Patent ID: 6994062

Claim:
A variable valve timing control device comprising: a rotor member integrally connected to either one of a camshaft and a crankshaft for opening and closing a valve, either one of the camshaft and the crankshaft being rotatably assembled to a cylinder head of an internal combustion engine; a housing member connected to either one of the crankshaft and the camshaft via a driving force transmitting member and assembled to the rotor member so as to be rotatable relative thereto; a vane provided on either one of the rotor member and the housing member; a fluid pressure chamber formed between the rotor member and the housing member and divided into an advanced angle chamber and a retarded angle chamber by the vane; and a sensor wheel assembled to either one of the rotor member and the housing member and including a projecting portion for detecting a rotational angle of the rotor member or the housing member by using a sensor provided adjacent to the sensor wheel; wherein the sensor wheel includes at least one reference hole for determining a position of the projecting portion in a circumferential direction of the sensor wheel.