JPH0141902Y2 - - Google Patents

Description

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

(Prior Art) Some engine intake passages are configured at least partially as two mutually independent intake passages: a first intake passage and a second intake passage. In other words, for example, when obtaining resonance supercharging, which is a type of dynamic effect of intake air, the
As shown in Publication No. 2892, each cylinder of the first cylinder group whose ignition order is not consecutive to each other is independently set to the first cylinder group.
While connected to a surge tank (first intake expansion chamber), each cylinder of the second cylinder group whose ignition order is not consecutive to each other is independently connected to the second surge tank, and both surge tanks are connected to the first and second surge tanks. The first and second intake passages are connected to the third surge tank through two 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.

In addition, it is often required that the first and second intake passages are divided in the middle due to their length, but in this case, a The common method of connecting and fixing the flange portions together using bolts and nuts also causes the problem that the connection work becomes extremely difficult.

Therefore, an object of the present invention is to reduce the area occupied in the cross-sectional area of two mutually independent intake passages to make them as compact as possible, while also making it as compact as possible in the case of a split configuration. An object of the present invention is to provide an engine intake passage structure in which the connection work can be easily performed.

(Means and actions for solving the problem) In order to achieve the above-mentioned object, the present invention basically defines the inside of one passage member by a partition wall. A first intake passage and a second intake passage are configured within one 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 transparent as possible.

Further, since one passage member having the first intake passage and the second intake passage is obtained by connecting two divided passage members, this connection is made by a partition wall provided inside. This is done using a connector made of a cylindrical elastic body having two intake passages. That is, by fitting each end of this connector to the outer periphery of both divided passage members, one of the intake passages in both divided passage members can be connected to each other through one intake passage of this connector, and The other intake passage sections in both the divided passage members are connected to each other via the other intake passage section. Moreover, in this case, at the same time, in order to improve the sealing performance, a fitting part is formed in the connector made of an elastic body, and the outer periphery of the end of the divided passage member is fitted into the fitting part.

Furthermore, in order to facilitate the circumferential positioning of the split passage member relative to the connector and facilitate the connection work between the connector and the split passage member, the fitting portion of the connector is made non-circular in cross section, and the fitting portion is At least the outer periphery of the end portion of the divided passage member to be fitted is non-circular to correspond to the fitting portion of the connector.

In order to reliably define the space between the first intake passage and the second intake passage at the connection portion, the partition walls of the connector and both of the divided passage members are fitted in a concave-convex manner in the connection direction. be.

Specifically, the configuration is as follows. That is, in an engine intake passage structure including a first intake passage and a second intake passage that are independent of each other, by defining the inside of one passage member by a partition wall, the first intake passage and the second intake passage are configured, the passage member is divided in the middle, and the divided divided passage members are connected to each other by a cylindrical connector made of an elastic body; In the connector, fitting portions are formed at both ends of the connector by partition walls that are retracted inward from both ends of the connector, and two intake passages are defined between the fitting portions. The outer periphery of the divided passage member is fitted into each fitting portion of the connector, and the two divided passage members are connected to each other through one of the two intake passage portions of the connector. The intake passages on one side of the
Further, the other intake passage portions in the two divided passage members are connected independently to each other via the other intake passage portion of the connector, the fitting portion of the connector has a non-circular cross section, and the fitting portion At least the outer periphery of the end portion of the split passage member to be fitted into the joint portion is non-circular in correspondence with the fitting portion of the connector, and the partition wall of the connector and the partition walls of both the split passage members are uneven in the connection direction. There is an engine intake passage structure characterized by being fitted.

(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, forming 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. The cylinders 1, 2, and 3 of the first cylinder group A are 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.
Sequentially from the 0 side, the first intake pipe 21, the 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
A partition wall 25 shown by a broken line in FIG. 1 forms a first intake passage 26 and a second intake passage 27 which are independent from each other.
The first intake passage 26 is independently connected to the first surge tank 8 (first intake expansion chamber 11), and the second intake passage 27 is connected to the second surge tank 9 (second intake expansion chamber 12). ing. The first intake pipe 21 connects both intake passages 2 to the air cleaner 20 from the upper end of the second intake pipe 22.
There is one common intake passage connected to both Nos. 6 and 27.

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,
As shown in FIGS. 2 and 3, the cross section is generally circular, and the partition wall 25 is provided inside the section.
A partition wall 22a that constitutes a part of is formed. As a result, inside the second intake pipe 22, the partition wall 2
2a defines two intake passages, a first intake passage 22A and a second intake passage 22B. The partition wall 22a is connected to the second intake pipe 22.
A plate-like convex portion 22b extending over almost the entire width is bored in the downstream end surface. Further, the upstream end of the partition wall 22a is connected to the second
The length is such that it does not reach the upstream end of the second intake pipe 22, so that the upstream end of the second intake pipe 22 is
This is a branching part (merging part) between the two intake passages 22A and 22B. Note that the second intake pipe 22 as shown in FIGS. 2 and 3 is an integrally molded product, for example, by casting aluminum.

As shown in FIG. 4, 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. 4, the connector 24 is formed into a cylindrical shape by an elastic body and has a circular cross section as a whole, and the inside thereof is connected to a partition wall 24a forming a part of the partition wall. Therefore, the first intake passage section 24
A and a second intake passage section 24B.
This partition wall 24a has its upstream and downstream ends connected to the connector 2.
The length does 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 parts 24, respectively.
C, 24D. This upstream fitting part 2
4C is tightly fitted to the outer periphery of the downstream end of the second intake pipe 22, and the downstream fitting part 24D is tightly fitted to the outer periphery of the upstream end of the throttle body 23. As shown in FIG.
This band 32,
The degree of tightening of 33 is adjusted by bolts 34 and nuts 35.

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 recess 24b is connected to the convex part 2 of the first intake pipe 22.
2b, while the connector 24
By the connection to the throttle body 23,
The convex portion 24c is the throttle body concave portion 23d.
It fits snugly. 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, and the first intake passage part 22A, By 24A and 23A,
The first intake passage 26 described above is configured. Similarly, the second intake pipe 22, the connector 24, and each second intake passage section 22B, 24B, 23 of the throttle body
B constitutes the second intake passage 27 described above. The connection portion by this connector 24 has two concave and convex fittings, that is, 22b and 24b.
By the uneven fitting between 23d and 24c, and the uneven fitting between 23d and 24c, sealing between the first intake passage 26 and the second intake passage 27 is reliably performed, and the partition wall 24a of the connector 24 is A predetermined assembly relationship between the second intake pipe 22 and the throttle body 23 with respect to both the partition walls 22a and 23a 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.

FIG. 6 shows another example of the second intake pipe 22, which is constructed by integrating plate shapes divided into three in the cross-sectional area direction.
That is, as shown in FIGS. 7 to 9, a pair of side wall members 41 and 42 each having a curved cross section by press molding are opposed to each other, and a gap is formed between them 41 and 42. With the partition plate 43 as a partition wall sandwiched between these three people 4.
1, 42, and 43 are welded together. Note that this welding is performed on both side wall members 41.
However, since the connector 24 is fitted to the outer periphery of the downstream end of the flange portions 41a and 42a,
It is assumed that a and 42a do not exist. In this way, one side wall member 41 and the partition plate 43 allow the first intake passage portion 44A, which forms a part of the first intake passage 26 described above, to be connected to the other side wall member 41.
2 and the partition plate 43 constitute a second intake passage portion 44B that forms a part of the second intake passage 27 described above. Of course, a protrusion 443a for fitting into the partition wall 24a of the connector 24 is formed on the downstream end surface of the partition plate 43.

Although the embodiments have been described above, the partition wall 22
The concavo-convex fitting portions in a, 23a, and 24a can be formed by forming a convex portion on one arbitrary partition wall and a concave portion on the other partition wall. Further, both of the divided passage members connected by the connector 24 are connected to the second intake pipe 2
It is also possible to use a simple tubular member without the throttle valves 31A and 31B as in No. 2. 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 a purpose 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 a single passage member, the area occupied in the cross-sectional area of the passage is minimized, making it easier to handle the passage and making the engine as a whole more compact. It is effective in promoting

Further, when the passage member is divided into parts and the divided passage members are connected to each other, a single piece made of an elastic body is used.
This can be done by mating using two connectors, that is, the mating work can be performed in two places, such as mating between one divided passage member and the connector, and fitting between the other divided passage member and the connector. Therefore, since the first intake passages can be connected to each other and the second intake passages can be connected to each other at the same time, this connection work is also extremely easy. Moreover, in this case, a fitting part is formed in the connector made of an elastic body, and the outer periphery of the end of the split passage member is fitted into the fitting part, so that the two can be tightly fitted, and the connector and Sealing performance with the divided passage member can be improved.

Furthermore, the cross section of the fitting portion of the connector is non-circular, and at least the outer periphery of the end portion of the split passage member that is fitted into the fitting portion is non-circular corresponding to the fitting portion of the connector. The operator can visually perform the fitting operation between the connector and the divided passage member, and the fitting operation immediately positions the divided passage member relative to the connector in the circumferential direction. , it is possible to further facilitate the connection work between the connector and the split passage member.

Furthermore, since the partition wall of the elastic connector and the partition wall of both divided passage members are fitted with concave and convex surfaces in the connection direction, misalignment and seal leakage at the partition wall portions are prevented. , it is possible to reliably define the first intake passage and the second intake passage at the portion connecting the two divided passage members.

Furthermore, by means of a connector made of an elastic body,
It is possible to absorb the difference in natural vibration between the downstream side (engine body side) and upstream side (vehicle body side) of the divided passage member, and furthermore, the difference in the outer diameter of both divided passage members can be absorbed by the connector. This is extremely effective in practice, as it also makes it possible to

[Brief explanation of drawings]

FIG. 1 is an overall system diagram showing an embodiment of the present invention.
FIG. 2 is a side sectional view showing an example of a second intake pipe as a divided passage member. FIG. 3 is a perspective view of the downstream end side of FIG. 2. FIG. 4 is a sectional view showing a state in which the second intake pipe and the throttle body, each serving as a divided passage member, are connected by a connector. FIG. 5 is a sectional view taken along the line shown in FIG. 4. FIG. 6 is a side sectional view showing a modification of the second intake pipe as a divided passage member. FIG. 7 is a sectional view taken along the line of FIG. 6. FIG. 8 is a sectional view taken along the line of FIG. 6. FIG. 9 is a sectional view taken along the line -- in FIG. 6. E: Engine body, 19: Passage member, 22: Second intake pipe (divided passage member), 22a: Partition wall, 2
2b: Convex portion, 22A: First intake passage portion, 22B:
2nd intake passage portion, 23: Throttle body (divided passage member), 23a: Partition wall, 23d: Recess, 2
3A: first intake passage section, 23B: second intake passage section, 24: connector, 24a: partition wall, 24b:
Recessed portion, 24c: Convex portion, 24A: First intake passage portion,
24B: second intake passage section, 26: first intake passage,
27: second intake passage, 43: partition plate (partition wall),
43a: Convex portion, 44A: First intake passage portion, 44
B: Second intake passage section.

Claims (1)

[Claims for Utility Model Registration] In an engine intake passage structure that includes a first intake passage and a second intake passage that are independent of each other, the interior of one passage member is defined by a partition wall. The first intake passage and the second intake passage are configured in one passage member, and the passage member is divided in the middle, and the divided divided passage members form a cylindrical connector made of an elastic body. The connector is configured such that fitting portions are formed at both ends of the connector by partition walls that are retracted inward from both ends of the connector, and two intake passages are formed between the fitting portions. The outer periphery of the divided passage member is fitted into each fitting part of the connector, and the outer periphery of the divided passage member is fitted into each fitting part of the connector, so that the outer circumference of the divided passage member is fitted through one of the two intake passage parts of the connector. so that one of the intake passages in the two divided passage members is connected to each other,
Further, the other intake passage portions in the two divided passage members are connected independently to each other via the other intake passage portion of the connector, the fitting portion of the connector has a non-circular cross section, and the fitting portion At least the outer periphery of the end portion of the split passage member to be fitted into the joint portion is non-circular in correspondence with the fitting portion of the connector, and the partition wall of the connector and the partition walls of both the split passage members are uneven in the connection direction. An engine intake passage structure characterized by being fitted.