Button valve exhaust gas recirculation system

Claim 2

An exhaust gas recirculation system comprising a carburetor having induction passages with throttle plates mounted on a throttle shaft to control flow through said induction passages, an engine intake manifold having intake passages and an exhaust gas crossover passage therein, said carburetor being mounted on a surface of said intake manifold with said induction passages in communication with said intake passages, a passage in said intake manifold in communication at one end with said exhaust crossover passage and extending at its other end to said surface, means associated with said carburetor forming a cross passage in communication with said passage and said induction passages below said throttle plates, a valve, support means secured to said carburetor and supporting said valve for movement from a first position in which said passage is open to a second position in which said passage is blocked, said support means being operatively associated with said throttle shaft to effect movement of said valve between said first position and said second position upon rotation of said throttle shaft, said support means being a leaf spring secured at one end to said carburetor with said valve secured to its free end and said throttle shaft being provided with an undercut flat positioned thereon to move said valve to said second position at low idle and at wide open throttle position of said throttle plates.

Claim 3

An exhaust gas recirculation system comprising a carburetor haviNg induction passages with throttle plates mounted on a throttle shaft to control flow through said induction passages, an engine intake manifold having intake passages and an exhaust gas crossover passage therein, said carburetor being mounted on a surface of said intake manifold with said induction passages in communication with said intake passages, a passage in said intake manifold in communication at one end with said exhaust crossover passage and extending at its other end to said surface, means associated with said carburetor forming a cross passage in communication with said passage and said induction passages below said throttle plates, a valve, support means secured to said carburetor and supporting said valve for movement from a first position in which said passage is open to a second position in which said passage is blocked, said support means being operatively associated with said throttle shaft to effect movement of said valve between said first position and said second position upon rotation of said throttle shaft, said support means being a leaf spring having a base portion, a junction portion integral with and doubled back over said base portion, and an arm portion integral with said junction portion and extending back over the base portion, said base portion being connected at one end opposite said junction portion to said carburetor, said valve being loosely supported on the opposite end of said base portion, an adjusting means movably secured to said base portion intermediate the ends thereof and positioned to abut against said arm portion for adjusting the height of said arm portion relative to said base portion and, cam means on said throttle shaft engageable with said arm portion.

Claim 4

An exhaust gas recirculation system comprising a carburetor haviNg induction passages with throttle plates mounted on a throttle shaft to control flow through said induction passages, an engine intake manifold having intake passages and an exhaust gas crossover passage therein, said carburetor being mounted on a surface of said intake manifold with said induction passages in communication with said intake passages, a passage in said intake manifold in communication at one end with said exhaust crossover passage and extending at its other end to said surface, means associated with said carburetor forming a cross passage in communication with said passage and said induction passages below said throttle plates, a valve, support means secured to said carburetor and supporting said valve for movement from a first position in which said passage is open to a second position in which said passage is blocked, said support means being operatively associated with said throttle shaft to effect movement of said valve between said first position and said second position upon rotation of said throttle shaft, said support means being a leaf spring having a base portion, a junction portion integral with and doubled back over said base portion, and an arm portion integral with said junction portion and extending back over the base portion, said base portion being connected at one end opposite said junction portion to said carburetor, said valve being loosely supported on the opposite end of said base portion, an adjusting means movably secured to said base portion intermediate the ends thereof and positioned to abut against said arm portion for adjusting the height of said arm portion relative to said base portion and, cam means on said throttle shaft engageable with said arm portion.

Claim 5

An exhaust gas recirculation system for an internal combustion engine comprising a carburetor having a throttle body with through induction bores extending from opposite sides thereof, a throttle shaft journalled in said throttle body, throttle valves mounted on said throttle shaft and disposed in said induction passages and rotatable therein below low idle and wide open throttle positions for controlling air flow therethrough, a cavity and groove means provided on one side of said throttle body, an intake manifold having intake passages and an exhaust gas crossover passage therein, said carburetor being mounted on a surface of said intake manifold with said induction bores in communication with said intake passages, said cavity and said groove means in said throttle body forming with the surface of said intake manifold a chamber and cross passages in communication with said induction bores downstream of said throttle valves, a passage in said intake manifold in communication at one end with said exhaust crossover passage and at its other end with said chamber, valve means mounted within said chamber and including a valve movable from a closed position seated against the surface of said intake manifold to block the flow of exhaust gases through said passage to an open position unseated from said surface, said throttle shaft having cam means thereon positioned to control the operation of said valve means, said valve means includes a leaf spring secured at one end to said throttle body within said cavity, with said valve being secured to the free end of said leaf spring and wherein said throttle shaft is provided with a cam flat thereon positioned to move said valve to said closed position at low idle and wide open throttle position.

Claim 6

An exhaust gas recirculation system for an internal combustion engine comprising a carburetor having a throttle body with through induction bores extending from opposite sides thereof, a throttle shaft journalled in said throttle body, throttle valves mounted on said throttle shaft and disposed in said induction passages and rotatable therein below low idle and wide open throttle positions for controlling air flow therethrough, a cavity and groove means provided on one side of said throttle body, an intake manifold having intake passages and an exhaust gas crossover passage therein, said carburetor being mounted on a surface of said intake manifold with said induction bores in communication with said intake passages, said cavity and said groove means in said throttle body forming with the surface of said intake manifold a chamber and cross passages in communication with said induction bores downstream of said throttle valves, a passage in said intake manifold in communication at one end with said exhaust crossover passage and at its other end with said chamber, valve means mounted within said chamber and including a valve movable from a closed position seated against the surface of said intake manifold to block the flow of exhaust gases through said passage to an open position unseated from said surface, said throttle shaft having cam means thereon positioned to control the operation of said valve means, said valve means includes a leaf spring secured at one end to said throttle body within said cavity, with said valve being secured to the free end of said leaf spring and wherein said throttle shaft is provided with a cam flat thereon positioned to move said valve to said closed position at low idle and wide open throttle position.