| 摘要 |
In a valve timing adjusting apparatus, a locking hole 8 is formed in the external peripheral surface P of the boss of a rotor 3, into which the end portion of a locking pin 7a of the locking mechanism 7 is fitted when the rotor 3 is at the most advanced position, and in the external peripheral surface of the rotor, there is further formed a stepped portion 9 in a continuing manner from the locking hole 8 at a position deviated from the locking hole either in the advancing direction or the retarding direction in such a manner that it is formed lower than the external peripheral surface P, yet higher than the bottom of the locking hole 8, having two tapers 10, 11 respectively at the boarder between the stepped portion 9 and the external peripheral surface P, and that between the stepped portion 9 and the locking hole 8. Due to this construction, even though the rotor 3 is not cramped by the locking pin 7a during the engine-stop period, when the engine is resumed to start, the locking pin 7a is fitted into the locking hole 8 at least within one rotation of camshaft by the cam reaction force, and the rotor 3 is thus cramped at its reference position, enabling thereby an engine starting operation without causing any strange noise, a vibration and so on.
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