JPH0115845Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a mixed fuel tank used in a two-stroke engine.

[Conventional technology]

Generally, in a two-stroke engine, the inside of the crankcase is used as a pre-pressure chamber, so oil used as lubricating oil cannot be pooled in the crankcase, so normally fuel and oil are mixed in advance in an appropriate ratio. They are mixed to create a mixed fuel, and this mixed fuel is fed into the crankcase via a carburetor.

[The problem that the idea aims to solve]

By the way, in order to obtain the above-mentioned mixed fuel, an appropriate amount of oil is directly injected into the gasoline in the fuel tank to obtain it, which is not only complicated but also complicated. Obtain a fuel mixture with an appropriate mixture ratio of fuel and oil depending on the load of the two-stroke engine (i.e., increase the oil mixture ratio when the engine load increases, and increase the oil mixture ratio when the engine load decreases). Therefore, it is not possible to obtain a mixed fuel with a reduced mixing ratio of 2-stroke engines, and as a result, engine seizure or plug fogging is likely to occur, which is a cause of malfunction of 2-cycle engines.

In view of the above-mentioned circumstances, the object of this invention is to provide a mixed fuel tank that automatically obtains mixed fuel at an appropriate mixing ratio depending on the load of a two-stroke engine.

[Means to solve the problem]

In order to achieve the above-mentioned purpose, in this invention, one tank is divided into three chambers, the first chamber accommodates fuel, the second chamber accommodates oil, and the third chamber accommodates fuel. A mixing means consisting of an oil pump for mixing the fuel and oil contained in the first and second chambers at a mixing ratio according to the load of the engine is housed in the engine.

[Effect]

According to the above-mentioned mixed fuel tank, the amount of oil supplied by the oil pump changes according to changes in the engine load, so a mixed fuel with an appropriate mixing ratio according to the engine load can be automatically obtained in one tank. It will be.

〔Example〕

An embodiment of the mixed fuel tank according to this invention will be described in detail below.

FIG. 1 is a conceptual sectional view of a tank 2 showing a mixed fuel tank 1 according to the present invention.

This tank 2 includes a first chamber 4 containing fuel 3, a second chamber 6 containing oil 5, and a second chamber 6 containing fuel 3 and oil 5 for use in the engine. A third chamber 8 containing a mixing means 7 for mixing at a mixing ratio according to the load is formed.

Of these, the mixing means 7 accommodated in the third chamber 8
The motor 9 has a motor 9 whose rotational speed changes according to the load of a two-cycle engine (not shown) (that is, the rotational speed increases when the engine load increases, and decreases when the engine load decreases). The stirring chamber 11 is composed of an oil pump 10 driven by a motor 9, and a stirring chamber 11, and a stirring blade 12 driven by a motor 9 is accommodated in the stirring chamber 11. In addition, the stirring chamber 11 is provided with an oil pump 10.
It communicates with the second chamber 6 via oil pipes 13 and 14, and also communicates with the first chamber 4 via a fuel pipe 15. In addition, there are 11 stirring chambers.
communicates with a vaporizer (not shown) via a fuel pump 16 disposed outside the tank 1.

The fuel pump 16 sucks a required amount of fuel from the first chamber 4 through the stirring chamber 11 and the fuel pipe 15 according to the engine speed, and pumps it to a vaporizer (not shown).

Further, in FIG. 1, reference numerals 17 and 18 are fuel and oil injection ports, respectively, and 19 and 20 are caps that close the first and second chambers 2 and 4, respectively.

Next, the operation of the above-mentioned mixed fuel tank 1 will be explained, and the structure will also be explained in more detail.

When a two-stroke engine (not shown) starts, the motor 9 rotates according to the engine load (that is, faster when the engine load increases, and slower when the engine load decreases). The air pump 16 is rotated so that its discharge amount increases according to the engine speed. Further, when the motor 9 rotates, the oil 5 is pumped from the second chamber 6 by the oil pump 10 linked to the motor 9 in an amount corresponding to the engine load (that is, when the engine load increases, the oil 5 is pumped in an amount corresponding to the engine load). , or only a small amount if the engine load is reduced) through the oil pipes 13, 14 to the stirring chamber 11.
supplied within.

On the other hand, a fuel pump 16 is supplied from the first chamber 4.
Due to the suction force, fuel is supplied into the stirring chamber 11 through the fuel pipe 15 in an amount corresponding to the rotational speed of the engine. Furthermore, since a stirring blade 12 that is interlocked with the motor 9 is housed in the stirring chamber 11, the oil 5 and fuel 3 that have flowed into the stirring chamber 11 are controlled by the stirring blade 12 according to the load of the engine. The mixed fuel is uniformly mixed at the same mixing ratio, and is further supplied to a carburetor (not shown) by the fuel pump 16.

Note that the oil pump 10 used in the above embodiment
may be a plunger type or a gear type, in short, any type can be used as long as it sucks oil in an amount corresponding to the engine load from the second chamber 6 and pumps it into the stirring chamber 11. It is also good to use an oil pump.

In addition, in FIG. 1, the oil pipes 13, 1
4 or each pipe such as fuel pipe 15,
A check valve (not shown) is provided in each case to prevent backflow of oil or fuel.

[Effect of idea]

As explained above, in the mixed fuel tank according to this invention, fuel and oil are stored separately in a single tank, and the mixed fuel is mixed at a mixing ratio according to the engine load. Since a mixing means is installed to supply mixed fuel at a mixing ratio according to the operating conditions, it not only eliminates the need for complicated oil mixing work, but also eliminates the causes of malfunctions such as burning plugs in 2-cycle engines. A two-stroke engine can be operated stably. In addition, since the mixed fuel tank of the present invention can obtain a mixed fuel with a mixing ratio according to the operating condition of the engine using a single tank, the amount of oil discharged can be adjusted according to the engine load of the oil pump, etc. By using a general-purpose engine as a fuel tank for a generator, an outboard motor, etc. that uses a general-purpose engine for which there is no other means, we can eliminate the causes of malfunctions in equipment using such general-purpose engines, and thereby improve the performance of equipment using general-purpose engines. You can also try to improve it.

[Brief explanation of the drawing]

FIG. 1 is a conceptual sectional view of a mixed fuel tank according to this invention. 1... Mixed fuel tank, 2... Tank, 3...
Fuel, 4... First chamber, 5... Oil, 6... Second chamber, 7... Mixing means, 8... Third chamber, 10
...Oil pump.

Claims (1)

[Scope of utility model registration request] One tank is divided into three chambers, and the first
Fuel is stored in a second chamber, oil is stored in a second chamber, and the fuel and oil contained in the first and second chambers are mixed in a third chamber at a mixing ratio according to the engine load. What is claimed is: 1. A mixed fuel tank, characterized in that it accommodates a mixing means consisting of an oil pump, and is configured to obtain mixed fuel at a mixing ratio according to the engine load within one tank.