Valve timing control device

Abstract

A valve timing control device comprises a drive-side rotational member synchronously rotatable with a crankshaft of an internal combustion engine; a driven-side rotational member mounted coaxially with the drive-side rotational member and synchronously rotatable with a camshaft for opening and closing a valve of the internal combustion engine; a fluid pressure chamber defined by the drive-side rotational member and the driven-side rotational member; a partition provided in at least one of the drive-side rotational member and the driven-side rotational member for dividing the fluid pressure chamber into a retarded angle chamber and an advanced angle chamber; a fluid feeding/discharging mechanism for controlling feed/discharge of working fluid relative to the fluid pressure chamber; a locking mechanism for restricting a relative rotational phase of the driven-side rotational member relative to the drive-side rotational member to a predetermined phase between a most retarded angle phase and a most advanced angle phase; and an urging mechanism for constantly exerting an urging force to the drive-side rotational member and the driven-side rotational member to displace the relative rotational phase to the side of the most retarded angle phase.