Importance

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Abstract

A valve timing control apparatus includes a driving-side rotation member, a driven-side rotation member, and a lock mechanism including a recess portion, a lock member engageable and disengageable relative to the recess portion, and a biasing member. The recess portion includes a lock groove portion with which the lock member is configured to engage to lock a relative rotation phase at a lock phase, and a restriction groove portion. The lock groove portion includes a lock bottom surface and the restriction groove portion includes a restriction bottom surface. A second depth from an opening position of the recess portion to the restriction bottom surface is smaller than a first depth from the opening position to the lock bottom surface. The second depth from the opening position to the restriction bottom surface is smaller than a third depth from the restriction bottom surface to the lock bottom surface.

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First Claim