JPH04128543A - Two-cycle engine - Google Patents

Abstract

PURPOSE:To prevent wasteful fuel from being discharged into air by a spitting wind of a suction air passage by separately and individually providing a fuel supply passage to supply liquefied petroleum gas to an engine after evaporating it and a suction air passage to supply air. CONSTITUTION:A gas bomb 27 with liquefied petroleum gas in it is communicated with a cylinder 5 through a carbureter 35, a pressure regulator 37, a capacity regulator 39 and others, and an opening part 45 provided on a cylinder side wall surface where a fuel supply passage 43 opens is made to open and close by actuation of a piston 23. Subsequently, one end of a suction air passage 47 is communicated with an air cleaner 11 and the other end of it is communicated with a suction air hole 13 on a cylinder wall surface. Then, when the piston 23 descends and opens the suction air passage 47, air enters a cylinder 25 from the air cleaner 11 and fuel enters the carbureter 35 from the gas bomb 27 and is evaporated and sucked into a crank case 3 through the pressure regulator 37 and the capacity regulator 39 when the piston 23 ascends, and when the piston 23 descends, it is supplied to the inside of the cylinder 25, mixed with air, ignited and exploded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Field of Industrial Application) This invention relates to a two-stroke engine that uses liquefied petroleum gas sealed in a pressure vessel as fuel.

(Prior Art) Conventionally, this type of product has been supplied with fuel by mixing it with intake air through the engine's carburetor, etc., similar to a two-stroke engine that uses gasoline as fuel.

(Problem to be solved by the invention) Due to the structure of a two-stroke engine, during compression motion of the engine, until the intake passage is closed, fuel is released into the atmosphere due to the pressure difference between the pressure inside the crankcase near the intake hole and the atmospheric pressure. For this reason, when liquefied petroleum gas is mixed into the intake air in the same way as gasoline, the liquefied petroleum gas supplied to the fuel supply path flows into the carburetor even after the intake hole is closed when no supply is necessary. It is wasted as it is dissipated into the atmosphere through the air intake holes that open to the atmosphere due to the blowback wind. Also, is there a method of supplying the pressure at a pressure equal to or lower than atmospheric pressure?Due to the nature of liquefied petroleum gas, are there any differences in the constituent components for complete vaporization?A certain temperature is required [2. gas.

Since there is a mixture of liquids, it is difficult to supply fuel at the same suction negative pressure as with gasoline, and the pressure reducing device is also thick. The air intake passage and the air intake passage are provided separately and independently.

(Function) As the crankshaft rotates, the piston descends and the air intake passage opens, allowing atmospheric air to enter the cylinder from the air cleaner through the air intake passage.

Fuel enters the carburetor chamber from the gas cylinder and is vaporized, passes through a fuel supply path such as a pressure regulator and meter, and is sucked into the crankcase when the piston rises, and when the piston descends, it is supplied into the cylinder and becomes air. mixed into the liquid, ignited and exploded.

Therefore, even if there is a blowback wind in the air intake passage, since the fuel supply passage is provided separately, the fuel will not be wastefully discharged into the atmosphere together with the blowback wind.

(Embodiment) Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, a cylinder 5 is fixed above the crankcase 3 of an engine 1, and a muffler 7 is attached to one side of the cylinder 5.
An exhaust hole 9 is opened on the other side, and an intake hole 13 is opened on the other side, communicating with an air cleaner 11. crank case 3
One end of the crankshaft 15 is connected to the crank arm 17 provided on the crankshaft 15, and the other end of the connection 19 slides into the cylinder 5. Free piston 23 and piston pin 25
are connected via. A portable pressure vessel (hereinafter referred to as a gas cylinder) 27 filled with liquefied petroleum gas has a fuel discharge hole 29 at one end supported by a fitting 31, and the other end removably supported by a spring holder 33. A fuel supply path 43 is configured that communicates with the cylinder 5 via the chamber 35, the pressure regulator 37, the metering device 39, and the like. An opening 45 provided in the cylinder side wall surface through which the fuel supply passage 43 opens is connected to the piston 230.
It is configured to open and close when activated. The air suction path 47 has an air cleaner 11 and one end connected to the air cleaner]1.
It is composed of an intake pipe 49 whose other end communicates with the intake hole 13 in the cylinder wall, and the intake hole 13 .

In the embodiment described above, the fuel discharged from the gas cylinder 27 is supplied to the fuel supply path 43 through the receiving fitting 31, but due to the reciprocating movement of the piston 23 in conjunction with the movement of the crankshaft 15, the piston side wall is opened in the cylinder wall surface. Part 45
By opening and closing, the fuel supply passage 43 is opened and closed, so that fuel can be supplied to the engine in accordance with the timing of intake and exhaust, and since it forms a separate outlet from the air intake passage 47. The liquefied petroleum gas is not discharged directly into the air intake passage 47, and therefore the liquefied petroleum gas can be economically supplied without wasting the fuel into the atmosphere due to blowback wind.

Note that the pressure regulator 37 of the present invention can also have the function of the meter 39.

Furthermore, the effect remains the same even if the fuel supply path 43 and the air suction path 47 are arranged side by side in the same container or each is provided in a dedicated container.

[Effects of the Invention] According to the present invention, wasteful fuel is not released into the atmosphere due to the blowback of the air intake passage, and the supply of liquefied petroleum gas to the engine can be easily and economically controlled. be. Note that FIG. 2 shows another embodiment, in which the fuel supply passage 43 opens inside the crankcase 3, and the opening 5
1 is provided with a one-way opening/closing valve 55 which is closed in the opposite direction by a spring 53.

In FIG. 2, the same reference numerals as those shown in FIG. 1 represent the same components.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view of one embodiment of the present invention, and FIG. 2 is a side sectional view of another embodiment.

Claims (3)

[Claims] (1) A two-stroke engine characterized in that a fuel supply passage 43 for vaporizing liquefied petroleum gas and supplying it to the engine and an air intake passage 47 for supplying air are provided separately and independently. (2) The two-stroke engine according to claim 1, wherein the fuel supply passage (43) is provided as an opening in a side wall of the cylinder (5), and the opening is provided so as to be openable and closable by the operation of the piston (23). (3) The two-stroke engine according to claim 1, wherein the fuel supply passage 43 is opened inside the crankcase 3 of the engine, and a one-way opening/closing valve 55 is provided in the opening.