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US 6,478,288 B1Granted
High performance carburetor
OwnerBret A. Duncaninventor
Life of this patent
Estimating the term…
Abstract
A carburetor for supplying fuel to an engine includes a body defining a venturi and first and second fuel lines fuel lines which discharge fuel into the venturi from a fuel reservoir. The opening of the first fuel line into the venturi is near the wall to flow fuel into the air flow adjacent the body wall. The opening of the second fuel line into the venturi is away from the wall to flow fuel into the air flow through the interior portion of the venturi.
Claims26
A fixed venturi carburetor for mixing fuel with an air flow to deliver a combustible air/fuel mixture to an internal combustion engine, the carburetor comprising:
- a body having a wall defining a bore extending through the body, the wall defining a venturi comprising a constant area inlet for receiving the air flow, an outlet downstream from the inlet for discharging the air flow, and a reduced diameter throat between the inlet and the outlet for generating a venturi effect from the airflow;
- a throttle plate in the bore downstream of the venturi for opening and closing the venturi outlet to regulate air flow through the venturi and the venturi effect generated thereby, the throttle plate movable between a partially open position wherein the throttle plate obstructs an interior portion of the venturi outlet for providing a low rate of air flow through the venturi and a wide open position wherein the interior portion of the venturi outlet is essentially unobstructed for providing a high rate of air flow through the venturi;
- a fuel reservoir;
- a first nozzle for discharging fuel into the venturi and a first fuel line flowing fuel from the fuel reservoir to the first nozzle;
- a second nozzle for discharging fuel into the venturi and a second fuel line flowing fuel from the fuel reservoir to the second nozzle;
- the first nozzle opening into the venturi throat close to the wall for discharging fuel into the air flowing through the outer periphery of the throat adjacent the wall;
- the second nozzle opening into the venturi throat away from the wall for discharging fuel into the air flowing through the interior of the throat away from the wall;
- and
- the first nozzle being in fluid communication with the fuel supply when the throttle plate is partially open to discharge fuel into the air flowing through the venturi throat.
6 more elements
A carburetor comprising:
- a body having a wall bounding a through bore, the wall defining a venturi having a center axis, the venturi comprising an inlet, an outlet spaced axially from the inlet, and a reduced diameter throat between the inlet and outlet, the throat having an outer portion adjacent the body wall and an inner portion surrounded by the outer portion;
- a throttle plate in the wall downstream from the venturi outlet and adapted to control air flow discharged from the venturi, the throttle plate movable to regulate the air flow rate between a partially open position representing a low power condition and a wide open position representing a high power condition;
- a fuel reservoir;
- a first nozzle for discharging fuel into the venturi and a first fuel line connecting the fuel reservoir with the first nozzle;
- a second nozzle for discharging fuel into the venturi and a second fuel line connecting the fuel reservoir with the second nozzle;
- the first nozzle opening into the outer portion of the venturi throat bounded by the wall for metering fuel into the air flowing through such outer throat portion and the second nozzle opening into the inner portion of the venturi throat away from the wall for metering fuel into the air flowing through such inner throat portion;
- and
- the first nozzle in fluid communication with the fuel reservoir when the throttle plate is in the partially open position to discharge during a low power condition.
5 more elements
A fixed venturi carburetor comprising:
- a body having a wall bounding a through bore, the wall defining a venturi having a center axis, the venturi comprising an inlet, an outlet downstream from the inlet, and a reduced diameter throat between the inlet and outlet, the bore having an outer portion adjacent the body wall and an inner portion surrounded by the outer portion;
- a throttle plate in the wall downstream from the venturi outlet and adapted to control air flow discharged from the venturi, the throttle plate movable to regulate the air flow rate between a partially open position representing a low power condition and a wide open position representing a high power condition;
- a fuel reservoir;
- first and second nozzles upstream from the throttle plate for discharging fuel into the bore, a first fuel line connecting the fuel reservoir with the first nozzle and a second fuel line connecting the fuel reservoir with the second nozzle;
- the first nozzle opening into the outer portion of the venturi bounded by the wall for discharging fuel into such outer bore portion and the second nozzle opening into the inner portion of the bore away from the wall for metering fuel into the air flowing through such inner bore portion;
- and
- the first nozzle in fluid communication with the fuel reservoir when the throttle plate is in the partially open position to discharge during a low power condition.
4 more elements
Dependencies are inferred from the claim text.