| 摘要 |
<p>A valve opening/closing timing control device, comprising a first rotating body rotating together with the camshaft of an internal combustion engine, a second rotating body rotating together with a crankshaft and rotatable relative to the first rotating body, a control means changing a relative rotation phase between the first rotating body and the second rotating body, and a torsion coil spring energizing the first rotating body in a direction for advancing it relative to the second rotating body. The torsion coil spring (20) comprises locking parts locked to the first and second rotating bodies (1) and (2) and a coil part (22) positioned between the both locking parts. The coil part (22) comprises a pair of holding areas (23a) and (23b) capable of positioning the coil part (22) on the peripheral surfaces of the rotating bodies (1) and (2) and a torque generating area (25) positioned between the pair of holding areas. The winding diameters of the coil part in the holding area and the torque generating area are differentiated from each other. Thus, it can be avoided that a frictional resistance occurs between the coil part of the torsion coil spring and the rotating bodies and the specified spring force of the torsion coil spring cannot be developed.</p> |
