JPS5849383Y2 - Intake port of direct injection internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the intake port of a direct injection internal combustion engine.

Conventionally, in order to speed up combustion and increase air utilization by creating a vortex in the air inside the cylinder of a direct injection internal combustion engine, air swirling around the cylinder axis, or so-called swirl, has been created. As a method for causing this phenomenon, there is a problem in that when an excessive air swirling speed is applied to a device equipped with a spiral intake port, the intake efficiency decreases and the engine performance may be deteriorated.

Therefore, there is a need for an intake port that can provide high flow characteristics and increase intake efficiency even during optimal swirl formation during combustion, thereby increasing the output of the engine.

Therefore, in order to solve the above-mentioned problems, the present invention aims to provide an intake port that can provide a high flow rate and high swirl characteristics.

That is, in the present invention, the center IA of the intake valve hole 1 and the exhaust valve hole 2
, 2B, on the upper part of the valve seat 8 on the side wall surface of the intake port 3 between the valves between the intake valve hole 1 and the exhaust valve hole 2. , intake valve hole 1
A substantially horizontal protrusion 9 protruding inward is provided, a concave wall portion 10 is provided downstream of the protrusion 9 in the intake air flow, and a vertical wall surface 12 connecting the valve guide portion 11 and the inner wall of the intake port 3 is provided with a protrusion 9 . It is constructed by arranging it above the portion 9.

Embodiments of the present invention will be described below with reference to the drawings.

First, in the embodiment of the present invention shown in FIGS. 1 and 2, the line connecting the centers 1A and 2B of the intake valve hole 1 and the exhaust valve hole 2 of the two-valve direct injection internal combustion engine In parallel directions, an intake port 3 and an exhaust port 4 are provided in the cylinder head 5 and are fitted with an intake valve 6 and an exhaust valve 7, respectively.

Therefore, the present invention forms a substantially horizontal protrusion 9 protruding inside the upper part of the valve seat 8 on the side wall surface of the intake boat 3 between the intake valve hole 1 and the exhaust valve hole 2, and furthermore, the protrusion 9 A concave wall surface portion 10 having a shape outside the diameter of the intake valve hole 1 is formed at a position downstream of the intake flow.

Further, a vertical wall surface 12 connecting the inner wall of the intake port 3 with a valve guide portion 11 for the intake valve 6 that projects downward from the upper wall surface within the intake port 3 is disposed above the protrusion 9.

Incidentally, a cut hole 13 for cooling water is bored in the space between the valves where the protrusion 9 is formed to form a cooling water passage.

Next, to explain the function of the intake boat 3 in the embodiment of the present invention, the intake air flowing from the lower part of the inlet of the intake port 3 flows along the lower surface of the intake port 3 to the valve seat 8 and the intake valve 6. The intake air flows into the cylinder 14 at once from the gap and becomes an intake air flow A'.

On the other hand, the intake flow B flowing in from the upper part of the inlet of the intake port 3 is directed toward the near side shown in FIG. After being reflected to the side, it turns around the intake valve hole 1.

Therefore, in the conventional intake port 3, the protrusion 9 formed between the valves prevents the intake air flow B that partially flows into the cylinder 14 while rotating from flowing out, and further After the intake air flow B is collected by the protrusion 9 of the valve seat 8, it is reflected by the curved wall surface of the concave wall part 10 located downstream of the intake air flow B.
and the intake valve 6 like an intake flow B',
It is made to merge with the intake air flow A'.

Therefore, the intake air flows A' and B' flow out substantially parallel to the angle of inclination of the lower surface of the valve seat 8, resulting in good flow characteristics and proper swirl formation.

According to the present invention, the intake valve hole 1 is placed on the upper part of the valve seat 8 on the side wall surface of the intake port 3 between the intake valve hole 1 and the exhaust valve hole 2.
A substantially horizontal protrusion 9 protruding inward is provided, a concave wall portion 10 is provided downstream of the protrusion 9 in the intake air flow, and a vertical wall surface 12 connecting the valve guide portion 11 and the inner wall of the intake port 3 is provided with a protrusion 9 . Since it is disposed above the portion 9, the intake air flow flowing into the intake port 3 can be reflected toward the front side by the vertical wall surface 12, and can be further accumulated at the protrusion 9 formed between the valves.

Therefore, compared to an intake port which is not provided with the vertical wall surface 12, the intake air flow can be more sufficiently accumulated at the protrusion 9 provided at the lower part of the vertical wall surface 12 between the valves, so that the intake air flow can be more efficiently collected. It can provide excellent high flow characteristics.

In addition, since the vertical wall surface 12 is disposed above the protrusion 9, the intake air flow A flowing in from the lower part of the inlet of the intake port 3
The vertical wall surface 12 reflects the intake air flow B flowing from the upper part of the intake boat 30 to the front side without obstructing the flow of air into the cylinder 14 along the lower surface of the intake port 3 all at once. Further, after being accumulated at the protrusion 9, the air can be allowed to flow into the cylinder 14 through the curved wall surface 10-, where it can be merged with the intake air streamer.

Therefore, according to the present invention, it is possible to obtain intake air with a high intake air flow rate and high swirl characteristics, which speeds up combustion in the engine.
Moreover, the air utilization rate can be increased and the combustion performance of the engine can be improved.

The intake port of the present invention can be particularly effectively applied to a two-valve direct injection internal combustion engine.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view of the main part of the intake boat in an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the main part of the intake boat shown in FIG. 1... Intake valve hole, 1A... Center, 2...
...Exhaust valve hole, 2B...Center, 3...
...Intake port, 9... Protrusion, 10...
...Concave wall part, 11... Valve guide part, 12...
... Vertical wall surface.

Claims (1)

[Scope of utility model registration request] In the intake port 3 provided in a direction substantially parallel to the line connecting the centers IA and 2B of the intake valve hole 1 and the exhaust valve hole 2,
A substantially horizontal protrusion 9 protruding into the intake valve hole 1 is provided on the side wall surface of the intake port 3 between the intake valve hole 1 and the exhaust valve hole 2 at the upper part of the valve seat 8. An intake port of a direct injection internal combustion engine, in which a concave wall surface 10 is provided at a position downstream of the intake flow of the intake port 9, and a vertical wall surface 12 connecting the valve guide section 11 and the inner wall of the intake port 3 is disposed above the protrusion 9. .