Air valve pressure diaphragm carburetor

Claim 2

In a carburetor, an air intake passage, a throttle valve controlling said air intake passage, a fuel passage leading into said air intake passage, an air valve in said air intake passage upstream from said throttle valve, and yieldable means urging said air valve to closed position, said air valve being adapted to open against the action of said yieldable means in response to vacuum in said air intake passage, said yieldable means including a rod connected to said throttle valve, a pin having a lostmotion connection with said air valve, spring means between said rod and pin, and means for adjusting the tension of said spring means.

Claim 3

In a carburetor, primary and secondary systems respectively having primary and secondary air intake passages, throttle valve means controlling said primary and secondary air intake passages, primary and secondary closed fuel chambers, primary and secondary fuel passages respectively leading from said primary and secondary fuel chambers to said primary and secondary air intake passages, primary and secondary fuel inlet passages to said respective primary and secondary chambers, fuel valves controlling the flow of fuel respectively from said primary and secondary fuel inlet passages to said primary and secondary fuel chambers, a fuel line leading from a source of fuel under pressure and communicating with said fuel inlet passages in sequence and then leading back to the source and a restriction in the portion of said fuel line leading back to the source.

Claim 4

In a carburetor, primary and secondary systems respectively having primary and secondary air intake passages, throttle valve means controlling said primary and secondary air intake passages, primary and secondary closed fuel chambers, primary and secondary fuel passages respectively leading from said primary and secondary fuel chambers to said primary and secondary air intake passages, primary and secondary fuel inlet passages to said respective primary and secondary chambers, fuel valves controlling the flow of fuel respectively from said primary and secondary fuel inlet passages to said primary and secondary fuel chambers, a fuel line leading from a source of fuel under pressure and communicating with said fuel inlet passages in sequence and then leading back to the source and a restriction in the portion of said fuel line leading back to the source.

Claim 5

In a carburetor, primary and secondary systems respectively having primary and secondary air intake passages, throttle valve means controlling said primary and secondary air intake passages, primary and secondary closed fuel chambers, primary and secondary fuel passages respectively leading from said primary and secondary fuel chambers to said primary and secondary air intake passages, primary and secondary fuel inlet passages to said respective primary and secondary chambers, fuel valves controlling the flow of fuel respectively from said primary and secondary fuel inlet passages to said primary and secondary fuel chambers, and pressure balance tube passage means connecting said primary and secondary chambers balancing pressures therein and placing the same in communication with one another.

Claim 6

In a carburetor, primary and secondary systems respectively having primary and secondary air intake passages, throttle valve means controlling said primary and secondary air intake passages, primary and secondary closed fuel chambers, primary and secondary fuel passages respectively leading from said primary and secondary fuel chambers to said primary and secondary air intake passages, primary and secondary fuel inlet passages to said respective primary and secondary chambers, fuel valves controlling the flow of fuel respectively from said primary and secondary fuel inlet passages to said primary and secondary fuel chambers, and pressure balance tube passage means connecting said primary and secondary chambers balancing pressures therein and placing the same in communication with one another.

Claim 7

The structure defined in claim 3, wherein said balance tube passage means has a restriction therein.

Claim 8

In a carburetor, an air intake passage, a throttle valve controlling said air intake passage, a fuel passage leading into said air intake passage, an air valve in said air intake passage upstream from said throttle valve, and yieldable means urging said air valve to closed position, said air valve being adapted to open against the action of said yieldable means in response to vacuum in said air intake passage, said yieldable means including a rod connected to said throttle valve, a pin having A lost-motion connection with said air valve, and spring means between said rod and pin.

Claim 9

In a carburetor, an air intake passage, a throttle valve controlling said air intake passage, a fuel passage leading into said air intake passage, an air valve in said air intake passage upstream from said throttle valve, and yieldable means urging said air valve to closed position, said air valve being adapted to open against the action of said yieldable means in response to vacuum in said air intake passage, said yieldable means including a rod connected to said throttle valve, a pin having A lost-motion connection with said air valve, and spring means between said rod and pin.

Claim 10

In a carburetor, a primary air intake passage, a primary throttle valve controlling said air intake passage, a primary fuel passage leading into said air intake passage, a primary air valve in said air intake passage upstream from said throttle valve adapted to open in response to vacuum in said air intake passage, means providing a connection between said throttle valve and said air valve to open said air valve in response to opening movement of said throttle valve, said connection means including spring means imposing a yielding closing bias on said air valve with a force dependent upon the position of said throttle valve.

Claim 11

In a carburetor, a primary air intake passage, a primary throttle valve controlling said air intake passage, a primary fuel passage leading into said air intake passage, a primary air valve in said air intake passage upstream from said throttle valve adapted to open in response to vacuum in said air intake passage, means providing a connection between said throttle valve and said air valve to open said air valve in response to opening movement of said throttle valve, said connection means including spring means imposing a yielding closing bias on said air valve with a force dependent upon the position of said throttle valve.

Claim 12

The structure defined in claim 6, wherein said connection means includes a first member connected to one of said valves, a second member connected to the other of said valves, and spring means between said first and second members.

Claim 13

In a carburetor, a primary air intake passage, a primary throttle valve controlling said air intake passage, a primary fuel passage leading into said air intake passage, a primary air valve in said air intake passage upstream from said throttle valve adapted to open in response to vacuum in said air intake passage, means providing a connection between said throttle valve and said air valve to open said air valve in response to opening movement of said throttle valve, said connection means including spring means imposing a yielding closing bias on said air valve when said throttle valve is in curb-idle position, said air valve being substantially fully open when said throttle valve is at a part-throttle position.

Claim 14

In a carburetor, a primary air intake passage, a primary throttle valve controlling said air intake passage, a primary fuel passage leading into said air intake passage, a primary air valve in said air intake passage upstream from said throttle valve adapted to open in response to vacuum in said air intake passage, means providing a connection between said throttle valve and said air valve to open said air valve in response to opening movement of said throttle valve, said connection means including spring means imposing a yielding closing bias on said air valve when said throttle valve is in curb-idle position, said air valve being substantially fully open when said throttle valve is at a part-throttle position.

Claim 15

The structure defined in claim 8, including a secondary air intake passage, a normally closed secondary throttle valve in said secondary air intake passage, a secondary air valve in said secondary air intake passage upstream from said secondary throttle valve adapted to open in response to vacuum in said secondary air intake passage, a secondary fuel passage leading to said secondary air intake passage between said secondary throttle valve and said secondary air valve, and a lost-motion connection between said primary throttle valve and said secondary throttle valve to open said secondary throttle valve in response to opening movement of said primary throttle valve past said part-throttle position in which said primary air valve is substantially fully open.

Claim 16

The structure defined in claim 9, including a secondary fuel valve controlling the flow of fuel to said secondary fuel passage, means subject to the vacuum in said secondary air intake passage for moving said fuel valve in an opening direction in response to an increase in vacuum and in a closing direction in response to a decrease in vacuum, and means for maintaining said secondary fuel valve open a predetermined minimum amount dependent upon the position of said secondary air valve regardless of the vacuum in said secondary intake passage.

Claim 17

In a carburetor, a primary air intake passage, a primary throttle valve controlling said primary air intake passage, a fuel passage leading to said primary air intake passage, a secondary air intake passage, a normally closed secondary throttle valve in said secondary air intake passage, a secondary air valve in said secondary air intake passage upstream from said secondary throttle valve, a secondary fuel passage leading to said secondary air intake passage between said secondary throttle valve and said secondary air valve, a fuel valve controlling the flow of fuel to said secondary fuel passage, means subject to the vacuum in said secondary air intake passage for moving said fuel valve in an opening direction in response to an increase in vacuum and in a closing direction in response to a decrease in vacuum, and means for maintaining said secondary fuel valve open at least a predetermined amount dependent upon the position of said secondary air valve regardless of and independently of the vacuum in said secondary air intake passage.

Claim 18

In a carburetor, a primary air intake passage, a primary throttle valve controlling said primary air intake passage, a fuel passage leading to said primary air intake passage, a secondary air intake passage, a normally closed secondary throttle valve in said secondary air intake passage, a secondary air valve in said secondary air intake passage upstream from said secondary throttle valve, a secondary fuel passage leading to said secondary air intake passage between said secondary throttle valve and said secondary air valve, a fuel valve controlling the flow of fuel to said secondary fuel passage, means subject to the vacuum in said secondary air intake passage for moving said fuel valve in an opening direction in response to an increase in vacuum and in a closing direction in response to a decrease in vacuum, and means for maintaining said secondary fuel valve open at least a predetermined amount dependent upon the position of said secondary air valve regardless of and independently of the vacuum in said secondary air intake passage.

Claim 19

In a carburetor, a primary air intake passage, a primary throttle valve controlling said primary air intake passage, a fuel passage leading to said primary air intake passage, a secondary air intake passage, a normally closed secondary throttle valve in said secondary air intake passage, a secondary air valve in said secondary air intake passage upstream from said secondary throttle valve, a secondary fuel passage leading to said secondary air intake passage between said secondary throttle valve and said secondary air valve, a fuel valve controlling the flow of fuel to said secondary fuel passage, means subject to the vacuum in said secondary air intake passage for moving said fuel valve in an opening direction in response to an increase in vacuum and in a closing direction in response to a decrease in vacuum, and means for maintaining said secondary fuel valve open a predetermined amount dependent upon the position of said secondary air valve regardless of the vacuum in said secondary air intake passage, said last-mentioned means including a member movable in one direction to open said fuel valve, and a yieldable connection between said secondary air valve and said member.

Claim 20

In a carburetor, a primary air intake passage, a primary throttle valve controlling said primary air intake passage, a fuel passage leading to said primary air intake passage, a secondary air intake passage, a normally closed secondary throttle valve in said secondary air intake passage, a secondary air valve in said secondary air intake passage upstream from said secondary throttle valve, a secondary fuel passage leading to said secondary air intake passage between said secondary throttle valve and said secondary air valve, a fuel valve controlling the flow of fuel to said secondary fuel passage, means subject to the vacuum in said secondary air intake passage for moving said fuel valve in an opening direction in response to an increase in vacuum and in a closing direction in response to a decrease in vacuum, and means for maintaining said secondary fuel valve open a predetermined amount dependent upon the position of said secondary air valve regardless of the vacuum in said secondary air intake passage, said last-mentioned means including a member movable in one direction to open said fuel valve, and a yieldable connection between said secondary air valve and said member.

Claim 21

In a carburetor, a primary air intake passage, a throttle valve controlling said air intake passage, a fuel passage leading into said air intake passage, an air valve in said air intake passage upstream from said throttle valve adapted to open in response to vacuum in said air intake passage, yieldable means resisting opening movement of said air valve with a force dependent upon the position of said throttle valve, and means for increasing the force of said yieldable means in response to a decrease in temperature and for decreasing the force of said yieldable means in response to an increase in temperature.

Claim 22

In a carburetor, a primary air intake passage, a throttle valve controlling said air intake passage, a fuel passage leading into said air intake passage, an air valve in said air intake passage upstream from said throttle valve adapted to open in response to vacuum in said air intake passage, yieldable means resisting opening movement of said air valve with a force dependent upon the position of said throttle valve, and means for increasing the force of said yieldable means in response to a decrease in temperature and for decreasing the force of said yieldable means in response to an increase in temperature.

Claim 23

In a carburetor, a primary air intake passage, a throttle valve controlling said air intake passage, a fuel passage leading into said air intake passage, an air valve in said air intake passage upstream from said throttle valve adapted to open in response to vacuum in said air intake passage, yieldable means resisting opening movement of said air valve with a force dependent upon the position of said throttle valve, said yieldable means including a rod, a pin having a lost-motion connection with said air valve, spring means between said rod and pin adapted to apply a closing bias on said air valve through said pin, a connection between said rod and throttle valve including a temperature sensitive element, said element upon a drop in temperature moving said rod to increase the tension of said spring means and hence the closing bias on said air valve and upon a rise in temperature moving said rod to decrease the tension of said spring means and hence the closing bias on said air valve.

Claim 24

In a carburetor, a primary air intake passage, a throttle valve controlling said air intake passage, a fuel passage leading into said air intake passage, an air valve in said air intake passage upstream from said throttle valve adapted to open in response to vacuum in said air intake passage, yieldable means resisting opening movement of said air valve with a force dependent upon the position of said throttle valve, said yieldable means including a rod, a pin having a lost-motion connection with said air valve, spring means between said rod and pin adapted to apply a closing bias on said air valve through said pin, a connection between said rod and throttle valve including a temperature sensitive element, said element upon a drop in temperature moving said rod to increase the tension of said spring means and hence the closing bias on said air valve and upon a rise in temperature moving said rod to decrease the tension of said spring means and hence the closing bias on said air valve.

Claim 25

The structure defined in claim 14, wherein said temperature sensitive element is a bimetal strip.

Claim 26

In a carburetor, a primary air intake passage, a throttle valve controlling said air intake passage, a fuel passage leading into said air intake passage, an air valve in said air intake passage upstream from said throttle valve adapted to open in response to vacuum in said air intake passage, yieldable means resisting opening movement of said air valve with a force dependent upon the position of said throttle valve, said yieldable means including a rod, a pin having a lost-motion connection with said air valve, spring means between said rod and pin adapted to apply a closing bias on said air valve through said pin, means providing a connection between said rod and throttle valve, and a temperature sensitive device incorporated in said rod operable to alter the effective length of said rod in response to temperature changes such that the tension of said spring means and hence the closing bias thereof is increased upon a drop in temperature and is decreased upon a rise in temperature.

Claim 27

In a carburetor, a primary air intake passage, a throttle valve controlling said air intake passage, a fuel passage leading into said air intake passage, an air valve in said air intake passage upstream from said throttle valve adapted to open in response to vacuum in said air intake passage, yieldable means resisting opening movement of said air valve with a force dependent upon the position of said throttle valve, said yieldable means including a rod, a pin having a lost-motion connection with said air valve, spring means between said rod and pin adapted to apply a closing bias on said air valve through said pin, means providing a connection between said rod and throttle valve, and a temperature sensitive device incorporated in said rod operable to alter the effective length of said rod in response to temperature changes such that the tension of said spring means and hence the closing bias thereof is increased upon a drop in temperature and is decreased upon a rise in temperature.

Claim 28

The structure defined in claim 16, wherein said temperatuRe sensitive device is a capsule containing a thermally expansible material.