Resin material cages and rolling bearings for rolling bearings

摘要

PROBLEM TO BE SOLVED: To provide a cage made of a resin material for a rolling bearing having excellent durability. SOLUTION: A cage made of a resin material for rolling bearings has a pair of ring portions 1 and 1 arranged in parallel at intervals in the axial direction and both annulus portions 1 and 1 arranged at equal intervals in the circumferential direction. A plurality of pillars 3 for connecting 1 and 1 are provided. The weld lines W3a and W3b of the two pillars 3 and 3 sandwiching the pocket 5 have a convex shape in which the central portion in the circumferential direction protrudes in one axial direction from both ends in the circumferential direction and is curved. The degree of protrusion in one axial direction at the center of the direction is different. The weld lines W1a and W1b of the annulus portions 1 and 1 are formed in a circumferential region of the annulus portion 1 adjacent to the pocket 5, and the axial central portion thereof is in the circumferential direction with respect to both axially end portions. The weld lines W1a and W1b of the two annular portions 1 and 1 sandwiching the pocket 5 have a convex shape protruding in one direction and curved, and the degree of protrusion in the circumferential direction of the central portion in the axial direction. Is different. [Selection diagram] Fig. 5