Air and fuel mixing and feed system

Claim 2

In an air and fuel mixing and feed system wherein an internal combustion engine is equipped with throttle valve means and an induction manifold with said induction manifold intercommunicating downstream of said throttle valve means with said throttle valve means and said engine for said engine on negative pressure therein to take in a mixture of air and fuel from said induction manifold and be controlled by said throttle valve means, the combination which includes; venturi and duct means comprising, air inlet duct means having a passageway therein and said passageway communicating with air ambient to said engine, and with said throttle valve means and said induction manifold through a bath of liquid fuel normally contained in reservoir means of said system for a mixture of air and fuel to be supplied to said engine in response to negative pressure in said engine through said induction manifold and under control of said throttle valve means, and venturi means having an inside open region for developing static pressure in said region varying inversely in intensity with velocity of engine intake air flow induced in said region by said engine; and means for pumping liquid fuel and regulating liquid fuel flow and pressure, the latter said means comprising, pump means for being operated with said engine at a rate increasing and decreasing with operating speed of said engine for pumping liquid fuel, fuel flow regulator means including pressure responsive flow control valve means having a pressure chamber communicating with said region inside said venturi means and said pressure responsive flow control valve means communicating with a liquid fuel pressurizing chamber in said pump means and with said reservoir means, for said pressure responsive flow control valve means to open in response to static pressure being decreased in said region inside said venturi means and transmitted to said pressure chamber of said pressure responsive flow control valve means for supplying said reservoir means with liquid fuel received from said pressurizing chamber of said pump means, and for said pressure responsive flow control valve means substantially to close when static pressure in said pressure chamber of said pressure responsive flow control valve means is relatively high, and excess pressure alleviating means responsive to fluid pressure beyond a predetermined maximum pressure and communicating for responding to alleviate liquid fuel pressure in said pressurizing chamber of said pump means.

Claim 3

In an air and fuel mixing and feed system as set forth in claim 1 wherein housing and duct means includes, a housing containing said reservoir means with said air inlet duct means being in communication with air ambient to said engine and with said reservoir means in said housing, and air and fuel outlet duct means communicating with said throttle valve means and with said reservoir means, for air in response to negative pressure in said engine to enter and flow through said passageway in said air inlet duct means into and through a bath of liquid fuel in said reservoir means and pass carrying fuel through said air and fuel outlet duct means in response to negative pressure in said engine and under control of said throttle valve means.

Claim 4

In an air and fuel mixing and feed system as set forth in claim 2 wherein said air and fuel outlet means is controlled to be opened and closed by one-way check valve means opening said air and fuel outlet means in response to flow of air carrying fuel being induced from said induction manifold on operation of said engine and closing said air and fuel outlet means in response to pressure of backfire of said engine, and backfire pressure relief valve means is provided communicating with said air and fuel outlet means downstream of said one-way check valve means for relieving pressure of backfire of said engine having said one-way check valve means closed.

Claim 5

In an air and fuel mixing and feed system as set forth in claim 2 wherein said system is characterized by including filter means disposed for extracting liquid fuel from an air and fuel mixture passing en route to said engine from said reservoir means.

Claim 6

In an air and fuel mixing and feed sytem as set forth in claim 2 wherein said system is characterized by including extractor means comprising filter means and sump means disposed between said reservoir means and said induction manifold for said filter means to extract liquid fuel from an air and fuel mixture passing en route to said engine from a bath of liquid fuel normally in said reservoir means and said sump means to collect liquid fuel from said filter means, and said pump means communicates with said sump means and with said reservoir means for fuel from said sump means to be returned to said reservoir means on operation of said pump means.

Claim 7

In an air and fuel mixing and feed system as set forth in claim 2 wherein said system is characterized by including filter means disposed in said housing between said reservoir means and said induction manifold for extracting liquid fuel from an air and fuel mixture passing en route to said induction manifold from a bath of liquid fuel normally contained in said reservoir means.

Claim 8

In an air and fuel mixing and feed system as set forth in claim 2 wherein said system is characterized by including labyrinthic passage means disposed in said housing between said reservoir means and said induction manifold, and said labyrinthic passage means contains filter means for extracting liquid fuel from an air and fuel mixture passing through said labyrinthic passage means en route to said induction manifold from a bath of liquid fuel normally contained in said reservoir means.

Claim 9

In an air and fuel mixing and feed system as set forth in claim 2 wherein said system is characterized by including extractor means comprising filter means and sump means disposed in said housing between said reservoir means and said induction manifold for said filter means to extract liquid fuel from a fuel and air mixture passing en route to said induction manifold from a bath of liquid fuel normally contained in said reservoir means, and said sump means communicates with said reservoir means for liquid fuel in said sump means to be returned to said reservoir means.

Claim 10

In an air and fuel mixing and feed system as set forth in claim 8 wherein said venturi and duct means includes said venturi means intercommunicating with second ventUri means through an intermediate portion of said passageway in said duct means, and there being a feed line having feed line inlet means communicating with said sump means and having feed line outlet means in an open region inside said second venturi means for static pressure varying inversely in intensity with velocity of air flowing through said region inside said second venturi means to develop in said region inside said second venturi means and induce fuel from said sump means to flow in said feed line from said feed line inlet means to said feed line outlet means.

Claim 11

In an air and fuel mixing and feed system as set forth in claim 9 wherein said system is characterized by said extractor means including supplemental filter means and supplemental sump means interposed between said housing and said induction manifold for said supplemental filter means to extract liquid fuel from a fuel and air mixture passing en route to said engine from a bath of liquid fuel normally in said reservoir means and said supplemental sump means to collect liquid fuel from said supplemental filter means, and said pump means communicates with said reservoir means for inducing fuel to flow from said supplemental sump means and be returned to said reservoir means.

Claim 12

In an air and fuel mixing and feed system as set forth in claim 1 wherein said system is characterized by including filter means and sump means, said filter means for extracting liquid fuel from an air and fuel mixture passing en route to said induction manifold from a bath of liquid fuel normally contained in said reservoir means and said sump means to collect liquid fuel from said filter means, and said pump means communicating with said sump means and with said reservoir means for inducing fuel to flow from said sump means and be returned to said reservoir means.

Claim 13

In an air and fuel mixing and feed system as set forth in claim 1 wherein said venturi and duct means includes said venturi means intercommunicating with second venturi means through an intermediate portion of said passageway in said air inlet duct means, and said system is further characterized by including filter means and sump means, said filter means for extracting liquid fuel from an air and fuel mixture passing en route to said induction manifold from a bath of liquid fuel normally contained in said reservoir means and said sump means to collect liquid fuel from said filter means, and there being a feed line having feed line inlet means communicating with said sump means and having feed line outlet means in an open region inside said second venturi means for static pressure varying inversely with velocity of air flowing through said region inside said second venturi means to develop in said region inside said second venturi means and induce fuel from said sump means to flow in said feed line from said feed line inlet means to said feed line outlet means.

Claim 14

In an air and fuel mixing and feed system wherein an internal combustion engine is equipped with throttle valve means and an induction manifold with said induction manifold intercommunicating downstream of said throttle valve means with said throttle valve means and said engine for said engine on negative pressure therein to take in a mixture of air and fuel from said induction manifold and be controlled by said throttle valve means, the combination which includes; venturi and duct means comprising, air inlet duct means having a passageway therein and said passageway communicating with air ambient to said engine, and with said throttle valve means and said induction manifold through a bath of liquid fuel normally contained in reservoir means of said system for a mixture of air and fuel to be supplied to said engine in response to negative pressure in said engine through said induction manifold under control of said throttle valve means, and venturi means having an inside open region for developing static pressure in said region varying inversely in intensity with velocity of engine intake air flow induCed in said region by said engine; and means for pumping liquid fuel and regulating liquid fuel flow and pressure, the latter said means comprising, pump means for being operated with said engine at a rate increasing and decreasing with operating speed of said engine for pumping liquid fuel, fuel flow regulator means including pressure responsive flow control first valve means having a first pressure chamber communicating with said region inside said venturi means and said flow control first valve means communicating with said pump means and with said reservoir means, for said flow control first valve means to open to an increasing degree in response to static pressure being decreased and transmitted from said region inside said venturi means to said first pressure chamber for supplying said reservoir means with liquid fuel received from said pump means as said throttle valve means is progressively opened and substantially closed in response to relatively high static pressure transmitted from said region inside said venturi means to said first pressure chamber when said throttle valve means is in a relatively closed position and pressure responsive flow control second valve means having a second pressure chamber communicating with said induction manifold downstream of said throttle valve means and pressure responsive flow control second valve means communicating with said pump means and said reservoir means for said pressure responsive flow control second valve means to open for supplying said reservoir means with liquid fuel from said pump means in response to low pressure developed between said throttle valve and said engine having said throttle valve means in said relatively closed position and for said pressure responsive flow control second valve means substantially to close in response to relatively high pressure developed between said throttle valve means and said engine as said throttle valve means is opened, and excess pressure alleviating means responsive to fluid pressure beyond a predetermined maximum pressure and communicating for responding to alleviate liquid fuel output pressure of said pump means.

Claim 15

In an air and fuel mixing and feed system wherein an internal combustion engine is equipped with throttle valve means and an induction manifold with said induction manifold intercommunicating downstream of said throttle valve means with said throttle valve means and said engine for said engine on negative pressure therein to take in a mixture of air and fuel from said induction manifold and be controlled by said throttle valve means, the combination which includes; venturi and duct means comprising, air inlet duct means having a passageway therein and said passageway communicating with air ambient to said engine, and with said throttle valve means and said induction manifold through a bath of liquid fuel normally contained in reservoir means of said system for a mixture of air and fuel to be supplied to said engine in response to negative pressure in said engine through said induction manifold under control of said throttle valve means, and venturi means having an inside open region for developing static pressure in said region varying inversely in intensity with velocity of engine intake air flow induCed in said region by said engine; and means for pumping liquid fuel and regulating liquid fuel flow and pressure, the latter said means comprising, pump means for being operated with said engine at a rate increasing and decreasing with operating speed of said engine for pumping liquid fuel, fuel flow regulator means including pressure responsive flow control first valve means having a first pressure chamber communicating with said region inside said venturi means and said flow control first valve means communicating with said pump means and with said reservoir means, for said flow control first valve means to open to an increasing degree in response to static pressure being decreased and transmitted from said region inside said venturi means to said first pressure chamber for supplying said reservoir means with liquid fuel received from said pump means as said throttle valve means is progressively opened and substantially closed in response to relatively high static pressure transmitted from said region inside said venturi means to said first pressure chamber when said throttle valve means is in a relatively closed position and pressure responsive flow control second valve means having a second pressure chamber communicating with said induction manifold downstream of said throttle valve means and pressure responsive flow control second valve means communicating with said pump means and said reservoir means for said pressure responsive flow control second valve means to open for supplying said reservoir means with liquid fuel from said pump means in response to low pressure developed between said throttle valve and said engine having said throttle valve means in said relatively closed position and for said pressure responsive flow control second valve means substantially to close in response to relatively high pressure developed between said throttle valve means and said engine as said throttle valve means is opened, and excess pressure alleviating means responsive to fluid pressure beyond a predetermined maximum pressure and communicating for responding to alleviate liquid fuel output pressure of said pump means.

Claim 16

In an air and fuel mixing and feed system as set forth in claim 13 wherein said system is characterized by including extractor means comprising filter means and sump means, said filter means for extracting liquid fuel from an air and fuel mixture passing en route to said induction manifold from a bath of liquid fuel normally in said reservoir means and said sump means to collect liquid fuel from said filter means, and said pump means including first and second pressurizing chambers for pumping liquid fuel, said first pressurizing chamber communicating with said pressure responsive flow control first and second valve means for liquid fuel pressurized in said first pressurizing chamber to be supplied through said pressure responsive flow control first and second valve means as controlled and thence to said reservoir means, and said second pressurizing chamber communicating with said sump means and with said reservoir means for fuel from said sump means to be returned to said reservoir means.

Claim 17

In an air and fuel mixing and feed system as set forth in claim 13 wherein said venturi and duct means includes said venturi means intercommunicating with second venturi means through an intermediate portion of said passageway in said air inlet duct means, and said system is further characterized by including extractor means comprising filter means and sump means, said filter means for extracting liquid fuel from a fuel and air mixture passing en route to said induction manifold from a bath of liquid fuel normally in said reservoir means and said sump means to collect liquid fuel from said filter means, and there being a feed line having feed line inlet means communicating with said sump means and having feed line outlet means in an open region inside said second venturi means for static pressure varying inversely in intensity with velocity of air flowing through said regiOn inside said second venturi means to develop in said region inside said second venturi means and induce fuel from said sump means to flow in said feed line from said feed line inlet means to said feed line outlet means.