Patent ID: 9562447
Date: 2017-02-07
CPC Classifications: F01L

Claim:
1. A valve timing control device comprising: a driving side rotating body rotating in synchronization with a crankshaft of an internal combustion engine; a driven side rotating body rotating integrally with a camshaft of the internal combustion engine and rotatable relative to the driving side rotating body, the camshaft on which an average torque acts in a state where the camshaft rotates integrally with the driven side rotating body; a fluid pressure chamber formed by the driving side rotating body and the driven side rotating body; a partition portion arranged in the fluid pressure chamber and partitioned into a retard chamber and an advance chamber, the volume of the retard chamber increasing when a fluid flows in so that a relative rotational phase of the driven side rotating body with respect to the driving side rotating body changes into a retard direction and the volume of the advance chamber increasing when a fluid flows in so that the relative rotational phase changes into an advance direction; a concave portion disposed in one of the driving side rotating body and the driven side rotating body and a lock member arranged in a groove disposed in the other rotating member and engaged with the concave portion or separated from the concave portion, the relative rotational phase being switchable between a lock state where the relative rotational phase is retained to an intermediate lock phase between a most advance angle phase and a most retarded angle phase as the lock member is engaged with the concave portion and an unlock state where the retained intermediate lock phase is released as the lock member is separated from the concave portion; and a phase control unit controlling the supply of the fluid to the retard chamber and the discharge of the fluid from the advance chamber or the supply of the fluid to the advance chamber and the discharge of the fluid from the retard chamber so that the relative rotational phase changes, wherein the relative rotational phase changes in a same direction as a direction of the average torque acting on the camshaft by the supply of the fluid to the advance chamber or the retard chamber by the phase control unit when the relative rotational phase is in the lock state and the internal combustion engine a driving state.