JPH0326299Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of an engine intake device.

(Prior art) In recent years, some engine intake systems have been equipped with a first surge tank that is connected independently to each cylinder in a cylinder group in order to improve the filling efficiency due to dynamic effects of intake air, such as resonance supercharging. , a second surge tank connected to each cylinder in the other cylinder group individually and independently, and an intake passage upstream of both surge tanks connected to a first surge tank connected to the first surge tank.
Some systems are separated into two systems: an intake passage and a second intake passage connected to the second surge tank.
Of course, the firing orders of the cylinders in one cylinder group are not adjacent to each other, and the firing orders of the cylinders in other cylinder groups are also not adjacent to each other (see Japanese Patent Publication No. 57-2892).

By the way, for the engine intake system,
Although it is common practice to introduce additional intake gas such as EGR gas, blow-by gas, and evaporative gas, it is desirable to distribute this additional intake gas to each cylinder as evenly as possible. It is conceivable that introduction passages for intake additional gas are connected to both the first surge tank and the second surge tank individually.

(Problems to be solved by the invention) As mentioned above, when connecting the intake additional gas introduction passages to the two surge tanks individually,
In order to use only one control valve for controlling the introduction, it is strongly desired that the upstream sides of the two introduction passages be merged at least at the control valve portion.

However, in order to avoid adversely affecting the dynamic effect of intake air due to the merging of two introduction passages, each introduction passage must be made narrow and long. Therefore, how to arrange these two introduction passages becomes a problem from the viewpoint of space.

Therefore, the purpose of the present invention is based on the assumption that the intake passages upstream of the two surge tanks are separated into two systems, the first intake passage and the second intake passage.
To provide an intake device for an engine which can arrange an introduction passage without requiring a large space when intake supplementary gas is separately introduced into both surge tanks from two introduction passages.

(Means and effects for solving the problem) In order to achieve the above-mentioned object, in the present invention, both the first and second intake passages are designed by taking into consideration that both the first and second intake passages are quite long. This was done by focusing on the fact that when the intake passages are arranged side by side, a considerable amount of effective space is created around them, and both introduction passages for intake additional gas are placed along both of the intake passages arranged side by side. It is arranged like this. Specifically, a first surge tank for one cylinder group and a second surge tank for another cylinder group are provided, and an intake passage upstream of both surge tanks is connected to the first surge tank. In an engine intake system separated into two systems, a passage and a second intake passage connected to the second surge tank, the first and second intake passages extend in the same direction from the corresponding surge tank. The intake additional gas introduction passage is configured as two separate systems: a first introduction passage connected to the first surge tank and a second introduction passage connected to the second surge tank; Both the first and second introduction passages are arranged along both the first and second intake passages.

(Example) An example of the present invention will be described below based on the attached drawings.

In FIG. 1, 1 is one cylinder group, 2 is another cylinder group, and both cylinder groups 1 and 2 form a V-shape with each other, and each has three cylinders arranged in series in a direction perpendicular to the plane of the paper. It is a component of a V-type 6-cylinder engine. The firing orders of the cylinders in one cylinder group 1 are not adjacent to each other, and accordingly, the firing orders of the cylinders in the other cylinder group 2 are also non-adjacent. In other words, the ignition order is one cylinder in cylinder group 1, one cylinder in cylinder group 2, one cylinder in cylinder group 1, etc.
It is set like this.

A surge tank 3 is disposed above the space A between both cylinder groups 1 and 2, that is, the central space of the V bank, and extends in the cylinder arrangement direction of the cylinder groups 1 and 2 (direction perpendicular to the plane of the paper in Figure 1). There is. This surge tank 3
The interior of this chamber is an intake expansion chamber B, and three connection ports 4 or 5 are opened in series on the left and right sides of the chamber B, respectively, as shown in FIG. As shown in FIG. 2, the intake expansion chamber B is divided into two chambers, a right ventricle B1 and a left ventricle B2, by a partition wall 3a extending vertically within the surge tank 3. Surge tank 3 is right ventricular B
1 and the left ventricle B2.
The second surge tank 3B is used as two surge tanks. The connection port 4 opened to the right chamber B1 is connected to one cylinder group 1.
The intake ports 6 of the cylinder heads H1 provided for each cylinder of this one cylinder group 1 are connected via independent intake pipes 7, respectively. Furthermore, the connection port 5 opened to the left chamber B2 is for the other cylinder group 2, and is connected to the intake port 8 of the cylinder head H2 provided individually for each cylinder of the other cylinder group 2. They are connected via an independent intake pipe 9. Of course, the passages from the connection ports 4 and 5 to the intake ports 6 and 8 via the independent intake pipes 7 and 9 constitute an independent intake passage.

The intake ports 6 and 8 in both cylinder groups 1 and 2 are
Each of them opens toward the other cylinder group, that is, toward the V-bank central space A, while the independent intake pipes 7 and 9 once extend away from the side of the surge tank 3 and then are bent back approximately 180 degrees. hand,
Thereafter, it passes under the surge tank 3, that is, it is inclined so as to cross the V bank central space A from side to side, and is connected to the intake port 6 or 8. The independent intake pipes 7 and 9 are made sufficiently long to produce an inertial supercharging effect.

In addition, in the embodiment, the independent intake pipe 7 includes a substantially U-shaped first branch pipe 7a connected to the connection port 4 of the surge tank 3, and a first branch pipe 7a and the intake port 6 connected to the first branch pipe 7a.
A gently curved second branch pipe 7b connecting the
The second branch pipe 7b is located below the surge tank 3. Similarly to the branch pipe 7, the branch pipe 8 also includes a substantially U-shaped first branch pipe 9a, and a gently curved second branch pipe 9b connecting the first branch pipe 9a and the intake port 8. ,
This second branch pipe 9b is located below the surge tank 3. In other words, both second
The branch pipes 7b and 9b are crossed with each other below the surge tank 3, and the second branch pipes 7b and 9b, which are crossed in this way, are integrally formed by casting or the like. That is,
Three second branch pipes 7b and three second branch pipes 9b
and are integrally molded. Also, 3
The first branch pipes 7a and the three first branch pipes 9a are also integrally molded, as shown in FIG. 2.

The surge tank 3 has an intake inlet 10 opened to the right ventricle B1 and an intake inlet 11 opened to the left ventricle B2 on the right end surface in FIG.
A double intake pipe 12 connected to an air cleaner (not shown) is connected to this right end surface. This double intake pipe 12 is connected to the intake inlet 10 and has a first
A first intake pipe 13 constituting an intake passage 13A, and a second intake passage 14A connected to the intake inlet 11.
The upstream side of the intake pipe is integrally molded with the second intake pipe 14 constituting the intake pipe 14, and the upstream side thereof is separated into two systems with a predetermined length secured through a two-way throttle body (not shown). , common 1 from the middle
It is used as the book's intake passage and is connected to the air cleaner. In this way, by introducing intake air into the left ventricle B1 and right ventricle B2 of the intake expansion chamber B from mutually independent intake pipes 13 and 14, so-called resonance supercharging can also be obtained. .

The second branch pipes 7b, 9b have intake ports 6, 8 adjacent to the cylinder groups 1, 2, respectively.
A fuel injection port 1 that extends almost vertically and opens at
6, 17 are formed, and these fuel injection ports 16, 17
The lower end portions of the fuel injection valves 18 and 19, that is, the fuel injection nozzle portions are fitted and connected to the respective fuel injection valves 18 and 19, respectively. In this way, the three fuel injection valves 18 for one cylinder group 1 and the three fuel injection valves 19 for the other cylinder group 2 are located at positions widely separated laterally within the V-bank central space A. However, for the three fuel injection valves 18 and 19 on each side, fuel destroyers 20 and 21 are installed.
Fuel is becoming more distributed and distributed.

A plurality of pedestals 22 are integrally molded at intervals in the cylinder arrangement direction on the side wall portion of the branch pipe 7b or 9b, which is integrally molded as described above. Both of the pedestals 22 have flat upper surfaces, on which the left and right center portions of the bottom wall of the surge tank 3 are placed. On the other hand, surge tank 3
A boss portion 3b is formed on the partition wall 3a corresponding to the position of the pedestal 22 and extends downwardly over the entire vertical length of the surge tank 3 by making the diameter slightly larger. A bolt insertion hole 23 is formed in each. This bolt insertion hole 23
is opened at its upper end, while its lower end is opened at the bottom of the surge tank, and the mounting bolt 24 is inserted into this bolt insertion hole 23 and screwed into a screw hole 25 formed in the base 22. , the surge tank 3 is firmly fixed to the engine body side.

On the bottom of the surge tank 3, there are marks shown in FIGS.
As shown in the figure, the intake additional gas (in the example
A passage member 31 for (EGR gas) is connected.
The passage member 31 is located directly below the dual intake pipe 12, that is, the two intake pipes 13 and 14, and extends in the same direction as the dual intake pipe 12.
At the tip of this passage member 31, that is, at the farthest position from the surge tank 3, there is one
An EGR valve 32 is arranged. Inside this passage member 31, there is one common introduction passage 33 which has a short portion immediately downstream of the EGR valve 32, and from this common introduction passage 33, surge tanks 3 and 3 are connected in parallel to each other.
It is branched into a first introduction passage 34 and a second introduction passage 35 which are long and extend toward each other. The downstream ends of both the introduction passages 34 and 35 have outlet ports 34a and 35a.
Therefore, the outlet 34a is connected to the first surge tank 3.
Inlet port 3 for intake additional gas opened on the bottom surface of A
6, and the outflow port 35a is connected to an inlet 37 opened on the lower surface of the first surge tank 3B. Of course, both the inlets 36 and 37 are formed as close to the upstream side of the surge tanks 3A and 3B as possible, that is, in the vicinity of the intake inlets 10 and 11, in order to distribute the intake additional gas to each cylinder well. Further, the inlet ports 36 and 37 are formed to protrude slightly toward the axial direction of the intake inlet port 10 or 11. Note that the passage member 31 described above is fixed to the bottom surface of the surge tank 3 and the bottom surface of the dual intake pipe 12 with bolts (not shown).

With the above configuration, EGR gas as intake additional gas is passed through one EGR pipe 38 extending from the exhaust passage under the control of the EG valve 32.
After passing through the common introduction passage 33, the flow is divided and flows through both the first and second introduction passages 34, 35, and is distributed and supplied to the surge tanks 3A, 3B from the introduction ports 36, 37, and then to each cylinder. It will be distributed almost evenly.

4 and 5 show a second embodiment of the present invention, and the same components as in the previous embodiment are given the same reference numerals and their explanations are omitted. The same applies to examples).

In this embodiment, one passage member 41 allows
In addition to forming two long intake passages 13A and 14A for intake and one short common passage 42 in which the upstream ends of both intake passages 13A and 14A are connected to each other, the above-mentioned intake additional gas Introductory passages 33, 34, and 35 are formed therein. And each passage 13A, 14A, 33, 34
Each outflow port of the is made to face upward, and the intake air is also
It is designed to be supplied from the bottom of the surge tank 3 (3A or 3B). In addition, 4 in Figure 4
3 is (the bottom surface of) the surge tank 3 of the passage member 41
This is the insertion hole for the mounting bolt.

FIGS. 6 and 7 show examples of the present invention applied to an in-line six-cylinder engine. That is, in this embodiment, the first and second surge tanks 3
A and 3B are formed separately from each other, and are arranged in series with each other in the longitudinal direction so as to extend in the engine crankshaft direction as a whole. Also, both surge tanks 3A and 3B
A third surge tank 3C is installed for
This third surge tank 3C and first surge tank 3
A is connected to the first intake pipe 13 that constitutes the first intake passage 13A, and also to the third surge tank 3C and the second
The surge tank 3B is connected to the second intake pipe 14, which constitutes a second intake passage 14A and is parallel to the first intake pipe 13. For this third surge tank 3C, a common intake passage 51A
A common intake pipe 51 constituting the two is connected. Note that both the first and second surge tanks 3A, 3B and each cylinder are individually and independently connected to each other via an independent intake pipe 7 or 9, respectively.

On the other hand, the introduction passage for EGR gas as intake additional gas is a common introduction pipe 5 along the side surfaces of the first and second surge tanks 3A and 3B of the third surge tank 3C.
2, and a first introduction passage 13A extending from the upstream end of the common introduction pipe 52 and connected to the first surge tank 3A.
and a second introduction pipe 54 as a second introduction passage 14A extending from the downstream end of the common introduction pipe 52 and connected to the second surge tank 3B. At the end, EGR
A valve 32 is connected.

The introduction pipes 52, 53, and 54 are located directly below both intake pipes 13 and 14, respectively, with the first introduction pipe 53 extending parallel to the first intake pipe 13, and the second introduction pipe 53 extending parallel to the first intake pipe 13.
The introduction pipe 54 extends parallel to the second intake pipe 14.

(Effects of the invention) As is clear from the above, the invention has the following effects:
The introduction passage for the intake additional gas, which is required to be long, is effectively utilized in the space formed around the two intake passages, which are located upstream of the two surge tanks and are quite long. This arrangement is extremely effective in making the engine as a whole more compact.

[Brief explanation of the drawing]

Figures 1 to 3 show the first embodiment of the present invention. Figure 1 is a cross-sectional front view of the main part of a V-type engine. Figure 2 is a front view of the surge tank shown in Figure 1. A plan sectional view, and FIG. 3 is a side sectional view of FIG. 2. 4 and 5 show a second embodiment of the present invention, FIG. 4 is a partially sectional plan view of the main part, and FIG.
Side view of the figure. 6 and 7 show a third embodiment of the present invention, FIG. 6 is a partially sectional perspective view of the main part,
FIG. 7 is a partially sectional side view of FIG. 6, looking at the two surge tanks from the first and second intake passage sides. 1: One cylinder group, 2: Other cylinder group, 3: Surge tank, 3A: First surge tank, 3B: Second surge tank, 3C: Third surge tank, 4, 5:
Connection port, 7, 9: Independent intake pipe, 10, 11:
Intake intake port, 12: dual intake pipe, 13: first intake pipe, 13A: first intake passage, 14: second intake pipe,
14A: Second intake passage, 31: Passage member, 32:
EGR valve, 33: Common introduction passage, 34: First
Introduction passage, 35: Second introduction passage, 36, 37: Introduction port, 38: EGR pipe, 41: Passage member, 4
2: common passage, 51: common intake pipe, 52: common introduction pipe, 53: first introduction pipe, 54: second introduction pipe.

Claims (1)

[Claims for Utility Model Registration] A first surge tank for one cylinder group and a second surge tank for another cylinder group, and an intake passage upstream of both surge tanks is connected to the first surge tank. In an engine intake system separated into two systems, a first intake passage and a second intake passage connected to the second surge tank, both the first and second intake passages are connected to the corresponding surge tank in the same manner as each other. The intake additional gas introduction passage is separated into two systems: a first introduction passage connected to the first surge tank and a second introduction passage connected to the second surge tank. An intake system for an engine, wherein the first and second introduction passages are arranged along both the first and second intake passages.