| 摘要 |
A pressed cage (1) for a ball bearing, particularly a pressed cage (1) for a ball bearing which is to be used in an environment of severe lubrication conditions, and in which seizure between a ball (5) and the cage (1) hardly occurs, a lubricant can be held for a long period, and the life period of the bearing can be prolonged is provided. In order to attain the object, ball holders and flat portions which are formed at regular intervals in the circumferential direction are formed in annular holding plates (2). A first spherical recess (3a) having a radius of curvature which is slightly larger than that of a ball (5) is formed in each ball holder (2). A second spherical recess (3b) having a radius of curvature which is slightly smaller than that of the ball (5) is formed in first spherical recess (3a). Two annular holding plates (2) are opposed to each other so that the ball holders constitute pockets, thereby producing a pressed cage (1) for a ball bearing. A ball (5) disposed in each pocket (6) rotates while being supported on boundaries between the first and second spherical recesses (3a,3b). In this case, spaces (11) are formed between the front portion of the ball (5) and the junction portion (4) of the annular holding plates (2), and in the second spherical recess (3b). The spaces (11) function as lubricant sumps. The ball (5) contacts with boundaries between the first and second spherical recesses (3a,3b), i.e., the positions where the peripheral velocity of the rotating ball (5) is low. Therefore, the seizure resistance property is enhanced. <IMAGE> |
