JP3775926B2 - EGR device - Google Patents

EGR device Download PDF

Info

Publication number
JP3775926B2
JP3775926B2 JP17456098A JP17456098A JP3775926B2 JP 3775926 B2 JP3775926 B2 JP 3775926B2 JP 17456098 A JP17456098 A JP 17456098A JP 17456098 A JP17456098 A JP 17456098A JP 3775926 B2 JP3775926 B2 JP 3775926B2
Authority
JP
Japan
Prior art keywords
egr
valve
egr cooler
passage
cooler
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.)
Expired - Fee Related
Application number
JP17456098A
Other languages
Japanese (ja)
Other versions
JP2000008973A (en
Inventor
幸夫 紺野
学 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UD Trucks Corp
Original Assignee
UD Trucks Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by UD Trucks Corp filed Critical UD Trucks Corp
Priority to JP17456098A priority Critical patent/JP3775926B2/en
Publication of JP2000008973A publication Critical patent/JP2000008973A/en
Application granted granted Critical
Publication of JP3775926B2 publication Critical patent/JP3775926B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

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 Silencers (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Description

【０００１】
【発明の属する技術分野】
この発明はエンジンのＥＧＲ装置に関する。
【０００２】
【従来の技術】
エンジンのＮＯｘ対策として排気の一部を吸気側に還流するＥＧＲ装置がよく知られている。このうち、還流ガス（ＥＧＲガス）の密度を高めるため、ＥＧＲガスを冷却するＥＧＲクーラを備えるものがある（特開平９ー１３７７５４号公報，特開平９ー２８０１１８号公報）。
【０００３】
その一例を説明すると、エンジンの排気通路を吸気通路に連通するＥＧＲ通路が設けられ、その通路途中に排気還流率（ＥＧＲ率）を制御するＥＧＲバルブと、ＥＧＲガスを冷却するＥＧＲクーラが介装される。
【０００４】
ＥＧＲクーラは、筒形の胴体とその内部を軸方向へ貫通する複数の冷却管とを備える熱交換器が使用され、各冷却管の回りに胴体で囲われる流路を経由してエンジンの冷却水が循環するように配管される。
【０００５】
ＥＧＲバルブが開くと、エンジンの排気の一部が還流され、ＥＧＲクーラが冷却水との間で熱交換を行うことにより、冷却管を通過するＥＧＲガスを冷却する。そのため、エンジンへの吸入空気量を確保しつつ、ＥＧＲ率を実質的に高めることができる。
【０００６】
【発明が解決しようとする課題】
このような従来例において、ＥＧＲクーラは冷却水の重みも加わるため、その取付部材（ブラケットなど）に高い支持剛性が要求される。また、ブラケットなどの取付部材を含めると、ＥＧＲクーラの組み付けに大きなスペースが独占されてしまうという不具合もあった。なお、エンジンのシリンダブロックにＥＧＲクーラを一体的に取り付けたものが知られている（特開平７ー４２６２８号公報，特開平１０ー２２５６号公報など）。
【０００７】
この発明は、このような課題の有効な対策手段の提供を目的とする。
【０００８】
【発明が解決しようとする課題】
第１の発明では、エンジンの排気を吸気側に環流するＥＧＲ通路と、その環流率を制御するＥＧＲバルブと、環流ガスを冷却するＥＧＲクーラと、を備えるＥＧＲ装置において、ＥＧＲクーラの出口部にその外周を跨ぐように形成される取付部と、取付部の両側に対応して排気マニホールド上に突設されるボス部と、を備えてなり、取付部の両側をそれぞれ対応するボス部に締め付けると共に、ＥＧＲクーラの入口部に一端が連結されるＥＧＲ通路の配管について、その他端を排気マニホールドに形成されるＥＧＲ通路との接合部に略水平な接合面を介して連結することにより、ＥＧＲクーラを排気マニホールド上でエンジンの前後方向へ沿う横置状態に組み付けたことを特徴とする。
【０００９】
第２の発明では、第１の発明において、ＥＧＲクーラにＥＧＲバルブを一体的に組み付けたことを特徴とする。
【００１１】
【発明の効果】
第１の発明では、エンジンに分岐管を介して結合される排気マニホールドをＥＧＲクーラの取付部材（ブラケットなど）として利用するので、ＥＧＲクーラの重量に耐える高い支持剛性が得られるほか、専用の取付部材（ブラケットなど）も不要のため、スペースやコストの面で有利となる。また、ＥＧＲクーラは、排気マニホールド上をエンジンの前後方向に沿ってコンパクトに組み付けられるため、エンジン周辺スペースを有効に活用できる。
【００１２】
また、ＥＧＲクーラは、排気マニホールド上の各ボス部およびＥＧＲ通路との接合部の３点でバランスよく支持される。
【００１３】
第３の発明では、ＥＧＲバルブもＥＧＲクーラを介して排気マニホールドに支持される。このため、ＥＧＲバルブを単独に支持する必要がなくなり、組付性も向上する。
【００１４】
【発明の実施の形態】
図１において、１０はエンジンの排気マニホールドであり、各シリンダに対応する分岐管１１とこれらの集合部１２とから形成される。各分岐管１１にシリンダヘッドとの取付部１１ａが形成され、集合部１２に排気管（図示せず）との接合部１２ａが形成される。１３はエンジンの排気を吸気側に還流するＥＧＲ通路であり、排気マニホールド１０の一端部にＥＧＲ通路１３との接合部１３ａが形成される。ＥＧＲ通路１３の途中には、ＥＧＲガス（還流ガス）を冷却するＥＧＲクーラ１４と、ＥＧＲ率（還流率）を制御するＥＧＲバルブ１９が介装される。
【００１５】
ＥＧＲクーラ１４は図２〜図４のように筒形の胴体１５とその内部を軸方向へ貫通する複数の冷却管１６とからなり、その回りに胴体１５で囲われる流路１７が形成され、冷却管１６を通過するＥＧＲガスとその回りの流路１７を通過する冷却水との間で熱交換を行うようになっている。１８ａ，１８ｂは冷却配管用の接続部であり、ＥＧＲガスの入口側と出口側に配置される。各接続部１８ａ，１８ｂに図示しないが、アイコネクタがアイボルトで締め付けられ、これらアイコネクタにエンジンの冷却水が胴体１５で囲われる流路１７を経由して循環するように配管される。
【００１６】
ＥＧＲクーラ１４の外周にこれを直交方向へ跨がる台座形の取付部２０が形成され、その両側に締付ボルト用の貫通穴２０ａが設けられる。排気マニホールド上１０には、取付部２０の貫通穴２０ａに対応するボス部２１が突設され、これらボス部２１に締付ボルト用のネジ穴（図示せず）が形成される。そして、ボス部２１に取付部２０を重ね、貫通穴２０ａを通して締付ボルト（図示せず）をネジ穴に螺合することにより、ＥＧＲクーラ１４は排気マニホールド１０上でエンジンの前後方向へ沿う横置きに取り付けられる。
【００１７】
図１において、２２はＥＧＲ通路１３の配管であり、その一端は排気マニホールド１０の接合部１３ａに連結される。ＥＧＲクーラ１４は前後にコネクタ２３，２４を備える。前側のコネクタ２３は、胴体１５の外周に大径開口部２２ａを介して嵌合され、反対側へ円筒形を絞ることにより、配管２２の径寸法に対応する小径開口部２２ｂが形成される。配管２２の他端に小径開口部２２ｂが連結され、コネクタ２２はその内側に配管２２からのＥＧＲガスを各分岐管１６へ拡散させる入口部２５を形成する。配管２２との接合部１３ａは、ボス部２１と共にＥＧＲクーラ１４の支持部を構成するよう、配管２２を介してＥＧＲクーラ１４の前部を支持する上向きの略水平な接合面に形成される。
【００１８】
後側のコネクタ２４は、両端が略同径に開口するストレートな円筒形に形成され、胴体１５の外周に一方の開口部２４ａを介して嵌合される。もう一方の開口部２４ｂにＥＧＲバルブ１９が一体的に組み付けられ、コネクタ２４はその内側に各分岐管からＥＧＲバルブ１９へＥＧＲガスをストレートに案内する出口部２６を形成する。なお、ＥＧＲクーラ１４の取付部２０は、コネクタ２４の外周に一体形成される。２７はエンジンの吸気通路（図示せず）に一端が接続するＥＧＲ通路１３の配管であり、その他端はＥＧＲバルブ１９の通路出口３２に接続される。
【００１９】
ＥＧＲバルブ１９は図５のようにハウジング３０の一側面に通路入口３１が、これと直交する側面に通路出口３２がそれぞれ開口され、これらを結ぶ湾曲通路３３が形成される。通路入口３１の接合面にＥＧＲクーラ１９の出口部２６が、同じく通路出口３２の接合面にＥＧＲ通路１３の配管２７がそれぞれ連結される。湾曲通路３０への直前（通路出口側）にバルブシート３４が形成され、そのシート面に対応するバルブヘッド３５ａを備えるポペット弁３５が設けられる。ポペット弁３５はハウジング３０にバルブステム３５ｂを介してバルブシート３４の開閉方向へ摺動自由に支持される。
【００２０】
３６はポペット弁３５を開閉するアクチュエータであり、エアシリンダ構造のものが採用される。シリンダに２つのエア配管用の接続部３６ａ，３６ｂが開口され、これらのそれぞれをエア圧発生源と継ぐ配管（図示せず）にポペット弁３５のストローク（開閉）を制御するバルブが設けられる。ＥＧＲバルブ１９において、ＥＧＲクーラ１４側の通路入口３１は、配管２７側の通路出口３２に較べて内径が大きくなり、通路途中に段差部３７を生じるが、バルブシート３４はこれを係止面に利用して組み付けられる。
【００２１】
ＥＧＲバルブ１９の熱負荷を低減するため、ハウジング３０の内部に湾曲通路３３およびポペット弁３５のバルブステム３５ｂを包むようにジャケット（図示せず）が形成される。４０ａ，４０ｂは配管用の接続部であり、ハウジング３０の側面に２つ配置される。各接続部４０ａ，４０ｂに図示しないが、アイコネクタがアイボルトで締め付けられ、これらアイコネクタにエンジンの冷却水がこのジャケットを経由して循環するように配管される。
【００２２】
このような構成により、ＥＧＲが行われると、ＥＧＲガスはＥＧＲクーラ１４およびＥＧＲバルブ１９を経由して吸気側へ供給される。ＥＧＲクーラ１４において、各冷却管１６の内部を通過するＥＧＲガスは、胴体１５の内部を流れる冷却水との熱交換により冷却され、ＥＧＲバルブ１９へ送り出される。この場合、ＥＧＲクーラ１４で冷却後のＥＧＲガスがＥＧＲバルブ１９を通過するため、ＥＧＲバルブの熱負荷を低減できる。また、ＥＧＲバルブは冷却後のＥＧＲガスが制御対象のため、エンジンの排気温度に大きく影響されることなく、ＥＧＲ率を安定的に精度よく制御できる。
【００２３】
ＥＧＲバルブ１９もハウジング３０のジャケットを通過する冷却水で熱負荷が低減されるため、高い信頼性と耐久性が得られる。この場合、ＥＧＲクーラ１４にＥＧＲバルブ１９を一体的に組み付けることにより、ＥＧＲクーラ１４とＥＧＲバルブ１９の間を配管で接続しなくて済むため、ＥＧＲ通路１３の配管作業は簡略化される。また、これらの支持手段（取付部２０とボス部２１など）も共用可能なため、組付性の向上が得られる。
【００２４】
ＥＧＲクーラ１４は胴体１５の内部に冷却水の流路１７も備えるので、ＥＧＲ通路１３の配管２２，２７に較べると、径寸法が大きくなるため、従来の場合は胴体１５の両端に絞り付きのコネクタが取り付けられる。この実施形態では、ＥＧＲクーラ１４の出口部２６とＥＧＲバルブ１９の通路入口３１が同径（図５のｄ寸法）になり、後側のコネクタ２４は絞りを持たないため、圧力損失の低下も得られる。
【００２５】
ＥＧＲバルブ１９の内部通路３３において、ＥＧＲクーラ１９側と配管２７側との径寸法の調整は、段差部３７で簡単に行える。段差部３７はバルブシート３４の係止面に利用されるため、その加工も無駄がなく、絞り付きのコネクタに較べると、コスト的にも有利となる。
【００２６】
ＥＧＲクーラ１４およびＥＧＲバルブ１９はブラケットなどに拠らず、排気マニホールド１０上に取り付け、その強度などを利用することにより、これら重量（冷却水の重みも加わる）に耐える高い支持剛性が得られる。また、２つのボス部２１および配管２２との接合部の３点でバランスよく支持される。ＥＧＲクーラ１４およびＥＧＲバルブ１９は、排気マニホールド１０上でこれに添うよう、コンパクトに組み付けられるため、エンジンの周辺スペースを有効に活用できる。
【００２７】
冷却水の配管について、エンジンの冷却水路（図示せず）に対し、ＥＧＲクーラ１４とＥＧＲバルブ１９は直列に介装される。ＥＧＲクーラ１４の入口側の接続部１８ａにエンジンの冷却水路の高圧側が、ＥＧＲクーラ１４の出口側の接続部１８ｂにＥＧＲバルブ１９の一方の接続部４０ａが、ＥＧＲバルブ１９のもう一方の接続部４０ｂにエンジンの冷却水の低圧側がそれぞれ配管される（図１参照）。
【００２８】
エンジンの冷却水はＥＧＲクーラ１４を通過し、その後にＥＧＲバルブ１９を通過する。ＥＧＲクーラにおいて、ＥＧＲガスの入口側の接続部１８ａから冷却水はその出口側の接続部１８ｂへとＥＧＲガスの流れに沿うように流れる。つまり、ＥＧＲクーラ１４の高温側から低温側（比較的という意味）へと冷却水は流れる。仮にその流れ方向が逆の場合、低温側から入って高温側へ流れる間に加熱され、その冷却水が高温部で沸騰するようなことが考えられる。この場合、高温側から低温側へと流れる冷却水は、高温部で急激に温度上昇するが、低温側へ向かうにしたがって温度上昇が緩やかになるため、冷却水が沸騰するのを抑える効果が得られる。
【００２９】
ＥＧＲクーラ１４およびＥＧＲバルブ１９において、これらの冷却水の流れを制御するため、配管４５に開閉バルブ４６が介装される。図示しないが、エンジンの冷却水温を検出する手段と、この検出信号に基づいて開閉バルブを制御するコントローラが設けられる。これにより、暖機運転時など冷却水温が低いときに開閉バルブ４６が閉じると、ＥＧＲクーラ１４およびＥＧＲバルブ１９への冷却水が遮断され、これらを冷却水が循環しないため、ＥＧＲガスの過度な温度低下（エンジンの燃焼状態の悪化をもたらす）を回避できる。開閉バルブ４６はいずれか１つでも良い。
【図面の簡単な説明】
【図１】この発明の実施形態を表すシステムの構成図である。
【図２】同じくＥＧＲクーラの側面を表す一部切除の正面図である。
【図３】同じくＥＧＲクーラの前面（入口側）を表す右側面図である。
【図４】同じくＥＧＲクーラの後面（出口側）を表す左側面図である。
【図５】同じくＥＧＲバルブの側面を表す一部切除の正面図である。
【符号の説明】
１０ 排気マニホールド
１３ ＥＧＲ通路
１４ ＥＧＲクーラ
１９ ＥＧＲバルブ
２０ 取付部
２１ ボス部
２２，２７ ＥＧＲ通路の配管
２３，２４ コネクタ
２５ ＥＧＲクーラの入口部
２６ ＥＧＲクーラの出口部
３０ ＥＧＲバルブのハウジング
３１ ＥＧＲバルブの通路入口
３２ ＥＧＲバルブの通路出口
３３ ＥＧＲバルブの湾曲通路
３４ バルブシート
３５ ポペット弁
３６ ＥＧＲバルブのアクチュエータ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an EGR device for an engine.
[0002]
[Prior art]
As an engine NOx countermeasure, an EGR device that recirculates a part of exhaust gas to the intake side is well known. Among these, there are some equipped with an EGR cooler for cooling the EGR gas in order to increase the density of the reflux gas (EGR gas) (Japanese Patent Laid-Open Nos. 9-137754 and 9-280118).
[0003]
For example, an EGR passage that connects an engine exhaust passage to an intake passage is provided, and an EGR valve that controls an exhaust gas recirculation rate (EGR rate) and an EGR cooler that cools EGR gas are provided in the middle of the passage. Is done.
[0004]
The EGR cooler uses a heat exchanger having a cylindrical fuselage and a plurality of cooling pipes penetrating the inside thereof in the axial direction, and cools the engine via a flow passage surrounded by the fuselage around each cooling pipe. Piped to circulate water.
[0005]
When the EGR valve is opened, a part of the exhaust of the engine is recirculated, and the EGR cooler exchanges heat with the cooling water to cool the EGR gas passing through the cooling pipe. Therefore, it is possible to substantially increase the EGR rate while securing the intake air amount to the engine.
[0006]
[Problems to be solved by the invention]
In such a conventional example, since the EGR cooler also adds weight of the cooling water, a high support rigidity is required for the mounting member (such as a bracket). In addition, when an attachment member such as a bracket is included, there is a problem that a large space is monopolized in assembling the EGR cooler. It is known that an EGR cooler is integrally attached to an engine cylinder block (JP-A-7-42628, JP-A-10-2256, etc.).
[0007]
An object of the present invention is to provide an effective countermeasure for such a problem.
[0008]
[Problems to be solved by the invention]
In a first aspect, the EGR passage for refluxing the exhaust of the engine to the intake side, the EGR device comprising an EGR valve for controlling the recirculation rate, and an EGR cooler for cooling the recirculated gas, and the outlet of the EGR cooler A mounting portion formed so as to straddle the outer periphery and a boss portion projecting on the exhaust manifold corresponding to both sides of the mounting portion are provided, and both sides of the mounting portion are respectively tightened to corresponding boss portions. In addition, with respect to the piping of the EGR passage whose one end is connected to the inlet portion of the EGR cooler, the other end is connected to the joint portion with the EGR passage formed in the exhaust manifold via a substantially horizontal joint surface, thereby the EGR cooler. Is assembled horizontally on the exhaust manifold along the longitudinal direction of the engine .
[0009]
The second invention is characterized in that, in the first invention, the EGR valve is integrally assembled with the EGR cooler .
[0011]
【The invention's effect】
In the first invention, since the exhaust manifold coupled to the engine via the branch pipe is used as an EGR cooler mounting member (such as a bracket), high support rigidity that can withstand the weight of the EGR cooler is obtained, and a dedicated mounting is provided. Since no member (such as a bracket) is required, it is advantageous in terms of space and cost. Further, since the EGR cooler is compactly assembled on the exhaust manifold along the front-rear direction of the engine, the space around the engine can be used effectively .
[0012]
Further , the EGR cooler is supported in a well-balanced manner at three points, that is, each boss portion on the exhaust manifold and a joint portion with the EGR passage.
[0013]
In the third invention, the EGR valve is also supported by the exhaust manifold via the EGR cooler. For this reason, it is not necessary to support the EGR valve alone, and the assembling property is improved.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, reference numeral 10 denotes an exhaust manifold of the engine, which is formed of a branch pipe 11 corresponding to each cylinder and a collection portion 12 thereof. Each branch pipe 11 is formed with a mounting portion 11a with a cylinder head, and the collecting portion 12 is formed with a joint portion 12a with an exhaust pipe (not shown). Reference numeral 13 denotes an EGR passage that recirculates the exhaust of the engine to the intake side, and a joint portion 13 a to the EGR passage 13 is formed at one end of the exhaust manifold 10. An EGR cooler 14 that cools EGR gas (reflux gas) and an EGR valve 19 that controls the EGR rate (reflux rate) are interposed in the middle of the EGR passage 13.
[0015]
The EGR cooler 14 includes a cylindrical body 15 and a plurality of cooling pipes 16 penetrating the inside in the axial direction as shown in FIGS. 2 to 4, and a flow path 17 surrounded by the body 15 is formed around the EGR cooler 14. Heat exchange is performed between the EGR gas passing through the cooling pipe 16 and the cooling water passing through the flow path 17 around the EGR gas. 18a and 18b are connecting portions for cooling pipes, which are arranged on the inlet side and the outlet side of the EGR gas. Although not shown in the drawings, the eye connectors are tightened with eye bolts, and the engine coolant is circulated through the eye connectors via a flow path 17 surrounded by the body 15.
[0016]
A pedestal mounting portion 20 is formed on the outer periphery of the EGR cooler 14 so as to straddle the EGR cooler 14 in the orthogonal direction, and through holes 20a for fastening bolts are provided on both sides thereof. Boss portions 21 corresponding to the through holes 20 a of the mounting portion 20 are projected on the exhaust manifold 10, and screw holes (not shown) for fastening bolts are formed in these boss portions 21. Then, the mounting portion 20 is overlapped on the boss portion 21 and a tightening bolt (not shown) is screwed into the screw hole through the through hole 20a. Attached to a table.
[0017]
In FIG. 1, reference numeral 22 denotes a pipe of the EGR passage 13, and one end thereof is connected to the joint portion 13 a of the exhaust manifold 10. The EGR cooler 14 includes connectors 23 and 24 at the front and rear. The front connector 23 is fitted to the outer periphery of the body 15 via a large-diameter opening 22a, and by narrowing the cylindrical shape to the opposite side, a small-diameter opening 22b corresponding to the diameter of the pipe 22 is formed. A small-diameter opening 22 b is connected to the other end of the pipe 22, and the connector 22 forms an inlet 25 for diffusing the EGR gas from the pipe 22 into each branch pipe 16 inside thereof. The joint part 13 a with the pipe 22 is formed on an upward substantially horizontal joint surface that supports the front part of the EGR cooler 14 via the pipe 22 so as to constitute a support part of the EGR cooler 14 together with the boss part 21.
[0018]
The rear connector 24 is formed in a straight cylindrical shape having both ends opened to substantially the same diameter, and is fitted to the outer periphery of the body 15 through one opening 24a. The EGR valve 19 is integrally assembled in the other opening 24b, and the connector 24 forms an outlet 26 that guides EGR gas straight from each branch pipe to the EGR valve 19 inside thereof. Note that the mounting portion 20 of the EGR cooler 14 is integrally formed on the outer periphery of the connector 24. Reference numeral 27 denotes a pipe of the EGR passage 13 having one end connected to an intake passage (not shown) of the engine, and the other end is connected to a passage outlet 32 of the EGR valve 19.
[0019]
As shown in FIG. 5, the EGR valve 19 has a passage inlet 31 formed on one side surface of the housing 30 and a passage outlet 32 opened on a side surface orthogonal thereto, and a curved passage 33 connecting them is formed. The outlet portion 26 of the EGR cooler 19 is connected to the joint surface of the passage inlet 31, and the pipe 27 of the EGR passage 13 is connected to the joint surface of the passage outlet 32. A valve seat 34 is formed immediately before the curved passage 30 (passage outlet side), and a poppet valve 35 having a valve head 35a corresponding to the seat surface is provided. The poppet valve 35 is slidably supported by the housing 30 in the opening / closing direction of the valve seat 34 via the valve stem 35b.
[0020]
Reference numeral 36 denotes an actuator for opening and closing the poppet valve 35, and an air cylinder structure is adopted. Two connecting portions 36a and 36b for air piping are opened in the cylinder, and a valve for controlling the stroke (opening and closing) of the poppet valve 35 is provided in a piping (not shown) connecting each of them with an air pressure generating source. In the EGR valve 19, the passage inlet 31 on the EGR cooler 14 side has a larger inner diameter than the passage outlet 32 on the piping 27 side, and a stepped portion 37 is formed in the middle of the passage. The valve seat 34 uses this as a locking surface. Can be assembled using.
[0021]
In order to reduce the thermal load of the EGR valve 19, a jacket (not shown) is formed inside the housing 30 so as to wrap the curved passage 33 and the valve stem 35 b of the poppet valve 35. Reference numerals 40 a and 40 b denote piping connection parts, and two are arranged on the side surface of the housing 30. Although not shown in each of the connecting portions 40a and 40b, eye connectors are fastened with eye bolts, and piping is performed so that engine cooling water circulates through these jackets.
[0022]
With such a configuration, when EGR is performed, EGR gas is supplied to the intake side via the EGR cooler 14 and the EGR valve 19. In the EGR cooler 14, the EGR gas that passes through the inside of each cooling pipe 16 is cooled by heat exchange with the cooling water that flows inside the body 15, and is sent out to the EGR valve 19. In this case, since the EGR gas cooled by the EGR cooler 14 passes through the EGR valve 19, the thermal load on the EGR valve can be reduced. In addition, since the EGR valve after cooling is controlled, the EGR valve can control the EGR rate stably and accurately without being greatly influenced by the exhaust temperature of the engine.
[0023]
The EGR valve 19 also has high reliability and durability because the heat load is reduced by the cooling water passing through the jacket of the housing 30. In this case, by assembling the EGR valve 19 integrally with the EGR cooler 14, it is not necessary to connect the EGR cooler 14 and the EGR valve 19 by piping, and therefore the piping work of the EGR passage 13 is simplified. Moreover, since these support means (attachment part 20 and boss | hub part 21 etc.) can also be shared, the improvement of an assembly | attachment property is obtained.
[0024]
Since the EGR cooler 14 is also provided with a cooling water flow path 17 inside the fuselage 15, the diameter is larger than the pipes 22 and 27 of the EGR path 13. A connector is attached. In this embodiment, the outlet part 26 of the EGR cooler 14 and the passage inlet 31 of the EGR valve 19 have the same diameter (dimension d in FIG. 5), and the rear connector 24 does not have a restriction. can get.
[0025]
In the internal passage 33 of the EGR valve 19, the diameter of the EGR cooler 19 side and the piping 27 side can be easily adjusted by the stepped portion 37. Since the stepped portion 37 is used as a locking surface of the valve seat 34, the processing is not wasteful, and it is advantageous in terms of cost compared to a connector with a throttle.
[0026]
The EGR cooler 14 and the EGR valve 19 do not depend on brackets or the like, but are mounted on the exhaust manifold 10 and use the strength thereof to obtain a high support rigidity that can withstand these weights (including the weight of the cooling water). Further, it is supported in a well-balanced manner at the three points of the joint portion between the two boss portions 21 and the pipe 22. Since the EGR cooler 14 and the EGR valve 19 are compactly assembled on the exhaust manifold 10 so as to follow them, the space around the engine can be effectively used.
[0027]
Regarding the cooling water piping, an EGR cooler 14 and an EGR valve 19 are interposed in series with respect to a cooling water passage (not shown) of the engine. The connection portion 18a on the inlet side of the EGR cooler 14 is connected to the high pressure side of the engine cooling water channel, the connection portion 18b on the outlet side of the EGR cooler 14 is connected to one connection portion 40a of the EGR valve 19, and the other connection portion of the EGR valve 19 is connected. The low pressure side of the engine cooling water is respectively piped to 40b (see FIG. 1).
[0028]
The engine coolant passes through the EGR cooler 14 and then passes through the EGR valve 19. In the EGR cooler, the cooling water flows from the connection portion 18a on the EGR gas inlet side to the connection portion 18b on the outlet side so as to follow the flow of the EGR gas. That is, the cooling water flows from the high temperature side of the EGR cooler 14 to the low temperature side (relatively). If the flow direction is reversed, it may be heated while flowing from the low temperature side to the high temperature side, and the cooling water may boil at the high temperature portion. In this case, the cooling water flowing from the high temperature side to the low temperature side suddenly rises in temperature at the high temperature part, but since the temperature rises gradually toward the low temperature side, the effect of suppressing the boiling of the cooling water is obtained. It is done.
[0029]
In the EGR cooler 14 and the EGR valve 19, an opening / closing valve 46 is interposed in the pipe 45 in order to control the flow of the cooling water. Although not shown, a means for detecting the cooling water temperature of the engine and a controller for controlling the open / close valve based on this detection signal are provided. As a result, when the opening / closing valve 46 is closed when the cooling water temperature is low, such as during warm-up operation, the cooling water to the EGR cooler 14 and the EGR valve 19 is shut off, and the cooling water does not circulate therethrough, so that excessive EGR gas It is possible to avoid a temperature drop (which causes deterioration of the combustion state of the engine). Any one of the opening / closing valves 46 may be used.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a system representing an embodiment of the present invention.
FIG. 2 is a partially cut away front view showing the side surface of the EGR cooler.
FIG. 3 is a right side view showing the front surface (inlet side) of the EGR cooler.
FIG. 4 is a left side view showing the rear surface (exit side) of the EGR cooler.
FIG. 5 is a partially cut away front view showing the side surface of the EGR valve.
[Explanation of symbols]
10 Exhaust manifold 13 EGR passage 14 EGR cooler 19 EGR valve 20 Mounting portion 21 Boss portion 22, 27 EGR passage piping 23, 24 Connector 25 EGR cooler inlet portion 26 EGR cooler outlet portion 30 EGR valve housing 31 EGR valve housing Passage inlet 32 passage outlet 33 of EGR valve curved passage 34 of EGR valve valve seat 35 poppet valve 36 actuator of EGR valve

Claims (2)

エンジンの排気を吸気側に環流するＥＧＲ通路と、その環流率を制御するＥＧＲバルブと、環流ガスを冷却するＥＧＲクーラと、を備えるＥＧＲ装置において、ＥＧＲクーラの出口部にその外周を跨ぐように形成される取付部と、取付部の両側に対応して排気マニホールド上に突設されるボス部と、を備えてなり、取付部の両側をそれぞれ対応するボス部に締め付けると共に、ＥＧＲクーラの入口部に一端が連結されるＥＧＲ通路の配管について、その他端を排気マニホールドに形成されるＥＧＲ通路との接合部に略水平な接合面を介して連結することにより、ＥＧＲクーラを排気マニホールド上でエンジンの前後方向へ沿う横置状態に組み付けたことを特徴とするＥＧＲ装置。In an EGR device comprising an EGR passage for circulating the exhaust of the engine to the intake side, an EGR valve for controlling the recirculation rate, and an EGR cooler for cooling the recirculation gas, the EGR cooler has an outlet portion straddling its outer periphery. A mounting portion to be formed, and a boss portion projecting on the exhaust manifold corresponding to both sides of the mounting portion, and tightening both sides of the mounting portion to the corresponding boss portion, and an inlet of the EGR cooler As for the piping of the EGR passage whose one end is connected to the portion, the other end is connected to the joint portion with the EGR passage formed on the exhaust manifold through a substantially horizontal joint surface, whereby the EGR cooler is connected to the engine on the exhaust manifold. An EGR device assembled in a lateral state along the front-rear direction . ＥＧＲクーラにＥＧＲバルブを一体的に組み付けたことを特徴とする請求項１に記載のＥＧＲ装置。The EGR device according to claim 1, wherein an EGR valve is integrally assembled with the EGR cooler.
JP17456098A 1998-06-22 1998-06-22 EGR device Expired - Fee Related JP3775926B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17456098A JP3775926B2 (en) 1998-06-22 1998-06-22 EGR device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17456098A JP3775926B2 (en) 1998-06-22 1998-06-22 EGR device

Publications (2)

Publication Number Publication Date
JP2000008973A JP2000008973A (en) 2000-01-11
JP3775926B2 true JP3775926B2 (en) 2006-05-17

Family

ID=15980701

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17456098A Expired - Fee Related JP3775926B2 (en) 1998-06-22 1998-06-22 EGR device

Country Status (1)

Country Link
JP (1) JP3775926B2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3657524B2 (en) * 2001-03-27 2005-06-08 日野自動車株式会社 EGR cooler mounting device
FR2875540B1 (en) * 2004-09-20 2007-03-16 Mark Iv Systemes Moteurs Sa MULTIFUNCTIONAL MODULE, MOTOR VEHICLE COMPRISING SUCH A MODULE AND METHOD OF MANUFACTURING SUCH A MODULE
JP4551852B2 (en) 2005-09-28 2010-09-29 株式会社クボタ Multi-cylinder engine
JP4484799B2 (en) 2005-09-28 2010-06-16 株式会社クボタ Multi-cylinder engine
US9611818B2 (en) 2014-12-03 2017-04-04 Hyundai Motor Company Integrated EGR valve housing
CN111648883B (en) * 2020-07-03 2024-06-25 安徽华菱汽车有限公司 Shock-absorbing and noise-reducing device for air inlet pipeline system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59517U (en) * 1982-06-25 1984-01-05 ダイハツ工業株式会社 Arrangement structure of ventilation pipe for blow-by gas
JPS60156931A (en) * 1984-01-25 1985-08-17 Yanmar Diesel Engine Co Ltd Intercooler setup structure for supercharged, multicylinder engine
JPH01131857U (en) * 1988-03-02 1989-09-07
JP3544269B2 (en) * 1996-06-18 2004-07-21 日野自動車株式会社 EGR device for engine

Also Published As

Publication number Publication date
JP2000008973A (en) 2000-01-11

Similar Documents

Publication Publication Date Title
JP3669275B2 (en) EGR gas cooling device for internal combustion engine
US5690082A (en) Structure for supporting EGR valve in engine
JP5719376B2 (en) EGR cooler structure
US8939115B2 (en) Cylinder head cooling system
JP3775572B2 (en) Water-cooled internal combustion engine
JP6174348B2 (en) Internal combustion engine for vehicles
US6830016B2 (en) System and method for cooling an engine
JP3775926B2 (en) EGR device
JP4054441B2 (en) EGR device
JP2012047154A (en) Internal combustion engine
JP2005320980A (en) Cooling mechanism for recirculated gas
JP2001221106A (en) Circulated gas cooling system
JP3178177B2 (en) Cooling system for supercharged engine
JP7400693B2 (en) Engine exhaust circulation system
JP2582966B2 (en) Exhaust gas recirculation system for internal combustion engine
JP5482581B2 (en) Cooling device for internal combustion engine
JP3132216B2 (en) Engine cooling system
JP4067798B2 (en) EGR piping structure
JP3556378B2 (en) Intercooler
JP2010164021A (en) Exhaust cooling system
JP2000008969A (en) Egr device
JP2011252454A (en) Cooling device for internal combustion engine
JP2955793B2 (en) Engine cooling structure
JP2004027901A (en) Internal combustion engine with plural air coolers
JP6344405B2 (en) Engine intake cooling system

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20050217

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20050222

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20050425

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20050913

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20051114

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20051220

A911 Transfer of reconsideration by examiner before appeal (zenchi)

Free format text: JAPANESE INTERMEDIATE CODE: A911

Effective date: 20051227

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20060214

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20060221

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090303

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120303

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120303

Year of fee payment: 6

S533 Written request for registration of change of name

Free format text: JAPANESE INTERMEDIATE CODE: R313533

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120303

Year of fee payment: 6

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

LAPS Cancellation because of no payment of annual fees