JP4202787B2 - Diesel particulate filter device - Google Patents

Diesel particulate filter device Download PDF

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Publication number
JP4202787B2
JP4202787B2 JP2003052872A JP2003052872A JP4202787B2 JP 4202787 B2 JP4202787 B2 JP 4202787B2 JP 2003052872 A JP2003052872 A JP 2003052872A JP 2003052872 A JP2003052872 A JP 2003052872A JP 4202787 B2 JP4202787 B2 JP 4202787B2
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Prior art keywords
filter
catalyst
side shell
flange
rear end
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JP2004263593A (en
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洋一 高橋
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Calsonic Kansei Corp
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Calsonic Kansei 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

Description

【０００１】
【発明の属する技術分野】
本発明は、ディーゼルエンジン等の排気中に含まれる微粒子物質（ＰＭ：パティキュレート）を捕集・処理するディーゼルパティキュレートフィルタ装置の技術分野に属する。
【０００２】
【従来の技術】
従来のディーゼルパティキュレートフィルタ装置は、装置内部の上流側に触媒を設け、下流側にフィルタを設け、触媒とフィルタの間に温度センサを設け、この位置での排気温度の状態を把握して排ガス中のパティキュレート低減のための制御に用いている（例えば、特許文献１参照。）。
【０００３】
【特許文献１】
特開２００１−７３７４８号公報（第７−８頁、第５図）
【０００４】
【発明が解決しようとする課題】
このような従来のディーゼルパティキュレートフィルタ装置では、次のような構造を取ることが多かった。
筒状のシェルを少なくとも２分割し、一方の内部に触媒を設け、一方の内部にフィルタを設け、分割部分のシェル端面部分の外周に環状のフランジをそれぞれ設け、フランジ面を合わせて複数箇所で締結する構造にし、一方のシェルにセンサ取付けボスを設け、このセンサ取付けボスに温度センサを取り付けるようにして、温度センサのセンサ部分がシェル内部の触媒とフィルタの間に挿入できるようにしていた。
このような構造を取る必要性としては、ディーゼルパティキュレートフィルタ装置を車両に装着して使用していくと、フィルタにエンジンオイル等のアッシュが堆積するため、フィルタ端部から清掃できることが必要とされるからである。
【０００５】
しかしながら、このような構造では、酸化触媒と分割用のフランジの間に制御用センサ（温度センサ）の取付けボスを溶接するため、取付けボスを溶接するスペースと分割用のフランジの分、触媒とフィルタが離れてしまっていた。
触媒とフィルタが離れると触媒とフィルタの間の容器表面積が大きくなり、容器から外部へ放熱される事でフィルタへ向かう排気の温度低下が生じてしまっていた。
また、外部への放熱量が増えると外周部等で熱害が問題となっていた。
また、このような構造では、容器の全長が長くなり、車両搭載性が悪くなってしまっていた。
【０００６】
これに対し、シェル端面からフィルタ又は触媒を突出させる構造にすると、強度的な問題があり、取り付けの難度が高くなり、また、突出部分の外周を保持材でカバーできないため損傷の危険性が高くなってしまうものであった。
【０００７】
本発明は、上記問題点に着目してなされたもので、その目的とするところは、触媒とフィルタの間の排気の温度低下を少なくし、周辺への熱害を少なくして安全性を向上でき、車両搭載性を向上できるディーゼルパティキュレートフィルタ装置を提供することにある。
【０００８】
【課題を解決するための手段】
上記目的を達成するため、請求項１記載の発明では、エンジンの排気系の途中に接続する筒状の容器本体内の上流側に排気中の微粒子物質を再燃焼しやすい状態にする酸化触媒を設け、下流側に排気中の微粒子物質を捕集して排気で再燃焼させるフィルタを設け、酸化触媒とフィルタの間に排気の状態を検知する排気用センサを設けたディーゼルパティキュレートフィルタ装置において、容器本体を触媒側シェルとフィルタ側シェルに少なくとも２分割にし、触媒側シェルの後端を触媒後端より後方に延長するとともに拡径した拡径後端部を設け、環状のフランジを拡径後端部の後端部の外周に設け、制御用センサの取付部をフランジより前方の拡径後端部の外周に設け、拡径後端部のフランジと面接するフランジをフィルタ側シェルの前端より後方の外周に設け、フィルタ側シェルの前端部を触媒側シェルの拡径後端部の内部に挿入するよう嵌合して両フランジを締結する構造にしたことを特徴とする手段とした。
【０００９】
【発明の作用と効果】
請求項１記載の発明では、触媒側シェルの拡径後端部の内部にフィルタ側シェルを挿入するように嵌合する。これにより、酸化触媒とフィルタの距離を近づけることができる。よって、酸化触媒とフィルタの間に位置する触媒側シェルの表面積部分を少なくする。よって、放熱面積が小さくなり、酸化触媒とフィルタの間の排気の温度低下を少なくすることができる。
また、放熱を少なくすることは、周辺への熱害を小さくするとともに周辺の機器との距離を近づけることができ車両搭載性を向上させる。
また、酸化触媒とフィルタを近づけることで装置全長を短くでき、車両搭載性がさらに向上できる。
【００１０】
【発明の実施の形態】
以下、本発明のディーゼルパティキュレートフィルタ装置を実現する実施の形態を、請求項１に係る発明に対応する実施例に基づいて説明する。
【００１１】
（実施例）
【００１２】
まず、構成を説明する。
図１は実施例のディーゼルパティキュレートフィルタ装置を示す断面図である。図１における主要符号を説明すると、１はＤＰＦ装置（ディーゼルパティキュレートフィルタ装置）、２は触媒側シェル（３,４と容器本体を構成する）、２１は拡散チャンバ、２２は触媒側フランジ、２３は拡径部（拡径後端部）、２４はセンサ取付けボス（制御用センサの取付部）、２５は酸化触媒、２６は触媒保持マット、２７は前方接続フランジ、３はフィルタ側シェル、３１はフィルタ側前方フランジ、３２はフィルタ側後方フランジ、３３はパティキュレートフィルタ（フィルタ）、３４はフィルタ保持マット、４は後方シェル、４１は縮流チャンバ、４２は後方接続フランジ、４３は後方シェル側フランジ、４４は後方拡径部、６は温度センサ（制御用センサ）、７はボルトナットである。
【００１３】
本実施例のＤＰＦ装置１は、図１に示すように大きく分けて、全体を３分割し、触媒側シェル２、フィルタ側シェル３、後方シェル４の３つで構成する。
まず、触媒側シェル２は、前端部を縮径した形状にし、排気系に接続するための前方接続フランジ２７を設ける。触媒側シェル２の前方内部には、内部に取り込んだ排気をパイプや板状物に設けた小孔を通すことで流れの方向を変えたり、通路を拡縮して、酸化触媒２５に向かう流れが中央と外周側などで均一な流れとなるようにするとともに、エンジンからの排ガス吐出音を消音する拡散チャンバ２１を設ける。
【００１４】
触媒側シェル２内部の拡散チャンバ２１の後方には、排気ガスを通過させながら排ガスを浄化するとともに、フィルタでススが再燃焼しやすいようにスス酸化イオンを生成する酸化触媒２５を、外周に触媒保持マット２６を巻回させて触媒側シェル２内部に設ける。
触媒側シェル２の後端には、酸化触媒２５の後端より後方で拡径する形状になる拡径部２３を設ける。この拡径部２３の後端外周には、環状に張り出した触媒側フランジ２２を設ける。さらに、この触媒側フランジ２２より前方の拡径部２３の外周には、触媒側シェル２の内部に連通する穴を有し、温度センサ６を取り付けるセンサ取付けボス２４を設ける。
【００１５】
次に、フィルタ側シェル３の外周の前端より所定距離後方位置に環状に張り出したフィルタ側前方フランジ３１を設ける。また、外周後端より所定距離前方位置には、フィルタ側後方フランジ３２を設ける。
このフィルタ側シェル３の前端と前端が略同じになるように、排気中に含まれるススを捕集し、捕集したススの再燃焼を行ってフィルタを再生するパティキュレートフィルタ３３を外周にフィルタ保持マット３４を巻回するようにしてフィルタ側シェル３の内部に設ける。
【００１６】
次に、フィルタ出口の流れをスムーズに後方接続フランジ４２から後方の排気管に流すとともに消音を行う縮流チャンバ４１を内部に備える後方シェル４を設ける。後方シェル４の前端には、拡径した後方拡径部４４を設け、後方拡径部４４の前端外周には環状に張り出した後方シェル側フランジ４３を設ける。
【００１７】
この触媒側シェル２、フィルタ側シェル３、後方シェル４を組み付ける際には、まず、触媒側シェル２の後端の拡径部２３の内部にフィルタ側シェル３の前端を挿入するように嵌合させる。この嵌合は拡径部２３の触媒側フランジ２２とフィルタ側前方フランジ３１が面接する位置まで行うようにする。次に触媒側フランジ２２とフィルタ側前方フランジ３１を面接した状態でボルトナット７により複数箇所を締結する。
【００１８】
このようにして触媒側シェル２とフィルタ側シェル３を取り付けたならば、フィルタ側シェル３の後端を後方シェル４の後方拡径部４４の内部に挿入して嵌合する。この嵌合は後方拡径部４４の後方シェル側フランジ４３とフィルタ側後方フランジ３２が面接するまで行い、後方シェル側フランジ４３とフィルタ側後方フランジ３２をボルトナット７で締結して取り付ける。
【００１９】
さらに、触媒側シェル２の拡径部２３のセンサ取付けボス２４に、ススが堆積した際ススを再生させる為、エンジン側のコンピュータユニットに排気の状態をフィードバックする温度センサ６を、センサ部分がセンサ取付けボス２４を貫通して触媒とフィルタの間に位置させるよう取り付ける。
【００２０】
次に作用を説明する。
［排気温度の低下防止作用］
本実施例では、図１に示すようにフィルタ側シェル３を触媒側シェル２の拡径部２３に挿入するように嵌合することによって、酸化触媒２５とパティキュレートフィルタ３３の位置を従来に比べて近づけることができる。すると、酸化触媒２５とパティキュレートフィルタ３３の間となる触媒側シェル２の表面積は小さくなり、放熱量が減少するので排気の温度低下を少なくする。
【００２１】
［周辺への熱害低減作用］
酸化触媒２５とパティキュレートフィルタ３３を近づけて触媒側シェル２の放熱量を少なくすることは、周辺の機器が熱で変形・故障等を起こすような熱害を低減する。
【００２２】
［車両搭載性の向上作用］
フィルタ側シェル３は前端を触媒側シェル２の拡径部２３の内部に挿入する構造にし、後端を後方シェル４の後方拡径部４４の内部に挿入する構造にしているので、装置全体の全長を短くすることができ、車両への搭載性が向上する。
また、触媒側シェル２からの放熱量を少なくして周辺機器への熱害を少なくするため、その分、周辺機器との距離を近づけることができ、車両への搭載性がさらに向上する。
【００２３】
次に、効果を説明する。
【００２４】
実施例のディーゼルパティキュレートフィルタ装置にあっては、下記に列挙する効果を得ることができる。
【００２５】
(1)エンジンの排気系の途中に接続する筒状の容器本体内の上流側に排気中の微粒子物質を再燃焼しやすい状態にする酸化触媒２５を設け、下流側に排気中の微粒子物質を捕集して排気で再燃焼させるパティキュレートフィルタ３３を設け、酸化触媒２５とフィルタの間に排気の状態を検知する温度センサ６を設けたＤＰＦ装置１において、容器本体を触媒側シェル２とフィルタ側シェル３と後方シェル４に分割し、触媒側シェル２の後端を酸化触媒２５後端より後方に延長するとともに拡径した拡径部２３を設け、環状の触媒側フランジ２２を拡径部２３の後端部の外周に設け、センサ取付けボス２４を触媒側フランジ２２より前方の拡径部２３の外周に設け、拡径部２３の触媒側フランジ２２と面接するフィルタ側前方フランジ３１をフィルタ側シェル３の前端より後方の外周に設け、フィルタ側シェル３の前端部を触媒側シェル２の拡径部２３の内部に挿入するよう嵌合して両フランジを締結する構造にしたため、酸化触媒２５とパティキュレートフィルタ３３の間の排気の温度低下を少なくし、周辺への熱害を少なくして安全性を向上でき、車両搭載性を向上できる。
【００２６】
以上、本発明のディーゼルパティキュレートフィルタ装置を実施例に基づき説明してきたが、具体的な構成については、これらの実施例に限られるものではなく、特許請求の範囲の各請求項に係る発明の要旨を逸脱しない限り、設計の変更や追加等は許容される。
例えば、実施例では、容器本体を触媒側シェル、フィルタ側シェル、後方シェルで構成したが、触媒側シェルと後方シェルで構成する構成にしてもよいし、他の構成にしてもよい。
また、実施例では、制御用センサとして温度センサを使用したが、Ｏ２センサ等の他のセンサを用いてもよく、制御方法によって決めればよい。
【図面の簡単な説明】
【図１】実施例のディーゼルパティキュレートフィルタ装置を示す断面図である。
【図２】従来例のディーゼルパティキュレートフィルタ装置を示す一部拡大断面図である。
【符号の説明】
１ ＤＰＦ装置
２ 触媒側シェル
２１ 拡散チャンバ
２２ 触媒側フランジ
２３ 拡径部
２４ センサ取付けボス
２５ 酸化触媒
２６ 触媒保持マット
２７ 前方接続フランジ
３ フィルタ側シェル
３１ フィルタ側前方フランジ
３２ フィルタ側後方フランジ
３３ パティキュレートフィルタ
３４ フィルタ保持マット
４ 後方シェル
４１ 縮流チャンバ
４２ 後方接続フランジ
４３ 後方シェル側フランジ
４４ 後方拡径部
６ 温度センサ
７ ボルトナット[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of a diesel particulate filter device that collects and processes particulate matter (PM) contained in exhaust gas from a diesel engine or the like.
[0002]
[Prior art]
A conventional diesel particulate filter device is provided with a catalyst on the upstream side inside the device, a filter on the downstream side, a temperature sensor between the catalyst and the filter, and knows the state of the exhaust temperature at this position to detect exhaust gas. It is used for control for reducing particulates in the inside (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP 2001-73748 A (pages 7-8, FIG. 5)
[0004]
[Problems to be solved by the invention]
Such a conventional diesel particulate filter device often has the following structure.
A cylindrical shell is divided into at least two parts, a catalyst is provided inside one, a filter is provided inside one, an annular flange is provided on the outer periphery of the shell end surface part of each divided part, and the flange surfaces are combined at a plurality of locations. The sensor mounting boss is provided on one shell, and the temperature sensor is mounted on the sensor mounting boss so that the sensor portion of the temperature sensor can be inserted between the catalyst and the filter inside the shell.
As a necessity of adopting such a structure, when a diesel particulate filter device is mounted on a vehicle and used, ash such as engine oil accumulates on the filter, so that it is necessary to be able to clean from the filter end. This is because that.
[0005]
However, in such a structure, the mounting boss of the control sensor (temperature sensor) is welded between the oxidation catalyst and the splitting flange, so that the space for welding the mounting boss and the splitting flange are equivalent to the catalyst and the filter. Had left.
When the catalyst and the filter are separated from each other, the surface area of the container between the catalyst and the filter is increased, and the temperature of the exhaust gas flowing toward the filter is lowered due to heat radiation from the container to the outside.
Further, when the amount of heat radiation to the outside increases, heat damage has become a problem at the outer periphery and the like.
Moreover, in such a structure, the full length of the container became long and the vehicle mounting property was worsened.
[0006]
On the other hand, if the structure in which the filter or catalyst protrudes from the shell end face has strength problems, the mounting difficulty becomes high, and the outer periphery of the protruding portion cannot be covered with the holding material, so there is a high risk of damage. It was something that would end up.
[0007]
The present invention has been made paying attention to the above-mentioned problems, and the object of the present invention is to reduce the temperature drop of the exhaust gas between the catalyst and the filter and to improve the safety by reducing the heat damage to the surroundings. It is possible to provide a diesel particulate filter device capable of improving the vehicle mountability.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, an oxidation catalyst is provided on the upstream side of a cylindrical container body connected in the middle of an engine exhaust system so that particulate matter in the exhaust gas can be easily reburned. In a diesel particulate filter device provided with a filter that collects particulate matter in exhaust gas and reburns it with exhaust gas on the downstream side, and an exhaust sensor that detects the state of exhaust gas between the oxidation catalyst and the filter, After the container body is divided into at least two parts, the catalyst side shell and the filter side shell, the rear end of the catalyst side shell is extended rearward from the rear end of the catalyst and the enlarged diameter rear end is provided, and the annular flange is enlarged. Provided on the outer periphery of the rear end of the end, the mounting part of the control sensor is provided on the outer periphery of the rear end of the enlarged diameter in front of the flange, and the flange in contact with the flange of the rear end of the enlarged diameter is the front end of the filter-side shell Ri provided behind the outer periphery, the front end portion of the filter-side shell and a means, characterized in that the structure for fastening the fitted flanges to insert into the interior of the enlarged diameter rear end portion of the catalyst-side shell.
[0009]
[Operation and effect of the invention]
In the first aspect of the invention, the filter-side shell is fitted so as to be inserted into the inside end of the diameter-expanded portion of the catalyst-side shell. Thereby, the distance between the oxidation catalyst and the filter can be reduced. Therefore, the surface area portion of the catalyst side shell located between the oxidation catalyst and the filter is reduced. Therefore, the heat radiation area is reduced, and the temperature drop of the exhaust gas between the oxidation catalyst and the filter can be reduced.
In addition, reducing heat radiation can reduce the heat damage to the periphery and reduce the distance from the peripheral devices, thereby improving vehicle mountability.
In addition, the overall length of the apparatus can be shortened by bringing the oxidation catalyst and the filter closer to each other, and the vehicle mountability can be further improved.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment for realizing a diesel particulate filter device of the present invention will be described based on an embodiment corresponding to the invention according to claim 1.
[0011]
(Example)
[0012]
First, the configuration will be described.
FIG. 1 is a sectional view showing a diesel particulate filter device according to an embodiment. The main symbols in FIG. 1 will be described. 1 is a DPF device (diesel particulate filter device), 2 is a catalyst side shell (which constitutes a container body with 3, 4), 21 is a diffusion chamber, 22 is a catalyst side flange, 23 Is an enlarged diameter portion (rear end portion of the enlarged diameter), 24 is a sensor mounting boss (control sensor mounting portion), 25 is an oxidation catalyst, 26 is a catalyst holding mat, 27 is a front connection flange, 3 is a filter side shell, 31 Is a filter side front flange, 32 is a filter side rear flange, 33 is a particulate filter (filter), 34 is a filter holding mat, 4 is a rear shell, 41 is a contraction chamber, 42 is a rear connection flange, and 43 is a rear shell side. A flange, 44 is a rear enlarged diameter portion, 6 is a temperature sensor (control sensor), and 7 is a bolt and nut.
[0013]
As shown in FIG. 1, the DPF device 1 according to the present embodiment is roughly divided into three parts, and is composed of three parts: a catalyst side shell 2, a filter side shell 3, and a rear shell 4.
First, the catalyst side shell 2 has a front end portion with a reduced diameter and is provided with a front connection flange 27 for connection to the exhaust system. In the front inside of the catalyst side shell 2, there is a flow toward the oxidation catalyst 25 by changing the direction of the flow by passing the exhaust gas taken in the inside through a small hole provided in a pipe or a plate-like object or expanding and contracting the passage. A diffusion chamber 21 is provided to make the flow uniform at the center and the outer peripheral side, and to muffle the exhaust gas discharge sound from the engine.
[0014]
Behind the diffusion chamber 21 inside the catalyst side shell 2, an exhaust gas is purified while passing the exhaust gas, and an oxidation catalyst 25 that generates soot oxide ions so that the soot can be easily reburned by a filter is provided on the outer periphery. The holding mat 26 is wound and provided inside the catalyst side shell 2.
The rear end of the catalyst side shell 2 is provided with a diameter-expanding portion 23 that has a shape that increases the diameter behind the rear end of the oxidation catalyst 25. A catalyst-side flange 22 projecting annularly is provided on the outer periphery of the rear end of the enlarged diameter portion 23. Further, on the outer periphery of the enlarged diameter portion 23 in front of the catalyst side flange 22, there is provided a sensor mounting boss 24 having a hole communicating with the inside of the catalyst side shell 2 and attaching the temperature sensor 6.
[0015]
Next, a filter-side front flange 31 projecting annularly from the front end of the outer periphery of the filter-side shell 3 to a rear position by a predetermined distance is provided. Further, a filter-side rear flange 32 is provided at a position a predetermined distance forward from the outer peripheral rear end.
A particulate filter 33 that collects the soot contained in the exhaust gas and regenerates the filter by re-burning the collected soot so that the front end and the front end of the filter-side shell 3 are substantially the same as the outer filter. The holding mat 34 is wound around and provided inside the filter-side shell 3.
[0016]
Next, the rear shell 4 is provided, which includes a contracted flow chamber 41 for smoothly flowing the flow of the filter outlet from the rear connection flange 42 to the rear exhaust pipe and for silencing. At the front end of the rear shell 4, an enlarged rear enlarged diameter portion 44 is provided, and at the outer periphery of the front end of the rear enlarged diameter portion 44, a rear shell side flange 43 projecting in an annular shape is provided.
[0017]
When assembling the catalyst side shell 2, the filter side shell 3, and the rear shell 4, first, the front end of the filter side shell 3 is inserted into the enlarged diameter portion 23 at the rear end of the catalyst side shell 2. Let This fitting is performed up to a position where the catalyst side flange 22 and the filter side front flange 31 of the enlarged diameter portion 23 are in contact with each other. Next, in a state where the catalyst side flange 22 and the filter side front flange 31 are in contact with each other, a plurality of locations are fastened by the bolts and nuts 7.
[0018]
When the catalyst side shell 2 and the filter side shell 3 are attached in this way, the rear end of the filter side shell 3 is inserted and fitted into the rear enlarged diameter portion 44 of the rear shell 4. This fitting is performed until the rear shell side flange 43 and the filter side rear flange 32 of the rear enlarged diameter portion 44 come into contact with each other, and the rear shell side flange 43 and the filter side rear flange 32 are fastened and attached by the bolt nut 7.
[0019]
Further, in order to regenerate the soot when the soot accumulates on the sensor mounting boss 24 of the enlarged diameter portion 23 of the catalyst side shell 2, a temperature sensor 6 is fed back to the computer unit on the engine side to feed back the exhaust state. The mounting boss 24 is passed through and mounted so as to be positioned between the catalyst and the filter.
[0020]
Next, the operation will be described.
[Exhaust temperature drop prevention]
In this embodiment, as shown in FIG. 1, the filter-side shell 3 is fitted so as to be inserted into the enlarged diameter portion 23 of the catalyst-side shell 2, whereby the positions of the oxidation catalyst 25 and the particulate filter 33 are compared with the conventional one. Can be closer. Then, the surface area of the catalyst-side shell 2 between the oxidation catalyst 25 and the particulate filter 33 is reduced, and the heat radiation amount is reduced, so that the temperature drop of the exhaust gas is reduced.
[0021]
[Reduction of heat damage to the surrounding area]
Making the oxidation catalyst 25 and the particulate filter 33 close to each other to reduce the heat radiation amount of the catalyst side shell 2 reduces heat damage that causes peripheral devices to be deformed / failed by heat.
[0022]
[Vehicle mountability improvement effect]
The filter side shell 3 has a structure in which the front end is inserted into the enlarged diameter portion 23 of the catalyst side shell 2 and the rear end is inserted into the rear enlarged diameter portion 44 of the rear shell 4. The overall length can be shortened, and the mountability to the vehicle is improved.
Further, since the amount of heat released from the catalyst side shell 2 is reduced to reduce the heat damage to the peripheral devices, the distance from the peripheral devices can be reduced accordingly, and the mountability to the vehicle is further improved.
[0023]
Next, the effect will be described.
[0024]
In the diesel particulate filter device of the embodiment, the effects listed below can be obtained.
[0025]
(1) An oxidation catalyst 25 is provided on the upstream side of the cylindrical container body connected in the middle of the exhaust system of the engine so that the particulate matter in the exhaust gas can be easily reburned, and the particulate matter in the exhaust gas is provided on the downstream side. In the DPF device 1 in which the particulate filter 33 for collecting and re-combusting with exhaust gas is provided, and the temperature sensor 6 for detecting the state of the exhaust gas is provided between the oxidation catalyst 25 and the filter, the container body is connected to the catalyst side shell 2 and the filter. The side shell 3 and the rear shell 4 are divided, the rear end of the catalyst side shell 2 is extended rearward from the rear end of the oxidation catalyst 25, and the diameter-increased portion 23 is provided. 23 is provided on the outer periphery of the rear end portion, the sensor mounting boss 24 is provided on the outer periphery of the enlarged-diameter portion 23 in front of the catalyst-side flange 22, and the filter-side front flange 31 that is in contact with the catalyst-side flange 22 of the enlarged-diameter portion 23 Since the front end of the filter side shell 3 is provided on the outer periphery behind the front end of the filter side shell 3, and the front end of the filter side shell 3 is fitted into the enlarged diameter portion 23 of the catalyst side shell 2 to fasten both flanges. The temperature drop of the exhaust gas between the catalyst 25 and the particulate filter 33 can be reduced, the heat damage to the surroundings can be reduced, the safety can be improved, and the vehicle mountability can be improved.
[0026]
As mentioned above, although the diesel particulate filter device of the present invention has been described based on the embodiments, the specific configuration is not limited to these embodiments, and the invention according to each claim of the claims. Design changes and additions are allowed without departing from the gist.
For example, in the embodiment, the container main body is configured by the catalyst side shell, the filter side shell, and the rear shell, but may be configured by the catalyst side shell and the rear shell, or may be another configuration.
In the embodiment, the temperature sensor is used as the control sensor. However, another sensor such as an O 2 sensor may be used and may be determined according to the control method.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a diesel particulate filter device according to an embodiment.
FIG. 2 is a partially enlarged sectional view showing a conventional diesel particulate filter device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 DPF apparatus 2 Catalyst side shell 21 Diffusion chamber 22 Catalyst side flange 23 Diameter expansion part 24 Sensor mounting boss 25 Oxidation catalyst 26 Catalyst holding mat 27 Front connection flange 3 Filter side shell 31 Filter side front flange 32 Filter side rear flange 33 Particulate Filter 34 Filter holding mat 4 Rear shell 41 Shrinking chamber 42 Rear connection flange 43 Rear shell side flange 44 Rear expanded portion 6 Temperature sensor 7 Bolt nut

Claims (1)

エンジンの排気系の途中に接続する筒状の容器本体内の上流側に排気中の微粒子物質を再燃焼しやすい状態にする酸化触媒を設け、下流側に排気中の微粒子物質を捕集して排気で再燃焼させるフィルタを設け、前記酸化触媒とフィルタの間に排気の状態を検知する排気用センサを設けたディーゼルパティキュレートフィルタ装置において、
前記容器本体を触媒側シェルとフィルタ側シェルに少なくとも２分割にし、前記触媒側シェルの後端を触媒後端より後方に延長するとともに拡径した拡径後端部を設け、環状のフランジを前記拡径後端部の後端部の外周に設け、前記制御用センサの取付部を前記フランジより前方の前記拡径後端部の外周に設け、前記拡径後端部のフランジと面接するフランジを前記フィルタ側シェルの前端より後方の外周に設け、フィルタ側シェルの前端部を触媒側シェルの拡径後端部の内部に挿入するよう嵌合して両フランジを締結する構造にしたことを特徴とするディーゼルパティキュレートフィルタ装置。An oxidation catalyst is installed on the upstream side of the cylindrical container body that is connected in the middle of the exhaust system of the engine to make the particulate matter in the exhaust easy to reburn, and the particulate matter in the exhaust is collected downstream. In a diesel particulate filter device provided with a filter for reburning with exhaust, and provided with an exhaust sensor for detecting the state of exhaust between the oxidation catalyst and the filter,
The container main body is divided into at least two parts: a catalyst side shell and a filter side shell, a rear end of the catalyst side shell is extended rearward from the catalyst rear end and an enlarged diameter rear end is provided, and an annular flange is provided A flange that is provided on the outer periphery of the rear end portion of the diameter-enlarged rear end portion, the mounting portion of the control sensor is provided on the outer periphery of the diameter-enlarged rear end portion in front of the flange, and is in contact with the flange of the diameter-enlarged rear end portion Is provided on the outer periphery behind the front end of the filter side shell, and the front end portion of the filter side shell is fitted into the inside of the enlarged diameter rear end portion of the catalyst side shell to fasten both flanges. A characteristic diesel particulate filter device.
JP2003052872A 2003-02-28 2003-02-28 Diesel particulate filter device Expired - Fee Related JP4202787B2 (en)

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