초록 ▼

A fan drive assembly including a cooling fan (11) and a fluid coupling device (13). The cooling fan includes a fan hub (17), a spider (15), and a plurality of fan blades (19). The coupling device has an output coupling assembly (21) including a body (23) and a cover (25). The body (23) includes pref

A fan drive assembly including a cooling fan (11) and a fluid coupling device (13). The cooling fan includes a fan hub (17), a spider (15), and a plurality of fan blades (19). The coupling device has an output coupling assembly (21) including a body (23) and a cover (25). The body (23) includes preferably only three mounting portions (67), each being disposed immediately adjacent an outer periphery of the body. Each of the mounting portions (67) defines the necessary machining chucking surfaces (73), and a spider mounting surface (75) including a pilot surface (77) engaging the pilot diameter (79) of the spider (15). The body (23) includes cooling fins (61) covering substantially all of the rearward surface (59) of the body not covered by the mounting portions. The fan hub (17) also includes a rearwardly extending air dam portion (81), limiting localized radial air flow. The fan drive is able to improve the radial air flow through the body cooling fins and achieve subatantially greater heat dissipation from the fan drive assembly, thus permitting greater fan speed for a given input speed.

대표청구항 ▼

1. A fan drive assembly of the type comprising a cooling fan attached to a fluid coupling device, said cooling fan providing a rearward air flow and including a fan hub, a spider portion attached to said hub and a plurality of fan blades extending radially from said fan hub; said fluid coupling devi

1. A fan drive assembly of the type comprising a cooling fan attached to a fluid coupling device, said cooling fan providing a rearward air flow and including a fan hub, a spider portion attached to said hub and a plurality of fan blades extending radially from said fan hub; said fluid coupling device including a rotatable coupling assembly including a body member having a rearward surface, and a cover member cooperating with said body member to define a fluid chamber therebetween, a rotatable coupling member disposed in said fluid chamber for rotation relative to said coupling assembly; said coupling assembly and said coupling member cooperating to define a viscous shear chamber therebetween, whereby torque may be transmitted from said coupling member to said coupling assembly in response to the presence of viscous fluid in said viscous shear chamber; said body member including a plurality of cooling fins on said rearward surface, characterized by:said spider portion mounted to said body member so that said spider portion is rearward of said cooling fins; and said fan hub defining a rearward axially extending air dam portion at each of said plurality of fan blades, said dam portion extending rearward beyond said plurality of cooling fins.