KR20020008555A - Engine - Google Patents

Abstract

PURPOSE: An engine using compressed air as a power medium is provided to improve the air compression efficiency by improving the shape of an exhaust cam and properly controlling the opening time of an exhaust valve. CONSTITUTION: A pneumatic engine uses a secondary battery(B) as a power supply. A motor(36) is electrically connected to the secondary battery. The motor is connected with a compressor(34) via a belt. By driving the compressor, compressed air is generated. The compressor is connected through a pipeline(42) of an engine body(32), and the compressed air is supplied into a cylinder. Upon suction of the high pressure compressed air, a piston lifts up and down. Then, an exhaust valve is opened and air is discharged to the atmosphere. One time explosive power is obtained while a crankshaft(10) rotates one time. Therefore, the action of an 8-cylinder engine is obtained by a 4-cylinder engine.

Description

Engines using compressed air as a power medium {ENGINE}

The present invention relates to a pneumatic engine, and more particularly to a pneumatic engine that can improve the output of the engine by improving the exhaust efficiency by improving the shape and mounting position of the exhaust cam.

In general, the engine has a power source that uses an internal combustion engine and electricity. Since the internal combustion engine obtains the power required to drive the engine by burning gasoline or diesel to obtain explosive power, air pollution caused by exhaust gas and exhaust gas is consumed. The problem is becoming a social problem.

By the way, the power source using the electricity can solve the problems of the internal combustion engine, while it is difficult to obtain a high power, it has not reached the practical stage.

Therefore, research on engines using pneumatics as a new power source is actively being conducted.

Such pneumatic engines are disclosed in patent 103915, filed March 4, 1993, filed by Applicant under the name "Engine Compressed Air as a Power Medium".

In the pneumatic engine according to the present invention, the motor is driven by the power of the battery, and the driving force drives the compressor to generate compressed air, which is sucked into the cylinder to push the piston to rotate the crankshaft.

Simultaneously with this action, as the camshaft rotates, the camshaft rotates to open and close the intake / exhaust valve to smoothly inhale and discharge the compressed air. At this time, the intake cam and the exhaust cam of the camshaft open and close the intake and exhaust valves mounted on the respective cylinders once the crankshaft is completed.

Thus, the four-cylinder engine does what the eight-cylinder engine does, which in turn acts to rotate the crankshaft, thus increasing the power required to drive the car.

However, the exhaust cam mounted on the pneumatic engine is a circular plate, and both sides of the circular plate are cut parallel to each other. Therefore, when the exhaust cam having the above shape is driven, the exhaust valve is opened early, thereby deteriorating the compression efficiency of air.

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a pneumatic engine capable of improving the compression efficiency of air by appropriately adjusting the opening time of the exhaust valve by improving the shape of the exhaust cam. To provide.

1 is a partial cutaway perspective view showing only the body of a pneumatic engine according to a preferred embodiment of the present invention.

2 is a schematic view showing the structure of a pneumatic engine according to a preferred embodiment of the present invention.

3 is a perspective view showing a crankshaft mounted to the pneumatic engine shown in FIG.

4 is a front view showing a camshaft mounted to the pneumatic four-stroke engine shown in FIG.

5 (a) to (d) are front views showing the positional relationship of the plurality of intake cams shown in FIG.

6 (a) to (d) are front views showing the positional relationship of the plurality of exhaust cams shown in FIG.

7 is a front view showing a camshaft mounted to a pneumatic three-stroke engine according to a preferred embodiment of the present invention.

8 (a) to (d) are front views showing the positional relationship of the plurality of intake cams shown in FIG.

9 (a) to 9 (d) are front views showing the positional relationship of the plurality of exhaust cams shown in FIG.

Hereinafter, with reference to the accompanying drawings will be described in detail a pneumatic engine according to an embodiment of the present invention.

1 is a partial cutaway perspective view showing only a main body of a pneumatic engine according to a preferred embodiment of the present invention, Figure 2 is a schematic diagram showing the structure of a pneumatic engine according to a preferred embodiment of the present invention.

As shown, the cylinder block 2 has a block structure in which four or more cylinders 6 are integrally cast.

The lower portion of the cylinder block (2) is equipped with an oil pan (4) for accommodating oil for lubrication of each friction portion of the engine.

A plurality of cylinders 6 formed inside the cylinder block 2 are installed in a state in which a piston 8 can reciprocate up and down, respectively, and the pistons 8 have a crank shaft 10 and a connecting rod. It is connected to (12) to convert the linear movement of the piston (8) to the rotational movement of the crankshaft (10).

In addition, a cylinder head 14 is coupled to an upper portion of the cylinder 6, and a rocker arm shaft 18 to which a plurality of rocker arms 16 are connected is installed at the cylinder head 14.

The rocker arms 16 are in contact with the upper end of the stem of the intake and exhaust valve 20 to open and close the valve.

The crankshaft 10 is connected to the camshaft 24 provided with the intake and exhaust cams 22 for operating the rocker arm 16 and the timing belt 26 so that the crankshaft 10 can be electrically driven. The timing gear provided in the inner side has a number of teeth having a rotation ratio of 1: 2 so that the cam shaft 24 rotates once when the crankshaft 10 rotates two times.

As shown in FIG. 2, a pneumatic engine according to a preferred embodiment of the present invention uses a secondary battery B as a power source, and an electric motor 36 is electrically connected to the secondary battery B to be driven. . The electric motor 36 is connected to the compressor 34 by a belt to drive the compressor 34 to generate compressed air. The compressor 34 is connected through the conduit 42 of the engine body 32 to supply the compressed air into the cylinder 6.

The conduit 42 is provided with a device capable of adding or subtracting the amount of compressed air generated in the compressor 34 when the compressed air generated in the compressor 34 flows into the cylinder 6 by interlocking with the accelerator pedal of the engine.

The air that started the engine is a structure that can be discharged to the atmosphere through the conduit 48 of the exhaust manifold of the engine main body (32).

3 is a perspective view showing a crankshaft mounted to the pneumatic engine shown in FIG.

As shown, the crank pins 50, 52, 54, 56 of the crankshaft 10 are arranged in a 90 ° direction to each other. That is, the crank pin 50 to which the piston of cylinder 1 is connected, the crank pin 54 to which the piston of cylinder 3 is connected, and the crank pin 56 to which the piston of cylinder 4 is connected, and the piston of cylinder 2 are The crank pins 52 which are connected form an angle of 90 ° to each other in a clockwise direction.

The crankshaft 10 has a balance weight and shaft journal in the same or similar shape as the conventional one.

4 is a front view showing a camshaft mounted to the pneumatic four-stroke engine shown in FIG.

The camshaft 24 is spaced at regular intervals, and the intake cams 62, 64, 66, 68 and the exhaust cams 70, 72, 74, 76 are positioned in two sets.

The intake cams 62, 64, 66 and 68 each have two lobes, which protrude in a symmetrical direction from each other. Thus, the number of lobes of the intake cams 62, 64, 66, 68 is eight, which are arranged at 45 degrees each.

That is, as shown in FIG. 5, when the intake cam 62 associated with cylinder 1 is positioned up and down in the drawing, the lobe of the intake cam 62 associated with cylinder 3 is the intake cam. At an angle of inclination of 45 degrees from the lobe position of, and the lobe of the intake cam 68 associated with cylinder 4 is positioned at an angle of inclination again 45 degrees from the position of the intake cam 66 associated with cylinder 3, The lobe of the intake cam 64 relative to cylinder 2 is at a position inclined 45 degrees from the position of the intake cam 68 relative to cylinder 4.

The exhaust cams are as shown in FIG.

Exhaust cams of this structure are arranged in an inclined position by 45 in order relative to the first, third, fourth and second cylinders.

In the engine of the present invention thus constructed, first, the electric motor 36 is driven by the power supply of the secondary battery B, and the compressor 34 is operated to generate compressed air.

At this time, as the pressure of the compressed air generated by the compressor 34 is increased, the compressed air is introduced into the cylinder 6 through the conduit 42.

The intake valve must be open to allow compressed air to flow into the cylinder (6). For four-cylinder engines, one piston has a top dead center, the other one has a bottom dead center, and the other two pistons have a top dead center. Since it is located between and the bottom dead center, respectively, the intake action can be made in the cylinder (6) provided with a piston located in the top dead center.

For convenience of explanation, if the piston of cylinder 1 is located at the top dead center, the explosive sequence in the four-stroke engine is made in the order of cylinders 1, 3, 4, 2, so compressed air flows into cylinder 1 Will be.

At this time, the crank pins (50, 52, 54, 56) of the crank shaft 10 is located at 12 o'clock, as shown in Figure 3, the intake cam 62 of the cam shaft 24 is the rocker arm By pushing, the intake valve is opened, and the other crank pins 50, 52, 54, and 56 are positioned in the 90 degree directions, respectively.

7 is a table showing the working relationship when the crank pins (50, 52, 54, 56) of the crankshaft 10 is in the above position, respectively, where the piston connected to the crank pin associated with the cylinder 1 is lowered When the suction starts, the piston connected to the crank pin 54 related to cylinder 3 corresponds to the end of the exhaust, and the piston connected to the crank pin 56 related to cylinder 4 corresponds to the stroke of the exhaust. And, the piston connected to the crank pin 52 associated with the second cylinder corresponds to the stroke of the exhaust initial stage, respectively.

At this time, the piston related to the first cylinder, the crankshaft 10 is rotated 180 degrees completely down to the bottom dead center, the intake stroke is completed, and when the crankshaft 10 starts to rotate 180 degrees again, the piston is raised again, exhaust Administration takes place.

This operation is repeated in all the cylinders, the engine according to the present invention when the crankshaft completes the rotation of 720 degrees cam shaft 24 is rotated 360 degrees while opening and closing the intake and exhaust valves twice.

In the series of operations described above, the intake stroke and the exhaust stroke are performed in one, three, four, and two cylinders as shown in the table of FIG. 7, resulting in one explosion stroke per one revolution of the crankshaft 10.

This can be realized by the camshaft according to the present invention, which describes the operating state of the camshaft.

The intake cam 62 associated with the intake valve of cylinder 1 described above has a position as shown in FIG. 5A in the intake stroke.

And the intake cam 66 related to the 3rd cylinder is located as shown in FIG. 5 (B), and the intake cam 68 related to the 4th cylinder is shown in FIG. 5 (C), The intake cam 64 associated with the second cylinder is in the position as shown in FIG. 5 (D).

The table shown in FIG. 4 is for explaining the working relationship of the intake and exhaust cams 62... 76 opening and closing the intake and exhaust valves, and the intake cam 62 associated with the first cylinder is shown in FIG. As shown in FIG. 1, the intake valve is in an open state. In the state in which the lobe's most advanced protrusion is in contact with the rocker arm, the intake middle stroke is performed. When the camshaft 24 rotates 22.5 °, the intake stroke is compressed. The cylinder flow of air is completed.

At this time, the piston is lowered by the incoming compressed air while rotating the crankshaft 10, the lowering of the piston is made twice while the cam shaft 24 is rotated one time and two synergism is made.

That is, the intake cams of the camshaft 24 are opened by an angle of 45 ° and closed by an angle of 135 ° so that the camshaft 24 is opened and closed twice each during the rotation of the camshaft 24.

In addition, the camshaft rotation of the three-stroke exhaust cams 90, 92, and 94 is performed at an angle of 60 °, and the intake cams 80, 82, and 84 are sequentially opened, and are closed while forming a camshaft of about 18 °. It works.

The intake cam is of FIG. 8 and the exhaust cam is of FIG.

On the other hand, the four-stroke exhaust cam (70, 72, 74, 76) is rotated camshaft at an angle of 45 °, cam shaft rotation of about 11 ° after the intake cams (62, 64, 66, 68) are opened sequentially It is made close.

Therefore, in one cylinder 6, the high pressure compressed air is sucked in, and the piston descends and rises, and the exhaust valve is opened to be discharged into the atmosphere. One explosion power is gained during each revolution.

Therefore, in the engine according to the present invention, the conventional internal combustion engine can obtain one explosion power in two revolutions of the crankshaft, whereas the conventional four-cylinder engine can obtain eight explosions in one revolution of the crankshaft. Can work like an organ.

As described above, the engine according to the present invention can obtain one operating power for one revolution of the crankshaft, thereby minimizing the pulsation of the engine and increasing the output of the engine. can do.

In addition, since the engine according to the present invention does not use fuel, it can be considerably economical in terms of fuel saving, and can completely solve the air pollution problem caused by the harmful substances in the exhaust gas generated by combustion of the fuel.

In addition, since the pneumatic engine does not generate heat, it does not require a cooling means and does not need to add a means such as a catalytic converter for purifying harmful substances. Therefore, there is a structural advantage to simplify the structure of the entire engine. In addition, the use of secondary batteries improves the power supply efficiency. In addition, there is an advantage of improving the exhaust efficiency by improving the shape of the exhaust cam.

Claims (6)

An electric motor driven by a secondary battery, compressed air generating means for sucking and compressing the atmosphere by receiving the driving force of the electric motor, an intake manifold connected to the outlet side of the compressed air generating means, and the intake manifold described above A cylinder block comprising a cylinder interlocked with the crank shaft, a crank shaft connected by a connecting rod to convert a linear movement of a piston movably located inside the cylinder into a rotational movement, and the crank shaft and the belt. Or a camshaft for opening and closing the intake and exhaust valves by chain driving. The crankshaft of claim 1, wherein the crankshaft has a crank pin connected to a piston of cylinder 1, a crank pin connected to a crank pin of cylinder 3, a crank pin of cylinder 4, and a crank connected to a piston of cylinder 2. Pneumatic engine, characterized in that the angle of the pin is sequentially arranged at an angle of 90 °. The pneumatic engine according to claim 1, wherein the camshaft comprises an intake cam each having a lobe formed in the symmetrical direction, and an exhaust cam having an opening for opening the exhaust valve in the symmetrical direction. The pneumatic engine according to claim 1, wherein one compressed air is sucked in one revolution of the crankshaft to act as an explosion stroke. The odd stroke pneumatic engine of claim 1, wherein the exhaust cams are at an angle of about 60 ° and the intake cams are rotated at an angle of about 18 °. The even stroke pneumatic engine of claim 1, wherein the exhaust cams are at an angle of about 45 ° and the intake cams are rotated at an angle of about 11 °.