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Japanese Patent JP4511537

B2

A carburettor is connected into the inlet duct ( 48 ) of an internal combustion engine. The inlet duct is divided by a dividing wall ( 64 ) into a rich passage ( 42 ) and a lean passage ( 44 ). The carburettor includes a fuel chamber ( 4 ) and defines a flow duct divided by a planar partition ( 66 ) into a rich duct ( 30 ) and a lean duct ( 32 ) which communicate with the rich and lean passages, respectively. The partition ( 66 ) defines an aperture ( 40 ) in which a planar butterfly valve ( 20 ) is pivotably mounted. A number of fuel supply orifices ( 61, 62 ) communicate with the fuel chamber ( 4 ) and with the duct ( 30 ) at a position opposite to the aperture ( 40 ). The butterfly valve ( 20 ) is pivotable between an open position, in which the flow duct is substantially open and the aperture ( 40 ) is substantially closed and all of the fuel flowing out of the fuel supply orifices ( 61, 62 ) flows into the rich duct ( 30 ), and a closed position, in which the flow duct is substantially closed and the aperture ( 40 ) is substantially open and the fuel flowing out of the fuel supply orifices flows into to both the rich and lean ducts. An idle fuel supply orifice ( 8 ) is provided in the dividing wall ( 64 ) and communicates with the rich and lean passages ( 42, 44 ) and with the fuel chamber ( 4 ) and with the atmosphere. Under idling operation of the engine, an air/fuel mixture is induced into the rich and lean passages not only through one of the fuel supply orifices ( 61 ) but also through the idle fuel supply orifice ( 8 ).

Grover, stephan, brian
Maurice, Stephan

JP2006526694A

July 28, 2010

September 16, 2004

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Ricardo U.K. Limited

F02M11/00; F02B25/22; F02M3/12; F02M3/14; F02M13/04; F02B75/02

JP2003193911A
JP2001295652A
JP2002514708A
JP2003074352A

Hisao Kobayashi
Kiyoshi Yasushima
Souji Sasaki
Noboru Omura
Takanashi Norio

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