Altitude and temperature compensated carburetor

Claim 2

A carburetor for an internal combustion engine, said carburetor including a body having an induction passage formed therein, a restriction element movable relative to said body constructed to vary the area of said passage, means responsive to ambient air temperature and pressure connected to said element to locate said element in a position of corresponding restriction, said induction passage including a venturi portion, said restriction element being immediately adjacent the minimum cross-sectional area of said venturi portion, said restriction element comprising an elongate member having a cylindrical portion, a bore formed in said body opening into said passage slidingly and sealingly receiving said cylindrical portion, said restriction element being positionable to protrude from said bore into said venturi portion to reduce the effective area thereof, said restriction element increasing its protrusion into said venturi portion in response to a decrease in the ambient air temperature or an increase in the ambient air pressure, a booster venturi positioned within said induction passage substantially concentric with and adjacent to said firstmentioned venturi portion, said elongate member being protrudable to reduce the effective area between an outer surface of the booster venturi and the inner surface of the first-mentioned venturi portion.

Claim 3

A carburetor according to claim 1, said bore being generally perpendicular to the axis of venturi portion.

Claim 4

A carburetor according to claim 1, said means responsive to ambient air temperatures and pressure comprising an aneroid bellows.

Claim 5

A carburetor according to claim 1, said carburetor including a throttle plate pivotally mounted within said induction passage, a second passage connecting a portion of said induction passage downstream of said throttle plate, valve means in said second passage constructed to regulate air flow in said second passage, said valve means being progressively openable and closeable in response to said means responsive to ambient air temperature and pressure.

Claim 6

A carburetor according to claim 1, said carburetor including a throttle plate pivotally mounted within said induction passage, a second passage connecting a portion at said induction passage upstream at said throttle plate to a portion of said induction passage downstream of said throttle plate, a portion of said second passage being formed within said elongate member, said elongate member including sliding valve means constructed to open and close said second passage in response to movement of said elongate member.

Claim 7

A carburetor according to claim 2, said carburetor including a throttle plate pivotally mounted within said induction passage downstream of said throttle plate, a second passage connecting said venturi portion to a portion of said induction passage downstream of said throttle plate, a longitudinally extending second bore formed in said elongate member opening on the protrudable end of said elongate member comprising a first portion of said sEcond passage, an annular recess formed in said elongate member connected with said second bore and positionable over a second portion of said second passage formed in said carburetor body for communication therewith, said annular recess being spaced from said second portion of said second passage when said elongate member is fully protruding, said annular recess being positioned over said second portion when the elongate member is fully retracted from said induction passage.

Claim 8

A carburetor for an internal combustion engine, said carburetor including a body having an induction passage formed therein, a restriction element movable relative to said body constructed to vary the area of said passage, means responsive to ambient air temperature and pressure connected to said element to locate said element in a position of corresponding restriction, said induction passage including a venturi portion, said restriction element being immediately adjacent the minimum cross-sectional area of said venturi portion, said restriction element comprising an elongate member having a cylindrical portion, a bore formed in said body opening into said passage slidingly and sealingly receiving said cylindrical portion, said restriction element being positionable to protrude from said bore into said venturi portion to reduce the effective area thereof, said restriction element increasing its protrusion into said venturi portion in response to a decrease in the ambient air temperature or an increase in the ambient air pressure, said bore being generally perpendicular to the axis of venturi portion, said carburetor including a throttle plate pivotally mounted within said induction passage downstream of said throttle plate, a second passage connecting said venturi portion to a portion of said induction passage downstream of said throttle plate, a longitudinally extending second bore formed in said elongate member opening on the protrudable end of said elongate member comprising a first portion of said second passage, an annular recess formed in said elongate member connected with said second bore and positionable over a second portion of said second passage formed in said carburetor body for communication therewith, said annular recess being spaced from said second portion of said second passage when said elongate member is fully protruding, said annular recess being positioned over said second portion when the elongate member is fully retracted from said induction passage.

Claim 9

A carburetor for an internal combustion engine, said carburetor including a body having an induction passage formed therein, a restriction element movable relative to said body constructed to vary the area of said passage, means responsive to ambient air temperature and pressure connected to said element to locate said element in a position of corresponding restriction, said induction passage including a venturi portion, said restriction element being immediately adjacent the minimum cross-sectional area of said venturi portion, said restriction element comprising an elongate member having a cylindrical portion, a bore formed in said body opening into said passage slidingly and sealingly receiving said cylindrical portion, said restriction element being positionable to protrude from said bore into said venturi portion to reduce the effective area thereof, said restriction element increasing its protrusion into said venturi portion in response to a decrease in the ambient air temperature or an increase in the ambient air pressure, said bore being generally perpendicular to the axis of venturi portion, said carburetor including a throttle plate pivotally mounted within said induction passage downstream of said throttle plate, a second passage connecting said venturi portion to a portion of said induction passage downstream of said throttle plate, a longitudinally extending second bore formed in said elongate member opening on the protrudable end of said elongate member comprising a first portion of said second passage, an annular recess formed in said elongate member connected with said second bore and positionable over a second portion of said second passage formed in said carburetor body for communication therewith, said annular recess being spaced from said second portion of said second passage when said elongate member is fully protruding, said annular recess being positioned over said second portion when the elongate member is fully retracted from said induction passage.