Patent ID: 6374788
Filing Date: 2002-04-23
Classification: F01L

Abstract:
A valve timing control device, comprising:a first rotor rotating in synchronization with a crankshaft of an internal combustion engine, the first rotor having a plurality of shoes inside thereof; a second rotor fixed on an end of an intake camshaft or an exhaust camshaft of the internal combustion engine and rotatably arranged in the first rotor, the second rotor having a plurality of vanes on the outside; an advance side oil hydraulic pressure chamber and a retardation side oil hydraulic pressure chamber defined between the vanes of the second rotor and the shoes of the first rotor; a lock member locking the first and second rotors at a required angle which any one of the rotors forms with the other; an accommodation hole arranged at the second rotor, accommodating the lock member and biasing member for biasing the lock member, the accommodation hole having a discharge hole for discharging backward pressure of the lock member; an engagement hole arranged at the first rotor, allowing insertion of the lock member, the engagement hole having a release oil hydraulic supply path for supplying release oil pressure; an advance side pressure partition path communicating with the advance side oil hydraulic pressure chamber; a retardation side pressure partition path communicating with the retardation side oil hydraulic pressure chamber; and a purge path communicating at least one of the advance side oil hydraulic pressure chamber, the retardation side oil hydraulic pressure chamber, the advance side pressure partition path and the retardation side pressure partition path with ambient air.