| 摘要 |
In an intake valve timing control apparatus, a lock member is arranged to lock a vane rotor with respect to a housing when the vane rotor is in a most retarded position within which rotation of the vane rotor is restricted by a stopper mechanism. In an exhaust valve timing control apparatus, a lock member is arranged to lock a vane rotor with respect to a housing when the vane rotor is in a most advanced position within which rotation of the vane rotor is restricted by a stopper mechanism. The exhaust valve timing control apparatus further includes a biasing member arranged to bias the vane rotor with respect to the housing in a direction toward the most advanced position. In each valve timing control apparatus, a housing body of the housing and a vane rotor are formed by extruding an aluminum-based metal.
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