Patent ID: 6481699
Filing Date: 2002-11-19
Classification: F02B,F02M

Abstract:
An acceleration device of a carburetor for a two cycle engine comprising:a carburetor body having an air intake passage and a separate scavenging passage; a fuel supply port in communication with the air intake passage; a metering fuel chamber carried by the carburetor body and communicating with the air intake passage through the fuel port; a first housing portion having an actuation chamber communicating with the scavenging passage; a membrane disposed operatively between the fuel metering chamber and the actuation chamber, the actuation chamber defined by the first housing portion and the membrane; and a resilient member engaged with the membrane and constructed and arranged to resist the forces produced by negative pressure within the actuation chamber exerted upon the membrane, the metering fuel chamber constructed and arranged to supply fuel to the air intake passage via the fuel supply port, wherein the fuel is supplied to the fuel port by suction from the air intake passage during steady-state operation of the engine and by expansion of the actuation chamber by outward movement of the membrane from the first housing portion during acceleration of the engine causing fuel to be discharged from the fuel metering chamber into the air intake passage through the fuel supply port.