| 摘要 |
PROBLEM TO BE SOLVED: To stably keep the fuel amount by restraining vibration of a tip needle caused by backlash of a screwing part of a fuel adjusting needle valve and preventing air from leaking from a clearance of the screwing part of the fuel adjusting needle valve. SOLUTION: First cylindrical parts 6 having the inside diameter gradually decreased inward from the wall surface of a carburetor main body 1, second cylindrical parts 6, conical parts 9, valve chambers 4, and outlet passages 3 are coaxially provided. Tip side small-diameter cylindrical parts 20 of stepped holders 19 made of synthetic resin are fitted to the valve chambers 4, conical parts of the stepped holders 19 are pressed against the conical parts 9, and large-diameter cylindrical parts 21 of the stepped holders 19 are pressed in the second cylindrical part 6. Screw holders 25 made of synthetic resin are pressed in the first cylindrical parts 6. Screw shaft parts 15, shaft parts 14, stems 13 and tip needles 12 which have the outside diameter gradually decreased from head parts 16 to the tips are formed on a fuel adjusting needle valve 10, the tip needles 12 are inserted into the outlet passages 3, the stems 13 are pressed in the small-diameter cylindrical parts 20 of the stepped holders 19, the shaft parts 14 are pressed in the large-diameter cylindrical parts 21 of the stepped holders 19, and the screw shaft parts 15 are screwed to the screw holders 25.
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