Patent ID: 7610883
Filing Date: 2009-11-03
Classification: F01L

Abstract:
1. A valve timing control apparatus for an engine, comprising: a driving side rotational member rotating synchronously to a crankshaft; a driven side rotational member arranged coaxially to the driving side rotational member to be relatively rotatable and rotating integrally to a camshaft; a fluid pressure chamber formed between the driving side rotational member and the driven side rotational member and defined into an advanced angle chamber and a retarded angle chamber; a relative rotational phase adjusting mechanism controlling to selectively supply and drain a working fluid to and from the advanced angle chamber and the retarded angle chamber and adjusting a relative rotational phase of the driving side rotational member and the driven side rotational member between a most advanced angle phase where a volume of the advanced angle chamber is maximized and a most retarded angle phase where the volume of the advanced angle chamber is minimized; and a valve mechanism provided at a passage introducing an outside air to the advanced angle chamber and the valve mechanism allowing communication between an outside of the fluid pressure chamber and the advanced angle chamber to introduce the outside air to the advanced angle chamber when a fluctuated torque generated at the camshaft exceeds a torque applied to the driven side rotational member by the relative rotational phase adjusting mechanism.