JP4225015B2 - Catalytic converter - Google Patents

Catalytic converter Download PDF

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Publication number
JP4225015B2
JP4225015B2 JP2002261608A JP2002261608A JP4225015B2 JP 4225015 B2 JP4225015 B2 JP 4225015B2 JP 2002261608 A JP2002261608 A JP 2002261608A JP 2002261608 A JP2002261608 A JP 2002261608A JP 4225015 B2 JP4225015 B2 JP 4225015B2
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Japan
Prior art keywords
inner cylinder
outer cylinder
cylinder
casing
catalytic converter
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JP2004100515A (en
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浩之 川久保
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Toyota Motor Corp
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Toyota Motor Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、内燃機関の排気系に設けられる触媒コンバータに関し、とくに熱膨張による、ケーシングの、触媒担体保持力の低下を少なくした触媒コンバータに関する。
【０００２】
【従来の技術】
【特許文献１】
特開２００１−１４７２３２号公報
【０００３】
内燃機関の排気ガス中の有害成分を除去する触媒コンバータにおいて、特開２００１−１４７２３２号公報に示されるように、触媒担体外周に保持マットを巻き付けて、ケーシング内に収容する構造は、知られている。
【０００４】
【発明が解決しようとする課題】
しかし、従来の触媒コンバータの構造では、ケーシングが１重でかつ周方向に連続構造になっているため、ケーシング内面が高温ガスに曝された時にケーシング全厚にわたって高温となり、ケーシングが比較的大きく熱膨張し、ケーシングの、触媒マットを介しての触媒担体保持力が低下し、触媒担体がケーシング内で位置ずれ、脱落などを生じるおそれがある。
本発明の目的は、ケーシングの、保持マットを介しての触媒担体保持力の低下を少なくした触媒コンバータを提供することにある。
【０００５】
【課題を解決するための手段】
上記目的を達成する本発明はつぎの通りである。
（１） 外周に保持マットを巻いた触媒担体をケーシングに収容した触媒コンバータにおいて、
前記ケーシングは内筒と外筒とを有し、前記内筒と外筒のうち少なくとも内筒は周方向に１箇所隙間を有し、前記外筒は前記内筒に溶着されており、前記内筒は前記外筒より厚さが大であることを特徴とする触媒コンバータ。
（２） 外周に保持マットを巻いた触媒担体をケーシングに収容した触媒コンバータにおいて、
前記ケーシングは内筒と外筒とを有し、前記内筒と外筒のうち少なくとも内筒は周方向に１箇所隙間を有し、前記外筒は前記内筒に溶着されており、前記外筒も周方向に１箇所隙間を有し、前記外筒は周方向両端部で前記内筒に溶着されていることを特徴とする触媒コンバータ。
（３） 前記外筒は周方向に少なくとも１箇所突部を有する請求項１または請求項２記載の触媒コンバータ。
【０００６】
上記（１）〜（３）の触媒コンバータでは、ケーシングを内筒、外筒の二重構成とし、少なくとも内筒を周方向に１箇所隙間をもつ構造とし、外筒を内筒に溶着したので、外筒は大気に触れて比較的低温であり熱膨張は比較的小さく、高温排気ガスに曝されて高温になる内筒が熱膨張しようとしても、比較的低温の外筒によって熱膨張変形が抑えられる。この場合、内筒が周方向に熱膨張しても、周方向の隙間の幅が小さくなるだけで、内筒の内径の膨張は抑えられる。その結果、内筒内径と、熱膨張が小さい触媒担体の外周とのスペースの厚さはほとんど変わらず、ケーシングの、保持マットを介しての触媒担体保持力の低下は少ない。
上記（１）の触媒コンバータでは、保持マットを介して触媒担体を保持するのは内筒であるから、内筒の厚さを外筒の厚さより大とすることにって、内筒の剛性を確保し、触媒担体保持力を確保してある。
上記（２）の触媒コンバータでは、外筒も周方向１箇所に隙間を有し、外筒がその周方向両端部で内筒に溶着されているので、触媒コンバータ内外のシールが確保される。
上記（３）の触媒コンバータでは、外筒が周方向に少なくとも１箇所突部を有するので、外筒が径方向に熱膨張せずに周方向に熱膨張しても、その周方向伸びを突部の幅の縮小で吸収できる。
【０００７】
【発明の実施の形態】
図１、図２は、本発明の一実施例の触媒コンバータ１を示している。
本発明の触媒コンバータ１は、内燃機関の排気ガス通路に配置され、触媒担体２と、触媒担体２に巻きつけられた保持マット３と、触媒担体２を保持マット３を介して保持するケーシング４とを、有する。
触媒担体２は、たとえばセラミックからなる、モノリス担体で、多数の微小断面積の排気ガス流路を有する（たとえば、ハニカム状）。触媒担体２は触媒成分を担持しており、内燃機関からの排気ガスが触媒担体２を流れる時、触媒成分に触れ、排気ガス中の有害成分が無害化される。
保持マット３は、たとえばアルミナ繊維のマットで、触媒担体２の外周に巻かれ、触媒担体２とケーシング４との間の環状スペースに圧縮されて配置され、触媒担体２を保持する。
【０００８】
ケーシング４は、金属製、たとえばステンレス製で、内部に、外周に保持マット３を巻いた触媒担体２を収容する。
ケーシング４は内側に外周に保持マット３を巻いた触媒担体２を収容する円筒部と、その上流側に接続され円筒部に近づくほど拡径する拡径部と、円筒部の下流側に接続され円筒部から離れるほど縮径する縮径部と、を有する。円筒部の断面は、望ましくは円形であるが、場合によっては断面が楕円形でもよい。
ケーシング４の円筒部は、内筒５と外筒６とを有し、一部で溶着された２部品構成となっている。外筒６は内筒５の外周に巻かれている。内筒５は外筒６より厚さが大である。組み付け前においては、内筒５は外筒６より大きな剛性を有している。
外筒６は内筒５に溶着部７で溶着されており、溶着部７以外では内筒５に接触しているだけで、内筒５に対してスライド可能である。
【０００９】
内筒５と外筒６のうち少なくとも内筒５は周方向に１箇所隙間８を有する。内筒５の隙間８は、触媒コンバータの軸方向に延びるスリットからなる。内筒５の隙間８はケーシング４の円筒部に形成されており、拡径部と縮径部には形成されていない。内筒５の隙間８の縁部では、内筒５は外筒６と溶着されていない。
外筒６も周方向に１箇所隙間９を有する。外筒６の隙間９は、触媒コンバータの軸方向に延びるスリットからなる。外筒６の隙間９はケーシング４の円筒部に形成されており、拡径部と縮径部には形成されていない。外筒６の隙間９は、内藤５の隙間８と、ケーシング４の円筒部の中心を中心として、互いに反対側にある。外筒６は外筒６の周方向両端部で、外筒６のスリットの縁部の全周にわたって、内筒５に溶着されており、この溶着部７はケーシング４の内部を外部からシールしている。
【００１０】
たとえば、内筒５が断面Ｃ字状の場合、外筒６は断面逆Ｃ字状で、内筒５の断面Ｃ字状の解放部と、外筒６の断面逆Ｃ字状の解放部とを互いに左右反対側にして、外筒６は、外筒６の断面逆Ｃ字状の解放部の端部で内筒５に溶接されており、シールされている。内筒５の断面Ｃ字状の解放部の縁部では、内筒５は外筒６に溶接されていない。
【００１１】
望ましくは、外筒６は、周方向に少なくとも１箇所、半径方向外方に突出する形状の、突部（山状の突起）１０を有する。図示例では隙間８の中心と隙間９の中心とを結ぶ直線を対称の中心線にして互いに対称となる位置に、２箇所、突部１０が設けられている。外筒６の径方向変形が拘束された条件下で、外筒６が周方向に熱膨張すると、突部１０の根元の幅が縮小することにより、凸部１０以外の外筒部分の周方向伸長を、吸収することができる。
突部１０は、ケーシング４の円筒部に形成されており、拡径部と縮径部には形成されていない。
【００１２】
つぎに、本発明の触媒コンバータ１の作用を説明する。
排気ガスが流れる前の常温の状態では、触媒コンバータ１のケーシング４は熱膨張しておらず、ケーシング４と触媒担体２との間の環状スペースは初期の一定厚みを有し、保持マット３の保持力は初期の保持力を維持している。
排気ガスが流れると、触媒コンバータ１も触媒担体２も高温になる。この場合、ケーシング４は、内面が排気ガスに曝される内筒５が、外面が大気に曝される外筒６より高温になる。たとえば、排気ガス温度が約９００℃とすると、触媒担体２は約９００℃、ケーシング４の内筒５は約８００℃、ケーシング４の外筒６は２００〜３００℃になるといった具合である。
熱膨張量は、セラミック製触媒担体２は金属製のケーシング４に比べてはるかに小さい。触媒コンバータ１が高温になった時に、熱膨張差によってセラミック製触媒担体２と金属製のケーシング４間の環状隙間の間隔が増大して触媒担体保持力が低下することを抑えるためには、触媒コンバータ１の温度が上がった時の、ケーシング４の径方向の熱膨張量を小さく抑えることが必要である。
【００１３】
本発明では、ケーシング４が２部品構成で、内筒５、外筒６の二重構成とし、少なくとも内筒５を周方向に１箇所隙間８をもつ構造とし、外筒６を内筒４に隙間８と反対側で溶着したので、外筒６は大気に触れて比較的低温であり熱膨張は比較的小さく、高温排気ガスに曝されて高温になる内筒５が熱膨張しようとしても、熱膨張の小の外筒６によって、内筒４の熱膨張変形が抑えられる。この場合、内筒５が周方向に熱膨張で伸長しても、周方向の隙間８の幅が小さくなるだけで、内筒５の内径の増大は抑えられる。その結果、内筒５内径と、熱膨張が小さい触媒担体２の外周とのスペースの厚さは初期とほとんど変わらず、したがって保持マット３の保持力はほとんど変わらず、ケーシング４の、保持マット３を介しての触媒担体２保持力の低下は少ない。
【００１４】
外筒６も周方向１箇所に隙間９を有し、外筒６がその周方向両端部で、すなわち隙間９の縁部で、内筒５に溶着されているので、内・外筒が固定が容易に固定され、かつ、触媒コンバータ１の内外間のシールも確保される。
また、保持マット３を介して触媒担体２を保持するのは内筒５であるから、内筒５の厚さを外筒６の厚さより大とすることにって、内筒６の剛性が確保され、触媒担体保持力が確保される。
【００１５】
また、外筒６が周方向に少なくとも１箇所突部１０を有するので、外筒６の径方向に熱膨張が拘束されて外筒６が径方向に熱膨張せずに周方向に熱膨張しても、その周方向伸びを突部１０の幅の縮小で吸収でき、ケーシング４の径を一定に保つことができる。そして、常に触媒担体２とケーシング４間のギャップを一定に保ち、保持マット３の発生面厚の低下を防ぐ。
【００１６】
【発明の効果】
請求項１〜３の触媒コンバータによれば、ケーシングを内筒、外筒の二重構成とし、少なくとも内筒を周方向に１箇所隙間をもつ構造とし、外筒を内筒に溶着したので、内筒が高温排気ガスに曝されて熱膨張しようとしても、比較的低温の外筒によって熱膨張変形が抑えられる。この場合、内筒が周方向に熱膨張しても、周方向の隙間の幅が小さくなるだけで、内筒の内径の膨張は抑えられる。その結果、内筒内径と、触媒担体の外周とのギャップの大きさはほとんど変わらず、ケーシングの、保持マットを介しての触媒担体保持力の低下は少ない。
請求項１の触媒コンバータによれば、内筒の厚さを外筒の厚さより大とすることにって、内筒の剛性を確保でき、触媒担体保持力を確保できる。
請求項２の触媒コンバータによれば、外筒も周方向１箇所に隙間を有し、外筒がその周方向両端部で内筒に溶着されるので、シールが確保される。
請求項３の触媒コンバータによれば、外筒が周方向に少なくとも１箇所突部を有するので、外筒が径方向に熱膨張せずに周方向に熱膨張しても、その周方向伸びを突部の幅の縮小で吸収できる。
【図面の簡単な説明】
【図１】 本発明の一実施例の触媒コンバータのケーシングの横断面図である。
【図２】 図１のＡ−Ａ線で見た触媒コンバータの縦断面図である。
【符号の説明】
１ 触媒コンバータ
２ 触媒担体
３ 保持マット
４ ケーシング
５ 内筒
６ 外筒
７ 溶着部
８、９ 隙間
１０ 突部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a catalytic converter provided in an exhaust system of an internal combustion engine, and more particularly to a catalytic converter in which a decrease in a catalyst carrier holding force of a casing due to thermal expansion is reduced.
[0002]
[Prior art]
[Patent Document 1]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2001-147232
In a catalytic converter for removing harmful components in exhaust gas of an internal combustion engine, a structure in which a holding mat is wound around the outer periphery of a catalyst carrier and accommodated in a casing is known, as disclosed in JP-A-2001-147232. Yes.
[0004]
[Problems to be solved by the invention]
However, in the structure of the conventional catalytic converter, the casing has a single layer and is continuous in the circumferential direction. Therefore, when the casing inner surface is exposed to high temperature gas, the casing becomes high temperature over the entire thickness, and the casing is heated relatively large. The expansion of the casing and the holding capacity of the catalyst carrier through the catalyst mat of the casing may be reduced, and the catalyst carrier may be displaced in the casing or fall off.
An object of the present invention is to provide a catalytic converter in which a decrease in the holding power of the catalyst carrier through the holding mat of the casing is reduced.
[0005]
[Means for Solving the Problems]
The present invention for achieving the above object is as follows.
( 1 ) In a catalytic converter in which a catalyst carrier having a holding mat wound around its outer periphery is housed in a casing,
The casing includes an inner cylinder and an outer cylinder, and at least the inner cylinder of the inner cylinder and the outer cylinder has a gap in the circumferential direction, and the outer cylinder is welded to the inner cylinder , catalytic converters thickness than the outer cylinder tube is characterized and Oh Ruco large.
( 2 ) In a catalytic converter in which a catalyst carrier having a holding mat wound around its outer periphery is housed in a casing,
The casing includes an inner cylinder and an outer cylinder, and at least the inner cylinder of the inner cylinder and the outer cylinder has a gap in one circumferential direction, the outer cylinder is welded to the inner cylinder, and the outer cylinder cylinder also has a one point gap in the circumferential direction, the outer cylinder is a catalytic converter, wherein the benzalkonium been welded to the inner cylinder at circumferential end portions.
( 3 ) The catalytic converter according to claim 1 or 2, wherein the outer cylinder has at least one protrusion in the circumferential direction.
[0006]
In the catalytic converters of the above (1) to ( 3 ), the casing has a double structure of an inner cylinder and an outer cylinder, at least the inner cylinder has a structure having a gap in the circumferential direction, and the outer cylinder is welded to the inner cylinder. The outer cylinder is relatively low in temperature when exposed to the atmosphere, and its thermal expansion is relatively small. It can be suppressed. In this case, even if the inner cylinder is thermally expanded in the circumferential direction, the expansion of the inner diameter of the inner cylinder is suppressed only by reducing the width of the gap in the circumferential direction. As a result, the thickness of the space between the inner cylinder inner diameter and the outer periphery of the catalyst carrier having a small thermal expansion hardly changes, and the decrease in the catalyst carrier holding force of the casing through the holding mat is small.
In the catalytic converter of the above ( 1 ), since it is the inner cylinder that holds the catalyst carrier via the holding mat, the rigidity of the inner cylinder can be increased by making the thickness of the inner cylinder larger than the thickness of the outer cylinder. The catalyst carrier holding power is ensured.
In the catalytic converter of ( 2 ), the outer cylinder also has a gap in one circumferential direction, and the outer cylinder is welded to the inner cylinder at both ends in the circumferential direction, so that a seal inside and outside the catalytic converter is secured.
In the catalytic converter of ( 3 ), since the outer cylinder has at least one protrusion in the circumferential direction, even if the outer cylinder does not thermally expand in the radial direction but thermally expands in the circumferential direction, the outer cylinder protrudes in the circumferential direction. Can be absorbed by reducing the width of the part.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show a catalytic converter 1 according to an embodiment of the present invention.
The catalytic converter 1 of the present invention is disposed in an exhaust gas passage of an internal combustion engine, and includes a catalyst carrier 2, a holding mat 3 wound around the catalyst carrier 2, and a casing 4 that holds the catalyst carrier 2 via the holding mat 3. And having.
The catalyst carrier 2 is a monolithic carrier made of, for example, ceramic, and has exhaust gas passages having a large number of minute cross sections (for example, in a honeycomb shape). The catalyst carrier 2 carries a catalyst component, and when the exhaust gas from the internal combustion engine flows through the catalyst carrier 2, it touches the catalyst component, and harmful components in the exhaust gas are rendered harmless.
The holding mat 3 is an alumina fiber mat, for example, is wound around the outer periphery of the catalyst carrier 2, is compressed and arranged in an annular space between the catalyst carrier 2 and the casing 4, and holds the catalyst carrier 2.
[0008]
The casing 4 is made of metal, for example, stainless steel, and accommodates the catalyst carrier 2 in which the holding mat 3 is wound around the outer periphery.
The casing 4 is connected to a cylindrical portion that accommodates the catalyst carrier 2 with the holding mat 3 wound on the inner periphery thereof, a diameter-expanded portion that is connected to the upstream side and expands toward the cylindrical portion, and a downstream side of the cylindrical portion. A reduced diameter portion that decreases in diameter as the distance from the cylindrical portion increases. The cross section of the cylindrical portion is preferably circular, but in some cases, the cross section may be elliptical.
The cylindrical portion of the casing 4 has an inner cylinder 5 and an outer cylinder 6 and has a two-part configuration welded in part. The outer cylinder 6 is wound around the outer periphery of the inner cylinder 5. The inner cylinder 5 is thicker than the outer cylinder 6. Prior to assembly, the inner cylinder 5 has greater rigidity than the outer cylinder 6.
The outer cylinder 6 is welded to the inner cylinder 5 by the welding part 7, and can slide on the inner cylinder 5 only by contacting the inner cylinder 5 except for the welding part 7.
[0009]
At least the inner cylinder 5 of the inner cylinder 5 and the outer cylinder 6 has a gap 8 in the circumferential direction. The gap 8 of the inner cylinder 5 is composed of a slit extending in the axial direction of the catalytic converter. The gap 8 of the inner cylinder 5 is formed in the cylindrical portion of the casing 4 and is not formed in the enlarged diameter portion and the reduced diameter portion. The inner cylinder 5 is not welded to the outer cylinder 6 at the edge of the gap 8 of the inner cylinder 5.
The outer cylinder 6 also has a gap 9 in the circumferential direction. The gap 9 in the outer cylinder 6 is a slit extending in the axial direction of the catalytic converter. The gap 9 of the outer cylinder 6 is formed in the cylindrical portion of the casing 4 and is not formed in the enlarged diameter portion and the reduced diameter portion. The gap 9 of the outer cylinder 6 is on the opposite side with respect to the gap 8 of the inner rattle 5 and the center of the cylindrical portion of the casing 4. The outer cylinder 6 is welded to the inner cylinder 5 at both ends in the circumferential direction of the outer cylinder 6 over the entire circumference of the edge of the slit of the outer cylinder 6, and the welded portion 7 seals the inside of the casing 4 from the outside. ing.
[0010]
For example, when the inner cylinder 5 has a C-shaped cross section, the outer cylinder 6 has an inverted C-shaped cross section, and a release section having a C-shaped cross section of the inner cylinder 5 and a release section having an inverted C-shaped cross section of the outer cylinder 6 The outer cylinder 6 is welded and sealed to the inner cylinder 5 at the end of the reverse C-shaped release portion of the outer cylinder 6 with the left and right sides opposite to each other. The inner cylinder 5 is not welded to the outer cylinder 6 at the edge of the release section having a C-shaped cross section of the inner cylinder 5.
[0011]
Desirably, the outer cylinder 6 has the protrusion (mountain-shaped protrusion) 10 of the shape which protrudes in the radial direction outward at least 1 place in the circumferential direction. In the illustrated example, two protrusions 10 are provided at positions symmetrical to each other with a straight line connecting the center of the gap 8 and the center of the gap 9 being a symmetrical centerline. When the outer cylinder 6 is thermally expanded in the circumferential direction under the condition in which the radial deformation of the outer cylinder 6 is constrained, the width of the base of the protrusion 10 is reduced, so that the circumferential direction of the outer cylinder portion other than the protrusion 10 is reduced. Elongation can be absorbed.
The protrusion 10 is formed on the cylindrical portion of the casing 4 and is not formed on the enlarged diameter portion and the reduced diameter portion.
[0012]
Next, the operation of the catalytic converter 1 of the present invention will be described.
In a normal temperature state before the exhaust gas flows, the casing 4 of the catalytic converter 1 is not thermally expanded, and the annular space between the casing 4 and the catalyst carrier 2 has an initial constant thickness, and the holding mat 3 The holding force maintains the initial holding force.
When exhaust gas flows, both the catalytic converter 1 and the catalyst carrier 2 become hot. In this case, in the casing 4, the inner cylinder 5 whose inner surface is exposed to the exhaust gas has a higher temperature than the outer cylinder 6 whose outer surface is exposed to the atmosphere. For example, when the exhaust gas temperature is about 900 ° C., the catalyst carrier 2 is about 900 ° C., the inner cylinder 5 of the casing 4 is about 800 ° C., and the outer cylinder 6 of the casing 4 is 200 to 300 ° C.
The amount of thermal expansion of the ceramic catalyst carrier 2 is much smaller than that of the metal casing 4. In order to suppress a decrease in the catalyst carrier holding power due to an increase in the gap between the annular catalyst gap 2 between the ceramic catalyst carrier 2 and the metal casing 4 due to a difference in thermal expansion when the catalytic converter 1 becomes high temperature, It is necessary to keep the amount of thermal expansion in the radial direction of the casing 4 small when the temperature of the converter 1 rises.
[0013]
In the present invention, the casing 4 has a two-part configuration, a double configuration of the inner cylinder 5 and the outer cylinder 6, at least the inner cylinder 5 has a structure having a gap 8 in the circumferential direction, and the outer cylinder 6 is connected to the inner cylinder 4. Since the outer cylinder 6 is welded on the opposite side to the gap 8, the outer cylinder 6 is exposed to the atmosphere and is at a relatively low temperature, and the thermal expansion is relatively small. The outer cylinder 6 with small thermal expansion suppresses the thermal expansion deformation of the inner cylinder 4. In this case, even if the inner cylinder 5 is expanded by thermal expansion in the circumferential direction, the increase in the inner diameter of the inner cylinder 5 can be suppressed only by reducing the width of the circumferential gap 8. As a result, the thickness of the space between the inner diameter of the inner cylinder 5 and the outer periphery of the catalyst carrier 2 having a small thermal expansion is almost the same as the initial state, and therefore the holding force of the holding mat 3 is hardly changed. There is little decrease in the holding power of the catalyst carrier 2 through the catalyst.
[0014]
The outer cylinder 6 also has a gap 9 at one place in the circumferential direction, and the outer cylinder 6 is welded to the inner cylinder 5 at both ends in the circumferential direction, that is, at the edges of the gap 9, so that the inner and outer cylinders are fixed. Is easily fixed, and a seal between the inside and outside of the catalytic converter 1 is also ensured.
Further, since it is the inner cylinder 5 that holds the catalyst carrier 2 via the holding mat 3, the rigidity of the inner cylinder 6 is increased by making the thickness of the inner cylinder 5 larger than the thickness of the outer cylinder 6. The catalyst carrier holding power is ensured.
[0015]
Further, since the outer cylinder 6 has at least one protrusion 10 in the circumferential direction, thermal expansion is restricted in the radial direction of the outer cylinder 6, and the outer cylinder 6 does not thermally expand in the radial direction but thermally expands in the circumferential direction. However, the circumferential extension can be absorbed by the reduction of the width of the protrusion 10, and the diameter of the casing 4 can be kept constant. And the gap between the catalyst carrier 2 and the casing 4 is always kept constant, and the reduction of the generated surface thickness of the holding mat 3 is prevented.
[0016]
【The invention's effect】
According to the catalytic converter of claims 1 to 3 , since the casing has a double configuration of an inner cylinder and an outer cylinder, at least the inner cylinder has a structure having a gap in one place in the circumferential direction, and the outer cylinder is welded to the inner cylinder. Even if the inner cylinder is exposed to high-temperature exhaust gas and tries to thermally expand, the relatively low-temperature outer cylinder suppresses thermal expansion deformation. In this case, even if the inner cylinder is thermally expanded in the circumferential direction, the expansion of the inner diameter of the inner cylinder is suppressed only by reducing the width of the gap in the circumferential direction. As a result, the size of the gap between the inner cylinder inner diameter and the outer periphery of the catalyst carrier is hardly changed, and the reduction in the catalyst carrier holding force of the casing through the holding mat is small.
According to the catalytic converter of the first aspect , by making the thickness of the inner cylinder larger than the thickness of the outer cylinder, the rigidity of the inner cylinder can be ensured and the catalyst carrier holding force can be ensured.
According to the catalytic converter of the second aspect , the outer cylinder also has a gap in one circumferential direction, and the outer cylinder is welded to the inner cylinder at both ends in the circumferential direction, so that a seal is secured.
According to the catalytic converter of the third aspect , the outer cylinder has at least one protrusion in the circumferential direction. Therefore, even if the outer cylinder does not thermally expand in the radial direction, It can be absorbed by reducing the width of the protrusion.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a casing of a catalytic converter according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of the catalytic converter as viewed along line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Catalytic converter 2 Catalyst support 3 Holding mat 4 Casing 5 Inner cylinder 6 Outer cylinder 7 Welding parts 8 and 9 Crevice 10 Projection

Claims (3)

外周に保持マットを巻いた触媒担体をケーシングに収容した触媒コンバータにおいて、
前記ケーシングは内筒と外筒とを有し、前記内筒と外筒のうち少なくとも内筒は周方向に１箇所隙間を有し、前記外筒は前記内筒に溶着されており、前記内筒は前記外筒より厚さが大であることを特徴とする触媒コンバータ。 In the catalytic converter in which the catalyst carrier having the holding mat wound around the outer periphery is accommodated in the casing,
The casing includes an inner cylinder and an outer cylinder, and at least the inner cylinder of the inner cylinder and the outer cylinder has a gap in the circumferential direction, and the outer cylinder is welded to the inner cylinder , catalytic converters thickness than the outer cylinder tube is characterized and Oh Ruco large. 外周に保持マットを巻いた触媒担体をケーシングに収容した触媒コンバータにおいて、
前記ケーシングは内筒と外筒とを有し、前記内筒と外筒のうち少なくとも内筒は周方向に１箇所隙間を有し、前記外筒は前記内筒に溶着されており、前記外筒も周方向に１箇所隙間を有し、前記外筒は周方向両端部で前記内筒に溶着されていることを特徴とする触媒コンバータ。 In the catalytic converter in which the catalyst carrier having the holding mat wound around the outer periphery is accommodated in the casing,
The casing includes an inner cylinder and an outer cylinder, and at least the inner cylinder of the inner cylinder and the outer cylinder has a gap in one circumferential direction, the outer cylinder is welded to the inner cylinder, and the outer cylinder cylinder also has a one point gap in the circumferential direction, the outer cylinder is a catalytic converter, wherein the benzalkonium been welded to the inner cylinder at circumferential end portions. 前記外筒は周方向に少なくとも１箇所突部を有する請求項１または請求項２記載の触媒コンバータ。Claim 1 or claim 2 catalytic converter, wherein the outer tube has at least one point protruding in the circumferential direction.
JP2002261608A 2002-09-06 2002-09-06 Catalytic converter Expired - Fee Related JP4225015B2 (en)

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