Borgwarner Inc.

William Eybergen

David Curtis Turner

Dale Arden Stretch

Thomas A Gee

Wade Alan Smith

An electronically controlled magnetorheological fluid based fan drive assembly used to increase the rotational speed of a coupled radiator cooling fan. Introducing a magnetic field within a working chamber between a drive ring and an output member increases the viscosity of a magnetorheological fluid by changing the state of the fluid from a free flowing liquid to a semi-solid state. The shear rate of the magnetorheological fluid can be increased to create additional torque to drive the output member and coupled radiator fan at a higher rotational speed to cool the engine coolant flowing through a closely coupled radiator. The magnetic field is induced by directing a flow of electrical current through an electronic coil coupled within the fan drive assembly , and an electronic control unit coupled to the electronic coil controls the amount of electrical current flowing through the coil . This maintains the temperature of the engine block within an acceptable temperature range at a particular engine speed.

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Windsor, CA, United States of America

William Eybergen