JP4936008B2 - Exhaust gas purification device for internal combustion engine - Google Patents

Exhaust gas purification device for internal combustion engine Download PDF

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JP4936008B2
JP4936008B2 JP2008047168A JP2008047168A JP4936008B2 JP 4936008 B2 JP4936008 B2 JP 4936008B2 JP 2008047168 A JP2008047168 A JP 2008047168A JP 2008047168 A JP2008047168 A JP 2008047168A JP 4936008 B2 JP4936008 B2 JP 4936008B2
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injection valve
internal combustion
combustion engine
exhaust
catalyst
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JP2009203894A (en
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洋之 木村
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Mitsubishi Motors 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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    • Y02T10/40—Engine management systems

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Description

本発明は、排気通路に設けられた触媒に添加剤を供給する添加剤噴射弁を備えた内燃機関の排気浄化装置に関する。   The present invention relates to an exhaust emission control device for an internal combustion engine including an additive injection valve that supplies an additive to a catalyst provided in an exhaust passage.

ディーゼルエンジンの排気通路には、排気中に含まれるＮＯｘ（窒素酸化物）やパティキュレートマター（以下、ＰＭという）が大気への放出されるのを防ぐため、ＮＯｘトラップ触媒や選択還元型ＮＯｘ触媒、ディーゼルパティキュレートフィルタ（以下、ＤＰＦという）等が設けられている。
当該ＮＯｘトラップ触媒のＮＯｘ吸蔵量やＤＰＦのＰＭ捕集量には限界があり、吸蔵されたＮＯｘを放出還元させる所謂ＮＯｘパージや、ＤＰＦに捕集されたＰＭを焼却除去する所謂強制再生を行う必要がある。 In the exhaust passage of a diesel engine, a NOx trap catalyst or a selective reduction type NOx catalyst is used to prevent NOx (nitrogen oxide) and particulate matter (hereinafter referred to as PM) contained in the exhaust from being released into the atmosphere. A diesel particulate filter (hereinafter referred to as DPF) and the like are provided.
The NOx trapping amount of the NOx trap catalyst and the amount of PM trapped by the DPF are limited, so-called NOx purge for releasing and reducing the stored NOx and so-called forced regeneration for burning and removing the PM trapped by the DPF are performed. There is a need.

そこで、ＮＯｘトラップ触媒やＤＰＦの排気上流側に酸化触媒を設け、当該酸化触媒に向け燃料等の添加剤を供給し、当該酸化触媒における酸化反応を利用してＮＯｘパージや強制再生を行う構成がある。
また、当該酸化触媒への燃料の供給には、当該酸化触媒の排気上流側に燃料添加インジェクタを設けて、当該燃料添加インジェクタより燃料を噴射する構成がある。 Therefore, there is a configuration in which an oxidation catalyst is provided upstream of the NOx trap catalyst or the DPF, an additive such as fuel is supplied to the oxidation catalyst, and NOx purge or forced regeneration is performed using an oxidation reaction in the oxidation catalyst. is there.
Further, the supply of fuel to the oxidation catalyst has a configuration in which a fuel addition injector is provided on the exhaust upstream side of the oxidation catalyst and fuel is injected from the fuel addition injector.

一方、選択還元型ＮＯｘ触媒において、ＮＯｘを還元処理するために当該選択還元型ＮＯｘ触媒に向けて尿素水等の還元剤を供給する必要がある。
そこで、当該還元型ＮＯｘ触媒の上流に尿素添加インジェクタを設けて、当該尿素添加インジェクタより尿素水を噴射する構成もある。
例えば、排気浄化用触媒の排気上流側にある屈曲部の曲がり方向外側に、燃料添加インジェクタを付設するとともに、当該燃料添加インジェクタのノズル先端部から屈曲部下流の排気管に沿う方向に向け噴射空間を形成し、当該噴射空間を介して屈曲部下流の排気管内の流路に燃料を噴射する構成が開示されている（特許文献１参照）。
特開２００４−１９７６３５号公報 On the other hand, in a selective reduction type NOx catalyst, it is necessary to supply a reducing agent such as urea water toward the selective reduction type NOx catalyst in order to reduce NOx.
Therefore, there is also a configuration in which a urea addition injector is provided upstream of the reduced NOx catalyst and urea water is injected from the urea addition injector.
For example, a fuel addition injector is attached outside the bending direction of the bent portion on the exhaust upstream side of the exhaust purification catalyst, and the injection space is directed from the nozzle tip of the fuel addition injector to the direction along the exhaust pipe downstream of the bent portion. Is formed, and fuel is injected into the flow path in the exhaust pipe downstream of the bent portion through the injection space (see Patent Document 1).
JP 2004-197635 A

しかしながら、上記特許文献１に開示された技術のように、燃料添加インジェクタは排気管から離間させた位置にあり、燃料添加インジェクタが僅かでも軸方向に回動して設けられた場合等には、ノズル先端から噴射される燃料噴射の向きにずれが生じ、噴射経路の内壁に燃料が多量に付着し、適正に排気浄化触媒に燃料を添加することができないという問題がある。   However, as in the technique disclosed in Patent Document 1, the fuel addition injector is located at a position separated from the exhaust pipe, and when the fuel addition injector is slightly rotated in the axial direction, etc. There is a problem that the direction of fuel injection injected from the nozzle tip is deviated, a large amount of fuel adheres to the inner wall of the injection path, and the fuel cannot be properly added to the exhaust purification catalyst.

つまり、燃料噴射方向を適正なものとするためには、燃料添加インジェクタの組み付けに際して位置決めの精度を高くする必要がある。
本発明はこのような問題を解決するためになされたもので、その目的とするところは、触媒へ添加剤を供給する添加剤噴射弁において、位置決めにおける精度を高くする必要なく容易な作業で適正な位置に組み付けることができ、排気浄化装置の機能性を十分に確保することのできる内燃機関の排気浄化装置を提供することにある。 In other words, in order to make the fuel injection direction appropriate, it is necessary to increase the positioning accuracy when the fuel addition injector is assembled.
The present invention has been made to solve such problems, and the object of the present invention is to provide an additive injection valve for supplying an additive to a catalyst, which is suitable for easy operation without the need for increasing the accuracy in positioning. It is an object of the present invention to provide an exhaust gas purification device for an internal combustion engine that can be assembled at a proper position and can sufficiently ensure the functionality of the exhaust gas purification device.

上記した目的を達成するために、請求項１の内燃機関の排気浄化装置では、内燃機関の排気管内に設けられた触媒と、前記排気管に設けられ前記触媒に供給する添加剤を噴射する添加剤噴射弁と、一側端部が付勢手段により付勢されて前記添加剤噴射弁を挟持し、該一側端部と離間した位置で互いに回動自在に枢支された一対の挟持片から構成され、該添加剤噴射弁の軸周りにおける所定の向きで該添加剤噴射弁を固定する固定部材とを備えたことを特徴としている。 In order to achieve the above object, in the exhaust gas purification apparatus for an internal combustion engine according to claim 1, an addition for injecting a catalyst provided in an exhaust pipe of the internal combustion engine and an additive provided in the exhaust pipe and supplied to the catalyst. agent injection valve, and sandwiching the additive injection valve is urged by the urging means one end, a pair of holding pieces which are rotatably supported to each other at a position apart from said one end And a fixing member for fixing the additive injection valve in a predetermined direction around the axis of the additive injection valve.

請求項２の内燃機関の排気浄化装置では、請求項１において、側面に該添加剤噴射弁の軸直方向に垂直をなし且つ平行な２つの挟持面を有しており、前記固定部材は、前記一対の挟持片の各一側端部が前記挟持面と当接して挟持することを特徴としている。 In the exhaust purification apparatus 請 Motomeko 2 of the internal combustion engine, according to claim 1, has a and two parallel holding surface forms a perpendicular to the direction perpendicular to the axis of the additive injection valve side, the fixing member The one side end portions of the pair of sandwiching pieces are in contact with the sandwiching surface to sandwich.

請求項３の内燃機関の排気浄化装置では、請求項１または２において、前記付勢手段は、端部が前記一対の挟持片のそれぞれの一側端部に接続されたＣ字状の弾性部材であることを特徴としている。 In the exhaust purification system of an internal combustion engine according to claim 3, in claim 1 or 2, wherein the biasing means, each one end connected to the C-shaped elastic member end portion the pair of clamping pieces It is characterized by being.

上記手段を用いる本発明の請求項１の内燃機関の排気浄化装置によれば、排気管内に設けられた触媒に添加剤を供給する添加剤噴射弁を、付勢手段により付勢されて挟持する固定部材により軸周りの所定の向きで固定する。
つまり、固定部材は付勢手段により付勢されて添加剤噴射弁を挟持することで、当該添加剤噴射弁と確実に当接して、当該添加剤噴射弁を軸周りの所定の向きで確実に固定することができる。 According to the exhaust emission control device for an internal combustion engine of the first aspect of the present invention using the above means, the additive injection valve for supplying the additive to the catalyst provided in the exhaust pipe is urged by the urging means and is sandwiched. It is fixed in a predetermined direction around the axis by a fixing member.
In other words, the fixing member is urged by the urging means to pinch the additive injection valve, so that the fixing member comes into contact with the additive injection valve reliably, and the additive injection valve is reliably in a predetermined direction around the axis. Can be fixed.

これにより、添加剤噴射弁から噴射される添加剤噴射の向きを、常に設計通りの適正な方向に固定することができる。したがって、当該添加剤は確実に触媒に供給され、排気浄化性能を確保することができる。
このことから、触媒へ添加剤を供給する添加剤噴射弁において、位置決めにおける精度を高くする必要なく容易な作業で適正な位置に組み付けることができ、排気浄化装置の機能性を十分に確保することができる。 Thereby, the direction of the additive injection injected from the additive injection valve can always be fixed in an appropriate direction as designed. Therefore, the additive is reliably supplied to the catalyst, and the exhaust purification performance can be ensured.
Therefore, in the additive injection valve that supplies the additive to the catalyst, it can be assembled at an appropriate position by an easy operation without the need for high accuracy in positioning, and the functionality of the exhaust emission control device is sufficiently ensured. Can do.

また、固定部材について、一側端部で添加剤噴射弁を挟持し、該一側端部と離間した位置で互いに回動自在に枢支された一対の挟持片から構成することしている。
このように、固定部材は枢支部分を支点に一側端部で添加剤噴射弁を挟持する構成であることで、当該一側端部を互いに離間させることができ、取り付け及び取り外しの作業を容易に行うことができ、作業性を向上させることができる。 Further , the fixing member is composed of a pair of clamping pieces that are held at one side end portion and pivotally supported at positions separated from the one side end portion.
In this way, the fixing member is configured to sandwich the additive injection valve at one side end portion with the pivot portion as a fulcrum, so that the one side end portions can be separated from each other, and attachment and removal operations can be performed. It can be performed easily and workability can be improved.

請求項２の内燃機関の排気浄化装置によれば、添加剤噴射弁の側面に軸直方向に垂直且つ平行な２つの挟持面を有しており、固定部材が、一対の挟持片の一側端部の側面で挟持面と当接して挟持することとしている。
このように、添加剤噴射弁の挟持面が固定部材の一側端部により挟持されることで、添加剤噴射弁の軸周りにおける向きにずれがある場合でも、一側端部に作用する付勢力により当該挟持面と一側端部とが全面で当接するよう当該軸周りにおける向きが修正される。 According to the exhaust gas purification apparatus for an internal combustion engine according to claim 2 , the side surface of the additive injection valve has two clamping surfaces perpendicular and parallel to the axial direction, and the fixing member is one side of the pair of clamping pieces. The side surface of the end portion is held in contact with the clamping surface.
In this way, when the sandwiching surface of the additive injection valve is sandwiched by the one side end of the fixing member, even if there is a deviation in the direction around the axis of the additive injection valve, it acts on the one side end. The direction around the axis is corrected so that the clamping surface and the one side end abut against each other by the force.

したがって、添加剤噴射弁の軸周りにおいて設計通りの所定の向きで確実に固定することができる。
請求項３の内燃機関の排気浄化装置によれば、付勢手段を、端部が一対の挟持片のそれぞれの一側端部に接続されたＣ字状の弾性部材としている。
これにより、簡易な構成で一対の挟持片の一側端部を付勢することができる。 Therefore, it can be reliably fixed in a predetermined direction as designed around the axis of the additive injection valve.
According to the exhaust gas purification apparatus for an internal combustion engine of the third aspect, the urging means is a C-shaped elastic member whose end is connected to one end of each of the pair of sandwiching pieces.
Thereby, one side edge part of a pair of clamping piece can be urged | biased with a simple structure.

以下、本発明の実施の形態を図面に基づき説明する。
図１乃至８を参照すると、図１には本発明の実施形態に係る内燃機関の排気浄化装置の概略構成図、図２には図１の要部拡大斜視図、図３には図１の要部拡大断面図、図４には図３のＡ−Ａ線に沿う断面図、図５には固定部材の斜視図、図６には図３のＢ−Ｂ線に沿う断面図、図７には燃料添加インジェクタ組付状態時の上面視図、図８には固定部材取付前の上面視図がそれぞれ示されており、以下これらの図に基づき説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Referring to FIGS. 1 to 8, FIG. 1 is a schematic configuration diagram of an exhaust emission control device for an internal combustion engine according to an embodiment of the present invention, FIG. 2 is an enlarged perspective view of a main part of FIG. 1, and FIG. FIG. 4 is a sectional view taken along line AA in FIG. 3, FIG. 5 is a perspective view of a fixing member, FIG. 6 is a sectional view taken along line BB in FIG. FIG. 8 shows a top view when the fuel addition injector is assembled, and FIG. 8 shows a top view before the fixing member is attached. The following description is based on these drawings.

図１に示すエンジン（内燃機関）１は、軽油を燃料として駆動するディーゼルエンジンである。
当該エンジン１の側面には排気マニホールド２の一端が接続されており、当該排気マニホールド２の他端には過給機４が接続されている。
当該過給機４は、ターボチャージャであり、図示しない吸気通路にコンプレッサが設けられ、排気通路にはタービンが設けられている。 An engine (internal combustion engine) 1 shown in FIG. 1 is a diesel engine that uses light oil as fuel.
One end of an exhaust manifold 2 is connected to the side surface of the engine 1, and a supercharger 4 is connected to the other end of the exhaust manifold 2.
The turbocharger 4 is a turbocharger, and a compressor is provided in an intake passage (not shown), and a turbine is provided in an exhaust passage.

また、当該過給機４の排気下流側には、排気管１０が接続されている。
当該排気管１０内には排気上流側から順に、酸化触媒１２、ＮＯｘトラップ触媒１４、パティキュレートフィルタ（以下、ＤＰＦという）１６が設けられている。
詳しくは、排気管１０は過給機４との接続部分からエンジン１の横方向に延び、途中下方に屈曲された屈曲部１０ａが形成されている。 An exhaust pipe 10 is connected to the exhaust downstream side of the supercharger 4.
In the exhaust pipe 10, an oxidation catalyst 12, a NOx trap catalyst 14, and a particulate filter (hereinafter referred to as DPF) 16 are provided in this order from the exhaust upstream side.
Specifically, the exhaust pipe 10 extends from the connecting portion with the supercharger 4 in the lateral direction of the engine 1, and is formed with a bent portion 10 a bent downward in the middle.

そして、当該屈曲部１０ａの排気下流側には酸化触媒１２が設けられている。当該酸化触媒１２は通路を形成する多孔質の壁にプラチナ（Ｐｔ）、パラジウム（Ｐｄ）、ロジウム（Ｒｈ）等の触媒貴金属を担持して形成されており、排気中のＣＯ、ＨＣ等をＣＯ２及びＨ２Ｏに変換させる酸化反応を生ずる機能を有している。
ＮＯｘトラップ触媒１４及びＤＰＦ１６は、横方向に延びた排気下流側部分の排気管１０内に設けられている。ＮＯｘトラップ触媒１４は、排気中のＮＯｘを吸蔵し、Ｈ２やＨＣやＣＯ等の添加剤が供給されＮＯｘトラップ触媒上で還元雰囲気が形成されたときに吸蔵したＮＯｘを放出還元する所謂ＮＯｘパージが行われるものである。ＤＰＦ１６は、排気中のＰＭを捕集し、昇温されることで捕集したＰＭが焼却除去される所謂強制再生が行われるものである。 An oxidation catalyst 12 is provided on the exhaust downstream side of the bent portion 10a. The oxidation catalyst 12 is formed by supporting a catalyst noble metal such as platinum (Pt), palladium (Pd), or rhodium (Rh) on a porous wall forming a passage. 2 and a function of causing an oxidation reaction for conversion to H 2 O.
The NOx trap catalyst 14 and the DPF 16 are provided in the exhaust pipe 10 at the exhaust downstream side portion extending in the lateral direction. The NOx trap catalyst 14 stores NOx in the exhaust gas, so-called NOx purge that releases and reduces the stored NOx when an additive such as H2, HC, CO, etc. is supplied and a reducing atmosphere is formed on the NOx trap catalyst. Is to be done. The DPF 16 collects PM in the exhaust gas, and performs so-called forced regeneration in which the collected PM is incinerated and removed by raising the temperature.

また、排気管１０の屈曲部１０ａには、上記酸化触媒１２及びＮＯｘ触媒１４へ供給する添加剤としての燃料を噴射する燃料添加インジェクタ２０（添加剤噴射弁）が支持部材２２を介して支持されている。
詳しくは図２乃至４に示すように、支持部材２２は、下端が排気管１０の屈曲部１０ａの上面部分に当接し、当該下端から排気管外側方向、即ち上方向に向かって延びている。 A fuel addition injector 20 (additive injection valve) that injects fuel as an additive to be supplied to the oxidation catalyst 12 and the NOx catalyst 14 is supported by a bent portion 10 a of the exhaust pipe 10 via a support member 22. ing.
Specifically, as shown in FIGS. 2 to 4, the support member 22 has a lower end in contact with an upper surface portion of the bent portion 10 a of the exhaust pipe 10, and extends from the lower end toward the outside of the exhaust pipe, that is, upward.

当該支持部材２２の下部内部には、半球状をなす噴射空間２４が形成されており、当該噴射空間２４の下端は排気管１０の屈曲部１０ａに穿設された開口部１０ｂを通じて排気管１０内と連通されている。
また、当該支持部材２２には、噴射空間２４の壁面上端から当該支持部材２２の上面に貫通した嵌合孔２６が穿設されている。 A hemispherical injection space 24 is formed in the lower part of the support member 22, and the lower end of the injection space 24 is formed in the exhaust pipe 10 through an opening 10 b formed in the bent portion 10 a of the exhaust pipe 10. Communicated with.
Further, the support member 22 is provided with a fitting hole 26 penetrating from the upper end of the wall surface of the ejection space 24 to the upper surface of the support member 22.

当該嵌合孔２６は燃料添加インジェクタ２０の下側半分の外形に合わせた形状をなしており、当該嵌合孔２６に燃料添加インジェクタ２０が嵌合されている。
燃料添加インジェクタ２０は、軸方向一側を下方として設けられており、円筒状の本体部３０、当該本体部３０の下端から下方に突出したノズル部３２、及び当該本体部３０の軸方向中央部に形成された鍔部３４から構成されている。 The fitting hole 26 has a shape that matches the outer shape of the lower half of the fuel addition injector 20, and the fuel addition injector 20 is fitted into the fitting hole 26.
The fuel addition injector 20 is provided with one side in the axial direction as a lower side, a cylindrical main body part 30, a nozzle part 32 protruding downward from the lower end of the main body part 30, and an axially central part of the main body part 30. It is comprised from the collar part 34 formed in this.

詳しくは、ノズル部３２の先端は支持部材２２の噴射空間２４に臨んでおり、当該ノズル部３２先端からは酸化触媒１２の排気上流側面に向かって二又に分かれた燃料噴射３６ａ、３６ｂが噴射される。
また、当該燃料添加インジェクタ２０の鍔部３４は、本体部３０に一体に外嵌された環状をなしている。そして、当該鍔部３４の軸方向上側であって、上面視において一側及び他側の両部分には、それぞれ本体部近傍に位置し軸直方向に垂直な弦から外側に切り欠かれた切欠部３４ａ、３４ｂが形成されている。なお、当該切欠部３４ａ、３４ｂの底面は、燃料添加インジェクタ２０が支持部材２２の嵌合部２６に嵌合されているときに、当該支持部材２２の上面と連続するよう形成されている。また、当該切欠部３４ａ、３４ｂの壁面（挟持面）は、上記二又の燃料噴射３６ａ、３６ｂの方向と対応して形成されている。 Specifically, the tip of the nozzle portion 32 faces the injection space 24 of the support member 22, and fuel injections 36 a and 36 b that are divided in two toward the exhaust upstream side of the oxidation catalyst 12 are injected from the tip of the nozzle portion 32. Is done.
Further, the flange 34 of the fuel addition injector 20 has an annular shape that is integrally fitted to the main body 30. In addition, in the upper side in the axial direction of the flange portion 34, both the one side portion and the other side portion in the top view are notches that are located near the main body portion and cut out outward from the strings perpendicular to the axial direction. Portions 34a and 34b are formed. The bottom surfaces of the notches 34 a and 34 b are formed so as to be continuous with the top surface of the support member 22 when the fuel addition injector 20 is fitted to the fitting portion 26 of the support member 22. Further, the wall surfaces (clamping surfaces) of the notches 34a and 34b are formed corresponding to the directions of the forked fuel injections 36a and 36b.

そして、当該燃料添加インジェクタ２０から噴射される燃料噴射３６ａ、３６ｂは、噴射通路２６内を通り排気管１０内へと流入し、上記酸化触媒１２に供給される。燃料が添加された酸化触媒１２では酸化反応が生じ、当該酸化反応の熱により排気が昇温される。さらに排気下流側にあるＮＯｘトラップ触媒１４に昇温された排気と酸化触媒１２で酸化しきらなかった未燃成分（Ｈ２やＨＣやＣＯ）が流入しＮＯｘトラップ触媒上で還元雰囲気が形成されることで、ＮＯｘパージが行われる。また、ＤＰＦ１４においては、酸化触媒１２により昇温された排気が流入することでＰＭが焼却除去されて強制再生が行われる。   The fuel injections 36 a and 36 b injected from the fuel addition injector 20 flow into the exhaust pipe 10 through the injection passage 26 and are supplied to the oxidation catalyst 12. An oxidation reaction occurs in the oxidation catalyst 12 to which fuel is added, and the temperature of the exhaust is raised by the heat of the oxidation reaction. Further, the exhaust gas heated to the NOx trap catalyst 14 on the downstream side of the exhaust gas and unburned components (H2, HC and CO) that could not be oxidized by the oxidation catalyst 12 flow into the NOx trap catalyst to form a reducing atmosphere on the NOx trap catalyst. Thus, the NOx purge is performed. Further, in the DPF 14, the exhaust gas whose temperature has been raised by the oxidation catalyst 12 flows in, whereby PM is incinerated and removed, and forced regeneration is performed.

以上のような構成をなす燃料添加インジェクタ２０は、支持部材２２に固定部材４０によって固定されている。
固定部材４０は、図３乃至８に示すように、一対の挟持片４２、４４及び弾性部材４６（付勢手段）から構成されている。
詳しくは、一対の挟持片４２、４４はそれぞれ一方向に長い形状をなし、略平行に対向している。そして、それぞれの挟持片４２、４４の長手方向略中央位置において、互いに接近する方向（以下、接近方向という）に膨出した枢支部４８ａ、４８ｂ、５０において枢支されている。 The fuel addition injector 20 configured as described above is fixed to the support member 22 by a fixing member 40.
As shown in FIGS. 3 to 8, the fixing member 40 includes a pair of sandwiching pieces 42 and 44 and an elastic member 46 (biasing means).
Specifically, each of the pair of sandwiching pieces 42 and 44 has a shape that is long in one direction, and is opposed substantially in parallel. And it is pivotally supported by pivotal support parts 48a, 48b, 50 bulged in directions approaching each other (hereinafter referred to as the approaching direction) at approximately the center position in the longitudinal direction of each sandwiching piece 42, 44.

当該枢支部４８ａ、４８ｂ、５０は、一方の挟持片４２においては上下二片の枢支部４８ａ、４８ｂが形成され、他方の挟持片４４においては上下方向中央部に一片の枢支部５０が形成されており、当該一方の挟持片４２の枢支部４８ａ、４８ｂの間に、他方の挟持片４４の枢支部５０が位置している。
また、当該枢支部４８ａ、４８ｂ、５０は、それぞれ端部分が上面視半円形状をなしており、一対の挟持片４２、４４は当該枢支部４８ａ、４８ｂ、５０の端部形状に沿うように相互に回動可能である。 The pivot parts 48a, 48b, 50 are formed with two upper and lower pivot parts 48a, 48b in one clamping piece 42, and one pivotal part 50 is formed in the vertical center part of the other clamping piece 44. The pivoting portion 50 of the other sandwiching piece 44 is located between the pivoting portions 48a and 48b of the one sandwiching piece 42.
Further, the pivot portions 48a, 48b, 50 each have an end portion in a semicircular shape when viewed from above, and the pair of sandwiching pieces 42, 44 follow the end shape of the pivot portions 48a, 48b, 50. They can be rotated with respect to each other.

また、当該枢支部４８ａ、４８ｂ、５０の上面視中央位置には、上下方向に貫通する貫通孔５２ａ、５２ｂ、５４がそれぞれ穿設されている。さらに一方の挟持片４２における枢支部４８ａ上面には、当該貫通孔５２ａ周縁において僅かに球面状に凹んだ凹部５６が形成されている。
当該一対の挟持片４２、４４において、枢支部４８ａ、４８ｂ、５０より一側は僅かに下方に傾斜して延びている。そして、一側端部５８、６０においては、下面が側面視曲面状をなしており、支持部材２０上面及び燃料添加インジェクタ２０の切欠部３４ａ、３４ｂの底面と当接されている。 Further, through-holes 52a, 52b, and 54 penetrating in the vertical direction are formed at the center positions of the pivotal support portions 48a, 48b, and 50 when viewed from above. Further, on the upper surface of the pivotal support portion 48a of one sandwiching piece 42, a concave portion 56 is formed that is slightly spherically recessed at the periphery of the through hole 52a.
In the pair of sandwiching pieces 42 and 44, one side from the pivotal support portions 48a, 48b, and 50 extends slightly inclined downward. The lower surfaces of the one side end portions 58 and 60 are curved in a side view, and are in contact with the upper surface of the support member 20 and the bottom surfaces of the cutout portions 34a and 34b of the fuel addition injector 20.

また、一対の挟持片４２、４４の枢支部４８ａ、４８ｂ、５０より他側には、下方に僅かに突出した突出部６２、６４が形成されている。そして、他側端部６６、６８は上面視においてそれぞれ接近側に幅が狭くなっており、側面視においては挟持片４２、４４の長手方向に僅かに長い長孔７０、７２が穿設されている。
一方、弾性部材４６は、Ｃ字状のリングばねであり、一対の挟持片４２、４４の他側端部６６、６８の長孔７０、７２を貫通し、一端が一方の挟持片４２の一側端部５８に接続され、他端が他方の挟持片４４の一側端部６０に接続されている。そして、当該弾性部材４６は、一対の挟持片４２、４４の一側端部５８、６０を接近方向に付勢するものである。 Further, projecting portions 62 and 64 slightly projecting downward are formed on the other side of the pair of sandwiching pieces 42 and 44 from the pivotal support portions 48a, 48b, and 50. The other end portions 66 and 68 are narrower on the approaching side in the top view, and have slightly long holes 70 and 72 in the longitudinal direction of the sandwiching pieces 42 and 44 in the side view. Yes.
On the other hand, the elastic member 46 is a C-shaped ring spring, passes through the long holes 70 and 72 of the other end portions 66 and 68 of the pair of sandwiching pieces 42 and 44, and one end is one of the sandwiching pieces 42. It is connected to the side end portion 58, and the other end is connected to one side end portion 60 of the other holding piece 44. The elastic member 46 biases one end portions 58 and 60 of the pair of sandwiching pieces 42 and 44 in the approaching direction.

このように構成されている固定部材４０は、枢支部４８ａ、４８ｂ、５０の貫通孔５２ａ、５２ｂ、５４にボルト８０が挿入されている。そして、当該ボルト８０は、先端側が、支持部材２２において側方に膨出しているとともに上方に僅かに***した膨出部２０ａの螺合孔８２に螺合することで、固定部材４０を締結している。なお、当該ボルト８０の頭部と一方の挟持片４０の凹部５６との間には、当該凹部５６に合わせて下面が球面状をなすワッシャ８４が介装されている。   In the fixing member 40 configured as described above, the bolt 80 is inserted into the through holes 52a, 52b, and 54 of the pivot portions 48a, 48b, and 50. Then, the bolt 80 is screwed into the screw hole 82 of the bulging portion 20a that bulges laterally in the support member 22 and slightly rises upward, thereby fastening the fixing member 40. ing. A washer 84 having a spherical lower surface is interposed between the head of the bolt 80 and the recess 56 of the one clamping piece 40 in accordance with the recess 56.

そして、固定部材４０の一側端部５８、６０では、接近方向側面が燃料添加インジェクタ２０の切欠部３４ａ、３４ｂの側面と当接しているともに、下面が当該切欠部３４ａ、３４ｂの底面及び支持部材２２の上面と当接しており、燃料添加インジェクタ２０を支持部材２２に固定している。また、固定部材４０の突出部６２、６４は、支持部材２２の膨出部２０ａの上面に形成されている係合部８６ａ、８６ｂに係合されている。   At the side end portions 58 and 60 of the fixing member 40, the approach side surfaces are in contact with the side surfaces of the cutout portions 34a and 34b of the fuel addition injector 20, and the lower surface is the bottom surface and support of the cutout portions 34a and 34b. The fuel addition injector 20 is fixed to the support member 22 in contact with the upper surface of the member 22. Further, the protruding portions 62 and 64 of the fixing member 40 are engaged with engaging portions 86 a and 86 b formed on the upper surface of the bulging portion 20 a of the support member 22.

以下このように構成された本発明の実施形態に係る内燃機関の排気浄化装置における作用について説明する。
図８に示すように、燃料添加インジェクタ２０の組み付けの際には、まず燃料添加インジェクタ２０を支持部材２２の嵌合孔２６に嵌合する。このとき、燃料添加インジェクタ２０の軸周りにおける向きは、切欠部３４ａ、３４ｂの壁部の方向が支持部材２２に対して膨出部２２ａが形成されている方向と同方向となるよう合わせる。 The operation of the exhaust gas purification apparatus for an internal combustion engine according to the embodiment of the present invention configured as described above will be described below.
As shown in FIG. 8, when the fuel addition injector 20 is assembled, the fuel addition injector 20 is first fitted into the fitting hole 26 of the support member 22. At this time, the orientation of the fuel addition injector 20 around the axis is adjusted so that the direction of the wall portions of the notches 34 a and 34 b is the same as the direction in which the bulging portion 22 a is formed with respect to the support member 22.

また、固定部材４０は、図示しない治具または手動（以下治具等という）により一対の挟持片４２、４４の一側端部５８、６０を弾性部材４６の付勢力に抗して互いに離間させる。そして、当該固定部材４０を、一側端部５８、６０の間に燃料添加インジェクタ２０が位置するよう、且つ貫通孔５２ａ、５２ｂ、５４が膨出部２２ａの螺合孔８４の位置に合うよう移動させる。   The fixing member 40 separates the one end portions 58 and 60 of the pair of sandwiching pieces 42 and 44 from each other against the biasing force of the elastic member 46 by a jig (not shown) or manually (hereinafter referred to as a jig or the like). . Then, the fixing member 40 is arranged so that the fuel addition injector 20 is positioned between the one side end portions 58 and 60, and the through holes 52a, 52b, and 54 are aligned with the positions of the screw holes 84 of the bulging portion 22a. Move.

さらに、当該固定部材４０の突出部６２、６４が膨出部２２ａの係合部８６ａ、８６ｂに係合するよう固定部材４０の下面を膨出部２２ａの上面に当接させ、一側端部５８、６０を燃料添加インジェクタ２０の切欠部３４ａ、３４ｂに合わせた後、当該一側端部５８、６０離間させている治具等を解除する。治具等が解除された一側端部５８、６０は弾性部材４６の付勢力により接近方向に移動し、燃料添加インジェクタ２０の切欠部３４ａ、３４ｂ壁面と当接し当該燃料添加インジェクタ２０を挟持する。   Further, the lower surface of the fixing member 40 is brought into contact with the upper surface of the bulging portion 22a so that the protrusions 62 and 64 of the fixing member 40 engage with the engaging portions 86a and 86b of the bulging portion 22a. After aligning 58 and 60 with the cutout portions 34a and 34b of the fuel addition injector 20, the jigs and the like separated from the one side end portions 58 and 60 are released. The one end portions 58 and 60 with the jigs released are moved in the approaching direction by the urging force of the elastic member 46 and come into contact with the wall surfaces of the cutout portions 34a and 34b of the fuel addition injector 20 to sandwich the fuel addition injector 20 therebetween. .

このとき、燃料添加インジェクタ２０が固定部材４０の一側端部５８、６０により挟持されることで、弾性部材４６による付勢力により当該一側端部５８、６０と切欠部３４ａ、３４ｂの壁面とが全面で当接するように燃料添加インジェクタ２０の軸周りにおける向きが修正される。
また、一側端部５８、６０の下面は、支持部材２２の上面及び切欠部３４ａ、３４ｂの底面と当接する。そして、当該一側端部５８、６０の下面は側面視曲面状をなしていることから支持部材２２の上面及び切欠部３４ａ、３４ｂの底面と片当たりすることなく、確実に下方に押圧するよう当接される。 At this time, the fuel addition injector 20 is sandwiched between the one end portions 58 and 60 of the fixing member 40, so that the one end portions 58 and 60 and the wall surfaces of the notches 34 a and 34 b are urged by the urging force of the elastic member 46. The direction of the fuel addition injector 20 around the axis is corrected so that the fuel is in contact with the entire surface.
Further, the lower surfaces of the one side end portions 58 and 60 are in contact with the upper surface of the support member 22 and the bottom surfaces of the notches 34a and 34b. And since the lower surface of the said one side edge part 58 and 60 has comprised the side view curved surface shape, it is surely pressed below, without touching the upper surface of the supporting member 22, and the bottom face of notch part 34a, 34b. Abutted.

さらに、固定部材４０の貫通孔５２ａ、５２ｂ、５４にボルト８０を挿入し、当該ボルト８０が締結されることで、燃料添加インジェクタ２０は支持部材２２に固定される。
一方、固定部材４０の取り外し時においては、ボルト８０を外し、固定部材４０の一側端部５８、６０を治具等で離間させて固定部材４０を離脱させる。
以上のように、固定部材４０は一対の挟持片４２、４４とリングばねの弾性部材４６からなる簡単な構成でありつつ、当該弾性部材４６による付勢力により燃料添加インジェクタ２０を挟持し、当該燃料添加インジェクタ２０を確実に固定させることができる。 Further, the fuel addition injector 20 is fixed to the support member 22 by inserting the bolt 80 into the through holes 52a, 52b, 54 of the fixing member 40 and fastening the bolt 80.
On the other hand, when the fixing member 40 is removed, the bolt 80 is removed, and the one side end portions 58 and 60 of the fixing member 40 are separated by a jig or the like to release the fixing member 40.
As described above, the fixing member 40 has a simple configuration including the pair of sandwiching pieces 42 and 44 and the elastic member 46 of the ring spring, and sandwiches the fuel addition injector 20 by the urging force of the elastic member 46, so that the fuel The addition injector 20 can be reliably fixed.

燃料添加インジェクタ２０の切欠部３４ａ、３４ｂの壁面を固定部材４０の一側端部５８、６０により挟持することで、弾性部材４６による付勢力により当該一側端部５８、６０と切欠部３４ａ、３４ｂの壁面とが全面で当接するよう燃料添加インジェクタ２０の向きが修正され、燃料添加インジェクタ２０の軸周りにおいて設計通りの所定の向きで確実に固定することができる。   By sandwiching the wall surfaces of the notches 34a and 34b of the fuel addition injector 20 with the one side ends 58 and 60 of the fixing member 40, the one side ends 58 and 60 and the notches 34a and The direction of the fuel addition injector 20 is corrected so that the wall surface of 34b abuts on the entire surface, and the fuel addition injector 20 can be reliably fixed around the axis of the fuel addition injector 20 in a predetermined direction as designed.

これにより、二又をなすような指向性を有した燃料噴射３６ａ、３６ｂであっても、常に設計通りの適正な方向に噴射させることができる。つまり、当該燃料噴射３６ａ、３６ｂは確実に酸化触媒及びＮＯｘ触媒に供給され、排気浄化性能を確保することができる。
また、固定部材４０は、燃料添加インジェクタ２０を挟持する一側端部５８、６０を離間させることができることで、取り付け及び取り外しの作業を容易に行うことができ、作業性を向上させることができる。 Thereby, even if it is fuel injection 36a, 36b with the directivity which makes a bifurcation, it can always inject in the appropriate direction as a design. That is, the fuel injections 36a and 36b are reliably supplied to the oxidation catalyst and the NOx catalyst, and the exhaust purification performance can be ensured.
In addition, since the fixing member 40 can separate the one side end portions 58 and 60 that sandwich the fuel addition injector 20, attachment and removal operations can be easily performed, and workability can be improved. .

以上のことから、本発明に係る内燃機関の排気浄化装置では、酸化触媒１２及びＮＯｘ触媒１４に燃料（ＨＣ）を供給する燃料添加インジェクタ２０において、位置決めにおける精度を高くする必要なく、容易な作業で適正な位置に組み付けることができ、排気浄化装置の機能性を十分に確保することができる。
以上で本発明に係る内燃機関の排気浄化装置の実施形態についての説明を終えるが、実施形態は上記実施形態に限られるものではない。 As described above, in the exhaust gas purification apparatus for an internal combustion engine according to the present invention, the fuel addition injector 20 that supplies fuel (HC) to the oxidation catalyst 12 and the NOx catalyst 14 does not need to have high positioning accuracy and can be easily operated. Can be assembled at an appropriate position, and the functionality of the exhaust emission control device can be sufficiently ensured.
Although the description of the embodiment of the exhaust gas purification apparatus for an internal combustion engine according to the present invention is finished above, the embodiment is not limited to the above embodiment.

上記実施形態では、燃料添加インジェクタ２２は、排気管１０における屈曲部１０ａ、に設けられているが、添加剤噴射弁は当該部分に設けられるものに限られず、添加剤が触媒に供給可能なよう排気上流側に設けられる構成であればよい。
また、上記実施形態では、排気管１０内に酸化触媒１２、ＮＯｘトラップ触媒１４、ＤＰＦ１６を備えた排気浄化装置であるが、燃料を添加する触媒を備えた排気浄化装置であればよく、例えば、酸化触媒の排気下流側にＮＯｘトラップ触媒及びＤＰＦのいずれか一方のみを備えた構成であっても構わない。 In the above embodiment, the fuel addition injector 22 is provided in the bent portion 10a of the exhaust pipe 10, but the additive injection valve is not limited to that provided in the portion, and the additive can be supplied to the catalyst. Any configuration provided on the exhaust upstream side may be used.
In the above embodiment, the exhaust gas purification device includes the oxidation catalyst 12, the NOx trap catalyst 14, and the DPF 16 in the exhaust pipe 10, but any exhaust gas purification device including a catalyst for adding fuel may be used. There may be a configuration in which only one of the NOx trap catalyst and the DPF is provided on the exhaust gas downstream side of the oxidation catalyst.

また、上記実施形態では、燃料添加インジェクタ２０から二又の燃料噴射３６ａ、３６ｂが噴射される構成であるが、燃料噴射の形状等はこれに限定されるものではない。
さらに、上記実施形態では添加剤として燃料で説明したが、触媒に供給するものであれば何でもよく、例えば還元剤としてのガソリン、エタノール、尿素、アンモニアなどでもよい。また、還元剤以外の物質でもよく、例えば触媒冷却のための空気，窒素，二酸化炭素などや，パティキュレートフィルタに捕集した煤の燃焼除去を促進させるための空気やセリアなどでもよい。 Moreover, in the said embodiment, although the forked fuel injection 36a, 36b is injected from the fuel addition injector 20, the shape of fuel injection etc. are not limited to this.
Furthermore, in the above-described embodiment, the fuel has been described as the additive. However, any material may be used as long as it is supplied to the catalyst. For example, gasoline, ethanol, urea, ammonia, or the like as the reducing agent may be used. Further, a substance other than the reducing agent may be used. For example, air for cooling the catalyst, nitrogen, carbon dioxide, etc., air or ceria for promoting combustion removal of soot collected in the particulate filter, and the like may be used.

また、上記実施形態では、一対の挟持片は一方向に長い構成をなしているが、当該挟持片はこのような形状に限られるものではなく、例えば枢支部から一側端部に向け円弧状に湾曲した構成であっても構わない。
また、上記実施形態では、燃料添加インジェクタにおける挟持面である切欠部の壁面及び当該挟持面を挟持する一対の挟持片の一側端部の側面はそれぞれ平面をなしているが、このような形状に限られるものではなく、燃料添加インジェクタの挟持面及び一対の挟持片の一側端部の側面が、燃料添加インジェクタの位置決め可能に、それぞれ対応する形状をなしていればよい。
また、上記実施形態では、付勢手段としてＣ字状のリングばねを使用しているが、付勢手段はこれに限られるものではなく、例えば枢支部の一側または他側において、一対の枢支部に間を連結するコイルばねを設けても構わない。つまり、枢支部の一側に当該コイルばねを設けた場合には当該コイルばねの引っ張りにより、一方枢支部の他側にコイルばねを設けた場合にはばねの弾性により一側端部を付勢するものである。 Further, in the above embodiment, the pair of sandwiching pieces has a configuration that is long in one direction, but the sandwiching piece is not limited to such a shape, for example, an arc shape from the pivotal portion toward one side end portion. A curved configuration may be used.
Further, in the above embodiment, the wall surface of the notch portion that is the clamping surface in the fuel addition injector and the side surfaces of the one side end portions of the pair of clamping pieces that clamp the clamping surface are each flat, but such a shape However, the present invention is not limited to this, and the sandwiching surface of the fuel addition injector and the side surfaces of the one end portions of the pair of sandwiching pieces only have to have corresponding shapes so that the fuel addition injector can be positioned.
In the above embodiment, a C-shaped ring spring is used as the urging means, but the urging means is not limited to this. For example, on one side or the other side of the pivot portion, a pair of pivots is provided. You may provide the coil spring which connects between in a support part. That is, when the coil spring is provided on one side of the pivoting portion, the one end is biased by the tension of the coil spring, and when the coil spring is provided on the other side of the pivoting portion, the one end is biased by the elasticity of the spring. To do.

本発明の実施形態に係る内燃機関の排気浄化装置の概略構成図である。1 is a schematic configuration diagram of an exhaust emission control device for an internal combustion engine according to an embodiment of the present invention. 本発明の実施形態に係る内燃機関の排気浄化装置の要部拡大斜視図である。It is a principal part expansion perspective view of the exhaust gas purification apparatus of the internal combustion engine which concerns on embodiment of this invention. 図１の要部拡大断面図である。It is a principal part expanded sectional view of FIG. 図３のＡ−Ａ線に沿う断面図である。It is sectional drawing which follows the AA line of FIG. 固定部材の斜視図である。It is a perspective view of a fixing member. 図３のＢ−Ｂ線に沿う断面図である。It is sectional drawing which follows the BB line of FIG. 燃料添加インジェクタ組付状態時の上面視図である。It is a top view at the time of a fuel addition injector assembly | attachment state. 固定部材取付前の上面視図である。It is a top view before fixing member attachment.

符号の説明Explanation of symbols

１ エンジン（内燃機関）
１０ 排気管
１０ａ 屈曲部
１２ 酸化触媒
２０ 燃料添加インジェクタ（添加剤噴射弁）
２２ 支持部材
３４ 鍔部
３４ａ、３４ｂ 切欠部
４０ 固定部材
４２、４４ 挟持片
４６ 弾性部材（付勢手段）
５８、６０一側端部
８０ ボルト 1 engine (internal combustion engine)
DESCRIPTION OF SYMBOLS 10 Exhaust pipe 10a Bending part 12 Oxidation catalyst 20 Fuel addition injector (additive injection valve)
22 support member 34 collar 34a, 34b notch 40 fixing member 42, 44 clamping piece 46 elastic member (biasing means)
58, 60 One end 80 bolt

Claims (3)

内燃機関の排気管内に設けられた触媒と、
前記排気管に設けられ前記触媒に供給する添加剤を噴射する添加剤噴射弁と、
一側端部が付勢手段により付勢されて前記添加剤噴射弁を挟持し、該一側端部と離間した位置で互いに回動自在に枢支された一対の挟持片から構成され、該添加剤噴射弁の軸周りにおける所定の向きで該添加剤噴射弁を固定する固定部材と、
を備えたことを特徴とする内燃機関の排気浄化装置。 A catalyst provided in the exhaust pipe of the internal combustion engine;
An additive injection valve for injecting an additive provided in the exhaust pipe and supplied to the catalyst;
One side end portion is biased by a biasing means to sandwich the additive injection valve , and is composed of a pair of sandwiching pieces pivotably supported at positions spaced from the one side end portion, A fixing member for fixing the additive injection valve in a predetermined direction around the axis of the additive injection valve;
An exhaust emission control device for an internal combustion engine, comprising: 前記添加剤噴射弁は、側面に該添加剤噴射弁の軸直方向に垂直をなし且つ平行な２つの挟持面を有しており、
前記固定部材は、前記一対の挟持片の各一側端部が前記挟持面と当接して挟持することを特徴とする請求項１記載の内燃機関の排気浄化装置。 The additive injection valve has two clamping surfaces that are perpendicular to and parallel to the axial direction of the additive injection valve on the side surface,
The fixing member, an exhaust purifying apparatus for an internal combustion engine according to claim 1, wherein each one end of said pair of holding pieces, characterized in that clamping in contact with the sandwiching face. 前記付勢手段は、端部が前記一対の挟持片のそれぞれの一側端部に接続されたＣ字状の弾性部材であることを特徴とする請求項１または２記載の内燃機関の排気浄化装置。 The exhaust gas purification for an internal combustion engine according to claim 1 or 2 , wherein the biasing means is a C-shaped elastic member having an end portion connected to one end portion of each of the pair of sandwiching pieces. apparatus.
JP2008047168A 2008-02-28 2008-02-28 Exhaust gas purification device for internal combustion engine Expired - Fee Related JP4936008B2 (en)

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