Roller bearing cage, roller bearing, and method of producing roller bearing race and roller bearing outer ring

摘要

A thrust roller bearing cage (10) is a plate-shaped circular ring in which four arcuate pieces 1a, 1b, ... are laser welded along laser welding lines (4ab, 4bc, ...). A plurality of rectangular pockets (2a, 2b, ...) are formed at regular intervals in the cage (10), including the intervals including the laser welding lines (4ab, 4bc, ...). Each of the laser welding lines (4ab, 4bc, ...) extends across the total length from the inner periphery to an outer periphery of the circular ring, so that the laser welding lines have sufficient length and strength. A predetermined strength of the cage (10) can be obtained without decreasing the number of rollers which may be accommodating and wastage of material when making cages from sheet material is reduced.