JP5048695B2 - EGR cooler - Google Patents

EGR cooler Download PDF

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JP5048695B2
JP5048695B2 JP2009045584A JP2009045584A JP5048695B2 JP 5048695 B2 JP5048695 B2 JP 5048695B2 JP 2009045584 A JP2009045584 A JP 2009045584A JP 2009045584 A JP2009045584 A JP 2009045584A JP 5048695 B2 JP5048695 B2 JP 5048695B2
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exhaust gas
shielding member
inlet side
egr cooler
case
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JP2010196679A (en
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寛司 津田
泰生 大久保
和夫 古橋
恵市 稲葉
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Komatsu Ltd
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Komatsu Ltd
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Priority to JP2009045584A priority Critical patent/JP5048695B2/en
Priority to PCT/JP2010/052766 priority patent/WO2010098321A1/en
Priority to DE112010000919.8T priority patent/DE112010000919B4/en
Priority to CN201080009328XA priority patent/CN102333949A/en
Priority to US13/203,532 priority patent/US20110308778A1/en
Publication of JP2010196679A publication Critical patent/JP2010196679A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

本発明は、ＥＧＲ（Exhaust Gas Recirculation）クーラに関する。   The present invention relates to an EGR (Exhaust Gas Recirculation) cooler.

従来、ディーゼルエンジンに搭載されるＥＧＲシステムにおいては、給気側に戻す排気ガスを冷却するためのＥＧＲクーラが設けられることがある。ＥＧＲクーラは、排気ガスを流通させる複数のチューブと、これらのチューブが収容されるケース（シェルという場合もある）とを備え、ケースの一端側には冷却水を流入させる流入口が設けられ、他端側には冷却水を流出させる流出口が設けられている。   Conventionally, in an EGR system mounted on a diesel engine, an EGR cooler for cooling exhaust gas to be returned to the air supply side may be provided. The EGR cooler includes a plurality of tubes through which exhaust gas is circulated, and a case (also referred to as a shell) in which these tubes are accommodated, and an inflow port through which cooling water flows is provided at one end side of the case. On the other end side, an outlet for allowing the cooling water to flow out is provided.

また、ケースは筒状とされ、ケースの一端側の開口部分には排気ガスを流入させてチューブへと流す入口側タンクが設けられ、ケースの他端側の端部にはチューブからの排気ガスを流出させる出口側タンクが設けられている。このようなケース内においてチューブは、それぞれの端部がヘッダプレートに鑞付け等によって固着されており、該ヘッダプレートが溶接により、ケースの開口部分を塞ぐようにしてその内周面に固着されている。つまり、両端側がヘッダプレートで塞がれたケース内にあって、複数のチューブの外側を冷却水が流れ、チューブの内部を排気ガスが流れる。   In addition, the case has a cylindrical shape, and an inlet side tank is provided in the opening on one end side of the case to allow exhaust gas to flow into the tube, and the exhaust gas from the tube is provided at the other end of the case. An outlet side tank is provided for discharging the water. In such a case, each end of the tube is fixed to the header plate by brazing or the like, and the header plate is fixed to the inner peripheral surface by welding so as to close the opening of the case. Yes. That is, in the case where both end sides are closed by the header plate, the cooling water flows outside the plurality of tubes, and the exhaust gas flows inside the tubes.

ところで、入口側タンク内では、ヘッダプレートの一方の面、つまり入口側タンクに向いた面に高温の排気ガスが直接当たることになるため、ヘッダプレートとチューブとの鑞付け部分が排気ガスによって加熱されることになり、高温化して接合強度が低下し、鑞付け部分に亀裂が入るという問題がある。   By the way, in the inlet side tank, the hot exhaust gas directly hits one side of the header plate, that is, the side facing the inlet side tank, so the brazed portion between the header plate and the tube is heated by the exhaust gas. Therefore, there is a problem that the joint strength is lowered due to high temperature, and cracks are formed in the brazed portion.

そこで、このようなヘッダプレートに排気ガスが直接当たらないようにするために、ヘッダプレートと略同形状の遮蔽板をヘッダプレートの上流側に設け、この遮蔽板にまでチューブ端部を延設させる構造のＥＧＲクーラが提案されている（例えば、特許文献１）。 このような構造では、入口側タンクとケース内との間が２重構造となるため、入口側タンクに流入した高温の排気ガスがヘッダプレートに当たることがなく、チューブとの鑞付け部分が高温化するのを抑制できる。従って、そのような鑞付け部分に亀裂が入る心配がなく、ケース内の冷却水が漏れ出すのを防止できる。   Therefore, in order to prevent exhaust gas from directly hitting such a header plate, a shielding plate having substantially the same shape as the header plate is provided on the upstream side of the header plate, and the tube end is extended to this shielding plate. A structure EGR cooler has been proposed (for example, Patent Document 1). In such a structure, since the space between the inlet side tank and the inside of the case is a double structure, the high temperature exhaust gas flowing into the inlet side tank does not hit the header plate, and the brazed portion with the tube is heated. Can be suppressed. Therefore, there is no fear that such a brazed portion will crack, and the cooling water in the case can be prevented from leaking.

特開２０００−４５８８２号公報JP 2000-45882 A

しかしながら、前記公報記載のＥＧＲクーラでは、排気ガスが直に鑞付け部分に当たるのを防ぐことはできるものの、入口側タンクの周壁部（ボンネット）には依然として排気ガスが直に接触するため、入口側タンクとしては、周壁部が外方側へ大きく熱膨張してしまい、入口側タンクとこれが固着されるケースやヘッダプレートとの間において熱膨張差が生じることになる。つまり、ケースやヘッダプレートは、その大部分が常時冷却水と接触しているためにさほど高温にならず、熱膨張の度合いも小さいが、入口側タンクの周壁部は冷却水と接触することがなく、排気ガスとのみ接触するために熱膨張も著しい。   However, in the EGR cooler described in the above publication, although exhaust gas can be prevented from directly hitting the brazing portion, the exhaust gas is still in direct contact with the peripheral wall portion (bonnet) of the inlet side tank. As the tank, the peripheral wall portion is greatly expanded outward, and a difference in thermal expansion occurs between the inlet side tank and the case or header plate to which the inlet side tank is fixed. In other words, most of the case and header plate are always in contact with the cooling water, so the temperature is not so high and the degree of thermal expansion is small, but the peripheral wall of the inlet side tank may be in contact with the cooling water. In addition, the thermal expansion is significant because it is only in contact with the exhaust gas.

従って、入口側タンクとケースやヘッダプレートとの接合部分では、入口側タンクの著しい熱膨張により、ケースやヘッダプレートが外方側に変形し、この変形により結果として、ヘッダプレートとチューブとの接合部分に高応力が生じて亀裂が発生する。   Therefore, at the joint between the inlet side tank and the case or header plate, the case or header plate is deformed outward due to the significant thermal expansion of the inlet side tank. As a result, the joint between the header plate and the tube is caused by this deformation. High stress is generated in the part and cracks occur.

本発明の目的は、入口側タンクとの大きな熱膨張差による熱変形を抑制でき、亀裂が生じるのを防止できるＥＧＲクーラを提供することにある。   The objective of this invention is providing the EGR cooler which can suppress the thermal deformation by a big thermal expansion difference with an inlet side tank, and can prevent that a crack arises.

本発明のＥＧＲクーラは、内部を冷却水が流れるケースと、内部を排気ガスが流れ、前記ケース内に収容される複数のチューブと、前記複数のチューブの端部が接合されて前記ケースの端部に接合されるヘッダプレートと、排気ガスが入り込むように構成されて前記ケースの端部に接合される入口側タンクとを備え、前記入口側タンク内には、入り込んだ排気ガスを前記複数のチューブに案内することで当該入口側タンクの周壁部に接触しにくくする遮蔽部材が設けられ、前記遮蔽部材は、筒状であるとともに、前記入口側タンクの入口端部に一体とされた遮蔽部材の入口端部と、全ての前記チューブの入口側の全域に対応した出口側の開口面積を有する出口端部と、前記入口端部および前記出口端部をつなぐ周壁部とで構成され、前記遮蔽部材と前記ヘッダプレートとの間には、当該遮蔽部材の熱膨張時の前記ヘッダプレートへの接触を回避し、かつ前記入口側タンクの周壁部への排気ガスの回り込みが生じないほどの隙間が形成されていることを特徴とする。 The EGR cooler according to the present invention includes a case in which cooling water flows inside, a plurality of tubes in which exhaust gas flows and inside the case, and ends of the plurality of tubes joined to each other. A header plate that is joined to the portion, and an inlet side tank that is configured to allow exhaust gas to enter and is joined to an end portion of the case . A shielding member that makes it difficult to come into contact with the peripheral wall portion of the inlet side tank by being guided to the tube is provided, and the shielding member has a cylindrical shape and is integrally formed with the inlet end portion of the inlet side tank. The inlet end portion of the tube, an outlet end portion having an opening area on the outlet side corresponding to the entire area of the inlet side of all the tubes, and a peripheral wall portion connecting the inlet end portion and the outlet end portion. Between the material and the header plate, there is a gap that avoids contact with the header plate during thermal expansion of the shielding member and does not cause exhaust gas to wrap around the peripheral wall portion of the inlet side tank. It is formed .

本発明のＥＧＲクーラでは、前記遮蔽部材は、排気ガスの出口側に向けて拡開して設けられていることを特徴とする。   In the EGR cooler of the present invention, the shielding member is provided so as to expand toward the exhaust gas outlet side.

本発明のＥＧＲクーラにおいて、前記出口側端部は、排気ガスの流れ方向に沿って略等しい径寸法とされていることを特徴とする。 In the EGR cooler of the present invention, the outlet end is characterized that you are substantially equal diameter along the flow direction of the exhaust gas.

本発明によれば、入口側タンク内に遮蔽部材を設けるので、入口側タンク内に流入した高温の排気ガスは、入口側タンクの周壁部に接触しにくくなり、周壁部の外方側への熱膨張を抑制する。従って、入口側タンクと接合されるケースやヘッダプレートが入口側タンクの熱膨張に影響されないために、大きく変形する心配がなく、ヘッダプレートとチューブとの接合部分に大きな応力が生じるのを防止して、亀裂の発生を防ぐことができる。   According to the present invention, since the shielding member is provided in the inlet side tank, the high-temperature exhaust gas that has flowed into the inlet side tank is less likely to come into contact with the peripheral wall portion of the inlet side tank. Suppresses thermal expansion. Therefore, since the case and header plate joined to the inlet side tank are not affected by the thermal expansion of the inlet side tank, there is no fear of large deformation, and a large stress is prevented from being generated at the joint portion between the header plate and the tube. Thus, the generation of cracks can be prevented.

遮蔽部材を入口側タンクに設ける場合には、ヘッダプレートとチューブとで構成されるコアとしては、遮蔽部材が設けられないことで前後の勝手が同じになるので、前後の向きが決められているようなケースに対して、前後を誤って組み付ける心配がなく、組み立てを容易にできる。   When the shielding member is provided in the inlet side tank, the front / rear direction is determined because the core constituted by the header plate and the tube has the same front / rear direction by not providing the shielding member. For such cases, there is no need to worry about wrong assembly before and after, making assembly easier.

ここで、遮蔽部材とヘッダプレートとの間に隙間を設けることにより、遮蔽部材が排気ガスに触れて熱膨張しても、遮蔽部材とヘッダプレートとが接触するおそれがなく、ヘッダプレートが押圧されることによる応力発生を防止できる。   Here, by providing a gap between the shielding member and the header plate, even if the shielding member touches the exhaust gas and thermally expands, there is no possibility that the shielding member and the header plate come into contact with each other, and the header plate is pressed. Can prevent the occurrence of stress.

遮蔽部材の出口側の開口部分を全チューブの端部を覆う大きさとすれば、遮蔽部材から出た排気ガスを満遍なく各チューブに流入させることができ、排気ガスの冷却効率を向上させることができる。   If the opening on the outlet side of the shielding member is sized to cover the end of all the tubes, the exhaust gas emitted from the shielding member can be evenly flowed into each tube, and the exhaust gas cooling efficiency can be improved. .

遮蔽部材を出口側に向けて拡開させることにより、入口側タンクでの入口側の開口面積が小さく、出口側の開口面積が大きい場合でも、排気ガスを各チューブに確実に案内でき、やはり良好な冷却効率を実現できる。 By expanding the shielding member toward the outlet side, exhaust gas can be reliably guided to each tube even when the inlet side opening area in the inlet side tank is small and the outlet side opening area is large. Cooling efficiency can be realized.

遮蔽部材の出口側に拡散抑制用の出口端部を設ける場合には、排気ガスが拡がらずに各チューブに流入することになるので、排気ガスの流れがスムースになり、冷却効率を一層向上させることができる。   When an outlet end for suppressing diffusion is provided on the outlet side of the shielding member, the exhaust gas flows into each tube without spreading, so the flow of the exhaust gas becomes smoother and the cooling efficiency is further improved. Can be made.

本実施形態に係るＥＧＲクーラを排気ガスの流れ方向に沿って断面した断面図。The sectional view which cut the EGR cooler concerning this embodiment along the flow direction of exhaust gas. 図１のII−II線に沿った断面図。Sectional drawing along the II-II line of FIG. ＥＧＲクーラの要部を示す拡大図。The enlarged view which shows the principal part of an EGR cooler. ＥＧＲクーラに用いられる構成部品を示す図。The figure which shows the component used for an EGR cooler. 前記構成部品を示す断面斜視図。The cross-sectional perspective view which shows the said component. 本発明の変形例を示す断面図。Sectional drawing which shows the modification of this invention.

以下、本発明の一実施形態を図面に基づいて説明する。
図１は、本実施形態に係るＥＧＲクーラ１０を排気ガス（ハッチング矢印参照）の流れ方向に沿って断面した断面図。図２は、図１のII−II線に沿った断面図。図３は、ＥＧＲクーラ１０の要部を示す拡大図。図４は、ＥＧＲクーラ１０に用いられる構成部品を示す図、図５はその断面斜視図。なお、以下の説明において、前側とは、排気ガスの流れの上流側をいい、後側とは下流側をいう。また、左右とは、前側から見た場合の左右をいう。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of an EGR cooler 10 according to the present embodiment taken along the flow direction of exhaust gas (see hatching arrows). 2 is a cross-sectional view taken along line II-II in FIG. FIG. 3 is an enlarged view showing a main part of the EGR cooler 10. 4 is a diagram showing components used in the EGR cooler 10, and FIG. 5 is a cross-sectional perspective view thereof. In the following description, the front side refers to the upstream side of the exhaust gas flow, and the rear side refers to the downstream side. Moreover, left and right means right and left when viewed from the front side.

図１において、ＥＧＲクーラ１０は、円筒形状のケース１１と、ケース１１の内部に収容された排気ガス流通用の複数の偏平チューブ１２と、各チューブ１２の端部が接合された両側のヘッダプレート１３と、各ヘッダプレート１３を介してケース１１に接合された入口側タンク１４および出口側タンク１５とを備え、入口側タンク１４には流入口１６Ａを有した取付フランジ１６が、出口側タンク１５には流出口１７Ａを有した取付フランジ１７がそれぞれ設けられている。   In FIG. 1, an EGR cooler 10 includes a cylindrical case 11, a plurality of flat tubes 12 for circulating exhaust gas housed in the case 11, and header plates on both sides in which ends of the tubes 12 are joined. 13 and an inlet side tank 14 and an outlet side tank 15 joined to the case 11 via each header plate 13, and the inlet side tank 14 has a mounting flange 16 having an inlet 16 </ b> A. Each is provided with a mounting flange 17 having an outlet 17A.

ケース１１の一端側および他端側には、中央の胴体部分よりも径寸法の一回り大きい円筒形状の突部１８が形成されている。前側の突部１８の下方には、ケース１１内部に冷却水（白抜き矢印参照）を流入させる流入口２１が設けられ、後側の突部１８の上方には、ケース１１内の冷却水が流出する流出口２２が設けられている。また、冷却水の流入口２１側の突部１８において、その上部には、一対のガス抜き孔２３が周方向に所定角度離れて設けられている（図１に１つのみを図示）。   On one end side and the other end side of the case 11, a cylindrical protrusion 18 that is slightly larger in diameter than the central body portion is formed. An inflow port 21 through which cooling water (see a white arrow) flows into the inside of the case 11 is provided below the front protrusion 18, and the cooling water in the case 11 is above the rear protrusion 18. An outflow port 22 that flows out is provided. In addition, a pair of gas vent holes 23 are provided at an upper portion of the protrusion 18 on the cooling water inlet 21 side at a predetermined angle in the circumferential direction (only one is shown in FIG. 1).

図２において、並設された各チューブ１２の互いに対向する表面間の隙間は、冷却水が通る冷却水流路２４になっている。各冷却水流路２４は好ましくは全て同じ幅寸法に設定されている。チューブ１２が左右に並設されている本実施形態において、冷却水の流入口２１（図１）が突部１８の下方に位置しているのは、流入口２１からの冷却水が冷却水流路２４に即座に入り込むようにするためである。従って、そのような流入口２１は、本実施形態のように、突部１８の下方中央部に位置していることが好ましい。つまり、本実施形態では、流入口２１から流入した直後の冷却水の流れ方向と、各チューブ１２の上下方向が同一方向になっており、冷却水の流れが阻害されることがない。   In FIG. 2, the gap between the mutually facing surfaces of the tubes 12 arranged in parallel is a cooling water flow path 24 through which cooling water passes. All the cooling water channels 24 are preferably set to have the same width dimension. In the present embodiment in which the tubes 12 are arranged side by side, the cooling water inlet 21 (FIG. 1) is located below the protrusion 18 because the cooling water from the inlet 21 is the cooling water flow path. This is to make it immediately enter 24. Therefore, it is preferable that such an inflow port 21 is located in the lower center part of the protrusion 18 like this embodiment. That is, in this embodiment, the flow direction of the cooling water immediately after flowing in from the inlet 21 and the vertical direction of each tube 12 are the same direction, and the flow of the cooling water is not hindered.

また、本実施形態では、チューブ１２同士は、詳細な図示を省略するが、表面の一部が点状の突出部分で互いに鑞付けされているとともに、これらのチューブ１２の端部にヘッダプレート１３が鑞付けされている。そして、チューブ１２およびヘッダプレート１３を含んでコア２５が構成されている。   In the present embodiment, the tubes 12 are not shown in detail, but a part of the surface is brazed with a dot-like protruding portion, and the header plate 13 is attached to the end of these tubes 12. Is glazed. The core 25 includes the tube 12 and the header plate 13.

ＥＧＲクーラ１０を組み立てる際には、チューブ１２同士の鑞付けや、これへのヘッダプレート１３の鑞付けによりコア２５を予め製作しておき、このコア２５を上下または左右半割構造のケース体１１Ａ，１１Ｂからなるケース１１内に収容し、ケース体１１Ａ，１１Ｂ同士を溶接等で接合する。そして、ケース１１（ヘッダプレート１３）の端部に各タンク１４，１５を溶接等で取り付ける。   When assembling the EGR cooler 10, a core 25 is manufactured in advance by brazing the tubes 12 or by brazing the header plate 13 thereto, and the core 25 is made up of a case body 11A having an up-down or left-right halved structure. , 11B, and the case bodies 11A, 11B are joined together by welding or the like. And each tank 14 and 15 is attached to the edge part of case 11 (header plate 13) by welding.

この際、図３に拡大して示すように、ケース１１の開口端部１１１の内側にヘッダプレート１３の外周に形成された筒状部１３１が嵌め込まれ、この筒状部１３１のさらに内側に各タンク１４，１５の開口端部１４１，１５１が嵌め込まれ、これらが一体に溶接によって接合される。なお、本実施形態では、開口端部１１１，１４１，１５１および筒状部１３１の外形形状は円形ではなく、図４に入口側タンク１４の開口端部１４１を代表して示すように、僅かに四角形をなした異形形状とされている。   At this time, as shown in an enlarged view in FIG. 3, a cylindrical portion 131 formed on the outer periphery of the header plate 13 is fitted inside the opening end portion 111 of the case 11. The open end portions 141 and 151 of the tanks 14 and 15 are fitted, and these are joined together by welding. In the present embodiment, the outer shapes of the opening end portions 111, 141, 151 and the cylindrical portion 131 are not circular, and as shown in FIG. 4 representatively of the opening end portion 141 of the inlet side tank 14, It is an irregular shape that forms a square.

以下には、図１，４，５に基づき、本実施形態で用いられる入口側タンク１４について詳説する。入口側タンク１４は、取付フランジ１６の流入口１６Ａに嵌め込まれる筒状の入口端部１４２と、出口側を形成する前述の開口端部１４１と、これらの端部１４１，１４２同士をつなぐ周壁部１４３とで形成され、周壁部１４３が入口端部１４２から開口端部１４１側に向けて拡開した形状になっている。   Hereinafter, the inlet side tank 14 used in the present embodiment will be described in detail with reference to FIGS. The inlet side tank 14 has a cylindrical inlet end 142 fitted into the inlet 16A of the mounting flange 16, the aforementioned opening end 141 that forms the outlet side, and a peripheral wall that connects these ends 141 and 142 together. 143, and the peripheral wall portion 143 has a shape that expands from the inlet end portion 142 toward the opening end portion 141 side.

また、入口側タンク１４の内部には、流入した排気ガスが周壁部１４３の内面に接触しにくくする遮蔽部材１９が設けられている。遮蔽部材１９は、入口側タンク１４の入口端部１４２内に嵌め込まれて溶接される円筒状の入口端部１９２と、後方側に向けて開口した外形四角形状の出口端部１９１と、これらの端部１９１，１９２同士をつなぐ周壁部１９３とで形成されている。
ただし、出口端部１９１の外形形状は四角形状に限定されず、円形状等であってもよく、チューブ１２の断面形状や、コア２５の端部形状、あるいは入口側タンク１４の開口端部１４１の形状等を勘案して任意に決められてよい。 In addition, a shielding member 19 that prevents the inflowing exhaust gas from coming into contact with the inner surface of the peripheral wall portion 143 is provided inside the inlet side tank 14. The shielding member 19 includes a cylindrical inlet end 192 that is fitted into the inlet end 142 of the inlet side tank 14 and is welded, an outer rectangular outlet end 191 that opens toward the rear side, and these It is formed with the peripheral wall part 193 which connects edge part 191,192.
However, the outer shape of the outlet end portion 191 is not limited to a square shape, and may be a circular shape or the like. The cross-sectional shape of the tube 12, the end shape of the core 25, or the open end portion 141 of the inlet-side tank 14. It may be arbitrarily determined in consideration of the shape and the like.

出口端部１９１の開口面積は、並設された全チューブ１２の入口側の全域を覆う大きさとされ、流入した排気ガスが満遍なく各チューブ１２に流れ込むようになっている。出口端部１９１はまた、排気ガスの流れ方向に沿って（前後にわたって）径寸法が等しいストレートな筒状とされ、遮蔽部材１９から出た排気ガスを拡散させずに各チューブ１２に良好に流入させることが可能である。   The opening area of the outlet end portion 191 is large enough to cover the entire area on the inlet side of all the tubes 12 arranged side by side, and the exhaust gas that has flowed in flows into the tubes 12 evenly. The outlet end 191 is also a straight cylinder having the same diameter along the exhaust gas flow direction (front and rear), and flows into each tube 12 without diffusing the exhaust gas emitted from the shielding member 19. It is possible to make it.

このような出口端部１９１とヘッダプレート１３との間には、微小な隙間Ｓが形成されている（図１では、見易くするために誇張して大きく描かれている）。隙間Ｓは、排気ガスが入口側タンク１４の周壁部１４３側に回りこまないよう小さいほうがよく、また、排気ガスを各チューブ１２へスムースに流すためにも小さいほうがよい。そこで、本実施形態での隙間Ｓは、遮蔽部材１９が高温の排気ガスと接触して熱膨張した場合でも、遮蔽部材１９がヘッダプレート１３に接触することない範囲内でより小さく設定されている。   A small gap S is formed between the outlet end portion 191 and the header plate 13 (in FIG. 1, it is exaggerated and drawn for the sake of clarity). The clearance S should be small so that the exhaust gas does not flow around the peripheral wall 143 side of the inlet side tank 14, and it should be small so that the exhaust gas flows smoothly to each tube 12. Therefore, the gap S in this embodiment is set to be smaller within a range in which the shielding member 19 does not contact the header plate 13 even when the shielding member 19 contacts the high-temperature exhaust gas and thermally expands. .

周壁部１９３は、入口端部１９２から出口端部１９１側に向けて拡開している。つまり、出口端部１９１の開口面積は、入口端部１９２の開口面積よりも大きい。ただし、周壁部１９３としては、流入口１６Ａの大きさに応じた形状であってよく、例えば、流入口１６Ａの開口面積がより大きく、チューブ１２の図中の上下寸法と略同じ径寸法で開口している場合には、入口端部１９２や出口端部１９１と同形状のストレートな筒状に形成される。   The peripheral wall portion 193 is expanded from the inlet end portion 192 toward the outlet end portion 191 side. That is, the opening area of the outlet end 191 is larger than the opening area of the inlet end 192. However, the peripheral wall portion 193 may have a shape corresponding to the size of the inflow port 16A. For example, the opening area of the inflow port 16A is larger, and the diameter of the tube 12 is approximately the same as the vertical dimension in the drawing. In this case, it is formed in a straight cylindrical shape having the same shape as the inlet end 192 and the outlet end 191.

以上に説明した本実施形態のＥＧＲクーラ１０によれば、流入口１６Ａから入口側タンク１４内に流入した高温の排気ガスは、遮蔽部材１９に案内されることで周壁部１４３にほとんど接触することなく、各チューブ１２に流入する。各チューブ１２を流れる排気ガスは、ケース１１内でチューブ１２の外側を流れる冷却水で冷却され、出口側タンク１５に流出し、出口側タンク１５からエンジンの給気側に戻る。   According to the EGR cooler 10 of the present embodiment described above, the high-temperature exhaust gas flowing into the inlet side tank 14 from the inlet 16A is almost in contact with the peripheral wall 143 by being guided by the shielding member 19. Instead, it flows into each tube 12. The exhaust gas flowing through each tube 12 is cooled by the cooling water flowing outside the tube 12 in the case 11, flows out to the outlet side tank 15, and returns from the outlet side tank 15 to the supply side of the engine.

従って、入口側タンク１４内では、排気ガスが周壁部１４３に接触しにくくなるので、図３中に２点鎖線で示すような周壁部１４３の熱膨張を大幅に低減でき、ケース１１やヘッダプレート１３の変形を防止できる。そして、特にヘッダプレート１３の変形が防止されることにより、チューブ１２との接合部分での応力発生を抑制でき、外接合部分に亀裂が生じるのを防ぐことができる。   Accordingly, in the inlet side tank 14, the exhaust gas is less likely to come into contact with the peripheral wall portion 143, so that the thermal expansion of the peripheral wall portion 143 as shown by a two-dot chain line in FIG. 13 deformations can be prevented. In particular, by preventing the header plate 13 from being deformed, it is possible to suppress the generation of stress at the joint portion with the tube 12 and to prevent the outer joint portion from cracking.

なお、本発明は前述の実施形態に限定されるものではなく、本発明の目的を達成できる範囲での変形、改良等は本発明に含まれるものである。
例えば、前記実施形態では、入口側タンク１４、取付フランジ１６、および遮蔽部材１９とは互いに別体とされ、それぞれが溶接当で接合されていたが、図６に示すように、それぞれを鋳造により一体物として製造してもよい。 It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in the above-described embodiment, the inlet side tank 14, the mounting flange 16, and the shielding member 19 are separated from each other, and each is joined by welding, but as shown in FIG. It may be manufactured as a single piece.

前記実施形態では、遮蔽部材１９が入口側タンク１４に設けられていたが、ヘッダプレート１３に設けられていてもよい。
また、遮蔽部材１９の形状としては、前記実施形態のようなストレートな筒状の出口端部１９１がなく、後側が周壁部１４３をそのまま開口させた形状の場合も本発明に含まれる。ただし、出口端部１９１を設けることで、排気ガスの流れを各チューブ１２に向けて効率的に各チューブ１２に流入させることができるため、そうすることが好ましい。 In the embodiment, the shielding member 19 is provided in the inlet side tank 14, but may be provided in the header plate 13.
Further, the shape of the shielding member 19 includes the case where there is no straight cylindrical outlet end portion 191 as in the above-described embodiment, and the rear side has a shape in which the peripheral wall portion 143 is opened as it is. However, by providing the outlet end 191, the flow of exhaust gas can be efficiently flowed into each tube 12 toward each tube 12, so it is preferable to do so.

さらに、周壁部１９３の形状も任意であり、前記実施形態のように直線状に拡開した形状に限定されず、周壁部１９３全体が曲面で形成されるようにラウンドした形状であってもよく、その実施にあたって適宜な形状を適用できる。   Furthermore, the shape of the peripheral wall portion 193 is also arbitrary, and is not limited to a shape that is linearly expanded as in the above-described embodiment, and may be a shape that is round so that the entire peripheral wall portion 193 is formed with a curved surface. In the implementation, an appropriate shape can be applied.

前記実施形態では、本発明に係るチューブとして、偏平チューブ１２が用いられていたが、チューブとしては断面円形のチューブであってもよく、任意の形状のチューブを適用できる。そして、チューブが断面円形の場合には、遮蔽部材１９の出口端部１９１の形状も円形状とすることが好ましい。   In the said embodiment, although the flat tube 12 was used as a tube which concerns on this invention, a tube with a circular cross section may be used as a tube, and the tube of arbitrary shapes is applicable. And when a tube is circular in cross section, it is preferable that the shape of the exit end part 191 of the shielding member 19 is also circular.

その他、ヘッダプレート１３の形状も任意であり、前記実施形態のような筒状部１３１を有したものに限らない。つまり、平板状とされてその外周がケース１１の内周面に接合されていてもよい。このような場合でも、入口側タンク１４の周壁部１４３が熱膨張した場合には、ケース１１の変形に伴ってヘッダプレート１３も変形するおそれがあり、ヘッダプレート１３とチューブ１２との接合部分に大きな応力が生じる可能性があるため、本発明を適用して応力発生を防止することは有効である。   In addition, the shape of the header plate 13 is also arbitrary, and is not limited to the one having the cylindrical portion 131 as in the above embodiment. That is, it may be flat and the outer periphery thereof may be joined to the inner peripheral surface of the case 11. Even in such a case, when the peripheral wall portion 143 of the inlet side tank 14 is thermally expanded, the header plate 13 may also be deformed along with the deformation of the case 11, and the joint portion between the header plate 13 and the tube 12 may be deformed. Since large stress may be generated, it is effective to prevent the generation of stress by applying the present invention.

本発明は、ＥＧＲシステムを備えたエンジンが搭載される建設機械、輸送車両、各種産業機械に好適に適用できる。   The present invention can be suitably applied to construction machines, transportation vehicles, and various industrial machines on which an engine equipped with an EGR system is mounted.

１０…ＥＧＲクーラ、１１…ケース、１２…チューブ、１３…ヘッダプレート、１４…入口側タンク、１９…遮蔽部材、１９１…出口端部、Ｓ…隙間。   DESCRIPTION OF SYMBOLS 10 ... EGR cooler, 11 ... Case, 12 ... Tube, 13 ... Header plate, 14 ... Inlet side tank, 19 ... Shield member, 191 ... Outlet end, S ... Gap.

Claims (3)

ＥＧＲクーラにおいて、
内部を冷却水が流れるケースと、
内部を排気ガスが流れ、前記ケース内に収容される複数のチューブと、
前記複数のチューブの端部が接合されて前記ケースの端部に接合されるヘッダプレートと、
排気ガスが入り込むように構成されて前記ケースの端部に接合される入口側タンクとを備え、
前記入口側タンク内には、入り込んだ排気ガスを前記複数のチューブに案内することで当該入口側タンクの周壁部に接触しにくくする遮蔽部材が設けられ、
前記遮蔽部材は、筒状であるとともに、
前記入口側タンクの入口端部に一体とされた遮蔽部材の入口端部と、
全ての前記チューブの入口側の全域に対応した出口側の開口面積を有する出口端部と、
前記入口端部および前記出口端部をつなぐ周壁部とで構成され、
前記遮蔽部材と前記ヘッダプレートとの間には、当該遮蔽部材の熱膨張時の前記ヘッダプレートへの接触を回避し、かつ前記入口側タンクの周壁部への排気ガスの回り込みが生じないほどの隙間が形成されている
ことを特徴とするＥＧＲクーラ。 In the EGR cooler,
A case where cooling water flows inside,
Exhaust gas flows inside, a plurality of tubes accommodated in the case,
Header plates joined to the ends of the case by joining the ends of the plurality of tubes;
An inlet side tank configured to allow exhaust gas to enter and joined to an end of the case;
In the inlet side tank, a shielding member that makes it difficult to contact the peripheral wall portion of the inlet side tank by guiding the exhaust gas that has entered into the plurality of tubes is provided ,
The shielding member is cylindrical, and
The inlet end of the shielding member integrated with the inlet end of the inlet side tank;
An outlet end having an opening area on the outlet side corresponding to the entire area on the inlet side of all the tubes;
It is composed of a peripheral wall portion connecting the inlet end portion and the outlet end portion,
Between the shielding member and the header plate, contact with the header plate during thermal expansion of the shielding member is avoided, and exhaust gas does not wrap around the peripheral wall portion of the inlet side tank. An EGR cooler characterized in that a gap is formed . 請求項１に記載のＥＧＲクーラにおいて、
前記遮蔽部材は、排気ガスの出口側に向けて拡開して設けられている
ことを特徴とするＥＧＲクーラ。 The EGR cooler according to claim 1 ,
The EGR cooler, wherein the shielding member is provided to expand toward an exhaust gas outlet side. 請求項１または請求項２に記載のＥＧＲクーラにおいて、
前記出口側端部は、排気ガスの流れ方向に沿って略等しい径寸法とされている
ことを特徴とするＥＧＲクーラ。 In the EGR cooler according to claim 1 or 2 ,
The outlet side end portion, EGR cooler, characterized in that in the flow direction of the exhaust gas is substantially equal diameter.
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US20110308778A1 (en) 2011-12-22
CN102333949A (en) 2012-01-25
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DE112010000919B4 (en) 2014-07-03
WO2010098321A1 (en) 2010-09-02

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