Patent ID: 7918198
Filing Date: 2011-04-05
Classification: F01L

Abstract:
1. A valve timing control device comprising: a driving side rotational member synchronously rotatable with a crankshaft of an internal combustion engine; a driven side rotational member coaxial with said driving side rotational member and synchronously rotatable with a valve opening/closing cam shaft of the internal combustion engine; a fluid pressure chamber formed in one of said driving side rotational member and said driven side rotational member; a partitioning portion provided in the other of said driving side rotational member and said driven side rotational member for partitioning said fluid pressure chamber into an advanced angle chamber and a retarded angle chamber; a fluid feeding/discharging mechanism for feeding/discharging fluid to/from said advanced angle chamber and said retarded angle chamber; a phase displacement restricting mechanism for creating a restricting state where relative rotational phase displacement of said driven side rotational member relative to said driving side rotational member is restricted within a permissible range and an unrestricting state where the restriction is released; a communication passageway for establishing communication between said phase displacement restricting mechanism and a valve timing adjusting chamber which is one of said advanced angle chamber and said retarded angle chamber; a valving element chamber provided in said communication passageway; a valving element provided in said valving element chamber, said valving element selectively positioned to a closing state for closing said communication passageway to render said phase displacement restricting mechanism into said restricting state and an opening state for opening up said communication passageway to render said phase displacement restricting mechanism into said unrestricting state; and a leak passageway formed in at least one of said valving element and said valving element chamber and configured to allow leakage of fluid from an intermediate passage to the outside when said valving element is under the closing state, said intermediate passage comprising a space which is located between said communicated valve timing adjusting chamber or said phase displacement restricting mechanism and said valving element and which constitutes a portion of said communication passageway.