| abstract |
(57) [Problem] To provide a multi-mode VCT system that can be maintained at an arbitrary position between a most advanced position and a most retracted position. SOLUTION: Advance, retard chamber 24A, 24R and pulse and pressure drive means interconnecting them. The pulse driving means comprises retard pulse means 50, 44, 56 for conveying fluid from the chamber 24A to the chamber 24R under pulsation, and And advanced pulse means 52, 46 and 54 for transporting fluid from the chamber 24A to the chamber 24A. The pressure driving means is a retard pressure supply means 3 for supplying a fluid to the chamber 24R. 4, 46, 52 and retard pressure discharge means 50, 44, 64, 180, 32 for discharging fluid from the chamber 24A. And advanced pressure supply means 34, 44, 50 for supplying fluid to the chamber 24A, and advanced pressure discharge means 52, 46, 66, 1 for discharging fluid from the chamber 24R. 80 and 32. |