Patent ID: 7503294

Claim:
A valve opening/closing timing controlling apparatus, comprising: a housing member rotatable together with a drive member for transmitting a drive force; a rotor member rotatably assembled with the housing member, a vane portion of the rotor member forming, within said housing member, a phase-advanced oil chamber and a phase-lagged oil chamber, the rotor member being rotatable together with a cam shaft; a torsion coil spring for urging the rotor member relative to the housing member in a phase advancing direction; and a hydraulic circuit for controlling feeding/discharging of work oil to or from said phase-advanced oil chamber or said phase-lagged oil chamber, wherein said torsion coil spring has one end thereof fixed to said housing member and the other end thereof fixed to a projection provided on said rotor member, wherein the other end of the torsion coil spring is retained in a retaining groove defined in said projection of the rotor member, and wherein the other end of the torsion coil spring is clamped between the retaining groove provided in the rotor member and a positioning pin inserted in the retaining groove for positioning the rotor member relative to the cam shaft.