Patent ID: 7565889

Claim:
A valve timing control apparatus comprising: a drive-side rotating member that rotates in time with a crankshaft of an internal combustion engine; a driven-side rotating member that is positioned coaxially with the drive-side rotating member and that rotates in time with a camshaft; a phase-controlling mechanism for variably controlling a phase of relative rotation between the drive-side rotating member and the driven-side rotating member; and a locking mechanism for restraining displacement of the phase of relative rotation in a prescribed lock phase, wherein the locking mechanism has a sliding groove provided to one of the drive-side rotating member and the driven-side rotating member, a locking member for sliding along the sliding groove, and a concave engagement part that is provided to the other of the drive-side rotating member and the driven-side rotating member, for engaging with the locking member in a state in which the phase of relative rotation is the lock phase, and that has an inlet port from which a hydraulic fluid can be introduced, characterized in that the valve timing control apparatus further comprising: a flow channel for the hydraulic fluid provided to at least one of the sliding groove and the locking member, formed along a sliding direction of the locking member, and communicatingly connected to the concave engagement parts; wherein the flow channel for the hydraulic fluid is provided to a sliding surface between the sliding groove and the locking member; and wherein the flow channel for the hydraulic fluid is formed by chamfering a corner part of at least one of the sliding groove and the locking member having a polygonal cross section.