Carburetor with fuel vapor control
AssigneeWalbro Corporation
InventorWilliam E. Galka
Life of this patent
Estimating the term…
Abstract
A carburetor having a plurality of restricted fluid flow paths upstream of a fuel and air mixing passage to inhibit the passage of large fuel vapor bubbles through the fuel paths and to the fuel and air mixing passage. Desirably, the restricted flow paths constrain large volume vapor bubbles and clusters of bubbles from passing therethrough undistributed in the fuel to prevent an inconsistent or overly lean fuel and air mixture from being delivered to the engine. At least two restrictive flow paths diffuse, separate, and/or break up the large vapor bubbles and clusters into a plurality of smaller vapor bubbles which are more uniformly distributed within the liquid fuel flowing through the carburetor to provide a more consistent flow of fuel to the engine.
Claims20
A carburetor for an engine, comprising:
- a body having a fuel and air mixing passage therethrough at least one nozzle opening into the air mixing passage and configured to discharge fuel into the air mixing passage, a metering chamber defined at least in part in the body, having an inlet in communication with a supply of fuel, and an outlet defined by a plurality of separate holes in the body upstream of all of the nozzles and through the nozzles in communication with the fuel and air mixing passage and positioned within the body at a location to which fuel vapor normally collects at least when the body is in its normal operating position so that fuel vapor and liquid fuel in the metering chamber are drawn from the metering chamber through at least one of said plurality of holes for delivery through at least one nozzle to the fuel and air mixing passage, and the plurality of holes have a combined flow area sufficient to enable the carburetor to satisfy the maximum fuel demand of the engine and no single one of the plurality of holes has an area sufficient to enable the carburetor to satisfy the maximum fuel demand of the engine and each hole has an area small enough to inhibit the passage of large vapor bubbles and clusters of bubbles downstream thereof and to break them into smaller bubbles which pass through the hole and are discharged with liquid fuel through at least one of the nozzles into the fuel and air mixing passage of the carburetor.
Dependencies are inferred from the claim text.