Patent ID: 7931000

Claim:
A valve timing controller which is provided in a drive force transmission system for transmitting drive force from a drive shaft of an internal combustion engine to a driven shaft opening/closing at least one of an intake valve and an exhaust valve to control opening/closing timing of at least one of the intake valve and the exhaust valve, comprising: a housing rotating with one of the drive shaft and the driven shaft and including a plurality of accommodation chambers in a rotational direction, each formed in the rotational direction within a predetermined angular range; a vane rotor rotating with the other of the drive shaft and the driven shaft and including a vane accommodated in the accommodation chamber to be rotated in a retard direction or an advance direction relative to the housing by a pressure of an operating fluid in a retard chamber and an advance chamber formed by dividing the accommodation chamber with the vane; a first one-way valve provided in a first advance passage for connecting a fluid supply source to the advance chamber to permit flow of the operating fluid from the fluid supply source to the advance chamber and restrict flow of operating fluid from the advance chamber to the fluid supply source; a second one-way valve provided in a first retard passage for connecting the fluid supply source to the retard chamber to permit flow of the operating fluid from the fluid supply source to the retard chamber and restrict flow of the operating fluid from the retard chamber to the fluid supply source; a first control valve provided in a second advance passage bypassing the first one-way valve to communicate the fluid supply source with the advance chamber, the first control valve being operated by a pilot pressure, which is a hydraulic pressure supplied from the fluid supply source, to close the second advance passage at the time of performing advance control for relatively rotating the vane rotor in the advance direction and to open the second advance passage at the time of performing retard control for relatively rotating the vane rotor in the retard direction; and a second control valve provided in a second retard passage bypassing the second one-way valve to communicate the fluid supply source with the retard chamber, the second control valve being operated by a pilot pressure, which is a hydraulic pressure supplied from the fluid supply source, to close the second retard passage at the time of performing retard control for relatively rotating the vane rotor in the retard direction and to open the second retard passage at the time of performing advance control for relatively rotating the vane rotor in the advance direction; and an advance/retard-switching valve for switching between a supply of an operating fluid from the fluid supply source to the retard chamber and the advance chamber and a discharge of the operating fluid from the retard chamber and the advance chamber.