JPS6098122A - Suction valve gear for internal-combustion engine - Google Patents

Abstract

PURPOSE:To produce two directional suction air streams inside a cylinder as well as make up a complex swirl stream in a way of making these opposed streams collide with each other inside a main combustion chamber and accerate a combustion speed, by situating the center of a shroud of a suction valve in a position directing at a cylinder central direction. CONSTITUTION:A concave-form main combustion chamber 4 is formed at the side of a cylinder head 8 right beneath an exhaust valve 3, and a spark plung 5 is installed inside the main combustion chamber 4. A setup position of a shroud 2 of a suction valve 1 is made so as to cause a shroud center M to direct toward a cylinder center N whereby such an air stream as opposing arrows A and B each other is produced there, and with these air streams made into collision inside the main combustion chamber, a complex swirl stream is produced, accelerating the combustion speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an intake valve device for an internal combustion engine having a main combustion chamber directly below an exhaust valve in a cylinder head.

[Prior art]

Conventionally, the spark plug and fuel injection nozzle were placed in the combustion chamber at 1nu.
However, in electrodeposited internal combustion engines, which inject fuel directly into the combustion chamber and create a mixture with intake air, which is then ignited by a spark plug and combusted, fuel consumption is uneconomical. There is a risk that the starting ignition and combustion efficiency still require improvement, but in the case of the type where the fuel injection timing is earlier than top dead center, the injected fuel may not reach the liner wall cooled by cooling water. In this case, complete consumption of fuel cannot be expected and oil dilution may occur.

Therefore, in order to solve this problem, we formed a main combustion chamber with four people on the cylinder head side, and by pressurizing the intake swirl into this chamber at the end of the compression stroke, we increased the swirl ratio and the fuel injected into the main combustion chamber In addition to improving atomization through diffusion and mixing with air, a shroud is installed on the intake valve to allow the spark of the ignition plug to fly near the end of fuel injection in the main combustion chamber, igniting the combustion, and transferring the combustion to the full mixture. Japanese Utility Model Publication No. 49-37684 has been devised to provide a shroud, but in this case, the placement position of the shroud is not limited and the direction of the intake airflow is unidirectional, resulting in a poor fuel consumption rate. there were.

Further, an internal combustion engine having a similar main combustion chamber directly below the exhaust valve is also exemplified in the invention of JP-A-50-107309, but in this case, there is a groove that guides a strong flow into the vortex chamber that is the main combustion chamber. It is necessary to provide it on the cylinder head side, and there is a disadvantage that the processing is done on both sides.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned conventional drawbacks and improve combustion efficiency and fuel consumption rate by increasing the combustion speed in the main combustion chamber of an internal combustion engine having a main combustion chamber directly below the exhaust valve. This is what I did.

[Structure of the invention]

That is, the intake valve device for an internal combustion engine of the present invention is an internal combustion engine having a main combustion chamber on the cylinder head side directly below the exhaust valve, in which the intake valve is provided with an opposing shroud for generating airflow inside the main combustion chamber, and It is constructed by locating the center of the shroud toward the center of the cylinder.

〔Example〕

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a partially sectional side view of an intake valve in Embodiment 1 of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 1 is a plan view of a main part of a cylinder head of an internal combustion engine provided with the intake valve shown in FIG. 1, and FIG. 4 is a longitudinal cross-sectional view of the main part taken along line II in FIG. 3.

First, in this internal combustion engine, the cylinder head 8 has an intake port 6 and an exhaust boat 7, as shown in FIG.
An intake valve 1 and an exhaust valve 6 for opening and closing the intake boat 6 and the exhaust boat 7 are provided opposite to the upper surface of the engine 0.

Next, a concave main combustion chamber 4 is formed on the cylinder head 8 side directly below the exhaust valve 6, and a spark plug 5 is provided within the main combustion chamber 4 as shown in FIG.

Therefore, the intake valve 1 is provided with a shroud 2 located near the valve seat 11 as shown in FIGS. 1 and 2. I am trying to point it in the N direction,
Generate opposing airflows indicated by arrows A and H in FIG. 3, and
By causing these to collide within the main combustion chamber 4, a complex vortex is generated and the combustion speed is accelerated.

In the case of a mouth, it is preferable that the intake port 6 has a straight port shape that does not cause swirl, etc., and the intake valve 1 needs to be prevented from rotating by, for example, being prevented from rotating.

The shroud 2 provided on the intake valve 1 as described above has the effect of deflecting the flow of intake air taken in from the intake boat 6 in a predetermined direction. As shown in FIG. 6, which is a side view of FIG. 5, and FIG. 7, which is a side view of FIG. If connected to the shroud 2, the intake air will be rectified and flow left and right from the center of the shroud, reducing the resistance caused by the shroud 2 and increasing the intake efficiency.

In addition, ■ in FIG. 8A indicates the shroud position of the present invention,
■ indicates the conventional shroud position.

〔Effect of the invention〕

Therefore, in an internal combustion engine equipped with the intake valve device of the present invention,
A shroud installed on the intake valve creates intake air flows in two directions within the cylinder, and these opposing flows collide in the main combustion chamber to generate a rough vortex, increasing the combustion speed. As shown in Figure B, this has the effect of increasing combustion efficiency and thermal efficiency as well as improving fuel consumption rate compared to the conventional example.

The present invention can be effectively applied mainly to internal combustion engines having a main combustion chamber directly below the exhaust valve.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional side view of an intake valve in Embodiment 1 of the present invention, FIG. 2 is a side view of FIG. FIG. 4 is a plan view of the main part of the cylinder head, and FIG.
The figure is a side view of an intake valve in Embodiment 2 of the present invention, FIG. 6 is a plan view of FIG. 5, FIG. 7 is a side view of the intake valve in the ■-■ direction of FIG. A schematic plan view of the main parts of
FIG. 8B is a diagram comparing the thermal efficiency when the intake valve according to the present invention is used and when the intake valve according to the conventional example is used. 1...Intake valve 2...Shroud 6...Exhaust valve 4
...Main combustion chamber 8...Cylinder head M...Shroud center N...Cylinder center. Agent: Patent Attorney Makoto Ogawa − Patent Attorney No. 1” Ken Teru Patent Attorney Kazuhiko Saishita

Claims (1)

[Claims] In an internal combustion engine having a main max on the cylinder head side directly below the exhaust valve, a shroud for generating airflow facing the main combustion chamber is formed on the intake valve, and the center of the shroud is positioned toward the center of the cylinder. An intake valve device for an internal combustion engine characterized by: