Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1989-03-06
1991-09-17
Dolinar, Andrew M.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
123180T, F02M 110
Patent
active
050484770
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a final supply system for an for engine which facilitates start-up by augmenting the concentration of the fuel at the time of starting the engine.
BACKGROUND ART
Conventionally, a choke device for an engine to facilitate start-up by augmenting the concentration of fuel at the time of starting the engine is arranged, as shown in FIG. 2 and FIG. 3, by pivotally mounting, with shaft 7, a choke valve 5 for opening and closing a suction port 3 of a carburetor 2 provided on an air intake port 1 of the engine so as to be freely oscillatable in the direction perpendicular to an intake gas passage 9. By restricting the area of the sunction port 3 through an oscillatory operation of the choke valve 5, negative pressure created in the intake gas passage 9 is increased by the intake force of the engine. As a result, the amount of the fuel, jetting out of the main nozzle port 11 opened (its mouth) to the intake gas passage 9 is increased, so that the concentration of the fuel contained in sucked gas is also increased, thereby facilitating start-up of the engine.
With such a conventional structure, however, operation was cumbersome because it was necessary to appropriately operate the opening of the choke valve in addition to the starting operation for rotating the crankshaft, and moreover, it was necessary to quickly return and release the choke valve after the engine was started.
Furthermore, a large force was required for starting the engine due to lowering of the intake pressure caused by the closing of the choke valve.
DISCLOSURE OF THE INVENTION
The present invention comprises a starting nozzle port opened to the intake gas passage of the carburetor, a starting fuel pump for supplying the fuel in a fuel tank to the starting nozzle port by sucking the fuel, and a fuel motor for driving the starting fuel pump. According to the present invention, when a switch is pressed, the starting fuel pump is driven by the fuel motor so as to supply the fuel to the starting nozzle by sucking the fuel in the fuel tank. As a result, ignition becomes easy due to the increase of the fuel concentration within the intake gas, which facilitates the start-up of the engine.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an explanatory path diagram for showing the construction of one embodiment of the present invention,
FIG. 2 and FIG. 3 are a side cross sectional view and a front view, respectively, of a conventional device,
FIG. 4 is an explanatory path diagram for showing the construction of an embodiment equipped with an oil reservoir,
FIG. 5 is an explanatory diagram for showing the electrical circuit of the embodiment,
FIG. 6 and FIG. 7 are explanatory diagrams for a second and a third embodiment, respectively, of the device equipped with an oil reservoir,
FIG. 8 is an explanatory path diagram for showing the construction of another embodiment, and
FIG. 9 is a side cross sectional view of the principal parts of the device shown in FIG. 8.
PREFERRED EMBODIMENT OF THE INVENTION
Referring to the drawings, one embodiment of the present invention will be described in detail in what follows.
In FIG. 1, a carburetor 17 is fixed with bolts (not shown) to an intake port 13 of an engine via an insulator 15. A main nozzle port 19 opened to an intake gas passage 18 which is communicated with the intake port, is communicated with a fuel chamber 21 provided in the lower part of the carburetor 17. The fuel chamber 21 is provided with a main fuel passage 27 which communicates the chamber with a fuel tank 25 via a diaphragm pump 23. In the diaphragm pump 23, a pressure chamber 29 and a pump chamber 35 are formed by defining the inside of the diaphragm pump 23 with a diaphragm 33. The diaphragm 33 is vibrated according to the positive and negative pressure in the crankcase which are supplied through a communicating tube 31 communicated with the crankcase. A main fuel passage 27 is communicated with the pump chamber 35 via check valves 37 and 39. In the intake gas passage 18, a starting
REFERENCES:
patent: 3614945 (1971-10-01), SchlagMuller et al.
patent: 3704702 (1972-12-01), Aono
patent: 4441467 (1984-04-01), Powell
patent: 4554896 (1985-11-01), Sougawa
patent: 4676204 (1987-06-01), Inoguchi et al.
Patent Abstracts of Japan, vol. 10, No. 138, May 21, 1986 (relative to JP-A-60 261 967-Aisan Kogyo K.K.)
Morooka Isao
Wada Minoru
Yamagishi Tetsuo
Dolinar Andrew M.
Komatsu Zenoah Kabushiki Kaisha
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