JP4142964B2 - Catalytic converter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a catalytic converter in which a catalyst carrier body is press-fitted in a catalyst carrier case.
[0002]
[Prior art]
Generally, as shown in FIG. 12 (see, for example, Patent Document 1), the catalytic converter 50 includes a cylindrical catalyst carrier case 51 and a catalyst carrier body 52 press-fitted into the catalyst carrier case 51. ing. The catalyst carrier main body 52 is a honeycomb structure formed by, for example, winding a strip-shaped corrugated plate (not shown) and a strip-shaped flat plate (not shown) in an overlapped state. A tapered surface 53 is formed on the inner surfaces of the opening portions at both ends of the catalyst carrier case 51 so as to incline toward the inner back side.
[0003]
In order to press-fit such a catalyst carrier body 52 into the catalyst carrier case 51, the following method is used. In this method, as shown in FIG. 13, a guide member 54 having a cylindrical shape larger in diameter than the catalyst carrier case 51 and having a structure that can be installed at the open end of the catalyst carrier case 51 is used. A guide surface 54 a that is inclined toward the back toward the center is formed around the upper end of the guide member 54.
[0004]
First, the catalytic converter 52 is inserted into the guide member 54. When installed in this way, even if the center of the catalytic converter 52 and the center position of the catalyst carrier case 51 are slightly deviated from each other, the leading end surface 52a of the catalytic converter 52 is guided by the guide surface 54a of the guide member 54 so that it can be smoothly inserted. Is done. As the insertion of the catalytic converter 52 proceeds, the catalytic converter 52 is gradually inserted while receiving a compressive force from the guide surface 54a. The leading end surface 52 a of the catalytic converter 52 moves from the guide surface 54 a of the guide member 54 to the tapered surface 53 of the catalyst carrier case 51, and thereafter inserted into the catalyst carrier case 51 while receiving the compressive force from the catalyst carrier case 51. Is done.
[0005]
By the way, as shown in FIG. 14, the maximum radius R1 of the taper surface 53 of the catalyst carrier case 51 is the same as the minimum radius R2 of the guide surface 54a of the guide member 54, that is, the guide surface 54a of the guide member 54 and the catalyst carrier. It is theoretically preferable that the tapered surface 53 of the case 51 is formed as a continuous surface without a step. However, since an error of about 0.2 mm occurs in the maximum radius R1 of the tapered surface 53 and a shift occurs in the fitted state between the guide member 54 and the catalyst carrier case 51, the maximum radius R1 of the tapered surface 53 and It is practically difficult to set the minimum radius R2 of the guide surface 54a of the guide member 54 to the same size. Here, if the maximum radius R1 of the taper surface 53 of the catalyst carrier case 51 is smaller than the minimum radius R2 of the guide surface 54a of the guide member 54, the outer peripheral portion of the front end surface 52a of the catalyst converter 52 becomes the end surface 51b of the catalyst carrier case 51. At the end, there is a problem that the catalytic converter 52 is plastically deformed by this interference, or a foil brazing material (not shown) bonded to the catalytic converter 52 is peeled off.
[0006]
Conventionally, as a measure, even when the above-described error exists, the maximum radius R1 of the tapered surface 53 of the catalyst carrier case 51 is made not to be smaller than the minimum radius R2 of the guide surface 54a of the guide member 54. Therefore, the maximum radius R1 of the tapered surface 53 of the catalyst carrier case 51 is normally set larger than the minimum radius R2 of the guide surface 54a of the guide member 54, as shown in FIG. With such a configuration, the outer peripheral portion of the front end surface 52a of the catalytic converter 52 is prevented from abutting against the end surface 51b of the catalyst carrier case 51 to prevent plastic deformation of the catalytic converter 52 and peeling of the foil brazing material. .
[0007]
[Patent Document 1]
Utility Model Registration No. 578918 Publication
[Problems to be solved by the invention]
However, if the maximum radius R1 of the taper surface 53 of the catalyst carrier case 51 is larger than the minimum radius R2 of the guide surface 54a of the guide member 54, the inconvenience described below occurs. That is, when the catalytic converter 52 is guided by the guide surface 54a of the guide member 54, the catalytic converter 52 receives a compressive force from the guide surface 54a toward the center, and is released immediately after the compressive force passes through the guide surface 54a. Will be. Then, the outer peripheral part of the catalytic converter 52 spreads outward, and in this spread state, it strikes the tapered surface 53 of the catalyst carrier case 51, so that a situation occurs in which the contact is made at an angle that is almost perpendicular. When the catalytic converter 52 hits the taper surface 53 of the catalyst carrier case 51 at such an angle, plastic deformation of the catalytic converter 52 or peeling of a brazing filler metal (not shown) occurs. That is, the same problem as when the maximum radius R1 of the tapered surface 53 of the catalyst carrier case 51 is smaller than the minimum radius R2 of the guide surface 54a of the guide member 54 occurs.
[0009]
In addition, since the guide member 54 is used in the press-fitting of the catalytic converter 52 described above, the guide member 54 is installed to press-fit the catalytic converter 52, and after the press-fitting of the catalytic converter 52 is finished, the installed guide member 54 is installed. It was necessary to remove it, and the work was troublesome.
[0010]
Therefore, the present invention provides a catalytic converter that can smoothly press-fit the catalyst carrier body without using a guide member and without causing inconveniences such as plastic deformation of the catalyst carrier body and peeling of the foil brazing material. Objective.
[0011]
[Means for Solving the Problems]
According to the first aspect of the present invention, in the catalytic converter in which the catalyst carrier body is press-fitted into the cylindrical catalyst carrier case, the inner surface of at least one open end of the catalyst carrier case is expanded toward the open end surface. A plurality of continuous taper surfaces that are open and have different taper angles are provided.
[0012]
The invention according to claim 2 is the catalytic converter according to claim 1, wherein the taper angle of the tapered surface located on the opening end surface side among the continuous tapered surfaces is the taper of the tapered surface located on the inner side in the cylinder. It is characterized by being set smaller than the angle.
[0013]
The invention according to claim 3 is the catalytic converter according to claim 2, wherein there are two tapered surfaces, and the taper angle of the tapered surface located on the opening end surface side is set within 30 degrees, The taper angle of the tapered surface located on the side is set within 45 degrees.
[0014]
According to a fourth aspect of the present invention, in the catalytic converter according to the first aspect, the taper angle of the tapered surface located on the opening end surface side among the continuous tapered surfaces is the taper of the tapered surface located on the inner side in the cylinder. It is characterized by being set larger than the angle.
[0015]
The invention according to claim 5 is the catalytic converter according to claim 4, wherein there are two tapered surfaces, and the taper angle of the tapered surface located on the inner side in the cylinder is set within 30 degrees, and the opening end surface The taper angle of the tapered surface located on the side is set within 45 degrees.
[0016]
A sixth aspect of the present invention is the catalytic converter according to any one of the first to fifth aspects, wherein the tapered surfaces are provided at both ends of the catalyst carrier case. To do.
[0017]
【The invention's effect】
According to the first aspect of the present invention, when the catalyst carrier body is press-fitted into the inside from one end side of the catalyst carrier case, the front end surface of the catalyst carrier body is guided to the taper surfaces of all stages on the inner surface of the end portion of the catalyst carrier case. Will be. Therefore, the catalyst carrier body can be smoothly press-fitted without using a guide member and without causing plastic deformation of the catalyst carrier body and peeling of the foil brazing material. Further, since the press-fitting stroke of the catalyst carrier body is shortened as compared with the case where a conventional guide member is used, the distance that the foil brazing material slides on the inner surface of the catalyst carrier case is shortened. Therefore, the catalyst carrier body can be easily press-fitted, and displacement of the catalyst carrier body can be prevented.
[0018]
According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the end portion of the catalyst carrier body press-fitted into the catalyst carrier case has two steps between the inner surface of the catalyst carrier case. Since the gap is formed by the taper surface, the brazing filler metal located in the gap does not rise during heat treatment and accumulates in the gap, and the accumulated foil brazing material contributes to the joining of the catalyst carrier body and the catalyst carrier case. . Therefore, the bonding strength between the catalyst carrier body and the catalyst carrier case is improved. In particular, a wide-angle gap is formed between the outer peripheral surface of the catalyst carrier body and the taper surface on the back side of the catalyst carrier case, so that it is possible to effectively prevent the rising due to the capillary phenomenon, and to secure many foil brazing materials. It can be made to remain in a clearance, and it can have sufficient joining strength of a catalyst support body and a catalyst support case.
[0019]
In addition, since the outer peripheral surface of the catalyst carrier body and the two-step tapered surface of the catalyst carrier case are partly joined with the foil brazing material but not in most other areas, the end of the catalyst carrier body The part contributes to stress relaxation. In particular, since there is a wide-angle gap between the outer peripheral surface of the catalyst carrier body and the tapered surface on the back side of the catalyst carrier case, the end of the catalyst carrier body is not joined over a wide range, and the catalyst carrier body The end portion of this contributes effectively to stress relaxation.
[0020]
According to the invention described in claim 3, in addition to the effect of the invention described in claim 2, since the maximum taper angle is within 45 degrees, the compression force from the taper surface to the catalyst carrier body does not increase more than necessary during press-fitting. . Accordingly, smooth press-fitting of the catalyst carrier main body can be realized without causing plastic deformation of the catalyst carrier main body and peeling of the foil brazing material.
[0021]
According to the invention described in claim 4, in addition to the effect of the invention described in claim 1, the end portion of the catalyst carrier body press-fitted into the catalyst carrier case has two steps between the inner surface of the catalyst carrier case. Since the gap is formed by the taper surface, the brazing filler metal located in the gap does not rise during heat treatment and accumulates in the gap, and the accumulated foil brazing material contributes to the joining of the catalyst carrier body and the catalyst carrier case. . Therefore, the bonding strength between the catalyst carrier body and the catalyst carrier case is improved. In addition, since the outer peripheral surface of the catalyst carrier body and the two-step tapered surface of the catalyst carrier case are partly joined with the foil brazing material but not in most other areas, the end of the catalyst carrier body The part contributes to stress relaxation.
[0022]
According to the invention described in claim 5, in addition to the effect of the invention described in claim 4, since the maximum taper angle is within 45 degrees, the compression force from the taper surface to the catalyst carrier body does not increase more than necessary during press-fitting. . Accordingly, smooth press-fitting of the catalyst carrier main body can be realized without causing plastic deformation of the catalyst carrier main body and peeling of the foil brazing material.
[0023]
According to the invention described in claim 6, in addition to the effects of the invention described in claims 1-5, the catalyst carrier body can be press-fitted from both ends of the catalyst carrier case. Therefore, press-fit workability is improved.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0025]
1 to 10 show an embodiment of a catalytic converter according to the present invention. 1 is a cross-sectional view of the catalytic converter 1, FIG. 2 is an enlarged view of a portion A in FIG. 1, FIG. 3 is a cross-sectional view showing a press-fitting start state of the catalyst carrier body 3, and FIG. 3a is an enlarged cross-sectional view of a main part showing a state in which 3a is in contact with the tapered surface 5 on the inlet side of the catalyst carrier case 2. FIG. 5 is a cross-sectional view showing a state in which the catalyst carrier body 3 is completely press-fitted into the catalyst carrier case 2. 6 is an enlarged view of part B in FIG. 5, FIG. 7 is a cross-sectional view showing the state before the heat treatment of the catalyst carrier case 2 and the catalyst carrier body 3, and FIG. 8 is an enlarged view of part C in FIG. 9 is a sectional view showing a state after the heat treatment of the catalyst carrier case 2 and the catalyst carrier body 3, and FIG. 10 is an enlarged view of a portion D of FIG.
[0026]
As shown in FIG. 1, the catalytic converter 1 includes a catalyst carrier case 2 and a catalyst carrier body 3 press-fitted into the catalyst carrier case 2. The catalyst carrier case 2 has a cylindrical shape with both end faces opened, and a columnar carrier accommodation area surrounded by the inner peripheral surface 4 is formed. As shown in an enlarged view in FIG. 2, the inner peripheral surface 4 of the opening at both ends of the catalyst carrier case 2 expands toward the inlet opening end surface and has two continuous tapers with different taper angles α1 and α2. Surfaces 5 and 6 are formed. The taper angles α1 and α2 of the continuous taper surfaces 5 and 6 are set so that the taper surface 5 on the inlet side is smaller and the taper surface 6 on the back side is larger. Specifically, the taper angle α1 of the taper surface 5 on the inlet side is set within 30 degrees with respect to the inner peripheral surface 4, and the taper angle α2 of the taper surface 6 on the back side is set with respect to the inner peripheral surface 4. Is set to be larger than 30 degrees and within 45 degrees.
[0027]
The catalyst carrier body 3 is a honeycomb structure formed by, for example, winding a strip-shaped corrugated plate (not shown) and a strip-shaped flat plate (not shown) in a spiral shape.
[0028]
Next, a procedure for press-fitting the catalyst carrier body 3 into the catalyst carrier case 2 will be described. As shown in FIG. 3, on the outer peripheral surface of the catalyst carrier body 3, a foil brazing material 10 is provided over the entire circumference in a portion near one end.
[0029]
First, as shown in FIG. 3, the end surface on the side far from the portion to which the brazing filler metal 10 is bonded is the insertion tip surface 3a, and the direction of arrow P in FIG. Insert in 2. Then, as shown in FIG. 4, the outer peripheral portion of the insertion tip surface 3 a of the catalyst carrier body 3 comes into contact with the tapered surface 5 on the inlet side of the catalyst carrier case 2. Even if the center of the catalyst carrier body 3 and the center position of the catalyst carrier case 2 are slightly deviated, the leading end surface 3a of the catalyst carrier body 3 is smoothly inserted by being guided by the tapered surface 5 on the inlet side of the catalyst carrier case 2. Is done.
[0030]
As the insertion of the catalyst carrier body 3 proceeds, the catalyst carrier body 3 is gradually inserted while receiving a compressive force (stress) from the tapered surface 5. The guide portion of the tip surface 3a of the catalyst carrier body 3 shifts from the tapered surface 5 on the inlet side to the tapered surface 6 on the back side, and thereafter the catalyst carrier case while receiving the compressive force from the tapered surface 6 on the back side. 2 is gradually inserted. Here, since the taper surface 5 on the inlet side and the taper surface 6 on the back side are continuous surfaces, the catalyst carrier body 3 is similar to the conventional example with respect to the taper surface 6 at the time of transition between both the taper surfaces 5 and 6. The guide is received without contact at an angle close to vertical. Then, as shown in FIGS. 5 and 6, the press-fitting is finished when the catalyst carrier body 3 is completely accommodated in the catalyst carrier case 2.
[0031]
Next, as shown in FIGS. 7 and 8, the catalyst carrier case 2 into which the catalyst carrier body 3 is press-fitted is disposed upside down. Thereby, the part which adhered the brazing filler metal 10 of the catalyst support body 3 is positioned on the lower side.
[0032]
Next, in a state where the foil brazing material 10 of the catalyst carrier body 3 is in the lower position, heat treatment is performed to join the catalyst carrier body 3 and braze the catalyst carrier body 3 and the catalyst carrier case 2 with the foil brazing material 10. By this heat treatment, the foil brazing material 10 positioned above the two-step tapered surfaces 5 and 6 of the catalyst carrier case 2 causes the outer peripheral surface of the catalyst carrier main body 3 and the catalyst carrier case 2 to move as shown in FIGS. A small gap with the inner peripheral surface 4 of the metal is brazed by capillary action, and the catalyst carrier body 3 and the catalyst carrier case 2 are joined by the brazed foil brazing material 10. Further, as shown in FIG. 10, the excess brazing filler metal 10 located at a position facing the two-step tapered surfaces 5 and 6 of the catalyst carrier case 2 is formed by a gap 11 formed by the tapered surfaces 5 and 6. During the heat treatment, the foil brazing material 10a does not rise but accumulates in the gap, and the accumulated foil brazing material 10a contributes to the joining of the catalyst carrier body 3 and the catalyst carrier case 2.
[0033]
As described above, in the catalytic converter 1, when the catalyst carrier body 3 is press-fitted into the inside from one end side of the catalyst carrier case 2, the front end surface 3 a of the catalyst carrier body 3 is two-stage continuous with the inner surface of the end portion of the catalyst carrier case 2. It is press-fitted by being guided by the tapered surfaces 5 and 6 that are to be moved. Therefore, the catalyst carrier body 3 can be smoothly press-fitted without using a guide member as in the conventional example, and without causing plastic deformation of the catalyst carrier body 3 or peeling of the foil brazing material 10. Further, since the press-fitting stroke of the catalyst carrier body 3 is shortened as compared with the case of using a guide member as in the conventional example, the distance that the foil brazing material 10 slides on the inner surface of the catalyst carrier case 2 is shortened. Therefore, the catalyst carrier body 3 can be easily press-fitted and the displacement of the catalyst carrier body 3 can be prevented.
[0034]
In the above embodiment, the taper angles α1 and α2 of the two-step tapered surfaces 5 and 6 are set so that the tapered surface 5 on the inlet side is smaller and the tapered surface 6 on the back side is larger. As a result, a gap 11 is formed at the end of the catalyst carrier body 3 press-fitted into the catalyst carrier case 2 with the two-step tapered surfaces 5 and 6 between the inner surface of the catalyst carrier case 2 and the gap 11 The brazing filler metal 10 located in the position does not rise in the heat treatment but accumulates in the gap 11, and the accumulated brazing filler metal 10 a contributes to the joining of the catalyst carrier body 3 and the catalyst carrier case 2. Therefore, the bonding strength between the catalyst carrier body 3 and the catalyst carrier case 2 is improved. In particular, in this embodiment, since a wide-angle gap 11 is formed between the outer peripheral surface of the catalyst carrier body 3 and the tapered surface 6 on the back side of the catalyst carrier case 2, it is possible to effectively prevent the rising due to the capillary phenomenon. Thus, the excess amount of the brazing filler metal 10 can be reliably retained in the gap 11, and the bonding strength between the catalyst carrier body 3 and the catalyst carrier case 2 can be sufficiently provided.
[0035]
Further, since the end portion of the catalyst carrier body 3 and the two-step tapered surfaces 5 and 6 of the catalyst carrier case 2 are partly joined by the foil brazing material 10, they are not joined in most other areas. The end of the catalyst carrier body 3 contributes to stress relaxation. In particular, since a wide-angle gap 11 is formed between the outer peripheral surface of the catalyst carrier body 3 and the tapered surface 6 on the back side of the catalyst carrier case 2, the end portion of the catalyst carrier body 3 is joined over a wide range. In other words, the end of the catalyst carrier body 3 contributes effectively to stress relaxation.
[0036]
Furthermore, in the above embodiment, the maximum taper angle of the two-step tapered surfaces 5 and 6 is set within 45 degrees. Therefore, the compression force from the taper surfaces 5 and 6 with respect to the catalyst carrier body 3 at the time of press-fitting does not increase more than necessary. Therefore, smooth press-fitting of the catalyst carrier main body 3 can be realized without causing plastic deformation of the catalyst carrier main body 3 and peeling of the foil brazing material.
[0037]
In the above embodiment, since the two-step tapered surfaces 5 and 6 are provided on both ends of the catalyst carrier case 2, the catalyst carrier body 3 can be press-fitted from both ends of the catalyst carrier case 2. Therefore, press-fit workability is good.
[0038]
Next, a modification of the present embodiment will be described. FIG. 11 is an enlarged cross-sectional view of the main parts of the catalyst carrier case 2 and the catalyst carrier body 3 showing a modification of the above embodiment. As shown in FIG. 11, in this modified example, the taper angles α1 and α2 of the two-step taper surfaces 5 and 6 are larger on the inlet-side taper surface 5, contrary to the above-described embodiment. The tapered surface 6 is set smaller. Specifically, the taper angle α2 of the taper surface 6 on the back side is set within 30 degrees with respect to the inner peripheral surface 4, and the taper angle α1 of the taper surface 5 on the inlet side is relative to the inner peripheral surface 4 Is set to be larger than 30 degrees and within 45 degrees.
[0039]
Since other configurations are the same as those of the above-described embodiment, description thereof is omitted.
[0040]
Also in this modification, when the catalyst carrier body 3 is press-fitted into the inside from one end side of the catalyst carrier case 2, the two-step continuous taper where the tip surface 3 a of the catalyst carrier body 3 is on the inner surface of the end portion of the catalyst carrier case 2. It is press-fitted by being guided by the surfaces 5 and 6. Therefore, the catalyst carrier main body 3 can be press-fitted without using a guide member as in the conventional example, and without causing plastic deformation of the catalyst carrier main body 3 and peeling of the foil brazing material 10.
[0041]
Further, since the gap 11 is formed at the end of the catalyst carrier body 3 press-fitted into the catalyst carrier case 2 by the two-step tapered surfaces 5 and 6 between the inner surface 4 of the catalyst carrier case 2 and the gap 11. The brazing filler metal 10 located in the position does not rise in the heat treatment but accumulates in the gap, and the accumulated brazing filler metal 10 a contributes to the joining of the catalyst carrier body 3 and the catalyst carrier case 2. Therefore, the bonding strength between the catalyst carrier body 3 and the catalyst carrier case 2 is improved. Further, since the end portion of the catalyst carrier body 3 and the two-step tapered surfaces 5 and 6 of the catalyst carrier case 2 are partly joined by the foil brazing material 10, they are not joined in most other areas. The end of the catalyst carrier body 3 contributes to stress relaxation.
[0042]
Further, since the two-step tapered surfaces 5 and 6 have a maximum taper angle of 45 degrees or less, the compressive force from the tapered surfaces 5 and 6 on the catalyst carrier body 3 does not increase more than necessary during press-fitting. Therefore, smooth press-fitting of the catalyst carrier body 3 can be realized without causing plastic deformation of the catalyst carrier body 3 and peeling of the foil brazing material 10.
[0043]
In addition, according to the said embodiment, although the catalyst carrier case 2 is formed in the cylindrical shape, an elliptical (ellipse) shape may be sufficient, and other shapes may be sufficient as it.
[Brief description of the drawings]
FIG. 1 is a sectional view of a catalytic converter according to an embodiment of the present invention.
2 shows an embodiment of the present invention and is an enlarged view of part A in FIG.
FIG. 3 is a sectional view showing an embodiment of the present invention and showing a press-fitting start state of a catalyst carrier body.
FIG. 4 is an enlarged cross-sectional view of a main part showing the embodiment of the present invention and showing a state in which a front end surface of a catalyst carrier body is in contact with a tapered surface on the inlet side of a catalyst carrier case.
FIG. 5 is a sectional view showing an embodiment of the present invention and showing a state in which a catalyst carrier body is completely press-fitted into a catalyst carrier case.
6 shows an embodiment of the present invention and is an enlarged view of a portion B in FIG.
FIG. 7 is a cross-sectional view showing an embodiment of the present invention, in which a catalyst carrier case and a catalyst carrier main body are turned upside down and a state before heat treatment is shown.
FIG. 8 shows an embodiment of the present invention and is an enlarged view of a portion C in FIG.
FIG. 9 is a cross-sectional view showing a state after the heat treatment of the catalyst carrier case and the catalyst carrier body according to the embodiment of the present invention.
10 shows an embodiment of the present invention and is an enlarged view of a portion D in FIG. 9. FIG.
FIG. 11 is an enlarged cross-sectional view of a main part of a catalyst carrier case and a catalyst carrier body showing a modification of the embodiment.
FIG. 12 is a cross-sectional view of a conventional catalytic converter.
FIG. 13 is a cross-sectional view showing a press-fitting start state of a conventional catalyst carrier body.
FIG. 14 is an enlarged cross-sectional view of a main part of a conventional catalyst carrier case and a guide member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Catalytic converter 2 Catalyst carrier case 3 Catalyst carrier main body 4 Inner peripheral surface 5 Inlet side taper surface 6 Back side taper surface

Claims (6)

In the catalytic converter (1) in which the catalyst carrier body (3) is press-fitted into the cylindrical catalyst carrier case (2),
A plurality of continuous tapers that expand toward the opening end surface and have different taper angles (α1) and (α2) on the inner peripheral surface (4) of at least one opening end of the catalyst carrier case (2). Catalytic converter (1) characterized in that surfaces (5) and (6) are provided. A catalytic converter (1) according to claim 1, comprising:
Of the continuous tapered surfaces (5) and (6), the taper angle (α1) of the taper surface (5) located on the opening end face side is the taper angle (6) of the taper surface (6) located on the back side in the cylinder ( Catalytic converter (1) characterized in that it is set smaller than α2). Catalytic converter (1) according to claim 2,
The taper surfaces (5) and (6) are two, and the taper angle (α1) of the taper surface (5) located on the opening end surface side is set within 30 degrees, and the taper surface (5) is located on the inner side in the cylinder. The catalytic converter (1), wherein the taper angle (α2) of the taper surface (6) is set within 45 degrees. The catalytic converter according to claim 1,
Of the continuous tapered surfaces (5) and (6), the taper angle (α1) of the taper surface (5) located on the opening end face side is the taper angle (6) of the taper surface (6) located on the back side in the cylinder ( A catalytic converter (1) characterized in that it is set larger than α2). The catalytic converter according to claim 4, wherein
The taper surfaces (5) and (6) are two, and the taper angle (α2) of the taper surface (6) located on the inner side in the cylinder is set within 30 degrees, and the taper surface (6) is located on the opening end surface side. The catalytic converter characterized in that the taper angle (α1) of the taper surface (5) is set within 45 degrees. A catalytic converter (1) according to any one of claims 1 to 5, comprising:
The catalytic converter (1), wherein the tapered surfaces (5) and (6) are provided on both ends of the catalyst carrier case (2).

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