JPH0318657Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to an engine intake system that supplies intake supplementary gas such as EGR gas, blow-by gas, and evaporative gas to the engine intake system.

(Prior Art) It is common practice to supply intake supplementary gas such as EGR gas, blow-by gas, and evaporative gas to an engine intake system (see Japanese Patent Laid-Open No. 113042/1983).

By the way, 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, 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) As described above, there are two intake expansion chambers, the first and second, and the intake passages on the upstream side of both the intake expansion chambers are separated from each other by the first and second intake expansion chambers. When configured as two intake passages, the problem is how to supply the above-mentioned intake additional gas to the engine intake system. In particular, the additional intake gas is required to be distributed as evenly as possible to each cylinder, and it is also desired that the intake additional gas introduction path be configured as simply as possible.

Therefore, an object of the present invention is to provide a device having two intake expansion chambers, each of which has an intake passage independently connected to the intake expansion chamber, and which has an extremely simple configuration. An object of the present invention is to provide an intake system for an engine that can distribute additional gas substantially uniformly to each cylinder.

(Means and actions for solving the problems) In order to achieve the above-mentioned object, the present invention has the following configuration. That is, the inside of one surge tank is defined by a partition wall into a first intake expansion chamber connected to one cylinder group and a second intake expansion chamber connected to another cylinder group, and the surge tank has the A dual intake pipe having a first intake passage connected to the first intake expansion chamber and a second intake passage connected to the second intake expansion chamber is connected, and between the mating surfaces of the surge tank and the dual intake pipe, , a first recess connected to the first intake passage and a second recess connected to the second intake passage are formed, an introduction path for intake additional gas is formed in the double intake pipe, and the introduction path is formed. , consisting of one common path, and a first branch path that branches from the downstream end of the common path and connects to the first recess, and a second branch path that connects to the second recess. There is a structure.

With this configuration, by simply connecting the double intake pipe, in which an introduction path for intake additional gas has been formed in advance, to the surge tank, intake air can be added to the most upstream side of each intake expansion chamber in this surge tank. Gas will be introduced, and the intake additional gas will be distributed substantially uniformly to each cylinder via each intake expansion chamber. In addition, the two intake expansion chambers are configured by defining the inside of one surge tank by a partition wall, and the first and second
Since the two intake passages are constructed by dual intake pipes, the overall engine intake system can be made more compact, and the dual intake pipes have two branches for distribution to each intake expansion chamber. Since it is only necessary to form an intake additional gas introduction passage having a passage, the structure of this intake additional gas introduction passage itself becomes extremely simple.

(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 sequence is set to 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 connected, 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 inside of the surge tank 7 is divided into two chambers in the horizontal direction by a partition wall 10 that extends long in the cylinder arrangement direction of each cylinder group A, B, and the side closer to the first cylinder group A is the first chamber. The first intake expansion chamber 11 is for the surge tank 8, while the side closer to the second cylinder group B is the second intake expansion chamber 12 for the second surge tank 9. This first surge tank 8 (first intake expansion chamber 11) is connected to each cylinder 1,
2 and 3 are connected independently. 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.

A dual intake pipe 21 is connected to the surge tank 7. This double intake pipe 21 is shown in FIG.
As shown in FIG. 3, the first intake pipe 22 that is connected to the intake inlet 11a of the first intake expansion chamber 11 and constitutes the first intake passage 22A, and the intake inlet 12a of the second intake expansion chamber 12 are connected to each other. Continuous second intake passage 23A
The upper and lower ends thereof are formed into a connecting flange portion 21a or 21b, respectively.
The opening positional relationship between the intake passages 22A and 23A in the flange portions 21a and 21b is such that on the side of the flange portion 21 at the downstream end, both the intake expansion chambers 1
1 and 12, the direction is approximately horizontal, while the upstream flange portion 21b is directed vertically. That is, in the embodiment, although not shown, the upstream flange portion 21b includes:
The above-mentioned opening position relationship is established because the throttle bodies are connected to each other through two independent intake passages, upper and lower, in which throttle valves are respectively disposed. Then, with the downstream flange portion 21a seated on one end surface of the surge tank 7, that is, one end surface in the longitudinal direction of the partition wall 10, a bolt (not shown) (the insertion opening of this bolt is indicated by reference numeral 27 in FIG. 3) is attached. ) is fixed to the surge tank 7.

As shown in FIGS. 4 to 6, two recesses 24 and 25 are provided on the end surface of the downstream flange portion 21a of the dual intake pipe 21, that is, the mating surface X with respect to the surge tank 7. is formed. Both recesses 24 and 25 are located on both sides of the surge tank 7 with the partition wall 10 in between, that is, the double intake pipe 2
The first recess 24 communicates with the first intake passage 22A, and the second recess 25 communicates with the second intake passage 23A.

The dual intake pipe 21 is further formed with an introduction path 26 for intake additional gas. This introduction route 2
6 is generally Y-shaped in the embodiment, and 1
The common path 26A of books and this common path 26A respectively.
It is composed of two branch paths 26B and 26C, a first branch and a second branch, branched from the downstream end of the branch. The common path 26A is located almost on an extension of the partition wall 10 of the surge tank 7, and its upstream end is connected to a pipe (piping) for introducing additional intake gas (not shown). Accompanied by a double intake pipe 21
A protruding portion 21c for the common path 26A is integrally molded on the. Also, of both branch roads 26B and 26C branched from the common road 26A, the first branch road 26
The downstream end of B is connected to the first recess 24, and the downstream end of the second branch path 26C is connected to the second recess 24.
It is connected to 5.

In addition, in the embodiment, the above-mentioned common path 26A is
Both branch passages 26B and 26C are formed by drilling from the right side in FIG. 5, and by drilling from the end face on the flange portion 21a side.
Further, both the recesses 24 and 25 are respectively connected to the flange portion 2.
It is formed by machining 1a.
Of course, each of the above parts 26A, 26B, 26C, 2
4 and 25 can also be formed at the same time when casting the dual 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.

Further, the intake additional gas supplied to the common path 26A of the introduction path 26 is introduced into the first intake expansion chamber 11 from the first branch path 26B, and this first intake expansion chamber 11
It is then distributed and supplied to each cylinder 1, 2, and 3. In addition, the intake additional gas from the common passage 26A is introduced from the second branch passage 26C through the second recess 25, from the second intake passage 23A to the second intake expansion chamber 12, and from this second intake expansion chamber 12, each It is distributed and supplied to cylinders 4, 5, and 6. In this way, all cylinders 1 to 6
In contrast, the additional intake gas is distributed almost uniformly. In addition, this common road 26A, branch road 2
The lengths of 6B and 26C can be easily set to lengths or diameters that do not affect the resonance effect as described above.

Although the embodiment has been described above, the first recess 24
The second recessed portion 25 can also be formed on the surge tank 7 side (the mating surface with respect to the flange portion 21a). In addition, when a gasket is interposed between the surge tank 7 and the flange portion 21a of the dual intake pipe 21 and the recesses 24 and 25 are formed on the surge tank 7 side, both branch passages 26B are connected to the gasket. , 26C may be opened. Further, the dual intake pipe 21 may be one in which a single passage member is defined by a partition wall into a first intake passage 22A and a second intake passage 23A.

(Effects of the invention) As is clear from the above, the invention has the following effects:
The two intake expansion chambers are constructed by defining one surge tank with a partition wall, while the first and second two intake chambers are constructed on the upstream side of this surge tank.
Since the two mutually independent intake passages are constituted by a double intake pipe having the first and second intake passages, the engine intake system can be made more compact as a whole.

Further, the additional intake gas can be distributed almost uniformly to each cylinder, and the introduction passage for the additional intake gas is configured by forming a passage consisting of a common passage and two branch passages in the dual intake pipe. Since this is done, in combination with the formation of two recesses between the mating surfaces of the surge tank and the double intake pipe, the overall structure can be extremely simple.

[Brief explanation of the drawing]

FIG. 1 is a plan system diagram showing an embodiment of the present invention.
FIG. 2 is a cross-sectional plan view of the main parts of the dual intake pipe. Figure 3 is a right side view of the dual intake pipe in Figure 2. FIG. 4 is a diagram showing the connecting surface of the dual intake pipe to the surge tank. FIG. 5 is a plan sectional view showing an introduction path portion for intake additional gas. FIG. 6 is a side sectional view showing an introduction path portion for intake additional gas. E: Engine body, A: 1st cylinder group, B: 2nd
Cylinder group, X: mating surface, 1 to 6: cylinder, 7: surge tank, 8: first surge tank, 9: second surge tank, 10: partition wall, 11: first intake expansion chamber,
11a: Intake intake port, 12: Second intake expansion chamber, 1
2a: Intake inlet, 13-18: Independent intake pipe, 2
1: Double intake pipe, 21a: Flange part, 21c:
Projection portion, 22: first intake pipe, 22A: first intake passage, 23: second intake pipe, 23A: second intake passage,
24: first recess, 25: second recess, 26: introduction path (for intake additional gas), 26A: common path, 26B:
1st branch road, 26C: 2nd branch road.

Claims (1)

[Claims for Utility Model Registration] The inside of one surge tank is divided by a partition wall into a first intake expansion chamber connected to one cylinder group and a second intake expansion chamber connected to another cylinder group, A dual intake pipe having a first intake passage connected to the first intake expansion chamber and a second intake passage connected to the second intake expansion chamber is connected to the surge tank, and the surge tank and the dual intake pipe A first recess connected to the first intake passage and a second recess connected to the second intake passage are formed between the mating surfaces, and an introduction path for intake additional gas is formed in the double intake pipe. The introduction path is composed of one common path, and a first branch path that branches from the downstream end of the common path and connects to the first recess, and a second branch path that connects to the second recess. An engine intake system characterized by: