JP5418771B2 - Exhaust gas purification device for internal combustion engine - Google Patents

Exhaust gas purification device for internal combustion engine Download PDF

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JP5418771B2
JP5418771B2 JP2009190033A JP2009190033A JP5418771B2 JP 5418771 B2 JP5418771 B2 JP 5418771B2 JP 2009190033 A JP2009190033 A JP 2009190033A JP 2009190033 A JP2009190033 A JP 2009190033A JP 5418771 B2 JP5418771 B2 JP 5418771B2
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exhaust gas
gas treatment
main frame
treatment unit
muffler
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JP2011043078A (en
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博昭 藤田
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Mitsubishi Fuso Truck and Bus 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Exhaust Silencers (AREA)
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  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Description

本発明は、内燃機関から排出される排ガスの浄化を行う内燃機関の排気浄化装置に関する。   The present invention relates to an exhaust gas purification apparatus for an internal combustion engine that purifies exhaust gas discharged from the internal combustion engine.

ディーゼルエンジン（内燃機関）の排気浄化装置には、内燃機関から排出された排ガス中に還元剤を添加して浄化する構造がある。多くは、エンジンの排ガスが流通する排気通路の上流側にディーゼルパティキュレートフィルタ（以下、ＤＰＦという）を設け、下流側に選択還元型ＮＯｘ触媒（以下、ＳＣＲ触媒という）を設け、ＳＣＲ触媒の上流側の通路部分から、排ガス中に還元剤としての尿素水溶液を噴射させる構造が用いられる。   BACKGROUND ART An exhaust emission control device for a diesel engine (internal combustion engine) has a structure in which a reducing agent is added to an exhaust gas discharged from the internal combustion engine for purification. In many cases, a diesel particulate filter (hereinafter referred to as DPF) is provided upstream of an exhaust passage through which engine exhaust gas flows, a selective reduction type NOx catalyst (hereinafter referred to as SCR catalyst) is provided downstream, and an upstream of the SCR catalyst. A structure in which an aqueous urea solution as a reducing agent is injected into exhaust gas from the side passage portion is used.

こうした排気浄化装置では、車両への搭載性の向上のため、全長を抑えたコンパクトな構造が求められる。そのため、排気浄化装置には、箱形の外殻ケース内に、同ケース内部の一部を折返路として活用してＤＰＦとＳＣＲ触媒を並列に収める並列タイプが多く提案されている（特許文献１を参照）。   Such an exhaust purification device is required to have a compact structure with a reduced overall length in order to improve mountability on a vehicle. For this reason, many exhaust purification apparatuses have been proposed in which a DPF and an SCR catalyst are accommodated in parallel in a box-shaped outer shell case by utilizing a part of the case as a return path (Patent Document 1). See).

特開２００７− ８５２４７号公報JP 2007-85247 A

通常、排気浄化装置は、車両のシャシフレームの側部に支持させて取り付けられる。箱形の外殻ケース内にＤＰＦとＳＣＲ触媒を並列に収めた並列タイプの排気浄化装置も、外殻ケースを支持装置で車両のシャシフレームの側部に支持させる。
ところが、排気浄化装置は、重量の有る装置である。特に上記した並列タイプの排気浄化装置は、折返路が外殻ケース内の一部で形成され、排ガスが周囲から流れ込む構造なので、圧力損失は抑えられるものの、箱形の外郭ケースは、内側から排ガスの圧力（内圧）を受けるため、ケースの面部分の各部に補強部材を設けて、膨張を抑えることが求められる。 Usually, the exhaust emission control device is attached to a side portion of a vehicle chassis frame. A parallel type exhaust gas purification apparatus in which a DPF and an SCR catalyst are housed in parallel in a box-shaped outer shell case also supports the outer shell case on the side of the chassis frame of the vehicle.
However, the exhaust emission control device is a heavy device. In particular, the above-described parallel type exhaust gas purification device has a structure in which the return path is formed in a part of the outer shell case and the exhaust gas flows from the surroundings, so that pressure loss can be suppressed, but the box-shaped outer case has an exhaust gas from the inside. In order to receive this pressure (internal pressure), it is required to provide a reinforcing member in each part of the surface portion of the case to suppress expansion.

このため、特に外殻ケースを用いた排ガス浄化装置は、構造上、かなりの重量を有した重量物となり、同装置を支持する支持装置は、過大な応力が加わりやすく、かなりの負担となっていた。
そこで、本発明の目的は、支持負担が抑えられるコンパクトな並列タイプの内燃機関の排気浄化装置を提供することにある。 For this reason, in particular, the exhaust gas purification device using the outer shell case has a heavy structure due to its structure, and the support device that supports the device is subject to excessive stress and is a considerable burden. It was.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a compact parallel type internal combustion engine exhaust gas purification apparatus that can suppress a support burden.

請求項１の発明は、上記目的を達成するために、車両のシャシフレームに装置本体を支持させて車両に搭載される内燃機関の排気浄化装置であって、装置本体は、円筒形容器内にパティキュレートフィルタを収容して構成される第１排ガス処理部と、円筒形容器内に選択還元型ＮＯｘ触媒を収容して構成される第２排ガス処理部とを上下２段に並行に配設するとともに両者間を分割式の中間パイプ部で着脱可能に接続して構成される上下２段式の本体部と、選択還元型ＮＯｘ触媒の上流側から排ガス中に添加剤を添加する添加剤添加装置とを有して構成され、上段に位置する第１排ガス処理部および第２排ガス処理部の一方の排ガス処理部が、シャシフレームの車幅方向両側を構成するメインフレーム部材のうちの片側のメインフレーム部材の車幅方向外側で、メインフレーム部材の車幅方向外側へ前記排ガス処理部の全長方向が張り出るように配置され、下段に位置する他方の排ガス処理部が、メインフレーム部材の下側で、上段の排気ガス処理部と並んで全長方向がメインフレーム部材の車幅方向外側へ張り出るように配置され、第１および第２排ガス処理部の配置されるメインフレーム部材の上部と下部とには、第１および第２排ガス処理部の上部に沿ってそれぞれ車幅方向外側に張り出す上下２段のハンガ部材が設けられ、第１および第２排ガス処理部の各円筒形容器が、各排ガス処理部の上側に位置する各ハンガ部材に吊持部材で吊持される構成とした。 In order to achieve the above object, the invention of claim 1 is an exhaust purification device for an internal combustion engine mounted on a vehicle with the device body supported by a chassis frame of the vehicle, wherein the device body is contained in a cylindrical container. A first exhaust gas processing unit configured to accommodate the particulate filter and a second exhaust gas processing unit configured to store the selective reduction type NOx catalyst in a cylindrical container are arranged in parallel in two upper and lower stages. In addition, an upper and lower two-stage main body configured by detachably connecting the two with a split-type intermediate pipe, and an additive addition device for adding an additive into exhaust gas from the upstream side of the selective reduction type NOx catalyst One exhaust gas treatment part of the first exhaust gas treatment part and the second exhaust gas treatment part located in the upper stage is configured as a main frame member on one side of main frame members constituting both sides in the vehicle width direction of the chassis frame. Frame member Outside the vehicle width direction, the exhaust gas treatment part is disposed so that the full length direction of the exhaust gas treatment part protrudes outside the main frame member in the vehicle width direction, and the other exhaust gas treatment part located in the lower stage is located on the lower side of the main frame member. The exhaust gas treatment part of the main frame member is arranged so that the full length direction projects outward in the vehicle width direction of the main frame member, and the upper and lower parts of the main frame member where the first and second exhaust gas treatment parts are arranged, Two upper and lower hanger members projecting outward in the vehicle width direction along the upper portions of the first and second exhaust gas treatment units are provided, and the cylindrical containers of the first and second exhaust gas treatment units are respectively connected to the exhaust gas treatment units. It was set as the structure hung with each hanger member located on the upper side of this by the suspension member .

同構成によると、排気浄化装置は、装置本体が、円筒形容器がもつ剛性強度に優れる特性を活かして、円筒形容器にパティキュレートフィルタが内蔵の第１排ガス処理部、同じく選択還元型ＮＯｘ触媒が内蔵の第２排ガス処理部を上下２段に並行に配設した簡素かつ軽量な構造で構成され、当該剛性強度に優れた第１および第２排ガス処理部の円筒形容器を、それぞれ吊持部材により、シャシフレームのメインフレーム部材の上下部から張り出たハンガ部材に支持することによって、できるだけ負担をかけずに車両に搭載される。 According to the configuration, the exhaust emission control device, instrumentation Okimoto body, taking advantage of the characteristics excellent in rigidity and strength with the cylindrical container, the first exhaust gas treatment unit particulate filter is incorporated in the cylindrical container, also a selective reduction type NOx The cylindrical containers of the first and second exhaust gas treatment units , each of which has a simple and lightweight structure in which the second exhaust gas treatment units with built-in catalysts are arranged in parallel in two upper and lower stages, each having excellent rigidity and strength, are respectively suspended. The holding member supports the hanger member protruding from the upper and lower portions of the main frame member of the chassis frame, so that it can be mounted on the vehicle with as little burden as possible.

請求項２の発明は、さらにメインフレーム部材から車幅方向外側に張り出す排ガス処理部の張り出し量ができるだけ抑えられるよう、下段に配置される排ガス処理部は、メインフレーム部材の下側から、一部が当該メインフレーム部材の下側に隠れるようにして張り出せるものとした。
請求項３の発明は、さらに効果的に排ガス処理部の張り出しが抑えられるよう、下段に配置される排ガス処理部には、全長が長くなりやすい選択型ＮＯｘ触媒を収めた第２排ガス処理部を用いた。 According to another aspect of the invention, to further overhang amount of the exhaust gas treatment section projecting outward in the vehicle width direction from the main frame member is possible to suppress exhaust gas treatment unit arranged in the lower part, the lower side of the main frame member, one part is assumed to put out Ri Zhang as hidden under side of the main frame member.
The invention according to claim 3, further effective to overhang the exhaust gas treatment unit is suppressed, the exhaust gas treatment unit which is arranged in the lower part, the second exhaust gas treatment unit which total length videos prone selective NOx catalyst longer Using.

請求項１の発明によれば、装置本体を、強度的に優れる円筒形容器を用いて構成された第１および第２排ガス処理部を上下２段に配置させた簡素な並列構造から構成して軽量にし、かつ強度的に優れた円筒形容器を、それぞれ吊持部材、ハンガ部材により、第１および第２排ガス処理部毎に、シャシフレームのメインフレーム部材の上下部に支持させ、加わる重量を分散させたから、排気浄化装置は、できるだけ負担をかけずに車両に搭載される。
それ故、支持負担が抑えられるコンパクトな並列タイプの排気浄化装置が提供できる。 According to the first aspect of the present invention, the apparatus main body is constituted by a simple parallel structure in which the first and second exhaust gas treatment units configured using a cylindrical container having excellent strength are arranged in two upper and lower stages. and lightweight, and the strength superior cylindrical container, each lifting member, the hanger member, the first and every second exhaust gas treatment unit, is supported on the upper and lower portions of the main frame members of the chassis frame, pressurized Waru weight Therefore, the exhaust emission control device is mounted on the vehicle with as little burden as possible.
Therefore, it is possible to provide a compact parallel type exhaust purification device that can suppress a support burden.

しかも、支持は、軽量化に伴い簡単なハンガ構造ですむ。
請求項２の発明によれば、排気浄化装置は、メインフレーム部材からの張り出し量をできるだけ抑えながらコンパクトに車両に搭載できる。
請求項３の発明によれば、全長が長くなりやすい傾向の有る選択型ＮＯｘ触媒を収めた第２排ガス処理部の特性を考慮して、効果的に排ガス処理部の張り出しを抑えることができる。 Moreover, the support can be a simple hanger structure as the weight is reduced .
According to the invention of claim 2 , the exhaust emission control device can be mounted on the vehicle in a compact manner while suppressing the amount of protrusion from the main frame member as much as possible.
According to the third aspect of the present invention, it is possible to effectively suppress the overhang of the exhaust gas treatment unit in consideration of the characteristics of the second exhaust gas treatment unit containing the selective NOx catalyst that tends to be long in total length.

本発明の一実施形態に係る排気浄化装置を、同装置を搭載した車両と共に示す側面図。1 is a side view showing an exhaust emission control device according to an embodiment of the present invention together with a vehicle equipped with the device. 同排気浄化装置を拡大して示す斜視図。The perspective view which expands and shows the same exhaust gas purification apparatus. 図２中のＡ−Ａ線に沿う断面図。Sectional drawing in alignment with the AA in FIG. 図２中の矢視Ｂから見た側面図。The side view seen from the arrow B in FIG.

以下、本発明を図１ないし図４に示す一実施形態にもとづいて説明する。
図１は、車両、例えばトラクタの概略的な側面を示していて、図１中１は、車体を構成する車両前後方向に沿って延びるラダー式シャシフレームで、２は同シャシフレーム１の車幅方向両側を形成する一対（２本）のメインフレーム（車両前後方向に延びる部材：本願のメインフレーム部材に相当）を示している。３は、シャシフレーム１の前部側に設けた前輪、４は同じくキャビン、５は同じくディーゼルエンジン（本願の内燃機関に相当）、６は同ディーゼルエンジン５の出力部に連結されたトランスミッション、７はメインフレーム２の後部側に設けた後輪をそれぞれ示している。 Hereinafter, the present invention will be described based on an embodiment shown in FIGS.
FIG. 1 shows a schematic side view of a vehicle, for example, a tractor. In FIG. 1, reference numeral 1 denotes a ladder chassis frame extending in the vehicle front-rear direction constituting the vehicle body, and reference numeral 2 denotes a vehicle width of the chassis frame 1. A pair of (two) main frames (members extending in the vehicle front-rear direction : corresponding to the main frame members of the present application ) forming both sides in the direction are shown. 3 is a front wheel provided on the front side of the chassis frame 1, 4 is also a cabin, 5 is a diesel engine (corresponding to the internal combustion engine of the present application), 6 is a transmission connected to an output part of the diesel engine 5, 7 Indicates rear wheels provided on the rear side of the main frame 2.

シャシフレーム２の両側には、図示はしないが燃料タンク、バッテリなど各種機器が支持される。また片側のメインフレーム２のうち、メインフレーム２の近傍の空いた個所、例えば助手席側のメインフレーム２の前部には、排気浄化装置、例えば尿素添加式の排気浄化装置１０が設けられている。図２にはこの排気浄化装置１０の全体が示され、図３および図４には同排気浄化装置１０の各部が示されている。   Although not shown, various devices such as a fuel tank and a battery are supported on both sides of the chassis frame 2. Further, an exhaust purification device, for example, a urea addition type exhaust purification device 10 is provided at a vacant portion in the vicinity of the main frame 2 of the main frame 2 on one side, for example, the front portion of the main frame 2 on the passenger seat side. Yes. FIG. 2 shows the entire exhaust emission control device 10, and FIGS. 3 and 4 show each part of the exhaust emission purification device 10.

図１〜図４に示されるように排気浄化装置１０には、メインフレーム２横のスペースを活用してコンパクトに搭載されるよう、ディーゼルパティキュレートフィルタ１２（以下、ＤＰＦ１２という）と、選択還元型ＮＯｘ触媒であるアンモニア選択還元型ＮＯｘ触媒１４（以下、ＳＣＲ触媒１４という）とを並行に配置した上下２段式の構造が用いられている。この並列タイプの排気浄化装置１０には、支持負担をできるだけ抑えた車両搭載を可能とした工夫が施されている。同工夫には、できるだけ簡素な構造で並列化にした本体構造１５（本願の装置本体に相当）と、同本体構造１５の重量を分散させてシャシフレーム１に支持させる支持構造３０（本願の支持装置に相当）とを併用した技術が用いられている。   As shown in FIG. 1 to FIG. 4, a diesel particulate filter 12 (hereinafter referred to as DPF 12) and a selective reduction type are installed in the exhaust purification device 10 so as to be compactly mounted utilizing the space next to the main frame 2. An upper and lower two-stage structure is used in which an ammonia selective reduction type NOx catalyst 14 (hereinafter referred to as SCR catalyst 14), which is a NOx catalyst, is arranged in parallel. The parallel type exhaust emission control device 10 is devised so that it can be mounted on a vehicle with a support load minimized. In the same idea, a main body structure 15 (corresponding to the apparatus main body of the present application) arranged in parallel with a simple structure as much as possible and a support structure 30 (support of the present application) for supporting the chassis frame 1 by dispersing the weight of the main body structure 15 are used. (Equivalent to the device) is used in combination.

図２〜図４を参照して、本体構造１５を説明すると、これには剛性強度に優れる部品である２つの円筒形のマフラケーシング１６，１７（いずれも本願の筒形容器に相当）を用いて、上流側マフラ１８（本願の第１排ガス処理部に相当）と下流側マフラ１９（本願の第２排ガス処理部に相当）とが上下２段に並んだ本体部２０を構成し、同本体部２０に尿素水溶液（還元剤に相当）を噴霧する噴霧装置２１（本願の還元剤添加装置に相当）を設けた構造が用いてある。 The main body structure 15 will be described with reference to FIGS. 2 to 4. For this, two cylindrical muffler casings 16 and 17 (both corresponding to the cylindrical container of the present application) which are parts having excellent rigidity and strength are used. The upstream muffler 18 (corresponding to the first exhaust gas treatment part of the present application) and the downstream muffler 19 (corresponding to the second exhaust gas treatment part of the present application) constitute a main body part 20 arranged in two upper and lower stages. A structure in which a spraying device 21 (corresponding to the reducing agent adding device of the present application) for spraying an aqueous urea solution (corresponding to the reducing agent) is provided in the unit 20 is used.

具体的には上流側マフラ１８は、両端に端壁１６ａを有する円筒形のマフラケーシング１６内に、排気ガス中のパティキュレートマター（以下、ＰＭという）を捕集するＤＰＦ１２を、例えば当該ＤＰＦ１２を連続再生する前段酸化触媒２２（前段触媒）と共に収めて構成される。下流側マフラ１９は、両端に端壁１７ａを有する筒形のマフラケーシング１７内に、例えば２つのＳＲＣ触媒１４を、ＳＣＲ触媒１４から流出したアンモニアを抑える後段酸化触媒２３（後段触媒）と共に収めて構成される。これらマフラ１８，１９が、上下２段、例えば上流側マフラ１８を上側に、下流側マフラ１９を下側に配置したレイアウトで隣接して並行に配置される。このうち上流側マフラ１８の上流側の端部周壁には入口部２４が設けられ、同じく下流側マフラ１９の下流側の端壁１７ａには出口部２５が設けられる。   Specifically, the upstream-side muffler 18 includes a DPF 12 that collects particulate matter (hereinafter referred to as PM) in exhaust gas in a cylindrical muffler casing 16 having end walls 16 a at both ends, for example, the DPF 12. It is configured to be housed together with the pre-stage oxidation catalyst 22 (pre-stage catalyst) that is continuously regenerated. The downstream muffler 19 is configured such that, for example, two SRC catalysts 14 are accommodated in a cylindrical muffler casing 17 having end walls 17a at both ends together with a rear oxidation catalyst 23 (rear catalyst) for suppressing ammonia flowing out from the SCR catalyst 14. Composed. These mufflers 18 and 19 are arranged adjacently and in parallel in a layout in which the upper muffler 18 is arranged on the upper side and the downstream muffler 19 is arranged on the lower side. Of these, an inlet 24 is provided on the upstream peripheral wall of the upstream muffler 18, and an outlet 25 is provided on the downstream end wall 17 a of the downstream muffler 19.

反対側の上流側マフラ１８の下流側の端部と下流側マフラ１９の上流側の端部間は通路で連通する。具体的には、隣接する各マフラケーシング１６，１７のケーシング周壁部分間が中間パイプ部材２６（本願の中間パイプ部に相当）で接続される。つまり、本体部２０は、ＤＰＦ１２や前段酸化触媒２２を収めた円筒形のマフラケーシング１６（剛性強度に優れる部品）と、ＳＣＲ触媒１４や後段酸化触媒２３を収めた円筒形のマフラケーシング１７（剛性強度に優れる部品）と、中間パイプ部材２６とを組み合わせた簡素な構造で構成される。   The downstream end of the upstream muffler 18 on the opposite side and the upstream end of the downstream muffler 19 communicate with each other through a passage. Specifically, the casing peripheral wall portions of the adjacent muffler casings 16 and 17 are connected by an intermediate pipe member 26 (corresponding to the intermediate pipe portion of the present application). That is, the main body 20 includes a cylindrical muffler casing 16 (part having excellent rigidity) containing the DPF 12 and the front-stage oxidation catalyst 22, and a cylindrical muffler casing 17 (stiffness) containing the SCR catalyst 14 and the rear-stage oxidation catalyst 23. It is configured with a simple structure in which a component having excellent strength) and the intermediate pipe member 26 are combined.

なお、中間パイプ部材２６には、中間部から分割され、相互が継手部材、例えばフランジ継手２６ａで着脱可能に連結された分割式構造が用いてある。上流側マフラ１８より若干、全長の長い下流側マフラ１９は、中間パイプ部材２６側の端部を上流側マフラ１８の端にほぼ揃え、反対側の端を上流側マフラ１８から突出させてある（段違い）。またＤＰＦ１２のメンテナンス作業が行ないやすいよう、マフラケーシング１６には、ＤＰＦ１２を挟んだ両側で分割し、相互を継手部材、例えば一対のフランジ継手１６ｂで着脱可能に連結した構造が用いられ、ＤＰＦ１２がケーシング部分１６ｃごと、本体部２０から取り外せる構造にしてある。   Note that the intermediate pipe member 26 uses a split structure in which the intermediate pipe member 26 is divided from the intermediate portion and is detachably connected to each other by a joint member, for example, a flange joint 26a. The downstream muffler 19 that is slightly longer than the upstream muffler 18 has the end on the intermediate pipe member 26 side substantially aligned with the end of the upstream muffler 18, and the opposite end protrudes from the upstream muffler 18 ( Difference). Further, in order to facilitate the maintenance work of the DPF 12, the muffler casing 16 has a structure in which the DPF 12 is divided on both sides sandwiching the DPF 12 and is mutually connected by a joint member, for example, a pair of flange joints 16b. Each part 16c is structured to be removable from the main body part 20.

噴霧装置２１は、例えば図２〜図４に示されるようにＤＰＦ１２の出口端と中間パイプ部材２６の出口との間に形成されている扁平な拡張室２８に設けられる。すなわち、例えば噴霧装置２１は、尿素タンク内の尿素水溶液（還元剤）を狭角のコーン状の噴霧形状で噴霧するノズル部（図示しない）を有して構成される。同噴霧装置２１は、例えば中間パイプ部材２６と反対側のマフラケーシング１６の周壁部分、例えば中間パイプ部材２６の軸心を延長した周壁部分に配置され、同部分に配置されたノズル部から、尿素水溶液が、狭角の噴霧形状で拡張室２８内へ噴霧されるようにしている。これで、限られたスペースの拡張室２８を用いて尿素水溶液と排ガスとが良好に混じり合うようにしている。
このような構造から本体構造１５が構成してある。 The spraying device 21 is provided in a flat expansion chamber 28 formed between the outlet end of the DPF 12 and the outlet of the intermediate pipe member 26 as shown in FIGS. That is, for example, the spray device 21 is configured to include a nozzle portion (not shown) that sprays a urea aqueous solution (reducing agent) in a urea tank in a narrow-angle cone-shaped spray shape. The spray device 21 is disposed, for example, on a peripheral wall portion of the muffler casing 16 opposite to the intermediate pipe member 26, for example, a peripheral wall portion obtained by extending the axis of the intermediate pipe member 26, and from the nozzle portion disposed in the same portion, urea The aqueous solution is sprayed into the expansion chamber 28 in a narrow-angle spray shape. Thus, the urea aqueous solution and the exhaust gas are mixed well by using the expansion chamber 28 in a limited space.
The main body structure 15 is composed of such a structure.

一方、図２〜図４に示されるように支持構造３０には、上流側マフラ１７、下流側マフラ１８をそれぞれ独立してシャシフレーム１に支持させる構造が用いられている。この支持構造３０にはハンガ構造が用いられている。同ハンガ構造には、例えばメインフレーム２の側部から車幅方向外側にそれぞれ張り出す上下２段のハンガ部材３２，３３と、ハンガ部材３２に上流側マフラ１８を吊持させる吊持部材３５と、ハンガ部材３３に下流側マフラ１９を吊持させる吊持部材４０とを組み合わせた構造が用いられる。   On the other hand, as shown in FIGS. 2 to 4, the support structure 30 uses a structure in which the upstream muffler 17 and the downstream muffler 18 are independently supported by the chassis frame 1. A hanger structure is used for the support structure 30. The hanger structure includes, for example, upper and lower two-stage hanger members 32 and 33 that project outward from the side of the main frame 2 in the vehicle width direction, and a suspension member 35 that suspends the upstream muffler 18 on the hanger member 32. A structure in which the hanger member 33 and the suspension member 40 that suspends the downstream muffler 19 are combined is used.

具体的には上段のハンガ部材３２には、車両前後方向に並ぶ一対（２本）のパイプ部材が用いられる。そして、同パイプ部材の一端部がメインフレーム２の上部に取着されたベース３２ｂに形成してある支持孔部３２ａに差込み固定（着脱可能）されることによって、パイプ部材３２ａの他端側をメインフレーム２から外側に並行に張り出させている。下段のハンガ部材３３も同様に車両前後方向に並ぶ一対（２本）のパイプ部材が用いられる。すなわち、同様にパイプ部材の一端部をメインフレーム２の下部に取着されたベース３３ｂに形成してある支持孔部３３ａに差込み固定（着脱可能）されることによって、パイプ部材の他端側をメインフレーム２から外側に並行に張り出せている。   Specifically, a pair of (two) pipe members arranged in the vehicle front-rear direction are used for the upper hanger member 32. Then, one end of the pipe member is inserted into and fixed to (removable from) the support hole 32a formed in the base 32b attached to the upper portion of the main frame 2, so that the other end of the pipe member 32a is attached. The main frame 2 projects outward in parallel. Similarly, a pair of (two) pipe members arranged in the vehicle front-rear direction are also used for the lower hanger member 33. That is, similarly, one end of the pipe member is inserted and fixed (detachable) into the support hole 33a formed in the base 33b attached to the lower part of the main frame 2, so that the other end of the pipe member is fixed. Projecting from the main frame 2 to the outside in parallel.

図２〜図４に示されるように吊持部材３５は、マフラケーシング１６の周壁の上部の各部に取着した複数のケーシング側ブラケット３６と、これらケーシング側ブラケット３６をパイプ部材の各部に取着してある複数のハンガ側ブラケット３８につなぐアーム部材３９とを組み合わせた構造が用いてある。   As shown in FIGS. 2 to 4, the suspension member 35 includes a plurality of casing side brackets 36 attached to the respective upper portions of the peripheral wall of the muffler casing 16, and these casing side brackets 36 are attached to respective portions of the pipe member. A structure in which an arm member 39 connected to a plurality of hanger side brackets 38 is combined is used.

具体的にはケーシング側ブラケット３６は、マフラケーシング１６の片側となる、ＤＰＦ１２が収めてあるケーシング部分１６ｃの軸心を挟んだ斜め両側の地点や、入口部２４付近のケーシング部分の軸心を挟んだ斜め両側の地点にそれぞれ突設されている。ハンガ側ブラケット３８は、いずれもマフラケーシング１６の軸心側に向かって斜めに突き出ていて、アーム部材３９でブラケット３６，３８間を連結することによって、上流側マフラ１８を所定の位置に吊持させている。またアーム部材３９の各端部は、着脱可能な連結具、例えばボルトナットなどにより着脱可能となっている。この着脱構造を用いて、ＤＰＦ１２が有るケーシング部分１６ｃの取り外しを可能にしている。   Specifically, the casing side bracket 36 sandwiches the axis of the casing part near the inlet 24 and the point on both sides of the muffler casing 16 on both sides of the axis of the casing part 16c in which the DPF 12 is housed. It is protruding at each point on both sides. Each of the hanger side brackets 38 protrudes obliquely toward the axial center side of the muffler casing 16, and the upstream muffler 18 is suspended at a predetermined position by connecting the brackets 36 and 38 with the arm member 39. I am letting. Each end portion of the arm member 39 is detachable by a detachable connector such as a bolt and nut. Using this detachable structure, the casing portion 16c having the DPF 12 can be removed.

吊持部材４０も、図２〜図４に示されるように同様にマフラケーシング１７の周壁の各上部に取着した複数のケーシング側ブラケット４２と、これらケーシング側ブラケット４２をパイプ部材の各部に取着してある複数のハンガ側ブラケット４５につなぐアーム部材４７とを組み合わせた構造が用いてある。   2 to 4, the suspension member 40 is similarly attached to each upper part of the peripheral wall of the muffler casing 17, and a plurality of casing side brackets 42 are attached to each part of the pipe member. A structure in which an arm member 47 connected to a plurality of hanger-side brackets 45 attached is combined is used.

具体的にはケーシング側ブラケット４２は、マフラケーシング１７の片側である、中間パイプ部材２６付近のケーシング部分の軸心を挟んだ斜め両側の地点や、反対側である出口部２５付近のケーシング部分の軸心を挟んだ斜め両側の地点にそれぞれ突設されている。ハンガ側ブラケット４５は、いずれもマフラケーシング１７の軸心側に向かって斜めに突き出ていて、アーム部材４７でブラケット４２，４５間を連結することによって、下流側マフラ１９も上流側マフラ１８と同様に定位置に吊持させている。   Specifically, the casing-side bracket 42 is located on one side of the muffler casing 17, at a point on both sides of the casing portion near the intermediate pipe member 26, or on the opposite side of the casing portion near the outlet portion 25. Projected at each point on both sides of the axis. Each of the hanger side brackets 45 projects obliquely toward the axial center side of the muffler casing 17, and the downstream side muffler 19 is the same as the upstream side muffler 18 by connecting the brackets 42, 45 with the arm member 47. Is suspended in a fixed position.

この吊持に際し下流側マフラ１９が、できるだけシャシフレーム１から車幅方向外側の張り出さないよう、上流側マフラ１８より突き出た端部分（本願の一部に相当）はメインフレーム２の下側に配置され、突き出た端部分をメインレーム２の下側に隠れさせている。なお、アーム部材４７の各端部も、上記アーム部材３９と同様、着脱可能な連結具、例えばボルトナットにより着脱可能に連結してある。   An end portion (corresponding to a part of the present application) projecting from the upstream muffler 18 is located below the main frame 2 so that the downstream muffler 19 does not protrude from the chassis frame 1 as far as possible in the vehicle width direction. The end portion that is arranged and protrudes is hidden under the main frame 2. Each end portion of the arm member 47 is also detachably connected by a detachable connector, for example, a bolt and nut, similarly to the arm member 39.

こうした吊持構造により、上流側マフラ１８、下流側マフラ１９は、それぞれ独立させてシャシフレーム１に支持させてある。そして、入口部２４は、ディーゼルエンジン５から延びる排気管５ａに接続され、出口部２５は大気側の排気管５ｂに接続され、ディーゼルエンジン１から排出された排ガスが浄化されるようにしてある。   With such a suspension structure, the upstream muffler 18 and the downstream muffler 19 are independently supported by the chassis frame 1. And the inlet part 24 is connected to the exhaust pipe 5a extended from the diesel engine 5, and the outlet part 25 is connected to the exhaust pipe 5b on the atmosphere side so that the exhaust gas discharged from the diesel engine 1 is purified.

すなわち、ディーゼルエンジン１から排出された排ガスは、ＤＰＦ１２を通過するときに排ガス中のＰＭが捕集される。その後、拡散室２８を通過する排ガス中に、噴霧装置２１のノズル部から尿素水溶液が噴霧され、拡張室２８内で尿素水溶液が排ガスと混合される。この混合により尿素水溶液は、排ガスの排気熱、排ガス中の水蒸気により加水分解され、アンモニアが生成される。このアンモニアが、中間パイプ部材２６内を通って、ＳＣＲ触媒１４に至り、同ＳＣＲ触媒１４におけるＮＯｘ還元作用により、排ガス中のＮＯｘが還元される。そして、浄化を終えた排ガスが出口部２５から排出される。   That is, when exhaust gas discharged from the diesel engine 1 passes through the DPF 12, PM in the exhaust gas is collected. Thereafter, the urea aqueous solution is sprayed from the nozzle portion of the spraying device 21 into the exhaust gas passing through the diffusion chamber 28, and the urea aqueous solution is mixed with the exhaust gas in the expansion chamber 28. By this mixing, the urea aqueous solution is hydrolyzed by the exhaust heat of the exhaust gas and the water vapor in the exhaust gas to generate ammonia. The ammonia passes through the intermediate pipe member 26 and reaches the SCR catalyst 14, and NOx in the exhaust gas is reduced by the NOx reduction action in the SCR catalyst 14. Then, the exhaust gas after purification is discharged from the outlet portion 25.

こうした浄化を行なっているとき、排気浄化装置１０を支持する支持構造３０は、エンジンや走行などに伴う振動などが加わる。ここで、排気浄化装置１０の重量が重いと、かなり同部分に応力が加わる。
このとき、排気浄化装置１０は、重量を抑えた構造、さらには同重量を分散させてシャシフレーム１に支持する構造を採用しているため、支持構造３０に加わる応力は少なく抑えられる。 During such purification, the support structure 30 that supports the exhaust purification device 10 is subjected to vibrations associated with the engine and traveling. Here, if the exhaust purification device 10 is heavy, stress is applied to the same portion.
At this time, the exhaust emission control device 10 employs a structure in which the weight is suppressed, and further, a structure in which the weight is dispersed and supported by the chassis frame 1, so that the stress applied to the support structure 30 can be suppressed to a low level.

すなわち、排気浄化装置１０の本体構造１５には、強度的に優れた円筒形のマフラケーシング１６（円筒容器）にＤＰＦ１２や前段酸化触媒２２を収めた上流側マフラ１８と、同じく円筒形のマフラケーシング１７（円筒容器）にＳＣＲ触媒１４や後段酸化触媒２３を収めた下流側マフラ１９とを中間パイプ部材２６を用い上下２段に配置させるという簡素な並列構造が用いられているので、格段に重量は抑えられ、軽量となる。しかも、支持構造３０は、強度的に優れた各マフラケーシング１６，１７をそれぞれメインフレーム２の各部に支持させるという、マフラ毎、独立させて支持させる構造を用いているので、排気浄化装置１０の重量は、さらに主部毎に分散されながらシャシフレーム１（車体）に支持される。   That is, the main body structure 15 of the exhaust purification apparatus 10 includes an upstream muffler 18 in which the DPF 12 and the upstream oxidation catalyst 22 are housed in a cylindrical muffler casing 16 (cylindrical container) excellent in strength, and a cylindrical muffler casing that is also cylindrical. 17 (cylindrical container) has a simple parallel structure in which the downstream muffler 19 in which the SCR catalyst 14 and the post-stage oxidation catalyst 23 are accommodated is arranged in two upper and lower stages using the intermediate pipe member 26. Is reduced and lighter. In addition, the support structure 30 uses a structure in which the muffler casings 16 and 17 that are excellent in strength are supported by the respective parts of the main frame 2 so that each muffler is supported independently. The weight is further supported by the chassis frame 1 (vehicle body) while being distributed for each main part.

このとき各支持構造３０に加わる応力は、排気浄化装置１９から作用する重量に関係するから、支持構造３０に加わる応力は格段に抑えられる。つまり、排気浄化装置１０は、できるだけ支持負担を与えずに車両にコンパクトに搭載することができる。
それ故、支持負担が抑えられるコンパクトな並列タイプの排気浄化装置１０が提供できる。 At this time, the stress applied to each support structure 30 is related to the weight acting from the exhaust emission control device 19, and therefore the stress applied to the support structure 30 is remarkably suppressed. That is, the exhaust emission control device 10 can be compactly mounted on the vehicle with as little support load as possible.
Therefore, it is possible to provide a compact parallel type exhaust purification device 10 in which the support burden is suppressed.

特に下段の下流側マフラ１９の一部をメインフレーム２の下側に隠れるように配置すると、排気浄化装置１０の車幅方向外側への張り出しは抑えられ、一層、コンパクトに排気浄化装置１０を車両に搭載できる。これは、当該下側に配置されるマフラが、全長寸法の長くなりやすい傾向のＳＣＲ触媒１４を内蔵した下流側マフラ１９であると、効果的である。また支持構造３０は、排気浄化装置１０の軽量化に伴い、強度的に優れる円筒形のケーシング１６，１７を利用した簡単な構造、具体的には上下２段のハンガ部材３２，３３と、各マフラケーシング１６，１７をハンガ部材３２，３３に吊持させる吊持部材３５，４０とを用いた簡単なハンガ構造ですむ。   In particular, if a part of the lower-stage downstream muffler 19 is arranged so as to be hidden under the main frame 2, the exhaust purification device 10 can be prevented from projecting outward in the vehicle width direction, and the exhaust purification device 10 can be more compactly mounted on the vehicle. Can be installed. This is effective when the muffler disposed on the lower side is a downstream muffler 19 having a built-in SCR catalyst 14 whose overall length tends to be long. The support structure 30 has a simple structure using cylindrical casings 16 and 17 that are superior in strength as the exhaust purification device 10 is reduced in weight, specifically, upper and lower hanger members 32 and 33, and A simple hanger structure using suspension members 35 and 40 for suspending the muffler casings 16 and 17 on the hanger members 32 and 33 is sufficient.

なお、本発明は一実施形態に限定されるものではなく、本発明の主旨を逸脱しない範囲内で種々可変して実施しても構わない。一実施形態では、拡張室の直径方向から尿素水溶液を噴霧する構造を用いたが、これに限らず、拡張室の端面方向から広角的に尿素水溶液を噴霧する構造を用いてもよい。 Note that the present invention is not limited to one embodiment, and various modifications may be made without departing from the spirit of the present invention . In one embodiment, the structure in which the urea aqueous solution is sprayed from the diameter direction of the expansion chamber is used. However, the structure is not limited thereto, and a structure in which the urea aqueous solution is sprayed in a wide angle from the end surface direction of the expansion chamber may be used .

１ シャシフレーム
１０ 排気浄化装置
１２ ディーゼルパティキュレートフィルタ
１４ アンモニア選択還元型ＮＯｘ還元触媒（選択還元型ＮＯｘ触媒）
１５ 本体構造（装置本体）
１６，１７ マフラケーシング（円筒形容器）
１８ 上流側マフラ（第１排ガス処理部）
１９ 下流側マフラ（第２排ガス処理部）
２０ 本体部
２１ 噴霧装置（添加剤添加装置）
２６ 中間パイプ部材（中間パイプ部）
３０ 支持構造（支持装置）
３２，３３ ハンガ部材
３５，４０ 吊持部材 DESCRIPTION OF SYMBOLS 1 Chassis frame 10 Exhaust gas purification device 12 Diesel particulate filter 14 Ammonia selective reduction type NOx reduction catalyst (selective reduction type NOx catalyst)
15 Body structure (device body)
16, 17 Muffler casing (cylindrical container)
18 Upstream muffler (first exhaust gas treatment section)
19 Downstream muffler (second exhaust gas treatment section)
20 Main body 21 Spraying device (additive adding device)
26 Intermediate pipe member (intermediate pipe part)
30 Support structure (support device)
32, 33 Hanger member 35, 40 Suspension member

Claims (3)

車両のシャシフレームに装置本体を支持させて車両に搭載される内燃機関の排気浄化装置であって、
前記装置本体は、
円筒形容器内にパティキュレートフィルタを収容して構成される第１排ガス処理部と、円筒形容器内に選択還元型ＮＯｘ触媒を収容して構成される第２排ガス処理部とを上下２段に並行に配設するとともに両者間を分割式の中間パイプ部で着脱可能に接続して構成される上下２段式の本体部と、前記選択還元型ＮＯｘ触媒の上流側から排ガス中に添加剤を添加する添加剤添加装置とを有して構成され、
前記上段に位置する前記第１排ガス処理部および前記第２排ガス処理部の一方の排ガス処理部が、前記シャシフレームの車幅方向両側を構成するメインフレーム部材のうちの片側のメインフレーム部材の車幅方向外側で、前記メインフレーム部材の車幅方向外側へ前記排ガス処理部の全長方向が張り出るように配置され、前記下段に位置する前記他方の排ガス処理部が、前記メインフレーム部材の下側で、前記上段の排気ガス処理部と並んで全長方向が前記メインフレーム部材の車幅方向外側へ張り出るように配置され、
前記第１および第２排ガス処理部の配置される前記メインフレーム部材の上部と下部とには、前記第１および第２排ガス処理部の上部に沿ってそれぞれ車幅方向外側に張り出す上下２段のハンガ部材が設けられ、
前記第１および第２排ガス処理部の各円筒形容器が、各排ガス処理部の上側に位置する各ハンガ部材に吊持部材で吊持される構成とした
ことを特徴とする内燃機関の排気浄化装置。 An exhaust purification device for an internal combustion engine mounted on a vehicle with the device body supported on a chassis frame of the vehicle,
The apparatus main body is
A first exhaust gas treatment unit configured by accommodating a particulate filter in a cylindrical container and a second exhaust gas treatment unit configured by accommodating a selective reduction type NOx catalyst in the cylindrical container are arranged in two upper and lower stages. An upper and lower two-stage main body portion that is arranged in parallel and is detachably connected between the two by a split-type intermediate pipe portion, and an additive into the exhaust gas from the upstream side of the selective reduction type NOx catalyst. An additive adding device to be added,
One of the first exhaust gas treatment unit and the second exhaust gas treatment unit located in the upper stage is a vehicle of a main frame member on one side of the main frame members constituting both sides in the vehicle width direction of the chassis frame. The other exhaust gas treatment part located at the lower stage is arranged on the lower side of the main frame member, arranged outside the width direction so that the full length direction of the exhaust gas treatment part protrudes outward in the vehicle width direction of the main frame member Then, the full length direction is arranged so as to protrude outward in the vehicle width direction of the main frame member along with the upper exhaust gas processing unit,
The upper and lower portions of the main frame member in which the first and second exhaust gas treatment units are arranged have two upper and lower stages projecting outward in the vehicle width direction along the upper portions of the first and second exhaust gas treatment units, respectively. Hanger members are provided,
Exhaust gas purification for an internal combustion engine, wherein each cylindrical container of the first and second exhaust gas treatment units is suspended by a hanger member on each hanger member located above each exhaust gas treatment unit apparatus. 前記下段に配置される排ガス処理部は、前記メインフレーム部材の下側から、一部が当該メインフレーム部材の下側に隠れるようにして張り出せてあることを特徴とする請求項１に記載の内燃機関の排気浄化装置。 Exhaust gas treatment unit disposed in the lower part, according to claim 1, wherein the lower side of the main frame member, a part which is characterized in that as hidden under side of the main frame members are put out Ri Zhang Exhaust gas purification device for internal combustion engine. 前記下段に配置される排ガス処理部は、第２排ガス処理部であることを特徴とする請求項２に記載の内燃機関の排気浄化装置。 The exhaust gas purification unit for an internal combustion engine according to claim 2 , wherein the exhaust gas treatment unit disposed in the lower stage is a second exhaust gas treatment unit .
JP2009190033A 2009-08-19 2009-08-19 Exhaust gas purification device for internal combustion engine Expired - Fee Related JP5418771B2 (en)

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JP5939943B2 (en) 2012-09-14 2016-06-22 ヤンマー株式会社 Engine equipment
EP2752327B1 (en) 2012-10-30 2016-09-28 Komatsu Ltd. Construction vehicle equipped with exhaust-gas post-processing device
JP6262440B2 (en) * 2013-04-08 2018-01-17 株式会社Kcm Wheel loader
JP6284281B2 (en) * 2016-04-07 2018-02-28 ヤンマー株式会社 Tractor
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