| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic valve system in which a pressure oil amount required for driving intake and exhaust valves is reduced as small as possible and an amount of energy required for the driving is reduced to reduce power loss of an engine. SOLUTION: The hydraulic valve system for driving the intake and exhaust valves of an internal combustion engine, comprises: a pressure chamber 4, which is formed at a time of closing a valve 2 of the intake valve or the exhaust valve, and of which pressure receiving face 9 is a rear end face of the valve; a low pressure hydraulic cylinder 3 connected with the pressure chamber at a time of opening the valve and moving the valve by a predetermined amount; an oil pressure supply system supplying the pressure oil to the pressure chamber at the time of opening the valve; a spring 14 to emergize the valve in the opening direction. When the valve opens, the pressure oil is supplied from the oil pressure supply system to the pressure chamber to apply kinetic energy to the valve in the valve opening direction until the pressure chamber is connected to the hydraulic cylinder. After that, movement of the valve in the opening direction is continued by inertia force.
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