JP3707376B2 - In-vehicle engine intake system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-vehicle engine intake device, and more particularly to an intake device including a variable intake valve having a variable intake pipe length in a surge tank.
[0002]
[Prior art]
Conventionally, as this type of intake device, for example, the one described in Japanese Utility Model Laid-Open No. 4-125610 is known.
[0003]
As shown in FIG. 6, the intake device includes an intake passage 100, a surge tank 101 connected to the downstream side of the intake passage 100 and having a variable intake valve 103 therein, and a downstream side of the surge tank 101. A plurality of ports 102 connected to each other, and a throttle valve 105 on the upstream side of the surge tank 101 for opening and closing the intake passage 100.
[0004]
Further, as shown in FIG. 7 as a sectional view taken along line 7-7 in FIG. 6, the inside of the surge tank 101 is partitioned into two chambers by a partition plate 104. A part of the partition plate 104 is extended into the intake passage 100, and the intake passage 100 is also divided into two passages in the vicinity of the surge tank 101. The two chambers in the surge tank 101 communicate with the intake passage 100, and one of the two chambers communicates with the port 102a and the other communicates with the port 102b. And the said variable intake valve 103 is accommodated in the through-hole formed in the partition plate 104 so that rotation is possible.
[0005]
The variable intake valve 103 is controlled to be opened and closed so as to shut off the two chambers of the surge tank 101 in the low and medium speed ranges of the engine, and communicate with the two chambers in the high speed range of the engine.
[0006]
By opening and closing the variable intake valve 103 in this way, the merging position of the port 102a and the port 102b connected to the two chambers of the surge tank 101 at the low speed and medium speed ranges of the engine is It comes to the upstream end, and the effective intake pipe length, that is, the distance from this merging position to the combustion chamber of the engine becomes longer. On the other hand, in the high speed region of the engine, the merging position comes to the through hole of the partition plate 104 in which 103 is accommodated, and the effective intake pipe length is shortened. As described above, by switching the effective intake pipe length in accordance with the operating state of the engine, a suitable torque characteristic can be obtained in the entire operating range.
[0007]
[Problems to be solved by the invention]
By the way, in an intake system of an in-vehicle engine having such a variable intake valve, abnormal noise may occur if a large amount of air is sent into the surge tank 101. In particular, when the throttle valve 105 is suddenly opened in response to an acceleration request or the like, the engine noise or the like emitted from the vehicle is relatively low. Cannot be ignored.
[0008]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an in-vehicle engine intake device capable of suitably suppressing the generation of abnormal noise caused by mounting a variable intake valve. It is in.
[0009]
[Means for Solving the Problems]
The means for achieving the above object and the effects thereof will be described below.
According to the first aspect of the present invention, the interior of the surge tank connected to the intake passage of the in-vehicle engine is partitioned into a plurality of spaces by a partition plate, and the same hole is opened and closed in a through hole formed in the partition plate. In an in-vehicle engine intake system provided with a variable intake valve that switches between the presence or absence of communication of these spaces, the vehicle includes an rectifying means that regulates the contact of air flowing into the surge tank with the variable intake valve. The gist.
[0010]
According to the above configuration, even if a large amount of intake air is sent from the intake passage into the surge tank, the air flow of the intake air is restricted from hitting the variable intake valve by the rectifying means. For this reason, generation | occurrence | production of the noise mentioned above resulting from mounting the variable intake valve comes to be suppressed suitably. Further, by restricting the contact of the airflow with the variable intake valve, the airflow resistance due to the turbulence of the airflow is reduced, and further performance improvement of the engine is expected.
[0011]
According to a second aspect of the present invention, in the in-vehicle engine intake device according to the first aspect, the variable intake valve is provided in a position separated from a connection portion with the intake passage in the surge tank, The rectifying means is characterized in that one side wall of the intake passage is formed as a rectifying plate extending to the vicinity of the variable intake valve.
[0012]
According to the above configuration, the rectifying means can be configured simply, and abnormal noise is newly generated due to the flow of intake air sent from the intake passage into the surge tank hitting the rectifying means. Will be able to avoid.
[0013]
According to a third aspect of the present invention, in the in-vehicle engine intake device of the second aspect, the rectifying plate has an end portion on the downstream side of the rotation axis of the variable intake valve and an outer peripheral portion of the valve. The gist is that it is located in the vicinity of the part where the crosses.
[0014]
According to the above configuration, the intake air can be sent substantially evenly to each port of the intake manifold connected to the downstream side of the surge tank.
The gist of the invention described in claim 4 is that, in the in-vehicle engine intake device according to claim 2 or 3, the rectifying plate is provided slightly spaced from the partition plate.
[0015]
In such an intake device, the sealing performance between the plurality of spaces in the surge tank when the variable intake valve is closed is an important factor. However, when the rectifying plate is in contact with or connected to a partition plate that partitions these spaces, the intake pulsation transmitted to the rectifying plate is also directly transmitted to the partition plate, and the partition plate and the partition plate are provided. There is a concern that the sealing performance with the variable intake valve may be reduced.
[0016]
In this respect, according to the above configuration, even if the rectifying plate vibrates due to the pulsation of the intake air sent from the intake passage, the vibration is not transmitted to the partition plate, and the deterioration of the sealing performance is suitably suppressed. Will be able to.
[0017]
The gist of the invention described in claim 5 is that, in the in-vehicle engine intake device according to any one of claims 1 to 4, the surge tank is made of a resin casing.
[0018]
According to the above configuration, it is possible to accurately suppress the occurrence of the above-described abnormal noise even in the case of a resin surge tank that has a particularly high sound permeability and is susceptible to vibration.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which an in-vehicle engine intake device of the present invention is embodied will be described with reference to FIGS.
[0020]
As shown in FIG. 1, the intake device is connected to an intake passage 11 and a downstream of the intake passage 11, and includes a surge tank 12 having an intake pipe length varying mechanism 20 therein, and the surge tank 12. And an intake manifold 13 connected downstream. The intake passage 11, the surge tank 12, and the intake manifold 13 are each made of resin.
[0021]
A throttle valve 14 that adjusts the amount of intake air to the surge tank 12 is disposed in the intake passage 11.
The intake manifold 13 has a first port group 13a and a second port group 13b each having three ports in this example. These port groups 13a and 13b communicate with a combustion chamber (not shown) of the engine.
[0022]
With such a configuration, the flow rate of the intake air passing through the intake passage 11 to the surge tank 12 is adjusted according to the opening of the throttle valve 14 that is controlled based on the operating state of the engine. The intake air sent to the surge tank 12 is sent to the combustion chamber via the port groups 13 a and 13 b of the intake manifold 13.
[0023]
Further, the intake pipe length varying mechanism 20 is shown in FIG. 2 which is a cross-sectional view taken along line 2-2 in FIG. 1 and FIG. 3 which is a cross-sectional view taken along line 3-3 in FIG. A partition plate 21 that divides the inside of the surge tank 12 into two chambers, a variable intake valve 22 that is rotatably accommodated in a through hole formed in the partition plate 21, and an actuator that rotates the variable intake valve 22 30 etc. The partition plate 21 is also extended to a part of the intake passage 11 on the downstream side of the throttle valve 14, and a part of the downstream side is divided into two passages.
[0024]
In addition, the through hole of the partition plate 21 is formed with a convex portion 21a that protrudes from the inner peripheral surface of the hole and abuts on the closed surface of the valve 22 with the rotation axis of the variable intake valve 22 as a boundary. Has been. When the convex portion 21a and the variable intake valve 22 come into contact with each other, the space between the two chambers of the surge tank 12 is sealed.
[0025]
The first port group 13a of the intake manifold 13 is connected to one space of the surge tank 12 divided into the two chambers, and the second port group 13b is connected to the other space. Yes. When the variable intake valve 22 is opened, the two chambers of the surge tank 12 communicate with each other, and the merging position of the first port group 13a and the second port group 13b is the position of the through hole of the partition plate 21. This is the position to be provided. On the other hand, when the variable intake valve 22 is closed, the two chambers are shut off, and a partition plate 21 in which the merging position of the first port group 13a and the second port group 13b extends into the intake passage 11 is provided. It becomes the end of the upstream side.
[0026]
Here, the variable intake valve 22 is a normally open valve. For example, when the condition that the rotational speed of the engine is 3500 rpm or less and the opening degree of the throttle valve 14 is 30 degrees or more is satisfied, the variable intake valve 22 is closed. Is done. This condition can be arbitrarily set.
[0027]
By the intake pipe length varying mechanism 20 having the variable intake valve 22 opened and closed in such a manner, the effective intake pipe length, that is, the first port group 13a and the second port group 13b are set in the low speed and medium speed ranges of the engine. The length from the merging position to the combustion chamber becomes longer, while the length of the effective intake pipe length becomes shorter in the high speed region of the engine. Thus, as described above, the torque characteristics in the entire operating range of the engine are preferably ensured.
[0028]
Here, in the present embodiment, as shown in FIG. 3, the airflow of the intake air sent from the intake passage 11 to the surge tank 12 is prevented from directly hitting the variable intake valve 22 in the surge tank 12. For this purpose, a rectifying plate 23 is provided in such a manner that one side wall of the intake passage 11 extends to the vicinity of the variable intake valve 22. In FIG. 3, for convenience, only one space of the two chambers of the surge tank 12 is shown, but a rectifying plate 23 is similarly provided in the other space. Therefore, even when a large amount of intake air is sent from the intake passage 11 into the surge tank 12 when the variable intake valve 22 is opened, particularly when the valve 22 is suddenly opened, It is avoided that the direction of the airflow suddenly changes when hitting the variable intake valve 22. As a result, the generation of noise due to the intake air flow directly hitting the variable intake valve 22 is suppressed. Further, by restricting the contact of the airflow to the variable intake valve 22, the airflow resistance due to the turbulence of the airflow is reduced, and further performance improvement of the engine is expected.
[0029]
On the other hand, since the rectifying plate 23 is provided in such a manner that one side wall of the intake passage 11 is extended as described above, the airflow of the intake air sent from the intake passage 11 into the surge tank 12 is rectified. It is also possible to avoid the occurrence of a new abnormal sound due to hitting 23.
[0030]
On the other hand, as shown in FIG. 3, the downstream end portion of the rectifying plate 23 is provided in the vicinity of a portion where the rotation axis of the variable intake valve 22 and the outer peripheral portion of the valve 22 intersect. ing. For this reason, the intake air can be substantially uniformly fed into each port of the intake manifold 13 connected to the downstream side of the surge tank 12.
[0031]
By the way, in such an intake device, the sealing performance between the two chambers in the surge tank 12 when the variable intake valve 22 is closed is an important factor. However, when the rectifying plate 23 abuts or is connected to the partition plate 21 that partitions these spaces, the intake air pulsation transmitted to the rectifying plate 23 is directly transmitted to the partition plate 21, and the partition plate 21 There is a concern that the sealing performance between the variable intake valve 22 provided on the variable intake valve 22 is lowered.
[0032]
Therefore, in the present embodiment, as shown in FIG. 4 as a cross-sectional view taken along a line 4-4 in FIG. 1, the rectifying plate 23 is slightly separated from the partition plate 21 in the state of the surge tank 12. It is fixed to the inner surface. For this reason, even if the rectifying plate 23 vibrates due to the pulsation of the intake air sent from the intake passage 11, the vibration is suppressed from being transmitted to the partition plate 21. As a result, when the variable intake valve 22 is closed, a gap is less likely to be formed between the projecting portion 21a of the partition plate 21 and the variable intake valve 22, and the sealing performance between the two chambers of the surge tank 12 is reduced. Can be suppressed.
[0033]
As described above in detail, according to the in-vehicle engine intake device of this embodiment, many excellent effects as described below can be obtained.
(1) Since the rectifying plate 23 is provided in the surge tank 12, it is possible to suppress the generation of noise due to the intake air flow directly hitting the variable intake valve 22.
[0034]
(2) By restricting the contact of the airflow to the variable intake valve 22, the airflow resistance due to the turbulence of the airflow is reduced, and further performance improvement of the engine is expected.
[0035]
(3) Since the rectifying plate 23 is provided in such a manner that one side wall of the intake passage 11 is extended, the airflow of the intake air sent from the intake passage 11 into the surge tank 12 hits the rectifying plate 23. As a result, it is possible to avoid the occurrence of new abnormal noise.
[0036]
(4) On the other hand, since the downstream end of the rectifying plate 23 is provided in the vicinity of the rotation center of the variable intake valve 22, suction is performed to each port of the intake manifold 13 connected to the downstream side of the surge tank 12. It becomes possible to send air substantially evenly.
[0037]
(5) Even if the rectifying plate 23 vibrates due to the pulsation of the intake air sent from the intake passage 11, since the vibration is suppressed from being transmitted to the partition plate 21, a surge is generated when the variable intake valve 22 is closed. It can suppress that the sealing performance between the two chambers of the tank 12 falls.
[0038]
(6) Even in the surge tank 12 made of resin, which has a particularly high sound permeability and is prone to vibrations, it is possible to suppress the generation of abnormal noise and improve the sealing performance when the variable intake valve 22 is closed. It will be possible to secure.
[0039]
In addition, the said embodiment can also change the structure suitably as follows, for example.
In the above-described embodiment, the example of the surge tank 12 to which the port groups 13a and 13b each having three ports are connected is shown, but the number of ports is arbitrary.
[0040]
In the above embodiment, each of the intake passage 11, the surge tank 12, and the intake manifold 13 is made of resin. However, these materials are arbitrary, and may be made of aluminum, for example.
[0041]
In the above embodiment, the rectifying plate 23 is provided so as to be separated from the partition plate 21, but it may be provided so as to contact both the partition plate and the inner wall surface of the surge tank. Even with such a configuration, it is possible to suppress the occurrence of abnormal noise as described above, and to suppress the deterioration of the sealing performance when the variable intake valve 22 is closed.
[0042]
In the above embodiment, the rectifying plate 23 is provided in such a manner that one side wall of the intake passage 11 is extended. . In short, any structure may be used as long as the rectifying plate is provided so as to restrict the contact of the air flowing into the surge tank 12 with the variable intake valve 22.
[0043]
Further, the rectifying means for regulating the airflow in this way does not need to have a plate shape, and an arbitrary shape and structure can be adopted as the rectifying means.
[Brief description of the drawings]
FIG. 1 is a front view showing the appearance of an embodiment of an intake device of the present invention.
2 is a cross-sectional view taken along line 2-2 in FIG.
3 is a cross-sectional view taken along a line 3-3 in FIG.
4 is a cross-sectional view taken along a line 4-4 in FIG.
FIG. 5 is a cross-sectional view showing another embodiment of the intake device of the present invention.
FIG. 6 is a front view showing the appearance of a conventional intake device having an intake pipe length variable function.
7 is a cross-sectional view showing a cross section taken along a line 7-7 in FIG. 6;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Intake passage, 12 ... Surge tank, 13 ... Intake manifold, 13a ... 1st port group, 13b ... 2nd port group, 14 ... Throttle valve, 20 ... Intake pipe length variable mechanism, 21 ... Partition plate, 21a ... Convex part, 22 ... variable intake valve, 23 ... current plate, 30 ... actuator.

Claims (5)

The inside of the surge tank connected to the intake passage of the in-vehicle engine is partitioned into a plurality of spaces by a partition plate. In an in-vehicle engine intake system provided with an intake valve,
An in-vehicle engine intake system comprising rectifying means for restricting contact of air flowing into the surge tank with the variable intake valve. The variable intake valve is provided in the surge tank at a position separated from the connection portion with the intake passage, and the rectifying means has one side wall of the intake passage extending to the vicinity of the variable intake valve. The in-vehicle engine intake device according to claim 1, wherein the intake device is formed as a current plate. The in-vehicle engine intake system according to claim 2, wherein an end portion of the rectifying plate on the downstream side is positioned in the vicinity of a portion where a rotation axis of the variable intake valve intersects with an outer peripheral portion of the valve. The in-vehicle engine intake device according to claim 2 or 3, wherein the rectifying plate is provided slightly separated from the partition plate. The in-vehicle engine intake device according to any one of claims 1 to 4, wherein the surge tank is made of a resin casing.

Images