Borgwarner Inc.

Mike Duffield

Braman C Wing

Marty Gardner

Frank R Smith

A variable camshaft timing apparatus ( ) includes a pulse actuating circuit ( A, R and R, A) for oscillating the variable camshaft timing apparatus in reaction to fluid under pulsation, and includes a pressure actuating circuit ( A, R, and R, A, ) for oscillating the variable camshaft timing device in reaction to fluid under pressure. Advance and retard valves ( ) are interconnected with the pulse and pressure actuating circuits for independently and simultaneously activating the pulse and pressure actuating circuits. Finally, an exhaust valve ( ) is positioned in fluid communication with the pulse and pressure actuating circuits, such that the variable camshaft timing device may be oscillated using one or both of the pulse actuating and pressure actuating circuits, and may be maintained in position using one or both of the pulse actuating and pressure actuating circuits.

Growing community of inventors

Willseyville, NY, United States of America

Mike Duffield