US 4,670,194 A · Carburetor

Abstract

A carburetor including a fuel inlet and first air inlet delivering fuel and air to a location at which they are intermixed, and from which they flow toward an outlet of the device, with additional air being introduced into the stream through a second air inlet at a location downstream of the fuel inlet and the first air inlet. A fuel metering valve may deliver fuel to the fuel inlet in precisely measured fashion, with the fuel being supplied to the metering valve by a pressure regulator. The second air inlet may include an air valve assembly having sleeves with apertured side walls which are relatively rotatable to vary the rate of delivery of air through that valve assembly. Full vaporization of the fuel may be enhanced by introduction of air into the stream or streams of intermixed fuel and air at other locations along a circuitous path or paths followed by the fuel air mixture. The mixture may be directed through tapering passages acting to increase the velocity of the mixture to a maximum velocity point at which some of the additional air is injected laterally into the stream. Automatic control mechanism responsive to engine vacuum and to a temperature actuated element functions to maintain the pressure of the fuel delivered to a fairly high value during starting of the engine and until it reaches a predetermined operating temperature, at which time the pressure automatically reduces to a lower operating value.

Claims30

Dependent claims

A carburetor comprising:

a housing structure;
a fuel metering valve for delivering fuel at a controllably variable rate to flow along a predetermined path or paths within said housing structure for delivery to an engine, and including a metering element movable to progressively increase the rate of fuel delivery;
a pressure regulator controlling the pressure of fuel delivered to said metering valve;
a first air inlet for introducing air at a location to intermix with fuel from said metering valve;
means downstream of said fuel metering valve and said first air inlet for directing the intermixed air and fuel along a non linear path or paths of abruptly changing direction;
additional air inlet means for introducing air into said fuel metering valve and at a location or locations along said non linear path or paths;
an essentially tubular air valve through which said intermixed air and fuel flows downstream of said non linear path or paths and comprising valve sleeves disposed one about the other and containing wall apertures movable into and out of registry to progressively regulate the admission of additional air laterally into the flow of intermixed fuel and air;
and
linkage connecting said fuel metering valve and said air valve together for actuation in unison.

6 more elements

A carburetor comprising:

a housing structure;
a fuel metering valve for introducing fuel to said housing structure at a location to mix with air for delivery to an engine;
said metering valve including a valve element movable in a predetermined direction to increase the rate of delivery of fuel through the valve for acceleration of the engine;
means for limiting opening movement of said valve element in said predetermined direction during starting of the engine;
and
additional means automatically responsive to an increase in engine vacuum to release said first mentioned means and permit increased opening movement of said valve element after the engine has been started.

3 more elements

A carburetor comprising:

a fuel metering valve including a first valve element movable linearly along a first axis to vary the rate of delivery of fuel to a flow of air for mixture therewith;
an air valve including a second valve element movable rotatively about a second axis to vary the rate of air flow;
a lever connected to said second valve element for rotary movement therewith about said second axis and for pivotal movement relative thereto about a third axis extending essentially parallel to said second axis;
a connection between said lever and said first valve element for converting rotary motion of said second valve element and said lever about said second axis to linear movement of said first valve element along said first axis, and which connection is movable toward and away from said second axis by pivotal movement of said lever to vary the amount of linear movement of said first element upon a predetermined amount of rotary movemet of said second element about said second axis;
and
means for releasably retaining said lever in different pivotal positions about said third axis.

3 more elements

A carbueretor comprising:

a housing structure;
a fuel inlet delivering liquid fuel at a location to flow along a path or paths within said housing structure and toward an outlet;
first air inlet means for delivering a flow of air to said fuel from said fuel inlet to intermix therewith and flow along said path or paths therewith;
second air inlet means for delivering additional air to said intermixed fuel and air from said fuel inlet and said first air inlet means at a location downstream of said fuel inlet and said first air inlet means;
a tapering passage downstream of said fuel inlet and said first air inlet means through which the intermixed fuel and air are directed to increase in velocity;
said second air inlet means including a plurality of air passages extending generally radially inwardly for introducing air near the downstream end of said tapering passage;
a plurality of passages downstream of said second air inlet means directing intermixed air and fuel generally radially outwardly;
a plurality of additional tapering passages at circularly spaced locations receiving air and fuel from said last mentioned passages for flow through said additional tapering passages at progressively increasing velocity;
and
third air inlet means delivering additional air to the intermixed air and fuel near the downsream end of said additional tapering passages for intermixture therewith.

7 more elements

Dependencies are inferred from the claim text.

Carburetor

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Carburetor

Life of this patent

Abstract

Claims30