| 摘要 |
PURPOSE:To obtain the stable faculty by preventing vibration by forming a jet needle which is installed into a piston for varying the sectional area of a venturi and inserted into a main nozzle, into a hollow pipe form and allowing fuel to pass inside. CONSTITUTION:A jet needle 1 is installed into a piston for varying the sectional area of a venturi and inserted into a main nozzle. In this case, the jet needle 1 is formed into a hollow pipe form, and allows fuel to pass inside. The needle body is formed into straight form (equal outside diameter), and closely attached in slidable ways into the inside diameter of the jet needle, and the stable faculty can be obtained, preventing the vibration in the longitudinal and lateral directions. Further, an opened port part 2 for the fuel injection is formed only on the downstream side of the intake stream in the jet needle 1. Therefore, the stable fuel injection is permitted even in the slow speed region in the downstream part where the max. negative pressure is generated.
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