The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 24, 2002
Filed:
Jul. 31, 2001
Frank R. Smith, Cortland, NY (US);
Braman C. Wing, Ithaca, NY (US);
Marty Gardner, Ithaca, NY (US);
Mike Duffield, Willseyville, NY (US);
BorgWarner Inc., Troy, MI (US);
Abstract
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.