| 摘要 |
PURPOSE:To properly control an air bleed hole provided in a jet and reduce wear out of needle by contacting the needle of a variable venturi carburetter to the jet within the region of low suction air volume and by loosely fitting them within the region of high air volume. CONSTITUTION:A piston 1 is installed inside a suction chamber 14 of a carburetter 10. The end of the piston 1 is connected to a metering neddle 5. The piston 1 makes a sliding motion inside the chamber 14 in proportion to the negative pressure in a venturi member 6. The needle 5 makes a sliding motion, partially in contact with a jet 8 by a projection 22 inside a holder 3', and adjusts an air bleed hole 34 bored in the jet 8. At expansion member 27 is fastened to the end of the needle 8, and moves inside a large-sized member 31 and a small-sized member 30 of a well 26. As the expansion member 27 contacts the small-sized member 30 within the region of high air volume, the needle 5 and the jet 8 are loosely fitted, thereby increasing the opening area of the bleed hole 34.
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