| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ball bearing cage which makes grease hardly adhere to a seal groove of a bearing raceway ring which relatively rotates with respect to a seal, and can prevent the leakage of the grease. <P>SOLUTION: The ball bearing cage is constituted by stacking two annular cage half-bodies 12 so as to oppose each other in the axial direction, and these cage half bodies 12 are shaped so that a ball-shell shaped plate 11A forming a half of each pocket 11 and a flat plate 12a being a portion between the adjacent pockets 11 are alternately aligned in the circumferential direction. At least a plate thickness t1 at an external diameter face 2b having shoulder heights at both sides of a raceway face of a bearing inner ring in a portion at the side of an inside diameter rather than a ball-arrangement pitch circle PCD at the ball-shell shaped plate 11A is set smaller than a plate thickness t0 of the flat plate 12a. <P>COPYRIGHT: (C)2013,JPO&INPIT |
