Patent ID: 6206639
Filing Date: 2001-03-27
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 comprising a fan hub, a spider portion and a plurality of fan blades extending radially from said fan hub; said fluid coupling device comprising 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 and a plurality of mounting portions, said spider portion being attached to said mounting portions and defining a pilot diameter; characterized by:(a) each of said plurality of mounting portions being disposed immediately adjacent an outer periphery of said body member;(b) each of said mounting portions defining a machining chucking surface, and a spider mounting surface on a rearward face thereof, said spider mounting surface including a radially disposed pilot surface in engagement with said pilot diameter of said spider portion; and(c) said plurality of cooling fins covering substantially all of said rearward surface of said body member not covered by said mounting portions.