Abstract: A valve timing control device has a lock pin for controlling the rotation between first and second rotors. A purge valve is arranged at the lock pin, the purge valve discharging air-mixing oil into a discharge hole in a release operation. On application of first pressure of release hydraulic pressure, a part of the first pressure is discharged through the purge valve, a backward pressure chamber and the discharge hole to the outside the device. Therefore, the lock pin is slid to reduce applied pressure, and it can delay a release operation to prevent the occurrence of beat noise on starting an engine.

Abstract: A valve timing control device has a purge path arranged at a vane of a rotor provided with a valve. The purge path communicates a retardation side oil hydraulic pressure chamber with an accommodation hole. Oil pressure in the retardation side oil hydraulic pressure chamber is supplied through the purge path to the accommodation hole to generate oil pressure acting to delay a release operation.

Abstract: A valve timing adjusting apparatus of an internal combustion engine in which number of lock pins is decreased is provided.