Patent ID: 7165521

Claim:
A variable valve timing control device for controlling an opening and closing timing of an intake valve and an exhaust valve comprising: a rotational shaft rotatably assembled to a cylinder head of an internal combustion engine; a rotation transmitting member assembled around the rotational shaft so as to rotate relative thereto within a predetermined range and receiving a rotational force from a crank shaft; a vane assembled to either one of the rotational shaft or the rotation transmitting member; a fluid pressure chamber disposed between the rotational shaft and the rotation transmitting member and divided into a retarded angle chamber and an advanced angle chamber by the vane; a fluid passage through which an operation fluid is selectively supplied to or discharged from the advanced angle chamber or the retarded angle chamber; and a torsion coil spring for constantly biasing the rotational shaft to an advanced angle direction relative to the rotation transmitting member; wherein the rotational shaft and the rotation transmitting member possess contact portions facing each other in an axial direction; and the torsion coil spring is disposed between the rotational shaft and the rotation transmitting member under condition that one end of the torsion coil spring engages the rotational shaft and another end of the torsion coil spring engages the rotation transmitting member, while the torsion spring is axially compressed to a predetermined length from a free length so as to generate a force in a direction urging the contact portions of the rotational shaft and the rotation transmitting member away from one another.