Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Reexamination Certificate
2000-05-02
2001-10-16
Scherbel, David A. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
C239S585500, C239S574000, C251S129090, C335S268000, C137S613000
Reexamination Certificate
active
06302341
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an injector for supplying fuel into an internal combustion engine, particularly a fuel injector having two solenoids for controlling the flow of the fuel in the fuel injector, which is capable of preventing the surge pressure of fuel without the return of the fuel to a fuel tank.
BACKGROUND OF THE INVENTION
Generally, in a fuel supplying device to the internal combustion engine, there are two types of fuel supplying methods, one of which has return pipe for returning the fuel remained in the fuel supplying device after injection of the fuel to a combustion chamber of the engine, the other of which has not the return pipe for returning the fuel remained in the supplying fuel device.
Especially, the returnless type of fuel supplying method supplies the fuel supplied from a fuel pump by operation of the fuel pump to a fuel rail after the pressure of the fuel is constantly regulated by a fuel regulator. Then the fuel of the fuel rail is injected to the combustion chamber of the internal combustion engine through a fuel injector.
As shown in FIG.
4
and
FIG. 5
, the typical structure of the fuel injector comprises a body
100
having a supplying port
110
through which the fuel having constant pressure is supplied into the body
100
and a nozzle port
120
through which the fuel is injected into the combustion chamber of the internal combustion engine.
In the body
100
of the fuel injector is mounted a spool
31
, which is moved by operation of a solenoid
30
and supported by a spring
32
to selectively opens and closes the fuel passage
130
formed in the body
100
.
The fuel is supplied into the body
100
of the fuel injector under the state that the spool
21
closes the fuel passage
130
. Then, at injection time, the spool
31
is moved to the inside of the solenoid
30
to open the fuel passage
130
and the fuel in the fuel passage
130
is injected through the end of left part of the nozzle port
120
.
As shown in
FIG. 5
, the prior fuel injector opens the fuel passage
130
under the state that the supplying port
110
is opened even the injection time, so the fuel pressure in the fuel rail is instantly varied. As the result of that, the fuel amount injected into the combustion chamber of the internal combustion engine is reduced, and then the engine is hunted and the output of the engine is decreased.
While, in U.S. Pat. No 4,925,112 is disclosed a fuel injector, which has a pair solenoid coils aligned along a common axis between an armature that serve as fuel metering valve and an armature that operates a charge delivery valve.
And in U.S. Pat. No 5.979.786 is disclosed a fuel injection apparatus, which has a single solenoid coil that controls the movement of a first and second armature respectively. Each armature is connected to a valve element for controlling a fuel supply and for controlling the delivery of the charge respectively.
Then, the fuel injectors according to the above U.S. Patents are to control the flow of the fuel and the air simultaneously. Therefore, the construction of the fuel injector is very complex and have too much number of parts in their inside.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a fuel injector that is capable of preventing the surge pressure of fuel without the return of the fuel to a fuel tank.
The other object of the present invention is to provide a fuel injector of which construction is simple and is comprised of few numbers of parts.
The present invention to achieve the above object comprises an injector for supplying fuel into the combustion chamber of an internal combustion engine comprising an injector body having a fuel supplying port connected to a fuel rail, a nozzle port injecting the fuel and a fuel passage connecting the fuel supplying port and the nozzle port; two solenoids are mounted in the injector body along the fuel passage; and two spools elastically supported by two springs are mounted in each of the solenoid
10
and
20
respectively and opens or closes selectively the fuel supplying port
110
and the nozzle port
120
.
Wherein, when the fuel is supplied from the fuel rail into the injection body, one spool for supplying the fuel opens the fuel supplying port and the other spool for injecting the fuel closes the nozzle port, whereas when the fuel is injected into the combustion chamber, the spool for supplying the fuel closes the fuel supplying port and the other spool for injecting the fuel opens the nozzle port.
The fuel injector in accordance with the present invention can control the fuel supplied into the combustion chamber of the internal combustion engine without the surge pressure, when the fuel is injected
Moreover, since the fuel injector in accordance with the present invention is comprised of two solenoids and two spools that are arranged along the fuel passage, the structure is simple and the fuel injector have few number of parts. Therefore, the fuel injector can be easily repaired and assembled in the manufacturing part.
REFERENCES:
patent: 3462116 (1969-08-01), Wright, Jr.
patent: 3942485 (1976-03-01), Suda et al.
patent: 4925112 (1990-05-01), Wahba
patent: 4972996 (1990-11-01), Cerny
patent: 5199459 (1993-04-01), Mullally
patent: 5450876 (1995-09-01), Reinicke
patent: 5979786 (1999-11-01), Longman et al.
patent: 6113014 (2000-09-01), Coldren et al.
Christie Parker & Hale LLP
Ganey Steven J.
Hyundai Motor Company
Scherbel David A.
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