摘要 |
PROBLEM TO BE SOLVED: To provide a valve timing adjusting device capable of suppressing generation of striking sounds in association with unlocking originating from hydraulic pressure biting air which can be an initial motion pressure when the engine is at the starting stage and having an excellent controllability. SOLUTION: A first unlocking hydraulic chamber 18a for communicating with a retardation side hydraulic chamber 10 via a first unlocking oil path 19 is formed between a lock pin 21 and an engagement hole 18. A second unlocking hydraulic chamber 23 is formed between the lock pin 21 and a storing hole 20. Between the storing hole 20 and the retardation side hydraulic chamber 10, a second unlocking oil path 22 is formed whose communication with the second unlocking hydraulic chamber 23 is cut off by the lock pin 21 under a locking states. At the time of unlocking operation, the second unlocking oil path 22 gradually communicates with the second unlocking hydraulic chamber 23 in accordance with the retreat of the lock pin 21. A discharging path 24 for communicating with outside the device is arranged at the second unlocking hydraulic chamber 23. COPYRIGHT: (C)2003,JPO
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