| 摘要 |
PROBLEM TO BE SOLVED: To provide a vaporizer for a two-stroke internal combustion engine capable of preventing suction of unburnt fuel to an air passage without increasing the number of components while keeping air-tightness.SOLUTION: In a vaporizer for a two-stroke internal combustion engine which includes a bottomed cylindrical valve hole formed at an approximate central portion of a vaporizer body, and a rotary valve to which a cylindrical portion having a diameter almost the same as that of a valve hole is rotatably fitted, and in which the rotary valve is disposed while vertically crossing a fuel intake passage and an air passage formed on the vaporizer body in almost parallel with each other, and a fuel supply-side bore for controlling a flow rate of the fuel intake passage and an air supply-side bore for controlling an amount of air in the air passage are formed while penetrating through a part of the cylindrical portion in the direction at a right angle to an axial direction of the rotary valve, an annular recessed portion is formed on a part of an outer peripheral wall of the cylindrical portion of the rotary valve so as not in contact with at least opening portions of the fuel supply-side bore and the air supply-side bore. |
