JP4939980B2 - EGR cooler - Google Patents
EGR cooler Download PDFInfo
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- JP4939980B2 JP4939980B2 JP2007052786A JP2007052786A JP4939980B2 JP 4939980 B2 JP4939980 B2 JP 4939980B2 JP 2007052786 A JP2007052786 A JP 2007052786A JP 2007052786 A JP2007052786 A JP 2007052786A JP 4939980 B2 JP4939980 B2 JP 4939980B2
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- cooling pipe
- shell
- elastic member
- egr cooler
- plate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Exhaust-Gas Circulating Devices (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Description
本発明は、ＥＧＲ（排気再循環）システムに設けられるＥＧＲクーラに関し、特に熱応力によってＥＧＲクーラに亀裂が発生することを防止するＥＧＲクーラに関する。 The present invention relates to an EGR cooler provided in an EGR (exhaust gas recirculation) system, and more particularly to an EGR cooler that prevents the EGR cooler from cracking due to thermal stress.
エンジンの排気系から吸気系に還流する排気（以下「ＥＧＲガス」という）を冷却するＥＧＲクーラとして、伝熱管を利用したＥＧＲクーラが開示されている（特許文献１参照）。 An EGR cooler using a heat transfer tube is disclosed as an EGR cooler that cools exhaust gas (hereinafter referred to as “EGR gas”) that recirculates from the exhaust system of the engine to the intake system (see Patent Document 1).
このＥＧＲクーラは、冷却媒体が出入りする筒体の冷却媒体入口から冷却媒体出口へエンジン冷却水等の冷却媒体を流通させつつ伝熱管内にＥＧＲガスを通過させることによって、ＥＧＲガスと冷却媒体とが熱交換をするように構成されている。
ＥＧＲガスと冷却媒体との熱交換時、伝熱管は、ＥＧＲガスや冷却媒体の温度に応じて主に筒体の中心軸方向に熱膨張しようとする。しかしながら、筒体と伝熱管とはエンドプレートを介してろう付けや溶接等によって固着されているので、軸方向に同じ長さしか伸縮できない。 During heat exchange between the EGR gas and the cooling medium, the heat transfer tube tends to thermally expand mainly in the direction of the central axis of the cylinder according to the temperature of the EGR gas or the cooling medium. However, since the cylindrical body and the heat transfer tube are fixed by brazing, welding, or the like via the end plate, only the same length can be expanded and contracted in the axial direction.
したがって、ＥＧＲガスと冷却媒体との温度差や、筒体と伝熱管との線膨張係数の違いにより、筒体と伝熱管とで軸方向に伸縮しようとする量、つまり熱膨張量に差が生じる。そして、その熱膨張差の分だけ伸縮が抑制されて、伝熱管とエンドプレートとの固着部やエンドプレートと筒体との固着部に熱応力が発生し、この熱応力が材料に応じた許容応力より大きくなると、これらの部位に亀裂が発生する虞がある。 Therefore, due to the temperature difference between the EGR gas and the cooling medium and the difference in linear expansion coefficient between the cylinder and the heat transfer tube, there is a difference in the amount of expansion and contraction in the axial direction between the cylinder and the heat transfer tube, that is, the amount of thermal expansion. Arise. The expansion and contraction is suppressed by the difference in thermal expansion, and thermal stress is generated in the fixing part between the heat transfer tube and the end plate and the fixing part between the end plate and the cylinder, and this thermal stress is allowed depending on the material. If it is greater than the stress, cracks may occur in these parts.
そこで、本発明は以上のような従来の問題点に鑑み、伝熱管とエンドプレートとの固着部やエンドプレートと筒体との固着部での熱膨張差を許容し、これらの部位に亀裂が発生することを防止するＥＧＲクーラを提供することを目的とする。 Therefore, in view of the conventional problems as described above, the present invention allows a difference in thermal expansion at the fixing portion between the heat transfer tube and the end plate and the fixing portion between the end plate and the cylinder, and cracks are generated at these portions. It aims at providing the EGR cooler which prevents generating.
第１の発明は、ＥＧＲガスが流通する冷却管と、前記冷却管が内部に設置されるとともに、前記冷却管の周囲に冷媒が導入される筒状のシェルと、前記冷却管の両端部を前記シェルに支持するプレートと、ＥＧＲガスが導入され、前記冷却管へ導く入口ガイド部と、前記冷却管からＥＧＲガスが導入され、下流部へ導く出口ガイド部と、を備え、前記プレートの少なくとも一方は、薄厚鋼板からなり、前記シェルの中心軸方向に弾性変形可能な弾性部材に構成され、前記冷却管が前記シェルに対して前記弾性部材を介して相対変位可能に支持されることを特徴とするＥＧＲクーラである。 According to a first aspect of the present invention, there is provided a cooling pipe through which EGR gas flows, a cylindrical shell in which the cooling pipe is installed, a refrigerant is introduced around the cooling pipe, and both ends of the cooling pipe. A plate supported by the shell, an inlet guide portion into which EGR gas is introduced and led to the cooling pipe, and an outlet guide portion into which EGR gas is introduced from the cooling pipe and led to the downstream portion, and at least of the plate One is made of a thin steel plate, and is constituted by an elastic member that can be elastically deformed in the central axis direction of the shell, and the cooling pipe is supported relative to the shell through the elastic member so as to be relatively displaceable. EGR cooler.
第２の発明は、第１の発明において、前記プレートは、前記冷却管が貫通する孔部が形成され、前記孔部にフランジ部が形成され、前記フランジ部と前記冷却管との接触面が結合されることを特徴とするＥＧＲクーラである。 According to a second invention, in the first invention, the plate is formed with a hole through which the cooling pipe penetrates, a flange is formed in the hole, and a contact surface between the flange and the cooling pipe is formed. It is an EGR cooler characterized by being combined .
第３の発明は、第１または第２の発明において、前記弾性部材は、前記冷却管を取り囲むように凹状の溝部を形成し、前記シェルの中心軸方向に弾性変形可能に構成されることを特徴とするＥＧＲクーラである。 The third invention is the first or second aspect, the elastic member, the concave groove is formed so as to surround the cooling tube, the elastically deformable configured in the direction of the central axis of the shell It is a featured EGR cooler.
第１の発明〜第３の発明によれば、シェルと冷却管との間の熱膨張差を弾性部材が吸収するため、熱膨張差に起因した熱応力を低減し、シェルと冷却管との間や冷却管とプレート間の連結部での亀裂の発生を抑制することができる。 According to the first to third inventions , since the elastic member absorbs the thermal expansion difference between the shell and the cooling pipe, the thermal stress caused by the thermal expansion difference is reduced, and the shell and the cooling pipe Generation of cracks at the connection between the cooling pipe and the plate can be suppressed.
第３の発明によれば、弾性部材を容易に形成することができる。 According to the third invention, the elastic member can be easily formed.
図１は本発明のＥＧＲクーラの構成を示す断面図である。 FIG. 1 is a cross-sectional view showing a configuration of an EGR cooler according to the present invention.
ＥＧＲクーラは、ＥＧＲガスが導入される導入部と、ＥＧＲガスと冷却媒体（以下、冷媒という。）との間で熱交換が行われる熱交換部と、熱交換により冷却されたＥＧＲガスが排出される排出部とから構成される。 The EGR cooler discharges an EGR gas cooled by heat exchange, an introduction portion into which EGR gas is introduced, a heat exchange portion in which heat exchange is performed between the EGR gas and a cooling medium (hereinafter referred to as a refrigerant). And a discharge section.
導入部は、ＥＧＲガスが導入され、熱交換部へ導く略半椀状の入口ガイド部１０と、この入口ガイド部１０に固定され、ＥＧＲクーラを相手部品に取り付けるためのフランジ１１から構成される。 The introduction part is composed of a substantially semi-cylindrical inlet guide part 10 to which EGR gas is introduced and led to the heat exchange part, and a flange 11 fixed to the inlet guide part 10 for attaching the EGR cooler to the counterpart part. .
熱交換部は、入口ガイド部１０に固定される円筒状のシェル２０と、このシェル内にシェルの中心軸方向に略平行に配置される複数のパイプ状の冷却管２１と、複数の冷却管２１が貫通し、冷却管２１の両端部近傍を支持するとともに、シェル２０の内壁に連結してシェル２０内を密閉するプレート２２ａ、２２ｂとから構成される。 The heat exchange unit includes a cylindrical shell 20 fixed to the inlet guide unit 10, a plurality of pipe-shaped cooling pipes 21 disposed substantially parallel to the center axis direction of the shell in the shell, and a plurality of cooling pipes 21 is formed of plates 22a and 22b that pass through and support the vicinity of both ends of the cooling pipe 21, and are connected to the inner wall of the shell 20 to seal the inside of the shell 20.
シェル２０には、さらにプレート２２ａ、２２ｂにより密閉されたシェル２０内の冷却室２５に冷媒を導入する冷媒入口部２３と、冷媒が冷却室２５から排出される冷媒出口部２４とが備えられる。 The shell 20 is further provided with a refrigerant inlet 23 for introducing the refrigerant into the cooling chamber 25 in the shell 20 sealed by the plates 22 a and 22 b, and a refrigerant outlet 24 for discharging the refrigerant from the cooling chamber 25.
排出部は、シェル２０に固定されるとともに、冷却管２１からＥＧＲガスが導入され、下流部へ導く略半椀状の出口ガイド部３０と、この出口ガイド部３０に固定され、ＥＧＲクーラを相手部品に取り付けるためのフランジ３１から構成される。 The discharge part is fixed to the shell 20, EGR gas is introduced from the cooling pipe 21, and is fixed to the substantially semi-circular outlet guide part 30 that leads to the downstream part, and the outlet guide part 30. It is comprised from the flange 31 for attaching to components.
このような構成を有するＥＧＲクーラの作用を説明する。 The operation of the EGR cooler having such a configuration will be described.
導入部に導入されたＥＧＲガスは、導入部に開口する各冷却管２１内に流れ込み、冷却管２１内を流通する。密閉されたシェル２０内には冷媒、例えばエンジン冷却水が冷媒入口部２３から導入され、ＥＧＲガスが冷却管２１内を流通する間に、シェル２０内に充填された冷媒との間で熱交換が行われ、ＥＧＲガスは熱を冷媒に吸熱される。そして放熱したＥＧＲガスは、排出部から下流側へと排出される。 The EGR gas introduced into the introduction part flows into each cooling pipe 21 that opens to the introduction part, and flows through the cooling pipe 21. A refrigerant, for example, engine cooling water, is introduced into the sealed shell 20 from the refrigerant inlet 23 and heat exchange is performed with the refrigerant filled in the shell 20 while the EGR gas flows through the cooling pipe 21. The EGR gas absorbs heat from the refrigerant. The radiated EGR gas is discharged from the discharge portion to the downstream side.
次に本発明の特徴的な構成について図１を用いて説明する。 Next, a characteristic configuration of the present invention will be described with reference to FIG.
本発明は、ＥＧＲクーラの冷却管２１とシェル２０との間での温度差に起因する熱膨張差を吸収することを目的としている。そこで、本発明では少なくとも一方のプレート２２ａ、２２ｂとシェル２０との間に弾性変形可能な弾性部材４０を配置することを特徴とする。 The object of the present invention is to absorb a difference in thermal expansion caused by a temperature difference between the cooling pipe 21 and the shell 20 of the EGR cooler. Therefore, the present invention is characterized in that an elastic member 40 that is elastically deformable is disposed between at least one of the plates 22 a and 22 b and the shell 20.
図１によれば、シェル２０と下流側のプレート２２ｂ間に配置される弾性部材４０は、環状の部材であり、例えば薄厚ステンレス鋼板にて形成される。そして、この鋼板にシェル２０の中心軸方向に開口する凹状の環状溝４１を複数設置された冷却管２１を取り囲むように形成する。弾性部材４０は、シェル２０及びプレート２２ｂにロウ付けや溶接等により固定される。なお、本実施形態においては、弾性部材４０を一方のプレート２２ｂとシェル２０間に配置したが、双方に配置するようにしてもよい。 According to FIG. 1, the elastic member 40 disposed between the shell 20 and the downstream plate 22b is an annular member, and is formed of, for example, a thin stainless steel plate. Then, a concave annular groove 41 that opens in the direction of the central axis of the shell 20 is formed on the steel plate so as to surround the cooling pipes 21 that are installed. The elastic member 40 is fixed to the shell 20 and the plate 22b by brazing or welding. In the present embodiment, the elastic member 40 is disposed between the one plate 22b and the shell 20, but may be disposed on both.
このような構成により、弾性部材４０は、シェル２０の中心軸方向に弾性変形可能に形成される。そして、弾性部材４０をシェル２０とプレート２２ｂ間に配置することにより、ＥＧＲガスと冷媒との間での熱交換に伴って生じるシェル２０と冷却管２１との間の熱膨張差を弾性部材４０が吸収できる。このため、熱膨張差に起因する熱応力の発生を抑制し、シェル２０とプレート２２ａ、２２ｂとの間、あるいはプレート２２ａ、２２ｂと冷却管２１との間の固定部の亀裂の発生を防ぐことができる。 With such a configuration, the elastic member 40 is formed to be elastically deformable in the central axis direction of the shell 20. Then, by disposing the elastic member 40 between the shell 20 and the plate 22b, a difference in thermal expansion between the shell 20 and the cooling pipe 21 caused by heat exchange between the EGR gas and the refrigerant is determined by the elastic member 40. Can be absorbed. For this reason, generation | occurrence | production of the thermal stress resulting from a thermal expansion difference is suppressed, and generation | occurrence | production of the crack of the fixing | fixed part between the shell 20 and plate 22a, 22b or between plate 22a, 22b and the cooling pipe 21 is prevented. Can do.
また弾性部材４０は、薄厚鋼板に凹状の環状溝を、例えばプレス加工により形成するという簡単な手段により弾性変形可能に形成することができる。 Further, the elastic member 40 can be formed to be elastically deformable by a simple means of forming a concave annular groove in a thin steel plate by, for example, pressing.
図２は、本発明のＥＧＲクーラの第２の実施形態の構成を示す断面図である。 FIG. 2 is a cross-sectional view showing the configuration of the second embodiment of the EGR cooler of the present invention.
この実施形態は、第１の実施形態に対してプレート自体が弾性変形可能に構成される点に特徴を有する。弾性プレート５０は、図２に示すように薄厚円板状の部材であり、冷却管２１が貫通する複数の孔部５１が形成される。孔部５１にはフランジ部５２が形成され、冷却管２１とフランジ部５２との接触面積が大きくなり、ロウ付け等による冷却管２１とフランジ部５２との結合を確実にする。 This embodiment is characterized in that the plate itself is configured to be elastically deformable with respect to the first embodiment. The elastic plate 50 is a thin disk-shaped member as shown in FIG. 2, and a plurality of holes 51 through which the cooling pipe 21 passes are formed. A flange 52 is formed in the hole 51, and the contact area between the cooling pipe 21 and the flange 52 is increased, and the coupling between the cooling pipe 21 and the flange 52 by brazing or the like is ensured.
弾性プレート５０は、第１の実施形態の弾性部材４０と同様の凹部５３を備えて、シェル２０の中心軸方向の弾性変形を可能としている。 The elastic plate 50 includes a concave portion 53 similar to the elastic member 40 of the first embodiment, and enables elastic deformation in the central axis direction of the shell 20.
このような弾性プレート５０を備えることにより、第１の実施形態と同様の効果を奏するとともに、弾性部材を廃止することができるため、部品点数の削減、コストの低減、軽量化を図ることができる。 By providing such an elastic plate 50, the same effects as those of the first embodiment can be obtained, and the elastic member can be eliminated, so that the number of parts, the cost, and the weight can be reduced. .
なお、本実施形態の弾性プレート５０を用いて冷却管２１の両端部を支持するようにしてもよい。 In addition, you may make it support the both ends of the cooling pipe 21 using the elastic plate 50 of this embodiment.
以上説明した実施形態に限定されることなく、その技術的思想の範囲内において種々の変形や変更が可能であり、それらも本発明と均等であることは明白である。 The present invention is not limited to the embodiment described above, and various modifications and changes can be made within the scope of the technical idea, and it is obvious that these are equivalent to the present invention.
１０：入口ガイド部
１１：フランジ
２０：シェル
２１：冷却管
２２ａ、２２ｂ：プレート
２３：冷媒入口部
２４：冷媒出口部
３０：出口ガイド部
３１：フランジ
４０：弾性部材
４１：環状溝
５０：弾性部材
５１：孔部
５２：フランジ部
５３：凹部
DESCRIPTION OF SYMBOLS 10: Inlet guide part 11: Flange 20: Shell 21: Cooling pipe 22a, 22b: Plate 23: Refrigerant inlet part 24: Refrigerant outlet part 30: Outlet guide part 31: Flange 40: Elastic member 41: Annular groove 50: Elastic member 51: Hole 52: Flange 53: Recess
Claims (3)
前記冷却管が内部に設置されるとともに、前記冷却管の周囲に冷媒が導入される筒状のシェルと、
前記冷却管の両端部を前記シェルに支持するプレートと、
ＥＧＲガスが導入され、前記冷却管へ導く入口ガイド部と、
前記冷却管からＥＧＲガスが導入され、下流部へ導く出口ガイド部と、
を備え、
前記プレートの少なくとも一方は、薄厚鋼板からなり、前記シェルの中心軸方向に弾性変形可能な弾性部材に構成され、前記冷却管が前記シェルに対して前記弾性部材を介して相対変位可能に支持されることを特徴とするＥＧＲクーラ。 A cooling pipe through which EGR gas flows;
A cylindrical shell in which the cooling pipe is installed and a refrigerant is introduced around the cooling pipe;
A plate for supporting both ends of the cooling pipe on the shell ;
An inlet guide portion into which EGR gas is introduced and led to the cooling pipe;
EGR gas is introduced from the cooling pipe, and an outlet guide part that leads to the downstream part;
With
At least one of the plates is made of a thin steel plate, is configured as an elastic member that can be elastically deformed in the central axis direction of the shell, and the cooling pipe is supported to be relatively displaceable with respect to the shell via the elastic member. An EGR cooler characterized by that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007052786A JP4939980B2 (en) | 2007-03-02 | 2007-03-02 | EGR cooler |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2007052786A JP4939980B2 (en) | 2007-03-02 | 2007-03-02 | EGR cooler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2008215161A JP2008215161A (en) | 2008-09-18 |
| JP4939980B2 true JP4939980B2 (en) | 2012-05-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2010223193A (en) * | 2009-03-25 | 2010-10-07 | Komatsu Ltd | Egr cooler |
| JP5051212B2 (en) * | 2009-12-18 | 2012-10-17 | トヨタ自動車株式会社 | Exhaust cooler and exhaust gas recirculation device for internal combustion engine |
| DE102011018846A1 (en) | 2011-01-19 | 2012-07-19 | GETAS GESELLSCHAFT FüR THERMODYNAMISCHE ANTRIEBSSYSTEME MBH | Axial piston motor and method for operating an axial piston motor |
| JP5923886B2 (en) * | 2011-07-20 | 2016-05-25 | 株式会社デンソー | Exhaust cooling device |
| DE102011113788A1 (en) * | 2011-09-20 | 2013-03-21 | Friedrich Boysen Gmbh & Co. Kg | Heat transfer assembly |
| JP2017172831A (en) * | 2016-03-22 | 2017-09-28 | 株式会社デンソー | Adsorber |
| CN112097567A (en) * | 2020-09-24 | 2020-12-18 | 浙江银轮机械股份有限公司 | Connecting piece and heat exchanger for heat exchanger |
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| JPS5888570A (en) * | 1981-11-24 | 1983-05-26 | 松下電器産業株式会社 | Air conditioner |
| DE10218521A1 (en) * | 2002-04-25 | 2003-11-06 | Behr Gmbh & Co | Exhaust gas heat exchanger, especially for motor vehicles |
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| JP2008215161A (en) | 2008-09-18 |
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