JP2006142259A - Catalytic converter - Google Patents

Catalytic converter Download PDF

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Publication number
JP2006142259A
JP2006142259A JP2004338822A JP2004338822A JP2006142259A JP 2006142259 A JP2006142259 A JP 2006142259A JP 2004338822 A JP2004338822 A JP 2004338822A JP 2004338822 A JP2004338822 A JP 2004338822A JP 2006142259 A JP2006142259 A JP 2006142259A
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catalyst carrier
exhaust gas
catalytic converter
end portion
diffuser
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Japanese (ja)
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Shunsuke Moritsugu
俊介 森次
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Marelli Corp
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Calsonic Kansei Corp
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Priority to JP2004338822A priority Critical patent/JP2006142259A/en
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  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a catalytic converter which can improve exhaust gas purifying performance of a catalyst carrier by approximately uniformizing distribution of the exhaust gas hitting on the catalyst carrier. <P>SOLUTION: In the catalytic converter 1, a diffuser section 4 which is constituted by being integrated with an outer case 3 or by being separated from it is provided at an upstream side end portion of the outer case 3 in which the catalyst carrier 2 is accommodated and an assembly section 6d of an exhaust manifold 6 is joined to an upstream side end portion of the diffuser section 4. Further, a cylindrical intermediary member 5 is provided inside the upstream side end portion 4a of the diffuser section 4 in a close contact state and a resistance section 5d which is bent inside so that distribution of the exhaust gas hitting on the catalyst carrier 2 is approximately uniformized, is formed at a downstream side end portion 5c of the intermediary member 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は自動車の排気ガスを浄化するために排気管の途中に介装される触媒コンバータに関する。   The present invention relates to a catalytic converter interposed in the middle of an exhaust pipe in order to purify automobile exhaust gas.

従来、触媒コンバータは、エキゾーストマニホールドの集合部に接続される金属製の外筒内にメタル担体またはセラミック担体と称される触媒担体が収装されており、エンジンからエキゾーストマニホールドを介して流れる排気ガスが触媒担体を通過する際に触媒作用を受けて浄化されるようになっている（特許文献１参照）。
特開２００２−１０６３３５号公報 Conventionally, in a catalytic converter, a catalyst carrier called a metal carrier or a ceramic carrier is housed in a metal outer cylinder connected to a collecting portion of the exhaust manifold, and exhaust gas flowing from the engine through the exhaust manifold. When the catalyst passes through the catalyst carrier, it is purified by receiving a catalytic action (see Patent Document 1).
JP 2002-106335 A

しかしながら、前述した触媒コンバータにおいては、触媒担体に当たる排気ガスの分布に偏りが生じて触媒担体の排気ガス浄化性能を所望のように発揮できないという問題点があった。
なお、このような問題はエキゾーストマニホールドの集合部と触媒担体の中心軸が搭載レイアウトの関係からオフセットした場合に特に生じやすい。 However, the above-described catalytic converter has a problem in that the distribution of exhaust gas impinging on the catalyst carrier is biased and the exhaust gas purification performance of the catalyst carrier cannot be exhibited as desired.
Such a problem is particularly likely to occur when the aggregate portion of the exhaust manifold and the central axis of the catalyst carrier are offset from the mounting layout.

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、触媒担体に当たる排気ガスの分布を略均一にすることにより、触媒担体の排気ガス浄化性能を向上できる触媒コンバータを提供することである。   The present invention has been made paying attention to the above problems, and its object is to provide a catalytic converter capable of improving the exhaust gas purification performance of the catalyst carrier by making the distribution of the exhaust gas striking the catalyst carrier substantially uniform. Is to provide.

本発明の請求項１記載の発明では、触媒担体が収装された外筒の上流側端部に、該外筒と一体または別体で構成されるディフューザ部が設けられると共に、該ディフューザ部の上流側端部にエキゾーストマニホールドの集合部が接続される触媒コンバータにおいて、前記ディフューザ部の上流側端部内側に円筒形状の介装部材を密着した状態で設けると共に、該介装部材に触媒担体に当たる排気ガスの分布を略均一にするように内側へ突出する抵抗部を形成したことを特徴とする。   In the invention according to claim 1 of the present invention, a diffuser portion formed integrally or separately from the outer cylinder is provided at the upstream end of the outer cylinder in which the catalyst carrier is accommodated. In the catalytic converter in which the exhaust manifold assembly is connected to the upstream end, a cylindrical interposition member is provided in close contact with the upstream end of the diffuser, and the interposition member contacts the catalyst carrier. A resistance portion protruding inward is formed so as to make the distribution of the exhaust gas substantially uniform.

請求項１記載の発明にあっては、外筒の排気ガス上流側における端部内側に、円筒形状の介装部材を密着した状態で設けると共に、該介装部材に、触媒担体に当たる排気ガスの分布を略均一にするように内側へ突出する抵抗部を形成したため、触媒担体に当たる排気ガスの分布を略均一にでき、触媒担体の排気ガス浄化性能を向上できる。   In the first aspect of the present invention, a cylindrical interposed member is provided in close contact with the inner end of the outer cylinder on the upstream side of the exhaust gas, and the exhaust gas that hits the catalyst carrier is disposed on the interposed member. Since the resistance portion protruding inward so as to make the distribution substantially uniform is formed, the distribution of the exhaust gas hitting the catalyst carrier can be made substantially uniform, and the exhaust gas purification performance of the catalyst carrier can be improved.

以下、本発明の触媒コンバータの実施例を説明する。   Examples of the catalytic converter of the present invention will be described below.

以下、実施例１を説明する。
図１は本発明の実施例１の触媒コンバータを示す全体図、図２は本実施例の触媒コンバータの要部拡大断面図、図３は介装部材の正面図、図４は同側面図、図５は同上面図、図６は同底面図である。 Example 1 will be described below.
1 is an overall view showing a catalytic converter according to a first embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a main part of the catalytic converter of the present embodiment, FIG. 3 is a front view of an interposed member, and FIG. 5 is a top view thereof, and FIG. 6 is a bottom view thereof.

先ず、全体構成を説明する。
図１、２に示すように、本実施例１の触媒コンバータ１は、触媒担体２と、外筒３と、ディフューザ部４と、介装部材５を備え、エキゾーストマニホールド６の集合部６ｄと、図外のマフラーに接続された下流側の排気管７との間に介装されている。 First, the overall configuration will be described.
As shown in FIGS. 1 and 2, the catalytic converter 1 of the first embodiment includes a catalyst carrier 2, an outer cylinder 3, a diffuser portion 4, and an interposition member 5, and a collective portion 6 d of the exhaust manifold 6; It is interposed between the exhaust pipe 7 on the downstream side connected to a muffler (not shown).

前記触媒担体２はステンレス箔の平板と波板、或いは大波板と小波板とを組み合わせて多層に巻回して構成された所謂メタル担体であり、アルミまたはステンレス等の金属製の外筒３内に設けられている。
また、前記触媒担体２と外筒３とは、図外の加熱炉で熱処理されて各部が拡散接合されている他、触媒担体２には白金等の触媒が担持されている。 The catalyst carrier 2 is a so-called metal carrier constructed by winding a stainless foil flat plate and corrugated plate, or a combination of a large corrugated plate and a small corrugated plate, and is wound inside a metal outer cylinder 3 such as aluminum or stainless steel. Is provided.
The catalyst carrier 2 and the outer cylinder 3 are heat-treated in a heating furnace (not shown) to be diffusion-bonded, and the catalyst carrier 2 carries a catalyst such as platinum.

前記外筒３の上流側外周には、後述するディフューザ部４の下流側端部４ｂが重ねられた状態で溶接Ｘ１で固定され、一方、外筒３の下流側外周には、排気管７の上流側端部７ａが重ねられた状態で溶接Ｘ２で固定されている。   A downstream end 4b of a diffuser portion 4 to be described later is fixed to the outer periphery on the upstream side of the outer cylinder 3 by welding X1, while the exhaust pipe 7 The upstream end portion 7a is fixed by welding X2 in a state of being overlapped.

前記ディフューザ部４は、金属製で円筒形状に形成される他、その下流側端部４ｂの内径は外筒３の外径と略同一の径に形成され、その上流側端部４ａの内径は後述する介装部材５の外径と略同一の径に形成されている。
また、ディフューザ部４は触媒担体２と後述する集合部６ｄの搭載レイアウトの関係からその両端部の中心軸O1,O2をオフセットするように一体絞り加工されている。 The diffuser portion 4 is made of a metal and is formed in a cylindrical shape, and the inner diameter of the downstream end portion 4b is substantially the same as the outer diameter of the outer tube 3, and the inner diameter of the upstream end portion 4a is It is formed in the diameter substantially the same as the outer diameter of the intervention member 5 mentioned later.
Further, the diffuser portion 4 is integrally drawn so as to offset the central axes O1 and O2 at both ends of the catalyst carrier 2 and the mounting layout of the collective portion 6d described later.

また、前記ディフューザ部４の上流側端部４ａ内側には、図３〜６に示す金属製で円筒形状の介装部材５が密着した状態で設けられている。
具体的には、前記介装部材５の上流側端部５ａには、その全周に亘って外側に折り曲げられた係止部５ｂが形成されると共に、該係止部５ｂがディフューザ部４の上流側端部４ａに係止して両者が位置決めされた状態でスポット溶接Ｓにより数箇所で固定されている。
また、前記介装部材５の下流側端部５ｃには、後述する触媒担体２に当たる排気ガスの分布を略均一にするように内側へ折り曲げられた抵抗部５ｄが形成されている。 In addition, a metallic and cylindrical interposing member 5 shown in FIGS. 3 to 6 is provided inside the upstream end portion 4a of the diffuser portion 4 so as to be in close contact therewith.
Specifically, the upstream end portion 5 a of the intervention member 5 is formed with a locking portion 5 b that is bent outward over the entire circumference, and the locking portion 5 b is formed on the diffuser portion 4. It is fixed at several points by spot welding S in a state where both are positioned by being locked to the upstream end 4a.
Further, the downstream end portion 5c of the interposed member 5 is formed with a resistance portion 5d bent inward so as to make the distribution of exhaust gas striking the catalyst carrier 2 described later substantially uniform.

前記エキゾーストマニホールド６は、図外のエンジンの排気ポートにヘッドフランジを介して接続された複数の排気管６ａ〜６ｃと、これらの排気管６ａ〜６ｃを１本に集合した状態で収装する集合部６ｄで構成され、該集合部６ｄとディフューザ部４及び介装部材５とは、互いに重ねられた状態で図外のフランジにより固定される。   The exhaust manifold 6 includes a plurality of exhaust pipes 6a to 6c connected to an exhaust port of an engine (not shown) via a head flange, and a set in which these exhaust pipes 6a to 6c are gathered into one. It is comprised by the part 6d, and this collective part 6d, the diffuser part 4, and the interposition member 5 are fixed by the flange outside a figure in the state piled up mutually.

次に、作用を説明する。
このように構成された触媒コンバータにあっては、エンジンの各排気ポートから排出された排気ガスは、エキゾーストマニホールド６の排気管６ａ〜６ｃ、集合部６ｄ、ディフューザ部４を介して外筒３内の触媒担体２の前面から流入して排気管７側へ通過する間に、排気ガス中のＨＣ、ＣＯ、Ｎｏｘが触媒と反応してＨ２Ｏ、ＣＯ２、Ｎ２に浄化された後、図外のメインマフラ等に排出される。 Next, the operation will be described.
In the catalytic converter configured as described above, the exhaust gas discharged from each exhaust port of the engine passes through the exhaust pipes 6 a to 6 c of the exhaust manifold 6, the collecting portion 6 d, and the diffuser portion 4 to the inside of the outer cylinder 3. After flowing from the front surface of the catalyst carrier 2 and passing to the exhaust pipe 7 side, HC, CO, Nox in the exhaust gas reacts with the catalyst and is purified to H 2 O, CO 2 , N 2 , It is discharged to the main muffler etc. outside the figure.

この際、集合部６ｄからディフューザ部４に流入する排ガスは、その流通断面積を拡大しながら、換言すると、外側へ拡散しながら触媒担体２の前面に流入するが、複数の排気管６ａ〜６ｃの配置によって触媒担体２に当たる排気ガスの分布が均一にならず、触媒担体２の浄化性能や耐久性に悪影響が生じる。   At this time, the exhaust gas flowing into the diffuser portion 4 from the collecting portion 6d flows into the front surface of the catalyst carrier 2 while expanding its flow cross-sectional area, in other words, while diffusing outward, but a plurality of exhaust pipes 6a to 6c. With this arrangement, the distribution of the exhaust gas hitting the catalyst carrier 2 is not uniform, and the purification performance and durability of the catalyst carrier 2 are adversely affected.

また、本実施例１のディフューザ部４は、集合部６ｄと触媒担体２の搭載レイアウトの関係によって両端部の中心軸O1,O2をオフセットするように一体絞り加工されているため、触媒担体２に当たる排気ガスは中心軸Ｏ２に近い部位に集中し易い。   In addition, the diffuser portion 4 of the first embodiment hits the catalyst carrier 2 because it is integrally drawn so as to offset the central axes O1 and O2 at both ends depending on the mounting layout of the collecting portion 6d and the catalyst carrier 2. The exhaust gas tends to concentrate on a portion close to the central axis O2.

しかしながら、本実施例２の触媒コンバータにあっては、集合部６ｄからディフューザ部４に流入した排気ガスの一部が、図２の破線矢印Ａで示すように、抵抗部５ｄに当たって乱流化して排気ガスの流れを中心軸Ｏ１側に変化させることができ、これにより、触媒担体２に当たる排気ガスの分布を略均一できる。   However, in the catalytic converter of the second embodiment, a part of the exhaust gas flowing into the diffuser portion 4 from the collecting portion 6d hits the resistance portion 5d and becomes turbulent as shown by the broken line arrow A in FIG. The flow of the exhaust gas can be changed to the central axis O1 side, so that the distribution of the exhaust gas hitting the catalyst carrier 2 can be made substantially uniform.

次に、効果を説明する。
以上、説明したように、本実施例の触媒コンバータにあっては、ディフューザ部４の上流側端部４ａ内側に円筒形状の介装部材５を密着した状態で設けると共に、該介装部材５に触媒担体２に当たる排気ガスの分布を略均一にするように内側へ突出する抵抗部５ｄを形成したため、触媒担体２に当たる排気ガスの分布を略均一にでき、触媒担体２の排気ガス浄化性能を向上できる。 Next, the effect will be described.
As described above, in the catalytic converter of the present embodiment, the cylindrical interposed member 5 is provided in close contact with the upstream end 4a of the diffuser portion 4, and the interposed member 5 Since the resistance portion 5d protruding inward so as to make the distribution of the exhaust gas hitting the catalyst carrier 2 substantially uniform, the distribution of the exhaust gas hitting the catalyst carrier 2 can be made substantially uniform, and the exhaust gas purification performance of the catalyst carrier 2 is improved. it can.

また、介装部材５の上流側端部５ａに外側へ折り曲げられた係止部５ｂを形成すると共に、該係止部５ｂをディフューザ部４の上流側端部４ａに係止させることにより両者を位置決めした状態でスポット溶接Ｓで固定したため、両者を組付ける際に抵抗部５ｄの位置決めを容易に行える。
また、スポット溶接Ｓが何らかの原因で切断した場合でも介装部材５が脱落する虞がない。 In addition, an engaging portion 5b bent outward is formed at the upstream end portion 5a of the interposing member 5, and the engaging portion 5b is engaged with the upstream end portion 4a of the diffuser portion 4 so that the both are connected. Since it is fixed by spot welding S in the positioned state, the positioning of the resistance portion 5d can be easily performed when both are assembled.
Further, even when the spot welding S is cut for some reason, there is no possibility that the interposition member 5 falls off.

さらに、ディフューザ部４の上流側端部４ａは一体絞り加工で成形される関係上、その肉厚が他の部位に比べて薄く形成されるが、該上流側端部４ａ内側には介装部材５が密着して設けられるため、ディフューザ部４を補剛できる。   Further, the upstream end 4a of the diffuser portion 4 is formed by integral drawing, so that its thickness is thinner than other parts, but there is an intervening member inside the upstream end 4a. Since 5 is closely attached, the diffuser portion 4 can be stiffened.

以上、本発明の実施例を説明してきたが、本発明の具体的構成は本実施例に限定されるものではなく、発明の要旨を逸脱しない範囲の設計変更などがあっても本発明に含まれる。
例えば、本実施例１では、ディフューザ部４と外筒３が別体で構成された場合について説明したが、これら両者は一体的に形成しても良い。 Although the embodiments of the present invention have been described above, the specific configuration of the present invention is not limited to the embodiments, and the present invention includes any design changes that do not depart from the gist of the invention. It is.
For example, although the present Example 1 demonstrated the case where the diffuser part 4 and the outer cylinder 3 were comprised separately, these both may be formed integrally.

また、抵抗部５ｄの形状、設置数、設置位置については適宜設定できる。
抵抗部５ｄの形状については、図７に示すような介装部材５の下流側端部５ｃを山型形状に折り返した抵抗部１０や、図８に示すような介装部材５の中途部の一部を切り起こし成形した抵抗部１１が考えられるが、エンボス加工して凹凸状に形成したものや丸みを帯びた形状のものは排気ガスの乱流化を期待できないため、あまり好ましくない。 In addition, the shape, the number of installations, and the installation position of the resistance portion 5d can be set as appropriate.
About the shape of the resistance part 5d, the downstream end part 5c of the interposed member 5 as shown in FIG. 7 is folded back into a mountain shape, or the intermediate part of the interposed member 5 as shown in FIG. A resistance part 11 formed by cutting and raising a part is conceivable. However, an embossed and formed in a concavo-convex shape or a rounded shape is not preferable because turbulent exhaust gas cannot be expected.

本発明の実施例の触媒コンバータを示す全体図である。1 is an overall view showing a catalytic converter according to an embodiment of the present invention. 本実施例１の触媒コンバータの要部拡大断面図である。FIG. 3 is an enlarged cross-sectional view of a main part of the catalytic converter of Example 1. 介装部材の正面図である。It is a front view of an intervention member. 介装部材の右側面図である。It is a right view of an intervention member. 介装部材の上面図である。It is a top view of an intervention member. 介装部材の底面図である。It is a bottom view of an intervention member. その他の実施例の介装部材を説明する図である。It is a figure explaining the intervention member of other Examples. その他の実施例の介装部材を説明する図である。It is a figure explaining the intervention member of other Examples.

符号の説明Explanation of symbols

Ｓ スポット溶接
Ｘ１、Ｘ２ 溶接
１ 触媒コンバータ
２ 触媒担体
３ 外筒
４ ディフューザ部
４ａ、５ａ、７ａ 上流側端部
４ｂ、５ｃ 下流側端部
５ 介装部材
５ｂ 係止部
５ｄ 抵抗部
６ エキゾーストマニホールド
６ａ、６ｂ、６ｃ 排気管
６ｄ 集合部
７ 排気管 S spot welding X1, X2 welding 1 catalytic converter 2 catalyst carrier 3 outer cylinder 4 diffuser part 4a, 5a, 7a upstream end part 4b, 5c downstream end part 5 interposition member 5b locking part 5d resistance part 6 exhaust manifold 6a , 6b, 6c Exhaust pipe 6d Collecting part 7 Exhaust pipe

Claims (1)

触媒担体が収装された外筒の上流側端部に、該外筒と一体または別体で構成されるディフューザ部が設けられると共に、該ディフューザ部の上流側端部にエキゾーストマニホールドの集合部が接続される触媒コンバータにおいて、
前記ディフューザ部の上流側端部内側に円筒形状の介装部材を密着した状態で設けると共に、該介装部材に触媒担体に当たる排気ガスの分布を略均一にするように内側へ突出する抵抗部を形成したことを特徴とする触媒コンバータ。 A diffuser part configured integrally or separately from the outer cylinder is provided at the upstream end of the outer cylinder in which the catalyst carrier is accommodated, and an exhaust manifold assembly is provided at the upstream end of the diffuser part. In the connected catalytic converter,
A cylindrical interposition member is provided in close contact with the inside of the upstream end of the diffuser portion, and a resistance portion that protrudes inward so as to make the distribution of exhaust gas striking the catalyst carrier substantially uniform on the interposition member A catalytic converter characterized by being formed.
JP2004338822A 2004-11-24 2004-11-24 Catalytic converter Pending JP2006142259A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014129014A1 (en) * 2013-02-20 2014-08-28 本田技研工業株式会社 Exhaust purification device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014129014A1 (en) * 2013-02-20 2014-08-28 本田技研工業株式会社 Exhaust purification device
JP5916940B2 (en) * 2013-02-20 2016-05-11 本田技研工業株式会社 Exhaust purification equipment
JPWO2014129014A1 (en) * 2013-02-20 2017-02-02 本田技研工業株式会社 Exhaust purification device

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