| 摘要 |
PURPOSE: To easily control, regulate an engine with a simple device by constituting a one way valve that has a adjustable open critical value in a suction passage of upper stream side of suction valve for an engine equipped with a valve that is released with a delay to the suction valve. CONSTITUTION: While arranging a suction valve 16 controlled in connection to crank angle in an end, open to a combustion chamber 10, of a suction passage 14 that supplies combustion air or mixed gas to the combustion chamber 10, another valve 22 is arranged at upper stream side of the suction valve 16 in the suction passage 14. In this case, the valve 22 has a reverse motion stop flap 26 that is freely rotatable about a shaft 24, and the reverse motion stop flap 26 is pressed to the close direction by a spring 28. And the reverse motion stop flap 26 contacts to a stopper face 30 that positions at an opening 32 of a negative guide pipe 34, release force of the valve 22 can be regulated by regulating the opening degree of a regulation valve 36 arranged in the negative guide pipe 34, and the regulation valve 36 is changeable, for example, corresponding to the operation condition of the engine.
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