JPH0144783Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an engine intake passage structure having two intake passages, a first intake passage and a second intake passage, which are partially independent from each other.

(Prior Art) In the intake passage of an engine, there are partially two independent intake passages, a first intake passage and a second intake passage.
There are some that are configured as two intake passages. In other words, when obtaining resonant supercharging, which is a type of dynamic effect of intake air, for example, as shown in Japanese Patent Publication No. 57-2892, each cylinder of the first cylinder group whose firing order is not consecutive to each other is independently activated. 1 surge tank (first intake expansion chamber), while each cylinder of the second cylinder group whose ignition order is not consecutive to each other is connected independently to the second surge tank, and both surge tanks are connected to the first surge tank (first intake expansion chamber). It is connected to a third surge tank via two second intake passages, and the first and second intake passages are independent from each other.

(Problems to be Solved by the Invention) By the way, when configuring the first and second intake passages that are independent of each other, it is generally required that these portions have a fairly long predetermined length;
If both intake passages were constructed from independent passage members (intake pipe members), the volume occupied by the intake passages, especially the area occupied in the cross-sectional direction, would become large, making it difficult to manage them and make the engine as a whole more compact. The problem arises above.

Further, the upstream side of the first and second intake passages is generally a common intake passage where the two intake passages are connected. How to configure the connecting portion to the common intake passage with the passage, that is, the upstream merging portion of the first intake passage and the second intake passage is a problem from the viewpoint of connection work and the like.

Therefore, an object of the present invention is to reduce the area occupied in the cross-sectional area of two partially independent intake passages to make them as compact as possible. It is an object of the present invention to provide an intake passage structure for an engine that allows easy connection of an intake passage and a second intake passage to a common intake passage.

(Means and actions for solving the problem) In order to achieve the above-mentioned object, the present invention basically defines the interior of one passage member by a partition wall, thereby solving the problem. A first intake passage and a second intake passage are configured within the book passage member. As a result, compared to the case where separate passage members are provided for the first intake passage and the second intake passage,
The area occupied in the cross-sectional area direction can be made as small as possible.

Further, the partition wall that defines the first intake passage and the second intake passage does not exist at the upstream end of the passage member, and the upstream end of the passage member is connected to the first intake passage. It is configured as a merging portion of the passage and the second intake passage. Accordingly, the passage member can be connected to the common intake passage on the upstream side by connecting only one passage member, and the connection work can be easily performed. It turns out.

Further, an intake expansion chamber is provided immediately upstream of the first and second intake passages. As a result, the intake air on the upstream side of the first and second intake passages is smoothly distributed to the first and second intake passages by the intake expansion chamber.

Furthermore, the intake passage is formed by stacking and joining a pair of side wall members and a partition plate. This allows for easy assembly.

Specifically, the configuration is as follows. That is, a first intake passage and a second intake passage, which are partially independent of each other, are formed by defining one intake passage with a partition plate, and within the one intake passage,
In the engine intake passage structure including a confluence part where both the intake passages are connected on the upstream side of the partition plate, the one intake passage is formed by joining a pair of side wall members facing each other, The partition plate is joined to the pair of side wall members while being sandwiched between the joint parts of the pair of side wall members, and the one intake passage includes the pair of side wall members at a confluence part immediately upstream of the partition plate. An intake expansion chamber is formed by bulging the side wall members outward, respectively.
There is a structure.

(Example) Hereinafter, an example of the present invention in which resonance supercharging is obtained will be described based on the attached drawings.

In FIG. 1, the engine body E has a first cylinder group A consisting of three cylinders 1, 2, and 3, and a second cylinder group B consisting of three cylinders 4, 5, and 6, which form a V-shape with each other. It is configured as a V type 6 cylinder arranged as follows. The ignition order of each cylinder 1 to 6 above is as follows:
For example, the firing order is set as 1 → 5 → 3 → 6 → 2 → 4, so that the firing order of each cylinder 1, 2, and 3 of the first cylinder group A is not consecutive, and similarly, each cylinder 4 of the second cylinder group B ，
5 and 6 are also arranged so that the firing order is not consecutive.

A surge tank 7 is disposed between the cylinder groups A and B, that is, in the central space of the V bank, and in the embodiment, the surge tank 7 is a first surge tank 8.
It is also used as a second surge tank 9. That is, the surge tank 7 is connected to the partition wall 10
Therefore, the side closer to the first cylinder group A is the first intake expansion chamber 11 for the first surge tank 8, while the side closer to the second cylinder group B is the second intake expansion chamber 11 for the second surge tank 9. This is an intake expansion chamber 12. Each of the cylinders 1, 2, and 3 of the first cylinder group A is individually and independently connected to (the first intake expansion chamber 11 of) the first surge tank 8 via independent intake pipes 13 to 15. . Furthermore, the cylinders 4, 5, and 6 of the second cylinder group B are individually and independently connected to (the second intake expansion chamber 12 of) the second surge tank 9 via independent intake pipes 16 to 18. There is.

The surge tank 7 further includes a passage member 19.
An air cleaner 20 is connected via. In the embodiment, this passage member 19 is connected to the air cleaner 2.
In order from the 0 side, first intake pipe 21, second intake pipe 2
2, a throttle body 23, and the second intake pipe 22 and the throttle body 23 are connected by a connector 24. Then, from the second intake pipe 22 to the throttle body 23
Until then, a first intake passage 26 and a second intake passage 27 are separated from each other by a partition wall 25 shown by a broken line in FIG. The second intake passage 27 is independently connected to the second surge tank 9 (the second intake expansion chamber 12).
Then, the first intake pipe 21 connects the second intake pipe 2
The area from the upstream end of 2 to the air cleaner 20 is
The first intake pipe 21 is configured as one common intake passage 28 that is continuous with both the intake passages 26 and 27, and a supercharger 29 is connected to the first intake pipe 21.

With the above configuration, as is well known, in a predetermined engine speed range, improvement in intake air filling efficiency due to the resonance effect is achieved.

The second intake pipe 22 is elongated,
In the embodiment, the structure is made by integrating plate materials divided into three parts in the cross-sectional area direction. That is, as shown in FIGS. 2 to 6, a pair of side wall members 41 and 42 each having a curved cross section by press molding are opposed to each other, and the partition is provided between the two side wall members 41 and 42. Partition plate 4 made of a metal plate forming a part of wall 25
With 3 held between them, these three people 41, 42,
43 are joined together. In addition,
This joining is performed by welding at the flange portions 41a and 42a formed except for both end portions of the side wall members 41 and 42.
The intermediate portion where 2a does not exist is brazed. That is, the second intake pipe 22
Because the connector 24 is fitted to the outer periphery of the downstream end, and the first intake pipe 2 is fitted to the outer periphery of the upstream end.
1 is fitted, the flange portions 41a and 42a are provided at the upstream and downstream ends of the second intake pipe 22, respectively.
is assumed not to exist. Of course, one side wall member 41 and the partition plate 43 allow the first
First intake passage 22A showing a part of the intake passage 26
However, due to the other side wall member 42 and the partition plate 43, the second air intake passage forming a part of the second intake passage 27 described above is
An intake passage portion 22B is configured.

Here, the downstream end surface of the partition plate 43 is made slightly longer than the downstream end surfaces of the both side wall members 41 and 42, and this elongated portion forms a convex portion 43a, which will be described later.
It is said that Furthermore, the partition plate 43 has a length that does not reach the upstream end surfaces of the both side wall members 41 and 42, and the upstream portion of the partition plate 43 is
The intake passage section 22A and the second intake passage section 22B merge (branch) into a common intake passage section 22C. That is, both side wall members 41 and 42 on the immediately upstream side of the partition plate 43 are each bulged outward, and this portion constitutes the intake expansion chamber C, that is, the surge tank section 44.
In the upstream side of 4, both side wall members 41 and 42 each have a substantially semicircular cross section, and the overall shape is formed into a substantially cylindrical shape. As a result, the upstream end of the second intake pipe 22 is easily connected to the first intake pipe 21 as the common intake passage 28 by, for example, fitting, while the surge tank portion 44 allows the common intake First intake pipe 2 as passage 28
1 is smoothly distributed to the intake passage portions 22A and 22B within the second intake pipe 22.

The upper surfaces of the surge tank portion 44 and the downstream portion thereof are flat surfaces 44a and 41b, on which characters or the like may be engraved from a design standpoint, or brackets for attaching small items may be engraved thereon. is becoming fixed.

As shown in FIG. 7, the throttle body 23 is fixed to the surge tank 7 using bolts (not shown) with its flange portion 23b seated on the surge tank 7. This throttle body 23 has an interior that is connected to the partition wall 2.
A partition wall 23a forming a part of the air intake passage 5 defines a first intake passage portion 23A and a second intake passage portion 23B. A recess 2 is provided on the rear end surface of the partition wall 23a.
3c is formed, and the partition wall 10 of the surge tank 7
The concave portion 23 with respect to the convex portion 10a formed on the end surface
The throttle body 23 and the surge tank 7 are connected in a predetermined positional relationship by being fitted. In this predetermined connected state, the first intake passage section 23A is communicated with the first intake expansion chamber 11, and the second intake passage section 23B is communicated with the second intake expansion chamber 12. Throttle body 2 like this
3, the first throttle valve 31A is located within the first intake passage portion 23A, and the first throttle valve 31A is located within the second intake passage portion 23A.
A second throttle valve 31B is disposed within 3B. And throttle body 23
A recess 23d is formed in the upstream end surface of the partition wall 23a.

As shown in FIG. 7, the connector 24 is formed into a cylindrical shape by an elastic body and has an elliptical cross section as a whole, and the inside thereof is connected to a partition wall 24a that forms a part of the partition wall 25. Therefore, the first passage section 24
A and a second passage section 24B. The partition wall 24a has a length such that its upstream and downstream ends do not reach the upstream and downstream ends of the connector 24, and the upstream and downstream ends of the connector 24 are connected to the fitting portions 24C and
It is said to be 24D. This upstream fitting part 24C
is fitted to the outer periphery of the downstream end of the second intake pipe 22, and the downstream fitting portion 24D is fitted to the outer periphery of the upstream end of the throttle body 23. As shown in FIG. 8, these fitting and connecting parts are made to be separated by bands 31 and 32, respectively, and the degree of tightening of these bands 31 and 32 is determined by bolts 34 and nuts 35. adjusted.

The partition wall 24a of the connector 24 is formed with a concave portion 24b on its upstream end surface and a convex portion 24c on its downstream end surface. By connecting the connector 24 to the second intake pipe 22, the concave portion 24b is connected to the convex portion 4 of the second intake pipe 22.
3a, while the connector 24
By the connection to the throttle body 23,
The convex portion 24c is the concave portion 23 of the throttle body.
d is fitted slightly tightly. Therefore, the first intake passage part 24A of the connector 24 connects the first intake passage part 22A of the second intake pipe 22 and the first intake passage part 23A of the throttle body 23,
The above-mentioned first intake passage 26 is constituted by the intake passage portions 22A, 24A, and 23A. Similarly, the second intake pipe 22, the connector 24, and the second intake passage portions 22B, 24B, 2 of the throttle body
3B constitutes the second intake passage 27 described above. The connection portion by this connector 24 is connected to the first intake passage 26 and the second intake passage 27 by two concave-convex fittings, that is, a concave-convex fitting between 22b and 24b, and a concave-convex fitting between 23d and 24c. This ensures that the seal between the
A predetermined assembly relationship between the partition wall 24a of the connector 24 and the second intake pipe 22 and the throttle body 23 with respect to both the partition walls 22a and 23b is ensured.

Note that in the embodiment, the outer diameter of the second intake pipe 22 and the outer diameter of the throttle body 23 are different;
The fitting portions 24C and 24D of the connector 24 have inner diameters corresponding to this, so that the connector 24 absorbs this difference in diameter.

Although the embodiment has been described above, the second intake pipe 2
2 can also be made of synthetic resin; in this case, the partition plate 43 is integrally molded with one side wall member 41, 42, and the other side wall member is fused to this integrally molded product. It can also be formed by Of course, the present invention can be similarly applied even if the first intake passage and the second intake passage, which are independent from each other, are configured for purposes other than obtaining a dynamic effect of intake air. .

(Effects of the invention) As is clear from the above, the invention has the following effects:
Since the first intake passage and the second intake passage are configured together in one intake passage,
This is effective in reducing the area occupied in the cross-sectional area of the passage as much as possible, making it easier to handle the passage, and making the engine more compact as a whole.

Moreover, since the inside of the upstream end of the passage member is configured as a confluence part of the first intake passage and the second intake passage, the work of connecting this passage member to the common intake passage upstream from this is easy. , only one connection is required, which is preferable in terms of ease of connection work.

Further, since the intake expansion chamber is provided immediately upstream of the first and second intake passages, the intake air on the upstream side of the first and second intake passages is transferred to the first and second intake passages by the intake expansion chamber. The air can be smoothly distributed to the second intake passage.

Furthermore, since the intake passage is formed by stacking and joining the pair of side wall members and the partition plate, it can be easily assembled.

[Brief explanation of the drawing]

FIG. 1 is an overall system diagram showing an embodiment of the present invention.
FIG. 2 is a perspective view showing an example of a second intake pipe as a passage member. FIG. 3 is a side sectional view of the second intake pipe shown in FIG. 2. FIG. 4 is a perspective view showing the downstream end surface of the second intake pipe shown in FIGS. 2 and 3. FIG. FIG. 5 is a sectional view taken along the line shown in FIG. 3. FIG. 6 is a sectional view taken along the line of FIG. 3. FIG. 7 is a side sectional view showing an example of a passage configuration from the second intake pipe shown in FIGS. 2 and 3 to the surge tank. FIG. 8 is a sectional view taken along the line shown in FIG. 7. C...Intake expansion chamber, E...Engine body, 19
... Passage member, 22... Second intake pipe (divided passage member), 22A... First intake passage section, 22B... Second intake passage section, 25... Partition wall, 26... First intake passage, 27...Second intake passage, 41, 42...
Side wall member, 43... Partition plate (partition wall), 43a...
...Protrusion, 44...Surge tank.

Claims (1)

[Claims for Utility Model Registration] A first intake passage and a second intake passage, which are partially independent of each other, are formed by defining one intake passage with a partition plate; In the passage,
In the engine intake passage structure including a confluence part where both the intake passages are connected on the upstream side of the partition plate, the one intake passage is formed by joining a pair of side wall members facing each other, The partition plate is joined to the pair of side wall members while being sandwiched between the joint parts of the pair of side wall members, and the one intake passage includes the pair of side wall members at a confluence part immediately upstream of the partition plate. An intake passage structure for an engine, characterized in that an intake expansion chamber is formed by bulging the side wall members outward.