Carburetor device for an engine

Claim 1

A device for feeding a mixture of air and fuel to a multiplecylinder internal combustion engine, comprising a large main carburetor for feeding fuel at full load and having a largesection outlet and a throttle controlling the section of the outlet, a small carburetor for feeding fuel at low loads and having a small-section outlet of smaller section than said largesection outlet and a throttle controlling the section of the outlet of the small carburetor, induction pipes for connection to each of the cylinders of the engine, the induction pipes being interconnected at a junction, the large carburetor being located adjacent to and substantially in vertical alignment with said junction and tHe large-section outlet communicating substantially directly with said junction, the small carburetor being disassociated from the main carburetor and being more remote from said junction than the main carburetor, and means defining a mixture heating passage interposed between and interconnecting the outlet of the small carburetor and said junction of the induction pipes downstream of the throttle controlling the outlet of the main carburetor with respect to the flow of the mixture to said junction, means for heating said mixture heating passage substantially throughout the length of said mixture heating passage between the outlet of the small carburetor and said junction, the main carburetor comprising an idling circuit having an outlet and means defining a second passage which puts the idling circuit outlet in communication with an upstream end of the heating passage remote from said junction and adjacent the small caburetor and downstream of the throttle of the small carburetor.

Claim 2

A device for feeding a mixture of air and fuel to a multiplecylinder internal combustion engine, comprising a large main carburetor for feeding fuel at full load and having a largesection outlet and a throttle controlling the section of the outlet, a small carburetor for feeding fuel at low loads and having a small-section outlet of smaller section than said largesection outlet and a throttle controlling the section of the outlet of the small carburetor, induction pipes for connection to each of the cylinders of the engine, the induction pipes being interconnected at a junction, the large carburetor being located adjacent to and substantially in vertical alignment with said junction and tHe large-section outlet communicating substantially directly with said junction, the small carburetor being disassociated from the main carburetor and being more remote from said junction than the main carburetor, and means defining a mixture heating passage interposed between and interconnecting the outlet of the small carburetor and said junction of the induction pipes downstream of the throttle controlling the outlet of the main carburetor with respect to the flow of the mixture to said junction, means for heating said mixture heating passage substantially throughout the length of said mixture heating passage between the outlet of the small carburetor and said junction, the main carburetor comprising an idling circuit having an outlet and means defining a second passage which puts the idling circuit outlet in communication with an upstream end of the heating passage remote from said junction and adjacent the small caburetor and downstream of the throttle of the small carburetor.

Claim 5

A device for feeding a mixture of air and fuel to an internal combustion engine having two rows of cylinders, comprising two large main carburetors for respectively feeding the mixture to the two rows of cylinders and respectively having a large-section outlet and a throttle controlling the section of the outlet, a small carburetor feeding fuel at low loads and having a small-section outlet of smaller section than said large-section outlet and a throttle controlling the section of the outlet of the small carburetor, first induction pipes for connection to one row of cylinders and second induction pipes for connection to the other row of cylinders, the first induction pipes and the second induction pipes being respectively interconnected at a first junction and a second junction, the two main carburetors being respectively located adjacent to and substantially in vertical alignment with the first junction and second junction, the outlets of the two main carburetors communicating respectively substantially directly with the first junction and second junction, the small carburetor being disassociated from the main carburetors and being more remote from the first junction and second junction than the main carburetors, means defining a mixture heating passage interposed between and interconnecting the outlet of the small carburetor and both the junctions of the induction pipes downstream of the throttles controlling the outlets of the main carburetors with respect to the flow of the mixture to said junctions, means for heating said mixture heating passage substantially throughout the length of said mixture heating passage between the outlet of the small carburetor and said junctions, the small carburetor and the heating passage being contained substantially in a plane and the two main carburetors being located on opposite sides of said plane, each main carburetor comprising an idling circuit having an outlet, and second passage means putting the idling circuit outlet of each main carburetor in communication with an upstream end of the heating passage remote from said junction and adjacent the small carburetor and downstream of the throttle of the small carburetor.

Claim 6

A device for feeding a mixture of air and fuel to an internal combustion engine having two rows of cylinders, comprising two large main carburetors for respectively feeding the mixture to the two rows of cylinders and respectively having a large-section outlet and a throttle controlling the section of the outlet, a small carburetor feeding fuel at low loads and having a small-section outlet of smaller section than said large-section outlet and a throttle controlling the section of the outlet of the small carburetor, first induction pipes for connection to one row of cylinders and second induction pipes for connection to the other row of cylinders, the first induction pipes and the second induction pipes being respectively interconnected at a first junction and a second junction, the two main carburetors being respectively located adjacent to and substantially in vertical alignment with the first junction and second junction, the outlets of the two main carburetors communicating respectively substantially directly with the first junction and second junction, the small carburetor being disassociated from the main carburetors and being more remote from the first junction and second junction than the main carburetors, means defining a mixture heating passage interposed between and interconnecting the outlet of the small carburetor and both the junctions of the induction pipes downstream of the throttles controlling the outlets of the main carburetors with respect to the flow of the mixture to said junctions, means for heating said mixture heating passage substantially throughout the length of said mixture heating passage between the outlet of the small carburetor and said junctions, the small carburetor and the heating passage being contained substantially in a plane and the two main carburetors being located on opposite sides of said plane, each main carburetor comprising an idling circuit having an outlet, and second passage means putting the idling circuit outlet of each main carburetor in communication with an upstream end of the heating passage remote from said junction and adjacent the small carburetor and downstream of the throttle of the small carburetor.