Engine
AssigneeYamada Mfg. Co., Ltd.
InventorNaohisa Yamada
Life of this patent
Estimating the term…
Abstract
An engine has a fuel supply system comprising a fuel pump provided with valves for opening and closing a fuel suction hole and a fuel exhaust hole alternately, synchronously with a movement of an air supply push rod, a pipe connecting the fuel suction hole of the fuel pump and a fuel supply source to each other; and a pipe connecting the fuel exhaust hole of the fuel pump and a fuel injection device provided on an air supply port of the cylinder to each other, wherein a fuel is fed to the fuel injection device from the fuel pump owing to an upward movement and a downward movement of the air supply push rod caused by a rotation of the crankshaft; and the air supply valve is opened to inject the fuel.
Claims17
An engine of a type in which an air supply valve of a cylinder is opened and closed by rotation of a crankshaft which is transmitted to an air supply cam and an air supply push rod,
- said engine having a fuel supply system comprising:
- a fuel pump provided with valves for opening and closing a fuel suction hole and a fuel exhaust hole alternately, synchronously with a movement of an air supply push rod;
- a pipe connecting said fuel suction hole of said fuel pump and a fuel supply source to each other;
- and
- a pipe connecting said fuel exhaust hole of said fuel pump and a fuel injection device provided on an air supply port of the cylinder to each other,
- wherein a fuel is fed to said fuel injection device from said fuel pump owing to an upward movement and a downward movement of said air supply push rod caused by a rotation of said crankshaft;
- and said air supply valve is opened to inject said fuel.
An engine of a type in which an air supply valve of a cylinder is opened and closed by rotation of a crankshaft which is transmitted to an air supply cam and an air supply push rod,
- said engine comprising:
- the cylinder having an air supply port;
- a fuel injection device provided on the air supply port of the cylinder;
- a fuel pump having a fuel pump chamber, a fuel suction hole and a fuel exhaust hole both communicating with said fuel pump chamber, a piston member for setting an inside of said fuel pump chamber to a pressurized state and a depressurized state according to a movement of said air supply push rod, a lead valve for opening said fuel suction hole when the inside of said fuel pump chamber has the depressurized state, and a lead valve for opening said fuel exhaust hole when the inside of said fuel pump chamber has the pressurized state;
- a pipe connecting said fuel suction hole of said fuel pump and a fuel supply source to each other;
- and
- a pipe connecting said fuel exhaust hole of said fuel pump and said fuel injection device to each other.
An engine of a type in which an air supply valve of a cylinder is opened and closed by rotation of a crankshaft which is transmitted to an air supply cam and a air supply push rod for an air supply valve,
- said engine comprising:
- a crankcase having an air supply pipe;
- the cylinder having an air supply port including an air-feeding pipe connected to an inside of said crankcase;
- a fuel injection device provided on the air supply port of the cylinder;
- a fuel pump having a valve for opening and closing a fuel suction hole and a fuel exhaust hole synchronously with a movement of said air supply push rod for said air supply valve;
- a pipe connecting a fuel suction hole of said fuel pump and a fuel supply source to each other;
- a fuel supply pipe connecting a fuel exhaust hole of said fuel pump and said fuel injection device to each other;
- and
- a fuel supply regulator provided in said fuel supply pipe to adjust an amount of a fuel in such a way that the higher an internal pressure of said crankcase or that of said air-feeding pipe is, the more an amount of said fuel becomes.
An engine of a type in which an air supply valve of a cylinder is opened and closed by rotation of a crankshaft which is transmitted to an air supply cam and a air supply push rod for an air supply valve,
- said engine comprising:
- a crankcase having an air supply pipe;
- the cylinder having an air supply port including an air-feeding pipe connected to an inside of said crankcase;
- a fuel injection device provided on the air supply port of the cylinder;
- a fuel pump having a fuel pump chamber, a fuel suction hole and a fuel exhaust hole both communicating with said fuel pump chamber, a piston member for setting an inside of said fuel pump chamber to a pressurized state and a depressurized state according to a movement of said air supply push rod for said air supply valve, a lead valve for opening said fuel suction hole when the inside of said fuel pump chamber has the depressurized state, and a lead valve for opening said fuel exhaust hole when the inside of said fuel pump chamber has the pressurized state;
- a pipe connecting said fuel suction hole of said fuel pump and a fuel supply source to each other;
- a fuel supply pipe connecting said fuel exhaust hole of said fuel pump and said fuel injection device to each other;
- and
- a fuel supply regulator provided on said fuel supply pipe and having a diaphragm partitioning an inside of said fuel supply regulator into a primary side communicating with a fuel inflow port, a fuel outflow port, and a fuel return hole and a secondary side communicating with an inside of said crankcase or an inside of said air-feeding pipe and moving when there is a pressure fluctuation at said secondary side;
- and a valve, for said fuel return hole, capable of adjusting an open degree of said fuel return hole owing to a movement of said diaphragm in such a way that the higher a pressure at said secondary side, the lower the open degree of said fuel return hole becomes.
Dependencies are inferred from the claim text.