| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a multi-row combination ball bearing capable of preventing a trouble such as breakage or crack of a bearing ring, even when subjected to an extremely large thrust load. <P>SOLUTION: The multi-row combination ball bearing 10 includes at least two rows of ball bearings 11A, 11B in a parallel assembly, with a counter-bore 12d formed in a groove shoulder 12c of an outer ring 12 of each of the ball bearings 11A, 11B. The dimensions of the internal and external diameters and the width of the ball bearings 11A, 11B correspond to an ISO-standard bearing. Extended lines La, Lb from lines between a ball center O of the left-side ball bearing 11A and each of radial end points a, b of a contact ellipse C in an outer ring raceway groove 12a pass through the outer peripheral face of the outer ring 12 of the ball bearing 11A and an axial end flat face 12e of the outer ring 12 of the right-side ball bearing 11B adjacent to the ball bearing 11A at one axial side. Extended lines La, Lb from lines between a ball center O of the right-side ball bearing 11B and each of radial end points a, b of a contact ellipse C in an inner ring raceway groove 13a pass through the inner peripheral face of an inner ring 13 of the right-side ball bearing 11A and an axial end flat face 13e of the inner ring 13 of the left-side ball bearing 11A. <P>COPYRIGHT: (C)2012,JPO&INPIT |
