JPH0988745A - Air suction device of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency of an engine by reducing inflow resistance of intake air and E.G.R gas flowing into a collector and uniformly distributing these intake air and E.G.R gas to each of independent air suction passages. SOLUTION: An umbrella shaped body 11 is provided with its head part directed toward the upstream side of a collector 6 on an end part of an introduction pipe 10 in the collector 6. An introduction port of E.G.R gas to the inside of the collector 6 is opened and formed on a side of the umbrella shaped body 11 or a side of the introduction pipe 10 or on a lower surface of the umbrella shaped body 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine intake system, and more particularly to a system for introducing exhaust gas recirculation gas into an intake system (EG.
R) Intake device.

[0002]

2. Description of the Related Art In an intake system for a multi-cylinder engine, conventionally, as shown in FIGS. 7 and 8, each cylinder 1A, 1B of the multi-cylinder engine is provided in order to make the independent intake passages communicating with each cylinder have the same length. , 1C, 1D, the upstream end ports 2a, 3 of the plurality of independent intake passages 2, 3, 4, 5 respectively.
a, 4a, 5a are assembled in a state where they are close to each other and connected to a collector 6, a common intake passage (throttle chamber) 7 is connected to the upstream side of this collector 6, and an exhaust gas recirculation gas (hereinafter referred to as E. In order to recirculate G.R. G. As shown in FIG. 8, the introduction port 8a of the R gas introduction pipe 8 is provided in the collector 6, and the center is surrounded by the upstream end ports 2a, 3a, 4a, 5a of the respective independent intake passages 2, 3, 4, 5 as described above. There is a device which is located at and is opened toward the upstream side of the intake system (for example, Japanese Patent Laid-Open No. 4-246271).

[0003]

As in the conventional structure described above, the E. G. In the case where the introduction port 8a of the R gas introduction pipe 8 is formed by simply cutting the pipe in the radial direction and opened toward the upstream side of the intake system, the intake air flow A is Gas flow B flowing out of the introduction port 8a of the introduction pipe 8
Head-on collision facing E. G. It may hinder the introduction of R gas, and the E. G. There is a first problem that R gas cannot be satisfactorily refluxed.

Also, for the intake air flow, there is a second problem that the intake resistance due to the gas flow B becomes large and the intake efficiency is reduced, so that the engine efficiency is reduced. Further, as described above, the intake air flow is E. G. A head-on collision with the flow of R gas may disturb the intake air flow, and the intake air may not be evenly distributed to the independent intake pipes in the collector, which causes a third problem of reducing engine efficiency.

Further, as shown in FIG. 9, the intake air flow collides with a flat plate-shaped collector-constituting wall 6a formed between the upstream end ports 2a, 3a, 4a, 5a of the independent intake passages 2, 3, 4, 5. However, there is a fourth problem that the flow resistance becomes large, the flow of the intake air is obstructed, the uniformity of distribution to the independent intake passages is deteriorated, and the engine efficiency is reduced.

Therefore, the present invention is based on the E. G. It is an object of the present invention to provide an intake system for an engine that introduces R gas, which can solve each of the above problems.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to each upstream side end portion of a plurality of independent intake passages which communicate with each cylinder of a multi-cylinder engine. Are connected to a collector, and an introduction pipe for introducing the exhaust gas recirculation gas into the collector is provided in the central portion between the collecting portions of the upstream side end portions so as to be directed to the upstream side of the collector. ) Is provided with a flow diverting means (9) for preventing the intake air flow and the exhaust gas recirculation gas flow from colliding with each other.

In the present invention, since the intake air flow and the exhaust gas recirculation gas flow do not face each other in the collector (6) by the flow diverting means (9), the intake air and the E. G. R
The inflow resistance of both of the gases is reduced compared to the conventional one that collides head-on, and both of them smoothly flow into each independent intake passage (2-
5), and both are evenly distributed to the independent intake passages.

According to the second aspect of the present invention, the upstream side end portions of the plurality of independent intake passages that communicate with the respective cylinders of the multi-cylinder engine are collected and connected to the collector, and the upstream side end portions are connected to each other. In the center part of which an introduction pipe for introducing the exhaust gas recirculation gas into the collector is provided so as to be directed to the upstream side of the collector, the end portion of the introduction pipe (10) is opened, and
The umbrella-shaped body (11) is provided with a gap between it and the opening.

In the present invention, the intake air flowing in the central portion of the collector (6) as shown by the arrow A is supplied with the umbrella-shaped body (1).
1) Each upstream end port (2) of each independent intake passage (2-5)
a to 5a) are diverted to the side where they are arranged. In addition, E.
G. R gas is collected from the lower surface of the umbrella-shaped body (11) to the collector (6).
Introduced within. Therefore, the same effect as that of claim 1 can be exerted.

According to a third aspect of the present invention, the upstream side end portions of the plurality of independent intake passages communicating with the respective cylinders of the multi-cylinder engine are collected and connected to the collector, and the upstream side end portions are connected to each other. In the center portion of the inlet pipe for introducing the exhaust gas recirculation gas into the collector so as to be directed to the upstream side of the collector, the end portion of the inlet pipe (10) is closed by the umbrella-like body (11), and the collector ( 6) The introduction port (13) is formed in the introduction pipe (10) inside.

In the present invention, the intake air is the umbrella-shaped body (1
1) and the E. G. The R gas is introduced laterally from the inlet port (13) formed in the inlet pipe (10) and exhibits the same action as in claim 1, and the inlet port (13) is connected to each of the independent intake passages (2 to 2). 5) by arranging and forming it toward the upstream end ports (2a to 5a). G. R gas can be evenly distributed to each independent intake passage (2 to 5).

According to a fourth aspect of the present invention, the upstream side end portions of the plurality of independent intake passages communicating with the respective cylinders of the multi-cylinder engine are collected and connected to the collector, and the upstream side end portions are connected between the collecting portions. In the central part of the pipe, an introduction pipe for introducing the exhaust gas recirculation gas into the collector is provided so as to be directed to the upstream side of the collector, and an umbrella-shaped body (11) is provided at the end of the introduction pipe (10). In the body (11), an introduction passage (15) having one end communicating with the end of the introduction pipe (10) and the other end opening to a surface other than the top of the umbrella-like body (11) is formed. To do.

In the present invention, the intake air is the umbrella-shaped body (1
1) and the E. G. The R gas flows out laterally from the side surface of the umbrella-shaped body (11), and exhibits the same effect as that of claim 3.

According to a fifth aspect of the present invention, the upstream side end portions of the plurality of independent intake passages communicating with the respective cylinders of the multi-cylinder engine are collected and connected to the collector, and the upstream side end portions are connected to each other. In the central part of the pipe, an introduction pipe for introducing the exhaust gas recirculation gas into the collector is provided so as to be directed to the upstream side of the collector, and an umbrella-shaped body (11) is provided at the end of the introduction pipe (10). An introduction passage having one end communicating with the end portion of the introduction tube (10) and the other end inclined toward the surface of the umbrella-shaped body and opening to the lower surface of the umbrella-shaped body (11) in the body (11). (18) is formed.

In the present invention, when the intake air is the umbrella-shaped body (1
1) and the E. G. The R gas flows out through the introduction path (18) in the same direction as the flow direction of the intake air flowing on the surface of the umbrella-shaped body. Therefore, in addition to the effect similar to that of claim 3, the intake air and the E. G. Disturbance of both flows of R gas is extremely small, and the distributability is further improved.

The invention according to claim 6 is the bottom diameter (R ₁ ) of the umbrella-like body (11) according to any one of claims 2 to 5.
Is larger than the outer diameter of the introduction pipe (10) and has a length that covers the collector-constituting wall (6a) between the upstream end openings of the individual intake passages, and the surface of the umbrella-shaped body (11) is It is characterized in that it is inclined toward the center of the upstream end ports (2a to 5a) in each independent intake passage.

In the present invention, the intake air flowing through the central portion of the collector (6) is formed by the umbrella-shaped body so that the collector-constituting wall (6a) between the upstream end ports (2a-4a) of each independent intake passage.
It is split without hitting. Therefore, the inflow resistance of intake air can be reduced. Further, the divided intake air flows toward the center of the upstream end ports (2a-4a). Therefore, the distribution of the intake air to the independent intake passages is favorably performed. In particular, E.I. G. In the case where the R gas introduction path (18) is formed along the inclined surface of the umbrella-shaped body (11),
The E. G. R gas is ejected toward the center of each of the upstream end openings (2a to 4a). Therefore, E. G. The R gas is uniformly distributed well.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention shown in FIGS. 1 and 2 will be described. Reference numeral 6 denotes a collector, which has the same function as that described with reference to FIGS. That is, on the downstream side of the collector 6, as shown in FIG. 7, the upstream end ports 2a of the independent intake passages 2, 3, 4, 5 communicating with the cylinders 1A to 1D of the engine 1, respectively.
As shown in FIG. 2, 3a, 4a, and 5a are closely assembled and connected in an array state centering on a corner of a square, and the upstream side is connected to a common intake passage (throttle chamber) 7. .

10 is E. G. The R gas introduction pipe is located at the center of the constituent wall 6a on the downstream side of the collector 6, that is, at the center between the collecting portions of the upstream end ports 2a to 5a in the independent intake passages 2 to 5, It is provided so as to penetrate inward, and the axial center of the introduction pipe 10 is provided so as to project toward the upstream side of the collector 6.

Reference numeral 11 denotes a conical umbrella-shaped body, which is the above-mentioned introduction pipe 10.
Is fixed to the end of the collector 6, that is, at the tip into the collector 6, with the tip side facing the upstream side of the collector 6. Next, an example of the flow diverting means 9 using the above-mentioned umbrella-shaped body will be described.

FIG. 3 shows a first embodiment in which the end portion of the introduction pipe 10 is opened, and the umbrella-shaped body 11 is coaxially attached to the end portion of the introduction pipe 10 without closing the introduction port 10a. Is. The umbrella-shaped body 11 is held by a support bar 12 such as an umbrella bone.

As shown in FIG. 1, the inclined surface 11a of the umbrella-shaped body 11 has an extension line extending from each of the independent intake passages 2, 3, 3.
Central points O of the upstream end ports 2a, 3a, 4a, 5a of 4,5
Alternatively, it is set to an inclination angle α toward the vicinity thereof. Moreover, the skirt diameter R ₁ is larger than the outer diameter of the introduction pipe 10, and
The upstream end ports 2a, 3a of each independent intake passage 2, 3, 4, 5
Flat plate-shaped collector-constituting wall 6a formed between 4a and 5a
The diameter R ₂ is substantially the same as the diameter R ₂ .

In the first embodiment, the E. G. The R gas is deflected by the back surface of the umbrella-shaped body 11 and flows as shown by an arrow C, and flows from the introduction port 10b toward the downstream side of the collector 6. Further, the intake air flowing near the center of the collector 6 as indicated by the arrow A is E. G. R
The gas flows as described above so that the E. G. Inclined surface 11a of umbrella 11 without frontal collision with R gas
Flows in the direction of arrow D and is branched to the side of the entire circumference of the umbrella-shaped body 11.

Therefore, the intake air is E. G. The R gas flows smoothly without being affected by the intake resistance, and the upstream end ports 2a, 3a of the independent intake passages 2, 3, 4, 5 are
It is evenly distributed to 4a and 5a. In addition, E. G. The R gas is not subject to the introduction resistance due to the flow of the intake air, but rather is introduced into the collector by the intake air flow and is evenly distributed to the upstream end ports of the independent intake passages 2, 3, 4, and 5. .

At this time, the sloped surface 11a of the umbrella-shaped body 11 has the upstream end ports 2a, 3 of the respective independent intake passages 2, 3, 4, 5.
Since it is inclined toward the center of a, 4a, 5a, the uniformity of the distribution and distribution of intake air to the independent intake passages 2, 3, 4, 5 is further improved. Further, since the hem diameter of the umbrella-shaped body 11 is formed to be large as described above, the intake air does not hit the flat plate-shaped collector-constituting wall 6a, so that the flow resistance of the intake air flow can be reduced and the intake air can be reduced. Uniformity of air distribution and distribution is further improved.

FIG. 4 shows a second embodiment of the present invention, in which a solid umbrella-shaped body 11 is coaxially fixed to the end portion of the above-mentioned introduction pipe 10 to introduce the introduction pipe 10.
Is closed, and an introduction port 13 is formed in a portion of the introduction pipe 10 located directly below the umbrella-shaped body 11 and inside the collector 6. A plurality of the inlets 13 are formed at equal intervals in the circumferential direction of the inlet pipe 10. For example, in the case of having four independent intake passages 2, 3, 4, 5, their upstream end ports 2a, 3a, Four pieces are formed in the directions of 4a and 5a. The inclination angle and outer diameter of the umbrella-shaped body 11 are the same as above.

In the second embodiment, the E. G. The R gas flows out from the four inlets 13 as indicated by arrow E. Further, the intake air is E. G.
The R gas flows out as described above, so that the E. G. R
The front surface of the umbrella-shaped body 11 is diverted as shown by an arrow D without causing a head-on collision with the gas.

Therefore, also in the second embodiment, the intake air and the E. G. The R gas is distributed in the same manner as in the first embodiment, but in particular, the introduction ports 13 are provided on the side where the upstream end ports 2a, 3a, 4a, 5a of the independent intake passages 2, 3, 4, 5 are located. By placing it in the E. G. It becomes more reliable to evenly distribute the R gas to the independent intake passages 2, 3, 4, and 5.

FIG. 5 shows a third embodiment in which the introduction pipe 10 is
In the middle, only the end is opened without forming an introduction port, and the umbrella-like body 11 is coaxially fixed to the end of the introduction pipe 10.
The introduction tube 10 is located in the center of the umbrella-shaped body 11.
A first introduction path 14 communicating with the first introduction path 14 and a second introduction path 15 branched from the first introduction path 14 in four directions are formed in a T-shape, and E.
G. The R gas inlet 16 is provided with the inclined surface 11a of the umbrella-shaped body 11.
It is open to. When the inlet 16 has, for example, four independent intake passages 2, 3, 4, and 5, four inlets 16 are formed in that direction. The inclination angle and outer diameter of the umbrella-shaped body 11 are the same as above.

In the third embodiment, the E. G. The R gas passes through the first introduction passage 14 and is equally divided in four directions by the four second introduction passages 15, and flows out from the outlet 16 to the side orthogonal to the intake direction A of the intake air as shown by an arrow F. To do. Further, the intake air is E. G. The R gas flows out as described above, so that the E. G. Inclined surface 11a of umbrella 11 without frontal collision with R gas
Is divided as indicated by arrow D. In addition, the intake air is the inlet 1
6 flows out along the inclined surface of the umbrella-shaped body 11, so that the E. G. Introduction of R gas into the collector is facilitated.

Therefore, also in the third embodiment, the intake air and the E. G. The R gas is divided and distributed as in the first and second embodiments. FIG. 6 shows a fourth embodiment, in which the introduction pipe 10 is opened only at the end portion without forming an introduction port in the middle thereof, and the umbrella-shaped body 11 is coaxially fixed to the end portion of the introduction pipe 10. A first introduction passage 17 located in the center of the umbrella-like body 11 and communicating with the introduction pipe 10, and the first introduction passage 1
Second inclined from the inner end side of 7 in the descending inclination of the inclined surface 11a of the umbrella-shaped body 11 and branched in four directions close to the inclined surface 11a.
And the introduction path 18 to form an E. G. The R gas inlet 19 is formed in the outer peripheral portion of the lower surface of the umbrella-shaped body 11. The inlet 19 is, for example, four independent intake passages 2, 3, 4, 5
In case of having four, four are formed in that direction. still,
The inclination angle and outer diameter of the umbrella-shaped body 11 are the same as above.

In the fourth embodiment, the E. G. The R gas passes through the first introduction passage 17 and is evenly divided into four directions by the four second introduction passages 18, and from the introduction port 19 at the same inclination angle as the inclination angle of the outer surface 11 a of the umbrella-shaped body 11 in the collector. Is introduced as indicated by arrow G. Also,
The intake air is E. G. The R gas flows out as described above, so that the E. G. The inclined surface 11a of the umbrella-shaped body 11 is diverted as shown by an arrow D without colliding head-on with the R gas.

Therefore, also in the fourth embodiment, the intake air and the E. G. The R gas is dispersed and distributed in the same manner as in the first embodiment, but particularly in the fourth embodiment, it has the following effects.

The flow directions D and E. G. Since the R gas derivation direction G is the same direction, the two rarely disturb the flow of the other. Further, by increasing the hem diameter R ₁ of the umbrella-shaped body 11 as shown in FIG. G. Each inlet port 19 for R gas is connected to each upstream end port 2a, 3a, 4 of each independent intake passage 2, 3, 4, 5.
a, 5a and evenly distributed in the umbrella-shaped body 11. G. Each upstream end port 2 of R gas by its distribution amount
a, 3a, 4a, 5a to be introduced further improved,
E. FIG. G. Even distribution of R gas is enhanced.

[0036]

As described above, according to the present invention, the intake air flowing into the collector and the E.
G. The R gases do not collide with each other, the inflow resistance of both is reduced, both flow smoothly into each independent intake passage, and are evenly distributed, and engine efficiency is improved.

Also in the invention described in claim 2, the same effect as in claim 1 can be exhibited. According to the inventions of claims 3 and 4, each E. G. By locating the respective R gas inlets on the respective independent intake passage sides, the E. G. Even distribution of R gas to each independent intake passage is more favorably performed.

According to the invention described in claim 5, E.
G. The R gas is evenly distributed even better. Claim 6
According to the invention described above, the inflow resistance of the intake air is further reduced, and the intake air and the E.C. G. Even distribution of R gas to each independent intake passage can be further improved, and engine efficiency can be further improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX in FIG.

3A and 3B show a first embodiment of the introduction tube with an umbrella-shaped body of the present invention, where FIG. 3A is a vertical sectional view and FIG. 3B is a bottom view of FIG.

4A and 4B show a second embodiment of the introduction pipe with an umbrella-shaped body of the present invention, wherein FIG. 4A is a vertical sectional view and FIG. 4B is a bottom view of FIG. 4A.

FIG. 5 is a vertical cross-sectional view showing a third embodiment of the introduction tube with an umbrella-shaped body of the present invention.

6A and 6B show a fourth embodiment of the introduction pipe with an umbrella-shaped body of the present invention, where FIG. 6A is a vertical sectional view and FIG. 6B is a bottom view of FIG.

FIG. 7 shows a collector part to which the present invention is applied,
The figure shows a conventional structure.

8 is an enlarged cross-sectional view taken along line YY in FIG.

FIG. 9 is a sectional view of a collector portion showing a conventional structure.

[Explanation of symbols]

 2a to 4a Upstream end port of independent intake passage 9 Flow diverting means 10 E. G. FIG. R gas introduction pipe 11 Umbrella 10a, 13, 16, 19 E. G. FIG. R gas inlet 15,18 Inlet path

Claims (6)

[Claims] 1. An exhaust gas recirculation system in which a plurality of independent intake passages communicating with each cylinder of a multi-cylinder engine are connected to a collector by gathering upstream end portions of the plurality of independent intake passages. In a configuration in which an introduction pipe for introducing gas into the collector is provided upstream of the collector, a flow diverting means is provided in the collector for preventing the intake air flow and the exhaust gas recirculation gas flow from colliding with each other. And the intake system of the engine. 2. Exhaust gas recirculation in a central portion between the collecting portions of the upstream side end portions of the plurality of independent intake passages that communicate with the respective cylinders of the multi-cylinder engine and are connected to a collector. In an arrangement in which an introducing pipe for introducing gas into the collector is provided so as to be directed to the upstream side of the collector, an end portion of the introducing pipe is opened, and an umbrella-like body is provided at the end portion with a gap between the opening and the opening. An air intake device for an engine, characterized by being provided with. 3. The exhaust gas recirculation in a central portion between the collecting portions of the upstream side end portions of the plurality of independent intake passages, which communicate with the respective cylinders of the multi-cylinder engine, is connected to a collector. In the case where the introduction pipe for introducing the gas into the collector was provided so as to be directed to the upstream side of the collector, the end portion of the introduction pipe was closed with an umbrella-shaped body, and the introduction port was formed in the introduction pipe portion inside the collector. Characteristic engine intake device. 4. The exhaust gas recirculation in a central portion between the collecting portions of the respective upstream side end portions of the plurality of independent intake passages that communicate with the respective cylinders of the multi-cylinder engine and are connected to a collector. In a case where an introduction pipe for introducing gas into the collector is provided so as to be directed to the upstream side of the collector, an umbrella-like body is provided at an end of the introduction pipe, and one end communicates with the end of the introduction pipe within the umbrella-like body. The intake device for an engine is characterized in that the other end of the umbrella-shaped body is formed with an introduction path that opens to a surface other than the top. 5. The exhaust gas recirculation at a central portion between the collecting portions of the respective upstream side end portions of the plurality of independent intake passages communicating with the respective cylinders of the multi-cylinder engine is connected to a collector. In a case where an introduction pipe for introducing gas into the collector is provided so as to be directed to the upstream side of the collector, an umbrella-like body is provided at an end of the introduction pipe, and one end communicates with the end of the introduction pipe within the umbrella-like body. The intake device for an engine is characterized in that the other end portion is inclined along the inclination of the surface of the umbrella-shaped body to form an introduction path opening to the lower surface of the umbrella-shaped body. 6. The hem diameter of the umbrella-shaped body according to claim 2 is larger than the outer diameter of the introduction pipe, and covers the collector constituent wall between the upstream end ports of the independent intake passages. An intake device for an engine, wherein the intake device is formed to have a length, and the surface of the umbrella-shaped body is further inclined toward the center of the upstream end opening in each independent intake passage.