JPS5891328A - Suction device of internal-combustion engine - Google Patents

Abstract

PURPOSE:To prevent blowing back of a gaseous mixture by arranging an auxiliary chamber between cylinders in which, when the suction port of one of cylinders is opened, the suction port of another is closed, dividing the auxiliary chamber, and connecting respective divided chambers to suction passages of respective cylinders. CONSTITUTION:When the cylinder 10 is in a suction step, suction of air is carried out from a carbureter 17 through a suction passage 16. The suction passage 16 is put into a negative pressure and a diaphragm 21 moves in left hand and assumes a state shown by solid lines. Thus, the gaseous mixture withing a divided chamber 22 is sucked up into the cylinder 10. The cylinder 11 is in an explosion step and the suction port 14 is closed. Hence, the gaseous mixture sucked up from a carbureter 19 flows into a divided chamber 23. When the cylinder 11 is put into the suction step, the diaphragm 21 assumes a state shown by the broken lines by the negative pressure within a suction passage 18, and the gaseous mixture within the divided chamber 23 is sucked up in the clyinder 11. The gaseous mixture from the carburettor 17 flows into the divided chamber 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake system for a Fi1 internal combustion engine. More specifically, the present invention mainly relates to an intake system for a multi-cylinder gasoline engine.

In a conventional 4-cycle gasoline engine, as shown in Figure 1, when the intake port 1 is closed by the intake pulp 2, the air-fuel mixture that had been drawn into the cylinder through the intake passage 3 flows into the direction indicated by the arrow. Since it is pushed back as shown in the figure, the intake passage 3
If pulsation occurs inside the body and smooth intake is obstructed, K1
Since the 1 m pulsation also acts on the venturi section 4 of the carburetor, there is a problem that atomization of gasoline is inhibited. Also, in a two-stroke gasoline engine, as shown in Figure 2, when the piston 5 descends and the intake port 6 closes, mixed air is similarly pushed back in the direction of arrow A, causing pulsation, similar to the four-stroke engine. There were some inconveniences.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide an intake system for an internal combustion engine that can perform efficient intake by eliminating the inconvenience caused by intake pulsation that inhibits smooth intake or inhibits gasoline atomization. The gist of this is that in the intake system of a multi-cylinder internal combustion engine, there is a gap between at least two cylinders in which when the intake port of one cylinder is open, the intake port of the other cylinder is substantially closed. An auxiliary chamber is provided, a movable partition is provided in the auxiliary chamber to divide the interior of the auxiliary chamber, the intake passage of one cylinder is communicated with one divided chamber of the auxiliary chamber, and the intake passage of the other cylinder is connected with the other divided chamber. An intake system for an internal combustion engine, characterized in that the air intake system communicates with a divided chamber.

The present invention is applicable to both 2-cycle and 4-cycle self-melting engines.The present invention is mainly applicable to multi-cylinder internal combustion engines, where the number of cylinders is an even number, such as 2 cylinders, 4 cylinders, 6 cylinders, etc. And it can be suitably applied when one carburetor is provided per cylinder.

The present invention will be described in detail below with reference to the embodiments shown in the drawings. Figure 3 is a cross-sectional conceptual diagram showing an embodiment of the intake system according to the present invention, and is suitable for use in an even-numbered cylinder four-stroke gasoline engine. All applied items are shown.

In the figure, there are 10 and 11 cylinders, and both air f! 11
0°11 means that the intake port 12 of one cylinder 10 is the intake valve 1.
When open by 3 1 intake port 1 of the other cylinder 11
4 or intake valve 15 K k-D is in a substantially closed state, that is, a pair of cylinders that are not in the same phase 01
6 is an intake passage of the cylinder 10, 17 is a carburetor provided in the intake passage 16, and 18 is an intake passage of the cylinder 11 to 19 is a carburetor of 18 KW. 20 is both cylinders 10 and 11
A movable partition wall 21 that moves according to the pressure difference is provided in the auxiliary chamber 20 to divide the interior of the auxiliary chamber, and one divided chamber 22 communicates with the intake passage 16 of one cylinder. The other divided chamber 23 is connected to the other intake passage 18. In this embodiment, the auxiliary chamber 20 is connected to a pair of cylinders 10 whose phase is shifted by 360@, that is, whose intake and exhaust strokes are shifted by 360". The cylinder 1o is in the intake stroke, and the cylinder 11 is in the explosion stroke.A diamond 7 ram chamber is used as the auxiliary chamber 20, and a diaphragm is used as the movable partition wall 21.

FIG. 4 is a diagram showing the relationship between both air cylinders @10 and 11 shown in FIG. 360
It's off by 6.

Next, the operation of this device will be explained with reference to FIG. 3. As shown in the figure, when the cylinder 10 is in the intake stroke, intake air is forced from the carburetor 17 through the intake passage 16.
The diaphragm 21 moves to the left in the figure due to the food pressure inside, as shown by the solid line, and the air-fuel mixture in the divided chamber 22 is also sucked in. At this time, cylinder 1 is in the explosion stroke. Since the intake port 14 is closed, the air-fuel mixture taken in from the carburetor 19 moves to the left of the diaphragm 21 and flows into the divided chamber 23 of the diaphragm chamber. Next, the cylinder At the Xt#@air stroke, air is taken in from the carburetor 19 through the intake passage 18, and at the same time the diaphragm 21 moves to the right in the figure due to angular pressure, resulting in the state shown by the broken line and the mixing of potash and potash in the divided chamber n. At this time, the cylinder 1o is in the explosion stroke, and as in the above case, the carburetor 17
The air-fuel mixture sucked in from the air-fuel mixture flows into the divided chamber 22.

Even in the case of a 2-cycle engine, if this device is applied, the same effect as in the case of the 4-stroke engine described above will be performed.
In the case of a citral, it is preferable that the pair of cylinders in which the auxiliary chamber 20 is provided are out of phase by 36σ, but in the case of a two-stroke, it is preferable to have cylinders out of phase of 180°. (1) The blowback of the air-fuel mixture in the intake passage that occurs when the intake port closes is reduced, and the air intake is carried out efficiently, especially at low and medium speeds. (2) There is less pulsation to the carburetor venturi, which improves fuel atomization.

(3) Since there is less blowback to the carburetor, there is less dirt on the air cleaner◎ Note that the present invention can be applied to an Otto cycle engine, and even in the case of a single cylinder engine, as shown in Fig. 3. A similar effect can be obtained by communicating one of the divided chambers with the intake passage and opening the other divided chamber to the atmosphere. Furthermore, the present invention is not limited to the illustrated embodiment, but may include an auxiliary chamber in the intake passage. By providing a movable wall in the auxiliary chamber that moves according to the pressure in the intake passage, the air-fuel mixture in the auxiliary chamber is also sucked in during the intake stroke, and the mixture is pushed back when the intake port is closed. Various modifications can be made within the scope of the gist of the present invention, which is configured so that the water flows into the auxiliary chamber.
The number of divided chambers provided in the auxiliary chamber and the number of cylinders communicating with the auxiliary chamber can be determined as appropriate.

[Brief explanation of the drawing]

1 and 2 are conceptual cross-sectional views showing air-fuel mixture blowback in a conventional internal combustion engine, FIG. 3 is a conceptual cross-sectional view showing an embodiment of the intake device according to the present invention, and FIG. It is a diagram showing the relationship between the two party cylinders. 10.11...Cylinder, 12, 14.
...Intake port, 16.18...Intake passage.
20... Auxiliary room, 21... Movable bulkhead, 22, 23... Divided room. Figure 1 Figure 2 Procedural amendment (voluntary) January 7, 1982 Patent application No. -188562 2, Title of invention Intake device for internal combustion engine 38 Relationship with the case of the person making the amendment Patent applicant Contents of address correction (1) Change “mixed air” on page 2, line 12 of the specification to “mixed air”
I am corrected. (2) In the first line of page 6, correct [1 for the air-fuel mixture as for the air-fuel mixture to ``ta-air-air mixture.'' (3) Add the following sentence after "Has an effect." on page 7, line 2. Note 1 In this case, as shown in FIG. 5, a spring 25 may be disposed in one of the divided chambers 22 communicating with the intake passage to appropriately restrict leftward movement of the diaphragm 21. Effects can be obtained. This is because if the other divided chamber path is opened to the atmosphere, the diaphragm 21 will be constantly pushed toward the divided chamber 22 side (left side) that communicates with the intake passage, and there is a risk that the operation will be insufficient. (4) "It is a diagram showing" on the 17th line of page 7 indicates 1, and FIG. 5 is a cross-sectional conceptual diagram showing an embodiment of a single-cylinder intake device. ” he corrected. (5) Add Figure 5 on the attached sheet to the drawings. that's all

Claims (1)

[Claims] In the intake system of a multi-cylinder white light engine (c), there is an auxiliary system between at least two cylinders in which when the intake port of one cylinder is open, the intake port of the other cylinder is substantially closed. A movable partition is provided in the auxiliary chamber to weigh the inside of the auxiliary chamber, and the intake passage of one cylinder is connected to one of the divided chambers of the auxiliary chamber, and the intake passage of the other cylinder is connected to the intake passage of the other cylinder. An intake system for an internal combustion engine that is patented in that it communicates with the other divided chamber.