JP2003184658A - Egr cooler - Google Patents
Egr coolerInfo
- Publication number
- JP2003184658A JP2003184658A JP2001381511A JP2001381511A JP2003184658A JP 2003184658 A JP2003184658 A JP 2003184658A JP 2001381511 A JP2001381511 A JP 2001381511A JP 2001381511 A JP2001381511 A JP 2001381511A JP 2003184658 A JP2003184658 A JP 2003184658A
- Authority
- JP
- Japan
- Prior art keywords
- egr cooler
- egr
- passage
- header tank
- cooling water
- 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
-
- 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
Landscapes
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明はエンジンのＥＧＲク
ーラに係り、特に、搭載位置の自由度を高くすることが
できるＥＧＲクーラに関するものである。
【０００２】
【従来の技術】吸気中に還流されるＥＧＲガスを冷却し
てエンジンの熱負荷を軽減するために、排気系と吸気系
を接続するＥＧＲ通路にエンジン冷却水が循環供給され
る水冷式のクーラを設けることがある。
【０００３】このようにＥＧＲガスを冷却する従来のＥ
ＧＲクーラは、ＥＧＲガスが流れるガス通路とエンジン
冷却水が循環供給される冷却通路を設けて両者を熱的に
結合したのみであった。ところで、エンジン冷却水に気
泡が混入すると冷却能力が低下する。従って、従来では
ＥＧＲクーラを例えばラジエータのアッパタンクより低
い位置に搭載してＥＧＲクーラで発生した気泡を分離す
る必要性があるなど、ＥＧＲクーラの搭載位置が制約さ
れてしまうという不具合があった。
【０００４】
【発明が解決しようとする課題】本発明は上記実情に鑑
みてなされたものであって、搭載位置の自由度が高いＥ
ＧＲクーラを提供することにより、スペース的に制約の
多い車載用エンジンなどに対するＥＧＲクーラの搭載性
を改善することを課題としている。
【０００５】
【課題を解決するための手段】上記課題を解決するため
に本発明は、排気系から分岐して吸気系に至るＥＧＲ通
路に設けたエンジン冷却水が循環供給される水冷式のＥ
ＧＲクーラの冷却水通路の頂部を、気水分離機能を有す
るヘッダタンクに接続したことを特徴としている。
【０００６】
【発明の実施の形態】以下に本発明の実施形態を図に基
づいて詳細に説明する。図１は本発明に係るＥＧＲクー
ラを備えた車載用エンジンの一実施形態を示す概略側面
図であり、いずれも図示省略した排気マニホールドから
分岐して吸気マニホールドに至るＥＧＲ通路にＥＧＲク
ーラ１を設けている。
【０００７】また、気水分離機能を有するヘッダタンク
３をＥＧＲクーラ１の上方に設け、該タンク３の底部と
前記ＥＧＲクーラ１における冷却水の通路の頂部を通路
４を介して接続することにより、ＥＧＲクーラ１の冷却
水通路に発生した気泡をヘッダタンク３に導入するよう
にしている。
【０００８】５はラジエータ２のアッパタンクとヘッダ
タンク３を接続する通路、６、７はエンジン８とラジエ
ータ２を接続する冷却水通路、９、１０は通路６、７を
ＥＧＲクーラ１に接続する冷却水通路であり、エンジン
８に内装した図示しないウォータポンプによる水の送給
作用を利用してラジエータ２とＥＧＲクーラ１の間でエ
ンジン冷却水が循環供給される水冷式のクーラで構成し
ている。１１はヘッダタンク３に設けた冷却水の補給口
である。
【０００９】上記のような構成になるＥＧＲクーラにお
いて、排気系から分流されて吸気系に還流されるＥＧＲ
ガスは、従来公知の水冷式のＥＧＲクーラの場合と同様
にＥＧＲクーラ１においてエンジン冷却水と熱交換され
て冷却される。ＥＧＲガスの冷却にともなって温度上昇
した冷却水は、ラジエータ２において大気との間で熱交
換されて温度が低下し、再びＥＧＲクーラ１に戻されて
ＥＧＲガスとの間で熱交換される。
【００１０】上記のようなＥＧＲクーラ１によるＥＧＲ
ガスの冷却に際して、ＥＧＲクーラの冷却水通路を流れ
る冷却水の温度が上昇すると気泡が発生してＥＧＲクー
ラ１の熱交換効率が低下する可能性がある。しかしなが
ら、気泡は冷却水よりも比重が小さくなっているため
に、発生した気泡は冷却水通路の頂部に溜り、通路４を
通ってヘッダタンク３に導入される。
【００１１】従って、ＥＧＲクーラ１をラジエータ２の
ヘッダタンクより高所に配した場合においても、ＥＧＲ
クーラ１の冷却水通路に気泡が滞留して熱交換効率を低
下させるおそれがなくなるために、ＥＧＲクーラ１の搭
載位置の自由度が高くなる。
【００１２】上記実施形態においてはＥＧＲクーラ１の
気水分離作用をするヘッダタンク３の底部にラジエータ
２のアッパタンクを接続することにより、共通のヘッダ
タンク３を用いてＥＧＲクーラ１、ラジエータ２および
エンジン８の気液分離作用を行なわせて部品点数の増加
を抑制するようにしているが、必ずしも上記実施形態の
ものに制限されない。
【００１３】すなわち、図２は本発明に係るＥＧＲクー
ラを備えた車載用エンジンの他の実施形態を示す概略側
面図である。本実施形態においては、前記実施形態の場
合と同様にＥＧＲクーラ１の真上部近傍にヘッダタンク
３を設けてＥＧＲクーラ１の冷却水通路の頂部とヘッダ
タンク３の底部を通路４を介して接続する一方、該ヘッ
ダタンク３とは別のヘッダタンク１２をラジエータ２の
アッパタンクの上方近傍に設けて両者を通路５を介して
接続している。
【００１４】従って、本実施形態のようにＥＧＲクーラ
１側のヘッダタンク３とラジエータ２およびエンジン８
側のヘッダタンク１２を別構成にした場合は、気泡が混
入した冷却水をヘッダタンク３、１２に誘導する通路
４、５を短縮することができるために、ＥＧＲクーラ１
の気液分離と、ラジエータ２およびエンジン８の気液分
離をそれぞれスムーズに行なわせることができる利点が
ある。
【００１５】また、１３はヘッダタンク３で分離された
気泡（空気）をヘッダタンク１１に誘導する通路であ
り、より高所に設けたヘッダタンク１２に冷却水の補給
口１１を設けているが、ヘッダタンク３をヘッダタンク
１２より高所に設ける場合は、ヘッダタンク３に冷却水
の補給口を設ければよく、ＥＧＲクーラ１とヘッダタン
ク３を一体化して通路４を省略することもできる。
【００１６】なお、実施形態ではいずれもＥＧＲクーラ
１の冷却水通路の頂部から延設した通路４の先端をヘッ
ダタンク３の底壁面に開口させているが、必ずしもヘッ
ダタンク３の底壁面に通路４を開口させる必要性はな
く、例えばヘッダタンク３の側壁の下端近傍に通路４を
開口させてもよい。
【００１７】
【発明の効果】以上の説明から明らかなように本発明
は、排気系から分岐して吸気系に至るＥＧＲ通路に設け
た水冷式のＥＧＲクーラの冷却水通路の頂部を、気水分
離機能を有するヘッダタンクの底部に接続したものであ
るから、従来のように例えばラジエータのヘッダタンク
などで気水分離させる必要性がなく、ＥＧＲクーラの搭
載位置の自由度が高くなる。Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an EGR cooler for an engine, and more particularly to an EGR cooler capable of increasing a degree of freedom of a mounting position. 2. Description of the Related Art In order to cool the EGR gas recirculated in intake air and reduce the heat load of the engine, a water cooling system in which engine cooling water is circulated and supplied to an EGR passage connecting an exhaust system and an intake system. A cooler of the formula may be provided. [0003] As described above, the conventional E for cooling the EGR gas is used.
The GR cooler has only a gas passage through which the EGR gas flows and a cooling passage through which the engine cooling water is circulated and supplied, and only thermally connects the two. By the way, when air bubbles are mixed in the engine cooling water, the cooling capacity is reduced. Therefore, in the related art, there is a problem that the mounting position of the EGR cooler is restricted, for example, it is necessary to mount the EGR cooler at a position lower than the upper tank of the radiator to separate bubbles generated in the EGR cooler. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a high degree of freedom in mounting position.
It is an object of the present invention to improve the mountability of an EGR cooler on an in-vehicle engine or the like having a large space constraint by providing a GR cooler. [0005] In order to solve the above-mentioned problems, the present invention provides a water-cooled E in which engine cooling water provided in an EGR passage branched from an exhaust system to an intake system is circulated and supplied.
The top of the cooling water passage of the GR cooler is connected to a header tank having a steam-water separating function. An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic side view showing an embodiment of an in-vehicle engine provided with an EGR cooler according to the present invention, and an EGR cooler 1 is provided in an EGR passage branching from an exhaust manifold (not shown) to an intake manifold. ing. A header tank 3 having a steam / water separation function is provided above the EGR cooler 1, and the bottom of the tank 3 is connected to the top of the cooling water passage in the EGR cooler 1 via a passage 4. The bubbles generated in the cooling water passage of the EGR cooler 1 are introduced into the header tank 3. Reference numeral 5 denotes a passage connecting the upper tank of the radiator 2 to the header tank 3, reference numerals 6 and 7 denote cooling water passages connecting the engine 8 and the radiator 2, and reference numerals 9 and 10 denote cooling which connects the passages 6 and 7 to the EGR cooler 1. The water passage is a water-cooled cooler in which engine cooling water is circulated and supplied between the radiator 2 and the EGR cooler 1 using a water supply action of a water pump (not shown) provided in the engine 8. . Reference numeral 11 denotes a cooling water supply port provided in the header tank 3. In the EGR cooler configured as described above, the EGR diverted from the exhaust system and returned to the intake system
The gas is cooled by exchanging heat with engine cooling water in the EGR cooler 1 as in the case of a conventionally known water-cooled EGR cooler. The cooling water whose temperature has risen due to the cooling of the EGR gas is heat-exchanged with the atmosphere in the radiator 2 to lower the temperature, returned to the EGR cooler 1 again, and exchanged with the EGR gas. EGR by the EGR cooler 1 as described above
When cooling the gas, when the temperature of the cooling water flowing through the cooling water passage of the EGR cooler rises, bubbles may be generated and the heat exchange efficiency of the EGR cooler 1 may be reduced. However, since the air bubbles have a lower specific gravity than the cooling water, the generated air bubbles accumulate at the top of the cooling water passage and are introduced into the header tank 3 through the passage 4. Therefore, even when the EGR cooler 1 is located higher than the header tank of the radiator 2,
Since there is no possibility that air bubbles stay in the cooling water passage of the cooler 1 to lower the heat exchange efficiency, the degree of freedom of the mounting position of the EGR cooler 1 is increased. In the above-mentioned embodiment, the EGR cooler 1, the radiator 2, and the engine are connected by using the common header tank 3 by connecting the upper tank of the radiator 2 to the bottom of the header tank 3 for separating water from the EGR cooler 1. Although the increase in the number of parts is suppressed by performing the gas-liquid separation operation of 8, the present invention is not necessarily limited to the above embodiment. FIG. 2 is a schematic side view showing another embodiment of a vehicle-mounted engine provided with an EGR cooler according to the present invention. In the present embodiment, the header tank 3 is provided just above the EGR cooler 1 and the top of the cooling water passage of the EGR cooler 1 and the bottom of the header tank 3 are connected via the passage 4 as in the case of the above embodiment. On the other hand, a header tank 12 different from the header tank 3 is provided near the upper part of the upper tank of the radiator 2 and both are connected via the passage 5. Therefore, as in the present embodiment, the header tank 3, the radiator 2, and the engine 8 on the EGR cooler 1 side are used.
If the header tank 12 on the side of the EGR cooler 1 is configured differently, the passages 4 and 5 for guiding the cooling water containing air bubbles to the header tanks 3 and 12 can be shortened.
And the gas-liquid separation of the radiator 2 and the engine 8 can be smoothly performed. Reference numeral 13 denotes a passage for guiding the bubbles (air) separated in the header tank 3 to the header tank 11, and a cooling water supply port 11 is provided in the header tank 12 provided at a higher position. When the header tank 3 is provided at a higher position than the header tank 12, a cooling water supply port may be provided in the header tank 3, and the EGR cooler 1 and the header tank 3 may be integrated and the passage 4 may be omitted. . In each of the embodiments, the end of the passage 4 extending from the top of the cooling water passage of the EGR cooler 1 is opened to the bottom wall surface of the header tank 3. There is no need to open the passage 4, for example, the passage 4 may be opened near the lower end of the side wall of the header tank 3. As is apparent from the above description, the present invention provides a water-cooled EGR cooler provided in an EGR passage branching from an exhaust system and leading to an intake system by using a water-cooled EGR cooler with a water-cooled EGR cooler. Since it is connected to the bottom of the header tank having the separating function, there is no need to separate air and water in a header tank of a radiator, for example, as in the conventional case, and the degree of freedom of the mounting position of the EGR cooler is increased.
【図面の簡単な説明】
【図１】本発明に係るＥＧＲクーラを備えた車載用エン
ジンの一実施形態を示す概略側面図である。
【図２】本発明に係るＥＧＲクーラを備えた車載用エン
ジンの他の実施形態を示す概略側面図である。
【符号の説明】
１ ＥＧＲクーラ
２ ラジエータ
３、１１ ヘッダタンク
４、５、６、７、９、１０ 通路
８ エンジンBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view showing an embodiment of a vehicle-mounted engine provided with an EGR cooler according to the present invention. FIG. 2 is a schematic side view showing another embodiment of a vehicle-mounted engine equipped with an EGR cooler according to the present invention. [Description of Signs] 1 EGR cooler 2 Radiator 3, 11 Header tank 4, 5, 6, 7, 9, 10 Passage 8 Engine
Claims (1)
通路にエンジン冷却水が循環供給される水冷式のＥＧＲ
クーラを設けたエンジンにおいて、気水分離機能を有す
るヘッダタンクを前記ＥＧＲクーラにおける冷却水の通
路の頂部に接続したことを特徴とするＥＧＲクーラ。Claims 1. An EGR that branches from an exhaust system to an intake system.
Water-cooled EGR in which engine coolant is circulated and supplied to the passage
In an engine provided with a cooler, an EGR cooler characterized in that a header tank having a steam-water separating function is connected to a top of a cooling water passage in the EGR cooler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001381511A JP2003184658A (en) | 2001-12-14 | 2001-12-14 | Egr cooler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001381511A JP2003184658A (en) | 2001-12-14 | 2001-12-14 | Egr cooler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003184658A true JP2003184658A (en) | 2003-07-03 |
Family
ID=27592161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001381511A Pending JP2003184658A (en) | 2001-12-14 | 2001-12-14 | Egr cooler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003184658A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006083709A (en) * | 2004-09-14 | 2006-03-30 | Hino Motors Ltd | Bleeding structure of cooling water |
| WO2006085024A1 (en) * | 2005-02-14 | 2006-08-17 | Peugeot Citroën Automobiles Sa. | Device for thermal control of recirculated gases in an internal combustion engine |
| JP2011231761A (en) * | 2010-04-24 | 2011-11-17 | Audi Ag | Valve mechanism for vent of coolant circuit of internal combustion engine |
-
2001
- 2001-12-14 JP JP2001381511A patent/JP2003184658A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006083709A (en) * | 2004-09-14 | 2006-03-30 | Hino Motors Ltd | Bleeding structure of cooling water |
| JP4488848B2 (en) * | 2004-09-14 | 2010-06-23 | 日野自動車株式会社 | Cooling air bleeding structure |
| WO2006085024A1 (en) * | 2005-02-14 | 2006-08-17 | Peugeot Citroën Automobiles Sa. | Device for thermal control of recirculated gases in an internal combustion engine |
| FR2882105A1 (en) * | 2005-02-14 | 2006-08-18 | Peugeot Citroen Automobiles Sa | DEVICE FOR THERMALLY REGULATING RECIRCULATED GASES OF AN INTERNAL COMBUSTION ENGINE |
| JP2011231761A (en) * | 2010-04-24 | 2011-11-17 | Audi Ag | Valve mechanism for vent of coolant circuit of internal combustion engine |
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