Patent ID: 7883273

Claim:
A cage for use in a roll bearing, comprising: a plurality of pins for rotatably supporting rolling elements of a roller bearing; and a pair of annular side plates for retaining, by way of the pins, the rolling elements each at an equal distance in a circumferential direction of a bearing ring; wherein pin-receiving holes in which fit one ends of the pins are formed in both of the pair of annular side plates, a fit between the pins and the pin-receiving holes is applied as an interference fit for 5 μm or more and 40 μm or less, and the ends of the pins fitting into the pin-receiving holes are welded to the annular side plates, the annular side plates having weld portions for the pins and the annular side plate at an outer lateral surface, the weld portions being in a ring shape with a substantially constant width; wherein said one ends of the pins are formed to a smaller diameter than that of the other ends; and wherein the pins have shaft portions passing through rolling element insertion holes formed in the axial cores of the rolling elements and the two ends of the pins fitting into the pin-receiving holes are formed each to a larger diameter than that of the shaft portions.