Carburetor system for outdoor power equipment

摘要

A carburetor includes a passageway having a constricted section, a nozzle directed into the passageway proximate the constricted section, and a shaft having a surface that at least partially defines the constricted section. The nozzle is configured to deliver fuel to air passing through the passageway, and the surface includes a contour that is configured to be moved relative to the passageway to change the area of the passageway through the constricted section.

主权项

1. An engine, comprising:
a fuel tank; a well configured to hold fuel delivered from the fuel tank; an air intake; a combustion chamber; a passageway configured to channel air from the air intake to the combustion chamber, wherein the passageway comprises a surface at least partially defining a constricted section of the passageway, and wherein the surface is configured to be adjusted to change the area of the passageway through the constricted section; a nozzle in fluid communication with the well and directed into the passageway proximate to the constricted section, whereby the constricted section of the passageway provides a relative low pressure in air passing through the passageway that draws fuel from the nozzle to the air; a vent configured to connect the well with outside air; and a variable restrictor configured to limit the connection provided by the vent between the well and outside air, wherein the degree of restriction provided by the variable restrictor is a function of the area of the constricted section of the passageway.