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

摘要

To provide a manufacturing method using injection molding which can suppress the generation of weld even if a cage is small in diameter, a high-rigidity resin-made cage having no risk of damage caused by the weld, and a rolling bearing having the high-rigidity resin-made cage and excellent in durability.SOLUTION: A cavity having a base-part equivalent part having a shape corresponding to a base part of a cage to be obtained, a column-part equivalent part having a shape corresponding to a column part, and a pocket equivalent part having a shape corresponding to a pocket are formed. A first resin sump is arranged at one of both sides of the column-part equivalent part in a peripheral direction in a position in which molten resin compositions meet each other, and a second resin sump is arranged at the other. The molten resin composition containing reinforcing fibers is poured from a single gate by using a molding metal mold in which an opening area of a cage peripheral face of a communication part communicating with the column-part equivalent part of the first resin sump differs from an opening area of a cage peripheral face of the communication part of the column-part equivalent part of the second resin sump.SELECTED DRAWING: Figure 1