JP2000265908A - Egr gas cooling device - Google Patents
Egr gas cooling deviceInfo
- Publication number
- JP2000265908A JP2000265908A JP11066805A JP6680599A JP2000265908A JP 2000265908 A JP2000265908 A JP 2000265908A JP 11066805 A JP11066805 A JP 11066805A JP 6680599 A JP6680599 A JP 6680599A JP 2000265908 A JP2000265908 A JP 2000265908A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- egr
- egr gas
- cooling
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
- F28D7/103—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of more than two coaxial conduits or modules of more than two coaxial conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/02—Tubular elements of cross-section which is non-circular
- F28F1/06—Tubular elements of cross-section which is non-circular crimped or corrugated in cross-section
Abstract
Description
【０００１】[0001]
【技術分野】本発明は，内燃機関から排出された排出ガ
スをＥＧＲガスとして内燃機関に再度還流する際に，Ｅ
ＧＲガスを冷却するＥＧＲガス冷却装置に関する。BACKGROUND OF THE INVENTION The present invention relates to a method for recirculating exhaust gas discharged from an internal combustion engine to the internal combustion engine as EGR gas.
The present invention relates to an EGR gas cooling device that cools GR gas.
【０００２】[0002]
【従来技術】ＥＧＲガス冷却装置は，内燃機関の排気系
から排出された排出ガスの一部をＥＧＲ管を介して吸気
系に戻し，ＥＧＲガスとして混合気に加える排出ガス再
循環を行う際に，上記ＥＧＲ管内のＥＧＲガスを冷却す
る。従来のＥＧＲ管９２は，図４に示すごとく，その外
側に上記ＥＧＲガスＧを冷却するための冷却水Ｗを流す
冷却管９３を設けた二重管構造を有している。2. Description of the Related Art An EGR gas cooling device is used to return a part of exhaust gas discharged from an exhaust system of an internal combustion engine to an intake system via an EGR pipe and recirculate exhaust gas to be added to an air-fuel mixture as EGR gas. The EGR gas in the EGR pipe is cooled. As shown in FIG. 4, the conventional EGR pipe 92 has a double pipe structure in which a cooling pipe 93 through which a cooling water W for cooling the EGR gas G is provided outside the EGR pipe 92.
【０００３】二重管構造を構成する内管（ＥＧＲ管９
２）は，その内側の管壁にろう付けで固定したフィン９
４を有する。金属板であるフィン９４は，ＥＧＲ管９２
の軸芯に沿って配設されており，ＥＧＲ管９２の内側を
流れるＥＧＲガスＧの熱を，ＥＧＲ管９２の外側を流れ
る冷却水Ｗへ逃がしている。[0003] An inner pipe (EGR pipe 9) constituting a double pipe structure
2) The fins 9 brazed to the inner tube wall
4 The fins 94, which are metal plates, are
The heat of the EGR gas G flowing inside the EGR pipe 92 is released to the cooling water W flowing outside the EGR pipe 92.
【０００４】[0004]
【解決しようとする課題】しかしながら，上記従来のＥ
ＧＲガス冷却装置９には，次の問題がある。即ち，上記
ＥＧＲ管９２は，フィン９４を内側の管壁にろう付けし
て製造しなくてはならず，ＥＧＲ管９２へのフィン９４
の接続等，部品の信頼性を向上させることが困難であ
る。また，構成部品が多いため，コスト低減を図ること
も困難である。また，フィン９４とＥＧＲ管９２との間
に介在するろう材の熱伝導率が低いと，熱交換率（冷却
効率）が低下する。However, the above-mentioned conventional E
The GR gas cooling device 9 has the following problems. That is, the EGR pipe 92 must be manufactured by brazing the fins 94 to the inner pipe wall.
It is difficult to improve the reliability of components, such as connection of the components. Also, since there are many components, it is difficult to reduce costs. Further, if the heat conductivity of the brazing material interposed between the fin 94 and the EGR pipe 92 is low, the heat exchange rate (cooling efficiency) decreases.
【０００５】本発明は，かかる従来の問題点に鑑みてな
されたもので，部品の信頼性を向上すると共に，コスト
を低減することができ，かつ熱交換率を向上することが
できるＥＧＲガス冷却装置を提供しようとするものであ
る。The present invention has been made in view of the above-mentioned conventional problems, and it is possible to improve the reliability of parts, reduce costs, and improve the heat exchange rate by using EGR gas cooling. It is intended to provide a device.
【０００６】[0006]
【課題の解決手段】請求項１に記載の発明は，内燃機関
の排気系から排出された排出ガスの一部をＥＧＲ管を介
して吸気系に戻し，ＥＧＲガスとして混合気に加える排
出ガス再循環を行うに際して，上記ＥＧＲガスを冷却す
るＥＧＲガス冷却装置において，上記ＥＧＲ管は，その
外側又は内側に上記ＥＧＲガスを冷却するための冷却水
を流す冷却管を設けた二重管構造を有しており，かつ，
該二重管構造を構成する内管は，該内管の管壁の一部を
内方に窪ませて形成した凹部を有することを特徴とする
ＥＧＲガス冷却装置にある。According to a first aspect of the present invention, a part of exhaust gas discharged from an exhaust system of an internal combustion engine is returned to an intake system via an EGR pipe, and the exhaust gas is added to an air-fuel mixture as EGR gas. In performing the circulation, the EGR gas cooling device for cooling the EGR gas has a double pipe structure in which a cooling pipe through which cooling water for cooling the EGR gas flows is provided outside or inside the EGR pipe. And
The EGR gas cooling device is characterized in that the inner pipe constituting the double pipe structure has a concave portion formed by indenting a part of the pipe wall of the inner pipe inward.
【０００７】本発明において最も注目すべきことは，上
記二重管構造を有するＥＧＲ管の内管には，該内管の管
壁の一部より形成された上記凹部を設けてあることであ
る。The most remarkable point in the present invention is that the inner pipe of the EGR pipe having the double pipe structure is provided with the concave portion formed by a part of the pipe wall of the inner pipe. .
【０００８】上記ＥＧＲ管が，その外側に上記冷却水を
流す冷却管を設けた二重管構造を有する場合には，その
内管がＥＧＲ管，外管が冷却管となり，内管の内部にＥ
ＧＲガスを，内管と外管との間に冷却水を通す構造とな
る。逆に，上記ＥＧＲ管が，その内側に上記冷却水を流
す冷却管を設けた二重管構造を有する場合には，その内
管が冷却管，外管がＥＧＲ管となり，内管の内部に冷却
水を，内管と外管との間にＥＧＲガスを通す構造とな
る。In the case where the EGR pipe has a double pipe structure provided with a cooling pipe through which the cooling water flows, the inner pipe becomes the EGR pipe, the outer pipe becomes the cooling pipe, and the inner pipe becomes the inside of the inner pipe. E
The structure is such that the GR gas allows cooling water to pass between the inner pipe and the outer pipe. Conversely, when the EGR pipe has a double pipe structure provided with a cooling pipe through which the cooling water flows, the inner pipe becomes the cooling pipe, the outer pipe becomes the EGR pipe, and the inner pipe becomes the inner pipe. The cooling water has a structure in which EGR gas is passed between the inner pipe and the outer pipe.
【０００９】次に，本発明の作用につき説明する。本発
明においては，上記内管に上記凹部を設けることによ
り，上記内管の管壁の表面積を増加させているため，該
内管を介して上記ＥＧＲガスの熱を上記冷却水へ効率良
く伝達することができる。そのため，上記内管自体によ
って上記ＥＧＲガスの熱を上記冷却水へ逃がすことがで
きるので，上記内管には，従来例に示したようにフィン
をろう付けする必要がない。それ故，部品の信頼性を向
上させることができる。また，構成部品が少なくなるた
め，コストを低減することができる。Next, the operation of the present invention will be described. In the present invention, since the surface area of the tube wall of the inner tube is increased by providing the concave portion in the inner tube, the heat of the EGR gas is efficiently transmitted to the cooling water via the inner tube. can do. Therefore, since the heat of the EGR gas can be released to the cooling water by the inner pipe itself, there is no need to braze the inner pipe with a fin as shown in the conventional example. Therefore, the reliability of the parts can be improved. In addition, since the number of components is reduced, costs can be reduced.
【００１０】また，上記ＥＧＲガスの熱は，従来例に示
したろう材等を介することなく，直接に上記内管に伝達
させるため，熱交換率を向上することができる。Further, since the heat of the EGR gas is directly transmitted to the inner pipe without passing through the brazing material shown in the conventional example, the heat exchange rate can be improved.
【００１１】[0011]
【発明の実施の形態】実施形態例 本発明の実施形態例にかかるＥＧＲガス冷却装置につ
き，図１〜図３を用いて説明する。本例のＥＧＲガス冷
却装置１は，図１〜図３に示すごとく，内燃機関の排気
系から排出された排出ガスの一部をＥＧＲ管２を介して
吸気系に戻し，ＥＧＲガスＧとして混合気に加える排出
ガス再循環を行うに際して，上記ＥＧＲガスＧを冷却す
る。上記ＥＧＲ管２は，その外側に上記ＥＧＲガスＧを
冷却するための冷却水Ｗを流す冷却管３を設けた二重管
構造を有している。また，該二重管構造を構成する内管
（以下，ＥＧＲ管２）は，該ＥＧＲ管２の管壁の一部を
内方に窪ませて形成した凹部２１を有する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment An EGR gas cooling apparatus according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 3, the EGR gas cooling device 1 of the present embodiment returns a part of the exhaust gas discharged from the exhaust system of the internal combustion engine to the intake system via the EGR pipe 2 and mixes it as the EGR gas G. When recirculating exhaust gas to be added to the air, the EGR gas G is cooled. The EGR pipe 2 has a double pipe structure provided with a cooling pipe 3 through which cooling water W for cooling the EGR gas G is provided outside the EGR pipe 2. The inner pipe (hereinafter, EGR pipe 2) constituting the double pipe structure has a concave portion 21 formed by indenting a part of the pipe wall of the EGR pipe 2 inward.
【００１２】以下，詳説する。上記ＥＧＲ管２は，図２
に示すごとく，内燃機関（図示略）の排気系と吸気系と
の間を連通するものであり，排出ガス取入口２２を上記
排気系に接続すると共に，ＥＧＲガス排出口２３を上記
吸気系に接続してある。上記ＥＧＲ管２は，その中間部
分に上記凹部２１を有している。上記凹部２１は，円筒
状のステンレス管に対してプレス加工を施すことによ
り，上記ＥＧＲ管２の軸芯に沿って形成したものであ
る。The details will be described below. The EGR pipe 2 is shown in FIG.
As shown in the figure, the exhaust system and the intake system of the internal combustion engine (not shown) communicate with each other. The exhaust gas inlet 22 is connected to the exhaust system, and the EGR gas outlet 23 is connected to the intake system. Connected. The EGR pipe 2 has the concave portion 21 at an intermediate portion thereof. The recess 21 is formed along the axis of the EGR tube 2 by pressing a cylindrical stainless steel tube.
【００１３】上記ＥＧＲ管２は，図１に示すごとく，断
面略Ｖ字状の凹部２１を等間隔に５本有しており，その
断面は花弁状である。なお，上記ＥＧＲ管２は二重管構
造の内管であり，その内部２０には上記ＥＧＲガスＧが
通っている。上記冷却管３は，図１に示すごとく，上記
ＥＧＲ管２と軸芯を同じくして配設してあり，上記ＥＧ
Ｒ管２の外径よりも大きい内径を有する。なお，上記冷
却管３は二重管構造の外管であり，上記ＥＧＲ管２との
間には上記冷却水Ｗが通っている。As shown in FIG. 1, the EGR pipe 2 has five recesses 21 having a substantially V-shaped cross section at equal intervals, and the cross section thereof has a petal shape. Note that the EGR pipe 2 is an inner pipe having a double pipe structure, and the EGR gas G passes through the inside 20 thereof. As shown in FIG. 1, the cooling pipe 3 is disposed so as to have the same axis as the EGR pipe 2, and
It has an inner diameter larger than the outer diameter of the R tube 2. The cooling pipe 3 is an outer pipe having a double pipe structure, and the cooling water W flows between the cooling pipe 3 and the EGR pipe 2.
【００１４】上記冷却管３は，図２に示すごとく，上記
ＥＧＲ管２の中間部分の外方に配設されており，その端
部側面には，冷却水取入口３２及び冷却水排出口３３が
設けてある。As shown in FIG. 2, the cooling pipe 3 is disposed outside a middle portion of the EGR pipe 2, and a cooling water inlet 32 and a cooling water outlet 33 are provided on the side of the end. Is provided.
【００１５】次に，本例の作用につき説明する。本例に
おいては，上記ＥＧＲ管２に上記複数の凹部２１を設け
ることにより，上記ＥＧＲ管２の管壁の表面積を大幅に
増加させている。そのため，上記ＥＧＲ管２を介して，
その内側を流れるＥＧＲガスＧの熱を，その外側を流れ
る上記冷却水Ｗへ，効率良く伝達することができる。ま
た，上記ＥＧＲガスＧ及び冷却水Ｗの流れに合わせて，
上記凹部２１を上記ＥＧＲ管２の軸芯に沿って形成して
いるため，さらに熱伝達の効率を上げることができる。Next, the operation of this embodiment will be described. In this example, the surface area of the tube wall of the EGR tube 2 is greatly increased by providing the plurality of recesses 21 in the EGR tube 2. Therefore, via the EGR pipe 2,
The heat of the EGR gas G flowing inside can be efficiently transmitted to the cooling water W flowing outside. Further, according to the flow of the EGR gas G and the cooling water W,
Since the concave portion 21 is formed along the axis of the EGR pipe 2, the efficiency of heat transfer can be further increased.
【００１６】そのため，上記ＥＧＲ管２自体によって上
記ＥＧＲガスＧの熱を上記冷却水Ｗへ逃がすことができ
るので，上記ＥＧＲ管２には，従来例に示したようにフ
ィンをろう付けする必要がない。それ故，部品の信頼性
を向上させることができる。また，構成部品が少なくな
るため，コストを低減することができる。また，上記Ｅ
ＧＲガスＧの熱は，従来例に示したろう材等を介するこ
となく，直接に上記ＥＧＲ管２に伝達させるため，熱交
換率（冷却効率）を向上することができる。Therefore, since the heat of the EGR gas G can be released to the cooling water W by the EGR pipe 2, the fins need to be brazed to the EGR pipe 2 as shown in the conventional example. Absent. Therefore, the reliability of the parts can be improved. Further, since the number of components is reduced, the cost can be reduced. The above E
Since the heat of the GR gas G is directly transmitted to the EGR pipe 2 without passing through the brazing material shown in the conventional example, the heat exchange rate (cooling efficiency) can be improved.
【００１７】従って，上記ＥＧＲガス冷却装置１は，上
記ＥＧＲ管２の内部を通過するＥＧＲガスＧの温度を効
率良く下げることができる。そのため，上記ＥＧＲ管２
の内部を通過したＥＧＲガスＧの体積が小さくなるの
で，より多くのＥＧＲガスＧを上記吸気系に戻すことが
できる。それ故，効率良く燃焼温度を下げ，スモークや
ＮＯｘ等の生成を抑制することができる。Therefore, the EGR gas cooling device 1 can efficiently lower the temperature of the EGR gas G passing through the inside of the EGR pipe 2. Therefore, the EGR pipe 2
The volume of the EGR gas G that has passed through the inside becomes smaller, so that more EGR gas G can be returned to the intake system. Therefore, the combustion temperature can be efficiently reduced, and generation of smoke, NOx, and the like can be suppressed.
【００１８】なお，本例においては，プレス加工により
凹部２１を形成したＥＧＲ管２を示したが，図３に示す
ごとく，上記凹部２１を有するＥＧＲ管２としては，断
面波状のステンレス板２５を丸めて，その両端２５１，
２５２を溶接等により接合したものを用いることもでき
る。なお，上記ステンレス板２５に囲まれた部分が上記
ＥＧＲ管２の内部２０であり，ここにＥＧＲガスが通
る。In this embodiment, the EGR tube 2 in which the concave portion 21 is formed by pressing is shown. However, as shown in FIG. 3, the EGR tube 2 having the concave portion 21 is a stainless steel plate 25 having a corrugated cross section. Roll it up and its ends 251,
252 can also be used by welding or the like. The portion surrounded by the stainless steel plate 25 is the inside 20 of the EGR pipe 2, through which the EGR gas passes.
【００１９】なお，上記ＥＧＲ管２の断面形状は，上記
花弁状に限らず，例えば歯車状，星状等にすることがで
きる。また，上記ＥＧＲ管２の凹部２１は，ＥＧＲ管２
の軸芯に沿った直線状に限らず，軸芯の廻りにスパイラ
ル状に設けてもよい。The cross-sectional shape of the EGR tube 2 is not limited to the petal shape, but may be, for example, a gear shape, a star shape, or the like. The recess 21 of the EGR pipe 2 is
It is not limited to a linear shape along the axis, but it may be provided in a spiral around the axis.
【００２０】また，本例においては，上記ＥＧＲ管２の
外側に上記冷却管３を配設し，上記ＥＧＲ管２が内管と
なる場合を示したが，上記ＥＧＲ管２の内側に上記冷却
管３を配設し，上記冷却管３が内管となる場合において
も，この内管に上記凹部を設けることにより，上記と同
様の作用効果を得ることができる。In this embodiment, the cooling pipe 3 is provided outside the EGR pipe 2 and the EGR pipe 2 is an inner pipe. However, the cooling pipe 3 is provided inside the EGR pipe 2. Even in the case where the pipe 3 is provided and the cooling pipe 3 is an inner pipe, the same operation and effect as described above can be obtained by providing the inner pipe with the concave portion.
【００２１】[0021]
【発明の効果】上述のごとく，本発明によれば，部品の
信頼性を向上すると共に，コストを低減することがで
き，かつ熱交換率を向上することができるＥＧＲガス冷
却装置を提供することができる。As described above, according to the present invention, it is possible to provide an EGR gas cooling device which can improve the reliability of components, reduce costs and improve the heat exchange rate. Can be.
【図１】実施形態例における，ＥＧＲガス冷却装置の断
面図。FIG. 1 is a cross-sectional view of an EGR gas cooling device according to an embodiment.
【図２】実施形態例における，ＥＧＲガス冷却装置の一
部断面斜視図。FIG. 2 is a partial cross-sectional perspective view of an EGR gas cooling device in the embodiment.
【図３】実施形態例における，他のＥＧＲ管の説明図。FIG. 3 is an explanatory diagram of another EGR pipe in the embodiment.
【図４】従来例における，ＥＧＲガス冷却装置の断面
図。FIG. 4 is a cross-sectional view of an EGR gas cooling device in a conventional example.
１．．．ＥＧＲガス冷却装置， ２．．．ＥＧＲ管（内管）， ２１．．．凹部， ３．．．冷却管（外管）， Ｇ．．．ＥＧＲガス， Ｗ．．．冷却水， 1. . . 1. EGR gas cooling device, . . 21. EGR pipe (inner pipe), . . Recess, 3. . . Cooling pipe (outer pipe), G. . . EGR gas; . . Cooling water,
Claims (1)
スの一部をＥＧＲ管を介して吸気系に戻し，ＥＧＲガス
として混合気に加える排出ガス再循環を行うに際して，
上記ＥＧＲガスを冷却するＥＧＲガス冷却装置におい
て，上記ＥＧＲ管は，その外側又は内側に上記ＥＧＲガ
スを冷却するための冷却水を流す冷却管を設けた二重管
構造を有しており，かつ，該二重管構造を構成する内管
は，該内管の管壁の一部を内方に窪ませて形成した凹部
を有することを特徴とするＥＧＲガス冷却装置。When returning a part of exhaust gas discharged from an exhaust system of an internal combustion engine to an intake system through an EGR pipe and performing exhaust gas recirculation to be added to an air-fuel mixture as EGR gas,
In the EGR gas cooling device for cooling the EGR gas, the EGR pipe has a double pipe structure in which a cooling pipe for flowing cooling water for cooling the EGR gas is provided outside or inside thereof. An EGR gas cooling device, characterized in that the inner pipe constituting the double pipe structure has a recess formed by indenting a part of the pipe wall of the inner pipe inward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11066805A JP2000265908A (en) | 1999-03-12 | 1999-03-12 | Egr gas cooling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11066805A JP2000265908A (en) | 1999-03-12 | 1999-03-12 | Egr gas cooling device |
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| Publication Number | Publication Date |
|---|---|
| JP2000265908A true JP2000265908A (en) | 2000-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP11066805A Pending JP2000265908A (en) | 1999-03-12 | 1999-03-12 | Egr gas cooling device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040003987A (en) * | 2002-07-05 | 2004-01-13 | 주식회사 코렌스 | Apparatus for exhaust gas recirculation of car |
| KR100478217B1 (en) * | 2001-12-13 | 2005-03-24 | 삼성공조 주식회사 | Heat exchanger for exhaust gas recirculation |
| DE10349887A1 (en) * | 2003-10-25 | 2005-06-02 | Benteler Automobiltechnik Gmbh | Exhaust gas reconducting system cooler in internal combustion engine, has flow channel encased by pipe that is shaped based on channel profile to let coolant to flow between chambers, where channel has chambers of rectangular cross section |
| JP2006162238A (en) * | 2004-11-09 | 2006-06-22 | Denso Corp | Double wall tube |
| JP2014109391A (en) * | 2012-11-30 | 2014-06-12 | Toyota Motor Corp | Heat exchanger |
| CN104930878A (en) * | 2015-05-20 | 2015-09-23 | 苏州锦珂塑胶科技有限公司 | Heat exchanger and heat energy recovery device |
| JP2019120174A (en) * | 2017-12-28 | 2019-07-22 | 株式会社クボタ | Egr-equipped engine |
-
1999
- 1999-03-12 JP JP11066805A patent/JP2000265908A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100478217B1 (en) * | 2001-12-13 | 2005-03-24 | 삼성공조 주식회사 | Heat exchanger for exhaust gas recirculation |
| KR20040003987A (en) * | 2002-07-05 | 2004-01-13 | 주식회사 코렌스 | Apparatus for exhaust gas recirculation of car |
| DE10349887A1 (en) * | 2003-10-25 | 2005-06-02 | Benteler Automobiltechnik Gmbh | Exhaust gas reconducting system cooler in internal combustion engine, has flow channel encased by pipe that is shaped based on channel profile to let coolant to flow between chambers, where channel has chambers of rectangular cross section |
| DE10349887B4 (en) * | 2003-10-25 | 2013-03-07 | Benteler Automobiltechnik Gmbh | Radiator for an exhaust gas recirculation system in an internal combustion engine |
| JP2006162238A (en) * | 2004-11-09 | 2006-06-22 | Denso Corp | Double wall tube |
| JP2014109391A (en) * | 2012-11-30 | 2014-06-12 | Toyota Motor Corp | Heat exchanger |
| CN104930878A (en) * | 2015-05-20 | 2015-09-23 | 苏州锦珂塑胶科技有限公司 | Heat exchanger and heat energy recovery device |
| JP2019120174A (en) * | 2017-12-28 | 2019-07-22 | 株式会社クボタ | Egr-equipped engine |
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