Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1998-03-02
1999-08-17
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel injection system
123511, F02M 3704
Patent
active
059378271
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The subject invention refers to a fuel supply system for a combustion engine, which includes a fuel tank, suitably supplied with a fuel filter and a duct, for instance a fuel hose, which connects the fuel tank with a fuel supply unit, for instance a carburetor or a fuel injection system.
BACKGROUND OF THE INVENTION
Today, many combustion engines, especially smaller engines, have an open or ventilated fuel system. This implies that hydrocarbons evaporate from their fuel tanks and emit air pollution even when the engines are not running, but at the same time overpressure in the fuel tank is prevented, which is very important. In most cases, a handheld working tool, such as a chain saw, has a fuel tank with a ventilation filter, usually made of sintered material. Hereby, the tool can be inclined without any significant fuel leakage, but the other problems, such as smell and air pollution, remain.
Through U.S. Pat. No. 1,633,843 a fuel system is known, which comprises a pressure regulator connected to the fuel tank. The regulator prevents fuel and fuel fumes from leaking out of the fuel tank when it is under overpressure. The regulator is mounted in such a way that it protrudes from the fuel tank and is in its entirety located above the fuel level. Due to this location the regulator is heated up by the heat from the adjacent cylinder and cannot significantly be cooled down by the fuel. This implies an increased risk for vapor bubbles being formed in the fuel and thus causing a so called vapor lock in the regulator.
PURPOSE OF THE INVENTION
The purpose of the subject invention is to substantially reduce the above outlined problems by creating a fuel supply system that prevents or substantially reduces the possibility of any overpressure in the fuel tank propagating to the engine's fuel supply unit, at the same time as heat related problems to a great extent are avoided. Hereby, conditions are created for substantially reducing air pollution and smell caused by evaporation, with maintained satisfactory starting properties and reliability of operation.
SUMMARY OF THE INVENTION
The above purpose is achieved in the device in accordance with the invention having the characteristics appearing from the appended claims.
The fuel supply system in accordance with the invention is thus essentially characterized in that a pressure regulator is mounted, either rigidly or flexibly, to one of the tank's sides, suitably the upper side, and is immersed, either entirely or to a greater part, in relation to the tank side, and the pressure regulator is connected somewhere in between the duct's inlet inside the tank and its outlet out of the tank. The pressure regulator's immersed location reduces its heating and improves its cooling, so that satisfactory starting properties and reliability of operation can be obtained. Hereby, a closed, non-ventilated fuel tank can be used, and air pollution be avoided. Further characteristics and advantages of the invention will be apparent from the ensuing description of preferred embodiments and with the support of the drawing figures.
BRIEF DESCRIPTION OF THE INVENTION
The invention will be described in closer detail in the following by way of various embodiments thereof with reference to the accompanying drawing figures, on which the same numbers in the different figures state each other's corresponding parts.
FIG. 1 shows a fuel supply system in accordance with the invention. The system's fuel tank is integrated with a part of handle system for a chain saw. A pressure regulator is mounted mainly inside the fuel tank.
FIG. 2 shows a somewhat different design of the fuel supply system in accordance with the invention. The system's pressure regulator and fuel filter hang down in the tank in a fuel duct and an air duct.
FIG. 3 shows a first embodiment of a pressure regulator, which is a part of the fuel supply system.
FIG. 4 shows a second embodiment of a pressure regulator, which is a part of the fuel supply system.
FIG. 5 shows a pressure regulator similar to the o
REFERENCES:
patent: 2722208 (1955-11-01), Conroy, Jr.
patent: 2737167 (1956-03-01), Dickey
patent: 2958318 (1960-11-01), Ball
patent: 3170005 (1965-02-01), Phillips
patent: 3590839 (1971-07-01), Moore
patent: 4602656 (1986-07-01), Nagashima et al.
patent: 4633843 (1987-01-01), Wissmann et al.
Engman Thomas
Eriksson Dan
Aktiebolaget Electrolux
Moulis Thomas N.
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