JP3401173B2 - Manufacturing method of catalytic converter - Google Patents
Manufacturing method of catalytic converterInfo
- Publication number
- JP3401173B2 JP3401173B2 JP29679997A JP29679997A JP3401173B2 JP 3401173 B2 JP3401173 B2 JP 3401173B2 JP 29679997 A JP29679997 A JP 29679997A JP 29679997 A JP29679997 A JP 29679997A JP 3401173 B2 JP3401173 B2 JP 3401173B2
- Authority
- JP
- Japan
- Prior art keywords
- thickness
- cone
- catalyst carrier
- catalytic converter
- holding portion
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は排気ガス浄化用の触
媒コンバータとその製造方法に関する。
【０００２】
【従来の技術】従来、自動車の排気系に設けられる排気
ガス浄化用の触媒コンバータとして、図７に示すよう
に、セラミック又は金属（メタル）製の触媒担体１０１
を金属製の外筒１０２内に嵌挿し、該外筒１０２の前後
端にプレス成形したコーン１０３，１０４を溶接して構
成したものが例えば実開平２−３９５２２号公報に開示
されている。
【０００３】また、図８に示すように触媒担体２０１
を、プレス成形された半割りのケーシング２０２，２０
３で合わせ被覆するとともに該両ケーシング２０２と２
０３を溶接固着したものが例えば実開平２−６１１２０
号公報に開示されている。
【０００４】
【発明が解決しようとする課題】上記いずれの従来の技
術においても、触媒コンバータを製造するためにはプレ
ス加工と溶接加工を必要とするため、工数がかかり作業
能率が悪くコストも嵩む問題がある。
【０００５】また、上記コーン１０３，１０４及びケー
シング２０２，２０３における排気管との接続部の板厚
は強度上から厚くしたい要求があり、逆に接続部以外の
部分の板厚は、熱容量を小さくして触媒の温度の早期立
ち上がりを妨げないように薄くしたい要求がある。
【０００６】しかし、上記コーン１０３，１０４及びケ
ーシング２０２，２０３をプレス加工により成形するも
のにおいては、その板厚を徐変したり偏肉（厚）するこ
とが困難であることから、上記の両要求を満たすことが
困難な問題がある。
【０００７】そこで本発明は、上記従来の技術に比べて
製造が容易でかつ製造コストを低減でき、更に、上記板
厚の両要求も容易に満たすことができるなど、種々な効
果を有する触媒コンバータとその製造方法を提供するこ
とを目的とするものである。
【０００８】
【課題を解決するための手段】上記の課題を解決するた
めに、本発明は、触媒担体を金属製のケーシングで外包
した触媒コンバータであって、そのケーシングが、触媒
担体の外周部を保持する筒状の保持部と、該保持部の前
後に一体的に形成されたコーン部と、該コーン部の縮径
側先端部に一体形成された接続部とからなり、金属管を
その軸方向に押圧しつつ、コーン部をスピニング加工に
より縮径し、両コーン部の板厚を、その保持部側から接
続部側に至るにつれて徐々に厚くして、コーン部の板厚
を上記保持部の板厚よりも大きくするとともに上記接続
部の板厚ｔ3 と保持部の板厚ｔ1の板厚比を、ｔ3 ／ｔ
1 ＝１．２〜１．９に設定し、更に、前記金属管を、そ
の軸方向に押圧する方法として、金属管の両端部の端面
を回転体によって管軸方向に押圧するようにしたことを
特徴とする触媒コンバータの製造方法である。
【０００９】本発明においては、スピニング加工による
塑性加工のみで触媒担体の保持部とコーン部からなるケ
ーシングを一体形成できる。また、溶接が不要なため、
溶接用のフランジ部が不要になり、材料費の低減、軽量
化が可能になる。更に、触媒担体の保持部の板厚を小さ
くして保持部の熱容量を小さくし、触媒の温度の立ち上
がりを早くして浄化性能を向上させることができるとと
もにコーン部の板厚を大きくして排気管との接続強度を
高めることができる。
【００１０】
【００１１】
【００１２】
【００１３】
【００１４】
【００１５】
【発明の実施の形態】図１乃至図６に示す実施例に基づ
いて本発明の実施の形態について説明する。図１及び図
２は触媒コンバータの第１実施例を示す。
【００１６】触媒コンバータ１に内装される触媒担体２
は、例えば図２に示すように金属製の波板と平板を重ね
てこれらを多重に巻回して形成された金属製触媒担体で
もよく、或いはセラミック製触媒担体でもよい。セラミ
ック製の場合はマットを介して保持してもよい。更に、
これら以外の周知の触媒担体を使用してもよい。また、
該触媒担体１の外形は円筒状に形成されている。
【００１７】上記触媒担体１の外周は金属製のケーシン
グ３で外包され、該ケーシング３は、触媒担体２の外周
に接触して触媒担体２を保持する円筒状の保持部４と、
該保持部４の両端に一体に形成したテーパ状のコーン部
５，６とからなり、そのコーン部５，６は保持部４側か
ら先端に向かって徐々に縮径されている。
【００１８】また、上記保持部４は、その板厚ｔ1 を小
さく設定して熱容量を小さくしており、コーン部５，６
は、その板厚ｔ2 を保持部４から先端に至るにつれて徐
々に厚くして強度を高めている。
【００１９】上記両コーン５，６の縮径側先端部には管
状の接続部７，８が一体形成され、その板厚ｔ3 はコー
ン部５，６の先端肉厚と同等に設定されている。この接
続部７，８の板厚ｔ3 と保持部４の板厚ｔ1 との板厚比
は、ｔ3 ／ｔ1 ＝１．２〜１．９に設定されている。
【００２０】次に、上記実施例の触媒コンバータ１の製
造方法について説明する。先ず図３（ａ）に示すよう
に、所定長に切断された金属管からなる素管３Ａを用意
する。この素管３Ａは、その板厚が上記の保持部４とな
る板厚ｔ1 のもの、すなわち、熱容量の小さい所定の板
厚のものを使用する。更にその素管３Ａの内径は上記触
媒担体２の外径とほぼ同径のものを使用する。更に、素
管３Ａの管長は上記触媒担体２の軸方向長より長く設定
する。
【００２１】次に、図３（ｂ）に示すように、触媒担体
２を上記の素管３Ａ内に一方の開口部から中央部へ挿入
する。次に、上記触媒担体２の挿入状態において、図３
（ｂ）に示すように、素管３Ａを一方向Ａに回転しつつ
スピニング加工工具１０を、素管３Ａにおける両端部５
ａ，６ａの外面に押圧してスピニング加工による塑性加
工によって両端部５ａ，６ａを図３（ｃ）に示すように
コーン状に縮径する。これにより、素管３Ａが、図１に
示すような保持部４とコーン部５，６とを一体成形した
ケーシング３に形成され、その保持部４により触媒担体
２が外脱することなく保持される。
【００２２】また、このスピニング加工時において、図
３（ｄ）に示すように、スピニング加工工具１０の回転
と同時に両端部５ａ，６ａの端面を回転体１１によって
管軸方向（矢印Ｂ方向）に押圧すると、両端部５ａ，６
ａ、すなわち両コーン部５，６の板厚を増肉することが
できる。この増肉時において、回転体１１の押圧力とス
ピニング加工工具１０の押圧力及び押圧量を所望に設定
することにより、両端部５ａ，６ａ、すなわち両コーン
部５，６の板厚の徐変形状や徐変量を任意に設定するこ
とができる。したがって、図１に示すように、保持部４
の板厚ｔ1 を素管３Ａの板厚とし、コーン部５，６の板
厚ｔ2 を徐変し、両接続部７，８の板厚をｔ3 にするこ
とができる。
【００２３】このように製造された図１に示す触媒コン
バータによれば、触媒担体２を保持する保持部４の板厚
ｔ1 を極力小さくして保持部４の熱容量を小さくし、触
媒の温度の立ち上がりを早くし、浄化性能を向上させる
ことができ、かつ接続部７，８の板厚ｔ3 を大きく確保
して排気管１２，１３との接合強度を高めることができ
る。
【００２４】また、コーン部５，６の板厚ｔ2 を徐々に
変化させることにより、応力が集中する箇所（段差等の
急激な板厚の変化部）がなく、強度的に有利な形状とな
る。また、上記の製造方法によれば、素管内に触媒担体
を挿入して素管をスピニング加工するのみで一体ケーシ
ングの触媒コンバータが得られるので、従来のようにプ
レス加工と溶接を用いて製造するものに比べてその製造
が極めて簡単で能率も向上する。更に、溶接用フランジ
部も必要とならないので、材料費の低減、軽量化も可能
になる。
【００２５】図４は触媒コンバータの第２実施例を示
す。本第２実施例は、上記第１実施例における保持部４
と両コーン部５，６の境界部５ｂ，６ｂを、上記触媒担
体２の軸方向の両端部に設定したものである。その他の
構造は上記第１実施例と同様である。
【００２６】本第２実施例によれば、触媒担体２の軸方
向の両端面２ａ，２ｂが境界部５ｂ，６ｂの段部に係止
される。そのため、両コーン部５，６によって触媒担体
２の軸方向の位置決め固定が行え、他の固定手段が不要
になり、製造が容易かつ安価に行える。
【００２７】図５は触媒コンバータの第３実施例を示
す。本第３実施例は、本発明を、異径の触媒担体を複数
個収納した触媒コンバータに適用したもので、大径の触
媒担体２ｃの外周を保持する第１の保持部４ａと、小径
の触媒担体２ｄの外周を保持する第２の保持部４ｃと、
これら両保持部４ａ，４ｃ間を接続するテーパ部４ｂ
と、第１の保持部４ａと第２の保持部４ｃの外端に一体
的に形成したコーン部５ｃ，６ｃと、該コーン部５ｃ，
６ｃの縮径側の先端に一体形成した接続部７ａ，８ａと
からなる。
【００２８】そして、上記の各板厚を４ａ＜４ｂ≦４ｃ
＜５ｃ，６ｃ≦７ａ，８ａの関係に設定され、これらは
上記と同様にスピニング加工により形成されている。
更に、上記テーパ部４ｂ及び両コーン部５ｃ，６ｃの板
厚は、縮径側先端に至るにつれて徐々に厚くして形成さ
れている。
【００２９】本第３実施例においても、上記第１実施例
と同様の作用効果を有する。図６は触媒コンバータの第
４実施例を示す。本第４実施例は、本発明により触媒担
体の保持部とサブマフラ部を一体に形成したものであ
る。
【００３０】すなわち、触媒担体２ｅを保持する保持部
４ｄと、排気管１５の外周部に設けられる共鳴室構成管
４ｅと、保持部４ｄと共鳴室構成管４ｅの外端に設けた
コーン部５ｄ，６ｄと、該コーン部５ｄ，６ｄの縮径側
先端に設けた接続部７ｂ，８ｂを一体に形成したもので
ある。
【００３１】また、上記の各部分の板厚は、４ｅ，４ｄ
＜５ｄ，６ｄ＜７ｂ，８ｂの関係に設定され、これらは
上記と同様にスピニング加工により形成されている。そ
して、上記共鳴室構成管４ｅ内に、φ３の小孔１５ａと
φ１０の開孔１５ｂを形成した排気管１５を貫通状態に
収納するとともに、その小孔１５ａ部の外周に位置して
高周波吸音室１６を形成し、共鳴室構成管４ｅ内に形成
された共鳴空間１７と開孔１５ｂとで共鳴室を形成し
て、これら高周波吸音室１６と共鳴室とによりサブマフ
ラ１８を構成している。本第４実施例においても、上記
第１実施例と同様の作用効果を有する。
【００３２】なお、上記第３及び第４実施例において
も、触媒担体の両端を図１のようにコーン部から離して
もよく、また図４に示すように保持部とコーン部の境界
部に係止するようにしてもよい。
【００３３】
【発明の効果】以上のようであるから本発明によれば、
従来のプレス加工と溶接を用いて製造するものに比べ
て、製造コストと材料費の低減が可能になり、かつ軽量
化も可能になる。更に、触媒担体を保持する保持部の板
厚を小さくして浄化性能を向上させる要求と、接続部の
板厚を大きくして該部の強度を向上させる要求を同時に
満たすことができる。
【００３４】更に、コーン部を徐変させたことにより、
応力集中による折損を防止できる。
【００３５】更に本発明によれば、コーン部の徐変形状
や徐変量を任意に設定でき、触媒コンバータの形状や大
きさに容易に適合させることができる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalytic converter for purifying exhaust gas and a method for producing the same. 2. Description of the Related Art Conventionally, as a catalytic converter for purifying exhaust gas provided in an exhaust system of an automobile, as shown in FIG. 7, a catalyst carrier 101 made of ceramic or metal is used.
Is fitted in a metal outer cylinder 102, and cones 103 and 104 formed by press forming on the front and rear ends of the outer cylinder 102 are welded, for example, disclosed in Japanese Utility Model Laid-Open Publication No. 2-39522. [0003] Further, as shown in FIG.
Are pressed into half casings 202 and 20
3 and the two casings 202 and 2
03 is fixed by welding.
No. 6,086,045. [0004] In any of the above-mentioned prior arts, press working and welding are required to manufacture a catalytic converter, which requires a large number of man-hours, reduces work efficiency, and increases costs. There's a problem. [0005] Further, there is a demand for increasing the thickness of the connection portion between the cones 103 and 104 and the casings 202 and 203 to the exhaust pipe from the viewpoint of strength, and conversely, the thickness of the portion other than the connection portion has a small heat capacity. There is a demand to make the catalyst thin so as not to hinder the early rise of the catalyst temperature. However, in the case where the cones 103 and 104 and the casings 202 and 203 are formed by press working, it is difficult to gradually change the thickness of the plate or to change the thickness (thickness). There is a problem that is difficult to meet the demand. Accordingly, the present invention provides a catalytic converter having various effects, such as easier production and lower production cost as compared with the above-mentioned conventional technology, and furthermore, it is possible to easily satisfy both requirements for the above-mentioned plate thickness. And a method for producing the same. [0008] In order to solve the above-mentioned problems, the present invention provides a catalytic converter in which a catalyst carrier is encased in a metal casing, and the casing comprises an outer peripheral portion of the catalyst carrier. a cylindrical holding portion for holding a cone portion which is integrally formed on the front and back of the holding portion consists integrally formed connecting portion diametrically contracted tip of the cone portion, the metal tube
While pressing in the axial direction, the cone part is reduced in diameter by spinning , and the thickness of both cone parts is gradually increased from the holding part side to the connection part side, and the cone part thickness is the thickness ratio of the thickness t 1 of the holding portion and the thickness t 3 of the connecting portion so as to be larger than the plate thickness of the holding portion, t 3 / t
1 = 1.2 to 1.9, and the metal tube is
As a method of pressing in the axial direction, the end faces of both ends of the metal tube
Is pressed in the tube axis direction by a rotating body . In the present invention, the casing comprising the catalyst carrier holding portion and the cone portion can be integrally formed only by plastic working by spinning. Also, since welding is not required,
The need for a flange for welding is eliminated, and material costs can be reduced and weight can be reduced. Further, the thickness of the holding portion of the catalyst carrier can be reduced to reduce the heat capacity of the holding portion, the temperature of the catalyst can be quickly raised to improve the purification performance, and the thickness of the cone portion can be increased to achieve exhaust. The connection strength with the pipe can be increased. Embodiments of the present invention will be described with reference to the embodiments shown in FIGS. 1 to 6. FIG. 1 and 2 show a first embodiment of the catalytic converter. A catalyst carrier 2 installed in a catalytic converter 1
For example, as shown in FIG. 2, a metal catalyst carrier may be formed by laminating a metal corrugated plate and a flat plate and winding these over and over, or may be a ceramic catalyst carrier. In the case of ceramic, it may be held via a mat. Furthermore,
Other well-known catalyst carriers may be used. Also,
The outer shape of the catalyst carrier 1 is formed in a cylindrical shape. The outer periphery of the catalyst carrier 1 is encased by a metal casing 3, and the casing 3 is in contact with the outer periphery of the catalyst carrier 2 to hold the catalyst carrier 2 in a cylindrical shape.
Tapered cone portions 5 and 6 are integrally formed at both ends of the holding portion 4, and the diameter of the cone portions 5 and 6 is gradually reduced from the holding portion 4 side toward the tip. The holding part 4 has a small heat thickness by setting its plate thickness t 1 to be small.
The thickness t 2 is gradually increased from the holding portion 4 to the tip to increase the strength. Tubular connecting portions 7 and 8 are integrally formed at the distal ends on the reduced diameter side of the cones 5 and 6, and the plate thickness t 3 is set to be equal to the thickness of the distal ends of the cone portions 5 and 6. I have. The plate thickness ratio between the plate thickness t 3 of the connecting portions 7 and 8 and the plate thickness t 1 of the holding portion 4 is set to t 3 / t 1 = 1.2 to 1.9. Next, a method of manufacturing the catalytic converter 1 of the above embodiment will be described. First, as shown in FIG. 3A, a raw tube 3A made of a metal tube cut to a predetermined length is prepared. The base pipe 3A is itself plate thickness of the plate thickness t 1 of the holding portion 4 described above, i.e., to use a predetermined thickness smaller heat capacity. Further, the inner diameter of the base tube 3A is substantially the same as the outer diameter of the catalyst carrier 2. Further, the tube length of the raw tube 3A is set longer than the axial length of the catalyst carrier 2. Next, as shown in FIG. 3 (b), the catalyst carrier 2 is inserted from one opening into the center of the raw tube 3A. Next, in the inserted state of the catalyst carrier 2, FIG.
As shown in (b), while rotating the raw tube 3A in one direction A, the spinning tool 10 is moved to both ends 5 of the raw tube 3A.
Both ends 5a, 6a are reduced in a cone shape as shown in FIG. 3 (c) by plastic working by spinning by pressing against the outer surfaces of a, 6a. Thereby, the raw tube 3A is formed in the casing 3 integrally formed with the holding portion 4 and the cone portions 5 and 6 as shown in FIG. 1, and the catalyst carrier 2 is held by the holding portion 4 without coming off. You. At the time of this spinning, as shown in FIG. 3D, the end faces of both ends 5a and 6a are simultaneously rotated by the rotating body 11 in the pipe axis direction (direction of arrow B) as shown in FIG. When pressed, both ends 5a, 6
a, that is, the thickness of both cone portions 5, 6 can be increased. During this thickening, the pressing force of the rotating body 11 and the pressing force and pressing amount of the spinning tool 10 are set as desired, so that the plate thickness of both end portions 5a, 6a, that is, the thickness of both cone portions 5, 6 gradually changes. The shape and the amount of gradual change can be set arbitrarily. Therefore, as shown in FIG.
The plate thickness t 1 and the thickness of the mother tube 3A, and gradually changing the thickness t 2 of the cone portion 5 and 6, the plate thickness of both the connecting portions 7 and 8 can be t 3. According to the thus-produced catalytic converter shown in FIG. 1, the plate thickness t 1 of the holding portion 4 holding the catalyst carrier 2 is made as small as possible, so that the heat capacity of the holding portion 4 is reduced, and the temperature of the catalyst is reduced. , The purification performance can be improved, and the thickness t 3 of the connection portions 7 and 8 can be increased to increase the bonding strength with the exhaust pipes 12 and 13. Further, by gradually changing the plate thickness t 2 of the cone portions 5 and 6, there is no place where stress is concentrated (a portion where the plate thickness changes suddenly such as a step), and a shape advantageous in strength is obtained. Become. In addition, according to the above-described manufacturing method, a catalyst converter having an integral casing can be obtained only by inserting a catalyst carrier into the raw tube and spinning the raw tube, so that the manufacturing is performed using conventional press working and welding. Its manufacture is much simpler and more efficient than the ones. Furthermore, since a welding flange is not required, the material cost can be reduced and the weight can be reduced. FIG. 4 shows a second embodiment of the catalytic converter. The second embodiment is different from the first embodiment in that the holding unit 4
The boundary portions 5b and 6b between the two cone portions 5 and 6 are set at both ends in the axial direction of the catalyst carrier 2. Other structures are the same as in the first embodiment. According to the second embodiment, both end surfaces 2a, 2b in the axial direction of the catalyst carrier 2 are locked to the steps of the boundary portions 5b, 6b. For this reason, the positioning and fixing of the catalyst carrier 2 in the axial direction can be performed by the two cone portions 5 and 6, and other fixing means are not required, and the manufacturing can be performed easily and at low cost. FIG. 5 shows a third embodiment of the catalytic converter. In the third embodiment, the present invention is applied to a catalytic converter accommodating a plurality of catalyst carriers of different diameters, and comprises a first holding portion 4a for holding the outer periphery of a large-diameter catalyst carrier 2c and a small-diameter catalyst carrier 2c. A second holding portion 4c for holding an outer periphery of the catalyst carrier 2d,
Tapered part 4b connecting between these two holding parts 4a, 4c
And cone portions 5c, 6c integrally formed on outer ends of the first holding portion 4a and the second holding portion 4c;
6c and connecting portions 7a and 8a integrally formed at the distal end on the reduced diameter side. Then, each of the above plate thicknesses is set to 4a <4b ≦ 4c.
<5c, 6c ≦ 7a, 8a are set, and these are formed by spinning in the same manner as described above.
Further, the plate thickness of the tapered portion 4b and the two cone portions 5c and 6c is formed so as to gradually increase toward the tip on the diameter reducing side. The third embodiment has the same function and effect as the first embodiment. FIG. 6 shows a fourth embodiment of the catalytic converter. In the fourth embodiment, the holding portion of the catalyst carrier and the sub-muffler portion are integrally formed according to the present invention. That is, a holding portion 4d for holding the catalyst carrier 2e, a resonance chamber forming tube 4e provided on the outer peripheral portion of the exhaust pipe 15, and a cone portion 5d provided on the outer end of the holding portion 4d and the resonance chamber forming tube 4e. , 6d and connecting portions 7b, 8b provided at the distal end of the cone portions 5d, 6d on the reduced diameter side. The thickness of each of the above portions is 4e, 4d
<5d, 6d <7b, 8b, which are formed by spinning in the same manner as described above. The exhaust pipe 15 having the small hole 15a of φ3 and the opening 15b of φ10 is housed in the resonance chamber constituting pipe 4e in a penetrating state, and is located at the outer periphery of the small hole 15a. A resonance chamber is formed by the resonance space 17 and the opening 15b formed in the resonance chamber constituting tube 4e, and a sub-muffler 18 is formed by the high frequency sound absorbing chamber 16 and the resonance chamber. The fourth embodiment also has the same functions and effects as the first embodiment. In the third and fourth embodiments as well, both ends of the catalyst carrier may be separated from the cone as shown in FIG. 1, or the boundary between the holding portion and the cone may be formed as shown in FIG. You may make it lock. As described above, according to the present invention ,
Compared with the conventional manufacturing method using press working and welding, the manufacturing cost and material cost can be reduced, and the weight can be reduced. Further, it is possible to simultaneously satisfy the requirement to improve the purification performance by reducing the plate thickness of the holding portion for holding the catalyst carrier and the requirement to increase the plate thickness of the connecting portion to improve the strength of the portion. [0034] Further, by which it was gradually changing the cone portion,
Breakage due to stress concentration can be prevented. Further , according to the present invention, it is possible to arbitrarily set the gradual deformation shape and gradual change amount of the cone portion, and it is possible to easily adapt the shape and size of the catalytic converter.
【図面の簡単な説明】
【図１】本発明の触媒コンバータの第１実施例を示す側
断面図。
【図２】図１のＸ−Ｘ線断面図。
【図３】（ａ）〜（ｄ）は本発明の触媒コンバータの製
造工程の実施例を示す各略断面図。
【図４】本発明の触媒コンバータの第２実施例を示す側
断面図。
【図５】本発明の触媒コンバータの第３実施例を示す側
断面図。
【図６】本発明の触媒コンバータの第４実施例を示す側
断面図。
【図７】従来の触媒コンバータを示す側断面図。
【図８】従来の触媒コンバータの他の例を示す側断面
図。
【符号の説明】
１…触媒コンバータ ２…触媒担体
３…ケーシング ４…保持部
５，６…コーン部 ７，８…接続部
１０…スピニング加工工具 １１…押圧する回
転体BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing a first embodiment of a catalytic converter according to the present invention. FIG. 2 is a sectional view taken along line XX of FIG. FIGS. 3A to 3D are schematic cross-sectional views showing an embodiment of a manufacturing process of the catalytic converter of the present invention. FIG. 4 is a side sectional view showing a second embodiment of the catalytic converter of the present invention. FIG. 5 is a side sectional view showing a third embodiment of the catalytic converter of the present invention. FIG. 6 is a side sectional view showing a fourth embodiment of the catalytic converter of the present invention. FIG. 7 is a side sectional view showing a conventional catalytic converter. FIG. 8 is a side sectional view showing another example of a conventional catalytic converter. [Description of Signs] 1 ... catalyst converter 2 ... catalyst carrier 3 ... casing 4 ... holding part 5,6 ... cone part 7,8 ... connecting part 10 ... spinning tool 11 ... rotating body to press
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平９−112259（ＪＰ，Ａ) 特開 昭48−55173（ＪＰ，Ａ) 特開 平８−196917（ＪＰ，Ａ) 特開 昭57−103740（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) F01N 3/28 F01N 7/18 B21D 41/00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-9-112259 (JP, A) JP-A-48-173173 (JP, A) JP-A-8-196917 (JP, A) JP-A 57-112 103740 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) F01N 3/28 F01N 7/18 B21D 41/00
Claims (1)
た触媒コンバータであって、そのケーシングが、触媒担
体の外周部を保持する筒状の保持部と、該保持部の前後
に一体的に形成されたコーン部と、該コーン部の縮径側
先端部に一体形成された接続部とからなり、金属管をそ
の軸方向に押圧しつつ、コーン部をスピニング加工によ
り縮径し、両コーン部の板厚を、その保持部側から接続
部側に至るにつれて徐々に厚くして、コーン部の板厚を
上記保持部の板厚よりも大きくするとともに上記接続部
の板厚ｔ3 と保持部の板厚ｔ1 の板厚比を、ｔ3 ／ｔ1
＝１．２〜１．９に設定し、更に、前記金属管を、その
軸方向に押圧する方法として、金属管の両端部の端面を
回転体によって管軸方向に押圧するようにしたことを特
徴とする触媒コンバータの製造方法。(57) [Claim 1] A catalytic converter in which a catalyst carrier is encased in a metal casing, the casing comprising: a cylindrical holding portion for holding an outer peripheral portion of the catalyst carrier; a cone portion which is integrally formed on the front and back of the holding portion consists of a connecting portion integrally formed on the diametrically contracted tip of the cone portion, its metal tube
While pressing in the axial direction, the cone part is reduced in diameter by spinning , and the thickness of both cone parts is gradually increased from the holding part side to the connection part side, and the thickness of the cone part is above the thickness ratio of the thickness t 1 of the holding portion and the thickness t 3 of the connecting portion so as to be larger than the plate thickness of the holding portion, t 3 / t 1
= 1.2 to 1.9, and the metal tube is
As a method of pressing in the axial direction, the end faces of both ends of the metal tube are
A method for manufacturing a catalytic converter, characterized in that a rotary body is pressed in a tube axis direction .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29679997A JP3401173B2 (en) | 1997-10-29 | 1997-10-29 | Manufacturing method of catalytic converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29679997A JP3401173B2 (en) | 1997-10-29 | 1997-10-29 | Manufacturing method of catalytic converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11132038A JPH11132038A (en) | 1999-05-18 |
| JP3401173B2 true JP3401173B2 (en) | 2003-04-28 |
Family
ID=17838299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29679997A Expired - Lifetime JP3401173B2 (en) | 1997-10-29 | 1997-10-29 | Manufacturing method of catalytic converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3401173B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6701617B2 (en) * | 2002-08-06 | 2004-03-09 | Visteon Global Technologies, Inc. | Spin-forming method for making catalytic converter |
| JP2009195913A (en) * | 2008-02-19 | 2009-09-03 | Nisshin Steel Co Ltd | Spinning method |
| JP2009195941A (en) * | 2008-02-21 | 2009-09-03 | Nisshin Steel Co Ltd | Spinning method |
| US8683843B2 (en) | 2008-04-15 | 2014-04-01 | Nisshin Steel Co., Ltd. | Spinning method for forming pipe end |
| JP6982409B2 (en) * | 2017-05-31 | 2021-12-17 | 株式会社Subaru | Exhaust gas purification device |
| CN115722869A (en) * | 2021-08-27 | 2023-03-03 | 佛吉亚排气控制技术开发(上海）有限公司 | Mixer manufacturing method and mixer |
-
1997
- 1997-10-29 JP JP29679997A patent/JP3401173B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11132038A (en) | 1999-05-18 |
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