| 摘要 |
PURPOSE: A fan drive device assembly is provided for attaching a cooling fan to a main body of a fluid coupler in a way to substantially improve airflows passing through a cooling fin of the housing. CONSTITUTION: The fan drive device assembly has a cooling fan (11) and a fluid coupler device (13). The cooling fan (11) has a fan hub (17), a spider (15) and plural fan blades (19). The coupler device (13) has an output coupler assembly (21) including both a main body (23) and a cover (25). The main body (23) has attachment parts (67), preferably only three attachment parts (67), disposed extremely close to each other in the periphery of the main body (23). Each attachment part (67) is partitioned into a required machining chuck lock face (73) and a spider attachment face (75) having a pilot face (77) engaging with a pilot diameter part of the spider (15). The main body (23) has a cooling fin substantially covering all back face of the main body (23) except the attachment parts (67). The fan hub (17) has an air restriction part (81) extending rearward to restrict local radial airflows. |
