Patent ID: 6868812
Filing Date: 2005-03-22
Classification: F01L

Abstract:
1. A valve timing control system for an internal combustion engine comprising: a drive force transmitter driven by means of a crank shaft of the internal combustion engine; a cam shaft having an external periphery which is formed with a drive cam for operating a valve of the internal combustion engine, the cam shaft being so fitted with the drive force transmitter as to rotate the drive force transmitter relative to the cam shaft when so required, the cam shaft being a follower which is rotated with a drive force transmitted from the drive force transmitter; a housing rotating integrally with one of the drive force transmitter and the cam shaft; a vane rotor housed in the housing, and rotating integrally with the other of the drive force transmitter and the cam shaft; an advanced angle chamber and a delayed angle chamber disposed in the housing, and rotating the vane rotor with an oil pressure; an oil pressure conveyer communicating to the advanced angle chamber and the delayed angle chamber, the oil pressure conveyer supplying the oil pressure selectively to one of the advanced angle chamber and the delayed angle chamber while draining the oil pressure selectively from the other of the advanced angle chamber and the delayed angle chamber; a protrusion shaft formed on at least one of the vane rotor and the housing, the protrusion shaft protruding forward; a target plate mounted on at least the one of the vane rotor and the housing, the target plate being formed substantially flat and fitted to the protrusion shaft; and a sensor disposed in a vicinity of the target plate, the sensor detecting a rotational angle of the target plate, wherein a supply-drain passage shaft is fixedly disposed in the internal combustion engine, the supply-drain passage shaft being for supplying an operation oil to the advanced angle chamber and for draining the operation oil from the advanced angle chamber, and the supply-drain passage shaft being for supplying the operation oil to the delayed angle chamber and for draining the operation oil from the delayed angle chamber; a connection hole is defined from a head end of the protrusion shaft disposed on the vane rotor to substantially a center of a shell section of the vane rotor; the supply-drain passage shaft is so inserted into the connection hole as to rotate relative to the connection hole; and a seal ring is disposed between the connection hole and the supply-drain passage shaft.