Patent ID: 8171903

Claim:
An intermediate lock pin (ILP) type variable valve timing unit comprising: an ILP type stator having at least one chamber formed therein, wherein the chamber is defined between partition walls formed in an inner circumference of a stator body; a rotor including a vane and accommodated in the chamber to rotate relatively between the partition walls of the stator; and a locking maintaining portion provided in the chamber and configured to selectively lock the rotor to the stator so as to maintain locking of the stator and the rotor when an engine stops working; wherein the lock maintaining portion comprises: a guide projection formed to extend from the rotor, and provided with a locking hole formed on one side thereof; a guide groove formed on the stator to receive the guide projection therein and guide the guide projection; and a locking projection formed at an end portion of the guide groove to be selectively locked into the locking hole when the engine stops working, wherein a circumferential thickness between the locking projection and a distal end portion of the vane is shorter than a circumferential distance between the locking groove and the partition wall of the stator to prevent the vane from bumping against the partition wall of the stator.