JPH07241478A - Metallic carrier for automobile exhaust purifying catalyst - Google Patents
Metallic carrier for automobile exhaust purifying catalystInfo
- Publication number
- JPH07241478A JPH07241478A JP6035061A JP3506194A JPH07241478A JP H07241478 A JPH07241478 A JP H07241478A JP 6035061 A JP6035061 A JP 6035061A JP 3506194 A JP3506194 A JP 3506194A JP H07241478 A JPH07241478 A JP H07241478A
- Authority
- JP
- Japan
- Prior art keywords
- honeycomb body
- cutting
- metal carrier
- exhaust gas
- foil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000003054 catalyst Substances 0.000 title claims description 6
- 239000002184 metal Substances 0.000 claims abstract description 30
- 239000011888 foil Substances 0.000 claims abstract description 29
- 238000005520 cutting process Methods 0.000 claims abstract description 19
- 238000010894 electron beam technology Methods 0.000 claims abstract description 5
- 239000002131 composite material Substances 0.000 claims description 3
- 230000008646 thermal stress Effects 0.000 abstract description 8
- 238000004804 winding Methods 0.000 abstract description 4
- 238000005304 joining Methods 0.000 abstract description 3
- 230000006378 damage Effects 0.000 abstract description 2
- 238000005868 electrolysis reaction Methods 0.000 abstract 1
- 230000002093 peripheral effect Effects 0.000 description 9
- 238000001816 cooling Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
Classifications
-
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は自動車エンジン等から排
出される排気ガスを浄化するための、排ガス触媒用メタ
ル担体に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas metal carrier for purifying exhaust gas emitted from an automobile engine or the like.
【０００２】[0002]
【従来の技術】従来、メタル担体は、耐熱ステンレス鋼
の平箔と波箔とを重ねて渦巻き状に巻き回し、或いは積
層してハニカム体を形成し、これを金属製の外筒に収納
し、平箔と波箔との接触部およびハニカム体と外筒とを
ロウ材等で適宜接合して製造している。このようなメタ
ル担体は自動車の排ガス系に設置されるが、エンジンか
ら排出される排気ガスは、自動車の運転状況によって温
度変化が大きく、排ガス系にあるメタル担体は、加熱〜
冷却の熱サイクルを繰り返し受ける。その結果、ハニカ
ム体を構成する平箔と波箔に膨張・収縮が繰り返し発生
して、接合部に熱応力が生じる。このような環境に搭載
されるメタル担体には、高温の排ガスに耐える耐食性、
耐酸化性とともに、加熱・冷却の熱サイクルおよびハニ
カム体内部の温度分布差により発生する熱応力・熱疲労
にも耐えることが重要である。2. Description of the Related Art Conventionally, a metal carrier is formed by stacking a heat-resistant stainless steel flat foil and a corrugated foil and spirally winding or laminating them to form a honeycomb body, which is housed in a metal outer cylinder. The contact portion between the flat foil and the corrugated foil, and the honeycomb body and the outer cylinder are appropriately joined together with a brazing material or the like for manufacturing. Such a metal carrier is installed in the exhaust gas system of an automobile, but the exhaust gas emitted from the engine has a large temperature change depending on the operating condition of the automobile, and the metal carrier in the exhaust gas system is heated to
Repeated thermal cycle of cooling. As a result, expansion and contraction occur repeatedly in the flat foil and the corrugated foil that form the honeycomb body, and thermal stress is generated in the bonded portion. The metal carrier mounted in such an environment has corrosion resistance to withstand high temperature exhaust gas,
In addition to oxidation resistance, it is important to withstand the thermal cycles of heating and cooling and the thermal stress and thermal fatigue generated by the difference in temperature distribution inside the honeycomb body.
【０００３】熱応力・熱疲労への対策としては、国際公
開ＷＯ９０／０３８４２号において、ハニカム体の端面
部および最外周部数層に接合部を形成するメタル担体を
提示している。しかし熱サイクルの負荷が更に厳しくな
ると、ハニカム体の端部接合部が急激な加熱・冷却によ
り膨張・収縮を繰り返し、ハニカム体接合部の外周近傍
に亀裂が発生し、その亀裂が熱サイクルの進展により拡
大・進行してハニカム体の破壊に至る問題が発生する。As a measure against thermal stress and thermal fatigue, International Publication WO90 / 03842 proposes a metal carrier in which a joint portion is formed in the end face portion and the outermost peripheral portion of the honeycomb body. However, when the heat cycle load becomes more severe, the end joints of the honeycomb body repeatedly expand and contract due to rapid heating and cooling, and cracks occur in the vicinity of the outer periphery of the honeycomb body joints. This causes a problem that the honeycomb body expands and progresses and the honeycomb body is destroyed.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上記したよ
うな現状における技術上の問題点を解決しようとするも
のであって、熱サイクルにより発生する熱応力・熱疲労
などで生ずるハニカム体の破壊を防止し得る自動排ガス
触媒用メタル担体を提供することを目的とする。DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned technical problems in the current state of the art, and is directed to a honeycomb body produced by thermal stress, thermal fatigue, etc. generated by thermal cycles. An object of the present invention is to provide a metal carrier for an automatic exhaust gas catalyst that can prevent destruction.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に本発明が要旨とするところは、耐熱金属からなる平箔
と波箔とを重ねて渦巻き状に巻き回してハニカム体を形
成し、平箔と波箔の接合が該ハニカム体の少なくとも一
方の端面で、中心から最外層まで全層なされており、そ
の全層接合部において周方向の複数箇所に、軸方向に切
断部を設けたことを特徴とするメタル担体である。ま
た、周方向の複数箇所に軸方向に設けられ切断部の長さ
が、前記全層接合部の長さより長くすることや、該切断
部の長さをハニカム体の中心部までとすることも好まし
い。更に、切断部の形成は電子ビームやレーザー、ワイ
ヤカット、電解複合切断などの手段により行うことが望
ましい。In order to achieve the above object, the gist of the present invention is to form a honeycomb body by stacking a flat foil and a corrugated foil made of a heat-resistant metal and spirally winding them. The flat foil and the corrugated foil are joined to each other in all layers from the center to the outermost layer on at least one end face of the honeycomb body, and the cut portions are provided in the axial direction at a plurality of positions in the circumferential direction in the all-layer joined portion. A metal carrier characterized by the above. Further, the length of the cut portion provided in a plurality of positions in the circumferential direction in the axial direction may be longer than the length of the all-layer bonded portion, or the length of the cut portion may be up to the central portion of the honeycomb body. preferable. Further, it is desirable to form the cut portion by means such as electron beam, laser, wire cutting, and electrolytic composite cutting.
【０００６】[0006]
【作用】この様に急激な加熱・冷却を受ける場合、ハニ
カム体の端部全層接合部では、急加熱によりハニカム体
表面の円芯側が膨張し、次に外筒の外部から急冷却され
るとハニカム体外周部の材料強度がリング状に強くなっ
た状態で外周部から収縮するため、端部全層接合部の外
周からやや内側の部分のハニカム体に座屈を生じ、これ
が繰り返されることにより、座屈した部分から亀裂が発
生する。When the honeycomb body is subjected to such rapid heating and cooling as described above, the circular core side of the honeycomb body surface is expanded by the rapid heating in the end-layer joint portion of the honeycomb body, and is then rapidly cooled from the outside of the outer cylinder. Since the material strength of the outer peripheral part of the honeycomb body shrinks from the outer peripheral part in a ring-like state, buckling occurs in the honeycomb part of the inner part from the outer periphery of the end all-layer bonding part, and this is repeated. As a result, a crack is generated from the buckled portion.
【０００７】本発明はハニカム体の全層接合部を、周方
向の複数箇所に軸方向に切断部を設けることにより、冷
却時にハニカム体外周部がリング状に収縮し、ハニカム
体内部を締めつけることを防止し、ハニカム体の座屈の
発生を防ぐ点に着目したものである。According to the present invention, by providing all-layer-bonded portions of the honeycomb body with axially cut portions at a plurality of circumferential positions, the outer peripheral portion of the honeycomb body shrinks in a ring shape during cooling to tighten the inside of the honeycomb body. It is intended to prevent the occurrence of buckling and to prevent buckling of the honeycomb body.
【０００８】[0008]
【実施例】以下に本発明を、図に示す実施例に基づいて
詳細に説明する。図１は、本発明のメタル担体１を模式
的に示したものであり、２はハニカム体、３はハニカム
体を収納する外筒である。また図２は、本発明のメタル
担体１を排ガス入側より見た模式図である。ハニカム体
２は図２に示されているように、高耐熱性ステンレス鋼
の平箔４と波箔５とを重ねて渦巻き状に巻き回して形成
され、金属製の外筒３に収納されている。また図３は図
１に示したメタル担体１の軸方向断面の一例である。ハ
ニカム体２には平箔４と波箔５との接触部に、図３の斜
線部で示した接合部２１を設けている。すなわち、ハニ
カム体２の少なくとも一端面側、および外周部より半径
方向に少なくとも１層、乃至は多くとも外周側３分の１
以下の複数層を接合（外周強化層２２）している。６は
ハニカム体２の外周と外筒３の内周との接合部であり、
図示の例では担体の排ガス出側で接合しているが、必ず
しもこの位置に限定されない。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the embodiments shown in the drawings. FIG. 1 schematically shows a metal carrier 1 of the present invention, 2 is a honeycomb body, and 3 is an outer cylinder for housing the honeycomb body. Further, FIG. 2 is a schematic view of the metal carrier 1 of the present invention as seen from the exhaust gas inlet side. As shown in FIG. 2, the honeycomb body 2 is formed by stacking a flat foil 4 and a corrugated foil 5 of high heat-resistant stainless steel and winding them in a spiral shape, and is housed in a metal outer cylinder 3. There is. 3 is an example of an axial cross section of the metal carrier 1 shown in FIG. The honeycomb body 2 is provided with the joint portion 21 shown by the hatched portion in FIG. 3 at the contact portion between the flat foil 4 and the corrugated foil 5. That is, at least one layer of the honeycomb body 2 at least on one end face side and in the radial direction from the outer peripheral portion, or at most one third on the outer peripheral side.
The following plural layers are joined (peripheral strengthening layer 22). 6 is a joint between the outer periphery of the honeycomb body 2 and the inner periphery of the outer cylinder 3,
In the illustrated example, the support is joined on the exhaust gas outlet side, but it is not necessarily limited to this position.
【０００９】ハニカム体２には図２、図４に示すごと
く、少なくとも一端面側の全層接合部２１において、周
方向の複数箇所に、軸方向に切断部７（スリット）を設
けている。この切断部７は一本以上、好ましくは複数本
とし、図示の例では４本としている。この切断部７によ
りハニカム体２の全層接合部２１は複数の部分に分断さ
れ、エンジン稼働時の熱サイクルにより発生するハニカ
ム体２の径方向および周方向の熱応力が緩和される。さ
らに、図５に示す如く、切断部７の軸方向長さをハニカ
ム体２の全層接合部２１の長さよりも長くすることが応
力緩和により有効である。As shown in FIGS. 2 and 4, the honeycomb body 2 is provided with cutting portions 7 (slits) in the axial direction at a plurality of positions in the circumferential direction at least in the all-layer joining portion 21 on the one end face side. The number of the cutting portions 7 is one or more, preferably a plurality, and in the illustrated example, it is four. The cutting portion 7 divides the all-layer bonded portion 21 of the honeycomb body 2 into a plurality of portions, and relaxes the thermal stress in the radial direction and the circumferential direction of the honeycomb body 2 caused by the thermal cycle during engine operation. Furthermore, as shown in FIG. 5, it is effective for stress relaxation that the axial length of the cut portion 7 is made longer than the length of the all-layer joint portion 21 of the honeycomb body 2.
【００１０】この切断部７は電子ビーム、レーザー、ワ
イヤカット或いは電解複合切断等の手段により、ハニカ
ム体２の外周面から半径方向に少なくとも５分の１、好
ましくは全幅にわたり形成する。切断部７のスリット幅
については特に限定はしないが、切断部の箔が熱膨張時
に接触しない間隔を保持できれば充分であり、具体的に
は最大１mmとすればよい。The cutting portion 7 is formed by at least one-fifth, preferably the entire width in the radial direction from the outer peripheral surface of the honeycomb body 2 by means of electron beam, laser, wire cutting or electrolytic composite cutting. The slit width of the cut portion 7 is not particularly limited, but it is sufficient if the foil of the cut portion can maintain a gap that does not contact during thermal expansion, and specifically, the maximum width may be 1 mm.
【００１１】以下に本発明の具体例を示す。図２に示す
ように、厚さ５０μm のフェライト系ステンレス鋼の平
箔４と波箔５を重ねて巻き回しハニカム体２を形成し、
外形８０mm、厚さ１．５mm、長さ１００mmのステンレス
鋼製外筒３に挿入し、メタル担体１を構成した。ハニカ
ム体２における全層接合部２１は端面より２０mmとし、
かつ軸方向の全長に最外周より３巻を接合し、外周強化
層２２とした。ハニカム体２と外筒３は排ガス出側で接
合６し、その長さを４０mmとした。このメタル担体１に
おけるハニカム体２の全層接合部２１に、電子ビームを
用いて切断部７を全層接合部２１と同等の長さに、周方
向４箇所に形成した。Specific examples of the present invention are shown below. As shown in FIG. 2, a flat foil 4 and a corrugated foil 5 of ferritic stainless steel having a thickness of 50 μm are superposed and wound to form a honeycomb body 2.
The metal carrier 1 was constructed by inserting it into a stainless steel outer cylinder 3 having an outer diameter of 80 mm, a thickness of 1.5 mm and a length of 100 mm. The total layer joint portion 21 of the honeycomb body 2 is 20 mm from the end face,
In addition, the outer circumferential reinforcing layer 22 was formed by joining three turns from the outermost circumference to the entire length in the axial direction. The honeycomb body 2 and the outer cylinder 3 were joined 6 on the exhaust gas outlet side, and the length thereof was 40 mm. In the all-layer joints 21 of the honeycomb body 2 of the metal carrier 1, the cutting portions 7 were formed at four locations in the circumferential direction by using an electron beam so as to have the same length as the all-layer joints 21.
【００１２】以上のように構成した本発明のメタル担体
を、エンジン排ガスによる加熱（９００℃）・冷却（１
００℃以下）を繰り返すエンジンテストを行ない、その
結果を表１に示す。１０００サイクルを経てもハニカム
体は健全に保たれており、熱応力・熱疲労に強いことが
判った。The metal carrier of the present invention configured as described above is heated (900 ° C.) / Cooled (1) by engine exhaust gas.
The engine test was repeated (less than 00 ° C) and the results are shown in Table 1. It was found that the honeycomb body was kept sound even after 1000 cycles, and was resistant to thermal stress and thermal fatigue.
【００１３】一方、ハニカム体２の全層接合部２１に切
断部７を設けない比較例では、接合部の端面に亀裂を生
じ、熱サイクルの進展により亀裂が拡大する傾向が見ら
れた。On the other hand, in the comparative example in which the cut portion 7 was not provided in the all-layer bonded portion 21 of the honeycomb body 2, a crack was generated in the end face of the bonded portion, and there was a tendency that the crack expanded as the heat cycle progressed.
【００１４】[0014]
【表１】 [Table 1]
【００１５】[0015]
【発明の効果】以上のように、本発明のメタル担体によ
れば、ハニカム体の内部に発生する熱応力を、切断部を
設けることにより低減し、ハニカム体の排ガス入側端面
に発生する亀裂を防止することが可能となり、充分な耐
久性能のもとに排ガスの浄化を実施できる。As described above, according to the metal carrier of the present invention, the thermal stress generated inside the honeycomb body is reduced by providing the cut portion, and the cracks generated at the exhaust gas inlet side end surface of the honeycomb body are reduced. The exhaust gas can be prevented and the exhaust gas can be purified with sufficient durability.
【図１】本発明のメタル担体の外観を示す説明図であ
る。FIG. 1 is an explanatory diagram showing an appearance of a metal carrier of the present invention.
【図２】本発明のメタル担体を、排ガス入側の上面より
見た説明図である。FIG. 2 is an explanatory view of the metal carrier of the present invention seen from the upper surface on the exhaust gas inlet side.
【図３】本発明のメタル担体のロウ付け構造を示す模式
図である。FIG. 3 is a schematic view showing a brazing structure of a metal carrier of the present invention.
【図４】本発明のメタル担体のハニカム体の外観を示す
説明図である。[Fig. 4] Fig. 4 is an explanatory view showing an appearance of a honeycomb body of a metal carrier of the present invention.
【図５】本発明のメタル担体の、他の実施例によるハニ
カム体の外観を示す説明図である。[Fig. 5] Fig. 5 is an explanatory view showing the appearance of a honeycomb body of another embodiment of the metal carrier of the present invention.
１ メタル担体 ２ ハニカム体 ２１ 端面全層接合部 ２２ 外周強化層 ３ 外筒 ４ 平箔 ５ 波箔 ６ ハニカム体と外筒との接合部 ７ 切断部（スリット） DESCRIPTION OF SYMBOLS 1 Metal carrier 2 Honeycomb body 21 End face all-layer joining part 22 Outer peripheral reinforcing layer 3 Outer cylinder 4 Flat foil 5 Corrugated foil 6 Joining part between honeycomb body and outer cylinder 7 Cutting part (slit)
───────────────────────────────────────────────────── フロントページの続き (72)発明者 石川 泰 愛知県東海市東海町５−３ 新日本製鐵株 式会社名古屋製鐵所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasushi Ishikawa 5-3 Tokai-cho, Tokai City, Aichi Prefecture Nippon Steel Co., Ltd. Nagoya Steel Works
Claims (4)
渦巻き状に巻き回してハニカム体を形成し、平箔と波箔
の接合が該ハニカム体の少なくとも一方の端面で、中心
から最外層まで全層なされており、その全層接合部にお
いて周方向の複数箇所に、軸方向に切断部を設けたこと
を特徴とする自動車排ガス触媒用メタル担体。1. A flat foil made of a heat-resistant metal and a corrugated foil are superposed and spirally wound to form a honeycomb body, and the flat foil and the corrugated foil are joined from at least one end face of the honeycomb body from the center. A metal carrier for an automobile exhaust gas catalyst, characterized in that all layers are formed up to the outermost layer, and cutting portions are provided in the axial direction at a plurality of positions in the circumferential direction at the joint portion of all layers.
切断部の長さが、前記全層接合部の長さより長くした請
求項１記載の自動車排ガス触媒用メタル担体。2. The metal carrier for an automobile exhaust gas catalyst according to claim 1, wherein the lengths of the cut portions axially provided at a plurality of positions in the circumferential direction are longer than the length of the all-layer joint portion.
切断部の長さを、ハニカム体の中心部までとした請求項
１記載の自動車排ガス触媒用メタル担体。3. The metal carrier for an automobile exhaust gas catalyst according to claim 1, wherein the lengths of the cut portions axially provided at a plurality of positions in the circumferential direction are up to the central portion of the honeycomb body.
ーカット、或いは電解複合切断により形成したことを特
徴とする請求項１〜３のいずれか１項記載の自動車排ガ
ス触媒用メタル担体。4. The metal carrier for an automobile exhaust gas catalyst according to claim 1, wherein the cutting portion is formed by electron beam, laser, wire cutting, or electrolytic composite cutting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6035061A JPH07241478A (en) | 1994-03-04 | 1994-03-04 | Metallic carrier for automobile exhaust purifying catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6035061A JPH07241478A (en) | 1994-03-04 | 1994-03-04 | Metallic carrier for automobile exhaust purifying catalyst |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07241478A true JPH07241478A (en) | 1995-09-19 |
Family
ID=12431515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6035061A Withdrawn JPH07241478A (en) | 1994-03-04 | 1994-03-04 | Metallic carrier for automobile exhaust purifying catalyst |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07241478A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008532735A (en) * | 2005-02-18 | 2008-08-21 | エミテック ゲゼルシヤフト フユア エミツシオンス テクノロギー ミツト ベシユレンクテル ハフツング | Honeycomb body with internal cavity |
| JP2011194318A (en) * | 2010-03-19 | 2011-10-06 | Ngk Insulators Ltd | Honeycomb structure |
-
1994
- 1994-03-04 JP JP6035061A patent/JPH07241478A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008532735A (en) * | 2005-02-18 | 2008-08-21 | エミテック ゲゼルシヤフト フユア エミツシオンス テクノロギー ミツト ベシユレンクテル ハフツング | Honeycomb body with internal cavity |
| JP2011194318A (en) * | 2010-03-19 | 2011-10-06 | Ngk Insulators Ltd | Honeycomb structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010508 |