Carburetor for stratified charge combustion engine

Claim 1

A carburetor for a stratified charge combustion engine of the type wherein a fuel pressure control valve is provided which is adapted to change a pressure difference between the portions upstream and downstream of a metering jet in proportion to the variations of negative pressure produced at a venturi portion provided in a passage for feeding air to an associated engine and a supply of fuel passing through the metering jet is divided and respectively supplied to a diaphragm type main discharge valve and a diaphragm type auxiliary discharge valve respectively provided in a main air intake passage and an auxiliary air intake passage both of which are provided downstream of said venturi portion, the improvement comprising: valve adjustment means for causing air-fuel ratios of mixtures produced in the main air intake passage and the auxiliary air intake passage by said main and auxiliary discharge valves, respectively, to be changed in different manners by said fuel pressure control valve in response to the change of fuel pressure supplied to said main and auxiliary discharge valves, respectively, by changing the respective flow rates of fuel supplied by the main and auxiliary discharge valves in different manners while maintaining the resultant combined air-fuel ratio supplied to said engine substantially constant, thereby eliminating the need for any other fuel flow division control means.