Fuel supply system for internal combustion engine and fuel transfer tube
AssigneeHitachi, Ltd.
InventorsSatoshi Ida, Takashi Kokojima, Takeshi Hidaka
Life of this patent
Estimating the term…
Abstract
In a fuel supply system constituted such that there is disposed a saddle type fuel tank provided with a main chamber and an auxiliary chamber on both sides of an upwardly protruding center portion of a bottom face thereof, a fuel transfer tube which is mounted to lie over the protruding portion of the fuel tank, is connected to a fuel introduction port of a jet pump disposed on a main chamber side, to pump fuel in the auxiliary chamber via the fuel transfer tube, at least a part of the fuel transfer tube is formed by arranging alternately a plurality of bellows portions each of which cross section is changed, and a plurality of straight portions each of which cross section is fixed.
Claims15
A fuel supply system for an internal combustion engine, comprising:
- a saddle type fuel tank provided with a main chamber and an auxiliary chamber on both sides of an upwardly protruding center portion of a bottom face thereof;
- a fuel return pipe returning fuel from an engine body to said fuel tank;
- a jet pump having a function for pumping the fuel to a main chamber side of said fuel tank by utilizing a negative pressure occurring due to a fuel ejection pressure from an outlet of said fuel return pipe;
- and
- a fuel transfer tube with one end portion connected to a fuel introduction port of said jet pump and the other end portion mounted to lie over said protruding portion, to face said auxiliary chamber,
- wherein at least a part of said fuel transfer tube is formed by arranging alternately a plurality of bellows portions each of which cross section is variable, and a plurality of straight portions each of which cross section is fixed, each of adjacent bellows portions having only one of the straight portions therebetween, and wherein a straight portion disposed downstream of one bellows portion has a length equal to or more than a length of the one bellows portion disposed upstream of the straight portion;
- and
- wherein said fuel transfer tube is configured to be formed by in bellows shape at a portion thereof, said fuel transfer tube being variable in accordance with the shape of the fuel tank.
A fuel transfer tube connected to a fuel inlet of a fuel pump disposed in a fuel tank of an internal combustion engine,
- wherein said fuel transfer tube is formed by arranging alternately bellows portions each of which cross section is variable, and straight portions each of which cross section is fixed, each of adjacent bellows portions having only one of the straight portions therebetween, and wherein a straight portion disposed downstream of one bellows portion has a length equal to or more than a length of the one bellows portion disposed upstream of the straight portion;
- wherein said fuel tank is a saddle type fuel tank provided with a main chamber and an auxiliary chamber on both sides of an upwardly protruding center portion of a bottom face thereof, and an end portion on a main chamber side is a jet pump having a function for pumping fuel by utilizing a negative pressure occurring due to a fuel ejection pressure from an outlet of a fuel return pipe;
- and
- wherein said fuel transfer tube is configured to be formed in bellows shape at a portion thereof, said fuel transfer tube being variable in accordance with the shape of the fuel tank.
Dependencies are inferred from the claim text.