JPS63173837A - Two stroke internal combustion engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a two-stroke internal combustion engine, and more particularly to a two-stroke internal combustion engine supplied with liquefied or compressed fuel gas as fuel.

[Prior Art and Problems to be Solved by the Invention] Two-stroke or two-cycle engines are well known and use liquid petroleum as fuel, and the moving elements in the crankcase are lubricated by oil. . Most commonly, this oil is premixed with the liquid fuel in a typical ratio of 1:50 by weight and introduced into the combustion chamber via the carburetor brake. Liquefied fuel gases typically consist of propane, butane and other gaseous hydrocarbons and are well known as heating and lighting fuels as well as fuels for internal combustion engines. As used herein, the term liquefied fuel gas refers to a combustible gas that is gaseous at ambient temperature and atmospheric pressure but normally stored in a liquid state under pressure. These gases are typically obtained from natural gas or oil fields. The fuel gas also includes combustible gases produced synthetically or from the decomposition of waste products. The term fuel gas also includes common combustible gases, including hydrogen. As used herein, the term compressed fuel gas refers to combustion gas that is stored at a pressure greater than atmospheric pressure. Despite widespread availability and low cost, liquefied or compressed gases have until now been limited to four-stroke internal combustion engines. Until now, it was not known that liquefied fuel gas could be satisfactorily used as fuel for two-stroke engines.

[Means for solving problems]

Accordingly, the present invention provides a two-stroke internal combustion engine in its broadest form that is fueled by liquefied or compressed fuel gas.

In another form, the invention provides a method for supplying liquefied or compressed fuel gas, including means for introducing a jet of lubricating oil into the crankcase so that moving parts within the crankcase are lubricated. To provide a two-stroke internal combustion engine.

The known technology of direct oil lubrication of t 1ffi two-stroke engines can be applied to the present invention. In a preferred form, the lubricating oil is introduced into the engine by first diluting the lubricating oil with a combustible thinning solvent;
Means is then provided to atomize this solution in the air oil gas stream and then bring the atomized solution, air and fuel gas into the combustion chamber of the engine.

More preferably, the solution is introduced into the bowl of the carburetor and atomization is effected by the solution being drawn in via the main jet through the passage of air and fuel gas.

In a more preferred form, the combustible thinning solvent is liquid petroleum, and the preferred ratio of oil to liquid petroleum is about 1:4 to 1:20 by weight.

In a preferred embodiment, the two-stroke engine further comprises warning means adapted to indicate when no lubricating oil is introduced into the engine.

Preferably, the two-stroke engine further comprises means adapted to cool the engine with water, and even more preferably the means are adapted to introduce cooling water into a housing disposed about the exhaust manifold. ing.

The components of the lubricating oil and the liquefied or compressed fuel gas are not critical to the operation of the invention.

Preferred oils are oils that are compatible with known liquid petroleum fueled two-stroke engines, and preferred gases are gases that are compatible with four-stroke engines. The nature of the combustible thinning solution is also not critical; its primary function is to reduce the viscosity of the oil so that the solution of the oil in the solvent can be transported and atomized. However, it is preferred that the diluent solvent be volatile so that when it enters the combustion chamber it is vaporized and combusted in the air and fuel mixture.

Known methods ensure that the liquefied or compressed fuel gas is mixed with air in appropriate proportions before entering the combustion chamber of the engine.

The invention further includes reducing the viscosity of the lubricating oil by dissolving it with a combustible thinning solvent and spraying the solution into a stream of liquefied or compressed fuel gas and air. A method of operating a two-stroke engine is provided which comprises directing the fuel gas, air and atomized solution into a combustion chamber of the engine.

〔Example〕

Preferred embodiments of the invention will now be described with reference to the accompanying drawings.

Referring to the drawings, a reservoir 1 is shown and this reservoir 1 has 2
Contains a 1:8 solution 2 of stroke lubricating oil and liquid petroleum. This melt? f1.2 is shown flowing into the carburetor bowl 3 via the low pressure warning device 4. This low pressure warning device 4 detects the decrease in pressure when the reservoir 1 is emptied and closes an electrical circuit which activates an audible alarm.

It will be appreciated that the emptying of the reservoir may provide other warning or safety devices to prevent damage to the engine due to lack of lubricating oil. For example, an alarm detector may be disposed between the bowl 3 and the spray area 5 such that the alarm will be activated when the solution in the reservoir falls below a predetermined minimum level. can.

The solution 2 is sucked through the outlet orifice 6 of the carburetor 11!1 and is atomized by the passage of the mixture 7 of fuel gas and air, so that the fuel gas is in the gas form of liquefied or compressed petroleum gas. Solution 2 passes through needle valve 9 to orifice 6 . Each needle valve 9 has a diameter of 25
It has a 500μ hole diameter with 16 orthogonally communicating filter holes with a 0μ hole diameter. The gas and air are mixed in a known manner, which is not shown, nor is a liquefied petroleum gas reservoir of known configuration.

The gas, air and atomized solution are then drained.

It passes through the torque valve 8 and finally enters the combustion chamber of a two-stroke engine (not shown) via an inlet boat. This two-stroke engine is designed with the exception that extra cooling capacity is provided by the addition of a housing over the exhaust manifold so that cooling water can be introduced into this housing to further cool the engine. This is the same as a known two-stroke engine. When used as an outboard engine, cooling is provided to the housing on the exhaust manifold by pumping water through the rotation of the propeller. This extra cooling can be beneficial because two-stroke engines running on liquefied or compressed petroleum gas tend to generate more heat than engines using regular liquid fuel. Understood.

In operation, this engine was found to operate more efficiently than when run on regular oil. Furthermore, it is noted that there is less pollution, especially when used in ships. By discharging the solution from the bowl 3 with the cock 10 after stopping the supply of the solution 2 from the reservoir 1 to the bowl 3, it is possible to convert an engine operating on fuel gas into an engine operating on ordinary petroleum. The needle valve 9 is replaced by a regular bore 200μ needle valve and an oil supply is connected to the bowl 3.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a system for supplying liquefied or compressed fuel gas to a two-stroke engine. DESCRIPTION OF SYMBOLS 1... Reservoir, 2... Solution, 3... Bowl, 4... Alarm device, 5... Atomization area,
6... Orifice, 7... Air mixture, 9
... Needle valve, 10... Cock. The following is an engraving of the margin drawing (no changes to the content) 6. Written amendment to the procedure to be amended (method) % formula % 1. Indication of the case 1985 Patent Application No. 309306 2. Name of the invention 2-stroke internal combustion engine 3. Person making the amendment Relationship to the case Patent applicant 4. Agent Address: 8-10-5 Toranomon-chome, Minato-ku, Tokyo 105
Date of amendment order (1) Power of attorney (2) Drawing 7, Contents of amendment (1) As attached (2) Engraving of drawing (no change in content) 8. List of attached documents

Claims (1)

[Scope of Claims] 1. A two-stroke internal combustion engine characterized in that liquefied or compressed fuel gas is supplied as fuel. 2. A two-stroke internal combustion engine according to claim 1, characterized in that oil injection of lubricating oil is introduced into the crankcase so that moving parts within the crankcase are lubricated. 3. First introduce the lubricating oil into the engine by diluting it with a combustible thinning solvent, atomize this solution (2) in the air-fuel gas stream (7), and then introduce this atomized solution into the engine. (2) A two-stroke internal combustion engine according to claim 1, further comprising means for introducing air and fuel gas into the combustion chamber of the engine. 4. A two-stroke internal combustion engine according to claim 3, characterized in that the combustible thinning solvent is liquid petroleum, and the solution contains from 5 to 25% by weight of lubricating oil. 5. Any one of claims 3 and 4, characterized in that the engine is equipped with a warning means (4) for issuing a warning when the lubricating oil drops below a predetermined lower limit. The two-stroke internal combustion engine according to item 1. 6. Two-stroke internal combustion engine according to one of claims 1 to 5, characterized in that an additional cooling capacity is provided for the engine. 7. forming a solution (2) of a lubricating oil and a combustible thinning solvent; atomizing this solution (2) into a fuel gas, air; and the atomized solution (2); introducing fuel gas and air into a combustion chamber of the engine. 8. A two-stroke internal combustion engine used to drive an off-board motor system.