JPS5965556A - Scavenging passage and intake passage of internal- combustion engine - Google Patents

Abstract

PURPOSE:To obtain better combustion by installing an eddy chamber on a part of a scavenging passage, which connects a crank chamber to the inside of a cylinder, thereby accelerating fuel evaporation and damping gas vibration. CONSTITUTION:When the gas in a crank chamber 2 is compressed as a piston goes down, scavenging air enters from the crank chamber 2 into a cylindrical eddy chamber 6, which is installed on a part of a connection passage 4, via the connection passage 4. At that time, since the connection passage 4 is placed a little off the cylinder axis, the scavenging air including liquid fuel is rotated at a high speed within the eddy chamber 6, resulting in accelerated evaporation of the liquid fuel. In addition, the location of an exit 7 of the eddy chamber 6 to a scavenging passage 8, which is led to the inside of a cylinder, is chosen in such a manner that the exit 7 projects inward from the wall of the eddy chamber 6 and besides scavenging air from the connection passage 4 does not directly reach the exit 7. As a result, in the eddy chamber 6, liquid component is rotated along the cylindrical wall, while gaseous component is rotated at the central part of the cylinder so that evaporated fuel can efficiently be supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air passage and an intake passage of a premixed internal combustion engine.

/ Among premixed internal combustion engines, the problem of air-fuel mixture generation remains an important issue.

In particular, with small 2-cycle gun ports, there is a lot of residual gas in the cylinder under medium loads, and there is communication between the crank chamber and the cylinder during the scavenging period +71J, so irregular combustion and abnormal combustion are likely to occur. )' occurs, it adversely affects the crank chamber and intake system as gas pressure fluctuations, promoting cycle fluctuations in the amount of air-fuel mixture and air-fuel ratio, and causing irregular combustion and abnormal combustion to continue.

If a fuel with poor vaporizability, such as kerosene, is used, the problem of air-fuel mixture generation and IC will further worsen the burn, making it unusable.

The inventor installed a vortex chamber in the middle of the scavenging passage, and by generating a strong vortex flow within the vortex chamber, the inventor promoted the vaporization of the fuel and also suppressed the vibration of the gas passing between the cylinder and the crank chamber.
By attenuating the vortex chamber (':l) and preventing pressure fluctuations from the cylinder from having an adverse effect on the crank chamber and intake system, it suppresses cycle fluctuations in the air-fuel mixture and air-fuel ratio, thereby reducing the Needless to say, we have found that good combustion can be obtained even when operating on kerosene.

The present invention improves combustion by generating a good air-fuel mixture without complicating conventional engines, thereby improving thermal efficiency. The purpose is to provide institutions.

A feature of the present invention is to promote fuel evaporation in a part of the scavenging passage of a two-stroke engine or the intake passage of a four-stroke engine,
The reason is that a vortex chamber is provided to obtain a good mixture.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 shows a part of the scavenging passage of a small two-stroke internal combustion engine to which the present invention is applied.

In Figure 1, as the piston descends, the crank chamber (2)
When the gas inside is compressed, scavenging air flows from the crank chamber through the communication passage (4) into the cylindrical vortex chamber (6).

If the communication passage (4) is provided at a position shifted from the cylinder axis as shown in Fig. 1, the scavenging air containing liquid solvent will be +Ii
'+i Rotates at 6th speed indoors. The liquid fuel quickly vaporizes due to the relative interaction between the liquid and gas produced by this u2 and the heat transfer from the vortex chamber wall.

Outlet to the scavenging passage (8) leading from the vortex chamber into the cylinder (
7) protrudes from the wall of the vortex chamber inward as shown in the figure, and if the scavenging from the communicating passage (4) is set at 17', e so that it does not directly reach the vortex chamber outlet (force), the liquid in the vortex chamber is The fuel components rotate near the cylindrical wall or form a flow adhering to the wall surface, but the gaseous components rotate in the recessed part of the chamber, so the fuel components, starting from the vaporized ones, are sequentially passed through the scavenging passage as part of the scavenging air. 8
) and fed into the cylinder.

The vortex chamber shown in FIG. 1 has a damping effect on gas vibrations between the crank chamber and the cylinder, and also acts to prevent combustion gas from blowing back from the cylinder to the crank chamber.

In this way, by providing a vortex chamber that generates a vortex that rotates at high speed in a part of the scavenging blood path, it promotes fuel vaporization and equalization of the air-fuel ratio in each cycle, and at the same time, it helps reduce gas vibration and combustion gas blowback. This suppresses the scavenging cycle fluctuations and greatly contributes to improving the dA.0 If the vortex chamber wall is heated or a heating device is inserted into the vortex chamber, fuel vaporization is accelerated by 1 to 2'', improving startability. It is effective for the change of the valley.

In addition to the structure of the vortex chamber shown in FIG. 1, any shape that generates a vortex can have the same effect as described above.

Of course, the same effect as described above can be obtained by placing such a vortex chamber in the middle of the intake pipe of a 2-cycle/I/40A engine, a 4-stroke engine, or a rotary Tsuruoka engine.

In Figure 2, the vortex chamber is heated by an electric heater, and the product 4i1
This shows a structure that promotes vaporization in a 1ξ direction, and is an example of a heated vortex chamber.

In FIG. 2, the air-fuel mixed fluid containing liquid fuel that has flowed into the vortex chamber (6) from the vortex chamber entrance (5) rotates at high speed within the vortex chamber, and the liquid component flows on or near the wall surface of the vortex chamber. At this time, when the vortex chamber wall is heated by the electric heater (9), the liquid fuel flowing on or near the wall surface quickly evaporates, and the J! The gas flows out from the vortex chamber outlet (7) as gas, and is finally supplied into the cylinder where it is combusted.

If this heating type vortex chamber is used, it can be easily operated not only with gasoline, alcohol, and kerosene, but also with gas oil, which is difficult to vaporize.

The heating of the heating type vortex chamber may be carried out continuously, or heating or non-heating may be switched back and forth as necessary.

In addition, in such a heated vortex chamber, if the vortex chamber is first heated to a predetermined temperature or higher before starting the engine, and then the Buddhist gate is cranked, fuels such as gasoline, alcohol, kerosene, and oil can be used even in winter. Easy to start. In this case, the cranking operation after reaching a predetermined temperature may be performed using either a manual switch or an automatic switch, or in some cases, a time period from the start of heating may be set, and the cranking operation may be started by this. good.

As described above, according to the present invention, the startability of a premixed internal combustion engine is improved by forming a simple (1"Q-shaped vortex chamber) in a part of the scavenging passage or the intake passage. By changing the f';

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example in which the present invention is applied to a scavenging passage of a two-stroke engine. (1) Crankshaft center, (2) Crank chamber, (6) Crank case, ( 4)... Communication passage between the crank chamber and the whirlpool chamber, (5)... the whirlpool chamber entrance, (6)
... vortex chamber, (7) ... vortex chamber outlet, (8) ... scavenging passage leading from the vortex chamber into the cylinder. Figure 2 is a diagram showing an example of a pasted type vortex, (5)...vortex chamber entrance, (6)...vortex chamber, (7)...
- Vortex chamber outlet, (9)... electric heater. Figure 1 (1) [Δ 2 (5)

Claims (7)

[Claims] (1) A scavenging passage for a crank chamber compression type two-stroke internal combustion engine in which a vortex chamber is provided in a part of the scavenging passage that communicates between the crank chamber and the inside of the cylinder. (2) A scavenging passage without a swirl chamber is provided in addition to the scavenging passage mentioned in "Qtu area (1) of special claim 1" above, and scavenging is performed through one or both of the scavenging passages depending on the operating conditions of the engine. A two-stroke internal combustion engine with a compressed crank chamber. (3) An intake passage for an internal combustion engine, characterized in that a vortex chamber is formed in a part of the intake passage communicating with an intake hole formed in a cylinder or a cylinder head. (4) An internal combustion engine characterized by forming a #1'6 chamber in a part of the intake passage that connects to the intake hole formed in the cylinder or cylinder head, and supplying fuel to the swirl chamber. Engine intake passage. (5) Above [special i'r' 6+i search) range (6),
(4) An internal combustion engine in which an intake passage without a vortex chamber is provided outside the J-nol & air passage, and intake air is supplied through one or both intake passages depending on the operating conditions of the engine. (6) Above “Special feature 1 (1.Claims (1), (2))
, (6), (4), and (5)'' by drying water, exhaust, electric heaters, or other methods, or using a heating device I'
A scavenging passage and an intake passage for an internal combustion engine, characterized in that a vortex chamber is inserted into a vortex chamber. (7) In an internal combustion engine with an electric starter having a scavenging passage or an intake passage described in "Patent i!l'J Scope (5)", heating of the vortex chamber is first started after the engine start switch is turned on; An internal combustion engine in which cranking of the engine is started after a certain period of time or after the temperature of a vortex chamber reaches a certain temperature.