Patent ID: 8627570
Filing Date: 2014-01-14
Classification: F16C,Y10T

Abstract:
1. A manufacturing method of a roller bearing cage including a cage main body formed with an annular plate, a plurality of cage pockets opened on the cage main body so as to be aligned along a circumferential direction of the annular plate, and the cage pockets configured to accommodate rollers having flat end faces, said method comprising: punching a metallic plate in an axial direction of the metallic plate; forming a plurality of cage pockets opened on the face of the annular plate; and pressing an edge of one of the cage pockets in a thickness direction of the annular plate with a press jig to form a chamfered portion and a flat portion on a side face of the one of the cage pockets, in a cross sectional view, the edge extending orthogonal to the radial direction so as to oppose one of the flat end faces of the rollers, wherein the press jig comprises a pressing face of a predetermined shape to form the chamfered portion, wherein the flat portion extends in the thickness direction, in a central part of the side face of the one of the cage pockets in the thickness direction, and wherein the chamfered portion is inclined to both of the radial direction and the thickness direction.