Carburetor equipped with needle jet
AssigneeHonda Motor Co., Ltd.
InventorNorio Saito
Life of this patent
Estimating the term…
Abstract
A carburetor includes a valve mechanism, and a needle jet extending in an up and down direction. Also included is a jet needle provided to a sliding throttle valve disposed in an air intake tube and inserted into the jet needle. The valve mechanism includes a valve body, which has a plate shape and which is moved by the flow of the fuel. When a motorcycle lands on the ground after the motorcycle jumps while running, the fuel-in-jet, that is, the fuel in the needle jet, tends to accelerate downwardly. The valve mechanism prevents a downward reverse flow of the fuel-in-jet on which such downward acceleration acts. The resulting configuration prevents temporary production of a lean air-fuel mixture, which may possibly be produced when the fuel in the needle jet has accelerated downwardly.
Claims20
A carburetor in which a needle jet is disposed as extending in an up and down direction, fuel in a fuel chamber is supplied to an air intake tube through an upper end portion of the needle jet, a throttle valve is disposed in the air intake tube, a jet needle provided to the throttle valve is inserted into the needle jet, and an amount of the fuel to be supplied to the air intake tube is controlled by the jet needle working in conjunction with an opening-and-closing action of the throttle valve, the carburetor comprising:
- a valve mechanism adapted to prevent a downward reverse flow of fuel-in-jet, which is the reverse flow of the fuel in the needle jet caused by a downward acceleration acting on the fuel-in-jet.
A fuel system, comprising:
- an air intake tube;
- a throttle valve disposed in the air intake tube;
- a carburetor, the carburetor including:
- a needle jet extending in an up and down direction below the throttle valve;
- a jet needle provided to the throttle valve inserted into the needle jet,
- a fuel chamber adapted to supply fuel to the air intake tube through an upper end portion of the needle jet;
- and
- a valve mechanism adapted to prevent a downward reverse flow of fuel-in-jet, which is the reverse flow of the fuel in the needle jet caused by a downward acceleration acting on the fuel-in-jet,
- wherein an amount of the fuel to be supplied to the air intake tube is controlled by the jet needle working in conjunction with an opening-and-closing action of the throttle valve.
A carburetor, comprising:
- a needle jet extending in an up and down direction,
- a fuel chamber for supplying fuel to an air intake tube through an upper end portion of the needle jet,
- a sliding throttle valve capable of a reciprocating up and down for opening and closing the air intake tube,
- a jet needle provided to the throttle valve and inserted into the needle jet;
- and
- a valve mechanism adapted to prevent a downward reverse flow of fuel-in-jet, which is the reverse flow of the fuel in the needle jet caused by a downward acceleration acting on the fuel-in-jet,
- wherein an amount of the fuel to be supplied to the air intake tube is controlled by the jet needle working in conjunction with an opening-and-closing action of the throttle valve.
Dependencies are inferred from the claim text.