A four-stroke internal combustion engine with multiple cylinders in a single combustion chamber.

Abstract

The bore is reduced while the stroke is not lengthened to maintain the required displacement. [Solution] If we consider a square combustion chamber with a displacement of approximately 500cc, a bore and stroke of 54mm x 54mm x 4 pistons results in a very small bore and stroke of 494.6cc, compared to a normal single-piston engine with a bore and stroke of 85.72mm x 85.72mm and a displacement of 494.6cc. With an area ratio of 2.52 to 1 compared to a normal single-piston engine, the 4 pistons will experience more than 2.5 times the combustion pressure if the compression ratio is the same. If a normal single-piston 3-cylinder 1484cc engine produces 100 horsepower, then a 4-piston engine would theoretically produce 250 horsepower. And all this with the fuel efficiency of a naturally aspirated 1.5L engine. Although there are considerable mechanical losses due to the movement of four pistons and two crankshafts, the resulting increase in power more than compensates for these losses.

Description

Technical Field

[0001] The present invention is a technology for increasing the rotational force of a four-cycle internal combustion engine.

Background Art

[0002] In a conventional one-piston-per-one-combustion-chamber, it is difficult to generate torque because the combustion pressure is received with a wide bore.

Disclosure of the Invention

Problems to be Solved by the Invention

[0003] The problem to be solved is to ensure the displacement without shortening the stroke while reducing the bore.

[0004] It has the property of pushing with the same force in the vertical direction with respect to the orientations of all the wall surfaces forming the sealed container, which is one of the behaviors of the pressure fluid in the sealed container.

[0005] For the counter pistons, which are said to be highly efficient, the center of the cylinder is cut in a checkerboard pattern, and the tops of the cylinders divided into left and right are connected at an angle in an inverted V shape.

[0006] By closing and sealing the resulting gap with a wall surface, the pistons do not oppose each other, but since two pistons are pushed with the same force by one combustion, it becomes the same as the counter pistons. An intake / exhaust port is provided in the newly provided wall surface, and an opening / closing structure for the intake / exhaust valve can be installed.

[0007] The characteristic of the counter pistons is a long stroke, and the bore is small for the displacement. The stroke of one piston is within the range of common sense, but the combined strokes of two pistons enable the displacement to be achieved even with a small bore.

[0008] In another behavior of the pressure fluid in the sealed container, the smaller the area of the surface being pushed with the same force, the more strongly it is pushed as a result. Therefore, for the same displacement, a smaller bore is better.

[0009] The reason why internal combustion engines with a long stroke are torquey is due to this property: if the displacement and compression ratio are the same, reducing the bore area by 10% will result in the piston being pushed with 10% more force.

[0010] Torque increases when the piston is pushed with greater force, but if the stroke is too long, the rotation speed cannot be increased mechanically. Opposing pistons have a small bore and a short stroke, so they are torquey and can increase rotation speed.

[0011] This method utilizes this characteristic by connecting the tops of cylinders tilted at a 15-degree inverted V-shape, then connecting another pair of the same, and arranging four pistons in a single combustion chamber.

[0012] The cylinder head seals the gaps between the four cylinders, which are angled at 165 degrees, and features a cross-flow design with the intake valve in the center and the exhaust valves in a row at the front and back. A single camshaft directly actsuates the three vertically positioned valves. Because the area below the cylinder head is more complex than conventional designs, the cylinder head itself is simplified without compromising performance.

[0013] The spark plugs cannot be placed in the center, but this can be managed by using multiple spark plugs to avoid the intake and exhaust ports, or by placing them in the center, although this will make maintenance more difficult. In this case, the spark plugs are inserted from below into the space where the four cylinders meet.

[0014] The reason for prioritizing the central placement of the intake valve is to ensure uniform intake air distribution to all four cylinders and to create a unidirectional tumble flow in each cylinder. This method can be achieved without any modifications to the intake ports or valves. [Brief explanation of the drawing]

[0015] [Figure 1] This is a side view of an example of a four-stroke internal combustion engine according to the present invention.

Claims

1. A four-stroke internal combustion engine in which two or more cylinders are connected at the top of each other in an inverted V-shape, and two or more identical units are connected, with four or more cylinders sharing a single combustion chamber.

2. A four-stroke internal combustion engine in which two or more cylinders are vertically connected, two or more identical units are connected, and four or more cylinders share a single combustion chamber.

3. A four-stroke internal combustion engine that places the intake port in the center and the exhaust ports in a straight line at the front and back, allowing a single camshaft to directly operate the vertically positioned intake and exhaust valves.

4. Because the intake valve is in the center, the spark plug cannot be placed in the center. However, in a four-stroke internal combustion engine, the spark plug is inserted from below into the gap between the four or more connected cylinders to secure its central position.

5. A four-stroke internal combustion engine having a partition wall between the cylinder head and the cylinder, with multiple holes drilled through the partition wall, and protrusions on the piston head positioned and shaped to fit into these multiple holes.

6. A Wankel-type internal combustion engine in which the rotor thickness is reduced, multiple thin rotors are placed in a single rotor housing, and thin partitions are provided between each rotor. During the exhaust and intake strokes, the partitions between each rotor are open, and during the compression, combustion, and expansion strokes, each rotor is isolated by the partitions.

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