KR100899327B1 - Intake and exhaust divice of internal combustion engine - Google Patents

Abstract

The present invention relates to an intake and exhaust device of an internal combustion engine for improving the output of an internal combustion engine used as a power source for automobiles, aircraft, ships and various industrial machines.

In order for the internal combustion engine to operate, an intake apparatus comprising an intake pipe 11 and an intake valve 12 for sucking fresh air necessary for sufficiently burning fuel, an exhaust valve 22 for discharging exhaust gas to the outside, and As the exhaust device consisting of the exhaust pipe 21 is required,

In theory, the intake valve 12 should open and the exhaust valve 22 should close when the piston 31 is at the top dead center at the end of the exhaust stroke of the piston 31 and the intake stroke starts. To inhale air sufficiently and exhaust the exhaust gas sufficiently,

When the rotation angle of the internal combustion engine rotary shaft 51 is opened at the same time as the intake valve 12 is opened in advance at 15 ° before the top dead center of the piston 31, and the exhaust valve 22 is closed at 15 ° after the top dead center. In the time when the piston 31 reaches the top dead center from the top of the top dead center during the valve overlap time of the valve, the exhaust gas in the cylinder 41 is incorrectly escaped toward the intake pipe 11. Soot accumulates in the exhaust gas, and at a time from the top dead center to 15 °, a negative pressure is generated in the combustion chamber 43 due to the lowering of the piston 31 to exhaust the exhaust gas toward the combustion chamber 43. In order to prevent adverse effects that the output of the internal combustion engine is lowered due to the lack of new air supply due to the reverse flow,

In the present invention, an exhaust gas blocking valve 13 is provided in the passage of the intake pipe 11 behind the intake valve 12 to prevent the exhaust gas from escaping to the intake pipe 11. The output of the internal combustion engine is improved by providing an exhaust gas backflow attenuation valve 23 that attenuates the backflow amount of the exhaust gas in the passage of the exhaust pipe 21.

Intake Valve, Exhaust Valve, Exhaust Backflow Attenuation Valve, Exhaust Valve

Description

Intake and exhaust divice of internal combustion engine

The present invention relates to an intake and exhaust device of an internal combustion engine for improving the output of an internal combustion engine used as a power source for automobiles, aircraft, ships and various industrial machines.

In order for the internal combustion engine to operate, an intake apparatus comprising an intake pipe 11 and an intake valve 12 for sucking fresh air necessary for sufficiently burning fuel, an exhaust valve 22 for discharging exhaust gas to the outside, and As the exhaust device consisting of the exhaust pipe 21 is required,

In theory, the intake valve 12 should open and the exhaust valve 22 should close when the piston 31 is at the top dead center at the end of the exhaust stroke of the piston 31 and the intake stroke starts. To inhale air sufficiently and exhaust the exhaust gas sufficiently,

When the rotation angle of the internal combustion engine rotary shaft 51 is opened at the same time as the intake valve 12 is opened in advance at 15 ° before the top dead center of the piston 31, and the exhaust valve 22 is closed at 15 ° after the top dead center. In the case of the valve overlapping time, when the piston 31 reaches the top dead center from 15 ° before the top dead center, the exhaust gas in the cylinder 41 is incorrectly escaped toward the intake pipe 11, so that the intake pipe 11 Soot accumulates in the exhaust gas, and at a time from the top dead center to 15 °, a negative pressure is generated in the combustion chamber 43 due to the lowering of the piston 31 to exhaust the exhaust gas toward the combustion chamber 43. In order to prevent the adverse effect that the output of the internal combustion engine is lowered due to the lack of new air supply because of the reverse flow,

In the present invention, an exhaust gas blocking valve 13 is provided in the passage of the intake pipe 11 behind the intake valve 12 to prevent the exhaust gas from escaping to the intake pipe 11. The output of the internal combustion engine is improved by providing an exhaust gas backflow attenuation valve 23 that attenuates the backflow amount of the exhaust gas in the passage of the exhaust pipe 21.

The internal combustion engine according to the present invention has a piston for a mixed gas (mixer) in which air sucked through the intake valve 12 of the intake pipe 11 and fuel injected from the injector 42 at the upper portion of the cylinder 41 are mixed. The power is generated by four consecutive strokes of intake, compression, explosion and exhaust of (31).

In the conventional internal combustion engine, the rotation angle of the rotary shaft 51 is similar to that of the piston 31 in order to suck as much intake air as possible at the top dead center position of the piston 31 in which the intake stroke starts after the exhaust stroke is completed. Intake valve 12 is opened in advance at point 15 ° before,

In addition, in order to discharge as much exhaust gas as possible, the exhaust valve 22 is closed late at a position after the top dead center of the piston 31 by 15 °,

During the time when the two valves are opened and the piston 31 reaches the top dead center from 15 ° before the top dead center, the exhaust gas in the cylinder 41 is incorrectly escaped to the intake pipe 11. Therefore, soot accumulates in the intake pipe 11, and at a time from the top dead center to 15 °, negative pressure is generated in the combustion chamber 43 due to the lowering of the piston 31, and the exhaust gas discharged is discharged. Since the flow back to the combustion chamber 43, a serious problem of lowering the output of the internal combustion engine has been caused by the lack of a new air supply amount to solve this phenomenon.

In the present invention, the exhaust gas to flow back to the exhaust pipe 21 during the time when the opening of the two intake and exhaust valves 12 and 22 at the top dead center position of the piston 31 where the exhaust stroke ends and the intake stroke starts. An exhaust gas backflow attenuation valve 23 that attenuates the amount of gas in the passage of the exhaust pipe 21,

In addition, the output of the internal combustion engine is improved by installing an exhaust gas check valve 13 on the intake pipe 11 that prevents the flow of the exhaust gas which is incorrectly escaped to the intake pipe 11.

15 degrees before and after the top dead center of the piston 31 at the end of the exhaust stroke after the exhaust stroke is completed, the angle of the rotation shaft 51 of the four strokes of the intake, compression, explosion and exhaust of the piston 31 in the internal combustion engine } In the combustion chamber 43 due to the lowering after the top dead center of the exhaust gas and the piston 31 which are incorrectly escaped to the intake pipe 11 during the time when the opening of the intake / exhaust valves 12 and 22 overlaps. To reduce the amount of exhaust gas flowing back from the exhaust pipe 21 into the combustion chamber 43 due to the negative pressure.

An exhaust gas check valve 13 is installed in the intake pipe 11, and an exhaust gas backflow attenuation valve 23 is installed in the exhaust pipe 21.

Intake air that protrudes on the outer circumferential surface of the exhaust gas check valve 13 so that new air that starts to be sucked through the passage of the intake pipe 11 can be sucked and exhaust gas exhausted through the exhaust pipe 21 can be exhausted. Attach the guide blades (14) to form an arc-shaped intake groove (15),

In addition, an arc-induced exhaust groove 25 is formed by attaching an exhaust guide blade 24 protruding to the outer circumferential surface of the exhaust gas backflow attenuation valve 23.

At the moment when the opening of the intake / exhaust valves 12 and 22 where the intake stroke starts after the exhaust stroke is overlapped, the exhaust gas is smoothed and the intake of new air is smoothed, thereby improving the output of the internal combustion engine.

The present invention is to improve the output by improving the combustion efficiency of the internal combustion engine,

In the intake and exhaust device of an internal combustion engine,

When the position of the piston 31 of the internal combustion engine is in the range to start the intake stroke as the exhaust stroke ends,

Opening of the intake valve 12 and the exhaust valve 22 corresponds to the time when the overlap (Overlap),

Only during the time when the rotation angle of the rotation shaft 51 is in the range of 15 ° before the top dead center to 15 ° after the top dead center, based on the top dead center of the piston 31,

The exhaust gas blocking valve 13 inserted into the intake pipe 11 and retracted by the elastic force of the intake spring 17 sucks new air into the arc-shaped intake groove 15 formed by the intake guide vane 14. By advancing toward the combustion chamber 43 by the exhaust gas stopping cam 16, the exhaust gas is prevented from erroneously escaping toward the intake pipe 11,

The exhaust gas backflow attenuation valve 23 inserted into the exhaust pipe 21 and retracted by the elastic force of the exhaust spring 27 exhausts the exhaust gas into the arc-shaped exhaust groove 25 formed by the exhaust induction blade 24. It is advanced to the combustion chamber 43 by the exhaust gas backflow attenuation cam 26

By narrowing the space of the exhaust pipe 21, an intake and exhaust device of the internal combustion engine is configured to attenuate the amount of exhaust gas flowing back from the exhaust pipe 21 toward the combustion chamber 43.

An intake and exhaust device of the internal combustion engine of the present invention is a moment when the intake stroke is to be started as the exhaust stroke of the four strokes of the suction, compression, explosion, exhaust of the piston 31,

The rotation angle of the rotating shaft 51 corresponding to the time when the opening of the intake valve 12 and the exhaust valve 22 overlaps is 15 ° before the top dead center and 15 ° after the top dead center, based on the top dead center of the piston 31. Only for the time period in the range of

The exhaust gas blocking valve 13 provided in the intake pipe 11 prevents the exhaust gas from escaping to the intake pipe 11,

The exhaust gas backflow attenuation valve 23 installed in the exhaust pipe 21 attenuates the amount of exhaust gas to be flowed back to the exhaust pipe 21,

In the mixing of fuel and air in the combustion chamber 43, the combustion efficiency is improved by the mixed gas (mixer) in which the oxygen content is increased by the smooth supply of fresh air, so that the output of the internal combustion engine can be obtained.

The detailed configuration of the present invention through the accompanying drawings as follows.

First, Figure 1 is a longitudinal cross-sectional view of the intake and exhaust device of the internal combustion engine of the present invention, the state of the figure is the intake stroke starts from the end of the exhaust stroke of the four strokes of the intake, compression, explosion, exhaust of the piston 31. As the piston 31 is located at the top dead center,

In this case, theoretically, the intake valve 12 should be opened and the exhaust valve 22 should be closed, but in practice, the rotation angle of the rotary shaft 51 is the top dead center of the piston 31 in order to sufficiently suck the intake air and exhaust the exhaust gas sufficiently. Intake valve 12 is opened in advance when it reaches 15 ° before top dead center on the basis of

Since the exhaust valve 22 is closed only late at 15 ° after the top dead center, the exhaust gas exhausted from the cylinder 41 is discharged at a time when the open state when the intake and exhaust valves 12 and 22 are open at the same time overlaps. Is incorrectly escaped to the intake pipe 11,

In addition, a phenomenon in which the exhaust gas exhausted toward the exhaust pipe 21 flows back into the combustion chamber 43 occurs, and the mixed gas in which the fuel injected from the injector 42 and the new air sucked from the intake pipe 11 is smoothly mixed. In order to solve this problem, since the combustion efficiency is lowered due to the failure of the mixer, a serious problem occurs that the output of the internal combustion engine is lowered.

In the present invention, only during the time when the opening of the intake and exhaust valves 12 and 22 overlaps,

The exhaust gas reducing valve 13 provided in the passage of the intake pipe 11 behind the intake valve 12 is advanced toward the combustion chamber 43 by the pushing operation of the exhaust gas stopping cam 16, and the intake pipe 11 is By narrowing the space of the part, some of the exhaust gas which tries to escape wrongly toward the intake pipe 11 is prevented. However, it is unavoidable that the remaining exhaust gas which cannot be prevented can escape through the arc-shaped intake groove 15 formed by the intake guide vane 14 formed on the outer circumferential surface of the exhaust gas blocking valve 13. That is, the exhaust gas stop valve 13, which is one of the features of the present invention, can prevent most of the exhaust gas from incorrectly escaping into the intake pipe 11, but most of the exhaust gas incorrectly escapes into the intake pipe 11. It has the advantage of being able to stop the gas.

At the same time, the new air at which suction is started is sucked into the combustion chamber 43 through the arc-shaped intake groove 15.

In addition, the exhaust gas backflow attenuation valve 23 provided in the passage of the exhaust pipe 21 behind the exhaust valve 22 is advanced toward the combustion chamber 43 by the pushing operation of the exhaust gas backflow damping cam 26 to exhaust the exhaust pipe 22. By narrowing the space in (21), the amount of exhaust gas flowing back from the exhaust pipe 21 toward the combustion chamber 43 is attenuated. However, it is inevitable that some of the exhaust gas that is not attenuated escapes through the arc-shaped exhaust groove 25 formed by the exhaust induction blade 24 formed on the outer circumferential surface of the exhaust gas backflow damping valve 23. That is, the exhaust gas backflow attenuation valve 23, which is one of the features of the present invention, has an advantage in that it can attenuate some exhaust gas, although it cannot prevent all the exhaust gas flowing back toward the combustion chamber 43.

At the same time, the exhaust gas that has been discharged is exhausted to the outside through the arc-shaped exhaust groove 25.

Accordingly, a mixture gas (mixer) in which the fuel injected from the injector 42 and the new air sucked through the arc-shaped intake groove 15 of the exhaust gas check valve 13 is mixed in the combustion chamber is improved in combustion efficiency. As a result, the output of the internal combustion engine can be improved.

In addition, the exhaust gas check valve 13 and the exhaust gas backflow attenuation valve 23, which were advanced toward the combustion chamber 43 as described above, during the time when the openings of the intake and exhaust valves 12 and 22 are overlapped, the overlap time When the exhaust gas stop cam 16 and the exhaust gas backflow attenuation cam 26 are terminated, the pushing operation is released to return back to the original position by the elastic force of the intake spring 17 and the exhaust spring 27, respectively. Is self explanatory,

When the piston 31 is located at the top dead center and the bottom dead center except for the case where the suction stroke is started after the exhaust stroke is completed, the reverse flow phenomenon of the exhaust gas and the erroneous escape of the exhaust gas do not occur. 13) and the forward operation to the combustion chamber 43 of the exhaust gas backflow damping valve 23 is not necessary.

Reference numeral 18 that is not described in this description is an intake valve spring, 19 is an intake valve cam, 28 is an exhaust valve spring, 29 is an exhaust valve cam, 32 is a piston rod.

As described above, with reference to the preferred embodiment of the present invention, those skilled in the art will be variously modified and modified within the scope of the present invention without departing from the spirit and scope of the present invention described in the claims below. It will be appreciated that it can be changed.

1 is a longitudinal sectional view of an intake and exhaust device of an internal combustion engine of the present invention;

<Code Description of Main Parts of Drawing>

11: intake pipe

12: intake valve

13: Exhaust gas check valve

14: Intake wing

15: arc intake groove

16: Exhaust gas cam

17: intake spring

18: Intake valve spring

19: Intake valve cam

21: exhaust pipe

22: exhaust valve

23: exhaust gas backflow check valve

24: exhaust induction wing

25: arc exhaust groove

26: exhaust gas backflow attenuation cam

27: exhaust spring

23: exhaust valve spring

29: exhaust valve cam

31: piston

32: piston rod

41: cylinder

42: injector

43: combustion chamber

51: axis of rotation

Claims (1)

In the intake and exhaust device of an internal combustion engine, When the position of the piston 31 of the internal combustion engine is in the range to start the intake stroke as the exhaust stroke ends, Opening of the intake valve 12 and the exhaust valve 22 corresponds to the time when the overlap (Overlap), Only during the time when the rotation angle of the rotation shaft 51 is in the range of 15 ° before the top dead center to 15 ° after the top dead center, based on the top dead center of the piston 31, The exhaust gas blocking valve 13 inserted into the intake pipe 11 and retracted by the elastic force of the intake spring 17 sucks new air into the arc-shaped intake groove 15 formed by the intake guide vane 14. By advancing toward the combustion chamber 43 by the exhaust gas stopping cam 16, the exhaust gas is prevented from erroneously escaping toward the intake pipe 11, The exhaust gas backflow attenuation valve 23 inserted into the exhaust pipe 21 and retracted by the elastic force of the exhaust spring 27 exhausts the exhaust gas into the arc-shaped exhaust groove 25 formed by the exhaust induction blade 24. It is advanced to the combustion chamber 43 by the exhaust gas backflow attenuation cam 26 An intake and exhaust device of an internal combustion engine, characterized in that for reducing the amount of exhaust gas flowing back from the exhaust pipe (21) toward the combustion chamber (43) by narrowing the space of the exhaust pipe (21).

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