Air-flow metering device for fuel injection system of internal combustion engine

An air-flow metering device for a fuel injection system of an internal combustion engine comprising;

• a retaining member fixed in an intake pipe of the engine so as not to interrupt air flowing therethrough into the engine,
• a shaft rotatably supported by said retaining member,
• a plurality of radial blades fixed to said shaft in said intake pipe, said blades having an angle of attack against a stream line of air flowing through said pipe so as to be turned by the lifting force produced by said air impinging on the blades,
• a metering plate fixed to said blades to extend outwardly therefrom, said plate having at least one cut-off portion and being adapted to turn as said blades turn;
• a disk fixed in said intake pipe adjacent said metering plate, said disk having at least one aperture therein in cooperative relationship with said cut-off portion for forming at least one air passage to said engine, said cut-off portion changing the cross sectional area of said air passage as the metering plate turns, and
• an electric turn detecting means connected with said shaft for converting the turn of said shaft into an electric signal.