JPS6149130A - 4-cycle internal-combustion engine - Google Patents

Abstract

PURPOSE:To raise booster pressure and improve the output of an engine by providing a mixture reserving chamber for once reserving mixture subjected to primary compression in a crank chamber between the crank chamber and an intake valve. CONSTITUTION:When a piston 21 ascends in the compression stroke mixture from a carbureter 13 enters a crank chamber 22. In the expansion stroke, the piston 21 descends, a lead valve 15 is closed and a lead valve 24 is opened to introduce the mixture into a mixture reserving chamber 25. In the exhaust stroke, the lead valve 24 is closed to enclose mixture subjected to primary compressure in the crank chamber 22 within said chamber 25 so that the lead valve 15 is opened to send the mixture to the crank chamber 22. In the intake stroke, as an intake valve 17 is opened, the mixture is introduced from said chamber 25 into a cylinder 20. When the piston 21 further descends, the mixture in the crank chamber 22 is transferred to said chamber 25 and introduced into the cylinder 20 while the intake valve 17 is opened.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the structure of a four-stroke internal combustion engine, and in particular, the engine output is increased as a whole by increasing boost pressure by utilizing pressure changes in the crank chamber. It relates to a four-stroke internal combustion engine.

[Prior art]

FIG. 6 shows the configuration of a conventional four-stroke gasoline internal combustion engine. In the figure, 1 is an intake valve, 2 is an exhaust valve, 3 is a spark plug, 4 is a cylinder, 5 is a piston, 6a
7 is a connecting rod connecting the piston 5 and the crankshaft 6b, 7 is a crank chamber, and 8 is a blow-by gas reduction device.

When the piston 5 moves from top dead center to bottom dead center during the intake stroke in FIG. inhale. Immediately after the piston 5 reaches the bottom dead center, the intake valve 1 does not close completely, and a small amount of air is taken in due to the inertia of the air-fuel mixture flow, and after a time delay, the intake valve 1 closes and the intake ends. Moving to the compression stroke in Fig. 8, the intake valve 1 and the exhaust valve 2
are closed together, and the air-fuel mixture in the cylinder is compressed as the piston 5 moves from the bottom dead center side to the top dead center side. At this time, the air-fuel mixture from the carburetor flows completely through intake valve 1! ll is blocked.

By igniting the compressed air-fuel mixture using the ignition plug 3 just before the piston 5 reaches the top dead center, the engine moves to the expansion stroke shown in FIG. 9.

In the expansion stroke shown in FIG. 9, both the intake valve 1 and the exhaust valve 2 are closed, and the pressure caused by the explosion of the ignited air-fuel mixture moves the piston 5 from the top dead center toward the bottom dead center. At this time, since the intake valve 1 is closed, the flow of the air-fuel mixture from the carburetor is blocked. Further, at this time, unburned blow-by gas enters the crank chamber 7 through the gap between the piston 5 and the cylinder 4.

Proceeding further to the exhaust process shown in FIG. 10, the intake valve 1
remains closed, the exhaust valve 2 opens, and the piston 5 moves from the bottom dead center to the top dead center, thereby performing exhaustion. Since the intake valve 1 is closed, the flow of air-fuel mixture from the carburetor is blocked.

[Problem 3 to be solved by the invention As is clear from the above operation, 4
Cycle gasoline internal combustion engines use negative pressure for intake, so the boost pressure is negative. or.

A blowby gas reduction device 8 was required to burn blowby gas, which is one of the causes of air pollution.

Furthermore, since the air-fuel mixture is taken in from the carburetor only during the intake stroke of the four cycles, the efficiency of using the carburetor was poor.

The present invention provides a four-stroke internal combustion engine that improves output by increasing the boost pressure by increasing the primary pressure of the air-fuel mixture in the crank chamber, and also processes blow-by gas. .

[Failure to solve the problem]

The present invention includes intake and exhaust valves 17 and 18 in the cylinder 20,
In a 4-cycle internal combustion engine in which the air-fuel mixture is exploded once in the cylinder 20 by two revolutions of the crankshaft 16b, the carburetor 13 that mixes fuel and lubricating oil is connected to the crank chamber 2.
2 via an on-off valve 15, and the inlet side of a mixture reservoir chamber 25, which temporarily stores the air-fuel mixture etc. that has been primarily compressed in the crank chamber 22, is connected to the crank chamber 22 via an on-off valve 24, and further This is a four-stroke internal combustion engine characterized in that the outlet side of the mixture reservoir chamber 25 is connected to the cylinder 20 via an intake valve 17.

[Effect]

The present invention is based on the principle of primary compression of the air-fuel mixture in the crank chamber used in two-stroke gasoline internal combustion engines, and increases boost pressure by applying it to four-stroke gasoline internal combustion engines.

〔Example〕

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

FIG. 1 shows a four-stroke internal combustion engine using a reed pulp system to which the present invention is applied.

In the figure, the four-stroke internal combustion engine according to the present invention includes intake and exhaust valves 17 and 18' in the cylinder 20, and a crankshaft 16.
In a four-cycle internal combustion engine in which the air-fuel mixture is exploded once in the cylinder 20 with two rotations of b, a carburetor 13 that vaporizes fuel and lubricating oil is connected to a crank chamber 22 with a lead pulp (open, close valve) 15. At the same time, the inlet side of a mixture reservoir chamber 25, which temporarily stores the air-fuel mixture etc. that has been primarily compressed in the crank chamber 22, is connected to the crank chamber 22 through a reed pulp (on-off valve) 24, and further Mixture reservoir chamber 2
5 is connected to the cylinder 20 via an intake valve 17.

Note that materials other than the reed pulps 15 and 24 may be used as the on-off valves. In the figure, 11 is a lubricating oil pipe, 12 is a fuel pipe, and a carburetor 13 is a fuel pipe 1.
Fuel and lubricating oil pipes from 2 create a mixture of lubricating oil and air from 11. 14 is a pipe that leads the mixture from the carburetor 13 to the crank chamber 22. 16a connects the piston 21 and the crankshaft 16b. Conrod, 19. is a spark plug. 23 is a pipe that guides the air-fuel mixture that is primarily compressed in the crank chamber 22 to the air-fuel mixture reservoir chamber 25, 26 is a pipe that leads the air-fuel mixture from the air-fuel mixture reservoir chamber 25 to the cylinder, and 27 is an exhaust pipe.Next, the present invention The operation of the four-stroke internal combustion engine will be explained.

(Compression Stroke) As shown in FIG. 2, the compression of the air-fuel mixture in the cylinder 20 is exactly the same as in the conventional four-stroke internal combustion engine, but in the present invention, the mixture is vaporized during the compression stroke. The air-fuel mixture from 313 is taken in. That is, when the piston 21 rises and the crank chamber 22 becomes negative pressure, the reed pulp 15 opens and the air-fuel mixture from the carburetor 13 is sucked into the crank chamber 22 by the negative pressure. On the other hand, the lead pulp 24 is closed because the crank chamber 22 is under negative pressure.

(Expansion Stroke) As shown in FIG. 3, the ignition and explosion of the air-fuel mixture in the cylinder 20 are exactly the same as in the conventional four-stroke internal combustion engine, but in the present invention, during the expansion stroke, the air-fuel mixture is ignited and exploded. Perform primary compression. In other words, the pressure caused by the explosion of the air-fuel mixture ignited by the spark plug 19 in the cylinder 20 causes the piston to
1 moves from the top dead center toward the bottom dead center, and the pressure inside the crank chamber 22 increases.

This pressure increase closes the reed pulp 15, seals the air-fuel mixture in the crank chamber 22, and as the piston 21 descends, it is primarily compressed. When the pressure in the crank chamber 22 becomes higher than the pressure in the mixture reservoir chamber 25, the reed pulp 24 opens to introduce the mixture into the mixture reservoir chamber 25 and increase its pressure. (Exhaust stroke) As shown, the exhaust of the burned gas in the cylinder 20 is the same as in the conventional four-stroke internal combustion engine, but in the present invention, as the pressure in the crank chamber 22 increases and the piston 21 becomes negative and positive, IJ -t”/4rup24
is closed, and the mixture primarily compressed in the crank chamber 22 is sealed in the mixture reservoir chamber 25. At this time, the unburned fuel gas that entered the crank chamber 22 through the gap between the piston 21 and the cylinder 20 is primarily compressed together with the air-fuel mixture taken into the crank chamber, and is pushed out into the mixture reservoir chamber 25. It will be sealed there.

When the piston 21 rises and the pressure inside the crank chamber 22 becomes further negative, the reed valve 15 opens to guide the air-fuel mixture to the crank chamber 22.

(Intake Stroke) As shown in FIG. 5, as the intake nozzle 17 opens, the primary compressed mixture flows into the cylinder 20 from the mixture reservoir chamber 25, and the pressure in the mixture reservoir chamber 25 increases. starts to decrease.

On the other hand, in the crank chamber 22, the piston 21 descends and the pressure begins to rise, causing the reed knob 15 to close.

When the pressure in the crank chamber further increases and exceeds the pressure in the air-fuel mixture reservoir chamber 25, the reed nozzle 24 opens and the air-fuel mixture that has been primarily compressed in the crank chamber 22 flows into the air-fuel mixture reservoir chamber 25. , further moves into the cylinder 20 while the intake knock valve 17 is open. Thereafter, the process moves to the compression stroke shown in FIG. 2, and the series of operations is repeated.

In the above series of operations, the air-fuel mixture from the carburetor 13 is taken into the crank chamber 22 during the compression stroke and the exhaust stroke, and is then primarily compressed and taken into the cylinder 20.
The boost pressure is higher than that of a conventional naturally aspirated four-stroke gasoline internal combustion engine. Therefore, according to the present invention, the output per unit displacement of a four-stroke gasoline internal combustion engine can be improved. Further, the prono gas that leaks from the gap between the piston 21 and the cylinder 20 and accumulates in the crank chamber 22 is mixed with the intake air-fuel mixture and re-burned.

Furthermore, since the air-fuel mixture from the carburetor 13 is taken in each of the compression stroke and the exhaust stroke, the usage efficiency of the carburetor 13 is improved.

〔Effect of the invention〕

As explained above, the present invention has a configuration in which the air-fuel mixture is compressed in the crank chamber, thereby increasing the boost pressure and improving the output of the prime mover. This has the effect of being able to remove blow-by gas without using a reducing device and improving the usage efficiency of the vaporizer.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a diagram showing the compression stroke of the engine shown in Fig. 1, and Fig. 3 is an expansion diagram of the engine shown in Fig. 1. Figure 4 is a diagram showing the exhaust stroke of the engine shown in Figure 1, Figure 5 is a diagram showing the intake stroke of the engine shown in Figure 1, and Figure 6 is a diagram showing the engine stroke. A configuration diagram of a conventional four-stroke gasoline internal combustion engine, FIG. 7 is a diagram showing the intake stroke of the engine shown in FIG. 6, and FIG. 8 is a diagram showing the compression stroke of the engine shown in FIG. 6. , FIG. 9 is a diagram showing the expansion stroke of the engine shown in FIG. 6, and FIG. 10 is a diagram showing the exhaust stroke of the engine shown in FIG. 6. 13... Vaporizer, 15... Reed pulp (on/off valve)
, 17...Intake valve, 18...Exhaust valve, 20...Cylinder, 22...Crank chamber, 24...Reed pulp (on/off valve), 25...Mixture reservoir chamber Patent applicant NEC Corporation Ma Figure 1 Figure 3 Figure 7 Figure 4? ? Figure 5? ? Figure 6 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] (1) In a 4-stroke internal combustion engine, in which the cylinder is equipped with intake and exhaust valves and the air-fuel mixture explodes once in the cylinder with two rotations of the crankshaft, a carburetor that turns fuel and lubricating oil into a mixture is installed in the crank chamber. In addition to connecting via an on-off valve,
The inlet side of a mixture reservoir chamber, which temporarily stores the air-fuel mixture etc. that has been primarily compressed in the crank chamber, is connected to the crank chamber via an on-off valve, and the outlet side of the mixture reservoir chamber is connected to the cylinder via an intake valve. A four-stroke internal combustion engine characterized by being connected to the