JPH10339223A - Manifold and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manifold provided with two pipe-like bodies forming passages and manufacture thereof. SOLUTION: A manifold is provided with a plurality of pipe-like bodies 1 through which air flows. Each pipe-like body 1 has a first plate body 6 having a practically trough-shaped cross section, a second plate body 7 having a practically trough-shaped cross section and intermediate plate body 8 intervening between the first and second plate bodies 6 and 7. Through this constitution, a first passage 60 and a second passage 70 are in parallel with each other. The intermediate plate body 8 is provided with a first branch plate section and a second branch plate section that actually form a Y-shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a manifold. The present invention is applicable to an exhaust manifold and an intake manifold mounted on an internal combustion engine of a vehicle.

[0002]

2. Description of the Related Art A manifold having a plurality of passages communicating with a combustion chamber of an internal combustion engine has conventionally been made of a casting. In addition, a manifold in which a passage is formed by a pipe structure instead of a casting has been recently developed. Further, in order to improve the early warming property of the catalyst, a double-structured manifold having a gap for heat insulation has been developed in recent years.

[0003]

The present applicant is further developing a manifold having a passage formed by the above-mentioned pipe structure. The present invention is a technical advance of the above-described pipe structure manifold, and has at least one tubular body having a bifurcated structure substantially branched into a Y shape,
An object of the present invention is to provide a new type of manifold in which two passages are formed by one tubular body, and a method of manufacturing the manifold.

[0004]

According to a first aspect of the present invention, there is provided a manifold having a tubular body through which an airflow passes, wherein the tubular body extends in a direction of the airflow and has a substantially trough-shaped cross section. With a plate, extending in the direction of air flow and having a substantially gutter shape in cross section,
A second plate joined to the first plate having a gutter inner surface directly or indirectly facing the gutter inner surface of the first plate, and interposed between the first plate and the second plate; An intermediate plate body having a first branch plate portion and a second branch plate portion that are substantially branched into a Y-shape; one surface in the thickness direction of the intermediate plate body; an inner surface of a gutter of the first plate body; Are opposed to each other to form a first passage extending in the airflow passage direction, and the other surface in the thickness direction of the intermediate plate and the gutter inner surface of the second plate are opposed to each other, so that the first passage is A second passage that runs in parallel is formed.

[0005] According to a second aspect of the present invention, in the first aspect, at least one of the first plate and the second plate is provided with an inner plate disposed inside and an outer plate disposed outside the inner plate. And an outer plate, and a gap for heat insulation is formed between the inner plate and the outer plate. A method for manufacturing a manifold according to claim 3, wherein the first plate extends in the airflow passage direction and has a substantially gutter shape, and the second plate extends in the airflow passage direction and has a substantially gutter shape. Preparing an intermediate plate body having a first branch plate portion and a second branch plate portion substantially branched into a Y-shape; and forming a gutter inner surface of the first plate body and a gutter inner surface of the second plate body. At the same time, in a state where an intermediate plate is interposed between the first plate and the second plate, both ends of the first plate and the second plate in the width direction are joined to each other, A first passage extending in the airflow passage direction is formed by facing one surface in the thickness direction of the intermediate plate and the first plate, and the other surface in the thickness direction of the intermediate plate and the second plate are formed. By facing
And a joining step of obtaining a tubular body having a second passage formed in parallel with the first passage.

According to a fourth aspect of the present invention, there is provided a method for manufacturing a manifold.
An intermediate plate having a first plate extending in the airflow passage direction, a second plate extending in the airflow passage direction, and a first branch plate and a second branch plate that are substantially branched into a Y shape. Preparing the first plate and the second plate in a state where the first plate and the second plate are stacked in the thickness direction and an intermediate plate is interposed between the first plate and the second plate; A laminating step of obtaining a structure in which both ends in the width direction of the two-plate body are joined to each other; a liquid material being fed into the inside of the structure; The first passage is formed by enlarging the interval in the thickness direction between the first plate and the body, and the interval in the thickness direction between the second plate and the intermediate plate is enlarged by the hydraulic pressure. A hydraulic forming step of obtaining a tubular body having a second parallel passage formed therein, and a discharging step of discharging a liquid material fed to the structure from the structure. Is shall. According to the manifold according to the first aspect, the first passage extending in the airflow passage direction is formed by the one surface in the thickness direction of the intermediate plate and the inner surface of the gutter of the first plate facing each other.
Furthermore, a second passage parallel to the first passage is formed by the other surface in the thickness direction of the intermediate plate facing the inner surface of the gutter of the second plate.

[0007] The airflow flowing through the manifold passes through the first passage and the second passage. As a typical airflow, when the manifold is an exhaust manifold mounted as an exhaust system component of the internal combustion engine, it is an exhaust gas discharged from the internal combustion engine, and the manifold is mounted as an intake system component of the internal combustion engine. In the case of an intake manifold, it is a mixture of fuel and air supplied to the internal combustion engine.

The first plate, the second plate, and the intermediate plate can be formed of a metal plate such as carbon steel, stainless steel, and aluminum alloy.
In some cases, a plate made of resin may be used. According to the manifold according to the second aspect, at least one of the first plate and the second plate is configured by the inner plate arranged inside and the outer plate arranged outside the inner plate. ing. A gap for heat insulation is formed between the inner plate and the outer plate.
Therefore, the heat insulation property against the airflow passing through the first passage and the second passage is ensured.

According to the third aspect of the present invention, the first passage extending in the airflow passage direction is formed by the one surface of the intermediate plate in the thickness direction facing the first plate. Further, a second passage parallel to the first passage is formed by opposing the other surface of the intermediate plate in the thickness direction and the second plate. Thereby, the manifold according to the first aspect is formed.

According to a fourth aspect of the present invention, in the hydraulic forming step, the liquid material is fed, and the gap between the first plate and the intermediate plate in the thickness direction is adjusted by the hydraulic pressure. The first passage is expanded to form a second passage parallel to the first passage by increasing the distance in the thickness direction between the second plate and the intermediate plate by hydraulic pressure. Thereby, the manifold according to the first aspect is formed. In the hydraulic forming, generally, the forming pressure acts gently on the first plate and the second plate.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a manifold mounted on an internal combustion engine as an exhaust system component of the internal combustion engine will be described below together with a manufacturing method thereof. (Manifold of Embodiment 1) FIG. 1 shows a manifold according to this embodiment. This manifold is mounted on a four-cylinder internal combustion engine as an exhaust manifold.

As can be seen from FIG. 1, this manifold comprises two tubular bodies 1, a mounting flange 3 for holding the upstream end of the tubular body 1 on the side of the internal combustion engine, and a downstream end of the tubular body 1. And a mounting flange 4 for connecting the pipe to a pipe 5 on the catalyst device side. The exhaust gas of the internal combustion engine flows in the direction of arrow M shown in FIG. Each of the tubular bodies 1 has a substantially Y-shaped upstream side, and has a first branch pipe section 11 and a second branch pipe section 12 branched on the internal combustion engine side, that is, an upstream side, and a first branch pipe section 11 and And a collecting pipe section 13 to which the second branch pipe section 12 joins.

As can be understood from FIGS. 7 and 8, in the present embodiment, the first branch plate portion 81 and the second branch plate portion 82 whose distal ends are substantially branched into a Y shape, and the common plate where these merge. The intermediate plate body 8 having the portion 83 is used. This is one of the features of the present embodiment. Each cross section of the above-mentioned tubular body 1 is shown in FIGS. FIG. 2 shows a cross section of the collecting pipe portion 13 of the tubular body 1. FIG. 3 shows a cross section of the downstream side D of the first branch pipe portion 11. FIG. 4 shows the first branch pipe section 1.
1 shows a cross section of the upstream side U of FIG.

As can be understood from FIGS. 2 to 4, each of the tubular bodies 1 according to the present embodiment has a first plate body 6 which is bent substantially in a gutter shape and a substantially gutter-shaped cross section. It comprises a curved second plate 7 and an intermediate plate 8 interposed and fixed between the first plate 6 and the second plate 7. The first plate 6, the second plate 7, and the intermediate plate 8 can be formed of a metal plate such as carbon steel, stainless steel, and aluminum alloy.

As can be understood from FIG. 2, the widthwise end 6r of the first plate 6 and the widthwise end 7r of the second plate 7 are the widthwise end 8r of the intermediate plate 8. And is fixed by welding. Similarly, the width direction end 6s of the first plate 6 and the width direction end 7s of the second plate 7 are fixed together with the width end 8s of the intermediate plate 8 by welding. As a result, as can be understood from FIG.
In this case, the surface 8k, which is one surface in the thickness direction of the intermediate plate body 8, and the gutter inner surface 6p of the gutter-shaped first plate body 6 face each other, thereby forming the first passage 60 extending in the airflow passage direction.

As can be understood from FIG. 2, in the collecting pipe portion 13, the back surface 8h, which is the other surface in the thickness direction of the intermediate plate member 8, faces the gutter inner surface 7p of the gutter-shaped second plate member 7. Thus, a second passage 70 is formed. The first passage 60 and the second passage 70 run parallel to each other independently of each other without communicating with each other. As can be understood from FIG. 2, in the collecting pipe section 13, the first passage 60 and the second passage 70 have a substantially semicircular shape.

In FIG. 2, the first passage 60 and the second passage 70
Are substantially symmetrical with the intermediate plate 8 interposed therebetween. As can be understood from FIG. 3, on the downstream side D of the first branch pipe part 11, the first branch plate part 8 of the intermediate plate body 8 is provided.
The surface 81k which is one surface in the thickness direction of 1 and the gutter inner surface 6p of the first plate body 6 face each other, whereby the first passage 60 having a flat circular cross section is formed.

As can be understood from FIG. 4, on the upstream side U of the first branch pipe portion 11, the portion of the first branch plate portion 81 of the intermediate plate body 8 is bent substantially in a gutter shape in cross section. And a front surface 81 which is one surface in the thickness direction of the first branch plate portion 81.
k and the inner surface 6p of the gutter of the first plate body 6 face each other, whereby a first passage 60 having a substantially circular cross section is formed.

As can be understood from FIG. 3 and FIG.
In the branch pipe part 11, the end 6r of the first plate 6 and the end 81r of the first branch plate 81 of the intermediate plate 8 are fixed by welding, and the end of the first plate 6 is fixed. 6s and the end 81s of the first branch plate portion 81 are fixed by welding. As described above, FIGS. 3 and 4 are diagrams showing one first branch pipe portion 11. 5 and 6 show the other second
FIG. 3 is a view showing a branch pipe section 12. Here, FIG. 5 corresponds to FIG. 3 and shows a cross section of the downstream side D of the second branch pipe portion 12. FIG. 6 corresponds to FIG. 4 and shows a cross section of the upstream side U of the second branch pipe portion 12.

In other words, as can be understood from FIG.
On the downstream side D of the second branch pipe part 12, the back surface 82h, which is one surface in the thickness direction of the second branch plate part 82 of the intermediate plate body 8, and the gutter inner surface 7p of the second plate body 7 face each other. A flat circular second passage 70 is formed. As can be understood from FIG. 6, on the upstream side U of the second branch pipe section 12, the second branch plate section 82 of the intermediate plate body 8 is substantially bent into a trough-shaped section, and the second branch plate section is formed. A back surface 82h, which is another surface in the thickness direction of 82, and a gutter inner surface 7p of the second plate body 7 face each other, whereby the second passage 70 having a substantially circular cross section is formed.
Are formed.

As can be understood from FIGS. 5 and 6, the second
In the branch pipe section 12, the end 7r of the second plate 7 and the intermediate plate 8
The end 82r of the second branch plate 82 is fixed by welding, and the end 7s of the second plate 7 and the second branch plate 82
82s are fixed by welding. (Manufacturing process) The manufacturing process of the tubular body 1 according to the first embodiment will be described. The tubular body 1 may be manufactured through press molding or may be manufactured through hydraulic molding.

First, a process of manufacturing the tubular body 1 through press forming will be described. First, as shown in FIG. 7, a first plate body 6, a second plate body 7, and an intermediate plate body 8 extending along the air flow passage direction are prepared. The first plate 6 is press-formed into a substantially gutter-shaped cross-section so as to include a gutter inner surface 6p that defines the gutter groove 6po. The second plate 7 is formed by press molding into a substantially gutter-shaped cross-section so as to include a gutter inner surface 7p that defines the gutter groove 7po.

As described above, the intermediate plate body 8 is formed of a common plate portion where the branched first branch plate portion 81 and the second branch plate portion 82 join with the first branch plate portion 81 and the second branch plate portion 82. 83 and are substantially Y-shaped. Next, as can be understood from FIG. 2, the inner surface 6p of the gutter of the first plate 6 and the inner surface 7p of the gutter of the second plate 7 are opposed to each other, and the opposed first plate 6 and the second plate 7 are connected to each other. An intermediate plate body 8 is interposed between them. In this state, the end 6r in the width direction of the first plate 6 is
The end 7r in the width direction of the plate 7 and the end 8r of the intermediate plate 8
And welded together.

The end 6s in the width direction of the first plate 6 and the end 7s in the width direction of the second plate 7 are connected to the end 8s of the intermediate plate 8.
Weld with s. Thereby, one tubular body 1 having the above-described structure is formed. The two tubular bodies 1 thus formed are connected to each other by welding together with the mounting flanges 3 and 4 to obtain the manifold according to the first embodiment. Next, a process of manufacturing the tubular body 1 by using hydraulic forming will be described with reference to FIG. That is, as shown in FIG. 8, the first plate body 6, the second plate body 7, and the intermediate plate body 8 extending along the air flow passage direction are prepared by punching with a press punching machine.

The first plate body 6 shown in FIG. 8 has a flat shape extending from one end to the other end in the longitudinal direction, instead of a gutter shape at the punching stage. Second plate body 7 shown in FIG.
Has a flat plate shape extending from one end to the other end in the longitudinal direction, not the cross-section gutter shape at the punching stage. FIG.
The intermediate plate body 8 includes a first branch plate portion 81 and a second branch plate portion 82 that are branched, and a common plate portion 83 where the first branch plate portion 81 and the second branch plate portion 82 join. Substantially Y
It has a flat shape at the punching stage as described above.

Next, as can be understood from FIG. 9A, with the intermediate plate 8 interposed between the first plate 6 and the second plate 7, the first plate 6 and the second plate The plate 7 is laminated in the thickness direction. Further, the end 6r in the width direction of the first plate 6 and the second plate 7
Is welded together with the end 8r of the intermediate plate 8, and the width end 6s of the first plate 6 and the width end 7s of the second plate 7 are connected to the intermediate plate 8 Is welded together with the end portion 8s to obtain the structure W.

In the above-described structure W, as can be understood from FIG. 9B, the end 6r of the first plate 6 and the end 81r of the first branch plate 81 are welded, and The end 6s of the one plate 6 and the end 81s of the first branch plate 81 are welded. Further, as can be understood from FIG. 9C, the end 7r of the second plate 7 and the end 82r of the second branch plate 82 are welded, and the end 7s of the second plate 7 is Second
The end 82s of the branch plate 82 is welded.

Next, as can be understood from FIG. 10, the structure W is set in the molding cavity 80 of the mold 8 and the supply plug 83 is inserted into the non-welded portion of the structure W. In this state, a liquid material L such as water or hydraulic oil is pressed into the structure W from the supply source 86 such as a pump via the supply hole 84 of the supply plug 83. As the liquid pressure of the liquid L increases, the first plate 6 and the second plate 7 are bulged. As a result, the distance in the thickness direction between the first plate 6 and the intermediate plate 8 is increased, and the first passage 60 is formed. Similarly, the second
The gap in the thickness direction between the plate body 7 and the intermediate plate body 8 is enlarged, and the second passage 70 is formed.

If the liquid material L is press-fitted so that the first passage 60 and the second passage 70 have substantially the same pressure, the deformation of the intermediate plate 8 can be suppressed. Thereafter, the liquid L is discharged from the structure W. Thereby, one tubular body 1 is formed.
The two tubular bodies 1 formed in this manner are used and connected by welding together with the mounting flanges 3 and 4 to obtain the manifold according to the first embodiment.

(Effect of Embodiment 1) As can be understood from the above description, according to the manifold of Embodiment 1, 1
A manifold having a novel pipe structure in which two parallel first passages 60 and second passages 70 are formed by the tubular body 1 can be provided. That is, one tubular body 1 can discharge exhaust gas for two cylinders of the internal combustion engine. Such a manifold is advantageous for reducing the installation space.

It is said that a dual exhaust system in which a plurality of exhaust passages independently run in parallel is advantageous for ensuring the output of an internal combustion engine. According to this point, according to the present embodiment, two first passages 60 and second passages 70 running in parallel by one tubular body 1 can be formed, which is advantageous for adoption of the dual exhaust system, and the output of the internal combustion engine is improved. It is advantageous for securing. (Manifold of Embodiment 2) Next, Embodiment 2 will be described with reference to FIGS. The manifold according to the second embodiment has basically the same configuration as the manifold according to the first embodiment, and has substantially the same operation and effect. Therefore, the parts having the same function are denoted by the same reference numerals.

However, the tubular body 1 according to the second embodiment has a double pipe structure. That is, as can be understood from FIG.
The plate body 6 includes a first inner plate 65 disposed inside and a first outer plate 66 disposed outside the first inner plate 65. A first gap 67 for heat insulation is formed between the first inner plate 65 and the first outer plate 66. Similarly, as can be understood from FIG. 11, the second plate 7 includes a second inner plate 75 disposed inside and a second outer plate 76 disposed outside the second inner plate 75. ing. A second gap 77 for heat insulation is formed between the second inner plate 75 and the second outer plate 76. In FIG. 11, the first passage 60 and the second passage 70 are symmetrical with the intermediate plate 8 interposed therebetween.

According to the above-described manifold of the second embodiment, the heat insulating effect of the first gap 67 and the second gap 77 allows the tubular body 1 to have a heat insulating property against the airflow passing through the first passage 60 and the second passage 70. Is secured. Therefore, when the present invention is applied to an exhaust manifold, the heat insulation of exhaust gas passing through the first passage 60 and the second passage 70 of the tubular body 1 is ensured. Therefore, it is advantageous to secure the initial warm-up property for the catalyst device. Therefore, it is advantageous to ensure the purification efficiency of the catalyst device.

The tubular body 1 according to the second embodiment having the above-described double-pipe structure may be formed through press molding, or may be formed through hydraulic molding, as in the first embodiment. May be. In the case of manufacturing through press molding, as can be understood from FIG. 12, a gutter-shaped first inner plate 65 and a gutter-shaped first outer plate 66 constituting the first plate body 6 are prepared. Similarly, a gutter-shaped second inner plate 7 constituting the second plate body 7
5 and a gutter-shaped second outer plate 76 are prepared.

Here, as can be understood from FIG.
The inner plate 65 and the first outer plate 66 are substantially bent into a gutter shape by press molding. Second inner plate 75, second outer plate 7
Similarly, 6 is bent into a substantially gutter shape by press molding. Then, the first inner plate 65, the first outer plate 66, the intermediate plate body 8, the second inner plate 75, and the second outer plate 76 are overlapped, and their widthwise ends are welded, similar to the first embodiment. To
One tubular body 1 is formed.

In the case where the tubular body 1 having the double pipe structure is formed by hydroforming, the first body is formed as shown in FIG.
The plate-shaped first inner plate 65 and the plate-shaped first
The outer plate 66 and the flat second inner plate 7 constituting the second plate 7
5 and a second flat plate 76 are prepared together with the intermediate plate 8. The first inner plate 65 and the first outer plate 66 shown in FIG. 13 are not in a gutter shape but in a flat plate shape. Similarly, the second inner plate 75 and the second outer plate 76 shown in FIG. 13 are also flat.

Next, the first inner plate 65, the first outer plate 66, the intermediate plate 8, the second inner plate 75, and the second outer plate 76 are laminated, and their widthwise ends are welded to form a structure. To form Next, a liquid material is press-fitted into the structure, and the gap in the thickness direction between the first inner plate 65 and the intermediate plate 8 is enlarged by the liquid pressure to form the first passage 60. Similarly, the distance in the thickness direction between the second inner plate 75 and the intermediate plate body 8 is increased, and the second passage 70 running parallel to the first passage 60 is formed.

As can be understood from FIG. 11, the distance between the first inner plate 65 and the first outer plate 66 in the thickness direction is increased by hydraulic pressure to form the first gap 67 for heat insulation.
The gap in the thickness direction between the second inner plate 75 and the second outer plate 76 is enlarged to form the second gap 77 for heat insulation. (Other Embodiments) In the above-described embodiment, the entire length of the intermediate plate portion 8 is substantially the same as the entire length of the first plate member 6 and the entire length of the second plate member 7. Therefore, as can be understood from FIG. The downstream end 8e of the plate portion 8 is set at a position corresponding to the downstream end 6e of the first plate 6 or the downstream end 7e of the second plate 7, but is not limited to this, and may be another one shown in FIG. As in the embodiment, the total length of the intermediate plate 8 is set shorter than the total length of the first plate 6 and the total length of the second plate 7, and the downstream end 8 e of the intermediate plate 8 is connected to the first plate 6. The downstream end 6e and the downstream end 7e of the second plate 7 may be set on the upstream side. In this case, the downstream side of the first passage 60 and the downstream side of the second passage 70 communicate with each other.

The manifold according to each of the above embodiments is applied to a four-cylinder internal combustion engine, but is not limited to this, and may be a manifold applied to an internal combustion engine having another number of cylinders. In addition, the present invention is not limited to only the embodiments described above and shown in the drawings, but can be implemented with appropriate modifications without departing from the scope of the invention.

[0040]

According to the first aspect of the present invention, it is possible to provide a manifold having a novel pipe structure in which two parallel passages are formed by one tubular body. In such a manifold, two parallel running paths can be formed by one tubular body, which is advantageous in reducing the installation space. According to the second aspect, in addition to the above, a tubular body having a double-pipe structure having a gap for heat insulation can be formed. Therefore, the heat insulating property against the airflow passing through the first passage and the second passage of the tubular body is secured. Therefore, when applied to an exhaust manifold, heat insulation for exhaust gas passing through the first passage and the second passage of the tubular body is ensured. Therefore, it is advantageous to secure the initial warm-up property for the catalyst device.

Incidentally, in the catalyst device, in order to secure the purification efficiency of the exhaust gas from the initial stage, it is required to raise the temperature of the catalyst device early. According to claims 3 and 4, the manifold according to claim 1 can be provided. In particular, if the first plate and the second plate having substantially a trough-shaped cross section are used, a tubular body can be formed without requiring special equipment.

According to the fourth aspect of the present invention, since the molding pressure based on the hydraulic pressure acts gently on the first plate and the second plate, it is possible to reduce local stress concentration at the time of molding. This is advantageous for avoidance and improves the moldability.

[Brief description of the drawings]

FIG. 1 is a perspective view of a manifold in a use state.

FIG. 2 is a sectional view of a collecting pipe portion of the tubular body.

FIG. 3 is a cross-sectional view of the first branch pipe portion of the tubular body on the downstream side.

FIG. 4 is a cross-sectional view of an upstream side of a first branch pipe portion of the tubular body.

FIG. 5 is a cross-sectional view of the second branch pipe portion of the tubular body on the downstream side.

FIG. 6 is a sectional view of an upstream side of a second branch pipe portion of the tubular body.

FIG. 7 is a perspective view schematically showing a state in which a first plate, a second plate, and an intermediate plate bent by press molding are juxtaposed.

FIG. 8 is a perspective view schematically showing a state in which a first plate, an intermediate plate, and a second plate to be subjected to hydroforming are juxtaposed.

FIG. 9 is a sectional view of a laminate for hydroforming.

FIG. 10 is a sectional view schematically showing a process of hydroforming.

FIG. 11 is a sectional view of a tubular body according to a second embodiment.

FIG. 12 is a perspective view schematically showing a state in which a first plate, a second plate, and an intermediate plate bent by press molding are juxtaposed in forming a tubular body according to Embodiment 2.

FIG. 13 is a perspective view schematically showing a state in which a first plate, a second plate, and an intermediate plate to be hydraulically formed are juxtaposed in forming a tubular body according to the second embodiment.

FIG. 14 is a perspective view schematically showing a state in which a first plate, a second plate, and an intermediate plate forming a tubular body according to another embodiment are juxtaposed.

[Explanation of symbols]

In the figure, 1 is a tubular body, 6 is a first plate, 7 is a second plate, 8 is an intermediate plate, 8k is a front surface, 8h is a back surface, 81 is a first branch plate portion, and 82 is a second branch plate. Part, 83 is the common plate part, 60 is the first plate part
A passage, 70 is a second passage, 65 is a first inner plate, 66 is a first outer plate, 67 is a first gap, 75 is a second inner plate, 76 is a second outer plate, and 77 is a second gap.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F01N 7/10 F01N 7/10 F02M 35/10 102N

Claims (4)

[Claims] 1. A manifold having a tubular body through which an air flow passes, wherein said tubular body extends in an air flow passage direction and has a substantially trough-shaped cross section; A second plate joined to the first plate, having a gutter inner surface directly or indirectly facing the gutter inner surface of the first plate, and the first plate An intermediate plate having a first branch plate portion and a second branch plate portion interposed between the second plate member and substantially branching into a Y-shape; The first surface extending in the airflow passage direction by the one surface in the thickness direction facing the inner surface of the gutter of the first plate body.
A second passage parallel to the first passage is formed by the passage being formed, and the other surface in the thickness direction of the intermediate plate facing the inner surface of the gutter of the second plate. A manifold characterized by being. 2. An apparatus according to claim 1, wherein at least one of said first plate and said second plate is provided with an inner plate disposed inside and an outer plate disposed outside said inner plate. And a gap for heat insulation is formed between the inner plate and the outer plate. 3. A first plate extending in the airflow passage direction and having a substantially gutter-shaped cross section, a second plate extending in the airflow passage direction and having a substantially gutter-shaped cross section, and substantially Y-shaped. Preparing an intermediate plate body having a first branch plate portion and a second branch plate portion branched into: a gutter inner surface of the first plate body and a gutter inner surface of the second plate body, In a state where an intermediate plate is interposed between the first plate and the second plate, both ends in the width direction of the first plate and the second plate are joined to each other, A first passage extending in an airflow passage direction is formed by facing one surface in the thickness direction of the intermediate plate and the first plate, and the other surface in the thickness direction of the intermediate plate is By facing the second plate, a tubular body having a second passage parallel to the first passage is formed. Method for manufacturing a manifold which comprises a bonding step that. 4. An intermediate member comprising a first plate extending in the air flow direction, a second plate extending in the air flow direction, and a first branch plate portion and a second branch plate portion branched substantially in a Y-shape. A step of preparing a plate, and overlapping the first plate and the second plate in the thickness direction and interposing the intermediate plate between the first plate and the second plate. In the state, a laminating step of obtaining a structure in which both ends in the width direction of the first plate body and the second plate body are joined to each other, and a liquid material is fed into the structure, and a hydraulic pressure is applied. In the structure, a first passage is formed by enlarging a gap in a thickness direction between the first plate and the intermediate plate in the structure, and the second plate and the intermediate plate are formed by hydraulic pressure. A hydraulic forming step of obtaining a tubular body in which a second passage parallel to the first passage is formed by enlarging an interval in a thickness direction between the first and second passages; Method for manufacturing a manifold which comprises a discharge step of discharging a liquid material which is fed to the structure from the structure.