Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
1999-04-19
2001-05-08
Miller, Carl S. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123SDIG003
Reexamination Certificate
active
06227171
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a fuel regulation apparatus for an engine for a model for regulating supply of fuel according to rotational frequency which is mounted to the engine for the model which pressurizes the fuel by varying air pressure generated in a crankcase when driving.
A carburetor has been conventionally used in a two-stroke cycle or four-stroke cycle glow engine as a means for regulating quantity of fuel supplied to a combustion chamber of the engine.
The present applicant has proposed an engine for a model equipped with a fuel injection apparatus instead of the carburettor. In this engine, air pressure generated in a crankcase is introduced into a combustion tank through a check valve and stored in the tank and fuel is pressurized to 20-100kPa.
The pressure generated in the crankcase of the engine varies depending on rotational frequency, that is to say, it is high at the time of high speed rotation, and it is low at the time of low speed rotation. Therefore, the fuel tank is constructed so that the maximum pressure can be stored therein. It is, however, difficult in practice to maintain stably a constant pressure, for example, at 30-40 kPa.
Therefore, a regulator has been conventionally used in order to control constantly the pressure of fuel supplied from the fuel tank to feed to a fuel injection apparatus. The regulator is an apparatus for passing only the fuel having a certain given pressure.
In a conventional engine of a model which pressurizes the fuel by air pressure in a crankcase and injects the fuel by a fuel injection apparatus, it is premised that the pressure of the fuel is constant, and the supply of the fuel is controlled by injection time. That is to say, when the rotational frequency is low, the injection time is shortened to decrease the quantity of the fuel, and when the rotational frequency is high, the injection time is lengthened to increase the quantity of the fuel.
At the time of low speed, however, the pressure of the fuel rises since the quantity of the fuel used is small, and the fuel becomes dense. And, since the quantity of the fuel used per unit time is large at the time of high speed, the supply of the fuel is not sufficient, and the fuel becomes thin. Therefore, in the conventional engine for a model, the rotation of the engine is unstable and it is possible in some instances that overheat takes place at the time of high speed and engine stop takes place at the time of low speed.
SUMMARY OF THE INVENTION
An object of this invention is to provide a fuel regulation apparatus for an engine of a model which is possible to regulate supply of pressurized fuel according to the high or low of the rotational frequency of the engine and a fuel injection apparatus using the same.
The fuel regulation apparatus (
30
) for an engine of a model described in claim
1
is mounted to the engine for the model (
1
) in which fuel is pressurized by air pressure generated in a crankcase (
8
) when driving and the fuel regulation apparatus for regulating supply of the fuel comprises a main body (
31
) provided with an inlet (
32
) and an outlet (
33
) for the fuel, a regulating valve (
35
) for regulating opening of a passage (
34
) between the inlet and outlet in the main body to regulate supply of the fuel, and a regulated air supplying part (
42
) for supplying the air pressure to the regulating valve in the main body in such a direction as to enlarge the opening of the passage.
The fuel regulation apparatus (
30
) for an engine of a model described in claim
1
is mounted to the engine for the model (
1
) in which fuel is pressurized by air pressure generated in a crankcase (
8
) when driving and the fuel regulation apparatus for regulating supply of the fuel comprises a main body (
31
), an inlet (
32
) for the fuel placed to the main body, an outlet (
33
) for the fuel placed to the main body, a passage (
34
) placed to the main body so as to connect the inlet with the outlet, a seat face (
37
) placed to the passage, a regulating valve (
35
) placed in the main body and reciprocating in the passage for regulating opening of the seat face, and a regulated air supplying part (
42
) for introducing the air pressure into the main body so as to push the regulating valve in such a direction as to open the seat face.
The fuel regulation apparatus for an engine of a model described in claim
3
is characterized in that the fuel regulation apparatus (
30
) for the engine of the model described in claim
2
is further provided with a first pushing means (
38
) for pushing the regulating valve (
35
) in such a direction as to close the seat face (
37
), an adjusting mechanism (
43
) for adjusting a position of the regulated air supplying part (
42
) relative to the main body in a direction of reciprocating motion of the regulating valve (
35
), and a second pushing means (
44
) placed between the regulated air supplying part (
42
) and the regulating valve (
35
) in the main body for pushing the regulating valve in such a direction as to open the seat face (
44
).
The fuel injection apparatus for an engine for a model described in claim
4
is characterized in that a fuel inlet for a fuel injection apparatus (
50
) is connected to the fuel outlet (
33
) of the fuel injection apparatus (
30
) of the engine for the model described in claim
3
.
REFERENCES:
patent: 2800121 (1957-07-01), Fletcher
patent: 3734072 (1973-05-01), Yamda
patent: 3800754 (1974-04-01), Carlson
patent: 4957072 (1990-09-01), Goldowsky
patent: 4984547 (1991-01-01), Muraji
patent: 5092299 (1992-03-01), Muntean
patent: 5479899 (1996-01-01), Phelps
patent: 5975055 (1999-11-01), Matsuda
Futaba Denshi Kogyo K.K.
Miller Carl S.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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