KR0153162B1 - Air intake duct device for internal combustion engine - Google Patents

Abstract

Prevents damage to the resonator resonance chamber by oil mist in blow-by gas. An internal combustion engine having a box-shaped container 6 that forms a resonance chamber 7 around the intake duct 4 and connecting the intake duct 4 and the resonance chamber 7 through a passage hole 8. In the intake duct apparatus of the present invention, the passage hole 8 is opened in the resonance chamber 7 so as to be upwardly above the horizontal, and the inlet 11 of the blow-by ventilation passage 10 is connected to the resonance chamber 7 so as to open the passage hole 8. 11 is opened above the passage hole 8.

Description

Intake duct device of internal combustion engine

1 is an overall plan view showing a first embodiment of the present invention.

2 is a perspective view of a resonater of a first embodiment of the present invention.

3 is a plan view of the resonator of the first embodiment of the present invention.

4 is a cross-sectional view of the resonator of the first embodiment of the present invention.

5 is a cross-sectional view of a resonator showing a second embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

4: Intake duct 5: Resonater

6: box-shaped container 7: resonance chamber

8: passage hole 10: blow-by ventilation passage

11,13: inlet 15: throttle valve

16: auxiliary air valve

[Industrial use]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake duct device of an internal combustion engine having a resonater that reduces intake noise.

[Prior art]

In order to reduce the noise of the intake system such as the intake noise due to the intake pulsation of the internal combustion engine and the valve noise due to the opening and closing of the intake exhaust valve, a Helm Holtz type resonator is installed in a part of the intake passage. A number of proposals have been proposed, including subheading 62-137378 and Utility Model Publication No. 3-43576.

These are set from the relationship with the frequency range of intake noise aimed at reducing the cross-sectional area of the resonant passage, the volume of the resonant chamber, etc. by setting up a box-shaped space that connects to the intake passage via the resonant passage. It is possible to reduce and reduce the intake noise due to the resonance effect of Naator.

However, in order to return the blow-by gas of the internal combustion engine to the intake machine, a branch of the blow-by ventilation path is branched upstream of the intake machine, and a passage for introducing the blow-by gas downstream of the throttle valve is installed in the sliding movement between the piston and the cylinder. The blow-by gas blown into the crank chamber is refluxed to the intake system to be burned again.

In this case, the outlet of the blow-by ventilation air is installed downstream from the outlet of the auxiliary air passage that bypasses and supplies the throttle valve to control the idle rotation, and the blow-by ventilation air passage during high load and high rotational operation of the engine. Even if some blow-by gas flows backward, the oil mist does not flow into the auxiliary air passage, thereby preventing oil from adhering to the auxiliary air valve and ensuring stability of control.

[Problems to Solve Invention]

However, when these resonators, blow-by ventilation passages, auxiliary air passages, and the like are connected to the intake passages, it is difficult to connect them to positions where functional interference with each other can be avoided due to spatial constraints.

In order to reduce the space and simplify the piping configuration, it is possible to directly connect the blow-by ventilation passage to the resonance chamber of the resonator connecting to the intake passage and extract blow-by ventilation air via the resonator. If the blow-by gas flows back to the blow-by ventilation passage such as high load and high rotation of the engine, and the blow-by gas stays in the resonance chamber, the oil mist in the blow-by gas is separated and remains in the resonance chamber, and the resonance chamber is damaged by oil. Cause

In addition, even when the outlet of the auxiliary air passage described above is connected to the resonance chamber of the resonator, oil mist in the reverse flow blow-by gas flows into the auxiliary air passage, causing a problem of fouling due to oil mist of the auxiliary air valve.

SUMMARY OF THE INVENTION The present invention solves such a problem and aims to prevent fouling of a resonance chamber by oil mist in blow-by gas and to prevent same fouling of auxiliary air passages.

[Means for solving the problem]

Accordingly, the first invention provides an intake duct apparatus of an internal combustion engine in which a box-shaped container is formed in a part of an intake duct, and is connected through a hole through the intake duct and the resonance chamber. Furthermore, the resonator chamber is opened upward in the resonance chamber, and the inlet of the blow-by ventilation passage is connected to the resonance chamber, and the inlet is opened above the passage hole.

According to a second aspect of the present invention, the blow-by ventilation opening is opened in a resonance chamber wall near the direction in which the fryer passage hole is directed.

In the first invention, the third invention is located at the same side in the horizontal direction with respect to the axis center of the intake passage between the blow-by ventilation inlet and the passage hole.

In the fourth invention, the inlet of the auxiliary air passage bypassing the intake throttle valve is connected to the resonance chamber in the first invention to open the auxiliary air inlet above the blow-by ventilation inlet.

According to a fifth aspect of the present invention, the inlet of the auxiliary air passage is opened at a position where the distance between the inlet of the auxiliary air passage hole and the passage hole is longer than the distance connecting the inlet and the passage hole of the blow-by ventilation passage. .

In a fourth aspect of the invention, the inlet of the blow-by ventilation passage and the inlet of the auxiliary air passage are located on different sides in the horizontal direction with respect to the axis center of the intake passage.

In the seventh aspect of the present invention, there is provided a box-shaped container that forms a resonance chamber in a part of an intake duct, and in the intake duct apparatus of an internal combustion engine which connects the intake duct and the resonance chamber through a passage hole, It is divided into two resonance chambers, and one of the resonance chambers has an inlet of the blow-by ventilation passage, and the other resonance chamber has an opening of an auxiliary air passage bypassing the intake throttle valve, and a passage hole of the intake duct for each resonance chamber. The passage holes of the resonance chamber through which the blow-by ventilation openings are opened are arranged below the blow-by ventilation openings.

In the eighth invention, in the seventh invention, the auxiliary air inlet is disposed at a position higher than the blow-by ventilation inlet, while the passage hole of the resonance chamber in which the blow-by ventilation inlet is opened is directed to the blow-by ventilation inlet. The passage hole of the resonance chamber in which the auxiliary air inlet other than the passage hole of the resonance chamber opened is opened at a high position.

[Action]

In the first invention, when some blow-by gas flows back to the resonance chamber in the blow-by ventilation passage at high speed and high load of the engine, the flow velocity decreases due to the expansion of the flow path cross-sectional area in the resonance chamber, and the oil mist falls by gravity, but blow-by It is lower than the ventilation inlet, and the passage hole of the intake duct opens upward, and strong negative pressure is generated in the intake duct at the high speed and high load of the engine, so that the reverse blow-by gas is sucked into the intake duct through the passage hole. This can prevent oil mist from remaining in the resonance chamber.

In the second invention, since the passage hole of the intake duct is directed to the blow-by ventilation inlet, the blow-by gas flowed back to the resonance chamber is sucked into the intake duct with strong suction force, and oil mist retention in the resonance chamber is prevented.

In the third invention, since the blow-by ventilation inlet and the passage hole of the intake duct are on the same side, the distance between them is short, and the flow-back blow-by gas is efficiently sucked into the intake duct without remaining in the resonance chamber.

In the fourth invention, the oil mist in the reversed blowby gas is prevented from entering the auxiliary air passage because the inlet of the auxiliary air passage is opened above the blowby ventilation inlet, while preventing the retention of the reversed blowby gas in the resonance chamber. It is difficult to enter and the contamination by oil mist in auxiliary air passage is prevented.

In the fifth invention, the distance from the blow-by ventilation inlet to the passage hole is longer than the distance from the passage hole, so that the reverse blow-by gas is easily introduced into the passage hole and the stay in the resonance chamber is prevented and the auxiliary air passage is prevented. It can prevent the contamination by oil mist.

In the sixth invention, since the blow-by ventilation inlet and the auxiliary air inlet are located on opposite sides with respect to the intake duct, the reversed blow-by gas is less likely to enter the auxiliary air passage than the passage hole, and the auxiliary air passage is prevented from staying in the resonance chamber. The contamination by oil mist is prevented.

In the seventh invention, the inside of the resonance chamber is divided into a resonance chamber to which the blow-by ventilation passage and the auxiliary air passage are connected, and since the passage hole is provided below the blow-by ventilation opening, the blow-by gas flowed back to one resonance chamber is The air is sucked into the intake duct without remaining in the resonance chamber, thereby preventing fouling by the oil mist, and the inflow of blow-by gas into the auxiliary air passage connected to the other resonance chamber is surely prevented.

In the eighth invention, the passage hole of the intake duct is directed to the blow-by ventilation inlet, so that the reversed blow-by gas does not stay in the resonance chamber and is easily sucked into the intake duct, and the contamination by oil mist of the resonance chamber is prevented. In addition, the passage hole of the resonance chamber in which the auxiliary air inlet is opened is higher than the passage hole of the resonance chamber in which the blow-by ventilation opening is opened, and the auxiliary air inlet is the resonance of the other side with respect to the blow-by ventilation opening. Since the opening is above the chamber, the oil mist rarely enters the auxiliary air passage via the other resonance chamber, and the contamination by the oil mist is reliably prevented.

EXAMPLE

1 to 4 show a first embodiment of the present invention, wherein the intake manifold 2 and the air cleaner 3 of the engine main body 1 are connected with the intake duct 4 interposed therebetween. In the middle of 4), the resonator 5 is mounted as shown in FIGS. 2 to 4 to reduce intake noise.

The resonator 5 penetrates the center of the box-shaped container 6 so that the intake duct 4 is air sealed, and the resonance chamber 7 and the intake duct 4 formed inside the container 6 have passage holes 8. And the volume of the resonance chamber 7 and the cross-sectional area of the passage hole 8 are appropriately set so as to resonate with the frequency region (engine speed range region) of the intake noise aimed at noise reduction. In addition, the intake duct 4 may have a structure in which the box-shaped container 6 is provided around a part of the intake duct 4 without penetrating the center of the box-shaped container 6.

The air inlet 11 of the blow-by ventilation passage 10 is connected to the side wall surface of the box-shaped container 6 in the direction orthogonal to the intake duct 4, and the air inlet 11 of the box-shaped container 6 is connected to the inlet duct 4. The inlet 13 of the auxiliary air passage 12 is connected to the side wall surface position higher than the inlet 11 as the side opposite to the horizontal direction with the passage hole 8 interposed therebetween in a direction substantially parallel to the intake duct 4. In addition, the box-shaped container 6 connects the inlet 11 of the blow-by ventilation path 10 to the side which has a substantially wedge-shaped flat box shape and large cross-sectional area.

The passage hole 8 of the intake duct 4 penetrating the center of the box-shaped container 6 faces almost the same axial line as the inlet 11 of the blow-by ventilation passage 10 and is lower than the inlet 11. In addition, it is also installed upwardly inclined toward the inlet (11).

The blow-by ventilation passage 10 is connected to the upper lock room of the engine main body 10 to send the blow-by air for the blow-by gas, and blows the blow-by gas blown into the crank room from the sliding movement of the piston and cylinder (not shown). A suction reflux is provided downstream of the throttle valve 15 of the intake passage.

The auxiliary air passage 12 introduces auxiliary air into the intake passage by bypassing the throttle valve 15, and the auxiliary air valve whose opening degree is adjusted by a controller (not shown) to control the introduction amount according to the engine operating conditions. 16 is installed.

[Action]

Among the intake noises generated by the operation of the engine, the propagation upstream of the intake duct 4 has a resonance effect in the resonance chamber 7 connecting through the passage hole 8 in the part of the resonator 5. Attenuation and reduction by

On the other hand, auxiliary air is introduced by bypassing the throttle valve 15 from the inlet 13 of the auxiliary air passage 12 connected to the resonance chamber 7, and the rotation speed is appropriately increased or decreased depending on the driving state of the engine auxiliary machine. Similarly, in the inlet 11 of the blow-by ventilation passage 10 connected to the resonance chamber 7, air for ventilation is introduced into the crank room in response to the reflux amount of the blow-by gas downstream of the throttle valve 15.

When the blow-by gas is increased at high speed and high load of the engine and the processing capacity of the blow-by control valve (not shown) is exceeded, part of the blow-by gas flows back into the resonance chamber 7 in the blow-by ventilation passage 10. do. The reflux blow-by gas contains a small amount of oil mist, but flows into the resonant chamber 7 of the cross-sectional area rapidly expanding in the blow-by ventilation passage 10 and at the same time, the flow rate is greatly reduced and the gravity is large due to gravity. Mist falls. In addition, a passage hole 8 of the intake duct 4 is opened below the inlet 11 of the blow-by ventilation passage 10, and high negative pressure is generated in the intake duct 4 at high speed and high load. As a result, many of the blow-by gases including the reversed oil mist are sucked into the intake duct 4 via the passage holes 8 without remaining in the resonance chamber 7.

The auxiliary air is sucked from the resonance chamber 7 into the auxiliary air passage 12 as described above, but the inlet 13 is disposed between the inlet duct 4 and the inlet 11 of the blow-by ventilation passage 10. The oil mist in the blow-by gas is hardly sucked directly into the auxiliary air passage 12 because it is on the opposite side, and is located at a position higher than the reflux point on the blow-by gas.

Therefore, the oil mist stays in the internal resonance chamber 7 of the resonator 5 and is damaged or the oil mist flows into the auxiliary air passage 12 so that the oil mist is attached to the auxiliary air valve 16 so that the flow rate control is performed. Destabilization is certainly prevented.

In addition, since the blow-by ventilation passage 10 and the auxiliary air passage 12 are directly attached to the box-shaped container 6 of the resonator 5 provided in a part of the intake duct 4, these piping connections are made. The work is easy and can be condensed spatially and concisely.

Next, another embodiment of FIG. 5 will be described.

In this embodiment, the inside of the box-shaped container 6 of the resonator 5 is separated into two resonance chambers 7a and 7b by the partition 17, and the blow-by ventilation passage 10 of one resonance chamber 7a is provided. ), The inlet 11 of the auxiliary air passage 12 is opened in the other resonance chamber 7b so that the inlet 13 is positioned above the inlet 11 and the intake duct 4 For each of the two through holes (8a, 8b) through the connection through each. In this case, the passage hole 8a which is connected to the resonance chamber 7a is installed so as to face the inlet 11 of the blow-by ventilation passage 10 and is located slightly below, and the passage hole which is connected to the resonance chamber 7b. 8b) is located above this passage hole 8a.

In this way, the inside of the box-shaped container 6 of the resonator 5 is separated into two resonance chambers 7a and 7b, and the blow-by ventilation passage 10 and the auxiliary air passage 12 are respectively located in different rooms. Since the blow-by gas flows back into the resonance chamber 7a such as a high speed and a high load, a large amount is directly sucked into the intake duct 4 through the passage hole 8a, and the resonance chamber ( The oil mist in the countercurrent blow-by gas because the passage hole 8b to 7a is above and the inlet 13 of the auxiliary air passage 12 is located above the inlet 11 of the blow-by ventilation passage 10. Is very unlikely to be sucked into the auxiliary air passage 12.

Therefore, according to this embodiment, the oil mist in the flow-back blow-by gas is sucked into the intake duct 4 without remaining in the resonator 5 and is almost never sucked into the auxiliary air passage 12 by the oil mist. It is possible to reliably prevent contamination of the resonator 5 and the auxiliary air valve 16 caused by this.

[Effects of the Invention]

As described above, according to the first invention, even when some blow-by gas flows back into the resonance chamber in the high-speed, high-load blow-by ventilation passage, the passage hole of the intake duct opens downward from the blow-by ventilation inlet and above the horizontal. In addition, since the strong negative pressure is generated in the intake duct at high speed and high load of the engine, the reversed blow-by gas is not sucked into the intake duct through the passage hole and stays in the resonance chamber. It is possible to surely prevent fouling.

According to the second invention, since the passage hole of the intake duct is directed to the blow-by ventilation inlet, the blow-by gas flowed back to the resonance chamber is sucked into the intake duct with high suction force to prevent oil mist retention and fouling in the resonance chamber. .

According to the third invention, since the blow-by ventilation inlet and the passage hole of the intake duct are on the same side, the distance between them is short, and the flow-back blow-by gas is efficiently sucked into the intake duct without remaining in the resonance chamber.

According to the fourth aspect of the present invention, oil mist in the reversed blowby gas is introduced into the auxiliary air passage since the inlet of the auxiliary air passage is opened above the blowby ventilation inlet and prevents blowby gas retention in the resonance chamber. Difficult to prevent fouling by oil mist in auxiliary air passages.

According to the fifth invention, the distance from the blowby ventilation inlet to the passage hole is longer than the distance from the passage hole, so that the reversed blowby gas is more likely to enter the passage hole than the auxiliary air passage and is caused by the oil mist of the resonance chamber. In addition to preventing fouling, it is possible to prevent contamination by oil mist in the auxiliary air passage.

According to the sixth invention, since the blow-by ventilation inlet and the auxiliary air inlet are located on opposite sides with respect to the intake duct of the resonance chamber, the reversed blow-by gas is less likely to enter the auxiliary air passage than the passage hole, and the resonance chamber is damaged by the oil mist. It is prevented from being prevented and the contamination by oil mist of the auxiliary air passage is prevented.

According to the seventh invention, when the inside of the resonance chamber is separated from the resonance chamber to which the blow-by ventilation passage and the auxiliary air passage are connected, the blow-by gas flowed back to one resonance chamber because a passage hole is provided below the blow-by ventilation opening. Is sucked into the intake duct without staying in the resonance chamber, thereby preventing fouling by the oil mist of the resonance chamber and ensuring the inflow of blow-by gas into the auxiliary air passage connected to the other resonance chamber.

According to the eighth invention, since the passage hole of the intake duct is directed to the blow-by ventilation inlet, the reversed blow-by gas is not easily retained in the resonance chamber and is easily sucked into the intake duct, thereby preventing contamination by the oil mist of the resonance chamber. And the auxiliary air inlet of the resonance chamber is located at a higher position than the passage hole of the resonance chamber in which the blowby ventilation inlet is opened, and the auxiliary air inlet is the resonance of the other side with respect to the blowby ventilation inlet. Since the opening is above the chamber, the oil mist is reliably prevented, with little oil mist flowing into the auxiliary air passage via the other resonance chamber.

Claims (8)

In the intake duct apparatus of an internal combustion engine in which a box-shaped container is formed in a part of the intake duct, and the intake duct and the resonance chamber are connected through a passage hole. The passage hole is directed upward above the horizontal. An intake duct apparatus for an internal combustion engine, characterized in that the inlet of the blow-by ventilation passage is connected to the resonance chamber, and the inlet is opened above the passage hole. The intake duct device of an internal combustion engine according to claim 1, wherein said blow-by ventilation inlet is opened in a resonance chamber wall near the direction in which said passage hole is directed. The intake duct apparatus of an internal combustion engine according to claim 1, wherein the blow-by ventilation inlet and the passage hole are located on the same side in the horizontal direction with respect to the axis center of the intake passage. The intake duct apparatus of an internal combustion engine according to claim 1, wherein an inlet of an auxiliary air passage bypassing the intake throttle valve is connected to the resonance chamber, and the auxiliary air inlet is opened above the blow-by ventilation inlet. The inlet of the auxiliary air passage is formed in a position where the distance between the inlet of the auxiliary air passage hole and the passage hole is longer than the distance connecting the inlet of the blow-by ventilation passage and the passage hole. Intake duct device of an internal combustion engine. The intake duct apparatus of an internal combustion engine according to claim 4, wherein the inlet of the blow-by ventilation passage and the inlet of the auxiliary air passage are located at different sides in the horizontal direction with respect to the axis center of the intake passage. In the intake duct apparatus of an internal combustion engine which has provided the box-shaped container which forms a resonance chamber in a part of an intake duct, and makes this intake duct and a resonance chamber connect through a passage hole, The inside of the resonance chamber has two partitions. Separate the resonant chamber and connect the inlet of the blow-by ventilation passage to one of the resonant chambers, and open the inlet of the auxiliary air passage bypassing the intake throttle valve to the other resonant chamber to connect the passage holes of the intake duct to each resonant chamber, respectively. An air intake duct device of an internal combustion engine, wherein a passage hole of a resonance chamber through which the blow-by ventilation inlet is opened is disposed below the blow-by ventilation inlet. 8. The resonance according to claim 7, wherein the auxiliary air inlet is disposed at a position higher than the blow-by ventilation inlet, while the passage hole of the resonance chamber in which the blow-by ventilation inlet is opened is directed to the blow-by ventilation inlet. An intake duct device of an internal combustion engine, characterized by providing a passage hole in a resonance chamber in which an auxiliary air inlet on the other side of the chamber is opened at a higher position.