JPH0648110Y2 - Engine intake system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an intake system for an engine, which supplies intake additional gas such as EGR gas, blow-by gas, and evaporation gas to an intake system.

(Prior Art) It is generally performed to supply an intake additional gas such as EGR gas, blow-by gas, and evaporative gas to an engine intake system (see Japanese Utility Model Publication No. 61-84164).

By the way, some intake passages of the engine are configured such that the intake system is partially divided into two systems.
That is, in order to obtain resonance supercharging, which is a kind of dynamic effect of intake air, each cylinder is divided into two cylinder groups whose ignition orders are not continuous, and one cylinder group is connected to the first intake passage while the other is connected to the other cylinder group. A second intake passage is communicated with the cylinder group, and the first and second intake passages are independent of each other.

When the intake passage of the engine is divided into two systems in this way, the problem is how to supply the above-mentioned intake additional gas to the engine intake system. In particular, the intake additional gas is required to be uniformly distributed to each cylinder as much as possible, and it is also desired that the introduction path of the intake additional gas can be configured as easily as possible. From such a viewpoint, the one as shown in FIG. 4 is being developed. That is, in such a structure, the intake additional gas is introduced into the extra wall portion 104 of the dual intake pipe 103 in which the first intake passage 101 and the second intake passage 102 are formed.
100 is provided, and intake additional gas is supplied to each intake passage 101, 102.
The distribution passages 105, 106 for distribution into the two were formed by intersecting two drill holes. In the figure,
Reference numeral 107 is a blind plug.

(Problems to be solved by the invention) However, when the intake additional gas introduction passage 100 is formed in the extra portion 104 of the dual intake pipe 103 in this way, the introduction passage 1
When 00 is not appropriate, especially when the lengths of the distribution passages 105 and 106 are not appropriate, the surplus portion 104 of the dual intake pipe 103
There was a problem that the design of the dual intake pipe 103 had to be redone from the beginning, including its size.

Explaining this point in detail, in order to smoothly supply the intake additional gas to the intake system, the distribution passages 105, 1
It is desirable to make the passage system of 06 as large as possible, while the distribution passages 105 and 106 result in the two intake passages 10
This distribution passage is because it connects 1 and 102.
It is necessary to prevent resonance between 105 and 106. That is, if resonance occurs between the distribution passages 105 and 106, it is meaningless to divide the intake passage into two intake systems. Of course, two distribution passages 10 that can meet such demands
It is possible to set the diameter of 5, 106 or the passage length between the distribution passages 105, 106 to a preferable value at the design stage. However, since the resonance phenomenon is a phenomenon that occurs under various factors, for example, when a resonance phenomenon occurs between the distribution passages 105 and 106 due to a change in another element that constitutes the engine, the distribution passage 105, In order to change the design of 106, for example, to increase the passage length between the distribution passages 105 and 106,
For example, the extra thickness 104 of the double intake pipe 103 is increased
The design of 103 had to be changed to avoid the effect on resonance supercharging.

Therefore, an object of the present invention is to provide an intake passage for an engine that can increase the degree of freedom in designing the passage length between distribution passages when avoiding the influence of resonance supercharging.

(Means and Actions for Solving Problems) In order to achieve the above object, the present invention has the following configuration. That is, as a structure in which the intake system obtains resonance supercharging, an intake pipe is provided on the upstream side of a surge tank defined by two chambers, and a partition is provided in the intake pipe to connect to one chamber of the surge tank. One intake passage and a second intake passage communicating with the other chamber of the surge tank are formed, and a common passage as a confluence portion is formed upstream of the first and second intake passages, while the intake pipe is provided. An intake additional gas introducing pipe for supplying the intake additional gas is connected, and a partition wall forms a first distribution passage and a second distribution passage in a connection end portion of the intake additional gas introducing pipe. The first intake passage communicates with the second intake passage.
An intake device for an engine, wherein a distribution passage communicates with the second intake passage, wherein a partition in the intake additional gas introduction pipe is formed by an extension partition extending from the partition in the intake pipe.

With such a configuration, the passage length between the distribution passages for distributing the intake additional gas to the first and second intake passages is determined by the length of the extension partition wall. Therefore, it is possible to avoid the influence on the resonance supercharging only by changing the length of the extension partition wall.

That is, when the intake passage and the intake additional gas passage are integrally formed, the length of the extended partition wall can be adjusted very easily when the mold is changed.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

First, referring to FIG. 2, the intake system of the engine for obtaining the resonance supercharging will be described. Here, the engine body E is a V-type 6-cylinder engine, and the three cylinders 1, 2, A first cylinder group A consisting of three and three cylinders 4,
The second cylinder group B composed of 5 and 6 is arranged so as to form a V shape with each other, and the ignition order of the cylinders 1 to 6 is, for example, 1 → 5 → 3 → 6 → 2 → 4. , The ignition order of the cylinders 1, 2, 3 of the first cylinder group A is not continuous, and similarly, the ignition order of the cylinders 4, 5, 6 of the second cylinder group B is also not continuous. . A surge tank 7 is arranged in the middle of the intake system of the engine body E, and a first intake expansion chamber 8 and a second intake expansion chamber 9 are separated by a partition wall 10 in the surge tank 7. The first intake expansion chamber 8 is connected to each cylinder 1 to 3 of the first cylinder group A via the independent intake pipes 11 to 13, while the second intake expansion chamber 9 is connected to the independent intake pipe 14 Through 16 are connected to the respective cylinders 4 through 6 of the second cylinder group B.

Further, on the upstream side of the surge tank 7, a first intake passage 20 communicating with the first intake expansion chamber 8 and a second intake passage 21 communicating with the second intake expansion chamber 9 are provided. The second intake passages 20 and 21 are partitioned by a partition wall 23 in a dual intake pipe 22. The common passage 24 is formed upstream of the first and second intake passages 20 and 21, and the common passage 24 forms the upstream end of the intake system.

In the intake system of the engine body E as described above, the intake valve
The pressure waves generated by the periodical opening and closing of 31 to 36 are transmitted to the first or second intake expansion chambers 8 and 9, whereby
Vibration is generated in the air column in the first or second intake passages 20, 21. The vibration of the air column in the first or second intake passage 20, 21 again induces pressure wave vibration in the air in the first or second intake expansion chamber 8, 9, and the first intake passage
At the resonance point of the vibration of the air column between 20 and the second intake passage 21,
The pressure vibration in the first or second intake expansion chambers 8 and 9 becomes maximum, and the maximum pressure wave is transmitted to each cylinder 1 to 6. Such a phenomenon is called resonance supercharging, and in order to obtain this resonance supercharging in a predetermined operating region, the passage diameters and passage lengths of the first and second intake passages 20 and 21 are important determining factors. It is said that.

In the intake system of the engine body E described above, in the embodiment, as shown in FIG. 3, the EGR gas is taken in with the surge tank 7, a part of the independent intake pipes 11 to 16, and the dual intake pipe 22. The EGR gas introduction pipe 40 that returns to the system is integrally formed by casting. That is, the ECR gas introduction pipe section 40
Are arranged in parallel with the independent intake pipe 13, and are formed so that their downstream ends are connected to the dual intake pipe portion 22. And EGR
The downstream end of the EGR gas passage 41 in the gas introduction pipe portion 40 is branched into a first distribution passage 42 and a second distribution passage 43, of which the first distribution passage 42 communicates with the first intake passage 20. The second distribution passage 43 is communicated with the second intake passage 21 to distribute the EGR gas.

In this way, the distribution passages 42, 43 for distributing the EGR gas to the first and second intake passages 20, 21 are branched by the partition wall 44, and partition the first and second distribution passages 42, 43. Partition 44
Is formed by immediately extending a partition wall 23 that partitions the first and second intake passages 20 and 21. That is, the partition wall 44 of the first and second distribution passages 42 and 43 is formed by an extended partition wall which is formed by directly extending the partition wall 23 of the first and second intake passages 20 and 21.

In this way, by partitioning the first and second distribution passages 42, 43 by the extension partition 44 of the partition 23 of the first and second intake passages 20, 21, the passage between the distribution passages 42, 43 is divided. The length will be determined by the length 1 of the extension partition 44. Therefore, in the case where the presence of the distribution passages 42, 43 affects the above-described resonance supercharging, it is possible to deal with it only by changing the length 1 of the extension partition wall 44.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and may be, for example, a dual intake pipe 22 and an EGR.
It is needless to say that the present invention can be applied to the case where the gas introduction pipe 40 has a separate structure, and the intake additional gas is not limited to the EGR gas.

(Effect of the Invention) As is clear from the above description, according to the present invention, since the passage length of the distribution passage is determined by the extension partition wall, the distribution passage space can be freely changed only by changing the length of the extension partition wall. You can change the passage length. Of course, this means that the influence avoidance on resonance supercharging can be dealt with only by changing the length of the extension partition wall.

[Brief description of drawings]

FIG. 1 shows a characteristic part of the present invention.
FIG. 2 is a cross-sectional view taken along line I, FIG. 2 is an explanatory view of an intake system of an engine for obtaining resonance supercharging, FIG. It is sectional drawing shown. 20: First intake passage 21: Second intake passage 22: Double intake pipe 23: Partition 41: EGR gas passage 42: First distribution passage 43: Second distribution passage 44: Extended partition A: First cylinder group B: Second cylinder group

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Sayuri Maruyama 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (56) Bibliography Sho 60-69327 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An intake pipe is provided upstream of a surge tank defined by two chambers as a structure for obtaining resonance supercharging in an intake system,
In the intake pipe, a partition wall forms a first intake passage that communicates with one chamber of the surge tank and a second intake passage that communicates with the other chamber of the surge tank.
While forming a common passage as a confluence portion upstream of the second intake passage, an intake additional gas introducing pipe for supplying intake additional gas is connected to the intake pipe, and a partition wall is provided in a connection end portion of the intake additional gas introducing pipe. A first distribution passage and a second distribution passage are formed, the first distribution passage communicates with the first intake passage, and the second distribution passage communicates with the second intake passage. An intake device for an engine, wherein the partition wall in the intake additional gas introduction pipe is formed by an extension partition wall extending from the partition wall in the intake pipe.