JP2005207360A - Egr valve - Google Patents

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JP2005207360A
JP2005207360A JP2004016765A JP2004016765A JP2005207360A JP 2005207360 A JP2005207360 A JP 2005207360A JP 2004016765 A JP2004016765 A JP 2004016765A JP 2004016765 A JP2004016765 A JP 2004016765A JP 2005207360 A JP2005207360 A JP 2005207360A
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valve
housing
valve stem
exhaust gas
actuator
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Japanese (ja)
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Koichi Suzuki
浩一 鈴木
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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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that exhaust gas leaking to a valve stem storage chamber side of a housing intrudes in an actuator side. <P>SOLUTION: In an EGR valve provided with a housing 1 provided with a gas flow passage for being put in a middle of an exhaust gas recirculation line of an engine, a valve main body including a valve element having a opening and closing port at an appropriate position of the gas flow passage in the housing 1 and opening and closing the same and having a valve stem 4b as one body with the valve element penetrating through the housing 1 and arranged in a valve stem storage chamber 5 formed in the housing 1, and an actuator 9 acting on the valve stem 4b of the valve main body 4 and performing opening and closing operation of the opening and closing port by the valve element, an exhaust gas flow passage 17 opening the valve stem storage chamber 5 to the atmospheric air is drilled in the housing 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、ＥＧＲバルブに関するものである。   The present invention relates to an EGR valve.

一般に、自動車のエンジンでは、エンジンの排気ラインから排出される排ガスの一部を、排気ラインと吸気ラインとの間の圧力差を利用して排ガス再循環路を介しエンジンの吸気ラインへと戻し、該吸気ラインに戻された排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の発生を低減するようにした、いわゆる排ガス再循環（Ｅｘｈａｕｓｔ Ｇａｓ Ｒｅｃｉｒｃｕｌａｔｉｏｎ）が行われており、前記排ガス再循環路の途中には、図２に一例を示す如きＥＧＲバルブが設けられている。   Generally, in an automobile engine, a part of exhaust gas discharged from the engine exhaust line is returned to the engine intake line through the exhaust gas recirculation path using a pressure difference between the exhaust line and the intake line. Exhaust gas recirculation (Exhaust Gas Recirculation) is performed in which the combustion of fuel in the engine is suppressed by the exhaust gas returned to the intake line and the combustion temperature is lowered to reduce the generation of NOx. In the middle of the exhaust gas recirculation path, an EGR valve as shown in FIG. 2 is provided.

図２中における１はＥＧＲバルブを構成するハウジングであって、該ハウジング１には、エンジンの排ガス再循環路２の途中に介装されるガス流路１ａと、該ガス流路１ａの途中に形成された開閉口３を開閉自在な弁体４ａと該弁体４ａに一体的に設けられ且つ前記ガス流路１ａ側からハウジング１壁面を貫通してハウジング１に形成したバルブステム収容室５へ延びるバルブステム４ｂとからなるバルブ本体４が配設され、該バルブ本体４のハウジング１に対する貫通部分には、バルブステム４ｂの軸線方向の動きを案内するバルブガイド６と、前記ガス流路１ａとバルブステム収容室５との間をシールして気密を保持するためのシール部材７が設けられている。   In FIG. 2, reference numeral 1 denotes a housing constituting an EGR valve. The housing 1 includes a gas passage 1a interposed in the middle of the exhaust gas recirculation passage 2 of the engine, and a gas passage 1a in the middle of the gas passage 1a. A valve body 4a that can freely open and close the formed opening / closing port 3 and a valve stem housing chamber 5 that is formed integrally with the valve body 4a and that is formed in the housing 1 through the wall surface of the housing 1 from the gas flow path 1a side. A valve body 4 composed of an extending valve stem 4b is disposed, and a valve guide 6 for guiding the movement of the valve stem 4b in the axial direction is provided at a portion of the valve body 4 that penetrates the housing 1, and the gas flow path 1a. A seal member 7 is provided for sealing between the valve stem housing chamber 5 and maintaining airtightness.

前記ハウジング１のバルブステム収容室５内には、前記バルブステム４ｂを引き上げて弁体４ａにより常時開閉口３を閉塞する方向に付勢するメインスプリング８が配置されている。   In the valve stem housing chamber 5 of the housing 1, there is disposed a main spring 8 that pulls up the valve stem 4b and urges the valve body 4a to always close the opening / closing port 3.

前記バルブステム収容室５の上部には、前記バルブ本体４をメインスプリング８の付勢力に抗して開方向（図２中下方向）へ移動せしめる電磁式のアクチュエータ９（電気式のアクチュエータ）が設けられており、より具体的には、このアクチュエータ９の外殻を成すケーシング１０内に、バルブステム４ｂの上端部を押すための押し棒１１に装着されたコア１２（鉄片）が案内部１３に沿って昇降可能に収容されており、前記コア１２を取り囲むようにケーシング１０内に備えたリニア電磁ソレノイド１４の電磁力によってバルブステム４ｂを適宜位置に進退動し得るようにしている。   An electromagnetic actuator 9 (electric actuator) that moves the valve body 4 in the opening direction (downward in FIG. 2) against the urging force of the main spring 8 is provided above the valve stem housing chamber 5. More specifically, a core 12 (iron piece) attached to a push rod 11 for pushing the upper end portion of the valve stem 4 b is placed in a casing 10 that forms the outer shell of the actuator 9. The valve stem 4b can be moved forward and backward to an appropriate position by the electromagnetic force of the linear electromagnetic solenoid 14 provided in the casing 10 so as to surround the core 12.

尚、図２中における１５は排ガス再循環路２を流れる排ガス、１６は押し棒１１の可動範囲を規制するストッパである。   In FIG. 2, 15 is exhaust gas flowing through the exhaust gas recirculation path 2, and 16 is a stopper that regulates the movable range of the push rod 11.

前述の如きＥＧＲバルブにおいては、バルブ本体４が図２の如く閉じた状態から、リニア電磁ソレノイド１４に通電してリニア電磁ソレノイド１４を作動させると、コア１２を有する押し棒１１がメインスプリング８の付勢力に抗してバルブステム４ｂを押すことによりバルブ本体４が僅かに開かれ、排ガス再循環路２を流れるエンジンの排ガス１５の一部がガス流路１ａを介してエンジンの吸気ラインに戻され、排ガス再循環が行われる。   In the EGR valve as described above, when the linear electromagnetic solenoid 14 is energized by operating the linear electromagnetic solenoid 14 from the state in which the valve body 4 is closed as shown in FIG. 2, the push rod 11 having the core 12 is connected to the main spring 8. By pushing the valve stem 4b against the urging force, the valve body 4 is slightly opened, and a part of the exhaust gas 15 of the engine flowing through the exhaust gas recirculation path 2 is returned to the engine intake line via the gas flow path 1a. And exhaust gas recirculation is performed.

また、前記リニア電磁ソレノイド１４によって更に押し棒１１を押し下げると、バルブステム４ｂがメインスプリング８の付勢力に抗して所要位置まで移動され、バルブ本体４が前述の場合より大きく開かれ、排ガス再循環量が前述の場合より多くなる。   Further, when the push rod 11 is further pushed down by the linear electromagnetic solenoid 14, the valve stem 4b is moved to a required position against the urging force of the main spring 8, and the valve body 4 is opened larger than the above case, so that the exhaust gas recycle is performed. The amount of circulation is greater than in the case described above.

上記したようなＥＧＲバルブにおいて、バルブ本体の開閉を電磁力を用いた電気アクチュエータで駆動するものは特許文献１に記載されている。また、バルブ本体の開閉を電動モータによりギヤを介して駆動するアクチュエータは特許文献２に示されている。更に、バルブ本体の開閉を電気式の直動アクチュエータで駆動するものは特許文献３に示されている。更に、バルブ本体の開閉を空気等の圧力流体で作動するピストンによって駆動するアクチュエータは特許文献４に記載されている。
特開平１１−１２５１５２号公報 特開平１１−６２７２４号公報 特開平１０−５００４６５号公報 特開２００１−９０６１７号公報 In the EGR valve as described above, a valve body that is opened and closed by an electric actuator using electromagnetic force is described in Patent Document 1. Patent Document 2 discloses an actuator that drives the opening and closing of a valve body by an electric motor through a gear. Further, Patent Document 3 discloses that a valve body is opened and closed by an electric linear actuator. Further, Patent Document 4 discloses an actuator that is driven by a piston that is operated by a pressure fluid such as air to open and close the valve body.
JP-A-11-125152 JP-A-11-62724 Japanese Patent Laid-Open No. 10-500465 JP 2001-90617 A

図２及び特許文献１〜４に示されるＥＧＲバルブにおいては、夫々図２に示す如く、バルブステム４ｂを移動させて弁体４ａによる開閉を行うためにバルブステム収容室５を備える必要があり、このバルブステム収容室５は一般にシール部材７によりシールされた密閉空間となっている。   In the EGR valve shown in FIG. 2 and Patent Documents 1 to 4, as shown in FIG. 2, it is necessary to provide the valve stem housing chamber 5 in order to move the valve stem 4b and open and close it by the valve body 4a. The valve stem storage chamber 5 is generally a sealed space sealed by a seal member 7.

しかし、バルブステム４ｂはハウジング１に対して移動する構成であるために、図２のＡ部を拡大して示した図３に示す如く、前記ガス流路１ａを流動する排ガス１５の一部が、バルブステム４ｂとバルブガイド６との隙間、及びバルブステム４ｂとシール部材７との隙間を通ってバルブステム収容室５に漏出する。バルブステム収容室５内に排ガス１５が漏出するとバルブステム収容室５内の圧力が高まり、これによってバルブステム収容室５内の排ガス１５が、例えば案内部１３とコア１２の隙間を通ってアクチュエータ９側に侵入する。アクチュエータ９側に排ガス１５が侵入すると、侵入した排ガス成分によってアクチュエータ９が故障を生じる可能性がある。特に、特許文献１の如く電磁力を用いて駆動する電気アクチュエータや、特許文献２の如く電動モータによりギヤを介して駆動するアクチュエータや、特許文献３の如く電気式の直動アクチュエータで駆動する方式等の電気式のアクチュエータにおいては、排ガス成分が電気式のアクチュエータに付着・堆積することによって誤作動を生じる可能性を有していた。   However, since the valve stem 4b is configured to move with respect to the housing 1, as shown in FIG. 3 in which the portion A of FIG. 2 is enlarged, a part of the exhaust gas 15 flowing through the gas flow path 1a is formed. Through the gap between the valve stem 4 b and the valve guide 6 and the gap between the valve stem 4 b and the seal member 7, it leaks into the valve stem housing chamber 5. When the exhaust gas 15 leaks into the valve stem storage chamber 5, the pressure in the valve stem storage chamber 5 increases, and thereby the exhaust gas 15 in the valve stem storage chamber 5 passes through the gap between the guide portion 13 and the core 12, for example. Break into the side. If the exhaust gas 15 enters the actuator 9 side, the actuator 9 may fail due to the intruded exhaust gas component. In particular, an electric actuator driven by electromagnetic force as in Patent Document 1, an actuator driven through a gear by an electric motor as in Patent Document 2, and a system driven by an electric linear actuator as in Patent Document 3 In the electric actuators such as the above, there is a possibility of causing a malfunction due to the exhaust gas component adhering to and depositing on the electric actuator.

本発明は上述の実情に鑑みてなしたもので、ハウジングのバルブステム収容室側に漏出した排ガスがアクチュエータ側に侵入するのを防止できるようにしたＥＧＲバルブを提供することを目的としている。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an EGR valve capable of preventing the exhaust gas leaked to the valve stem housing chamber side of the housing from entering the actuator side.

本発明の請求項１に記載の発明は、エンジンの排ガス再循環路途中に介装するためのガス流路を備えたハウジングと、該ハウジングのガス流路における適宜位置を開閉口として開閉する弁体を有し該弁体と一体のバルブステムがハウジングを貫通してハウジングに形成したバルブステム収容室に配置されたバルブ本体と、該バルブ本体のバルブステムに作用して弁体による開閉口の開閉操作を行わしめるアクチュエータとを備えたＥＧＲバルブにおいて、前記ハウジングに前記バルブステム収容室を大気に開放する排気流路を穿設したことを特徴とするＥＧＲバルブ、に係るものである。   The invention according to claim 1 of the present invention includes a housing having a gas flow path for interposing in the exhaust gas recirculation path of an engine, and a valve that opens and closes at an appropriate position in the gas flow path of the housing. A valve main body disposed in a valve stem housing chamber formed in the housing through the housing and a valve stem integral with the valve body, and an opening and closing port by the valve body acting on the valve stem of the valve main body The present invention relates to an EGR valve including an actuator for performing an opening / closing operation, wherein an exhaust passage for opening the valve stem housing chamber to the atmosphere is provided in the housing.

請求項２に記載の発明は、前記アクチュエータが、電動式アクチュエータであることを特徴とする請求項１に記載のＥＧＲバルブ、に係るものである。   The invention according to claim 2 relates to the EGR valve according to claim 1, wherein the actuator is an electric actuator.

而して、上記手段によれば、ガス流路の排ガスがバルブステム収容室側に漏出しても、バルブステム収容室に漏出した排ガスは排気流路を介して大気に排出される。従って、バルブステム収容室内部からアクチュエータ側に排ガスが侵入するのを防止できる。   Thus, according to the above means, even if the exhaust gas in the gas flow channel leaks to the valve stem storage chamber side, the exhaust gas leaked into the valve stem storage chamber is discharged to the atmosphere via the exhaust flow channel. Therefore, it is possible to prevent the exhaust gas from entering the actuator side from the inside of the valve stem housing chamber.

上記した本発明のＥＧＲバルブによれば、バルブステム収容室を大気に開放する排気流路をハウジングに形成したので、ガス流路の排ガスがバルブステム収容室側に漏出しても、バルブステム収容室に漏出した排ガスは排気流路を介して大気に排出され、よってバルブステム収容室内部からアクチュエータ側に排ガスが侵入する問題が防止でき、排ガスによるアクチュエータの故障・誤動作の問題を未然に防止できる効果がある。   According to the above-described EGR valve of the present invention, since the exhaust passage that opens the valve stem housing chamber to the atmosphere is formed in the housing, the valve stem housing is accommodated even if the exhaust gas in the gas passage leaks to the valve stem housing chamber side. Exhaust gas leaking into the chamber is exhausted to the atmosphere through the exhaust flow path, thus preventing the problem of exhaust gas entering the actuator side from the inside of the valve stem housing chamber and preventing problems of malfunction and malfunction of the actuator due to exhaust gas. effective.

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は本発明を実施する形態の一例を示すもので、図２、図３と同一の符号を付した部分は同一物を表わしている。   FIG. 1 shows an example of an embodiment for carrying out the present invention, and the portions denoted by the same reference numerals as those in FIGS. 2 and 3 represent the same items.

図１に示すように、前記図２、図３と略同様に構成したＥＧＲバルブにおいて、ハウジング１に、バルブステム収容室５を大気に開放する排気流路１７を穿設する。この排気流路１７は、ガス流路１ａからバルブステム収容室５に排ガスが漏出する経路より充分に大きな通路断面積になるように形成する。更に、前記排気流路１７は、バルブステム収容室５への異物の侵入を防止するために、バルブステム収容室５から斜め下方に向けて開口するよう傾斜させて設けることが好ましい。   As shown in FIG. 1, in the EGR valve configured substantially the same as in FIGS. 2 and 3, the housing 1 is provided with an exhaust passage 17 that opens the valve stem housing chamber 5 to the atmosphere. The exhaust passage 17 is formed to have a passage cross-sectional area sufficiently larger than a passage through which exhaust gas leaks from the gas passage 1a to the valve stem housing chamber 5. Further, the exhaust passage 17 is preferably provided so as to be inclined so as to open obliquely downward from the valve stem housing chamber 5 in order to prevent foreign matter from entering the valve stem housing chamber 5.

従って、上記形態例によれば、バルブ本体４の開閉作動によってガス流路１ａを流動する排ガス１５の一部が、バルブステム４ｂとバルブガイド６との隙間、及びバルブステム４ｂとシール部材７との隙間を通してバルブステム収容室５側に漏出しても、漏出した排ガス１５はそのまま排気流路１７を通って大気に排出されるようになる。従って、バルブステム収容室５内部の圧力が高まることはなく、バルブステム収容室５からアクチュエータ９側に排ガス１５が侵入するのが防止され、よって排ガス成分によってアクチュエータ９が故障する問題を未然に防止することができる。特に、電磁力を用いて駆動する電気アクチュエータや、電動モータによりギヤを介して駆動するアクチュエータや、電気式の直動アクチュエータで駆動する方式等の電気式のアクチュエータにおいては、排ガス成分の付着・堆積によって発生する可能性のある電気式のアクチュエータ９の誤動作を未然に防止することができる。   Therefore, according to the above embodiment, a part of the exhaust gas 15 flowing through the gas flow path 1a by the opening / closing operation of the valve body 4 is caused by the gap between the valve stem 4b and the valve guide 6 and the valve stem 4b and the seal member 7. Even if leaking to the valve stem storage chamber 5 side through the gap, the leaked exhaust gas 15 is directly discharged to the atmosphere through the exhaust passage 17. Therefore, the pressure inside the valve stem housing chamber 5 does not increase, and the exhaust gas 15 is prevented from entering the actuator 9 from the valve stem housing chamber 5, thereby preventing the actuator 9 from being damaged due to exhaust gas components. can do. In particular, in the case of electric actuators driven by electromagnetic force, actuators driven by gears with electric motors, and electric actuators driven by electric linear actuators, exhaust gas components adhere and accumulate. It is possible to prevent malfunction of the electric actuator 9 that may occur due to the above.

尚、本発明のＥＧＲバルブは、上述の形態例にのみ限定されるものではなく、アクチュエータには図示以外の構造を適用しても良いこと、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 valve of the present invention is not limited to the above-described embodiments. Various structures other than those shown in the drawings may be applied to the actuator, and various other modifications may be made without departing from the scope of the present invention. Of course, changes can be made.

本発明を実施する形態の一例を示す断面図である。It is sectional drawing which shows an example of the form which implements this invention. 従来のＥＧＲバルブの一例を示す断面図である。It is sectional drawing which shows an example of the conventional EGR valve | bulb. 図２におけるＡ部の拡大断面図である。It is an expanded sectional view of the A section in FIG.

符号の説明Explanation of symbols

１ ハウジング
１ａ ガス流路
２ 排ガス再循環路
３ 開閉口
４ バルブ本体
４ａ 弁体
４ｂ バルブステム
５ バルブステム収容室
９ アクチュエータ（電気式のアクチュエータ）
１５ 排ガス
１７ 排気流路 DESCRIPTION OF SYMBOLS 1 Housing 1a Gas flow path 2 Exhaust gas recirculation path 3 Opening and closing port 4 Valve body 4a Valve body 4b Valve stem 5 Valve stem storage chamber 9 Actuator (electric actuator)
15 Exhaust gas 17 Exhaust flow path

Claims (2)

エンジンの排ガス再循環路途中に介装するためのガス流路を備えたハウジングと、該ハウジングのガス流路における適宜位置を開閉口として開閉する弁体を有し該弁体と一体のバルブステムがハウジングを貫通してハウジングに形成したバルブステム収容室に配置されたバルブ本体と、該バルブ本体のバルブステムに作用して弁体による開閉口の開閉操作を行わしめるアクチュエータとを備えたＥＧＲバルブにおいて、前記ハウジングに前記バルブステム収容室を大気に開放する排気流路を穿設したことを特徴とするＥＧＲバルブ。   A valve stem integral with the valve body having a housing having a gas flow path for interposing in the exhaust gas recirculation path of the engine and a valve body that opens and closes at an appropriate position in the gas flow path of the housing EGR valve comprising: a valve body disposed in a valve stem housing chamber formed in the housing through the housing; and an actuator for operating the valve stem of the valve body to open and close the opening and closing port by the valve body The EGR valve according to claim 1, wherein an exhaust passage for opening the valve stem housing chamber to the atmosphere is formed in the housing. 前記アクチュエータが、電気式のアクチュエータであることを特徴とする請求項１に記載のＥＧＲバルブ。   The EGR valve according to claim 1, wherein the actuator is an electric actuator.
JP2004016765A 2004-01-26 2004-01-26 Egr valve Pending JP2005207360A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008008211A (en) * 2006-06-29 2008-01-17 Mitsubishi Electric Corp Egr valve and outside air communication device for egr valve
KR100897105B1 (en) * 2007-11-07 2009-05-14 현대자동차주식회사 Cylinder Head Structure of an Engine
JP2012127223A (en) * 2010-12-14 2012-07-05 Ud Trucks Corp Egr valve
JP2015068265A (en) * 2013-09-30 2015-04-13 三菱電機株式会社 Exhaust gas circulation valve

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008008211A (en) * 2006-06-29 2008-01-17 Mitsubishi Electric Corp Egr valve and outside air communication device for egr valve
JP4588669B2 (en) * 2006-06-29 2010-12-01 三菱電機株式会社 EGR valve and external air communication device for EGR valve
KR100897105B1 (en) * 2007-11-07 2009-05-14 현대자동차주식회사 Cylinder Head Structure of an Engine
JP2012127223A (en) * 2010-12-14 2012-07-05 Ud Trucks Corp Egr valve
JP2015068265A (en) * 2013-09-30 2015-04-13 三菱電機株式会社 Exhaust gas circulation valve

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