| 摘要 |
<p>A blower (1) including a frame having a base (3) in which a bladed impeller (10) is mounted by a bearing arrangement. The bearing includes a stepped shaft (7) with an inner ring (21) mounted on a reduced diameter shaft portion (7b) and axially biased by pre-loading spring (24) which bears against a stop ring (23). First and second rows of ceramic balls run around races formed in the larger diameter shaft portion (7a) and the inner ring (21) and are contained by races formed in an inner surface of a sleeve (6). The shaft (7) may be mounted on the base (3) and the impeller (10) connected for rotation with the sleeve (6). Alternatively, the sleeve (6) may be mounted in a bearing holder (4) formed integrally with the base (3) and the impeller (10) connected via a hub (8c) of magnets (9) holding yoke (8) to the larger diameter shaft portion (7a). <IMAGE></p> |
