Patent ID: 6837200

Claim:
A system for controlling a valve timing in an internal combustion engine, comprising: a driving rotator rotated by a crankshaft of the engine; a driven rotator provided to a camshaft of the engine, the driven rotator having the driving rotator mounted to produce relative rotation; a first device which changes a mounting angle between the driving rotator and the driven rotator through relative rotation thereof, the first device comprising first and second rotating mechanisms coupled to each other in series, each rotating mechanism having a rotation range restricted at a predetermined angle; and a second device which locks the first device at a mounting-angle position suitable for engine start, the mounting-angle position being set between a most-lagged-angle position and a most-advanced-angle position, the second device comprising a first lock mechanism which locks the first rotating mechanism at one of the most-lagged-angle position and the most-advanced-angle position and a second lock mechanism which locks the second rotating mechanism at another of the most-lagged-angle position and the most-advanced-angle position, the first and second rotating mechanisms being locked by the first and second lock mechanisms at opposite positions to maintain the mounting angle at the mounting-angle position suitable for engine start.