| 摘要 |
PROBLEM TO BE SOLVED: To provide a synthetic resin made cage which hardly causes fracture by a delay or progress of balls during the rotation of a bearing.SOLUTION: In a synthetic resin made cage, a plurality of pockets 11 for accommodating balls 3 are formed at opposing faces 10 of two sheets of synthetic resin made annular bodies 9 at intervals in a circumferential direction, and the annular bodies 9 are formed of arc-shaped pocket wall parts 12 which form internal faces of the pockets 11, and are recessively curved in an axial direction, and flat-plate shaped connecting part parts 13 for connecting the adjacent pocket wall parts 12. Thicknesses A of the connecting part parts 13 are set not larger than 30% of diameters of the balls 3, and thicknesses B of pocket wall parts 12 at the deepest position 11a of the pockets 11 are set not larger than 10% of the diameters of the balls 3.SELECTED DRAWING: Figure 3 |
