Patent ID: 6358010
Filing Date: 2002-03-19
Classification: F04D,F05D,F16D

Abstract:
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.