| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method for a bearing cage which can suppress the lowering of rigidity.SOLUTION: Either of a resin injection gate 51 and a resin sump 40 which can store a molten resin is arranged at a column 20. A plurality of the resin injection gates 51 and a plurality of the resin sumps 40 are alternately arranged at a plurality of the columns 20 in a peripheral direction. The resin injection gate 51 is arranged in a position deviated to one side of the peripheral direction from a center of the peripheral direction of the column 20. The resin sump 40 is arranged in the center of the peripheral direction of the column 20. A cross section area of a communication part 42 of the resin sump 40 communicating with the column 20 is not larger than one quarter of a cross section area of the resin injection gate 51.SELECTED DRAWING: Figure 1 |
