Patent ID: 8851761

Claim:
A split cage for a rolling bearing, comprising, a plurality of cage segments made of synthetic resin, each of the cage segments having a pair of rims that face each other while being separated from each other by a predetermined distance, a plurality of cage bars extending from one of the rims to the other one of the rims, and pockets that accommodate rolling elements and each of which is formed of a space defined by the two cage bars adjacent to each other and the rims, wherein: the cage segments are arranged in a circular manner in a circumferential direction such that end faces of the rims of one of the adjacent cage segments face corresponding end faces of the rims of the other one of the adjacent segments, and the cage segments include: outer guide portions that are formed on outer peripheries of the cage bars so as to project radially outward and that come into sliding contact with an outer ring raceway surface of a rolling bearing so as to guide rotation of the split cage; inner guide portions that are formed on inner peripheries of the cage bars so as to project radially inward and that come into sliding contact with an inner ring raceway surface of the rolling bearing so as to guide rotation of the split cage; and a radial movement restricting unit that includes protrusions that are formed at one ends of the rims and that protrude in the circumferential direction, and grooves that are formed at the other ends of the rims and that are recessed in the circumferential direction, the protrusions of the one of the adjacent cage segment being fitted in the grooves of the other one of the adjacent cage segments, the protrusions having a triangular prism shape, in which a ridge line of a vertex of the protrusion extends in an axial direction of the split cage, the groove is a cutout having a triangular sectional shape that conforms to the protrusion, and the vertex of the protrusion being disposed along a same lane as one of the plurality of cage bars.