Patent number: 6453859
Abstract: A variable camshaft timing apparatus (10) includes a pulse actuating circuit (24A,50,44,56,60,24R and 24R,52,46,54,58,24A) for oscillating the variable camshaft timing apparatus in reaction to fluid under pulsation, and includes a pressure actuating circuit (30,34,36,40,44,50,24A,24R,52,46,66,80/180,32 and 30,34,38,42,46,52,24R,24A,50,44,64,80/180,32) for oscillating the variable camshaft timing device in reaction to fluid under pressure. Advance and retard valves (44,46) are interconnected with the pulse and pressure actuating circuits for independently and simultaneously activating the pulse and pressure actuating circuits. Finally, an exhaust valve (80,180, 280) 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.
Type:
Grant
Filed:
July 31, 2001
Date of Patent:
September 24, 2002
Assignee:
BorgWarner Inc.
Inventors:
Frank R. Smith, Braman C. Wing, Marty Gardner, Mike Duffield
Publication number: 20020088413
Abstract: A variable camshaft timing apparatus (10) includes a pulse actuating circuit (24A, 50, 44, 56, 60, 24R and 24R, 52, 46, 54, 58, 24A) for oscillating the variable camshaft timing apparatus in reaction to fluid under pulsation, and includes a pressure actuating circuit (30, 34, 36, 40, 44, 50, 24A, 24R, 52, 46, 66, 80/180, 32 and 30, 34, 38, 42, 46, 52, 24R, 24A, 50, 44, 64, 80/180, 32) for oscillating the variable camshaft timing device in reaction to fluid under pressure. Advance and retard valves (44, 46) are interconnected with the pulse and pressure actuating circuits for independently and simultaneously activating the pulse and pressure actuating circuits.
Type:
Application
Filed:
July 31, 2001
Publication date:
July 11, 2002
Inventors:
Frank R. Smith, Braman C. Wing, Marty Gardner, Mike Duffield