JPH0417779Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to an intake system for an internal combustion engine.

[Conventional technology]

In order to improve the intake swirl and intake efficiency of a diesel engine, the methods described in Japanese Utility Model Application Laid-open No. 59-96328 and those shown in FIGS. 5 to 7 are known.

5 to 7, a partition plate 18 that divides the intake passage 16 into two passages is installed in the intake passage 16 that guides the intake air in the intake manifold to the combustion chamber 14. An intake valve 20 is provided along the center A, and an intake valve 20 is provided between the intake passage 16 and the combustion chamber 14, and the valve axis B of the intake valve 20 is set from the vertical axis A of the intake passage 16 to the center side of the combustion chamber 14. The intake passage 16 is provided by being displaced by a predetermined amount α to
A, 16B, the intake air flows through the combustion chamber 1 while forming a swirling flow on the bulk part 20A of the intake valve 20.
4 to improve intake swirl and intake efficiency. Note that FIG. 10 shows the cylinder head.

[The problem that the idea attempts to solve]

However, in the conventional device, the intake flow passing through the intake passages 16A, 16B is
There was interference above the umbrella portion 20A, the intake swirl was disturbed, and the intake efficiency could not be sufficiently increased.

Furthermore, there is an intake system for an internal combustion engine as disclosed in Japanese Patent Application Laid-Open No. 55-40277, but the partition plate (deflection guide plate) whose shape is twisted from horizontal to tilted prevents interference at the bulk part of the intake valve. This cannot be sufficiently prevented, and there is a risk that disturbances in the intake swirl will occur, making it impossible to sufficiently increase intake efficiency. Further, a strong swirling flow cannot be formed above the bulk part of the intake valve, and an optimum swirl cannot be generated within the combustion chamber.

The present invention was made in view of the above-mentioned conventional problems, and its purpose is to provide an internal combustion engine that can improve intake swirl and intake efficiency, and can generate optimal swirl within the combustion chamber. The purpose is to provide an intake device for

[Means to solve the problem]

In order to achieve the above object, the present invention includes a partition plate that divides the intake passage into two passages, an intake valve that is provided between the intake passage and the combustion chamber, and a partition plate that divides the intake passage into two passages. In an intake system for an internal combustion engine in which the valve axis is displaced with respect to the vertical axis of the intake passage, the partition plate is provided with the valve axis of the intake valve displaced with respect to the vertical axis of the intake passage. The partition plate is disposed at the entrance of the intake passage, and the extension line of the partition plate passes through the upper part of the intake valve, and the plate is inclined so that the side where the intake valve is located is higher. It is characterized by being provided from the to the exit.

[Effect]

By the partition plate composed of the above-mentioned sloping plates,
The intake passage is divided into an upper intake passage with a large cross-sectional area and a lower intake passage with a small cross-sectional area, and one of the airflows passes through the upper intake passage with a large cross-section, flows on the upper side of the passage, and reaches above the bulk of the intake valve. The air is supplied to the combustion chamber while forming a strong swirling flow, while the other air flow passes through the lower intake passage with a small cross-sectional area and flows at the bottom of the passage, so the flow is relatively weak due to flow resistance.
It is concentrated in the bulk part of the intake valve and is supplied to the combustion chamber.
Therefore, the airflow flowing through the upper side of the intake passage and the airflow flowing through the lower side of the intake passage no longer interfere with each other above the bulk of the intake valve, and turbulence in the intake swirl is also eliminated, improving intake swirl and intake efficiency. .

In addition, the strength of the airflow flowing through each divided passage is maintained up to the intake passage exit by the partition plate from the inlet to the outlet, and the strength of the airflow flowing through the upper intake passage side, which has a small cross-sectional area, is maintained. Due to the strong airflow flowing on the lower intake passage side of the cross-sectional area, a strong swirl occurs above the bulk of the intake valve.
Optimal swirl occurs within the combustion chamber.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIGS. 1 and 2 show an embodiment of an intake system for an internal combustion engine according to the present invention.

In the figure, 16 is an intake passage formed in the cylinder head 10. An intake valve 20 that opens and closes the intake passage 16 is provided between the intake passage 16 and the combustion chamber 14 . The valve axis B of the intake valve 20 is displaced by a predetermined amount α toward the center of the combustion chamber 14, for example, with respect to the vertical axis A of the intake passage 16. Inside the intake passage 16, there is a partition plate 18 that divides the intake passage 16 into two passages 16A and 16B.
is provided. The partition plate 18 is displaced toward the side where the valve axis B of the intake valve 20 is located, which is displaced by a predetermined amount α toward the center of the combustion chamber 14 with respect to the vertical axis A of the intake passage 16. The extension line is the intake valve 20
Passing through the position above the bulk part 20A and the intake valve 2
The intake passage 16 is divided into an upper intake passage 16A having a large cross-sectional area and a lower intake passage 16B having a small cross-sectional area.

Further, this partition plate 18 is provided from the inlet 16a of the intake passage 16 to the outlet 16b.

According to this intake system for an internal combustion engine, the intake passage 16 is divided into an upper intake passage 16A having a large cross-sectional area and a lower intake passage 16B having a small cross-sectional area, and one air flow passes through the upper intake passage 16A having a large cross-sectional area. The bulk part 2 of the intake valve 20 flows along the upper side of the passage.
Above 0A, the fuel is supplied to the combustion chamber 14 while forming a relatively strong swirling flow as shown by the broken line arrow in FIG.

The other air flow passes through the lower intake passage 16B, which has a relatively large flow resistance and a small cross-sectional area, and flows relatively weakly at the lower part of the passage, and as shown by the solid line arrow in FIG. 20A is concentrated and supplied to the combustion chamber 14 as it is.

Therefore, the air flow flowing through the upper side of the intake passage 16 and the air flow flowing through the lower side of the intake passage 16 are connected to the intake valve 20.
The interference above the umbrella portion 20A is eliminated, and the disturbance of the intake swirl is also eliminated, and as a result, the third
As shown in the figure, the intake efficiency can be increased, and as shown in FIG. 4, the intake swirl can be strengthened, and the intake swirl and intake efficiency can be improved.

Also, the partition plate 18 is connected to the entrance 16a of the intake passage 16.
If the airflow is provided from
The air is maintained as it is until it reaches the outlet 16b, and the air flow flowing through the upper intake passage 16A side having a large cross-sectional area has a lower flow resistance than the air flow flowing through the lower intake passage 16B side having a small cross-sectional area, which is a relatively strong air flow. A strong swirl is generated above the bulk portion 20A of the valve 20, and an optimum swirl can be generated within the combustion chamber 14.

[Effect of idea]

As explained above, according to the present invention, excellent effects can be obtained in that intake swirl and intake efficiency can be improved, and optimal swirl can be generated within the combustion chamber.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
The figure is an enlarged sectional view of the main part along the - line in Figure 1, Figure 3 is a characteristic diagram showing the relationship between engine speed and intake efficiency, and Figure 4 is a characteristic diagram showing the relationship between engine speed and swirl. , FIG. 5 is a cross-sectional view of a conventional device, FIG. 6 is an enlarged cross-sectional view of the main part taken along the line - in FIG. 5, and FIG. 7 is a top view of FIG. 5. 10... Cylinder head, 14... Combustion chamber, 1
6, 16A, 16B... Intake passage, 16a... Inlet, 16b... Outlet, 18... Partition plate, 20...
Intake valve, A... vertical axis center of intake passage, B... valve axis center of intake valve.

Claims (1)

[Scope of utility model registration request] A partition plate is provided in the intake passage to divide the intake passage into two passages, an intake valve is provided between the intake passage and the combustion chamber, and the valve axis of the intake valve is aligned with the vertical axis of the intake passage. On the other hand, in an intake system for an internal combustion engine that is provided displaced, the partition plate is displaced to the side where the valve axis of the intake valve is provided displaced with respect to the vertical axis of the intake passage, and the partition plate is extended. The partition plate is constructed of an inclined plate such that the line passes above the bulk of the intake valve and is higher on the side where the intake valve is located, and the partition plate is provided from the entrance to the exit of the intake passage. Features of internal combustion engine intake system.