| 摘要 |
<p>A variable speed fan drive (10) including a cantilevered support (18) and axially spaced bearings (72,74,76) for mounting an input drive member (39) with a cylinder portion (52) and an output fan hub assembly (56) for rotational movement relative to each other and to the support. A modulatable wet type clutch assembly (96) is operably effective to couple the input drive member (39) to the fan hub assembly (56). The output speed of the fan hub (58) is regulated by the axial compressive force a clutch engaging member (104) applies against interleaved members (98,100) of the clutch assembly (96). The clutch engaging member cooperates with the cylinder portion (52) of the input drive member to define an expansible chamber (108) so designed that all clutch clamping forces are confined within the drive member (39). As such, substantially no axial thrust load is exerted on the axially spaced bearings (72,74,76) during clutch application. The drive unit may further include cooperative elements (176,178) arranged on the drive member (39) and the fan hub assembly (56) for preventing belt cord debris from becoming entangled thereabout.</p> |
