RESIN-MADE CAGE FOR ROLLING BEARING, ITS MANUFACTURING METHOD AND ROLLING BEARING

摘要

PROBLEM TO BE SOLVED: To provide a resin-made cage for a rolling bearing having excellent durability, and its manufacturing method.;SOLUTION: A resin-made cage for a rolling bearing is manufactured by an injection molding method which injects a molten resin material into a cavity from a gate G of a metal mold. The resin-made cage for the rolling bearing comprises a pair of annular parts 1, 1 which are arranged in parallel with each other with an interval in an axial direction, and a plurality of columns 3 which are arranged in a peripheral direction with equal intervals, and connect both the annular parts 1, 1. A formation position of the gate G of the metal mold is a position in which weld lines W1a, W1b for dividing the annular parts 1, 1 to the peripheral direction are formed in a region in the peripheral direction which adjoins a pocket 5 out of the annular part 1, 1. Two recesses 7a, 7b which are opened in the cavity, and into which the molten resin material can flow are formed at the metal mold. Formation positions of the two recesses 7a, 7b in the metal mold are positions in the peripheral direction corresponding to the two columns 3, 3 which adjoin each other with the weld lines W1a, W1b of the annular parts 1, 1 sandwiched therebetween.;SELECTED DRAWING: Figure 5;COPYRIGHT: (C)2018,JPO&INPIT