Synthetic resin cage for angular ball bearings, injection mold, and method of manufacturing synthetic resin cage for angular ball bearings

摘要

PROBLEM TO BE SOLVED: To provide a synthetic resin holder for angular contact ball bearing capable of effectively eliminating an appearance defect while increasing the number of balls that can be held, by increasing the number of pockets without performing resin flow analysis in the case of novel design.SOLUTION: The present invention relates to a synthetic resin holder 1A for angular contact ball bearing in which multiple pockets 4 are formed from an annular part 2 and multiple column parts 3 that are formed in a circumferential direction while protruding axially from the annular part 2. The synthetic resin holder for angular contact ball bearing is characterized in that a recess A1 is provided in such a shape that a portion from the same axial coordinate position C1 as a center of a ball R in the pocket 4 on an inner face of the column part 3 or from a position axially separated from the axial coordinate position C1 on the inner face of the column part 3 to a distal end face 6A is cut. Since the synthetic resin holder for angular contact ball bearing is formed while including the recess A1, it is not necessary to check a deletion shape of a filling defect location by performing resin flow analysis each time the holder 1A is newly designed, the holder 1A can be made lightweight and cost of material can be saved.SELECTED DRAWING: Figure 1