| 摘要 |
<p>A pulley device having a bearing of precise dimensional tolerance (precision ground) supported in a sheave of less precise tolerance including a ball or roller bearing with an inner and an outer race, and an elastic ring supported by the outer race. The pulley device additionally includes a two piece sheave enclosing the outer race and the ring effective to place the ring under a compressive load whereby the main body of radial load on the pulley is transmitted to the bearing through the ring, resulting in the ring being compressed around the outer surface of the bearing assuring a firm, reliable grip on the bearing, and while the sheaves are in contact with the end portion of the outer race of the bearing to maintain proper roundness of the bearing as precision ground. A method of mounting a precision bearing in a sheave whose dimensions are less precise where the sheave is composed of two disc-like elements substantially identical but of opposite hand comprising the steps of mounting an elastic ring on the outside diameter of the outer bearing race and compressing the elastic ring against the bearing race by bringing the disc-like elements together in face to face contacts so as to encircle the bearing and the ring. The method additionally includes securing thereafter the disc-like elements together by riveting, bolting or the like.</p> |
