JP2008255970A - Exhaust gas recirculating device of v-type engine - Google Patents

Exhaust gas recirculating device of v-type engine Download PDF

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JP2008255970A
JP2008255970A JP2007102083A JP2007102083A JP2008255970A JP 2008255970 A JP2008255970 A JP 2008255970A JP 2007102083 A JP2007102083 A JP 2007102083A JP 2007102083 A JP2007102083 A JP 2007102083A JP 2008255970 A JP2008255970 A JP 2008255970A
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egr
exhaust gas
type engine
egr cooler
cylinder rows
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Shinichi Yamazawa
慎一 山澤
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Hino Motors Ltd
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Hino Motors Ltd
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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
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    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust gas recirculating (EGR) device for a V-type engine capable of reducing the vehicle weight and suppressing the costs through a decrease of the number of component parts and of saving the labor required for the installing operation by simplifying the piping system for supplying the cooling water and draining off. <P>SOLUTION: The EGR device of the V-type engine with a pair of cylinder rows 1 distributed on the left and right, includes an EGR cooler 3 which recirculates part of the exhaust gas 5 to the suction side upon cooling with water and is installed solely in a V-bank 2 pinched by the two cylinder rows 1, the exhaust gas 5 being led from the cylinder rows 1 and converged, wherein the EGR cooler 3 is extended in parallel with the direction in which the cylinder rows 1 are laid and is inclined and accommodated in such a fashion as assuming an up-gradient toward one side of the longitudinal direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、Ｖ型エンジンのＥＧＲ装置に関するものである。   The present invention relates to an EGR device for a V-type engine.

従来より、自動車のエンジンでは、排気側から排気ガスの一部を抜き出して吸気側へと戻し、その吸気側に戻された排気ガスでエンジン内での燃料の燃焼を抑制させて燃焼温度を下げることによりＮＯx（窒素酸化物）の発生を低減するようにした、いわゆる排気ガス再循環（ＥＧＲ：Exhaust Gas Recirculation）が行われている。   Conventionally, in an automobile engine, a part of exhaust gas is extracted from the exhaust side and returned to the intake side, and the exhaust gas returned to the intake side suppresses combustion of fuel in the engine to lower the combustion temperature. Thus, so-called exhaust gas recirculation (EGR) is performed in which generation of NOx (nitrogen oxide) is reduced.

一般的に、この種の排気ガス再循環を行う場合には、排気マニホールドから排気管に亘る排気通路の適宜位置と、吸気管から吸気マニホールドに亘る吸気通路の適宜位置との間をＥＧＲ系路により接続し、該ＥＧＲ系路を通して排気ガスを再循環するようにしている。   In general, when this type of exhaust gas recirculation is performed, an EGR system path is provided between an appropriate position of the exhaust passage extending from the exhaust manifold to the exhaust pipe and an appropriate position of the intake passage extending from the intake pipe to the intake manifold. The exhaust gas is recirculated through the EGR system path.

この際、エンジンに再循環する排気ガスをＥＧＲ系路の途中で冷却すると、排気ガスの温度が下がり且つその容積が小さくなることにより、エンジンの出力をあまり低下させずに燃焼温度を低下して効果的にＮＯxの発生を低減させることができる為、エンジンに排気ガスを再循環するＥＧＲ系路の途中に水冷式のＥＧＲクーラを装備したものがある。   At this time, if the exhaust gas recirculated to the engine is cooled in the middle of the EGR system path, the temperature of the exhaust gas decreases and the volume of the exhaust gas decreases, thereby reducing the combustion temperature without significantly reducing the output of the engine. In order to effectively reduce the generation of NOx, there are some equipped with a water-cooled EGR cooler in the middle of an EGR system for recirculating exhaust gas to the engine.

他方、自動車のエンジンには、クランクシャフトを中心に左右にＶ字型を成すように一対の気筒列を振り分けたＶ型エンジンと呼ばれるものがあるが、この種のＶ型エンジンにあっては、左右の気筒列毎にＥＧＲ系路が独立して設けられ、左右の気筒列における排気マニホールド上や吸気マニホールド上にＥＧＲクーラが個別に搭載されるようになっていた。   On the other hand, there is an automobile engine called a V-type engine in which a pair of cylinder rows are distributed so as to form a V-shape around the crankshaft. In this type of V-type engine, An EGR system path is independently provided for each of the left and right cylinder rows, and EGR coolers are individually mounted on the exhaust manifold and the intake manifold in the left and right cylinder rows.

尚、前述のＶ型エンジンに関連する先行技術文献情報としては、例えば、下記の特許文献１等が存在している。
特開２０００−１３０２７５号公報 As prior art document information related to the V-type engine described above, for example, the following Patent Document 1 exists.
JP 2000-130275 A

しかしながら、前述した如き左右の気筒列毎にＥＧＲクーラが個別に搭載された従来構造においては、部品点数が多くなることで車両重量の増加やコストの高騰を招くという問題があり、また、冷却水を給排するための配管系が複雑化して組み付け作業に要する手間が増えるという問題もあった。   However, in the conventional structure in which the EGR cooler is individually mounted for each of the left and right cylinder rows as described above, there is a problem in that the increase in the number of parts leads to an increase in the vehicle weight and an increase in cost. There is also a problem that the piping system for supplying and discharging the gas becomes complicated and the labor required for the assembly work increases.

本発明は上述の実情に鑑みてなしたもので、部品点数を減らして車両重量の軽減とコストの削減を実現し且つ冷却水を給排するための配管系を簡略化して組み付け作業に要する手間を省くことができるＶ型エンジンのＥＧＲ装置を提供することを目的とする。   The present invention has been made in view of the above-described circumstances, and reduces the number of parts to realize vehicle weight reduction and cost reduction, and simplifies the piping system for supplying and discharging cooling water, and the labor required for assembly work An object of the present invention is to provide an EGR device for a V-type engine that can eliminate the above.

本発明は、左右に一対の気筒列を振り分けたＶ型エンジンのＥＧＲ装置であって、左右の気筒列に挟まれたＶバンク内に、左右の気筒列から導いて合流した排気ガスの一部を水冷して吸気側へ再循環するＥＧＲクーラを単独で設けると共に、該ＥＧＲクーラを各気筒列の並び方向と平行に延在させ且つその長手方向の何れか一方に向け上り勾配を成すように傾斜させて収めたことを特徴とするものである。   The present invention is an EGR device for a V-type engine in which a pair of cylinder rows is distributed to the left and right, and a part of exhaust gas that is led from the left and right cylinder rows and merged in a V bank sandwiched between the left and right cylinder rows A single EGR cooler that cools the water and recirculates it to the intake side is provided, and the EGR cooler extends parallel to the direction in which the cylinder rows are arranged and has an upward gradient in one of the longitudinal directions. It is characterized by being tilted.

而して、このようにすれば、Ｖバンク内でＥＧＲクーラを傾斜させたことにより、気筒列の並び方向におけるＶバンクの長さ以上のＥＧＲクーラをＶバンク内に収めることが可能となり、従来の左右に分けられていたＥＧＲクーラを一つにまとめることで大幅に容量が増加したＥＧＲクーラのＶバンク内への配置を支障なく実現することが可能となる。   Thus, in this way, by tilting the EGR cooler in the V bank, it is possible to fit an EGR cooler in the V bank that is longer than the length of the V bank in the direction in which the cylinder rows are arranged. By combining the EGR coolers divided into left and right into one, it is possible to realize the arrangement of the EGR cooler having a significantly increased capacity in the V bank without any trouble.

この結果、左右の気筒列毎に二つずつ必要であったＥＧＲクーラ及びその関連部品が一つずつで賄えることになって部品点数の大幅な削減が図られ、しかも、ＥＧＲクーラが一つで済むことで冷却水の配管系も著しく簡略化されることになる。   As a result, two EGR coolers and two related parts needed for each of the left and right cylinder rows can be provided, and the number of parts can be greatly reduced. In addition, only one EGR cooler is required. As a result, the piping system of the cooling water is greatly simplified.

また、本発明においては、ＥＧＲクーラの上り側の端部とＶバンクの底部との間に所要の配置空間を確保し、該配置空間にＶ型エンジンの補機類を配置することが好ましく、このようにすれば、ＥＧＲクーラの上り側の端部とＶバンクの底部との間を補機類の配置空間として有効に活用することが可能となり、しかも、Ｖ型エンジンの補機類とＥＧＲクーラとの干渉を避け易くすることが可能となる。   Further, in the present invention, it is preferable to secure a required arrangement space between the upstream end portion of the EGR cooler and the bottom portion of the V bank, and to arrange V-type engine accessories in the arrangement space. In this way, it is possible to effectively utilize the space between the upstream end of the EGR cooler and the bottom of the V bank as an auxiliary equipment arrangement space, and the auxiliary equipment of the V-type engine and the EGR. It is possible to easily avoid interference with the cooler.

上記した本発明のＶ型エンジンのＥＧＲ装置によれば、下記の如き種々の優れた効果を奏し得る。   According to the EGR device of the V-type engine of the present invention described above, various excellent effects as described below can be obtained.

（Ｉ）本発明の請求項１に記載の発明によれば、従来の左右に分けられていたＥＧＲクーラを一つにまとめることで大幅に容量が増加したＥＧＲクーラのＶバンク内への配置を支障なく実現することができ、これにより部品点数を減らして車両重量の軽減とコストの削減を実現し且つ冷却水を給排するための配管系を簡略化して組み付け作業に要する手間を省くことができる。   (I) According to the invention described in claim 1 of the present invention, the arrangement of the EGR cooler, which has been increased in capacity by combining the conventional EGR cooler which has been divided into left and right, into the V bank, can be achieved. This reduces the number of parts, reduces the vehicle weight and costs, and simplifies the piping system for supplying and discharging cooling water, eliminating the labor required for assembly work. it can.

（ＩＩ）本発明の請求項２に記載の発明によれば、ＥＧＲクーラの上り側の端部とＶバンクの底部との間を補機類の配置空間として有効に活用することができると共に、Ｖ型エンジンの補機類とＥＧＲクーラとの干渉を避け易くすることができる。   (II) According to the invention described in claim 2 of the present invention, the space between the upstream end of the EGR cooler and the bottom of the V bank can be effectively used as an arrangement space for auxiliary equipment, Interference between auxiliary equipment of the V-type engine and the EGR cooler can be easily avoided.

以下本発明の実施の形態を図面を参照しつつ説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１及び図２は本発明を実施する形態の一例を示すもので、図１は左右に一対の気筒列を振り分けたＶ型エンジンの平面図、図２は図１のＩＩ−ＩＩ方向の矢視図を示している。   FIG. 1 and FIG. 2 show an example of an embodiment of the present invention. FIG. 1 is a plan view of a V-type engine in which a pair of cylinder rows is distributed to the left and right, and FIG. A view is shown.

ここに図示している例では、左右の気筒列１に挟まれたＶバンク２内にＥＧＲクーラ３が単独で設けられており、各気筒列１を抱持しているシリンダヘッド４から排出された排気ガス５が排気マニホールド６、排気管７、合流管８を介し集められ、その排気ガス５のうちの一部がＶバンク２内のＥＧＲクーラ３に導入されるように構成されている。   In the example shown here, an EGR cooler 3 is provided independently in the V bank 2 sandwiched between the left and right cylinder rows 1 and is discharged from the cylinder head 4 holding each cylinder row 1. The exhaust gas 5 is collected through the exhaust manifold 6, the exhaust pipe 7, and the junction pipe 8, and a part of the exhaust gas 5 is introduced into the EGR cooler 3 in the V bank 2.

即ち、前記ＥＧＲクーラ３は、各気筒列１の並び方向と平行に延在し且つその長手方向の何れか一方に向け上り勾配を成すように傾斜して収められており、その下り側の端部に前記合流管８の下部が接続されて排気ガス５の一部が導入されるようになっているが、排気ガス５の大半は前記合流管８の上部から図示しないターボチャージャへ向けて送られるようになっている。   In other words, the EGR cooler 3 extends in parallel with the direction in which the cylinder rows 1 are arranged and is inclined so as to form an upward gradient toward one of the longitudinal directions. The lower part of the merging pipe 8 is connected to the part so that a part of the exhaust gas 5 is introduced, but most of the exhaust gas 5 is sent from the upper part of the merging pipe 8 to a turbocharger (not shown). It is supposed to be.

ここで、前記ＥＧＲクーラ３は、下り側の端部に導入された排気ガス５を多数のチューブ９に分配して上り側の端部へと流し、前記各チューブ９を被包するシェル１０内に冷却水を給排して該冷却水と各チューブ９内の排気ガス５とを熱交換させるようにしてある。   Here, the EGR cooler 3 distributes the exhaust gas 5 introduced at the end on the downstream side to a number of tubes 9 and flows it to the end on the upstream side, and within the shell 10 that encloses each tube 9. The cooling water is supplied and discharged to exchange heat between the cooling water and the exhaust gas 5 in each tube 9.

尚、前記ＥＧＲクーラ３の上り側の端部には、排気側から吸気側へ再循環される排気ガス５の流量を制御するためのＥＧＲバルブ１１が装備されており、該ＥＧＲバルブ１１を経た排気ガス５が左右の気筒列１の図示しない吸気マニホールドや吸気管に振り分けられて再循環されるようになっている。   Note that an EGR valve 11 for controlling the flow rate of the exhaust gas 5 recirculated from the exhaust side to the intake side is provided at the upstream end of the EGR cooler 3, and passes through the EGR valve 11. The exhaust gas 5 is distributed and recirculated to intake manifolds and intake pipes (not shown) of the left and right cylinder rows 1.

また、特に本形態例においては、図２に示す如く、ＥＧＲクーラ３の上り側の端部とＶバンク２の底部（シリンダブロック１２の上部）との間に所要の配置空間１３が確保されており、該配置空間１３にサプライポンプ１４（Ｖ型エンジンの補機類）が配置されるようになっている。   In particular, in the present embodiment, as shown in FIG. 2, a required arrangement space 13 is secured between the upstream end of the EGR cooler 3 and the bottom of the V bank 2 (upper part of the cylinder block 12). A supply pump 14 (V-type engine accessory) is arranged in the arrangement space 13.

而して、このようにＶ型エンジンのＥＧＲ装置を構成すれば、Ｖバンク２内でＥＧＲクーラ３を傾斜させたことにより、気筒列１の並び方向におけるＶバンク２の長さ以上のＥＧＲクーラ３をＶバンク２内に収めることが可能となり、従来の左右に分けられていたＥＧＲクーラ３を一つにまとめることで大幅に容量が増加したＥＧＲクーラ３のＶバンク２内への配置を支障なく実現することが可能となる。   Thus, if the EGR device of the V-type engine is configured as described above, the EGR cooler 3 having a length equal to or larger than the length of the V bank 2 in the arrangement direction of the cylinder row 1 is obtained by inclining the EGR cooler 3 in the V bank 2. 3 can be stored in the V bank 2, and the EGR cooler 3, which has been divided into the conventional left and right EGR coolers 3, is greatly reduced in capacity, and the arrangement of the EGR cooler 3 in the V bank 2 is hindered. Can be realized without any problem.

この結果、左右の気筒列１毎に二つずつ必要であったＥＧＲクーラ３及びその関連部品（例えばＥＧＲバルブ１１等）が一つずつで賄えることになって部品点数の大幅な削減が図られ、しかも、ＥＧＲクーラ３が一つで済むことで冷却水の配管系も著しく簡略化されることになる。   As a result, the EGR cooler 3 and its related parts (for example, the EGR valve 11 etc.) required for each of the left and right cylinder rows 1 can be covered by one, and the number of parts can be greatly reduced. In addition, since only one EGR cooler 3 is required, the piping system of the cooling water is remarkably simplified.

従って、上記形態例によれば、従来の左右に分けられていたＥＧＲクーラ３を一つにまとめることで大幅に容量が増加したＥＧＲクーラ３のＶバンク２内への配置を支障なく実現することができ、これにより部品点数を減らして車両重量の軽減とコストの削減を実現し且つ冷却水を給排するための配管系を簡略化して組み付け作業に要する手間を省くことができる。   Therefore, according to the above-described embodiment, the arrangement of the EGR cooler 3 whose capacity has been greatly increased by combining the conventional EGR cooler 3 divided into the left and right can be realized without any trouble. As a result, the number of parts can be reduced, the vehicle weight can be reduced and the cost can be reduced, and the piping system for supplying and discharging the cooling water can be simplified and the labor required for the assembly work can be saved.

また、ＥＧＲクーラ３の上り側の端部とＶバンク２の底部との間に所要の配置空間１３を確保し、該配置空間１３にサプライポンプ１４を配置するようにしているので、ＥＧＲクーラ３の上り側の端部とＶバンク２の底部との間をサプライポンプ１４の配置空間１３として有効に活用することができ、しかも、サプライポンプ１４とＥＧＲクーラ３との干渉を避け易くすることができる。   In addition, since the required arrangement space 13 is secured between the upstream end of the EGR cooler 3 and the bottom of the V bank 2 and the supply pump 14 is arranged in the arrangement space 13, the EGR cooler 3 Can be effectively utilized as the arrangement space 13 of the supply pump 14 and the interference between the supply pump 14 and the EGR cooler 3 can be easily avoided. it can.

尚、本発明のＶ型エンジンのＥＧＲ装置は、上述の形態例にのみ限定されるものではなく、図示ではＥＧＲクーラの上り側の端部とＶバンクの底部との間にサプライポンプを配置した例で説明しているが、これ以外のＶ型エンジンの補機類を配置するようにしても良いこと、その他、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   Note that the EGR device for the V-type engine of the present invention is not limited to the above-described embodiment. In the drawing, a supply pump is disposed between the upstream end of the EGR cooler and the bottom of the V bank. Although described by way of example, other V-type engine accessories may be arranged, and other various modifications may be made without departing from the scope of the present invention. .

本発明を実施する形態の一例を示す平面図である。It is a top view which shows an example of the form which implements this invention. 図１のＩＩ−ＩＩ方向の矢視図である。It is an arrow view of the II-II direction of FIG.

符号の説明Explanation of symbols

１ 気筒列
２ Ｖバンク
３ ＥＧＲクーラ
５ 排気ガス
１３ 配置空間
１４ サプライポンプ（Ｖ型エンジンの補機類） 1 Cylinder row 2 V bank 3 EGR cooler 5 Exhaust gas 13 Space 14 Supply pump (auxiliaries for V-type engine)

Claims (2)

左右に一対の気筒列を振り分けたＶ型エンジンのＥＧＲ装置であって、左右の気筒列に挟まれたＶバンク内に、左右の気筒列から導いて合流した排気ガスの一部を水冷して吸気側へ再循環するＥＧＲクーラを単独で設けると共に、該ＥＧＲクーラを各気筒列の並び方向と平行に延在させ且つその長手方向の何れか一方に向け上り勾配を成すように傾斜させて収めたことを特徴とするＶ型エンジンのＥＧＲ装置。   This is an EGR device for a V-type engine in which a pair of cylinder rows are distributed to the left and right, and a part of the exhaust gas that is led from the left and right cylinder rows and merged in a V bank sandwiched between the left and right cylinder rows is water-cooled An EGR cooler that recirculates to the intake side is provided independently, and the EGR cooler extends parallel to the direction in which the cylinder rows are arranged, and is tilted so as to form an upward gradient toward one of the longitudinal directions. An EGR device for a V-type engine. ＥＧＲクーラの上り側の端部とＶバンクの底部との間に所要の配置空間を確保し、該配置空間にＶ型エンジンの補機類を配置したことを特徴とする請求項１に記載のＶ型エンジンのＥＧＲ装置。   The required arrangement space is ensured between the up end part of the EGR cooler and the bottom part of the V bank, and auxiliary equipment of the V-type engine is arranged in the arrangement space. V-type engine EGR device.
JP2007102083A 2007-04-09 2007-04-09 Exhaust gas recirculating device of v-type engine Withdrawn JP2008255970A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112016000073B4 (en) 2016-09-26 2020-08-06 Komatsu Ltd. EGR DEVICE AND TIPPER CONTAINING THIS

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112016000073B4 (en) 2016-09-26 2020-08-06 Komatsu Ltd. EGR DEVICE AND TIPPER CONTAINING THIS
US10808652B2 (en) 2016-09-26 2020-10-20 Komatsu Ltd. EGR apparatus and dump truck including the same

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