VALVE SYSTEM FOR INTERNAL COMBUSTION ENGINE

摘要

PURPOSE:To carry out oil supply to a valve operation mode change means speedily upon start-up of engine by connecting an oil pump exclusively for a cylinder head to the hydraulic oil chamber of the means. CONSTITUTION:Between an engine valve V supported on a cylinder head 9 to open or close freely and a crank shaft, there is provided a valve operation mode change means 15 capable of changing operation mode of the valve V in response to change in oil pressure in a hydraulic chamber 31. To the chamber 31 is connected an oil pump Pc arranged exclusively for the head 9 to suck up working oil from an oil bath at the head 9. It is thus possible to relatively reduce the distance between the pump Pc and the chamber 31 to provide opera tion delay of the means 15 upon start-up of engine.