ADJUSTABLE VALVE MECHANISM OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To securely prevent a valve lift changing mechanism 13 and a valve timing changing mechanism 17 from lowering in action responsiveness owing to rising in oil temperature or lowering in oil pressure. SOLUTION: The mechanism is provided with the valve lift mechanism (VVL) 13 for gradually changing the valve lift amount of a suction valve and the valve timing changing mechanism (VTC) 17 for continuously changing the valve timing of the suction valve 15. When oil pressure of an oil pump 31 is lower than the set oil pressure or oil temperature is higher than the set oil temperature in an operating range to operate both VVL13 and VTC17, oil pressure supply from a VVL solenoid 11 to VVL13 is prohibited. COPYRIGHT: (C)2005,JPO&NCIPI