| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve system of a four-cycle engine to provide optimum engine performance by continuously changing a lift amount and the closing timing of a valve through simple constitution. SOLUTION: In a valve system 20 of a four-cycle engine wherein a valve 6 is opened and closed by transmitting a lift of a cam 14a, formed at a rotationally driven cam shaft 14, to a valve 6 through a locker arm, the locker arm consists of locker arms 21 and 22 in two stages making contact with each other for oscillation and the locker shaft (an oscillation shaft) 30 of at least one locker arm 21 is brought into a displaceable state and a lift amount and the opening and closing timing of the valve 6 are continuously changeable. In this invention, by displacing the locker shaft 30 of at least one (the locker arm 21) of the locker arms 21 and 22 in two stages, a lift amount and the closing timing of the valve 6 are continuously changed, whereby a plurality of cams and switching means are not needed, a need for a complicated mechanism and a variable timing device required for control is also eliminated, and optimum engine performance is obtained through simple constitution.
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