JP2001033187A - EGR gas cooling device - Google Patents

Abstract

(57) Abstract: The present invention relates to an EGR gas cooling device for cooling EGR gas recirculated from an exhaust system to an intake manifold via an EGR pipe, and is supported at a predetermined position in an outer cylinder. The purpose is to easily and securely fix the board. SOLUTION: A support plate 29 into which a plurality of pipe members 19 are inserted is arranged in an outer cylinder 11, and a projection 33 is formed on the outer cylinder 11 so as to project inward.
3 is characterized in that the outer peripheral portion of the support plate 29 is supported.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an EGR system for an exhaust system.
The present invention relates to an EGR gas cooling device for cooling EGR gas recirculated to an intake manifold via a pipe.

[0002]

2. Description of the Related Art Conventionally, in an engine, in order to reduce nitrogen oxides (NOx) in the exhaust gas, a part of the exhaust gas is taken out of an exhaust system and added to an air-fuel mixture.
(Exhaust Gas Recirculation). An EGR device for performing such EGR includes:
Part of the exhaust gas from the exhaust system is recirculated as EGR gas to the air-fuel mixture sucked into the combustion chamber.

In such an EGR device, the EG
Since R gas is taken into the combustion chamber together with the air-fuel mixture, EG
It is necessary to maintain the temperature of the R gas at an appropriate temperature. In other words, the EGR gas is naturally high in temperature, but if the temperature of the EGR gas is too high, the air-fuel mixture is heated and thermally expanded, so that the air charging efficiency is deteriorated and the combustion rate of the air-fuel mixture is deteriorated. The output of the engine may be reduced.

On the other hand, if the temperature of the EGR gas is too low,
The viscosity of the adhering substance such as tar in the GR gas increases, so that the adhering substance easily adheres to the EGR passage, the EGR valve, and the like, which may reduce the reliability of the apparatus.

Conventionally, as an EGR gas cooling device for cooling EGR gas, for example, those disclosed in Japanese Patent Application Laid-Open Nos. 9-310995 and 10-227591 are known. FIG.
1 shows an EGR gas cooling device disclosed in Japanese Patent Laid-Open Publication No. 1 (1993) -207, in which a large number of pipe members 2 are arranged in the axial direction of an outer cylinder 1, and both ends of the pipe member 2 are supported by end plates 3. Have been.

[0006] A cooling water inlet pipe 4 is provided around the outer cylinder 1.
And an outlet pipe 5 is opened. Further, an inflow portion 6 through which EGR gas flows is formed at an upper end of the outer cylinder 1, and an outflow portion 7 through which EGR gas flows out is formed at a lower end. A support plate 8 through which the pipe member 2 is inserted is disposed in the outer cylinder 1.

In this cooling device, the support plate 8 is arranged in the outer cylinder 1 to support the pipe member 2, so that the vibration of the pipe member 2 can be effectively suppressed, and The possibility that cracks or the like occur near the end plate 3 of the pipe member 2 due to the vibration of the pipe member 2 can be reduced.

[0008]

However, in such a conventional EGR gas cooling device, since the support plate 8 is simply disposed in the outer cylinder 1, the support plate 8 is located at a predetermined position in the outer cylinder 1. There is a problem that it is difficult to fix easily and securely.

The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide an EGR gas cooling device capable of easily and reliably fixing a support plate at a predetermined position in an outer cylinder. And

[0010]

According to a first aspect of the present invention, there is provided an EGR gas cooling apparatus comprising: a pair of end plates disposed on both sides of an outer cylinder in which a cooling liquid inlet pipe and an outlet pipe are opened;
Arranging a plurality of pipe members between the pair of end plates, forming an inflow portion through which EGR gas flows into one side of the outer cylinder,
In an EGR gas cooling device having an outflow portion through which EGR gas flows out to the other side of the outer cylinder, a support plate through which the plurality of pipe members are inserted is arranged in the outer cylinder, and A protruding portion protruding inward is formed on the supporting plate, and the outer peripheral portion of the support plate is supported by the protruding portion.

According to a second aspect of the present invention, in the EGR gas cooling apparatus according to the first aspect, the projecting portion is
It is characterized in that it is formed so as to sandwich the outer peripheral portion of the support plate. The EGR gas cooling device according to claim 3 is a device according to claim 1.
Alternatively, in the EGR gas cooling device according to claim 2, a plurality of attachment portions are formed at a predetermined angle on an outer peripheral portion of the support plate, and the support plates are spaced apart in an axial direction of the outer cylinder. Arranged and formed with protrusions formed at intervals in the axial direction of the outer cylinder corresponding to the respective support plates, formed at different angular positions on the inner periphery of the outer cylinder, When being accommodated in the cylinder, the mounting portion of the support plate to be accommodated does not interfere with a projection other than the corresponding projection.

According to a fourth aspect of the present invention, in the EGR gas cooling device, a pair of end plates are disposed on both sides of an outer cylinder in which a coolant inlet pipe and an outlet pipe are opened, and a plurality of pipe members are provided between the pair of end plates. And EG is provided on one side of the outer cylinder.
In the EGR gas cooling device having an inflow portion into which the R gas flows, and an outflow portion through which the EGR gas flows out from the other side of the outer cylinder, the plurality of pipe members are inserted into the outer cylinder. And a guide groove for guiding a mounting portion formed on the outer periphery of the support plate is formed on the inner periphery of the outer cylinder.

(Effect) In the EGR gas cooling device of the first aspect, a projecting portion projecting inward is formed on the inner periphery of the outer cylinder, and the outer peripheral portion of the support plate is supported by the projecting portion.

[0014] In the EGR gas cooling device of the second aspect, each protruding portion is formed at an interval corresponding to the thickness of the support plate, and the outer peripheral portion of the support plate is sandwiched between the protruding portions. In the EGR gas cooling device according to the third aspect, the plurality of support plates are arranged at intervals in the axial direction of the outer cylinder, and the mounting portions of the support plates are formed at intervals in the axial direction of the outer cylinder. Supported by the part.

[0015] For example, a plurality of support plates are sequentially accommodated in the outer cylinder from above with the outer cylinder standing, and each protruding portion is formed at a different angular position on the inner circumference of the outer cylinder. Therefore, the mounting portion of the predetermined support plate does not interfere with the protrusions for other support plates. In the EGR gas cooling device according to the fourth aspect, a guide groove for guiding a mounting portion formed on the outer periphery of the support plate is formed on the inner periphery of the outer cylinder, and the support plate is moved along the guide groove to form the support plate. The supporting plate is positioned by contacting the mounting portion of the above with the step portion of the leading end of the guide groove.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of an EGR gas cooling device of the present invention. In the drawing, reference numeral 11 denotes an outer cylinder. The outer cylinder 11 has a cylindrical shape and is made of stainless steel.

On the outer periphery of the outer cylinder 11, an inlet pipe 13 and an outlet pipe 15 for the coolant are opened. A pair of end plates 17 made of stainless steel are provided on both sides of the outer cylinder 11.
Is arranged. The end plate 17 has a large number of through holes 17a.
Are formed, and the pipe member 19 is inserted into the through hole 17a.
Is inserted.

The pipe member 19 is formed of stainless steel. An inflow portion 21 into which EGR gas flows is formed on one side of the outer cylinder 11, and an outflow portion 23 from which EGR gas flows out is formed on the other side of the outer cylinder 11. The inflow portion 21 and the outflow portion 23 are formed of stainless steel. In the inflow part 21 and the outflow part 23,
Flange portions 25 and 27 to which the inlet pipe and the outlet pipe of the EGR gas are connected are formed.

In this embodiment, a support plate 29 is disposed inside the outer cylinder 11. This support plate 29
It is made of stainless steel, and has a through hole 29a through which the pipe member 19 is inserted, as shown in FIG. Through hole 29a arranged inside support plate 29
Are connected by the connection opening 29b.
9b forms a flow passage for the coolant.

The through-hole 29a disposed outside the support plate 29 is formed in a semicircular shape, and a coolant flow passage 31 is formed between the through-hole 29a and the outer cylinder 11. I have. At the outer periphery of the support plate 29, a mounting portion 29c is formed at an angle of 120 degrees. The outer periphery of the mounting portion 29c has an arc shape and is in contact with the inner periphery of the outer cylinder 11.

In this embodiment, as shown in FIGS. 3 and 4, the outer cylinder 11 is formed with a projecting portion 33 projecting inward. The protruding portion 33 is formed at a position corresponding to the mounting portion 29c of the support plate 29. The protrusion 33 is formed integrally with the outer cylinder 11 by embossing the outer cylinder 11.

One side of the protruding portion 33 has a right-angled step portion 33a.
The mounting portion 2 of the support plate 29 is provided on the side surface of the step portion 33a.
9c is in contact with the side surface. In the above-described EGR gas cooling device, the pipe member 19 is inserted into the support plate 29, and the support plate 29 is temporarily fixed with an adhesive or the like so that the support plate 29 is located at a predetermined position of the pipe member 19, and the pipe member 19 is connected to the pipe member 19 The support plate 29 is accommodated in the outer cylinder 11 together with the mounting plate 19, and the mounting portion 29 c on the outer periphery of the support plate 29 abuts on the step 33 a of the protrusion 33 on the inner periphery of the outer cylinder 11, thereby positioning the support plate 29.

In this state, the end plates 25 and 27 are arranged at both ends of the outer cylinder 11, and the inflow portion 21 and the outflow portion 2
3 and the like are assembled to the outer cylinder 11, and in this state, the contact portions of the respective members are manufactured by, for example, nickel brazing. In the above-described EGR gas cooling device, after the EGR gas from the exhaust system flows into the inflow portion 21 from the flange portion 25 of the inflow portion 21 formed on one side of the outer cylinder 11, the end of the outer cylinder 11 Flows into a pipe member 19 disposed between the plates 25 and 27, and the outer cylinder 1
After being cooled by heat exchange with the coolant flowing between the first end plates 25 and 27, the coolant flows out of the flange portion 27 of the outflow portion 23 formed on the other side of the outer cylinder 11 to the intake manifold side.

In the above-described EGR gas cooling device, the outer cylinder 1
A protruding portion 33 protruding inward is formed on the inner periphery of 1,
Since the mounting portion 29c of the support plate 29 is supported by the projecting portion 33, the support plate 29 can be easily and reliably fixed at a predetermined position in the outer cylinder 11 by brazing or the like.
FIGS. 5 and 6 show a second embodiment of the EGR gas cooling device of the present invention.
In this embodiment, the outer cylinder 11
In the axial direction, three support plates 29 are arranged at intervals.

The mounting portion 29c on the outer periphery of the support plate 29 is supported by a support portion 35 formed on the outer cylinder 11. As shown in FIG. 7, the support portion 35 is formed by a pair of protrusions 33b formed at predetermined intervals in the axial direction of the outer cylinder 11. This pair of protrusions 3
3b, a rectangular recess 33c is formed on the inner circumference of the outer cylinder 11.
Are formed.

The width of the concave portion 33c is formed slightly larger than the thickness of the mounting portion 29c of the support plate 29, and the mounting portion 29c of the support plate 29 is inserted into the concave portion 33c. That is, the mounting portion 29c of the support plate 29 is sandwiched between the pair of projecting portions 33b. EG of this embodiment
In the R gas cooling device, the three support plates 29 are assembled into the outer cylinder 11 as described below.

That is, first, the pipe member 19 is inserted into the three support plates 29, and the three support plates 29
9 is temporarily fixed by an adhesive or the like so as to be located at a predetermined position. Next, the mounting portion 29c of the support plate 29 is
Support plate 29 in a position where it does not interfere with
Is moved into the outer cylinder 11 so that the support plate 29 is accommodated in the outer cylinder 11 together with the pipe member 19.

Then, the three support plates 29 are provided with the projections 33b.
By rotating the pipe member 19 at the same axial length position as the above, the mounting portion 29c on the outer periphery of the support plate 29 is turned into the concave portion 3 formed by the pair of protrusions 33b.
3c, the three support plates 29 are positioned. Then, in this state, the end plates 2 are attached to both ends of the outer cylinder 11.
5 and 27 are arranged, and further, the inflow portion 21, the outflow portion 23, and the like are assembled to the outer cylinder 11, and in this state, the contact portions of the members are
For example, it is manufactured by nickel brazing.

In the above-described EGR gas cooling device, the pair of projections 33b forming the support portion 35 are formed at intervals corresponding to the thickness of the support plate 29, and the pair of projections 33b are formed.
Since the mounting portion 29c on the outer periphery of the support plate 29 is sandwiched between them, the support plate 29 can be more securely fixed at a predetermined position in the outer cylinder 11. 8 and 9 show the EG of the present invention.
This shows a third embodiment of the R gas cooling device. In this embodiment, three R gas cooling devices are arranged at intervals in the axial direction of the outer cylinder 11.
A plurality of support plates 29 are arranged.

The mounting portion 29c on the outer periphery of the support plate 29 is supported by a support portion 35A formed on the outer cylinder 11. Each support portion 35A includes a pair of projecting portions 33d formed at a predetermined interval in the axial direction of the outer cylinder 11,
33e. In this embodiment, FIG.
At the back side protruding portion 33 located on the left side of the support portion 35A
The length of d is about twice as long as the length of the front-side protruding portion 33e located on the right side of the support portion 35A.

The lower part 33d and the lower part 33e have the same position on the lower side, and the lower part 33d and the lower part 33e are supported between the lower part 33d and the lower part 33e. Projection 33 for preventing rotation of mounting portion 29c of plate 29
f is formed. In this embodiment, the positions of the support portions 35A formed at intervals in the axial direction of the outer cylinder 11 corresponding to the respective support plates 29 are formed at different angular positions on the inner circumference of the outer cylinder 11. ing.

The position of the support portion 35A is such that when the support plate 29 is accommodated in the outer cylinder 11, the mounting portion 29c of the accommodated support plate 29 has a protrusion 33d other than the corresponding protrusion 33d.
It is formed at a position that does not interfere with d. That is, at the position of section AA in FIG. 8, as shown on the right side in FIG. 9, three support portions 35 </ b> A formed on the outer circumference of the outer cylinder 11.
One of the support portions 35A is formed so as to be located on the X axis 37.

More specifically, the center of the rear projection 33d is located on the X-axis 37, and the tip of the front projection 33e is located on the X-axis 37. Then, the support portion 35A
Are formed at three places at an angle of 120 degrees.
Also, at the position of section BB in FIG. 8, as shown in the center of FIG. 9, one of the three support portions 35A formed on the outer periphery
The supporting portion 35A is formed so as to be located at a position rotated clockwise by 30 degrees from the X axis 37.

Further, at the position of section CC in FIG.
As shown on the left side, one of the three support portions 35A formed on the outer periphery is formed so as to be located at a position rotated clockwise by 60 degrees from the X axis 37. In the EGR gas cooling device of this embodiment, the three support plates 29 are assembled into the outer cylinder 11 as described below.

That is, first, the outer cylinder 11 is
A is set up so that the rear protruding part 33d of A is lower than the front protruding part 33e, and a cross section C-
The support plate 29 located at C is accommodated in the outer cylinder 11.
At the time of this storage, the mounting portion 29c of the support plate 29 is rotated clockwise 15 degrees from the state shown in the left diagram of FIG. 9, and by lowering the support plate 29 in this state, The plate 29 is placed on the rear projection 33d of the cross section CC without interfering with the rear projection 33d of the support 35A of the cross section AA and the cross section BB.

Then, by rotating the support plate 29 counterclockwise by 15 degrees from this state, the mounting portion 29 of the support plate 29 is rotated.
9c abuts on the protrusion 33f, and the support plate 29 maintains the positional relationship on the left side in FIG.
e. Next, the support plate 29 located at the section BB from the upper end of the outer cylinder 11 is accommodated in the outer cylinder 11.

At the time of this storage, the mounting portion 29 of the support plate 29
9C has been rotated clockwise by 15 degrees from the state shown in the center view of FIG. 9, and by lowering the support plate 29 in this state, the support plate 29 is supported by the section AA. Without interfering with the rear protruding portion 33d of the portion 35A,
-B is placed on the rear side protruding portion 33d. Then, by rotating the support plate 29 counterclockwise by 15 degrees from this state, the mounting portion 29c of the support plate 29 comes into contact with the protrusion 33f, and the support plate 29 maintains the central positional relationship in FIG. It is sandwiched between the protruding portion 33d and the near side protruding portion 33e.

Next, the support plate 29 located at the section AA from the upper end of the outer cylinder 11 is accommodated in the outer cylinder 11. At this time, the mounting portion 29c of the support plate 29 is rotated clockwise 15 degrees from the state shown in the right side of FIG. 9, and by lowering the support plate 29 in this state,
The support plate 29 is placed on the rear-side protruding portion 33d of the cross section AA.

By rotating the support plate 29 counterclockwise by 15 degrees from this state, the mounting portion 29 of the support plate 29 is rotated.
9C abuts on the projection 33f, and the support plate 29 maintains the positional relationship on the right side in FIG.
e. After the three support plates 29 are accommodated at predetermined positions in the outer cylinder 11 in this manner, the pipe member 19 is inserted through the three support plates 29.

In this state, the end plates 25 and 27 are arranged at both ends of the outer cylinder 11, and the inflow portion 21 and the outflow portion 2
3 and the like are assembled to the outer cylinder 11, and in this state, the contact portions of the respective members are manufactured by, for example, nickel brazing. In the above-described EGR gas cooling device, the support portions 35A formed at intervals in the axial direction of the outer cylinder 11 are formed at different angular positions on the inner circumference of the outer cylinder 11, and the outer cylinder 11 of the support plate 29 is formed. At the time of accommodation into the inside, the mounting portion 29c of the support plate 29 to be accommodated is located at the back side protruding portion 33d of the corresponding support portion 35A.
Since it did not interfere with the rear protruding part 33d other than
The plurality of support plates 29 can be easily arranged at predetermined positions in the outer cylinder 11.

Further, since it is possible to set the distance between the plurality of support plates 29 in the axial direction by the support portion 35A, the plurality of support plates 29 are not temporarily fixed to the pipe member 19 in advance. 29 can be arranged inside the outer cylinder 11. 10 and 11 show a fourth embodiment of the EGR gas cooling device of the present invention. In this embodiment, the first and second EGR gas cooling devices are spaced apart from each other in the axial direction of the outer cylinder 11. Two support plates 29A and 29B are arranged.

Then, a first guide for guiding an attachment portion 29d formed on the outer periphery of the first support plate 29A to the inner periphery of the outer cylinder 11 is provided.
Guide groove 39 is formed. This first guide groove 39
, The outer periphery of the mounting portion 29d is directly fitted. On the other hand, a guide projection 29e is formed on the outer periphery of the mounting portion 29c of the second support plate 29B.

The guide projection 29 formed on the outer periphery of the mounting portion 29c of the second support plate 29B is formed on the inner periphery of the outer cylinder 11.
e, a second guide groove 41 for guiding e is formed. First
The guide groove 39 and the second guide groove 41 are 12
It is formed at three places at an angle of 0 degrees. And
In this embodiment, the first guide groove 39 and the second guide groove 4
1 is shifted from the first guide groove 3 by 60 degrees.
9, a second guide groove 41 is formed.

Further, the first guide groove 39 and the second guide groove 41 are formed from one side of the outer cylinder 11, and the first guide groove 39 has a length equal to the length of the second guide groove 41. It is about twice as long. First guide groove 39 and second guide groove 4
A right-angled step (not shown) is formed at the tip of 1.

In the EGR gas cooling device of this embodiment,
The first and second support plates 29A and 29B are assembled into the outer cylinder 11 as described below. That is, first, the mounting portion 29d of the first support plate 29A is
Of the first support plate 29 in this state.
A is moved along the first guide groove 39, and the first support plate 29A is positioned by bringing the mounting portion 29d into contact with the step portion of the first guide groove 39.

Next, the mounting portion 29c of the second support plate 29B
Is fitted in the second guide groove 41, and in this state, the second support plate 29B is moved along the second guide groove 41, and the guide protrusion of the mounting portion 29c is formed. The second support plate 29 is positioned by bringing the 29e into contact with the step of the second guide groove 41. Thus, the first
After the second support plate 29A and the second support plate 29B are accommodated at predetermined positions in the outer cylinder 11, the first and second support plates 29A and 29B are stored.
The pipe member 19 is inserted through A and 29B.

Then, in this state, the end plates 25 and 27 are arranged at both ends of the outer cylinder 11, and the inflow portion 21 and the outflow portion 2
3 and the like are assembled to the outer cylinder 11, and in this state, the contact portions of the respective members are manufactured by, for example, nickel brazing. In the above-described EGR gas cooling device, the attachment portion 29 formed on the inner periphery of the outer cylinder 11 and the outer periphery of the first support plate 29A is provided.
A first guide groove 39 for guiding the first support plate 29 is formed, the first support plate 29A is moved along the first guide groove 39, and the mounting portion 29d of the first support plate 29 is moved to the first guide groove. Since the first support plate 29A is positioned by abutting on the stepped portion of the front end 39, the first support plate 29A is easily and reliably fixed at a predetermined position in the outer cylinder 11 by brazing or the like. be able to.

The second support plate 2 is provided on the inner periphery of the outer cylinder 11.
Guide protrusion 29e of attachment portion 29c formed on the outer periphery of 9B
Is formed, the second support plate 29B is moved along the second guide groove 41, and the guide protrusion 29e of the mounting portion 29c of the second support plate 29B is moved to the second position. The second support plate 29B is positioned by contacting the stepped end of the second guide groove 41, so that the second support plate 29B can be easily positioned at a predetermined position in the outer cylinder 11 by brazing or the like. It can be fixed securely.

When brazing is performed, since the brazing material flows along the first guide groove 39 and the second guide groove 41, the brazing can be performed reliably. Further, in the above-described EGR gas cooling device, the first and second
Of the support plates 29A, 29B in the axial direction can be set by the first and second guide grooves 39, 41, so that a plurality of support plates 29A, 29
The support plates 29A and 29B can be arranged in the outer cylinder 11 without temporarily fixing B in advance.

[0050]

As described above, in the EGR gas cooling device according to the first aspect, a projecting portion projecting inward is formed on the inner periphery of the outer cylinder, and the projecting portion supports the outer peripheral portion of the support plate. Therefore, the support plate can be easily and reliably fixed at a predetermined position in the outer cylinder by brazing or the like.

In the EGR gas cooling device according to the second aspect, each projection is formed at an interval corresponding to the thickness of the support plate,
Since the outer peripheral portion of the support plate is sandwiched between the protruding portions, the support plate can be more reliably fixed at a predetermined position in the outer cylinder. In the EGR gas cooling device according to the third aspect, the projections formed at intervals in the axial direction of the outer cylinder are formed at different angular positions on the inner circumference of the outer cylinder, and the support plate is inserted into the outer cylinder. At the time of accommodation, the mounting portion of the accommodated support plate is prevented from interfering with the projecting portion other than the corresponding projecting portion, so that a plurality of support plates can be easily arranged at predetermined positions in the outer cylinder.

Further, since it is possible to set the distance between the plurality of support plates in the axial direction by the protruding portions, the support plates are not temporarily fixed to the pipe member in advance, and the support plates are not fixed in the outer cylinder. Can be arranged. In the EGR gas cooling device according to the fourth aspect, a guide groove for guiding a mounting portion formed on the outer periphery of the support plate is formed on the inner periphery of the outer cylinder, and the support plate is moved along the guide groove to form the support plate. The support plate is positioned by contacting the mounting portion with the leading end of the guide groove, so that the support plate can be easily and reliably fixed to a predetermined position in the outer cylinder by brazing or the like.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of an EGR gas cooling device of the present invention.

FIG. 2 is a front view showing the support plate of FIG. 1;

FIG. 3 is a perspective view showing the outer cylinder of FIG. 1;

FIG. 4 is a cross-sectional view showing a protruding portion of FIG. 1 and its vicinity.

FIG. 5 is a side view showing a second embodiment of the EGR gas cooling device of the present invention.

FIG. 6 is a front view showing the support plate of FIG. 5;

FIG. 7 is an explanatory view showing a protruding portion of FIG. 1 and its vicinity.

FIG. 8 is a side view showing a third embodiment of the EGR gas cooling device of the present invention.

9 is a front view showing the support plate of FIG. 8 at each cross-sectional position.

FIG. 10 is a side view showing a fourth embodiment of the EGR gas cooling device of the present invention.

11 is a front view showing the support plate of FIG. 10 at each cross-sectional position.

FIG. 12 is a side view showing a conventional EGR gas cooling device.

[Explanation of symbols]

 Reference Signs List 11 outer cylinder 13 inlet pipe 15 outlet pipe 17 end plate 19 pipe member 21 inflow portion 23 outflow portion 29, 29A, 29B support plate 33, 33b, 33d, 33e projecting portion 39 first guide groove 41 second guide groove

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Yoshida 5-24-15 Minamidai, Nakano-ku, Tokyo Inside Calsonic Co., Ltd. (72) Inventor Tatsuo Ozawa 5-24-15 Minamidai, Nakano-ku, Tokyo Calso Nick Co., Ltd. (72) Inventor Shigeki Kimura 3-5-1 Fujisaki, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture F-term in Tokyo Radiator Manufacturing Co., Ltd. 3L103 AA01 BB17 BB39 CC27 DD08 DD42 DD44 DD62

Claims (4)

[Claims] 1. A pair of end plates (17) are arranged on both sides of an outer cylinder (11) in which an inlet pipe (13) and an outlet pipe (15) of a coolant are opened, and the pair of end plates (17) are arranged. 17), a plurality of pipe members (19) are arranged, an inflow portion (21) through which EGR gas flows into one side of the outer cylinder (11), and the other side of the outer cylinder (11) is formed. An EGR gas cooling device having an outflow portion (23) through which EGR gas flows out, wherein a support plate (29) through which the plurality of pipe members (19) are inserted is disposed in the outer cylinder (11). And projecting portions (33, 33) projecting inward to the outer cylinder (11).
b, 33d, 33e), and the protrusions (33, 3
3b, 33d, 33e) supporting the outer periphery of the support plate (29). 2. The EGR gas cooling device according to claim 1, wherein the protrusions (33b, 33d, 33e) are formed so as to sandwich an outer peripheral portion of the support plate (29). EGR gas cooling device. 3. The EGR gas cooling device according to claim 1, wherein a plurality of attachment portions (29c) are formed at a predetermined angle on an outer peripheral portion of the support plate (29), and the support plate is formed. (2
9) are arranged at intervals in the axial direction of the outer cylinder (11), and the outer cylinder (1) is arranged corresponding to each of the support plates (29).
Projections (33) formed at intervals in the axial direction of 1)
d, 33e) are formed at different angular positions on the inner circumference of the outer cylinder (11), and the outer cylinder (11) of the support plate (29) is formed.
When the support plate (29) is accommodated in the housing, the mounting portion (29c) of the support plate (29) accommodates the corresponding protruding portion (33d, 33e).
An EGR gas cooling device characterized in that it does not interfere with other protruding portions (33d, 33e). 4. A pair of end plates (17) are arranged on both sides of an outer cylinder (11) in which a cooling liquid inlet pipe (13) and an outlet pipe (15) are opened, and said pair of end plates (17) are arranged. 17), a plurality of pipe members (19) are arranged, an inflow portion (21) through which EGR gas flows into one side of the outer cylinder (11), and the other side of the outer cylinder (11) is formed. An EGR gas cooling device comprising an outflow portion (23) through which EGR gas flows out, wherein a support plate (29A, 29B) through which the plurality of pipe members (19) are inserted into the outer cylinder (11). And the support plate (29A,
Mounting part (29d, 29c) formed on the outer periphery of 29B)
An EGR gas cooling device characterized by forming guide grooves (39, 41) for guiding the EGR gas.