Patent ID: 6880505

Claim:
A valve timing control system comprising a valve timing control device including: a first rotor unit connected to an output shaft of an internal combustion engine, rotating together with the output shaft, having a plurality of inner-side protrusions that forms hydraulic pressure chambers between the protrusions; a second rotor unit having a plurality of vanes that divides each of the protrusion hydraulic chambers into an advance-angle hydraulic pressure chamber and a retard-angle hydraulic pressure chamber, inserted into the first rotor unit so as to be moveable through a given angle, and fixed integrally to a drive shaft for driving at least one of an inlet valve or an exhaust valve of the internal combustion engine; a regulator member, housed slideably in one of either the first or the second rotor unit, for regulating the relative turning of the first rotor unit and the second rotor unit by engaging-aperture engagement; an engaging aperture, provided in the other of either the first or the second rotor unit, for engaging with the regulator when the first rotor unit is in a given position relative to the second rotor unit; wherein regulation or release of the relative turning position of the valve timing control device by the regulator is controlled by an external device distinct from the valve timing control device.