VALVE OPENING/CLOSING TIMING CONTROL DEVICE

摘要

Provide is a valve timing control device including a projecting and retracting mechanism having high abrasion resistance and capable of reducing a linking force. The valve timing control device includes a lock mechanism having a hole portion formed in one of the driving-side rotational member and the driven-side rotational member, a sleeve accommodated in the hole portion, a lock member accommodated in the sleeve and capable of projecting and retracting with respect to the other of the driving-side rotational member and the driven-side rotational member, and a lock hole formed in the other of the driving-side rotational member and the driven-side rotational member such that the lock member can be fitted to the lock hole when the lock member projects, the lock mechanism constraining a relative rotational phase of the driven-side rotational member with respect to the driving-side rotational member at a predetermined phase when the lock member is fitted to the lock hole. A first chamfered surface is formed in the circumferential direction at an inner-circumferential corner of an end of the sleeve on the side opposite to the side facing the lock hole.