| 摘要 |
In order to obviate the drawbacks of fluid-dynamic character which affect the traditional carburettors equipped with control valves of throttle or of guillotine type, the carburation device (1, 1A, 1B, 1C) provides for the feed duct (6, 6A-6C) to be a tubular portion made of an elastic material constrained at its ends and that at least one pair of relatively movable blades (10) act on said elastic feed duct (6, 6A-6C) on its outer surface, squeezing it in a perpendicular direction relatively to its axis (8). The surface area of the cross-section of the inner bore of said duct (6, 6A-6C) varies taking (relatively to the fuel stream flowing through it) a gradually convergent-divergent shape, i.e., without sharp changes in said inner bore cross-section surface area, and the fuel stream has hence a fluid-dynamically optimal motion independently from the actual revolution speed of the engine.
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