JP2001329836A - Ceramic honeycomb structure - Google Patents
Ceramic honeycomb structureInfo
- Publication number
- JP2001329836A JP2001329836A JP2000151441A JP2000151441A JP2001329836A JP 2001329836 A JP2001329836 A JP 2001329836A JP 2000151441 A JP2000151441 A JP 2000151441A JP 2000151441 A JP2000151441 A JP 2000151441A JP 2001329836 A JP2001329836 A JP 2001329836A
- Authority
- JP
- Japan
- Prior art keywords
- ceramic honeycomb
- honeycomb structure
- metal container
- outer peripheral
- peripheral surface
- 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.)
- Granted
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 69
- 230000002093 peripheral effect Effects 0.000 claims abstract description 25
- 229910052751 metal Inorganic materials 0.000 claims description 32
- 239000002184 metal Substances 0.000 claims description 32
- 230000003197 catalytic effect Effects 0.000 description 19
- 239000003054 catalyst Substances 0.000 description 11
- 238000001125 extrusion Methods 0.000 description 11
- 239000004927 clay Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000000873 masking effect Effects 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 229910052878 cordierite Inorganic materials 0.000 description 2
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 241001422033 Thestylus Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
Landscapes
- Exhaust Gas After Treatment (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Catalysts (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、把持部材を介して
金属容器に収納されるセラミックハニカム構造体に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic honeycomb structure housed in a metal container via a holding member.
【０００２】[0002]
【従来の技術】地球環境の保全面から、自動車などのエ
ンジンから排出される排気ガスの削減が求められ、これ
に応えるために排気ガス浄化用の触媒コンバータが用い
られている。そのような触媒コンバータのひとつにセラ
ミックハニカム触媒コンバータがあり、このセラミック
ハニカム触媒コンバータは、触媒を担持したセラミック
ハニカム構造体を排気ガスの保有する熱エネルギで加熱
して触媒を活性化することにより排気ガスを浄化してい
る。2. Description of the Related Art From the viewpoint of preserving the global environment, it is required to reduce exhaust gas emitted from engines of automobiles and the like, and a catalytic converter for purifying exhaust gas has been used in order to meet the demand. One of such catalytic converters is a ceramic honeycomb catalytic converter. This ceramic honeycomb catalytic converter heats a ceramic honeycomb structure carrying a catalyst with heat energy held by exhaust gas to activate the catalyst, thereby reducing exhaust gas. Purifying gas.
【０００３】図５は、従来のセラミックハニカム触媒コ
ンバータ５０を排気マニホルド５４にボルト５６で連結
した要部断面図である。以下、「セラミックハニカム触
媒コンバータ」を略して「触媒コンバータ」という。図
５で、触媒コンバータ５０は、金属容器５１、触媒を担
持したコージェライトからなる低熱膨張のセラミックハ
ニカム構造体５２、金属容器５１とセラミックハニカム
構造体５２間に介装される把持部材５３などからなる。
セラミックハニカム構造体５２は外周面５２ａが平滑に
形成されている。また、図６は、図５のセラミックハニ
カム構造体５２を示し、（ａ）はその斜視図、（ｂ）は
外周面５２ａを拡大した模式図である。そして、金属容
器５１の内周面５１ａで圧縮状態となった把持部材５３
の面圧によりセラミックハニカム構造体５２の外周面５
２ａが把持され金属容器５１内に収納されている。この
ような構成の触媒コンバータ５２は、自動車用排気ガス
浄化システムに広く使用されており、実開昭５６−６７
３１４号公報、実開昭５５−１３００１２号公報及び実
開昭６２−１７１６１４号公報などに開示されている。FIG. 5 is a sectional view of a main part in which a conventional ceramic honeycomb catalytic converter 50 is connected to an exhaust manifold 54 by bolts 56. Hereinafter, "the ceramic honeycomb catalytic converter" is abbreviated as "catalytic converter". In FIG. 5, a catalytic converter 50 includes a metal container 51, a low-thermal-expansion ceramic honeycomb structure 52 made of cordierite supporting a catalyst, and a gripping member 53 interposed between the metal container 51 and the ceramic honeycomb structure 52. Become.
The outer peripheral surface 52a of the ceramic honeycomb structure 52 is formed smoothly. 6 shows the ceramic honeycomb structure 52 of FIG. 5, (a) is a perspective view thereof, and (b) is an enlarged schematic view of an outer peripheral surface 52a. Then, the gripping member 53 which is in a compressed state on the inner peripheral surface 51 a of the metal container 51.
Outer peripheral surface 5 of ceramic honeycomb structure 52 due to the surface pressure of
2a is held in the metal container 51. The catalytic converter 52 having such a configuration is widely used in an automobile exhaust gas purification system.
Nos. 314, 55-130012 and 62-171614.
【０００４】一方、特開平７−１２７４４３号公報に
は、前記従来構造の触媒コンバータにおいて、把持部材
を排ガスの流路方向に固定する少なくとも１つの固定部
材を金属容器に設けることで、触媒コンバータの高温作
動時に把持部材による外周側からの把持力が低下しても
セラミックハニカム構造体が金属容器内で流路方向に遊
動せず、セラミックハニカム構造体の早期の摩耗や破損
を防止できるとする開示がある。On the other hand, Japanese Patent Application Laid-Open No. Hei 7-127443 discloses that in a conventional catalytic converter, at least one fixing member for fixing a gripping member in a flow direction of exhaust gas is provided in a metal container. Disclosure that the ceramic honeycomb structure does not move in the direction of the flow path in the metal container even if the gripping force from the outer peripheral side by the gripping member is reduced at the time of high-temperature operation, thereby preventing early wear and breakage of the ceramic honeycomb structure. There is.
【０００５】[0005]
【発明が解決しようとする課題】近年、排気ガスの更な
る削減が求められ、これに対応してエンジンの高出力
化、高温燃焼化が進められている。また触媒は冷間時に
は作用しないために、エンジンスタート後に触媒を早期
に昇温し活性状態にするため、触媒コンバータを排気ガ
ス温度の高いエンジン直下に配置されることも多く、触
媒コンバータはより高温に曝されるようになってきてい
る。図５に示す従来の触媒コンバータ５０は、図６
（ｂ）に示すようにセラミックハニカム構造体５２の外
周面５２ａが押出成形において平滑に形成されているた
め、高温の排気ガスにより金属容器５３が膨張した場
合、セラミックハニカム構造体５２は低熱膨張であるた
めに、把持部材５３の圧縮状態が緩和され、セラミック
ハニカム構造体５２の把持力が低下する。そして、セラ
ミックハニカム構造体５２は、略直立して配置された場
合などに外周面５２ａでは拘束しきれずにエンジンの振
動などによって把持部材５３から離動し、金属容器５１
のコーン部５１ｃとの衝突及び摩擦により早期に破損又
は摩耗するという問題点がある。In recent years, further reduction of exhaust gas has been demanded, and in response to this, higher output and higher temperature combustion of the engine have been promoted. In addition, since the catalyst does not work when it is cold, the catalyst converter is often placed immediately below the engine where the exhaust gas temperature is high in order to raise the temperature of the catalyst early and activate it after the start of the engine. Is being exposed to The conventional catalytic converter 50 shown in FIG.
As shown in (b), the outer peripheral surface 52a of the ceramic honeycomb structure 52 is formed smoothly by extrusion, so that when the metal container 53 expands due to high-temperature exhaust gas, the ceramic honeycomb structure 52 has low thermal expansion. For this reason, the compressed state of the gripping member 53 is relaxed, and the gripping force of the ceramic honeycomb structure 52 is reduced. When the ceramic honeycomb structure 52 is disposed substantially upright, the ceramic honeycomb structure 52 cannot be completely restrained on the outer peripheral surface 52a and moves away from the gripping member 53 due to vibration of the engine and the like.
There is a problem that it is damaged or worn out early due to collision and friction with the cone portion 51c.
【０００６】一方、特開平７−１２７４４３号公報に開
示される、把持部材とは別の保持部材を金属容器内に設
けるには、保持部材が嵌合する金属容器の内周面を精密
に加工しなければならず製造コストを上昇させる。ま
た、高温の排気ガスにより金属容器が膨張すると、セラ
ミックハニカム構造体は、その外周面が前述した図６と
同様に平滑に形成されているため、把持部材による把持
力が低下し、エンジンの振動などにより離動した場合、
金属容器の端面との衝突及び摩擦により早期に破損又は
摩耗するという問題点がある。On the other hand, in order to provide a holding member different from the gripping member in the metal container disclosed in Japanese Patent Application Laid-Open No. 7-127443, the inner peripheral surface of the metal container to which the holding member is fitted is precisely machined. Must increase manufacturing costs. Further, when the metal container is expanded by the high-temperature exhaust gas, the outer peripheral surface of the ceramic honeycomb structure is formed smoothly as in FIG. 6 described above. If you move away due to
There is a problem that the metal container is damaged or worn early due to collision and friction with the end surface of the metal container.
【０００７】本発明の課題は、把持部材を介して金属容
器に収納されるセラミックハニカム構造体であって、高
温の排気ガスにより金属容器が膨張しても把持部材によ
る把持力を低下させず、例えばエンジンの振動などによ
って離動せず、金属容器との衝突及び摩擦による破損又
は摩耗を少なくできるセラミックハニカム構造体を得る
ことにある。An object of the present invention is to provide a ceramic honeycomb structure housed in a metal container via a gripping member, which does not reduce the gripping force of the gripping member even when the metal container expands due to high-temperature exhaust gas. For example, it is an object of the present invention to provide a ceramic honeycomb structure that does not move away due to vibration of an engine and can reduce damage or wear due to collision and friction with a metal container.
【０００８】[0008]
【課題を解決するための手段】本発明は、把持部材を介
して金属容器に収納されるセラミックハニカム構造体で
あって、前記セラミックハニカム構造体の外周面に凹凸
が形成されていることを特徴とする。そして、前記凹凸
は、最大高さが５〜５００μｍであることを特徴とす
る。According to the present invention, there is provided a ceramic honeycomb structure housed in a metal container via a gripping member, wherein irregularities are formed on an outer peripheral surface of the ceramic honeycomb structure. And The irregularities have a maximum height of 5 to 500 μm.
【０００９】セラミックハニカム構造体の外周面に凹凸
を形成することで外周面の表面積が増加して圧縮状態の
把持部材を介して金属容器内に確実に把持される。凹凸
は最大高さが５μｍ未満では把持力が少なく、一方、凹
凸は最大高さが５００μｍを超えるとセラミックハニカ
ム構造体と把持部材が接触しない部分ができて逆に把持
力が低下する。なお、セラミックハニカム構造体に形成
する凹凸をハニカムの流路方向に垂直各断面において略
一様とすれば、ガスの流れ方によりセラミックハニカム
構造体が円周方向に振動しても、金属容器内に更に確実
に把持される。[0009] By forming irregularities on the outer peripheral surface of the ceramic honeycomb structure, the surface area of the outer peripheral surface is increased, and the ceramic honeycomb structure is securely held in the metal container via the compressed holding member. When the maximum height of the unevenness is less than 5 μm, the gripping force is small. On the other hand, when the maximum height of the unevenness exceeds 500 μm, a portion where the ceramic honeycomb structure does not come into contact with the gripping member is formed, and conversely, the gripping force is reduced. If the irregularities formed on the ceramic honeycomb structure are made substantially uniform in each cross section perpendicular to the flow direction of the honeycomb, even if the ceramic honeycomb structure vibrates in the circumferential direction due to the flow of gas, the inside of the metal container is not affected. Is more reliably gripped.
【００１０】そして、高温の排気ガスにより金属容器が
膨張しても、把持部材によるセラミックハニカム構造体
の把持力は低下せず、エンジンの振動などによってもセ
ラミックハニカム構造体が離動せず、金属容器のコーン
部などとの摩擦によるセラミックハニカム構造体の摩耗
を少なくする。[0010] Even if the metal container expands due to the high-temperature exhaust gas, the gripping force of the ceramic honeycomb structure by the gripping member does not decrease, and the ceramic honeycomb structure does not move away due to engine vibration or the like. Abrasion of the ceramic honeycomb structure due to friction with a container cone or the like is reduced.
【００１１】[0011]
【発明の実施の形態】以下、実施の形態のひとつとして
乗用車用ガソリンエンジン直下に取り付けた触媒コンバ
ータの例を、図１乃至図４により説明する。図１は、触
媒コンバータ１０を排気マニホルド１４に摩擦圧接によ
り圧接部１６で連結した断面図である。また、図２は、
図１でのセラミックハニカム構造体１２を示し、（ａ）
はその斜視図、（ｂ）は外周面１２ａを拡大した模式図
である。また、図３は、図２での３箇所（１２ａ−ａ、
１２ａ−ｂ、１２ａ−ｃ）に形成した凹凸の一例であ
る。また図４は（ａ）はセラミックハニカム構造体の押
出成形後の拡大部分図であり、（ｂ）は押出成形用金型
の要部断面図である。図１及び図２で、触媒コンバータ
１０は、把持部材１３を介して触媒を担持したセラミッ
クハニカム構造体１２が金属容器１１に収納されてい
る。金属容器１１は高Ｓｉ球状黒鉛鋳鉄材からなり、把
持部材１３を介してセラミックハニカム構造体１２を収
納する内周面１１ａは中空円筒形状とし、排気管（図示
せず）と連結するフランジ部１１ｄに向けてコーン部１
１ｃを形成している。セラミックハニカム構造体１２
は、主にＳｉＯ2 、Ａｌ2Ｏ3、ＭｇＯを含むコージェラ
イト質セラミックスからなり、蜂の巣状の排気ガスの流
通路に活性アルミナや白金などの触媒を担持している。
なお、セラミックハニカム構造体１２は外周面の直径が
１００ｍｍで長手方向が１００ｍｍとしている。また、
把持部材１３は、耐熱性のセラミック繊維からなる。自
動車などのエンジンに搭載された場合、排気ガスは排気
マニホルド１４に入った後（ＩＮで示す）、コーン部１
４ｃを経て、セラミックハニカム構造体に流入し、セラ
ミックハニカム構造体１２に担持された触媒（図示せ
ず）で浄化され、コーン部１１ｃを経て排気管に向かう
（ＯＵＴで示す）。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a catalytic converter mounted immediately below a gasoline engine for a passenger car will be described below with reference to FIGS. FIG. 1 is a cross-sectional view in which a catalytic converter 10 is connected to an exhaust manifold 14 at a pressure contact portion 16 by friction pressure welding. Also, FIG.
2A shows the ceramic honeycomb structure 12 in FIG.
Is a perspective view thereof, and (b) is a schematic diagram in which an outer peripheral surface 12a is enlarged. FIG. 3 shows three points (12a-a, 12a-a,
It is an example of the unevenness formed in 12a-b and 12a-c). 4A is an enlarged partial view of the ceramic honeycomb structure after extrusion molding, and FIG. 4B is a sectional view of a main part of an extrusion molding die. 1 and 2, in the catalytic converter 10, a ceramic honeycomb structure 12 supporting a catalyst via a holding member 13 is housed in a metal container 11. The metal container 11 is made of a high Si spheroidal graphite cast iron material. The inner peripheral surface 11a for accommodating the ceramic honeycomb structure 12 via the holding member 13 is formed in a hollow cylindrical shape, and a flange portion 11d connected to an exhaust pipe (not shown). Cone part 1 toward
1c. Ceramic honeycomb structure 12
Is mainly made of cordierite ceramics containing SiO 2 , Al 2 O 3 , and MgO, and carries a catalyst such as activated alumina or platinum in a honeycomb-shaped exhaust gas passage.
The ceramic honeycomb structure 12 has an outer peripheral surface having a diameter of 100 mm and a longitudinal direction of 100 mm. Also,
The holding member 13 is made of a heat-resistant ceramic fiber. When mounted on an engine such as a car, the exhaust gas enters the exhaust manifold 14 (indicated by IN) and then enters the cone 1
After passing through 4c, it flows into the ceramic honeycomb structure, is purified by a catalyst (not shown) supported on the ceramic honeycomb structure 12, and goes to the exhaust pipe via the cone portion 11c (indicated by OUT).
【００１２】ここで、図２に示すように、セラミックハ
ニカム構造体１２にはその外周面１２ａに最大高さが５
〜５００μｍの凹凸部１２ｂが、ハニカム流路方向に形
成されている。図３に示す一例では、表面粗さ計で１０
ｍｍトレースして凹凸を測定し、この凹凸を上下方向の
み変形拡大して示している。表面粗さ計は東京精密製表
面粗さ輪郭形状測定器を用い、触針の曲率半径０．０２
５ｍｍ、トレーシングスピード０．１５ｍｍ／ｓで行っ
た。凹凸部１２ｂの最大高さが（１２ａ−ａ）２８μ
ｍ、（１２ａ−ｂ）３２μｍ、（１２ａ−ｃ）４５μｍ
などとなっている。そして、この凹凸部１２ｂと、圧縮
状態の把持部材１３の面圧とにより、セラミックハニカ
ム構造体１２は確実に把持されている。この触媒コンバ
ータ１０は、例えば９００℃を超える排気ガスにより金
属容器１１が膨張しても把持部材１３によるセラミック
ハニカム構造体１２の把持力は低下せず、エンジンの振
動などによってもセラミックハニカム構造体１２が離動
せず、金属容器１１のコーン部１１ｃとの衝突及び摩擦
による破損及び摩耗が少なくなる。Here, as shown in FIG. 2, the ceramic honeycomb structure 12 has a maximum height of 5 on its outer peripheral surface 12a.
An uneven portion 12b of up to 500 μm is formed in the honeycomb channel direction. In the example shown in FIG.
The mm is traced to measure the unevenness, and the unevenness is deformed and enlarged only in the vertical direction. The surface roughness meter uses a surface roughness profile measuring instrument manufactured by Tokyo Seimitsu Co., Ltd., and the radius of curvature of the stylus is 0.02.
The tracing speed was 5 mm and the tracing speed was 0.15 mm / s. The maximum height of the uneven portion 12b is (12a-a) 28μ.
m, (12a-b) 32 μm, (12a-c) 45 μm
And so on. Then, the ceramic honeycomb structure 12 is securely held by the uneven portion 12b and the surface pressure of the holding member 13 in a compressed state. For example, the catalytic converter 10 does not reduce the gripping force of the ceramic honeycomb structure 12 by the gripping member 13 even if the metal container 11 expands due to exhaust gas exceeding 900 ° C. Are not separated, and damage and wear due to collision and friction with the cone portion 11c of the metal container 11 are reduced.
【００１３】次に、セラミックハニカム構造体１２の成
形方法について説明する。図４（ａ）はセラミックハニ
カム構造体１２の押出成形後の拡大部分図であり、図４
（ｂ）はセラミックハニカム構造体１２の押出成形用金
型２０の要部断面図である。図４（ｂ）の押出成形用金
型２０は、多数の供給通路２１ａとこの供給通路２１ａ
から坏土を集合すると共に格子状に形成する排出通路２
１ｂを持つダイ２１と、セラミックハニカム構造体１２
の外周壁１２ｆを所定形状に形成するために、坏土流入
量の調整をするマスキングプレート２２、坏土の排出量
の調節をすると共にセラミックハニカム構造体１２の外
周面１２ａの調節を行う押さえ枠２３などからなる。な
お、図４において押出成形用金型２０は、下から上が押
出方向（矢印で示す）であり、坏土を供給通路２１ａか
ら排出通路２１ｂに押し出すことで、図４（ａ）の開口
部１２ｄを持ち隔壁１２ｅが例えば厚さ１５０μｍで、
外周壁１２ｆの厚さが例えば２５０μｍからなるセラミ
ックハニカム構造体１２の成形体となる。そして、出口
側に設けた押さえ枠２３の厚さ（ｔ）、直径（Ｄｓ）及
び内径側突出量（ｗ）を調整することで、供給通路２１
ａ、排出通路２１ｂを通った坏土が圧着されて成形さ
れ、外周壁１２ｆの外周面１２ａが形成される。凹凸１
２ｂ形成のコントロールは、マスキングプレート２２の
直径（Ｄｍ）、押さえ枠２３の厚さ（ｔ）、直径（Ｄ
ｓ）及び内径側突出量（ｗ）によってなされ、セラミッ
クハニカム構造体１２の成形体の後工程の焼成工程を経
て、表面粗さ２０〜５００μｍＲａでハニカム流路方向
に凹凸が形成される。Next, a method of forming the ceramic honeycomb structure 12 will be described. FIG. 4A is an enlarged partial view of the ceramic honeycomb structure 12 after extrusion molding.
FIG. 2B is a cross-sectional view of a main part of an extrusion molding die 20 of the ceramic honeycomb structure 12. The extrusion molding die 20 shown in FIG. 4B has a large number of supply passages 21a and the supply passages 21a.
Discharge passage 2 which collects kneaded clay and forms a lattice
Die 21 having ceramic 1b and ceramic honeycomb structure 12
In order to form the outer peripheral wall 12f into a predetermined shape, a masking plate 22 for adjusting the amount of the clay inflow, a holding frame for adjusting the amount of the clay discharged and adjusting the outer peripheral surface 12a of the ceramic honeycomb structure 12 23 and the like. In FIG. 4, the extrusion mold 20 has an extrusion direction from the bottom to the top (indicated by an arrow), and the kneaded material is extruded from the supply passage 21a to the discharge passage 21b so that the opening shown in FIG. The partition 12e having 12d has a thickness of, for example, 150 μm,
A molded body of the ceramic honeycomb structure 12 having a thickness of the outer peripheral wall 12f of, for example, 250 μm is obtained. By adjusting the thickness (t), the diameter (Ds), and the amount of protrusion (w) of the inner diameter side of the holding frame 23 provided on the outlet side, the supply passage 21 is formed.
a, the kneaded clay that has passed through the discharge passage 21b is pressed and formed to form the outer peripheral surface 12a of the outer peripheral wall 12f. Unevenness 1
The control of the formation of 2b includes the diameter (Dm) of the masking plate 22, the thickness (t) of the holding frame 23, and the diameter (Dm).
s) and the amount of protrusion (w) on the inner diameter side, and after the firing step of the post-process of the formed body of the ceramic honeycomb structure 12, irregularities are formed in the honeycomb flow direction with a surface roughness of 20 to 500 μmRa.
【００１４】焼成したセラミックハニカム構造体１２に
触媒を担持後、担持部材１３を介し金属容器１１に収納
し、次いで金属容器１１と排気マニホルド１４とを摩擦
圧接することで、図１に示す触媒コンバータ５０と排気
マニホルド５４とが連結した排気系部品が得られる。そ
して、実施の形態のセラミックハニカム構造体１２は、
高温の排気ガスにより金属容器が膨張しても把持部材１
３によるセラミックハニカム構造体１２の把持力は低下
せず、エンジンの振動などによりセラミックハニカム構
造体１２が離動せず、金属容器１１との摩擦による摩耗
が少なくなる。After supporting the catalyst on the fired ceramic honeycomb structure 12, the catalyst is accommodated in a metal container 11 via a supporting member 13, and then the metal container 11 and the exhaust manifold 14 are friction-welded to each other to form a catalytic converter shown in FIG. An exhaust system component in which the exhaust manifold 50 and the exhaust manifold 54 are connected is obtained. And the ceramic honeycomb structure 12 of the embodiment is
Even if the metal container expands due to high-temperature exhaust gas, the holding member 1
3, the gripping force of the ceramic honeycomb structure 12 does not decrease, the ceramic honeycomb structure 12 does not move away due to vibration of the engine or the like, and wear due to friction with the metal container 11 decreases.
【００１５】[0015]
【発明の効果】本発明のセラミックハニカム構造体は、
高温の排気ガスにより金属容器が膨張しても把持部材に
よる把持力が低下せず、例えばエンジンの振動などによ
りセラミックハニカム構造体が離動せず、金属容器との
摩擦による摩耗を少なくできる。The ceramic honeycomb structure of the present invention has the following features.
Even if the metal container expands due to the high-temperature exhaust gas, the gripping force of the gripping member does not decrease. For example, the ceramic honeycomb structure does not separate due to engine vibration or the like, and wear due to friction with the metal container can be reduced.
【図１】実施の形態の、触媒コンバータを排気マニホル
ドに摩擦圧接により圧接部で連結した要部断面図であ
る。FIG. 1 is a cross-sectional view of a main part of an embodiment, in which a catalytic converter is connected to an exhaust manifold at a pressure contact portion by friction welding.
【図２】図１でのセラミックハニカム構造体を示し、
（ａ）はその斜視図、（ｂ）は外周面を拡大した模式図
である。FIG. 2 shows the ceramic honeycomb structure of FIG. 1,
(A) is a perspective view thereof, and (b) is a schematic view in which an outer peripheral surface is enlarged.
【図３】図２での３箇所（１２ａ−ａ、１２ａ−ｂ、１
２ａ−ｃ）に形成した凹凸の一例であり、凹凸を上下方
向のみ変形して示す拡大図である。FIG. 3 shows three positions (12a-a, 12a-b, 1
It is an example of the unevenness | corrugation formed in 2a-c), and is an enlarged view which shows an unevenness | corrugation deformed only in the up-down direction.
【図４】（ａ）はセラミックハニカム構造体の押出成形
後の拡大部分図であり、（ｂ）は押出成形用金型の要部
断面図である。FIG. 4A is an enlarged partial view of a ceramic honeycomb structure after extrusion molding, and FIG. 4B is a cross-sectional view of a main part of an extrusion molding die.
【図５】従来の触媒コンバータを排気マニホルドにボル
トで連結した要部断面図である。FIG. 5 is a sectional view of a main part in which a conventional catalytic converter is connected to an exhaust manifold by bolts.
【図６】図５でのセラミックハニカム構造体を示し、
（ａ）はその斜視図、（ｂ）は外周面を拡大した模式図
である。6 shows the ceramic honeycomb structure of FIG. 5,
(A) is a perspective view thereof, and (b) is a schematic view in which an outer peripheral surface is enlarged.
１０，５０ 触媒コンバータ １１，５１ 金属容器 １２，５２ セラミックハニカム構造体 １２ａ，５２ａ 外周面 １２ｂ 凹凸 １２ｆ 外周壁 １３，５３ 把持部材 １４，５４ 排気マニホルド １６ 圧接部 ２０ 押出成形用金型 ２１ ダイ ２１ａ 供給通路 ２１ｂ 排出通路 ２２ マスキングプレート ２３ 押さえ枠 ５６ ボルト 10, 50 Catalytic converter 11, 51 Metal container 12, 52 Ceramic honeycomb structure 12a, 52a Outer surface 12b Unevenness 12f Outer wall 13, 53 Gripping member 14, 54 Exhaust manifold 16 Press-contact part 20 Extrusion mold 21 Die 21a Supply Passage 21b Discharge passage 22 Masking plate 23 Holding frame 56 Bolt
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 3G091 AA02 AA17 BA09 BA39 GA06 GA16 GB01W GB01X GB01Z GB06W GB10W GB10X GB10Z GB16W GB17X GB17Z HA03 HA26 HA31 4G054 AA06 AB09 AC00 BD19 BD20 4G069 AA01 AA11 CA03 EA26 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3G091 AA02 AA17 BA09 BA39 GA06 GA16 GB01W GB01X GB01Z GB06W GB10W GB10X GB10Z GB16W GB17X GB17Z HA03 HA26 HA31 4G054 AA06 AB09 AC00 BD19 BD20 4G069 AA01 AA11 CA03 EA26
Claims (2)
セラミックハニカム構造体であって、前記セラミックハ
ニカム構造体の外周面に凹凸が形成されていることを特
徴とするセラミックハニカム構造体。1. A ceramic honeycomb structure housed in a metal container via a holding member, wherein the ceramic honeycomb structure has irregularities formed on an outer peripheral surface of the ceramic honeycomb structure.
が５〜５００μｍであることを特徴とするセラミックハ
ニカム構造体。2. The ceramic honeycomb structure according to claim 1, wherein the irregularities have a maximum height of 5 to 500 μm.
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| JP2000151441A JP3979559B2 (en) | 2000-05-23 | 2000-05-23 | Ceramic honeycomb structure |
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| JP2000151441A JP3979559B2 (en) | 2000-05-23 | 2000-05-23 | Ceramic honeycomb structure |
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|---|---|---|---|
| JP2004193532A Division JP2004322095A (en) | 2004-06-30 | 2004-06-30 | Ceramic honeycomb structure |
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| JP2001329836A true JP2001329836A (en) | 2001-11-30 |
| JP3979559B2 JP3979559B2 (en) | 2007-09-19 |
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