17, 2005.
Claims priority of application No. 2003-290455 (JP), filed on Aug. 08, 2003; and application No. 2004-210946 (JP), filed on Jul. 20, 2004.
Prior Publication US 2006/0204158 A1, Sep. 14, 2006
Int. Cl. B21K 1/05 (2006.01); B21D 53/12 (2006.01); F16C 33/48 (2006.01)
U.S. Cl. 29—898.067  [29/898.065; 29/898.064; 384/572; 384/574] 4 Claims
OG exemplary drawing
 
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.