Abstract: A cage for a thrust roller bearing is provided. The cage has first and second cage members each having an outer ring portion formed radially outside of a roller retention hole. The outer ring portion has a flange portion that extends, from a radially outer end of the outer ring portion, in an axial direction and is divided along the circumferential direction. The flange portion has a large diameter portion and a small diameter portion. The first cage member and the second cage member are fastened to each other while the large diameter portion and small diameter portion of the first cage member overlap the small diameter portion and large diameter portion of the second cage member, respectively.

Abstract: A cage for a thrust roller bearing is provided. The cage has first and second cage members each having an outer ring portion formed radially outside of a roller retention hole. The outer ring portion has a flange portion that extends, from a radially outer end of the outer ring portion, in an axial direction and is divided along the circumferential direction. The flange portion has a large diameter portion and a small diameter portion. The first cage member and the second cage member are fastened to each other while the large diameter portion and small diameter portion of the first cage member overlap the small diameter portion and large diameter portion of the second cage member, respectively.

Abstract: A roller bearing cage includes ring portions and pillar portions extend in an axial direction to connect the ring portions and disposed along a circumferential direction to define pocket portions. The pillar portion includes a bent portion formed in the vicinity of an axial center of the pillar portion so as to protrude radially inwards of the ring portions. A ring portion thickness is larger than a bent portion thickness; a pillar end portion thickness is larger than the bent portion thickness; and the pillar end portion thickness is equal to the ring, portion thickness or more, where the ring portion thickness is a radial thickness of the ring portion; the bent portion thickness is a radial thickness of the bent portion; and the pillar end portion thickness is a thickness of a portion of the pillar portion connected to the ring portion and in the vicinity thereof.

Abstract: A method of making a cage for use in a roller bearing comprises the steps of forming an inner circumferential groove centrally in an annular-shaped workpiece made of metal to define a circumferentially-extending side ring section on either side of the groove, punching the workpiece to form a plurality of axially-extending, circumferentially spaced-apart pockets for receiving rollers, and roughly abrading the outer peripheral surface of the workpiece. The punching and abrading steps inherently cause the outer peripheral surface of the workpiece at the side ring sections to become wavy, with a plurality of alternating recessed and raised portions. As a result of the abrading step, the difference in depth between the tops of the raised portions and the recessed portions is in the range of between approximately 60 .mu.m to 70 .mu.m.