Rotary throttle valve carburetor
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United States of America Patent
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-
Oct 3, 2006
Grant Date -
Dec 16, 2004
app pub date -
Jun 3, 2004
filing date -
Jun 12, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary throttle valve carburetor includes a body having a fuel and air mixing passage and a throttle valve movable between idle and wide open positions. A valve bore is increasingly aligned with the fuel and air mixing passage as the throttle valve is moved from idle toward its wide open position. A fuel metering needle is responsive to movement of the throttle valve so that the needle moves relative to the body in response to movement of the throttle valve. A fuel nozzle extends into the valve bore, is associated with the fuel metering needle, and has a fuel ejection passage with an effective flow area controlled by movement of the fuel metering needle relative to the fuel nozzle and includes a portion with a cross-sectional area that gradually increases in the direction of fuel metering needle movement corresponding to throttle valve movement toward its wide open position.
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