JP2009250174A - Exhaust gas reflux device in internal combustion engine - Google Patents

Exhaust gas reflux device in internal combustion engine Download PDF

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JP2009250174A
JP2009250174A JP2008101642A JP2008101642A JP2009250174A JP 2009250174 A JP2009250174 A JP 2009250174A JP 2008101642 A JP2008101642 A JP 2008101642A JP 2008101642 A JP2008101642 A JP 2008101642A JP 2009250174 A JP2009250174 A JP 2009250174A
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cooling water
exhaust gas
water passage
passage
valve
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JP5122352B2 (en
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Yukinori Tooyama
幸訓 遠山
Shiroshi Suzuki
素 鈴木
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Daihatsu Motor Co Ltd
Toyota Motor Corp
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Toyota Motor 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
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Abstract

<P>PROBLEM TO BE SOLVED: To improve cooling performance in a cooling water path in an exhaust gas reflux device comprising a cooling water path in a valve case 7 having a reflux control valve 5 in an exhaust gas reflux path 3 extended from an exhaust system to an air inlet system with a valve element 13 of the reflex control valve stored in a valve chamber 6 so as to surround the valve chamber. <P>SOLUTION: A cooling water path comprises, as viewed from the axial direction in a valve element, a first cooling water path 16 extended in the direction crossing the outside of a valve chamber for allowing entrance of cooling water from one end 16a, a second cooling water path 17 extended in the direction perpendicular to the first cooling water path outside the valve chamber from the terminal end 16b thereof, and a third cooling water path 18 extended from the terminal end in a direction perpendicular to the second cooling water path outside the terminal end with a cooling water outlet provided at its terminal end. At least one of the first cooling water path, the second cooling water path and the third cooling water path extends along the valve chamber, an exhaust gas inlet path 11 or an exhaust gas outlet path 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は，内燃機関において，その排気ガスの一部を吸気系に還流する排気ガス還流装置に関するものである。   The present invention relates to an exhaust gas recirculation device for recirculating a part of the exhaust gas to an intake system in an internal combustion engine.

前記した排気ガス還流装置は，内燃機関における排気系から吸気系に至る排気ガス還流通路に，還流制御弁を設けるという構成にしているが，前記還流制御弁は，これを流れる排気ガスにて高い温度になるから，その弁体を開閉作動する電磁ソレノイド又はステップモータ等のアクチェータに対して強い熱害が及ぶことになる。   The exhaust gas recirculation device described above is configured such that a recirculation control valve is provided in the exhaust gas recirculation passage from the exhaust system to the intake system in the internal combustion engine. However, the recirculation control valve is high in the exhaust gas flowing through it. Due to the temperature, a strong heat damage is applied to an actuator such as an electromagnetic solenoid or a step motor that opens and closes the valve body.

そこで，先行技術としての特許文献１及び２は，前記排気ガス還流制御弁を，内燃機関に対する冷却水にて強制的に冷却することを提案している。   Therefore, Patent Documents 1 and 2 as prior arts propose to forcibly cool the exhaust gas recirculation control valve with cooling water for the internal combustion engine.

前者の特許文献１は，前記排気ガス還流制御弁のうち制御用弁体を内蔵する弁室と，アクチェータとの間の部分に，冷却水通路を設けて，この冷却水通路に，内燃機関におけるシリンダヘッドから排出される冷却水の一部を流すという構成である。   In the former Patent Document 1, a cooling water passage is provided in a portion between the valve chamber containing the control valve body in the exhaust gas recirculation control valve and the actuator, and the cooling water passage is provided in the internal combustion engine. The cooling water discharged from the cylinder head is partly flowed.

後者の特許文献２は，前記排気ガス還流制御弁のうち弁室の部分に，冷却水通路を，前記弁室をその略半周にわたって囲うように設けて，この冷却水通路に，内燃機関におけるシリンダヘッドから排出される冷却水の一部を流すという構成である。
特開平７−１０３０８３号公報 特開２０００−８７８０７号公報 In the latter patent document 2, a cooling water passage is provided in a portion of a valve chamber of the exhaust gas recirculation control valve so as to surround the valve chamber over a substantially half circumference, and a cylinder in an internal combustion engine is provided in the cooling water passage. In this configuration, a part of the cooling water discharged from the head is allowed to flow.
JP-A-7-103083 JP 2000-87807 A

前者の構成によると，弁室とアクチェータとの間の部位に設けた冷却水通路は，アクチェータに対する熱害阻止に寄与できるものの，その反面，同時に，排気ガスを冷却する効果が低いという問題がある。   According to the former configuration, the cooling water passage provided in the region between the valve chamber and the actuator can contribute to preventing thermal damage to the actuator, but at the same time, there is a problem that the effect of cooling the exhaust gas is low. .

一方，後者の構成によると，弁室に対する冷却水通路は，アクチェータに対する熱害阻止と，排気ガスの冷却との両方に寄与することができるものの，この冷却水通路は前記弁室を略半周にわたって囲うものに過ぎないから，排気ガスの冷却が不十分であり，しかも，前記冷却水通路の全体を，鋳造に際しての中子型による鋳抜きにて形成してことにより，製造コストが嵩むばかりか，全体が，前記冷却水通路を鋳抜きにするだけ大型化するという問題がある。   On the other hand, according to the latter configuration, the cooling water passage for the valve chamber can contribute to both the heat damage prevention for the actuator and the cooling of the exhaust gas. Since it is only an enclosure, cooling of the exhaust gas is insufficient, and the entire cooling water passage is formed by casting with a core mold at the time of casting, which increases the manufacturing cost. As a whole, there is a problem that the cooling water passage is enlarged only by casting.

本発明は，これらの問題を解消した排気ガス還流制御弁を提供することを技術的課題とするものである。   An object of the present invention is to provide an exhaust gas recirculation control valve that solves these problems.

この技術的課題を達成するため本発明の請求項１は，
「内燃機関における排気系から吸気系に至る排気ガス還流通路に還流制御弁を設け，この還流制御弁のうち弁体を内蔵の弁室を備えた弁ケースに，冷却水通路を，前記弁室を囲うように設けて成る排気ガス還流装置において，
前記冷却水通路は，前記弁体における軸線方向から見て，前記弁室の外側を横切る方向に延びて一端に冷却水入口を有する第１冷却水通路と，この第１冷却水通路の終端から前記弁室の外側を前記第１冷却水通路と実質的に直角の方向に延びる第２冷却水通路と，この第２冷却水通路の終端から前記弁室の外側を前記第２冷却水通路と実質的に直角の方向に延びて終端に冷却水出口を備えた第３冷却水通路とで構成されており，更に，前記第１冷却水通路，前記第２冷却水通路及び前記第３冷却水通路のうち少なくとも一つは，前記弁室，又は前記弁室への排気ガス入口通路，或いは前記弁室からの排気ガス出口通路に沿って延びている。」
ことを特徴としている。 In order to achieve this technical problem, claim 1 of the present invention provides:
“A recirculation control valve is provided in an exhaust gas recirculation passage from an exhaust system to an intake system in an internal combustion engine, and a cooling water passage is connected to the valve chamber in a valve case having a valve chamber with a built-in valve body. In the exhaust gas recirculation device provided so as to surround
The cooling water passage extends in a direction crossing the outside of the valve chamber when viewed from the axial direction of the valve body, and includes a first cooling water passage having a cooling water inlet at one end, and an end of the first cooling water passage. A second cooling water passage extending outside the valve chamber in a direction substantially perpendicular to the first cooling water passage; and a second cooling water passage extending from the end of the second cooling water passage to the outside of the valve chamber. A third cooling water passage extending in a substantially right-angle direction and having a cooling water outlet at its end, and further comprising the first cooling water passage, the second cooling water passage, and the third cooling water. At least one of the passages extends along the valve chamber, an exhaust gas inlet passage to the valve chamber, or an exhaust gas outlet passage from the valve chamber. "
It is characterized by that.

本発明の請求項２は，
「前記請求項１の記載において，前記還流制御弁における弁ケースには，内燃機関におけるシリンダヘッドへの取付け面が設けられ，この取付け面には，前記弁室への排気ガス入口通路が，前記シリンダヘッドにおける排気ガス還流通路に連通するように開口するとともに，前記第１冷却水通路への冷却水入口が，前記シリンダヘッドにおける冷却水ジャケットに連通するように開口しており，更に，前記シリンダヘッドのうち前記取付け面部分及び前記取付け面のいずれか一方又は両方には，前記第１冷却水通路が，溝型通路の形態にして設けられている。」
ことを特徴としている。 Claim 2 of the present invention includes:
“In the first aspect of the present invention, the valve case in the recirculation control valve is provided with a mounting surface to a cylinder head in an internal combustion engine, and an exhaust gas inlet passage to the valve chamber is provided on the mounting surface. The cylinder head is opened to communicate with the exhaust gas recirculation passage, the cooling water inlet to the first cooling water passage is opened to communicate with the cooling water jacket in the cylinder head, and the cylinder The first cooling water passage is provided in the form of a groove-type passage on one or both of the attachment surface portion and the attachment surface of the head.
It is characterized by that.

本発明の請求項３は，
「前記請求項２の記載において，前記第２冷却水通路は，前記取付け面からのドリル加工によって形成され，前記第３冷却水通路は，その終端の冷却水出口からのドリル加工によって形成されている。」
ことを特徴としている。 Claim 3 of the present invention provides:
“In the second aspect of the present invention, the second cooling water passage is formed by drilling from the mounting surface, and the third cooling water passage is formed by drilling from the cooling water outlet at the end thereof. Yes. "
It is characterized by that.

前記請求項１によると，還流制御弁における弁室は，弁体の軸線方向から見て，第１冷却水通路，第２冷却水通路及び第３冷却水通路とによって，コ字状に囲われた状態になっているから，前記還流制御弁のうち前記弁室の部分における冷却を促進できる。   According to the first aspect, the valve chamber of the reflux control valve is enclosed in a U-shape by the first cooling water passage, the second cooling water passage, and the third cooling water passage as seen from the axial direction of the valve body. Therefore, the cooling of the valve chamber portion of the reflux control valve can be promoted.

これに加えて，前記第１冷却通路，前記第２冷却水通路及び前記第３冷却水通路のうち少なくとも一つが，前記弁室，又は前記弁室への排気ガス入口通路，或いは前記弁室からの排気ガス出口通路に沿って延びていることにより，この部分においても排気ガスの冷却水による冷却を促進できるから，還流制御弁における電磁ソレノイド又はステップモータ等のアクチェータに対する確実な熱害阻止と，排気ガスの冷却性の大幅な向上とを同時に達成できる。   In addition, at least one of the first cooling passage, the second cooling water passage, and the third cooling water passage is provided from the valve chamber, the exhaust gas inlet passage to the valve chamber, or the valve chamber. In this part, the cooling by the cooling water of the exhaust gas can be promoted by extending along the exhaust gas outlet passage, so that reliable heat damage prevention for the actuator such as an electromagnetic solenoid or a step motor in the reflux control valve, A significant improvement in the exhaust gas cooling performance can be achieved at the same time.

また，請求項２によると，前記還流制御弁のシリンダヘッドに対する取付けと同時に，当該還流制御弁における弁室及び第１冷却水通路を，前記シリンダヘッドにおける排気ガス還流通路及び冷却水ジャケットに連通できて，その接続構成が著しく簡単になることに加えて，少なくとも前記第１冷却水通路を中子型を使用することなく形成できるから，コストの大幅な低減を達成できる。   According to claim 2, the valve chamber and the first coolant passage in the reflux control valve can be communicated with the exhaust gas return passage and the coolant jacket in the cylinder head simultaneously with the attachment of the reflux control valve to the cylinder head. In addition to remarkably simplifying the connection configuration, at least the first cooling water passage can be formed without using a core type, so that a significant reduction in cost can be achieved.

更にまた，請求項３によると，前記第１冷却水通路を中子型を使用することなく形成できることに加えて，第２冷却水通路及び第３冷却水通路をドリル加工にて形成できるから，コストの更なる低減を図ることができる。   Furthermore, according to claim 3, in addition to being able to form the first cooling water passage without using a core mold, the second cooling water passage and the third cooling water passage can be formed by drilling. Costs can be further reduced.

以下，本発明の実施の形態を，図１〜図４の図面について説明する。   Hereinafter, embodiments of the present invention will be described with reference to FIGS.

これらの図において，符号１は，内燃機関におけるシリンダヘッドを示し，このシリンダヘッド１における一つの側面２には，当該シリンダヘッド１の内部に設けられている排
気ガス還流通路３の一端部３ａが開口しているとともに，当該シリンダヘッド１の内部に設けられている冷却水ジャケット４からの冷却水出口４ａが開口している。 In these drawings, reference numeral 1 denotes a cylinder head in an internal combustion engine. One side surface 2 of the cylinder head 1 has an end 3a of an exhaust gas recirculation passage 3 provided in the cylinder head 1. The cooling water outlet 4a from the cooling water jacket 4 provided inside the cylinder head 1 is opened.

なお，前記排気ガス還流通路３の他端は，前記シリンダヘッド１の内部に設けられている排気ポート（図示せず）又はこの排気ポートに接続される排気マニホールド（図示せず）に連通している。   The other end of the exhaust gas recirculation passage 3 communicates with an exhaust port (not shown) provided in the cylinder head 1 or an exhaust manifold (not shown) connected to the exhaust port. Yes.

前記各図において，符号５は，還流制御弁を示し，この還流制御弁５は，内部に弁室６を形成して成る弁ケース７を備え，この弁ケース７は，前記シリンダヘッド１における側面２に対して，当該弁ケース７に一体に設けた取付け座部８を，当該取付け座部８における取付け面８ａとの間にシール用のガスケット９を挟んだ状態で，複数本のボルト１０にて締結することにより，着脱可能に取付けられている。   In each of the drawings, reference numeral 5 denotes a recirculation control valve. The recirculation control valve 5 includes a valve case 7 having a valve chamber 6 formed therein, and the valve case 7 is a side surface of the cylinder head 1. 2, the mounting seat 8 provided integrally with the valve case 7 is attached to a plurality of bolts 10 with a sealing gasket 9 sandwiched between the mounting seat 8 and the mounting surface 8 a of the mounting seat 8. It is attached detachably by fastening.

前記弁ケース７における弁室６内には，当該弁室６への排気ガス入口通路１１と，当該弁室６からの排気ガス出口通路１２とが連通していることに加えて，弁体１３が設けられ，この弁体１３は，前記弁ケース７の上部に取付けた電磁ソレノイド又はステップモータ等のアクチェータ１４にて開閉作動される。   In the valve chamber 6 of the valve case 7, an exhaust gas inlet passage 11 to the valve chamber 6 and an exhaust gas outlet passage 12 from the valve chamber 6 communicate with each other. The valve element 13 is opened and closed by an actuator 14 such as an electromagnetic solenoid or a step motor attached to the upper part of the valve case 7.

前記排気ガス入口通路１１は，前記取付け座部８のうち前記シリンダヘッド１の側面２への取付け面８ａに開口し，前記弁ケース７のシリンダヘッド１に対する取付けと同時に前記排気ガス還流通路３に連通するように構成されている。   The exhaust gas inlet passage 11 opens to a mounting surface 8a of the mounting seat portion 8 on the side surface 2 of the cylinder head 1, and enters the exhaust gas recirculation passage 3 simultaneously with the mounting of the valve case 7 to the cylinder head 1. It is configured to communicate.

一方，前記排気ガス出口通路１２は，前記弁室６から斜め上向きの方向に直線状に延びて，前記弁ケース１２の上部側面に一体に設けたフランジ部１５における接合面１５ａに開口しており，この排気ガス出口通路１２には，図示していないが，吸気マニホールドへの排気ガス還流管路が接続される。   On the other hand, the exhaust gas outlet passage 12 extends linearly from the valve chamber 6 in an obliquely upward direction, and opens to a joint surface 15a in a flange portion 15 provided integrally with the upper side surface of the valve case 12. The exhaust gas outlet passage 12 is connected to an exhaust gas recirculation pipe line to the intake manifold (not shown).

そして，前記還流制御弁５における弁ケース７のうち前記弁室６の部分には，第１冷却水通路１６，第２冷却水通路１７及び第３冷却水通路１８が，図３に示すように，前記弁体１３における軸線方向から見て，前記弁室６の外側をコ字状に囲うように設けられている。   The first cooling water passage 16, the second cooling water passage 17, and the third cooling water passage 18 are provided in the valve chamber 6 of the valve case 7 of the reflux control valve 5, as shown in FIG. As seen from the axial direction of the valve body 13, the outside of the valve chamber 6 is provided so as to surround the U-shape.

すなわち，前記第１冷却水通路１６は，前記取付け面８ａに，溝型通路の形態にして凹み形成され，前記弁体１３の軸線方向から見て，前記弁室６の外側を横切る方向に延びており，その始端１６ａには，前記シリンダヘッド１の冷却水ジャケット４における冷却水出口４ａが連通している。   That is, the first cooling water passage 16 is formed in a concave shape in the form of a groove-type passage on the mounting surface 8a, and extends in a direction crossing the outside of the valve chamber 6 when viewed from the axial direction of the valve body 13. The cooling water outlet 4a in the cooling water jacket 4 of the cylinder head 1 communicates with the starting end 16a.

この第１冷却水通路１６における溝幅寸法は，前記始端１６ａにおいて拡大されていて，前記シリンダヘッド１に対する還流制御弁５の取付け位置の寸法誤差を吸収するとともに，前記シリンダヘッド１から前記第１冷却水通路１６内への冷却水の流入抵抗を低減するように構成されている。   The groove width dimension in the first cooling water passage 16 is enlarged at the start end 16a to absorb a dimensional error in the attachment position of the reflux control valve 5 with respect to the cylinder head 1 and from the cylinder head 1 to the first. The inflow resistance of the cooling water into the cooling water passage 16 is reduced.

なお，この第１冷却水通路１６は，前記シリンダヘッド１における側面２のうち前記取付け面８ａの部分に凹み形成した溝型通路の形態にしたり，或いは，前記シリンダヘッド１における側面２及び前記取付け面８ａとの両方に凹み形成した溝型通路の形態にしたりすることができる。また，これらの溝型通路は，弁ケース７及びシリンダヘッド１の鋳造の際に鋳型によって形成できるほか，鋳造後における機械加工によっても形成できる。   The first cooling water passage 16 may be formed in the form of a groove-type passage that is recessed in the mounting surface 8a of the side surface 2 of the cylinder head 1, or the side surface 2 of the cylinder head 1 and the mounting surface. For example, it may be in the form of a groove-type passage that is recessed in both the surface 8a. These groove-type passages can be formed by casting when the valve case 7 and the cylinder head 1 are cast, and can also be formed by machining after casting.

前記第２冷却水通路１７は，前記第１冷却水通路１６における終端１６ｂから前記弁室６の外側を前記弁体１３の軸線方向から見て前記第１冷却水通路１６と実質的に直角の方
向に延びており，この第２冷却水通路１７は，図３に二点鎖線で示すように，前記第１冷却水通路１６における終端１６ｂからのドリルＡによるドリル加工にて穿設される。 The second cooling water passage 17 is substantially perpendicular to the first cooling water passage 16 when the outside of the valve chamber 6 is viewed from the axial direction of the valve body 13 from the end 16b of the first cooling water passage 16. The second cooling water passage 17 is formed by drilling with a drill A from the end 16b of the first cooling water passage 16 as shown by a two-dot chain line in FIG.

前記第３冷却水通路１８は，前記第２冷却水通路１７における終端１７ａから前記弁室６の外側を前記弁体１３の軸線方向から見て前記第２冷却水通路１７と実質的に直角の方向に延びて，その終端における冷却水出口１８ａが前記フランジ部１５における接合面１５ａに開口しており，この第３冷却水通路１８は，図３に二点鎖線で示すように，前記フランジ部１５における接合面１５ａからのドリルＢによるドリル加工にて穿設される。   The third cooling water passage 18 is substantially perpendicular to the second cooling water passage 17 when the outside of the valve chamber 6 is viewed from the end 17 a of the second cooling water passage 17 in the axial direction of the valve body 13. The cooling water outlet 18a at the end of the flange portion 15 is open to the joint surface 15a of the flange portion 15, and the third cooling water passage 18 is formed in the flange portion as shown by a two-dot chain line in FIG. 15 is drilled by drilling with a drill B from the joint surface 15a.

更に，この第３冷却水通路１８は，図３及び図４に示すように，前記弁室６からの排気ガス出口通路１２に沿ってこれと略平行に延びており，その終端における冷却水出口１８ａには，ラジエータ（図示せず）を経て冷却水ポンプ（図示せず）への冷却水循環管路１９が接合されている。   Further, as shown in FIGS. 3 and 4, the third cooling water passage 18 extends substantially parallel to the exhaust gas outlet passage 12 from the valve chamber 6 and has a cooling water outlet at its end. A cooling water circulation pipe 19 to a cooling water pump (not shown) is joined to 18a via a radiator (not shown).

この構成において，前記シリンダヘッド１の冷却水ジャケット４における冷却水は，前記還流制御弁５における前記第１冷却水通路１６内の始端に入り，この第１冷却水通路１６内を流れ，次いで，前記第２冷却水通路１７内を流れ，そして，前記第３冷却水通路１８内を流れることにより，前記還流制御弁５における弁ケース７の冷却と，排気ガスの冷却とを同時に行うことができる。   In this configuration, the cooling water in the cooling water jacket 4 of the cylinder head 1 enters the start end in the first cooling water passage 16 in the reflux control valve 5 and flows in the first cooling water passage 16. By flowing in the second cooling water passage 17 and in the third cooling water passage 18, the cooling of the valve case 7 and the exhaust gas in the reflux control valve 5 can be performed simultaneously. .

特に，前記第１冷却水通路１６，前記第２冷却水通路１７及び前記第３冷却水通路１８うち少なくとも前記第３冷却水通路１８は，前記還流制御弁５における弁室６からの排気ガス出口通路１２に沿って延びていることにより，前記第３冷却水通路１８と前記排気ガス出口通路１２との間における熱交換をより積極的に促進できる。   In particular, at least the third cooling water passage 18 among the first cooling water passage 16, the second cooling water passage 17, and the third cooling water passage 18 is an exhaust gas outlet from the valve chamber 6 in the reflux control valve 5. By extending along the passage 12, heat exchange between the third cooling water passage 18 and the exhaust gas outlet passage 12 can be more actively promoted.

なお，前記実施の形態に代えて，前記第１冷却水通路１６，前記第２冷却水通路１７及び前記第３冷却水通路１８うち少なくとも一つを，前記弁室６，又は前記排気ガス入口通路１１，或いは前記排気ガス出口通路１２に沿って延びる構成にすることができる。   In place of the embodiment, at least one of the first cooling water passage 16, the second cooling water passage 17, and the third cooling water passage 18 is used as the valve chamber 6, or the exhaust gas inlet passage. 11 or a configuration extending along the exhaust gas outlet passage 12.

また，前記実施例において，排気ガス入口通路１１，排気ガス出口通路１２，弁室６についても中子を使わずにドリル等の切削加工にて形成することができ，冷却水通路と合せて，制御弁全体を中子なしで作成することができる。   In the embodiment, the exhaust gas inlet passage 11, the exhaust gas outlet passage 12, and the valve chamber 6 can also be formed by cutting such as a drill without using a core, and together with the cooling water passage, The entire control valve can be created without a core.

本発明の実施の形態を示す正面図である。It is a front view which shows embodiment of this invention. 図１のII−II視断面図である。FIG. 2 is a sectional view taken along line II-II in FIG. 1. 図１のIII −III 視断面図である。FIG. 3 is a sectional view taken along line III-III in FIG. 1. 図２のIV−IV視断面図である。FIG. 4 is a sectional view taken along line IV-IV in FIG. 2.

符号の説明Explanation of symbols

１ シリンダヘッド
２ シリンダヘッドの側面
３ 排気ガス還流通路
４ 冷却水ジャケット
５ 還流制御弁
６ 弁室
７ 弁ケース
８ 取付け座部
８ａ 取付け面
１１ 排気ガス入口通路
１２ 排気ガス出口通路
１３ 弁体
１６ 第１冷却水通路
１７ 第２冷却水通路
１８ 第３冷却水通路 DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Side surface of cylinder head 3 Exhaust gas recirculation passage 4 Cooling water jacket 5 Recirculation control valve 6 Valve chamber 7 Valve case 8 Mounting seat 8a Mounting surface 11 Exhaust gas inlet passage 12 Exhaust gas outlet passage 13 Valve body 16 1st Cooling water passage 17 Second cooling water passage 18 Third cooling water passage

Claims (3)

内燃機関における排気系から吸気系に至る排気ガス還流通路に還流制御弁を設け，この還流制御弁のうち弁体を内蔵の弁室を備えた弁ケースに，冷却水通路を，前記弁室を囲うように設けて成る排気ガス還流装置において，
前記冷却水通路は，前記弁体における軸線方向から見て，前記弁室の外側を横切る方向に延びて一端に冷却水入口を有する第１冷却水通路と，この第１冷却水通路の終端から前記弁室の外側を前記第１冷却水通路と実質的に直角の方向に延びる第２冷却水通路と，この第２冷却水通路の終端から前記弁室の外側を前記第２冷却水通路と実質的に直角の方向に延びて終端に冷却水出口を備えた第３冷却水通路とで構成されており，更に，前記第１冷却水通路，前記第２冷却水通路及び前記第３冷却水通路のうち少なくとも一つは，前記弁室，又は前記弁室への排気ガス入口通路，或いは前記弁室からの排気ガス出口通路に沿って延びていることを特徴とする内燃機関における排気ガス還流装置。 A recirculation control valve is provided in an exhaust gas recirculation passage from an exhaust system to an intake system in an internal combustion engine, and a cooling water passage is provided in a valve case including a valve chamber having a valve body built in the recirculation control valve. In an exhaust gas recirculation device provided to surround,
The cooling water passage extends in a direction crossing the outside of the valve chamber when viewed from the axial direction of the valve body, and includes a first cooling water passage having a cooling water inlet at one end, and an end of the first cooling water passage. A second cooling water passage extending outside the valve chamber in a direction substantially perpendicular to the first cooling water passage; and a second cooling water passage extending from the end of the second cooling water passage to the outside of the valve chamber. A third cooling water passage extending in a substantially perpendicular direction and having a cooling water outlet at the end thereof, and further comprising the first cooling water passage, the second cooling water passage, and the third cooling water. At least one of the passages extends along the valve chamber, an exhaust gas inlet passage to the valve chamber, or an exhaust gas outlet passage from the valve chamber. apparatus. 前記請求項１の記載において，前記還流制御弁における弁ケースには，内燃機関におけるシリンダヘッドへの取付け面が設けられ，この取付け面には，前記弁室への排気ガス入口通路が，前記シリンダヘッドにおける排気ガス還流通路に連通するように開口するとともに，前記第１冷却水通路への冷却水入口が，前記シリンダヘッドにおける冷却水ジャケットに連通するように開口しており，更に，前記シリンダヘッドのうち前記取付け面部分及び前記取付け面のいずれか一方又は両方には，前記第１冷却水通路が，溝型通路の形態にして設けられていることを特徴とする内燃機関における排気ガス還流装置。   2. The valve case of the reflux control valve according to claim 1, wherein a mounting surface for a cylinder head in an internal combustion engine is provided on the valve case, and an exhaust gas inlet passage to the valve chamber is provided on the mounting surface. An opening is formed to communicate with an exhaust gas recirculation passage in the head, a cooling water inlet to the first cooling water passage is opened to communicate with a cooling water jacket in the cylinder head, and the cylinder head The exhaust gas recirculation device in an internal combustion engine, wherein the first cooling water passage is provided in the form of a groove-type passage on one or both of the attachment surface portion and the attachment surface. . 前記請求項２の記載において，前記第２冷却水通路は，前記取付け面からのドリル加工によって形成され，前記第３冷却水通路は，その終端の冷却水出口からのドリル加工によって形成されていることを特徴とする内燃機関における排気ガス還流装置。   The second cooling water passage is formed by drilling from the mounting surface, and the third cooling water passage is formed by drilling from a cooling water outlet at the end thereof. An exhaust gas recirculation device for an internal combustion engine.
JP2008101642A 2008-04-09 2008-04-09 Exhaust gas recirculation device in internal combustion engine Expired - Fee Related JP5122352B2 (en)

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JP2012077705A (en) * 2010-10-04 2012-04-19 Denso Corp Exhaust gas recirculation valve
JP2013015126A (en) * 2011-07-06 2013-01-24 Daihatsu Motor Co Ltd Egr valve cooling structure
US9062636B2 (en) 2009-11-18 2015-06-23 Mitsubishi Electric Corporation Drop-in type of exhaust gas recirculation valve, and system for attaching same
JP2021011823A (en) * 2019-07-03 2021-02-04 スズキ株式会社 Vehicular engine
JP2021011822A (en) * 2019-07-03 2021-02-04 スズキ株式会社 Vehicular engine

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JP2000087807A (en) * 1998-09-10 2000-03-28 Yamaha Motor Co Ltd Egr valve device for cylinder injection type engine
JP2002349360A (en) * 2001-05-28 2002-12-04 Mitsubishi Electric Corp Exhaust gas recirculation valve

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JP2000087807A (en) * 1998-09-10 2000-03-28 Yamaha Motor Co Ltd Egr valve device for cylinder injection type engine
JP2002349360A (en) * 2001-05-28 2002-12-04 Mitsubishi Electric Corp Exhaust gas recirculation valve

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9062636B2 (en) 2009-11-18 2015-06-23 Mitsubishi Electric Corporation Drop-in type of exhaust gas recirculation valve, and system for attaching same
JP2012077705A (en) * 2010-10-04 2012-04-19 Denso Corp Exhaust gas recirculation valve
JP2013015126A (en) * 2011-07-06 2013-01-24 Daihatsu Motor Co Ltd Egr valve cooling structure
JP2021011823A (en) * 2019-07-03 2021-02-04 スズキ株式会社 Vehicular engine
JP2021011822A (en) * 2019-07-03 2021-02-04 スズキ株式会社 Vehicular engine
JP7251367B2 (en) 2019-07-03 2023-04-04 スズキ株式会社 vehicle engine
JP7251366B2 (en) 2019-07-03 2023-04-04 スズキ株式会社 vehicle engine

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