METHOD FOR MANUFACTURING BEARING CAGE

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a bearing cage capable of suppressing deterioration of a strength.SOLUTION: Regions among adjacent resin injection gates 51 are determined to be first to third regions S1 to S3. The respective three resin injection gates 51 are provided on columnar portions 20 so that the numbers of pockets 30 in the first to third regions S1 to S3 become equal to each other. Among the pair of columnar portions 20 adjacent to the pockets 30 positioned at the circumferential center of the first to third regions S1 to S3, a resin reservoir 40 capable of storing a melted resin is provided on one columnar portion 20. A cross sectional area of a communication section 42 of the resin reservoir 40 communicating with the columnar portion 20 is 1/4 or less the cross sectional area of the resin injection gate 51.SELECTED DRAWING: Figure 1