Resin Made Ball Bearing Retainer And Ball Bearing

Abstract: This resin-made retainer (40) comprises: at least one annular section (41); and a plurality of pillar sections (42) which respectively extend in the axial direction from the annular section (41) and rotatably hold balls (11) in cylindrical or partially cylindrical pockets (P) provided between neighboring pillar sections, wherein the annular section (41) has a guide surface guided by an inner peripheral surface of an outer ring (20) or an outer peripheral surface of an inner ring (30). The roundness of the guide surface is 5µm or smaller, the differences between 360°/the number of pockets and angles between the centers of neighboring pockets P are all within ±0.1°, and as the directions of the centers C of all the pockets P head toward an inner diameter side from an outer diameter side, the directions head toward any one side in the circumferential direction, and any one side in the axial direction. Accordingly, vibration of the retainer is reduced during rotation of the bearing, and the lifetime of the bearing can be improved.

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