KR19980049268A - 4-valve internal combustion engine optimizes engine performance - Google Patents

Abstract

The present invention provides two exhaust valves in order to provide the optimum valve distribution in the combustion chamber at the start of ignition in a four-valve two-stroke internal combustion engine including two exhaust valves and two intake valves. In a four-valve two-stroke internal combustion engine comprising (2A, 2B) and two intake valves (3A, 3B), one of the two exhaust valves (2A, 2B) and the two intake valves (3A, One of the 3Bs is disposed to face each other, the two exhaust valves 2A, 2B and the two intake valves 3A, 3B are disposed adjacent to each other, and the four valves ( 2A, 2B, 3A, and 3B are disposed to form an angle of 90 ° with each other with the nozzle holder hole 4 as the center, and one of the two exhaust valves 2A and 2B and the two intake valves ( One of the lines 3A, 3B and the straight line connecting the nozzle holder hole 4 has a constant angle θ with respect to the center line 5 of the cylinder. Provides a four-valve type two-stroke internal combustion engine, it characterized in that the greater convenience.

Description

4-valve internal combustion engine optimizes engine performance

The present invention relates to a four-valve internal combustion engine, and more particularly, to an internal combustion engine in which four gang valves including two exhaust valves and two intake valves are arranged so that the engine can optimize performance.

In accordance with the government's strong environmental protection policy, regulations on the harmful constituents of exhaust gas for diesel two-stroke internal combustion engines are tightening day by day. Mixer distribution in the combustion chamber is an important factor that directly affects the efficiency of the engine and the component content of the exhaust, and therefore it is necessary to optimize such a mixer distribution.

In a conventional internal combustion engine, as shown in FIG. 1, only one exhaust valve 2 and one intake valve 3 are attached to the cylinder head 1. Such an exhaust valve 2 and an intake valve 3 are arranged inclined to one side of the cylinder head 1 about the nozzle holder hole 4 as shown in FIG. However, it was difficult to obtain a mixer distribution in the combustion chamber to obtain a combustion type that can optimize engine performance, that is, a mixer distribution evenly distributed in the combustion chamber centered before ignition at the start of combustion.

Therefore, a four-valve type in which four valves including two exhaust valves 2A and 2B and two intake valves 3A and 3B are disposed on the cylinder head 1 in recent years, while increasing the engine manufacturing cost. The engine is put into practical use. In four-stroke engines, the so-called overhead cam system in which such four valves are driven by two camshafts is common. In two-stroke engines, four-valve internal combustion engines in which four valves are driven by only one camshaft have been developed. .

In the four-valve internal combustion engine of the two-stroke engine as described above, one exhaust valve and one intake valve face each other, and the exhaust valves and the intake valves are disposed adjacent to each other, and the four valves are disposed at the center of the nozzle holder. They are arranged on the centerline of the cylinder and on a vertical line 90 ° with the centerline of such a cylinder to achieve degrees. By the way, the structure having four valves arranged on the center line of the cylinder head and on the vertical line perpendicular to the center line thus cannot obtain an optimum mixer distribution in the combustion chamber at the instant of ignition.

Therefore, the present invention is intended to provide a valve arrangement relationship that can achieve an optimum mixer distribution in the combustion chamber at the ignition start time in a four-valve two-stroke internal combustion engine including two exhaust valves and two intake valves.

1 is a bottom view showing the positions of an exhaust valve and an intake valve disposed on a cylinder head of a conventional internal combustion engine seen from the lower surface of a cylinder head,

FIG. 2 is a bottom view showing the positions of an exhaust valve and an intake valve disposed on the cylinder head of another conventional internal combustion engine seen from the lower surface of the cylinder head,

3 is a bottom view showing the positions of an exhaust valve and an intake valve disposed on the cylinder head of the internal combustion engine according to the present invention as seen from the bottom of the cylinder head.

* Description of the symbols for the main parts of the drawings *

1: Cylinder head 2, 2A, 2B: Exhaust valve

3, 3A, 3B: Intake valve 4: Nozzle holder hole

5: center line

Summary of the Invention

In order to solve the above technical problem, in the four-valve two-stroke internal combustion engine comprising two exhaust valves and two intake valves, one of the two exhaust valves and the two intake valves One of them is disposed to face each other, the two exhaust valves and the two intake valves are disposed adjacent to each other, the four valves are 90 degrees to each other centered on the nozzle holder hole And a straight line connecting one of the two exhaust valves, one of the two intake valves, and the nozzle holder hole is biased by a certain angle (θ) with respect to the center line of the cylinder. A valved two-stroke internal combustion engine is provided.

Description of the preferred embodiment of the invention

Referring now to the accompanying drawings, a preferred embodiment of a four-valve two-stroke internal combustion engine according to the present invention will be described in detail.

3 shows a bottom view showing the positions of the exhaust valve and the intake valve disposed on the cylinder head of the internal combustion engine according to the present invention as seen from the bottom of the cylinder head.

In Fig. 3, reference numeral 1 designates a cylinder head, 2A and 2B designate an exhaust valve, 3A and 3B designate an intake valve, 4 designates the nozzle holder, and 5 designates a centerline of the cylinder. .

The inventor of the present invention has continued research and experiments to optimize the distribution of the mixer in the combustion chamber at the start of ignition to improve the efficiency of the four-valve two-stroke internal combustion engine, and as a result, one of the two exhaust valves 2A or 2B and one of the two intake valves 3A, 3B are disposed to face each other, and the two exhaust valves 2A, 2B and the two intake valves 3A, 3B are The four valves 2A, 2B, 3A, and 3B are disposed adjacent to each other and are arranged at an angle of 90 ° to each other with the nozzle holder hole 4 as the center, and the two exhaust valves 2A and 2B. It has been found that the straight line connecting one of them with one of the two intake valves 3A, 3B and the nozzle holder hole 4 should be biased by a certain angle [theta] with respect to the centerline 5 of the cylinder.

The angle θ is different for each of the individual engines, but is preferably between about 15 ° to 25 °.

According to the simulation results of the performance of the four-valve two-stroke internal combustion engine disposed according to this embodiment, the nitrogen oxide content in the exhaust gas having a current government regulation value of 11.0 g / Kwh is only about 5.5 g / Kwh. The fuel consumption rate is 140g / Kwh · ps, which is about 153 to 160g / Kwh · ps, and can be significantly improved.

The embodiment described above is merely an example to help understand the present invention, and the present invention is not intended to be limited.

Those skilled in the art will appreciate that modifications, changes, or adjustments to the above embodiments can be made without departing from the spirit and spirit of the invention.

Therefore, the scope of the present invention will be limited only by the appended claims, which are intended to cover all modifications, changes or adjustments without departing from the scope of the present invention.

As described above, the four-valve two-stroke internal combustion engine can realize the optimal intake flow and the optimum combustion type, compared to the conventional two-valve two-stroke internal combustion engine or the four-valve four-stroke internal combustion engine. Performance can be achieved, conditions can be achieved in accordance with the constituent restrictions of exhaust gradually strengthened according to the government's environmental regulations, and economical operation can be achieved by improving fuel economy.

Claims (2)

In a four-valve two-stroke internal combustion engine comprising two exhaust valves 2A and 2B and two intake valves 3A and 3B, One of the two exhaust valves 2A and 2B and one of the two intake valves 3A and 3B are disposed to face each other, and the two exhaust valves 2A and 2B are separated from each other. The four intake valves 3A, 3B are arranged adjacent to each other, and the four valves 2A, 2B, 3A, 3B are arranged at an angle of 90 ° with each other with the nozzle holder hole 4 as the center. And a straight line connecting one of the two exhaust valves 2A and 2B to one of the two intake valves 3A and 3B and the nozzle holder hole 4 has a constant angle with respect to the center line 5 of the cylinder. A four-valve two-stroke internal combustion engine characterized in that it is as convenient as (θ). The method of claim 1, The angle θ is different for each of the individual engines, but is between about 10 ° to 30 °.