JP4054478B2 - EGR valve cooling structure - Google Patents

EGR valve cooling structure Download PDF

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Publication number
JP4054478B2
JP4054478B2 JP09301299A JP9301299A JP4054478B2 JP 4054478 B2 JP4054478 B2 JP 4054478B2 JP 09301299 A JP09301299 A JP 09301299A JP 9301299 A JP9301299 A JP 9301299A JP 4054478 B2 JP4054478 B2 JP 4054478B2
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Japan
Prior art keywords
passage
valve
cooling
egr
actuator
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Expired - Fee Related
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JP09301299A
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JP2000282964A (en
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幸夫 紺野
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UD Trucks Corp
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UD Trucks Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Description

【０００１】
【発明の属する技術分野】
本発明は、エンジンに備えられるＥＧＲバルブの冷却構造に関するものである。
【０００２】
【従来の技術】
排気通路からＥＧＲガスを吸気通路に還流するエンジンは、運転条件に応じて排気通路から吸気通路に還流されるＥＧＲガス量を調節するＥＧＲバルブを備えている(実開平６−１７４８９号公報、参照)。
【０００３】
大量のＥＧＲガスが通過するＥＧＲバルブにあっては、そのハウジングにエンジン冷却水を循環させて冷却する必要がある。例えば実開平７−４１００８号公報に開示されてものは、ハウジングのＥＧＲバルブまわりにエンジン冷却水を循環させるようになっている。
【０００４】
【発明が解決しようとする課題】
しかしながら、流体圧アクチュエータを介してＥＧＲバルブを開閉駆動するものにあっては、ハウジングのＥＧＲバルブまわりを冷却しても、ＥＧＲバルブからの伝熱により流体圧アクチュエータが高温になり、流体圧アクチュエータに介装されるシール等が過熱される可能性がある。
【０００５】
本発明は上記の問題点を鑑みてなされたものであり、流体圧アクチュエータを備えるＥＧＲバルブの冷却構造を提供することを目的とする。
【０００６】
【課題を解決するための手段】
第１の発明は、ＥＧＲ通路を画成するハウジングと、前記ＥＧＲ通路を開閉する傘弁状をしたＥＧＲバルブと、前記ハウジングに前記ＥＧＲバルブのステム部を摺動可能に支持するバルブガイドと、前記ＥＧＲバルブのステム部に係合して前記ＥＧＲバルブを開弁させる流体圧アクチュエータとしての空気圧シリンダと、前記ハウジングに冷却液としてエンジン冷却水を循環させる冷却通路と、を備えるＥＧＲバルブの冷却構造に適用する。
【０００７】
そして、前記ハウジングは、前記冷却通路として、前記バルブガイドのまわりを環状に形成されるバルブガイド冷却通路部と、前記空気圧シリンダのまわりを環状に形成されるアクチュエータ冷却通路部と、前記バルブガイド冷却通路部をエンジン冷却水のウォータポンプの出口側に連通させる入り口通路と、前記アクチュエータ冷却通路部をエンジン冷却水のラジエータの入口側に連通させる出口通路と、前記バルブガイド冷却通路部と前記アクチュエータ冷却通路部との間を連通させる連絡通路と、を備えるものとした。
【０００９】
【発明の作用および効果】
第１の発明において、ＥＧＲバルブとバルブガイドおよびハウジングはＥＧＲガスにさらされるが、バルブガイド冷却通路部を通ってバルブガイドのまわりを循環するエンジン冷却水がＥＧＲガスから受ける熱を吸収し、バルブガイドを構成するブッシュやハウジングが過熱されることを防止する。
【００１０】
さらにＥＧＲバルブの熱が空気圧シリンダに伝わるが、アクチュエータ冷却通路部を通って空気圧シリンダのまわりを循環するエンジン冷却水が空気圧シリンダの熱を吸収する。これにより、空気圧シリンダを構成するシール材等が過熱されることを防止する。
【００１１】
ウォータポンプの出口側からラジエータの入口側へのエンジン冷却水は、ハウジングにおいて、入り口通路→バルブガイド冷却通路部→連絡通路→アクチュエータ冷却通路部→出口通路、の順に流れる。この場合、バルブガイド冷却通路部が、アクチュエータ冷却通路部の上流側に配置されることにより、バルブガイド冷却通路部を循環する冷却水温度は、アクチュエータ冷却通路部を循環する冷却水温度より低くなり、ＥＧＲガスにさらされるバルブガイドの冷却性を十分に確保できる。
【００１２】
【発明の実施の形態】
以下、本発明の実施の形態を添付図面に基づいて説明する。
【００１３】
図１に示すように、ハウジング２にはＥＧＲ通路４が画成され、ＥＧＲ通路４を開閉するＥＧＲバルブ１が収装される。ＥＧＲバルブ１が開弁すると、図示しないエンジンの排気通路から不活性なＥＧＲガスがＥＧＲ通路１を通って吸気通路に還流する。これにより、シリンダ内の酸素濃度を下げ、燃料の燃焼温度を下げてＮＯxの発生を抑えるようになっている。
【００１４】
傘弁状をしたＥＧＲバルブ１は、その傘部１２がハウジング２のシート部２９に着座することによりＥＧＲ通路４を閉じ、傘部１２がシート部２９から離れるリフト量に応じてＥＧＲ量を増減する。
【００１５】
ＥＧＲバルブ１のステム部１１を摺動可能に支持するバルブガイド５として、ハウジング２にブッシュ８が圧入される。
【００１６】
ＥＧＲバルブ１のステム部１１にはリテーナ３１が結合され、リテーナ３１とハウジング２の間にスプリング３が圧縮して介装される。ＥＧＲバルブ１はスプリング３によって閉弁方向に付勢される。
【００１７】
スプリング３に抗してＥＧＲバルブ１を開弁駆動する流体圧アクチュエータとして空気圧シリンダ６が設けられる。空気圧シリンダ６はハウジング２に摺動可能に嵌合するシリンダ３２と、シリンダ３２の内側に摺動可能に嵌合するピストン３３とを備え、両者がＥＧＲバルブ１のステム頂部に係合している。ハウジング２にはピストン３３およびシリンダ３２の間に図示しない圧力室が画成されており、エンジン運転条件に応じて圧力室に導かれる空気圧が所定値を超えて上昇すると、まずピストン３３のみがスプリング３を圧縮しながら下降してＥＧＲバルブ１を所定量だけリフトさせ、空気圧がさらに上昇するとシリンダ３２がスプリング１０を圧縮しながらピストン３３と一緒に下降してＥＧＲバルブ１をさらにリフトさせる。これによりＥＧＲ量が二段階に調節される。
【００１８】
ハウジング２とシリンダ３２の間にはガイド部３４とシール３５がそれぞれ介装される。ガイド部５はハウジング２の内周面に摺接して、ハウジング２に対してシリンダ３２を摺動可能に案内する。シール３５はハウジング２の内周面に摺接して圧力室を密封する。
【００１９】
ハウジング２に冷却液としてエンジン冷却水を循環させる冷却通路７が形成される。冷却通路７は、バルブガイド５のまわりに冷却液を循環させるバルブガイド冷却通路部２１と、空気圧シリンダ６のまわりに冷却液を循環させるアクチュエータ冷却通路部２２とを備える。
【００２０】
バルブガイド冷却通路部２１はブッシュ８のまわりに環状に延び、これを循環する冷却水がブッシュ８の熱を吸収する。
【００２１】
アクチュエータ冷却通路部２２は空気圧シリンダ６のまわりに環状に延び、これを循環する冷却水が空気圧シリンダ６の熱を吸収する。
【００２２】
バルブガイド冷却通路部２１はアクチュエータ冷却通路部２２の上流側に配置される。バルブガイド冷却通路部２１とアクチュエータ冷却通路部２２は連絡通路２４を介して連通し、バルブガイド冷却通路部２１は入り口通路２３を介して図示しないウォータポンプの吐出側に連通する一方、アクチュエータ冷却通路部２２は出口通路２５を介して図示しないラジエータに連通している。
【００２３】
以上のように構成されて、ウォータポンプから圧送される冷却水は、図中矢印で示すようにハウジング２に開口した入り口通路２３を通ってバルブガイド冷却通路部２１に流入し、バルブガイド冷却通路部２１から連絡通路２４を通ってアクチュエータ冷却通路部２２を循環し、アクチュエータ冷却通路部２２から出口通路２５を通って図示しないラジエータに送られ、ラジエータを循環した後にウォータポンプに吸い込まれる。
【００２４】
ＥＧＲバルブ１とブッシュ８およびハウジング２はＥＧＲガスにさらされるが、バルブガイド冷却通路部２１を通ってバルブガイド５のまわりを循環する冷却水がバルブガイド５の熱を吸収し、ブッシュ８やハウジング２が過熱されることを防止する。
【００２５】
さらにＥＧＲバルブ１の熱が空気圧シリンダ６に伝わるが、アクチュエータ冷却通路部２２を通って空気圧シリンダ６のまわりを循環する冷却水が空気圧シリンダ６の熱を吸収し、ガイド部３４やシール３５が過熱されることを防止する。
【００２６】
バルブガイド冷却通路部２１がアクチュエータ冷却通路部２２の上流側に配置されることにより、バルブガイド冷却通路部２１の冷却水温度はアクチュエータ冷却通路部２２の冷却水温度より低くなり、ＥＧＲガスにさらされるブッシュ８等の冷却性が十分に確保される。
【図面の簡単な説明】
【図１】本発明の実施の形態を示すＥＧＲバルブの断面図。
【符号の説明】
１ ＥＧＲバルブ
２ ハウジング
３ スプリング
４ ＥＧＲ通路
５ バルブガイド
６ 空気圧シリンダ（流体圧アクチュエータ）
７ 冷却通路
８ ブッシュ
２１ バルブガイド冷却通路部
２２ アクチュエータ冷却通路部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling structure for an EGR valve provided in an engine.
[0002]
[Prior art]
An engine that recirculates EGR gas from the exhaust passage to the intake passage includes an EGR valve that adjusts the amount of EGR gas that is recirculated from the exhaust passage to the intake passage according to operating conditions (see Japanese Utility Model Laid-Open No. 6-17489). ).
[0003]
In an EGR valve through which a large amount of EGR gas passes, it is necessary to circulate engine cooling water through the housing for cooling. For example, what is disclosed in Japanese Utility Model Laid-Open No. 7-41008 is designed to circulate engine cooling water around the EGR valve of the housing.
[0004]
[Problems to be solved by the invention]
However, in the case where the EGR valve is opened and closed via the fluid pressure actuator, even if the area around the EGR valve of the housing is cooled, the fluid pressure actuator becomes high temperature due to heat transfer from the EGR valve, and the fluid pressure actuator There is a possibility that an interposed seal or the like may be overheated.
[0005]
The present invention has been made in view of the above problems, and an object thereof is to provide a cooling structure for an EGR valve including a fluid pressure actuator.
[0006]
[Means for Solving the Problems]
A first invention includes a housing that defines an EGR passage, an umbrella-shaped EGR valve that opens and closes the EGR passage, a valve guide that slidably supports a stem portion of the EGR valve on the housing, A cooling structure for an EGR valve , comprising: a pneumatic cylinder as a fluid pressure actuator that engages with a stem portion of the EGR valve to open the EGR valve; and a cooling passage that circulates engine coolant as a coolant in the housing. Applies to
[0007]
The housing includes, as the cooling passage, a valve guide cooling passage portion formed in an annular shape around the valve guide, an actuator cooling passage portion formed in an annular shape around the pneumatic cylinder, and the valve guide cooling. An inlet passage that connects the passage portion to the outlet side of the engine coolant water pump, an outlet passage that connects the actuator cooling passage portion to the inlet side of the engine coolant, the valve guide cooling passage portion, and the actuator cooling And a communication passage that communicates with the passage portion .
[0009]
Operation and effect of the invention
In the first invention, the EGR valve, the valve guide, and the housing are exposed to EGR gas, but the engine coolant that circulates around the valve guide through the valve guide cooling passage absorbs heat received from the EGR gas, and the valve This prevents the bush and the housing constituting the guide from being overheated.
[0010]
Further, the heat of the EGR valve is transmitted to the pneumatic cylinder , but the engine coolant that circulates around the pneumatic cylinder through the actuator cooling passage absorbs the heat of the pneumatic cylinder . Thereby, it is prevented that the sealing material etc. which comprise a pneumatic cylinder are overheated.
[0011]
Engine cooling water from the outlet side of the water pump to the inlet side of the radiator flows in the housing in the order of the inlet passage → the valve guide cooling passage portion → the communication passage → the actuator cooling passage portion → the outlet passage. In this case, the valve guide cooling passage section, by being disposed on the upstream side of the actuator cooling passage, the cooling water temperature which circulates the valve guide cooling passage is lower than the cooling water temperature which circulates the actuator cooling passage The cooling performance of the valve guide exposed to the EGR gas can be sufficiently secured.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0013]
As shown in FIG. 1, an EGR passage 4 is defined in the housing 2, and an EGR valve 1 that opens and closes the EGR passage 4 is accommodated. When the EGR valve 1 is opened, an inert EGR gas returns from the exhaust passage of the engine (not shown) to the intake passage through the EGR passage 1. As a result, the oxygen concentration in the cylinder is lowered, the combustion temperature of the fuel is lowered, and the generation of NOx is suppressed.
[0014]
The EGR valve 1 in the shape of an umbrella valve closes the EGR passage 4 when the umbrella portion 12 is seated on the seat portion 29 of the housing 2, and increases or decreases the EGR amount according to the lift amount that the umbrella portion 12 moves away from the seat portion 29. To do.
[0015]
A bush 8 is press-fitted into the housing 2 as a valve guide 5 that slidably supports the stem portion 11 of the EGR valve 1.
[0016]
A retainer 31 is coupled to the stem portion 11 of the EGR valve 1, and a spring 3 is compressed and interposed between the retainer 31 and the housing 2. The EGR valve 1 is urged in the valve closing direction by a spring 3.
[0017]
A pneumatic cylinder 6 is provided as a fluid pressure actuator that opens the EGR valve 1 against the spring 3. The pneumatic cylinder 6 includes a cylinder 32 that is slidably fitted to the housing 2 and a piston 33 that is slidably fitted to the inside of the cylinder 32, and both are engaged with the stem top of the EGR valve 1. . In the housing 2, a pressure chamber (not shown) is defined between the piston 33 and the cylinder 32, and when the air pressure guided to the pressure chamber rises above a predetermined value according to engine operating conditions, only the piston 33 is first spring-loaded. 3 is lowered while compressing 3 to lift the EGR valve 1 by a predetermined amount, and when the air pressure is further increased, the cylinder 32 is lowered together with the piston 33 while compressing the spring 10 to further lift the EGR valve 1. As a result, the EGR amount is adjusted in two stages.
[0018]
A guide portion 34 and a seal 35 are interposed between the housing 2 and the cylinder 32, respectively. The guide portion 5 is in sliding contact with the inner peripheral surface of the housing 2 and guides the cylinder 32 to be slidable relative to the housing 2. The seal 35 is in sliding contact with the inner peripheral surface of the housing 2 to seal the pressure chamber.
[0019]
A cooling passage 7 is formed in the housing 2 for circulating engine coolant as a coolant. The cooling passage 7 includes a valve guide cooling passage portion 21 that circulates the coolant around the valve guide 5 and an actuator cooling passage portion 22 that circulates the coolant around the pneumatic cylinder 6.
[0020]
The valve guide cooling passage portion 21 extends in an annular shape around the bush 8, and the cooling water circulating through this absorbs the heat of the bush 8.
[0021]
The actuator cooling passage portion 22 extends annularly around the pneumatic cylinder 6, and cooling water circulating through the actuator cooling passage portion 22 absorbs heat of the pneumatic cylinder 6.
[0022]
The valve guide cooling passage portion 21 is disposed on the upstream side of the actuator cooling passage portion 22. The valve guide cooling passage portion 21 and the actuator cooling passage portion 22 communicate with each other via a communication passage 24, and the valve guide cooling passage portion 21 communicates with a discharge side of a water pump (not shown) via an inlet passage 23, while the actuator cooling passage The portion 22 communicates with a radiator (not shown) via the outlet passage 25.
[0023]
The cooling water configured as described above and pumped from the water pump flows into the valve guide cooling passage portion 21 through the inlet passage 23 opened in the housing 2 as indicated by an arrow in the drawing, and is supplied to the valve guide cooling passage. The actuator 21 is circulated in the actuator cooling passage 22 through the communication passage 24, sent from the actuator cooling passage 22 through the outlet passage 25 to the radiator (not shown), and circulated through the radiator to be sucked into the water pump.
[0024]
The EGR valve 1, the bush 8 and the housing 2 are exposed to EGR gas, but the cooling water circulating around the valve guide 5 through the valve guide cooling passage 21 absorbs the heat of the valve guide 5, and the bush 8 and the housing 2 is prevented from overheating.
[0025]
Further, the heat of the EGR valve 1 is transmitted to the pneumatic cylinder 6, but the cooling water circulating around the pneumatic cylinder 6 through the actuator cooling passage portion 22 absorbs the heat of the pneumatic cylinder 6 and the guide portion 34 and the seal 35 are overheated. To prevent it.
[0026]
By disposing the valve guide cooling passage portion 21 on the upstream side of the actuator cooling passage portion 22, the cooling water temperature of the valve guide cooling passage portion 21 becomes lower than the cooling water temperature of the actuator cooling passage portion 22 and is exposed to EGR gas. The cooling ability of the bush 8 or the like is sufficiently secured.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an EGR valve showing an embodiment of the present invention.
[Explanation of symbols]
1 EGR valve 2 Housing 3 Spring 4 EGR passage 5 Valve guide 6 Pneumatic cylinder (fluid pressure actuator)
7 Cooling passage 8 Bush 21 Valve guide cooling passage 22 Actuator cooling passage

Claims (1)

ＥＧＲ通路を画成するハウジングと、前記ＥＧＲ通路を開閉する傘弁状をしたＥＧＲバルブと、前記ハウジングに前記ＥＧＲバルブのステム部を摺動可能に支持するバルブガイドと、前記ＥＧＲバルブのステム部に係合して前記ＥＧＲバルブを開弁させる流体圧アクチュエータとしての空気圧シリンダと、前記ハウジングに冷却液としてエンジン冷却水を循環させる冷却通路と、を備えるＥＧＲバルブの冷却構造において、前記ハウジングは、前記冷却通路として、前記バルブガイドのまわりを環状に形成されるバルブガイド冷却通路部と、前記空気圧シリンダのまわりを環状に形成されるアクチュエータ冷却通路部と、前記バルブガイド冷却通路部をエンジン冷却水のウォータポンプの出口側に連通させる入り口通路と、前記アクチュエータ冷却通路部をエンジン冷却水のラジエータの入口側に連通させる出口通路と、前記バルブガイド冷却通路部と前記アクチュエータ冷却通路部との間を連通させる連絡通路と、を備えたことを特徴とするＥＧＲバルブ冷却構造。A housing that defines an EGR passage, an umbrella-shaped EGR valve that opens and closes the EGR passage, a valve guide that slidably supports the stem portion of the EGR valve on the housing, and a stem portion of the EGR valve The EGR valve cooling structure includes: a pneumatic cylinder as a fluid pressure actuator that engages with the valve and opens the EGR valve; and a cooling passage that circulates engine cooling water as a coolant in the housing. As the cooling passage, a valve guide cooling passage portion formed in an annular shape around the valve guide, an actuator cooling passage portion formed in an annular shape around the pneumatic cylinder, and the valve guide cooling passage portion as engine cooling water. An inlet passage communicating with the outlet side of the water pump, and the actuator EGR to the outlet passage communicating the cooling passage on the inlet side of the engine cooling water of the radiator, characterized in that and a communication passage for communicating between said valve guide cooling passages said actuator cooling passage Valve cooling structure.
JP09301299A 1999-03-31 1999-03-31 EGR valve cooling structure Expired - Fee Related JP4054478B2 (en)

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Publication number Priority date Publication date Assignee Title
DE60218053T3 (en) 2002-12-06 2011-03-24 Renault S.A.S. Exhaust gas recirculation
JP2005220747A (en) 2004-02-03 2005-08-18 Usui Kokusai Sangyo Kaisha Ltd Egr gas cooling mechanism
JP5095458B2 (en) 2008-03-21 2012-12-12 株式会社小松製作所 Hydraulic servo drive device and variable turbocharger using the same
JP2009299767A (en) * 2008-06-12 2009-12-24 Komatsu Ltd Hydraulic servo driving device
JP5074317B2 (en) * 2008-07-16 2012-11-14 愛三工業株式会社 Flow path switching valve
JP2010203362A (en) * 2009-03-04 2010-09-16 Aisan Ind Co Ltd Exhaust gas switching valve
DE102010045259A1 (en) * 2010-09-14 2012-03-15 Pierburg Gmbh cooling arrangement
KR102614630B1 (en) * 2015-03-02 2023-12-18 아벤틱스 코포레이션 Valve assembly and cooling method
FR3041693B1 (en) * 2015-09-30 2019-08-30 Valeo Systemes De Controle Moteur MOTOR VEHICLE EQUIPMENT CONNECTED TO AN INTERNAL COMBUSTION ENGINE

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