| 摘要 |
PROBLEM TO BE SOLVED: To reduce the size of a variable venturi carburetor by reasonably forming its piston valve, shortening its intake passage and reducing the diameter of its diaphragm. SOLUTION: A piston valve 12 is constituted of a platelike valve part 26 adapted to slidably engage with vertical guide grooves 25 formed in both left and right inner walls of a venturi part 3, and a hollow negatiye-pressure induction tube part 27 integrated with the valve part 26 at the center thereof so as to have a square section of which sides are shorter than the inside diameter D of the venturi part 3. At the upper end of the valve part 26 and the negative- pressure induction tube part 27 is arranged a flange 13 comprising a disk part 13a of a diameter (d) shorter than the breadth A of the valve part 26 and an extension part 13b extending from the outer circumference of the disk part 13a to the side edge of the valve part 26 continuously. The disk part 13a and a retainer ring 36 hold the inner circumferential end of a diaphragm 16 therebetween.
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