Fuel injection device for injection carburetors
AssigneeMikuni Kogyo Kabushiki Kaisha
InventorsTetsuo Muraji, Mitsuru Sekiya
Life of this patent
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Abstract
The fuel injection device for injection carburetors is provided with a single fuel control unit for injecting a fuel into a suction tube in quantities corresponding to flow rates of air to be drawn into the suction tube, a slow negative pressure passage communicating with a depression chamber of the fuel control unit, a diaphragm valve for opening a main negative pressure passage to communicate the depression chamber with the main negative pressure passage when the air suction rate exceeds a predetermined value, and another diaphragm valve operable to close a slow jet and open a main jet when the air suction rate exceeds the predetermined value. This fuel injection device is simple in the structure thereof, manufacturable at a low cost and has high fuel control accuracy.
Claims6
A fuel injection device for injection carburetors comprising:
- a single fuel control for injecting a fuel into a suction tube in quantities corresponding to flow rates of air drawn into the suction tube;
- a slow air flow rate detecting means communicating with said suction tube;
- a main air flow rate detecting means communicating with said suction tube;
- a slow fuel metering means;
- a main fuel metering means;
- said fuel control unit including an air section of a regulator consisting of a depression chamber and an atmospheric chamber separated from each other by a first diaphragm, said depression chamber being communicable with said slow and main air flow rate detecting means, and said atmospheric chamber communicating with the atmosphere;
- said fuel control unit including a fuel section of said regulator consisting of a fuel pressure chamber and a fuel injection chamber separated from each other by a second diaphragm and communicable with each other through said slow and main fuel metering means, said fuel pressure chamber being communicable with a fuel supply source, and said fuel injection chamber having a fuel injection port communicating with said suction tube;
- said fuel control unit including a connecting member connected to said first diaphragm and said second diaphragm, and provided with a fuel injection valve operable to open and close said fuel injection port;
- said fuel control unit including a first means operable for biasing said connecting member so that said fuel injection valve will be biased in an open condition relative to said fuel injection port, and a second means having a biasing rate greater than that of said first biasing means operable for biasing said connecting member so that said fuel injection valve will be biased in a closed condition relative to said fuel injection port;
- and
- switching means operatively connected to said slow and main airflow rate detecting means and said slow and main fuel metering means, for rendering effective said main air flow rate metering means and said main fuel metering means when said air flow exceeds a predetermined value.
Dependencies are inferred from the claim text.