Patent ID: 8651077

Claim:
A fluid-pressure-operated valve timing controller controlling a valve timing of a valve opened and closed by a torque transmitted to a camshaft from a crankshaft of an internal combustion engine using working fluid, the valve timing controller comprising: an outer rotor rotating with the crankshaft; an inner rotor rotating with the camshaft, the inner rotor partitioning an inside space of the outer rotor into a plurality of working chambers in a circumference direction, the inner rotor slidably rotating in the circumference direction relative to the outer rotor using a flow of the working fluid relative to the working chambers; and a spiral spring constructed by an element wire spirally extending, the element wire having a most outer circumference part supported by the outer rotor at a first position and a most inner circumference part supported by the inner rotor at a second position, the circumference direction having a deformation direction and a biasing direction opposite from each other, wherein the spiral spring has a twisting deformation when the inner rotor slidably rotates in the deformation direction relative to the outer rotor, the spiral spring biases the inner rotor in the biasing direction relative to the outer rotor when the spiral spring has the twisting deformation, the spiral spring has a bent part bent to protrude in a radial direction between the first position and the second position, and the bent part of the spiral spring is linearly contact with a part of the element wire located adjacent to the bent part in the radial direction.