JPH08103662A - Ceramic catalytic converter - Google Patents

Abstract

PURPOSE: To satisfactorily hold a ceramic honeycomb carrier even at a high temp. over a long time. CONSTITUTION: This ceramic catalytic converter disposed in the exhaust passage of an engine consists of a ceramic honeycomb carrier 2, a jacket 4 housing the carrier 2 and a holding member 5 made of a combination of metals different from each other in the coefft. of linear expansion and interposed between the carrier 2 and the jacket 4. At the time of temp. rise by exhaust gas, the holding member 5 absorbs the clearance between the carrier 2 and the jacket 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic honeycomb carrier holding structure used in a catalytic converter for automobiles.

[0002]

2. Description of the Related Art Conventionally, as a material for a ceramic honeycomb carrier used in a catalytic converter for automobiles, cordierite ceramic (2MgO.2Al2O3.5SiO) having a low coefficient of thermal expansion has been used.
2) is used and has a market record of more than 10 years. Generally, since this ceramic honeycomb carrier has low toughness and is brittle, it is wrapped in a wire net which is a cushioning material as shown in JP-A-58-84038, and housed in a metal outer cylinder for use.

Noble metals such as Pt, Rh and Pd for converting harmful components such as CO, HC and NOx contained in the exhaust gas of an automobile engine into harmless gas or water are formed on the surface of the ceramic honeycomb carrier. Carried.
However, these noble metals are 300 ° C to 350 ° C
If the catalyst is not heated to the catalyst activation temperature, its ability will not be exhibited. Therefore, the catalyst temperature immediately after engine start is 300 ° C.
Until it is heated to 350 ° C. or higher, unpurified exhaust gas is discharged. As a countermeasure against this, it is required to dispose the catalytic converter near the engine.
Since it is only from ℃ to 850 ℃, it cannot be used at a temperature exceeding the oxidation resistance of this wire net. Therefore, it was virtually impossible to dispose the catalyst just below the exhaust manifold of the engine such that the maximum exhaust gas temperature exceeds 950 ° C.

Therefore, a method has been proposed in which a ceramic honeycomb carrier as shown in JP-A-2-43955 is wrapped and held by a heat-resistant ceramic mat. However, although this example is excellent in improving the heat resistance of the holding material itself, it is actually 950 ° C.
In a usage environment exceeding 1, the difference between the coefficient of linear expansion of a ceramic honeycomb carrier (1.2 × 10 ^-6 / ° C) and the coefficient of linear expansion of a metal outer cylinder (1.1 × 10 ^-5 / ° C for SUS430) As a result, a clearance is generated between the two and the holding force is reduced, so that sufficient durability cannot be obtained. For example, taking a ceramic honeycomb carrier of φ80 as an example,
The clearance due to the above-mentioned difference in thermal expansion actually exceeds 1 mm.

On the other hand, as disclosed in Japanese Utility Model Publication No. 4-26649, this problem is solved by using a ceramic mat as a thermal expansion material in which a ceramic short fiber and a thermal expansion material such as vermiculite or mica are mixed. There are also some that have been put to practical use. However, with the current thermal expansion materials, when exposed to exhaust gas exceeding 900 ° C., the thermal expansion materials such as vermiculite and mica undergo severe deterioration, so sufficient reliability cannot be guaranteed. .

That is, a catalytic converter using a ceramic honeycomb carrier that can be used for a long time at a high temperature of over 950 ° C. has not yet been provided. Therefore, it is an object of the present invention to provide a ceramic catalytic converter capable of sufficiently holding a ceramic honeycomb carrier even under high temperature for a long time.

[0007]

Therefore, in the present invention, there is provided a ceramic honeycomb carrier which is disposed in an exhaust path of an engine and carries a catalyst for purifying harmful components of the exhaust gas of the engine, and the ceramic honeycomb carrier. And a ceramic honeycomb carrier and the outer cylinder that are housed therein and are combined with metals having different linear expansion coefficients, and the temperature of the exhaust gas is raised by the exhaust gas. A ceramic catalytic converter comprising a carrier and a holding member that absorbs a clearance between the carrier and the outer cylinder.

Particularly preferably, two or more kinds of metals having different linear expansion coefficients, such as band-like or annular, such as SUS31.
0 (1.7 × 10 ⁻⁵ / ° C.) and SUS430 (1.1 × 1)
(0 ⁻⁵ / ° C.) a holding member joined to a metal plate, and an outer cylinder or a belt-shaped or annular deformation regulating member in the circumferential direction and / or the radial direction and / or the axial direction of the ceramic honeycomb carrier, It may be arranged between the ceramic honeycomb carrier and the ceramic honeycomb carrier.

The present invention is not limited to the above configuration,
For example, SUS430 (1.1 x 10 ^-Five/ ° C), etc.
On the other hand, a metal having a large linear expansion coefficient, for example, SUS310
(1.7 × 10^-Five/ ° C), etc.
Or holding by a ring-shaped or cylindrical metal plate
The members are arranged in the circumferential direction of the ceramic honeycomb carrier and / or
Or radially and / or axially,
Band-shaped or circular deformation restriction member and ceramic
Proposal for a structure that is arranged between the NICAM carrier
I do.

[0010]

According to the above construction, the holding member disposed between the outer cylinder or the deformation regulating member and the ceramic honeycomb carrier is made of the ceramic honeycomb carrier as the temperature of the ceramic honeycomb carrier increases due to the heat of the exhaust gas. It deforms so as to absorb the clearance between the carrier and the outer cylinder. The amount of deformation can be obtained in proportion to the increase / decrease in the clearance between the ceramic honeycomb carrier and the outer cylinder (proportional to the temperature change). Therefore, the ceramic honeycomb carrier is not pressed more than necessary and is not damaged.

That is, an appropriate holding force can be obtained under all temperature conditions, and for example, the catalytic converter of the present invention arranged in the exhaust gas passage has a honeycomb carrier and an outer cylinder even at a high temperature of 950 ° C. or higher. There is no clearance between them. Further, when the holding member has a bimetal structure in which two kinds of metals having different linear expansion coefficients are joined to each other, the amount of deformation can be extremely large, and therefore, for example, sufficient holding force can be easily obtained even at a high temperature of 950 ° C. or higher. To be

Further, since the deformation regulating member for regulating the deformation of the holding member when the temperature returns to the normal temperature state is provided, it does not excessively return and the holding force can be maintained in the exhaust gas temperature up / down cycle without any problem. Acts to obtain

[0013]

By adopting the present invention, it becomes possible to reliably hold the ceramic honeycomb carrier under any temperature environment. In addition, since there is little deterioration of the holding force due to heat deterioration that is observed in a general inorganic elastic body as a holding member, it can be used under high temperature conditions of, for example, 950 ° C. or higher, and the holding performance can be maintained for a long time. . As a result, it is possible to provide a catalytic converter that is cheaper than a metal catalytic converter and that is significantly superior to conventional ceramic catalytic converters in terms of vibration resistance and heat resistance load resistance.

Further, as compared with the conventional ceramic catalytic converter, since it becomes possible to mount it on the upstream side of the engine, when it is mounted on the upstream side of the engine, the temperature rising property immediately after starting is enhanced, and the current situation is increased. It becomes possible to purify unpurified toxic exhaust gas immediately after the engine is started.

[0015]

【Example】

(First Embodiment) A first embodiment of the present invention will be described with reference to FIGS.
Will be explained. FIG. 1 is a schematic diagram of a ceramic catalytic converter 1 showing a first embodiment of the present invention. FIG.
FIG. 3 is a diagram showing a partial cross section of a case where the ceramic catalytic converter 1 of the first embodiment of the present invention is mounted on the exhaust manifolds 26a, 26b of the exhaust path of the engine 25 which is an internal combustion engine. FIG. 4 is a diagram showing a structure for holding the ceramic catalytic converter 1 of the first embodiment midway in the exhaust pipe. The ceramic catalytic converter 1 of the first embodiment includes a ceramic honeycomb carrier 2, a heat-resistant stainless steel corrugated plate 3 that covers the outer peripheral side surface of the ceramic honeycomb carrier 2, a ceramic honeycomb carrier 2 and a corrugated plate 3.
And an outer cylinder 4 fixed to the outer cylinder 4, which is generated at a high temperature, the corrugated plate 3, and the ceramic honeycomb carrier 2
A holding member 5 that absorbs the clearance between the holding member 5 and a deformation restricting member 6 that restricts the deformation of the holding member 5 at low temperatures; Flange 7 fixed in the exhaust path
It consists of. Ceramic honeycomb carrier 2
Has a diameter of 71 mm, a length of 60 mm, and a wall thickness of 0.08 to 0.
It is a 13 mm thin wall ceramic monolith, and its material is cordierite ceramic (2MgO.
2Al2O3 · 5SiO2) is used.

The corrugated plate 3 contains 18 to 24 wt% of Cr and Al.
Is 4.5 to 5.5 wt% and the rare earth element (REM) is 0.
It is a band-shaped heat-resistant stainless steel foil having a width of 70 mm and a plate thickness of 0.03 to 0.20 mm, which is composed of 1 to 0.2 wt% and the balance of Fe-Cr-Al composition. The outer cylinder 4 is made of ferritic heat-resistant stainless steel SUS430 and has an inner diameter of 77 m.
m, width 70 mm, plate thickness 1.5 mm, a cylinder having four substantially square through holes by press working into the shape shown in FIG. It is manufactured into a cylindrical shape by bending, and is manufactured by joining the sides 4a at both ends.

As shown in FIG. 6B, the holding member 5 is formed by joining an inner holding member 11 having a small expansion coefficient and an outer holding member 12 having a large linear expansion coefficient, and the outer peripheral side surface of the honeycomb carrier 2 made of ceramic. The holding member 11 is attached to the side. The inner holding member 11 has a radius of 37 mm,
It is a ferritic heat-resistant stainless steel SUS430 having a central angle of 120 °, a width of 20 mm, and a plate thickness of 1.5 mm. The outer holding member 12 has a radius of 38.5 mm, a central angle of 120 °, and a width of 2
Austenitic heat resistant stainless steel SUS310 having a thickness of 0 mm and a thickness of 1.5 mm. Further, as shown in FIG. 6A, the inner holding member 11 and the outer holding member 12 of the holding member 5 are joined by continuously running the laser beam in the circumferential direction during assembly. Are welded together. Furthermore, in the example of FIG.
The columns are joined in parallel. This joining area is not limited to the example of FIG. 6, but as shown in FIG. 7A, a group of circles arranged in the circumferential direction of the holding member, or as shown in FIG. 7B, the entire contact surface of the holding member, or (c). ), The circumference of the end of each side of the holding member may make one round, or as shown in (d), the entire outer circumference of the contact portion of the holding member.

FIG. 6, FIG. 7 (a), FIG. 7 (b), FIG.
As in the example (c), it is desirable that the holding members be joined such that there is always a welded portion in any cross section taken in the direction perpendicular to the circumferential direction. This is because, as will be described later, the holding member is configured to hold the ceramic honeycomb carrier by deforming it as a bimetal in the circumferential direction. This is because the amount of deformation can be obtained.

The deformation regulating member 6 is made of ferritic heat-resistant stainless steel SUS430 and has an inner diameter of 80 mm and a width of 54 m.
m, the plate thickness is 1.5 mm, the flange 7 is made of ferritic heat-resistant stainless steel SUS430, and has an inner diameter of 83
mm, outer diameter 98 mm, and plate thickness 3 mm. Next, a method of assembling each component of the ceramic catalytic converter 1 described above will be described with reference to FIG.

First, as shown in FIG. 8, the corrugated plate 3 is wound around the ceramic honeycomb carrier 2 twice. The wave height of the corrugated plate 3 is processed to be about 0.1 to 0.4 mm higher than 1/2 of the difference between the outer diameter of the ceramic honeycomb carrier and the inner diameter of the outer cylinder, and the wave pitch is approximately 2 The one with 0.5 mm is used. Next, as shown in FIG. 9, of the four side surfaces of the substantially quadrangular through hole formed in the outer cylinder 4, one of the two side surfaces having the shorter side length has a holding member. One end 5a of 5 is welded and joined. By repeating this operation four times, the four holding members are joined to the outer cylinder. At this time, a plurality of holding members are provided so as to be located radially on the same circumference of the outer cylinder as viewed from the center of the ceramic honeycomb carrier, and are mounted at a plurality of positions while being displaced in the honeycomb axial direction. Is desirable. This is because the holding member is deformed and the holding force can be uniformly applied to the ceramic honeycomb carrier.

The ceramic honeycomb carrier 2 having the corrugated plate 3 wound twice is press-fitted into the outer cylinder 4. The press-fitting depth is such that the position of the ceramic honeycomb carrier 2 is the corrugated plate 3 and the outer cylinder 4.
Up to the position near the center, and then the outer cylinder and the corrugated plate are laser beam bonded at the rear end. At this time, since the two corrugated plates 3 are formed in a stacked state, the difference in heat capacity between the corrugated plates 3 and the outer cylinder 4 at the time of laser beam bonding can be absorbed, and welding cracks of the foil material can be prevented.

Further, in laser beam welding, when a laser beam is continuously run on the outer peripheral side surface of the outer cylinder, a thermal deformation of the outer cylinder during welding causes a clearance between the outer cylinder and the corrugated sheet during welding. It may occur and welding failure may occur. However, by discontinuously running the laser beam and providing the non-bonded portion, the heat of the laser beam is released, and even when the outer cylinder is thermally deformed, the deformation amount can be absorbed by the non-bonded portion. . In the first embodiment, the outer cylinder is rotated, and while the outer cylinder is rotated by 90 °, the laser beam irradiation is stopped by rotating by 15 °, and the non-joint portion is provided. That is, there are four joints and non-joints on one circumference of the outer cylinder. In the first embodiment, further, by this method, a total of two rounds of welding are performed in the circumferential direction by shifting the position by 2 mm in the axial direction.
Two lines 8 extending in the circumferential direction of the outer cylinder shown in FIG. 9 indicate laser beam marks. In the first embodiment, the laser beam joining is shown as the joining method, but it goes without saying that brazing joining may be performed. In this state, the flange 7 is welded to the front end of the outer cylinder, and the deformation regulating member 6 made of the same material (made of ferritic heat-resistant stainless steel SUS430) as the outer cylinder processed to have an inner diameter substantially the same as the outer diameter of the outer cylinder.
Is assembled and welded to the outer cylinder 4. In this case, needless to say, if at least one side of the flange surface is joined all around, exhaust gas leakage between the flange and the outer cylinder can be prevented.

The outer cylinder 4, the flange 7 and the deformation regulating member 6 are all made of ferritic heat resistant stainless steel SUS4.
It is made of 30 and selected with the same material so as to improve weldability. In the first embodiment, an example in which the deformation restricting member 6 is provided around the outer cylinder 4 has been shown. If the diameter can be made substantially the same as the diameter, an exhaust pipe may be used instead.

Further, the outer cylinder 4, the flange 7 and the deformation regulating member 6 are welded by a γ-Al 2 O 3 coat, which will be described later, in which an oxide film is formed on the welded surface and a catalyst supporting step in order to secure high weldability. It is desirable that it be done before. In the above embodiment, the outer cylinder 4 and the holding member 5 are individually manufactured and joined, but as shown in FIG. 10, the outer cylinder 4 and the inner holding member 11 are integrally pressed and then the side 4
You may join the b part and join the outer side holding member 12.

With the above, all the assembling steps have been completed, and finally the catalytic noble metal is supported. The catalyst supporting method will be described in detail below. First, the ceramic honeycomb carrier 2 is impregnated with a slurry containing .gamma.-Al2 O3 and pre-baked. And Pt or R which is a catalytic metal
It is impregnated with an aqueous solution in which h and the like are dissolved, and is fired again. Through the above steps, the ceramic honeycomb carrier can be used as a catalytic converter that can be attached to the exhaust path of an automobile. As shown in FIG. 2 to FIG. 4, the ceramic catalytic converter 1 includes a gasket 12 between the exhaust manifold mounting flange 14a and the start catalyst mounting flange 14b, and a flange 12 not shown in FIG. It will be connected and fixed by 16.

In this embodiment, the engine is V8,400.
It is 0 cc, and the eight exhaust manifolds derived from this engine are assembled into four exhaust manifolds to form two exhaust manifolds. Then, in the middle of each exhaust manifold, a ceramic catalyst converter 1 and a start catalyst 7 which is a monolith catalyst made of ceramic having a capacity of 1300 cc are arranged downstream thereof. The start catalyst 7 which is the monolith catalyst carrier is an outer cylinder 2 for the start catalyst.
Wire net or ceramic fiber mat in 0
It is held and fixed via 8.

The outer cylinder 17 for the start catalyst
The downstream side flange 19 and the exhaust pipe flange 20 are connected to each other by bolts 21 and are integrated, and the exhaust pipe 22 is assembled on the downstream side into one, and the main catalyst of not shown is 1000 cc each. Connected to the list. Next, the operation of the first embodiment will be described.

When the engine is started with the above-mentioned structure, the ceramic catalytic converter 1 is 400 ° C. to 500 ° C. after about 10 to 15 seconds (the engine is in an idling state).
The exhaust gas emitted from the engine is purified by raising the temperature and activating the catalytic substance. The ceramic catalytic converter 1 of the first embodiment, as shown in FIG. 2 and FIG.
Since it is arranged directly below the exhaust manifold of the engine, it can receive a large amount of thermal energy of exhaust gas as compared with the conventional catalytic converter arranged under the floor. Furthermore, in the first embodiment, since the thin wall ceramic monolith having a wall thickness of 0.08 to 0.13 mm is adopted for the honeycomb carrier, the conventional wall thickness of 0.15 to 0.25 mm is used.
The heat capacity is smaller than that of For the above reason, even immediately after the engine with low exhaust gas temperature is started,
The temperature rises in a short time, and the catalytic substance becomes activated.

Further, the ceramic honeycomb carrier has an extremely small thermal conductivity as compared with the metal honeycomb carrier. For example, in the cordierite-based ceramic (2MgO / 2Al2O3.5SiO2) used in the first embodiment,
It is about 1/10 or less. Therefore, after the temperature rise is started, the heat transfer of the heat energy of the exhaust gas causes the catalyst substance on the forefront part of the ceramic honeycomb carrier to locally rise in temperature. After that, using exhaust gas heat and heat of catalytic reaction as heat sources,
The activation region gradually expands in the downstream direction of the exhaust gas flow. At this time, since the thermal energy of the catalytic reaction heat is extremely large, as a result, the entire area is activated in a short time, and although the heat capacity is larger than that of the metal honeycomb carrier, the same purifying performance can be obtained.

On the other hand, as the temperature of the ceramic honeycomb carrier increases due to the heat of exhaust gas, the holding member 5 disposed between the outer cylinder 4 and the ceramic honeycomb carrier 2 includes the ceramic honeycomb carrier and the outer cylinder. As shown in FIG. 11, the ceramic honeycomb carrier is deformed so as to absorb the clearance. The amount of deformation can be obtained in proportion to the increase / decrease in the clearance between the ceramic honeycomb carrier and the outer cylinder (proportional to the temperature change). Therefore, the ceramic honeycomb carrier does not be pressed more than necessary, does not cause damage, and acts to give a certain holding force.

Further, since the holding member has a bimetal structure in which two kinds of metals having different linear expansion coefficients are joined to each other, the deformation amount thereof is extremely large, and a sufficient holding force can be easily obtained even at a high temperature of 950 ° C. or higher. It is composed. That is, the catalytic converter of the present invention, which has an adequate holding power under all temperature conditions and is arranged in the exhaust gas passage,
No clearance is generated between the ceramic honeycomb carrier and the outer cylinder even at a high temperature of 50 ° C. or higher. Further, since the deformation regulating member 6 for regulating the deformation of the holding member is provided when returning to the normal temperature state, the holding force can be obtained without a problem even in the up-down cycle of the exhaust gas temperature without excessively returning. Acts to be acted upon. Further, the ceramic catalytic converter of the present invention shown in FIG. 5 is shown as an example in which the ceramic catalytic converter is mounted very close to the exhaust manifold so that the temperature of the exhaust gas can be raised early so that such a place can be used while the vehicle is running. It is also in a very severe environment where it is exposed to high temperature exhaust gas and engine vibration.

However, since the ceramic honeycomb carrier 2 receives the force due to the deformation of the holding member 5 via the corrugated plate 3, that is, the holding force is applied to the wide contact surface, the stress is locally concentrated. The ceramic honeycomb carrier can be reliably and uniformly held without causing (The member for stress distribution provided between the ceramic honeycomb carrier and the holding member is referred to as a cushion material below.) Due to the above effect of the corrugated plate, it has a very high holding structure against heat load and engine vibration, and has durability. Will not cause any problems.

This metal ceramic honeycomb carrier is
As shown in FIGS. 1 and 11, the holding member 5 and the ceramic honeycomb carrier 2 are provided by the cushion member formed of the corrugated sheet material 3.
Although the stress between them is relaxed, the stress between the holding member 5 and the ceramic honeycomb carrier 2 may be relaxed by a cushion member composed of the heat-resistant ceramic fiber mat 9 as shown in FIG. The durability against heat loads and engine vibrations is likewise very high in this case as well, without causing any problems.

(Second Embodiment) A second embodiment of the present invention is shown in FIG.
It will be described with reference to FIGS. FIG. 13 is a development view showing an assembled state of parts constituting the ceramic catalytic converter 200 according to the second embodiment of the present invention, and FIG. 14 is a side view of the ceramic catalytic converter 200 according to the second embodiment. .

The ceramic catalytic converter 200 is formed of cordierite ceramic honeycomb carrier 201 having a diameter of 71 mm and a length of 60 mm, which has 400 passages per inch in the exhaust gas flow direction, and an austenitic heat-resistant stainless steel SUS310 plate. Two types of holding members 202, 203 and ferritic heat resistant stainless steel S
The outer cylinder 204 is made of US430 and has a cylindrical shape with an inner diameter of 77 mm, a width of 70 mm, and a plate thickness of 1.5 mm.

The ceramic honeycomb carrier 201 is disposed inside the outer cylinder 204, and a press-fitting margin of 0.2 to 0.8 mm is provided in a space between the ceramic honeycomb carrier 201 and the outer cylinder 204. The two holding members 202 and 203 processed so that it is press-fitted. These holding members 202 and 203 are formed of the heat-resistant stainless steel plate having a width of 70 mm and a thickness of 1.2 mm, which is processed to have substantially the same dimension as the axial length of the outer cylinder 204. Further, the holding member 20
The second and second holding members 20 and 20 are arranged so that the first holding member 202 is arranged along the side surface of the outer cylinder 204.
3 is arranged along the outer peripheral side surface of the ceramic honeycomb carrier 201. Further, the first and second holding members are
The first and second holding members are arranged so as to partially overlap each other, and the tips of the overlapping portions have a wedge shape.

Next, the operation and effect of the second embodiment will be described. At room temperature, the ceramic honeycomb carrier 201 is
The outer cylinder 204 holds the first holding member 202 and the second holding member 203. When the exhaust gas temperature rises to a high temperature, the outer cylinder 204 has a linear expansion coefficient about 10 times that of the ceramic honeycomb carrier 201, so the outer diameter 204 expands more than the ceramic honeycomb carrier 201, and both A gap is formed between them.
However, since the holding members 202 and 203 operate to absorb this difference in expansion, no gap is created in the ceramic catalytic converter 200 of the present invention. This is because the first holding member 202 is in contact with the inner peripheral surface of the outer cylinder 204 and the second holding member 203 is in contact with the outer peripheral surface of the ceramic honeycomb carrier 201, and one ends of the two overlap with each other. And two holding members 202 and 203
This is because the wedge effect causes the outer cylinder 204 and the ceramic honeycomb carrier 201 to operate as fulcrums. The two holding members 202 and 203 are deformed so as to push each other apart, and the ceramic honeycomb carrier 201 can be reliably held even at high temperatures. The holding member 202 presses the outer cylinder 204 and also holds the holding member 2
03 is pressed against the ceramic honeycomb carrier 201, so that the ceramic honeycomb carrier 201 becomes the outer cylinder 2
There is no way out of 04. Outer cylinder 2 depending on the temperature
Since the gap between 04 and the ceramic honeycomb carrier 201 changes proportionally, it can always be automatically adjusted. In this case, if at least a part of at least one of the holding members 202 and 203 is connected and fixed to the outer cylinder, a positional displacement due to thermal expansion and thermal contraction does not occur,
It is possible to obtain higher durability. Further, it is needless to say that a larger holding force is generated for the holding members 202 and 203 because a material having a larger linear expansion coefficient with respect to the outer cylinder is selected. In this embodiment, the holding members 202 and 203 are provided directly on the outer peripheral side surface of the ceramic honeycomb carrier. However, the holding members 202 and 203 are not limited to this. For example, a plate made of heat-resistant stainless steel having a Fe—Cr—Al composition. A strip-shaped flat plate having a thickness of 0.03 to 0.20 mm, a corrugated plate having a wave pitch of 2.5 mm and a wave height of about 2 mm processed from the same material, or a heat-resistant ceramic mat is provided on the outer peripheral side surface of the ceramic honeycomb carrier. It may be configured to be provided after winding. This is provided in order to disperse the stress generated when the holding members 202 and 203 hold the outer peripheral side surface of the ceramic honeycomb carrier. If this configuration is adopted, cracking of the ceramic honeycomb carrier is prevented. The durability can be further improved.

(Third Embodiment) A third embodiment of the present invention is shown in FIG.
This will be described with reference to FIGS. FIG. 15 is a front sectional view of a ceramic catalytic converter 310 according to a third embodiment of the present invention, and FIG. 16 is a side view of the same. Figure 17
It is a schematic diagram of the holding member 340 which is a component.

FIG. 18 is a side view showing a case where the ceramic catalytic converter 310 of the third embodiment of the present invention is arranged in high temperature exhaust gas. In the ceramic catalytic converter 310 of the third embodiment of the present invention, a cordierite honeycomb carrier 320 having a diameter of 71 mm and a length of 60 mm, which has 400 passages per inch in the exhaust gas flow direction, has a cylindrical heat resistance. It is press-fitted and fixed to an outer cylinder 330 made of stainless steel via a cushion member 350. This cushion member 350 is made of Fe-Cr-A.
made of heat-resistant stainless steel with a composition of 1 and a plate thickness of 0.0
3 to 0.20 mm, wave pitch 2.5 mm, wave height 2 mm
have.

The outer diameter of the ceramic honeycomb carrier 320 is smaller than the inner diameter of the outer cylinder 330, and the cushion member 350 is fixed with a press-fitting margin of 0.2 to 0.8 mm that does not damage the ceramic honeycomb carrier. ing. The holding member 340 is made of stainless steel 34 having a large coefficient of thermal expansion.
1 (SUS304 or SUS310) and small stainless steel 342 (SUS430 or SUS410 or Fe-20Cr-5Al).

The holding member 340 is made of a metal 342 having a small coefficient of thermal expansion and a metal 341 having a large coefficient of thermal expansion, which are superposed on each other and then mechanically joined by welding, brazing or the like.
After joining one ends in the longitudinal direction, a metal plate 342 having a small thermal expansion coefficient is processed into a spiral shape capable of covering one or more rounds along the outer peripheral side surface of the ceramic honeycomb carrier. Further, the holding member 340 is constructed by assembling around the ceramic honeycomb carrier, and then joining at least one spiral-shaped end located on the opposite side to one end in the longitudinal direction where it is first joined, and the central portion of both. (Fig. 17). At this time, first, two types of metals 341 and 342 having different thermal expansion coefficients may be processed into a spiral shape, and then the above positions may be joined so that the metal plate 342 having a small thermal expansion coefficient is located inside.

The ceramic honeycomb carrier 320 has its outer peripheral surface covered with a corrugated plate 350, which is a cushion member, two times.
After being inserted into at least one or more holding members 340 processed into the above-described spiral shape, and further inserted into the outer cylinder 330, the holding member 340 and a part of the outer cylinder 330 are welded and joined, and the ceramic catalytic converter 310. Are formed. At this time, after joining the holding member 340 and the outer cylinder 330, the ceramic honeycomb carrier 320 and the cushion member 350 may be press-fitted.

Next, the operation of the second embodiment will be described. The ceramic catalytic converter of this embodiment is attached to the exhaust path and functions as a catalyst. When driving a vehicle under high load,
Ceramic catalytic converters are exposed to high temperatures. This time,
The ceramic catalytic converter has a stainless steel outer cylinder with a large thermal expansion coefficient and a thermal expansion coefficient of about 1/10 of that of the outer cylinder.
Since it is composed of a cordierite honeycomb carrier,
A radial clearance is generated between the outer cylinder and the ceramic honeycomb carrier. However, in the ceramic catalytic converter 310 of the present embodiment, the holding member for holding the ceramic honeycomb carrier in the outer cylinder operates so as to absorb the clearance.

Since this holding member is made of two kinds of metals having different linear expansion coefficients, at the time of high temperature, the holding member is deformed so as to reduce the inner diameter of the spiral due to the difference in thermal expansion coefficient, and the above clearance is produced. Can be absorbed.
That is, the holding member deforms so as to tighten the outer peripheral side surface of the ceramic honeycomb carrier as the temperature rises.
On the other hand, since a part of the holding member is mechanically joined to the outer cylinder, the outer cylinder can hold the ceramic honeycomb carrier through the holding member. FIG. 18 shows this state.

By the above operation, the ceramic catalytic converter 310 of this embodiment can give a holding force to the ceramic honeycomb carrier even at a high temperature. Also, when the ceramic catalytic converter is left at high temperature for a long time, that is, when the holding member is left for a long time with its diameter reduced, when the holding member creeps, the temperature decreases and the temperature returns to room temperature. , The holding member may spread beyond the original diameter. However, since the deformation of the holding member is limited by the outer cylinder, it does not become larger than the inner diameter of the outer cylinder. When the temperature rises again, the honeycomb carrier is deformed so as to have a holding force sufficient to hold the honeycomb carrier. In this case, it goes without saying that the gap between the outer cylinder and the honeycomb carrier needs to be set to be equal to or less than the deformation amount of the holding member at the maximum operating temperature of the ceramic catalytic converter. Further, the holding member of the ceramic catalytic converter of the present invention can have a large holding area by increasing the number of spiral turns. This means that by adjusting the number of spirals of the holding member, the holding force of the honeycomb carrier generated at high temperature can be set to an appropriate value, and the honeycomb carrier can be reliably held.

Further, the holding member of the ceramic catalytic converter of the present invention can be adjusted to an arbitrary outer diameter as described above, so that it can be easily attached to the honeycomb carrier or the outer cylinder. is there. This is because when the holding member is inserted into the honeycomb carrier, the diameter can be easily reduced by twisting in a direction opposite to the spiral winding direction and applying a twisting force in the spiral winding direction. Furthermore, because of the above characteristics, it is possible to have a large dimensional tolerance when processing the spiral shape of the holding member. The cushion member 350 is provided to disperse the stress generated when the holding member 340 is reduced in diameter and holds the outer peripheral side surface of the ceramic honeycomb carrier, and is made of a heat-resistant material such as ceramic fiber mat. Fibers may be used.

(Fourth Embodiment) A fourth embodiment of the present invention is shown in FIG.
This will be described with reference to FIGS. FIG. 19 is a schematic diagram of a ceramic catalytic converter 400 according to a fourth embodiment of the present invention. The ceramic honeycomb carrier 401 is inserted in a cylindrical outer cylinder 402, and both opening end surfaces of the outer cylinder 402 are
The outer cylinder 40 is radially arranged so that the plurality of holding members 403 are evenly spaced in the circumferential direction when viewed from the center of the ceramic honeycomb carrier.
It is bonded and fixed to 2.

The ceramic honeycomb carrier 401 has a diameter of 66 mm, a total length of 60 mm, a cell size of 400 cpi, and a cell wall thickness of 0.1 to 0.2 mm, and is made of cordierite.
The outer cylinder 402 is made of a heat-resistant stainless steel plate or steel pipe having a small linear expansion coefficient and a thickness of 1.5 to 2 mm. In this embodiment, the product is made of SUS430, but it is not limited to this. FIG. 20 shows the ceramic catalytic converter 4 of FIG.
00 is a sectional view in the axial direction of 00. The end face of the ceramic honeycomb carrier 401 and the holding member 403 are in contact with each other at least partially, and no gap is formed between them.

Further, between the honeycomb carrier 401 and the outer cylinder 402, a corrugated plate cushion member 408 made of heat-resistant stainless steel foil of Fe—Cr—Al composition is press-fitted. The press-fitting margin is 0.1 to 0.4 mm. Although FIG. 20 shows an example in which the holding member 403 is provided at both the upstream and downstream opening ends, it is necessary to provide the holding member 403 on at least one of the upstream side and the downstream side. The holding member 403 is formed by stacking and joining two types of metal plates having different linear expansion coefficients, and a material 404 having a small linear expansion coefficient is provided on the end face side of the ceramic honeycomb carrier and a linear expansion coefficient is provided on the other side. Of large metal 405 is located. In this embodiment, SUS4 is used as the material 404 having a small linear expansion coefficient.
30 is SUS3 as a metal 405 having a large linear expansion coefficient.
Although 10 is used and the plate thickness is set to 1.0 to 1.5 mm, the material and the plate thickness used are not limited at all. These conditions are
Any combination may be used as long as it has the effects described below.

The holding member 403 can have the shape shown in FIG. 21 in addition to the shape shown in FIG. In FIG. 21, the holding member 403 is formed by joining a metal 405 having a large linear expansion coefficient to a part of a material 404 having a small linear expansion coefficient provided with a notch 406 so as to be overlapped with each other. Similar to the structure shown in FIG. 19, a material 404 having a small linear expansion coefficient is attached to the outer cylinder 402 on the end face side of the ceramic honeycomb carrier.

FIG. 20 shows an example in which a deformation regulating member 407 for preventing deformation of the holding member 403 is provided further outside the holding member 403. The deformation regulating member 407 is the holding member 403.
It is a substantially annular member having sufficient strength against the stress due to the deformation, and is fixed to the deformed outer cylinder 402 or the holding member 403. In either case, the holding member 403 is kept at room temperature.
Is attached so as not to interfere with the operation of the holding member 403 toward the honeycomb side, but when it is fixed to the holding member 403, it is joined to a range other than the movable portion. It goes without saying that the deformation regulating member 407 can also be applied to the configuration of FIG.

The operation and effect of this embodiment will be described.
The ceramic catalytic converter arranged in the exhaust gas passage is heated to 950 by the heat of the exhaust gas and the heat of catalytic reaction during purification.
Reach high temperature above ℃. At this time, the ceramic honeycomb carrier 401 is made of cordierite having a small linear expansion coefficient (1.2 × 10 ⁻⁶ ), while the outer cylinder 402 is
Is made of heat-resistant stainless steel such as SUS430 and has a very large coefficient of linear expansion (1.1 × 10 ⁻⁵ ), so that a large clearance occurs between the two.

In this embodiment, the holding member 403 is shown in FIG.
As shown in FIG. 3a, two kinds of materials having different linear expansion coefficients are overlapped and joined, and when exposed to high temperature, the material is curved to the side where the material 404 having a small linear expansion coefficient is arranged as shown in FIG. 23b. It transforms into the shape. When the temperature drops, it returns to its original shape and can be used reversibly and repeatedly. Figure 2
4 shows the deformation of the holding member 403 in the embodiment shown in FIG. 19 and FIG. 25 shows the deformation of the holding member 403 in the embodiment shown in FIG. In any case, at high temperature, the holding member 403 bends toward the ceramic honeycomb carrier 401 side to eliminate the clearance caused by the difference in thermal expansion amount between the carrier 401 and the outer cylinder 402, and to securely hold the carrier 401. Act on. The deformation recovers when the temperature drops.

Next, the operation of the deformation restricting member 407 shown in FIG. 20 will be described. When the holding member 403 is deformed at a high temperature and the state in which the carrier 401 is held in the axial direction continues for a long time, creep occurs in the holding member 403, and as a result, when the temperature is lowered, the holding member 403 moves away from the carrier more than the position before the deformation. When the temperature returns to the excess direction and the temperature rises again, a gap is generated between the carrier 401 and the carrier 401, and the holding force may be lost. here,
If the deformation regulating member 407 is installed, the holding member 40
3 can be prevented from returning more than necessary, so the holding member 4
No space is generated between the carrier 03 and the carrier 401, and it becomes possible to always secure a reliable holding force at any temperature.

In this embodiment, an example in which a plurality of holding members are radially arranged and used is shown, but the present invention is not limited to this, and as shown in FIG. 26, two annular members having different linear expansion coefficients are used. You may use the one holding member which joined the flat plate or the corrugated plate. In this embodiment, by using the holding member that utilizes the difference in thermal expansion between different materials, it is possible to reliably hold the ceramic honeycomb carrier under any temperature environment. Since the retention force is less likely to decrease due to heat deterioration that is found in a general inorganic elastic body as a holding member, it can be used under a high temperature condition of 950 ° C. or higher and the holding performance can be maintained for a long time. As a result, it is possible to provide a ceramic catalytic converter that is cheaper than the metal honeycomb converter and is significantly superior in vibration resistance and heat load resistance to the conventional ceramic converter.

(Fifth Embodiment) FIG. 2 shows a fifth embodiment of the present invention.
7 and FIG. 28. FIG. 27 shows the fifth aspect of the present invention.
FIG. 28 is a development view showing an assembled state of each component constituting the ceramic catalytic converter 500 of the embodiment, and FIG. 28 is a sectional view in the axial direction. Ceramic catalytic converter 50
No. 1 is inserted in a cylindrical outer cylinder 502, and a holding member 503 having an outer diameter substantially equal to that of the ceramic catalyst converter 501 is incorporated on at least one end surface of the ceramic catalyst converter 501. Holding member 503
A substantially annular deformation restriction member 504 is provided on the outer side of the outer cylinder 502.
It is joined and fixed to both end surfaces of the ceramics to prevent the ceramic catalytic converter 501 and the holding member 503 from protruding from the outer cylinder 502.

The ceramic catalytic converter 501 has a diameter of 66 mm, a total length of 60 to 80 mm, and a cell size of 400 cp.
i, made of cordierite with a cell wall thickness of 0.1 to 0.2 mm. The manufacturing method and supporting process of the honeycomb are the same as those of the usual ceramic monolith carrier. The outer cylinder 502 has a thickness of 1.
Heat-resistant stainless steel plate with a small linear expansion coefficient of 5 to 2 mm,
Or consist of steel pipe. In this embodiment, the product is made of SUS430, but it is not limited to this.

The end face of the ceramic catalytic converter 501 and the holding member 503 are in contact with each other at least in part,
It is configured so that there is no gap between them. Similarly, the holding member 503 and the deformation restricting member 504 are also configured so as to contact each other at least partly so that no gap is formed between them. The holding member 503 is in an assembled state in which it is compressed to the extent that it is elastically deformed in the axial direction of 0.3 to 1 mm.
Although FIGS. 1 and 2 show an example in which the holding member 503 is provided at both the upstream and downstream opening ends, a configuration in which the holding member 503 is provided only at either the upstream side or the downstream side is also possible. Is. In this embodiment, the holding member 503 is made of a material having a larger linear expansion coefficient than the outer cylinder 502, and has a thickness of 0.05 to.
It is made of a plate material of 1 mm, and has a substantially annular shape having a wavy profile along the circumferential direction. The wave height of this profile is 3-5 mm. Although SUS310 is assumed here, any material that withstands the usage environment of the ceramic catalytic converter and has a larger linear expansion coefficient than the material forming the outer cylinder 502 can be similarly used. The shape is not limited to this, but it is desirable that the size and structure have a small heat capacity and do not hinder the temperature rise of the catalyst. The deformation regulating member 504 is a substantially annular member having sufficient strength against the stress due to the expansion deformation of the ceramic catalytic converter 501, the outer cylinder 502, and the holding member 503 at high temperature.
It is fixed to the outer cylinder 502. The material here is the outer cylinder 5.
Although the same as No. 02, other materials can be used as long as there is no problem with the bonding property, heat resistance, and the like. Deformation regulation member 504
It is desirable that the holding member 503 and the holding member 503 are joined to each other to the extent that displacement can be prevented.

The effects of this embodiment will be described. The ceramic catalytic converter arranged in the exhaust gas passage reaches a high temperature of 950 ° C or higher due to the heat of the exhaust gas and the heat of catalytic reaction during purification. At this time, the ceramic catalytic converter 5
01 is made of cordierite having a small linear expansion coefficient (1.2 × 10 ⁻⁶ ), whereas the outer cylinder 502 is SU.
Since it is made of heat-resistant stainless steel such as S430 and has a very large linear expansion coefficient (1.1 × 10 ⁻⁵ ), a large clearance occurs between the two.

In this embodiment, the holding member 503 is made of a material having a linear expansion coefficient larger than that of the material forming the outer cylinder 502 as described above, and therefore the outer cylinder 5 is exposed to a high temperature.
Greater than 02, the material undergoes thermal expansion deformation in the axial direction. Therefore, since the deformation regulating member 504 is present, it cannot be displaced outward, and this thermal expansion deformation acts to fill the clearance between the carrier 501 and the outer cylinder 502, and prevents the occurrence of axial clearance. When the temperature decreases, each component contracts and returns to the original shape and size, but in the process, no axial void is generated, and the carrier 501 is always held securely.

In the present embodiment, by using the holding member utilizing the difference in thermal expansion between different materials, it is possible to reliably hold the ceramic ceramic catalytic converter under any temperature environment. Since there is little decrease in holding force due to heat deterioration that is found in a general inorganic elastic body as a holding member, it can be used under high temperature conditions exceeding 950 ° C., and holding performance can be maintained for a long time. As a result, it is possible to provide a ceramic catalytic converter that is cheaper than the metal honeycomb converter and is significantly superior in vibration resistance and heat load resistance to the conventional ceramic converter.

(Sixth Embodiment) A sixth embodiment of the present invention is shown in FIG.
This will be described with reference to FIGS. FIG. 29 is a front view of the ceramic catalytic converter 600 of the sixth embodiment of the present invention, and FIGS. 30 (a), (b), and (c) are adopted in the ceramic catalytic converter 600 of the sixth embodiment. FIG. 6 is a schematic diagram of a holding member 603 and schematic diagrams showing a normal temperature state and a high temperature state of the holding member 603.

FIG. 31 shows a ceramic catalytic converter 60.
FIG. 30 is a view showing the same cross section as that of FIG. 29 when 0 is arranged in high-temperature exhaust gas. Ceramic honeycomb carrier 60
1 and a cushion member 607 covering the outer peripheral portion thereof are press-fitted and inserted into a cylindrical outer cylinder 602, and at least one end surface of the ceramic honeycomb carrier 601 is substantially equal to or slightly smaller than the inner diameter of the outer cylinder 602. A holding member 603 having an outer diameter is incorporated. On the outer surface of the holding member 603, a substantially annular deformation restriction member 604, which is joined and fixed to the inner peripheral surface of the outer cylinder 602, is arranged to prevent the ceramic honeycomb carrier 601 from protruding from the outer cylinder 602. are doing. The ceramic honeycomb carrier 601 has a diameter of 66 m.
m, total length 60 to 80 mm, cell size 400 cpi, cell wall thickness 0.1 to 0.2 mm. The outer cylinder 602 is made of a heat-resistant stainless steel plate having a small linear expansion coefficient of 1.5 to 2 mm or a steel pipe, and is made of SUS430 in this embodiment, but is not limited to this.

The end face of the ceramic honeycomb carrier 601 and the holding member 603 are constructed so that no gap is formed between them. Similarly, the holding member 603 and the deformation regulating member 604 are also configured so that no gap is created between them. That is, the holding member 603 is assembled and joined in a state in which it is compressed to an extent of elastically deforming 0.3 to 1.0 mm in the axial direction of the ceramic honeycomb carrier. FIG. 29 shows an example in which the holding member 603 is provided at both the upstream and downstream opening ends, but a configuration in which the holding member 603 is provided only at either the upstream side or the downstream side is also possible. .

The cushion member 607 wound around the outer peripheral side surface of the ceramic honeycomb carrier 600 is, for example, a ceramic fiber mat or Fe-Cr-Al.
A heat-resistant stainless steel foil having a composition and a plate thickness of 0.03
.About.0.20 mm, wave pitch 2.5 mm, wave height 2 mm, corrugated plate, 0.1 to 0.4 mm, outer cylinder 6
It is press-fitted in 02.

Next, the structure of the holding member 603 will be described in detail. The holding member 603 is shown in FIG.
It has an annular shape as shown in (b) and (c). The holding member 603 is a ring-shaped substrate 606 made of a material (SUS310 in this embodiment) having a thickness of 0.5 to 1.5 mm and a large linear expansion coefficient, and a holding member 603 having a thickness of 0.5 to 2 mm is more linear than the substrate 606. Material with a small expansion coefficient (SUS43 in this embodiment)
The annular substrate 605 made of 0) is superposed so as to be located only in the vicinity of the outer periphery of the substrate 606, and is joined at the outer peripheral portions of both. That is, the inner diameter of the substrate 605 having a small linear expansion coefficient is larger than the inner diameter of the substrate 606 having a large linear expansion coefficient, and the two are bonded only near the outermost periphery. Further, it is desirable to make the plate thickness of the substrate 606 having a large linear expansion coefficient small in order to facilitate its operation against the deformation of the holding member described later. These holding members 603
In addition to the above materials, the above materials can be similarly used as long as the materials can withstand the usage environment of the ceramic catalytic converter, are excellent in bonding property, and have a large difference in linear expansion coefficient.

Further, the deformation regulating member 604 is the outer cylinder 602.
It is fixed to. The material may be a member having a ceramic honeycomb carrier 601, an outer cylinder 602, and a holding member 603 having a substantially annular member having sufficient strength against the stress due to the expansion deformation, and here, the outer cylinder 602. Although the same as the above, other materials can be used as long as there is no problem with the bondability and heat resistance.

The effect of this embodiment will be described. The ceramic catalytic converter arranged in the exhaust gas passage reaches a high temperature of 950 ° C or higher due to the heat of the exhaust gas and the heat of catalytic reaction during purification. At this time, the ceramic catalytic converter 6
01 is made of cordierite having a small linear expansion coefficient (1.2 × 10 ⁻⁶ ), whereas the outer cylinder 602 made of heat-resistant stainless steel such as SUS430 and the deformation regulating member 604 have extremely large linear expansion coefficients. Because it is large (1.1 x
10 ^-5 ), a large clearance occurs between the two.

However, as described above, the holding member 603 is formed by joining two kinds of materials having different linear expansion coefficients, and the thermal deformation causes the holding member 603 to absorb the clearance and hold the ceramic honeycomb carrier. To be done. The operation of the holding member 603 for absorbing the clearance will be described in detail below. When exposed to a high temperature, the radial deformation amount of the substrate 606 having a large linear expansion coefficient is relatively larger than that of the substrate 605 having a small linear expansion coefficient. Here, since the substrate 606 is mechanically bonded to the deformation restricting portion 605, the amount of radial deformation of the substrate 606 is restricted, so that the stress due to thermal expansion causes the stress of the ceramic honeycomb carrier to increase. It is opened by the deformation in the direction. That is, the substrate 606 is largely deformed to the ceramic honeycomb carrier side where the substrate 605, which is the lower mechanical rigidity side, is not bonded in the both axial directions of the ceramic honeycomb carrier. As a result, as shown in FIG. 31, the holding member 603 is
Is a ceramic honeycomb carrier 601 and a deformation regulating member 60
It works to fill the clearance with 4.

When the temperature decreases, each component contracts and returns to the original shape and size, but the deformation temperature of the substrate 606 is 3
Since it is about 00 ° C., a substantially constant amount of deformation can be maintained in the axial direction during that time, and no axial clearance occurs.
The temperature further decreases, and in the temperature range from 300 ° C. to room temperature, the ceramic honeycomb carrier is held by the outer cylinder 602 and the cushion member 607 on the outer peripheral side surface. That is, the ceramic honeycomb carrier is reliably held at all temperatures.

In this embodiment, the holding member utilizing the difference in thermal expansion between different materials can be used to reliably hold the ceramic honeycomb carrier made of ceramic under any temperature environment. There is little decrease in holding force due to heat deterioration, which is seen in a general inorganic elastic body as a holding member, and there is no problem that it creeps at high temperature like a metal spring and cannot withstand repeated use. Therefore, it can be used under higher temperature conditions than before, and the holding performance can be maintained for a long time. As a result, it is possible to provide a ceramic catalytic converter that is cheaper than a metal honeycomb converter and is extremely excellent in vibration resistance and heat load resistance as compared with a conventional ceramic converter.

(Seventh Embodiment) A seventh embodiment of the present invention is shown in FIG.
It will be described with reference to FIGS. FIG. 32 is a side view of the seventh embodiment, and the configuration will be described using this figure. Seventh
The example is a ceramic honeycomb carrier 701a, b which has a hollow cylindrical shape and is divided into two by an arbitrary surface including the central axis.
A ceramic honeycomb carrier 702 having a cylindrical shape inserted in the hollow cylindrical portion, holding members 703a and 703b interposed therebetween, and ceramic honeycomb carriers 701a, b and 702 and holding members 703a and 703b. , And cushioning materials 704, 705a, b, 706 made of a heat resistant ceramic mat inserted between the ceramic honeycomb carriers 701a, 701b and the outer cylinder 700. The ceramic honeycomb carriers 701a and 701b have an outer diameter of 71 m.
m, the outer diameter of the ceramic honeycomb carrier 702 is 50 m
m and length are 70mm each, and cell size is 400
It is a cordierite carrier having a size of cpi and a cell wall thickness of 0.1 to 0.2 mm.

The holding member 703a is an inner metal plate 703a.
1 and the outer metal plate 703a2, which are joined together at a joint 707a. Similarly, the holding member 70
3b is composed of an inner metal plate 703b1 and an outer metal plate 703b2, which are joined together at a joint 707b. The plate thickness of each of the holding members 703a and 703b is 1.5 mm.

The ceramic honeycomb carrier 701a,
b, 702, holding members 703 a, b, and outer cylinder 700.
Are firmly fixed through the cushioning materials 704, 705a, b, and 706 as shown in FIG. The holding members 703a and 703b may be joined at the joining surface 708 by laser beam joining or brazing, or may be joined at the end 709 to the outer cylinder 700 by laser beam joining or brazing.

Outside metal plates 703 of the holding members 703a, 703b
a2 and b2 are inner metal plates 703a1 and b1 and the outer cylinder 7
A material having a larger linear expansion coefficient α than that of 00 is used. In this embodiment, the inner metal plates 703a1 and 703b1 and the outer cylinder 7
00 material is SUS430, outer metal plates 703a2, b
The material of No. 2 is SUS310. Room temperature of each material (2
5 ° C) to about 950 ° C, the average value of the linear expansion coefficient α is
It is about the following value.

SUS310: α = 1.7 × 10 ⁻⁵ (1 / ° C.) SUS430: α = 1.1 × 10 ⁻⁵ (1 / ° C.) The operation of this embodiment will be described with reference to FIGS. 33 and 34. To do. FIG. 33 is a side view of the internal combustion engine when the exhaust gas temperature is relatively low at approximately 300 ° C. or lower during low speed and low load operation, and FIG. 35 is during high speed and high load operation. Figure 3 in the state when the exhaust gas temperature is high, about 800 ° C or higher
It is the same side view as FIG.

33 and 34 are diagrams showing only the upper half (subscript a) of FIG. 33, and the operation described below is exactly the same for the lower half (subscript b). At low temperature, as shown in FIG. 33, holding members 803a1 and 803a1
03a2 adheres almost completely. That is, the ceramic honeycomb carriers 701a and 702 are firmly fixed to the outer cylinder 700 by the surface pressure from any direction in the radial direction via the holding member 703a and the cushioning materials 704, 705a, and 706. At high temperature, as shown in FIG. 34, the outer cylinder 700 is deformed in the direction in which the diameter increases due to thermal expansion.

At this time, in the holding member 703a, the linear expansion coefficient of the outer metal plate 703a2 is larger than that of the inner metal plate 703a1 and the outer cylinder 700 as described above, and the inner metal plate 703a1 has a larger linear expansion coefficient. Since the peripheral side is constrained by the outer periphery of the ceramic honeycomb carrier 702, the outer metal plate 703a2 is largely deformed radially outward. The radial deformation amount Δr of the outer metal plate 703a2 is maximized in the vicinity of the center of the joint 707a at both ends, that is, in the direction on the z axis in FIG. 34, as shown in FIG. Then, by determining the radius of curvature of the holding member 703a such that the maximum deformation amount becomes equal to or more than the radial deformation amount Δr0 of the outer cylinder 700, the outer cylinder 700, the ceramic honeycomb carrier 701a, and the ceramic honeycomb carrier 701a are made even at high temperature. Outside metal plate 703a of honeycomb carrier 701a and holding member 703a
2, and the inner metal plate 703a1 of the holding member 703a and the ceramic honeycomb carrier 702 are fixed by an appropriate surface pressure.

By adopting the present embodiment having the above-described structure and operation, it is possible to always follow the changes in the exhaust gas temperature and the catalyst internal temperature between the ceramic honeycomb carrier and the outer cylinder in the proper radial surface pressure. Can be generated and can be securely held and fixed. That is, it is possible to avoid damage to the ceramic honeycomb carrier due to vibration and impact of the ceramic honeycomb carrier due to thermal expansion of the outer cylinder at high temperature, which is a problem of the conventional technology, and to secure high exhaust gas purification capability. Becomes

(Eighth Embodiment) An eighth embodiment of the present invention is shown in FIG.
This will be described with reference to FIGS. FIG. 35 is a front sectional view of a ceramic catalytic converter 800 according to an eighth embodiment of the present invention, and FIG. 36 is a side view of the ceramic catalytic converter 800. FIG. 37 is an enlarged schematic view of the holding member 840 which is a component.

FIG. 38 shows a holding member 840 which is a component.
FIG. 37 is a same side view as FIG. 36 when it is configured with a holding member 860 showing another embodiment. The configuration of a catalytic converter 800 showing an eighth embodiment of the present invention will be described with reference to FIG. A ceramic honeycomb carrier 820 made of cordierite and having a diameter of 71 mm and a length of 60 mm, which has 400 conduction paths per inch in the exhaust gas flow direction, has a columnar shape and is made of a heat-resistant stainless steel plate having a thickness of 1.5 mm. It is press-fitted and fixed to the cylinder 830 via a cushion member 850 of a ceramic honeycomb carrier. This cushion member 850 is
Made of heat-resistant stainless steel with e-Cr-Al composition, plate thickness 0.03 to 0.20 mm, wave pitch 2.5 m
m, and the wave height is 3 mm. The outer diameter of the ceramic honeycomb carrier 820 is smaller than the inner diameter of the outer cylinder 830, and the cushion member 850 has a press-fitting margin of 0.3 to 0.8 mm that does not damage the ceramic honeycomb carrier.

Further, the outer cylinder 830 is provided with a deformation regulating member 831 for regulating the protrusion of the ceramic honeycomb carrier 820 in the exhaust gas flow direction on at least one end face side of the ceramic honeycomb carrier 820. The deformation regulating member 831 is formed of a disc-shaped or band-shaped heat-resistant stainless steel plate radially arranged when viewed from the center of the ceramic honeycomb carrier 820.
Further, inside the ceramic honeycomb carrier 820, the ceramic honeycomb carrier 82 extends in the exhaust gas flow direction.
At least one holding member 840 penetrating the inside of 0 is fixed to the deformation regulating member 831 by mechanical joining such as welding, press fitting, or brazing. Ceramic honeycomb carrier 82
A space having substantially the same shape as the holding member 840 is formed at the insertion site of the holding member 840 described above.

In FIG. 35, the ceramic honeycomb carrier 8 is shown.
The holding member penetrating the inside of 20 is configured to extend in the exhaust gas flow direction, but is not limited to this, and for example,
It may be configured to extend from the inner peripheral surface of the outer cylinder 830 toward the center of the ceramic honeycomb carrier near the center of the exhaust gas flow direction, near the upstream side, or near the downstream side.

Further, in FIG. 35, the holding member 840 is fixed to the deformation restricting member 831 by mechanical joining such as welding, press fitting, brazing or the like, but the present invention is not limited to this, and the outer cylinder 830 is not limited thereto. Alternatively, the structure may be such that it is fixed to both the outer cylinder 830 and the deformation regulating member 831 by mechanical joining such as welding or brazing. As shown in FIG. 37, the holding member 840 is made of stainless steel 841 (SUS304 or SUS310) having a large linear expansion coefficient and stainless steel 842 (SUS430 or SUS) having a small linear expansion coefficient.
410 or Fe-20Cr-5Al). Further, the holding member 840 in the present embodiment has a plate thickness of 1.5 mm and a length of 40 mm, but the material used and the plate thickness are not limited by this. It is sufficient that these conditions are a combination sufficient to obtain the effects described below.

The holding member may be formed by joining strip-shaped flat plates shown in FIG. 37 and then bending one end of the ceramic honeycomb carrier in the center direction as shown in FIG. 38. If the shape such as the shape 860 that increases the adhesiveness with the space provided in the carrier,
Needless to say, it is more preferable. Similarly, the deformation restricting member 831 has only to have sufficient strength against the stress due to the expansion deformation of the ceramic catalytic converter 820, the outer cylinder 830, and the holding member 840 at high temperature, and the material and the plate thickness are Other materials can be used as long as there is no problem in bonding property, heat resistance, and the like.

The operation of this embodiment will be described below. During high load operation of the vehicle, the catalytic converter is exposed to high temperatures. When used at high temperatures, the catalytic converter is composed of an outer cylinder having a large thermal expansion coefficient and a small honeycomb carrier made of cordierite, so that a clearance is generated between the outer cylinder and the ceramic honeycomb carrier. However, in the catalytic converter of the present embodiment, the holding member has different thermal expansion coefficients.
Since it is composed of different types of metals, it deforms into a curved shape due to the difference in coefficient of thermal expansion at high temperatures. At this time, the deformed holding member comes into close contact with the side surface of the space portion provided inside the ceramic honeycomb carrier, and a surface pressure corresponding to the deformation amount of the holding member acts between them, so that the ceramic honeycomb carrier is held. To be done. Further, an arbitrary surface pressure can be obtained by changing the number of holding members provided.

When the temperature is lowered, each component contracts and returns to its original shape and size, but in the process, no radial void is generated and the carrier 800 is always held securely. In the present embodiment, by using the holding member that utilizes the difference in thermal expansion between different materials, the ceramic-made catalytic converter made of ceramic can be reliably held under any temperature environment. Since there is little decrease in holding force due to heat deterioration that is found in a general inorganic elastic body as a holding member, it can be used under high temperature conditions exceeding 950 ° C., and holding performance can be maintained for a long time. As a result, it is possible to provide a ceramic catalytic converter that is cheaper than the metal honeycomb converter and is significantly superior in vibration resistance and heat load resistance to the conventional ceramic converter.

(Ninth Embodiment) A ninth embodiment of the present invention is shown in FIG.
This will be described with reference to FIGS. FIG. 39 is a perspective view of the catalytic converter 900 of the present invention. This ceramic catalytic converter 900 includes a ceramic honeycomb carrier 90.
The holding member 903 is arranged along the outer peripheral side surface of No. 1 and then press-fitted into the metal outer cylinder 902. The outer cylinder 902 is made of a heat-resistant stainless steel plate having a small linear expansion coefficient of 1.5 to 2 mm or a steel pipe, and has an inner diameter of 75 mm and a length of 65 mm.

In this embodiment, SUS430 is used, but
It is not limited to this. Further, the ceramic honeycomb carrier 901 is made of cordierite with a diameter of 71 mm, a total length of 60 mm, a cell size of 400 cpi, and a cell wall thickness of 0.1 to 0.2 mm. FIG. 40 is a sectional view of the ceramic catalytic converter of FIG. 39. The holding member 9 described above
03 is made of a heat-resistant stainless steel flat plate having a high linear expansion coefficient, and in this embodiment, it is made of SUS310, but is not limited to this.

One end of this flat plate is processed into a taper shape 904 so that the thickness gradually decreases. The ceramic honeycomb carrier 901 is arranged so as to surround the ceramic honeycomb carrier 901 at room temperature, and the both ends are arranged to overlap each other. In addition to the shape shown in FIG. 39, the holding member 903 may have a configuration in which, as shown in FIG. 42, both ends of a flat plate are tapered so that the thickness gradually decreases. At the normal temperature, the taper tips are arranged so that they overlap each other.

The inclination angle of the taper in this embodiment is 30-.
It is 45 °. However, the present invention is not limited to this, and as will be described later, a plate thickness and a taper inclination angle that can provide a displacement amount capable of holding the ceramic honeycomb carrier at a high temperature may be used. The operation of the present embodiment will be described. The ceramic catalytic converter arranged in the exhaust gas passage reaches a high temperature of 950 ° C. or higher due to the exhaust gas heat and the catalytic reaction heat accompanying exhaust gas purification. At this time, the ceramic honeycomb carrier 901 has a small linear expansion coefficient (1.2 × 1
0 ^-6), whereas is composed of cordierite, the outer tube 902 is made of heat-resistant stainless steel such as SUS430, is large linear expansion coefficient of the ceramic-made honeycomb support (1.1 × 10 ^{- 5} ), a large difference in thermal expansion between the two causes clearance.

In this embodiment, the holding member 903 shown in FIG. 40 is made of a material having a linear expansion coefficient larger than that of stainless steel used for the outer cylinder 902, for example, SUS310. As indicated by 41, an expansion amount larger than the expansion amount of the outer cylinder 902 in the circumferential direction is generated. This excess extension amount is deformed toward the ceramic honeycomb carrier 901 side along the tapered shape in which the holding members 903 overlap.

Therefore, one end of the holding member 903 is displaced in the direction in which the pressing force is applied to the outside, and the other end is displaced in the direction in which the pressing force is applied to the ceramic honeycomb carrier 901. Due to the above thermal expansion of the holding member 903, the outer cylinder 9
02 and the ceramic honeycomb carrier 901 absorb the clearance generated by the difference in the amount of thermal expansion of the ceramic honeycomb carrier 901, and reliably hold the ceramic honeycomb carrier 901.

The holding member 903 can be used reversibly because it returns to its original shape when the temperature drops. Since the holding member 903 of the embodiment shown in FIG. 42 is tapered at both ends so that the thickness thereof gradually decreases, it is possible to smoothly deform as shown in FIG. In this embodiment, the holding member 903 is wound once around the outer circumference of the ceramic honeycomb carrier 901. However, the present invention is not limited to this, and the holding member 903 may be wound around the outer circumference of the ceramic honeycomb carrier 901.
It may be wound more than once. In this case, one end of the winding end of the holding member is joined to the outer cylinder 903 by a mechanical joining means such as welding or brazing, and a fixed end when the ceramic honeycomb carrier is deformed in the circumferential direction by thermal expansion. It is preferable to provide it.

In this example, the holding member utilizing the difference in thermal expansion between different materials can be used to reliably hold the ceramic honeycomb carrier under any temperature environment. Since the retention force is less likely to decrease due to heat deterioration that is found in a general inorganic elastic body as a holding member, it can be used under a high temperature condition of 950 ° C. or higher and the holding performance can be maintained for a long time. As a result, it is possible to provide a catalytic converter that is cheaper than the metal honeycomb converter and is significantly superior to the conventional ceramic converter in vibration resistance and heat resistance load resistance.

(Tenth Embodiment) FIG. 44 is a perspective view of a catalytic converter 1000 according to this embodiment. The ceramic honeycomb carrier 1001 is inserted into a cylindrical outer cylinder 1002 via a corrugated plate-shaped holding member 1003. The ceramic honeycomb carrier 1001 has a diameter of 66 mm and a total length of 60.
mm, cell size 400 cpi, cell wall thickness 0.1 to 0.
Made of cordierite at 2 mm. The outer cylinder 1002 is made of a heat-resistant stainless steel plate or a steel pipe having a thickness of 1.5 to 2 mm and a small linear expansion coefficient. In this embodiment, the product is made of SUS430, but it is not limited to this. Holding member 1
003 is made of at least one kind of heat-resistant stainless steel foil, steel plate or steel pipe having a large linear expansion coefficient. In this embodiment, S
The case where US310 is used and the plate thickness is 0.1 to 1.5 mm, the wave height is 3 mm, and the wave pitch is 2.5 mm is shown. Absent. It is sufficient that these conditions are a combination sufficient to obtain the effects described below.

A part of the holding member 1003 is an outer cylinder 1002.
And no gaps are created. Mechanical joining such as laser beam joining or brazing is effective. In this example, laser beam bonding was used. Figure 44
The line 1004 at is the laser beam trace. The ceramic honeycomb carrier 1001 is press-fitted into the holding member 1003. In this embodiment, the press-fitting margin is set to 0.8 mm, but it is not limited to this.

The operation of this embodiment will be described. Ceramic catalytic converter 100 disposed in the exhaust gas path
0 is 95 due to the heat of exhaust gas and the heat of catalytic reaction during purification.
Reach high temperatures above 0 ° C. At this time, the ceramic honeycomb carrier 1001 has a small linear expansion coefficient (1.2 × 1).
0 ^-6), whereas is composed of cordierite, the outer cylinder 1002 is made of heat-resistant stainless steel such as SUS430, is large linear expansion coefficient of the ceramic-made honeycomb support (1.1 × 10 ^-5 ), A large difference in thermal expansion occurs between the two.

In this embodiment, the holding member 1003 is S
Large linear expansion coefficient such as US310 (1.7 × 1
0 ^-5 ) Made of heat-resistant stainless steel, holding member 1 at high temperature
003 expands toward the ceramic honeycomb carrier 1001 side, and the sum of the expansion amount and the press-fitting margin compensates for the decrease in the holding amount caused by the difference in the thermal expansion amount between the carrier 1001 and the outer cylinder 1002, and ensures the carrier 1001. Acts to hold on. Since the deformation recovers when the temperature decreases, the carrier 100
There is no danger that 1 will be damaged by being pressed more than necessary.

In this embodiment, by using the holding member having a large thermal expansion amount with respect to the outer cylinder, the ceramic honeycomb carrier can be reliably held under any temperature environment. Since there is little decrease in holding force due to heat deterioration that is found in a general inorganic elastic body as a holding member, it can be used under high temperature conditions of 950 ° C. or higher, and the holding performance can be maintained for a long time. As a result, it is possible to provide a catalytic converter that is cheaper than a metal catalytic converter and is significantly superior in vibration resistance and heat load resistance to a conventional ceramic catalytic converter.

(Eleventh Embodiment) An eleventh embodiment of the present invention will be described with reference to FIGS. 45 to 48. 45 is a front sectional view of a ceramic catalytic converter 1100 according to an eleventh embodiment of the present invention, and FIG. 46 is a diagram showing a state where the ceramic catalytic converter 1100 is disposed in the high temperature exhaust gas of FIG.

FIG. 47 is a schematic view of the holding member 1140 employed in FIGS. 45 and 46. FIG. 48 is a front sectional view showing another embodiment of the ceramic catalytic converter 1100 of the eleventh embodiment of the present invention. In the ceramic catalytic converter 1100 of the eleventh embodiment of the present invention, a cordierite honeycomb carrier 1120 having a diameter of 71 mm and a length of 60 mm, which has 400 conduction paths per inch in the exhaust gas flow direction, has a plate thickness of 1.5 mm. Is fixed to a cylindrical heat-resistant stainless steel outer cylinder 1130 through a ceramic honeycomb carrier cushion member 1150. The cushion member 1150 is made of, for example, a ceramic fiber mat or a heat-resistant stainless steel foil having a Fe—Cr—Al composition and has a plate thickness of 0.03 to 0.20 mm and a wave pitch of 2.
It is composed of a corrugated plate having a size of 5 mm and a wave height of about 2 mm. The outer diameter of the ceramic honeycomb carrier 1120 is the outer cylinder 113.
The inner diameter of the protective member 1150 is smaller than 0, and the protective member 1150 is 0.3 to 0.8 m which does not damage the ceramic honeycomb carrier.
It has a press-fitting margin of m. Furthermore, the outer cylinder 1130 includes
The deformation restricting member 1131 that restricts the ceramic honeycomb carrier 1120 from protruding in the exhaust gas flow direction is the outer cylinder 11.
It is joined to both ends of 30. This deformation regulating member 113
Reference numeral 1 denotes a ring shape or a plurality of strip shapes. At least one holding member 1140 is attached between the deformation regulating member on at least one side of the two deformation regulating members 1131 and the ceramic honeycomb carrier 1120.

FIGS. 45 and 46 show an example in which one sheet is attached, and FIG. 48 shows an example in which two sheets are attached. The outer diameter of the holding member 1140 is configured to be substantially the same as the inner diameter of the outer cylinder 1130. The holding member 1140 is made of stainless steel (SUS304 or SU) having a larger thermal expansion coefficient than the outer cylinder 1120.
S310 etc.). In this embodiment, the outer cylinder 1
130 is assumed to be stainless steel made of SUS430, but the invention is not limited to this. For example, SUS41
0, Fe-20Cr-5Al, etc. are considered. Further, the holding member 1140 is processed into a spiral shape or a C-shaped annular shape as shown in FIG.

Further, at least one end side in the circumferential direction of the holding member 1140 is processed with an inclined portion 1145 whose thickness is gradually reduced, and the inclined portion 1145 is constructed so as to overlap with the other end. In this embodiment, the angle of the inclined portion 1145 is set to 30 to 45 °. However, the present invention is not limited to this, and as described later,
Any plate thickness and taper inclination angle can be obtained so as to obtain a displacement amount capable of holding the ceramic honeycomb carrier at a high temperature.

The operation of this embodiment will be described. The ceramic catalytic converter of this embodiment is attached to the exhaust path and functions as a catalyst. When driving a vehicle under high load,
Ceramic catalytic converters are exposed to high temperatures. When used at high temperatures, the ceramic catalytic converter consists of an outer cylinder with a large coefficient of thermal expansion and a honeycomb carrier made of cordierite with a small coefficient of thermal expansion. There is a problem that a clearance occurs and the ceramic honeycomb carrier is damaged. The ceramic catalytic converter of this embodiment is
The structure is characterized in that the ceramic honeycomb carrier is fixed by the pressing force obtained by the deformation of the holding member in the exhaust gas flow direction in a high temperature environment.

The outer diameter of the holding member is substantially the same as the inner diameter of the outer cylinder, and the coefficient of thermal expansion is larger than that of the outer cylinder. Therefore, the amount of deformation of the ceramic honeycomb carrier in the radial direction is large. Is limited to the outer cylinder. Therefore, the holding member is deformed so that the overlapping amount of the ends in the circumferential direction of the holding member having a spiral or C-ring shape becomes large. By this deformation of the holding member, the ceramic honeycomb carrier is fixed in the exhaust gas flow direction as shown in FIG.

In order to obtain a uniform pressing force, FIG.
As shown in the figure, two holding members are used.
It is conceivable to use them shifted by 80 degrees. In addition, the ceramic honeycomb carrier has two overlapping parts on both ends.
Similar effects can be obtained even when they are arranged with a shift of 0 degree. Further, the holding force of the ceramic honeycomb carrier can be changed by changing the angle and plate thickness of the inclined portion of the holding member,
It can be adjusted to any strength.

(Twelfth Embodiment) The twelfth embodiment of the present invention will be described with reference to FIGS. 49 to 53. FIG. 49 shows a perspective view of a ceramic catalytic converter 1200 of the twelfth embodiment. The ceramic honeycomb carrier 1201 has a side surface covered with a corrugated plate 1202 and is press-fitted into an outer cylinder 1203, and at least one holding member 1204 is provided at least at an upstream or downstream opening end of the outer cylinder 1203, preferably a radial shape. Will be installed in multiple locations.

FIG. 50 shows a ceramic catalytic converter 120.
0 shows a sectional view in the axial direction of 0. The holding member 1204 is made of two types of strip-shaped metal plates having different linear expansion coefficients which are superposed and joined to each other.
It is made of a material 1205 having a small linear expansion coefficient on one side and a material 1206 having a large linear expansion coefficient on the other side, and is arranged so as to be in contact with the edge of the end face of the ceramic honeycomb carrier 1201 via the corrugated plate 1202 without any gap.

In this embodiment, as shown in FIGS.
A notch 1209 is formed in a part of the open end of the outer cylinder 1203 so as to form a strip shape, a ceramic honeycomb carrier 1201 side is made of a material 1205 having a small linear expansion coefficient, and a material 1206 having a large linear expansion coefficient is joined to the material 1205. 1204
And FIG. 51 shows an example in which the holding member 1214 is formed by making the tip of a material 1215 having a small linear expansion coefficient on the side of the ceramic honeycomb carrier 1201 into a holding member 1214. It has a structure of supporting the edge of the end face of the ceramic honeycomb carrier 1201. If so, this is not the case.

In this embodiment, the ceramic honeycomb carrier 1201 is made of cordierite with a diameter of 66 mm, a total length of 60 mm, a cell size of 400 cpi, and a cell wall thickness of 0.1 to 0.2 mm, and the corrugated plate 1202 is made of Fe--Cr--. A heat-resistant stainless steel foil having an Al composition and a plate thickness of 0.03 to
The outer cylinder 1203 is a heat-resistant stainless steel plate having a small linear expansion coefficient or a SUS430 having a steel pipe thickness of 1.5 mm, and the holding member 1204 is , Heat-resistant stainless steel plate SUS430, for materials with small linear expansion coefficient,
A heat-resistant stainless steel plate SUS310 is used for the material 1206 having a large linear expansion coefficient, both of which have a thickness of 1.5 mm and a length of 4
Although the width is 0 mm and the width is 10 mm, the material and the thickness are not limited to these.

The operation of this embodiment will be described below. The ceramic catalytic converter is heated to a high temperature of 950 ° C. or higher due to exhaust gas heat from the engine and catalytic reaction heat. At this time, the linear expansion coefficient of cordierite forming the ceramic honeycomb carrier 1201 is 1.2 × 10 ⁻⁶ , whereas the metal forming the outer cylinder 1203, such as SUS430.
Has a linear expansion coefficient of 1.1 × 10 ⁻⁵ , and a clearance is generated between the ceramic honeycomb carrier 1201 and the outer cylinder 1203 due to the difference in the linear expansion coefficient between the two. Holding member 1
Nos. 204 and 1214 are different in the linear expansion coefficient of the constituent materials under high temperature (in this example, the material 1205 having a small linear expansion coefficient on the ceramic honeycomb carrier 1201 side has a linear expansion coefficient of 1.1 × 10 ⁻⁵ , On the other hand, the material 1206 having a large linear expansion coefficient has a linear expansion coefficient of 1.7 × 10 ⁻⁵ ), which is curved toward the material 1205 or 1215 having a small linear expansion coefficient as shown in FIGS. The edge of the end face of the carrier 1201 is supported in the axial direction and the radial direction at the same time to prevent the ceramic honeycomb carrier 1201 from slipping and dropping from the outer cylinder 1203. As in this embodiment, since the holding members 1204 and 1214 are made of a highly heat-resistant metal, the ceramic honeycomb carrier 1201 can be securely held in the outer cylinder 1203 without dropping out even at a high temperature of 950 ° C. or higher. It is possible to provide a ceramic catalytic converter having excellent heat resistance and vibration resistance.

Thus, the holding members 1204 and 12
By supporting the edge of the end surface of the ceramic honeycomb carrier 1201 from an oblique direction toward the center, the nozzle 14 can prevent axial and radial deviations at the same time. (Thirteenth Embodiment) The thirteenth embodiment of the present invention will be described with reference to FIGS. 54 to 59.

FIG. 54 is a perspective view of a ceramic catalytic converter 1300 showing the 13th embodiment of the present invention. The ceramic honeycomb carrier 1311 is inserted in a cylindrical outer cylinder 1312 via a holding member 1313. Ceramic honeycomb carrier 1311 has a diameter of 66 mm and a total length of 6
0 mm, cell size 400 cpi, cell wall thickness 0.1
Made of cordierite at 0.2 mm. The outer cylinder 1312 is made of a heat-resistant stainless steel plate or steel pipe having a small linear expansion coefficient and a thickness of 1.5 to 2 mm. In this embodiment, SUS43
Although it is set to 0, it is not limited to this.

FIG. 55 is a sectional view of the ceramic catalytic converter 1310 of FIG. The holding member 1313 includes the outer peripheral surface of the ceramic honeycomb carrier 1311 and the outer cylinder 1312.
The inner peripheral surfaces of the two are in contact with each other, and are inserted so that no gap is formed between them, and at least one place is joined at the portion in contact with the outer cylinder. It is fixed to the outer cylinder. Holding member 1313
Is a type in which two metal plates having different linear expansion coefficients are superposed on each other and joined at both ends. A material 1314 having a small linear expansion coefficient is provided on the side facing the ceramic honeycomb carrier, and a large linear expansion coefficient is provided on the other side. The metal 1315 is configured to be located.

In this embodiment, the material 13 having a small coefficient of linear expansion is used.
SUS430 as 14 is a metal 1 having a large linear expansion coefficient.
Although SUS310 is used as 315 and the center angle of the arc-shaped holding member 1313 is set to 90 to 120 °, the present invention is not limited to this. It is sufficient that these conditions are a combination sufficient to obtain the effects described below.

The ceramic catalytic converter 1300 may have a structure in which a plurality of holding members are arranged as shown in FIG. 57, in addition to the structure shown in FIG. 58 is a cross-sectional view of FIG. 57. In FIG. 58, the ceramic catalytic converter 1310
Although an example in which the holding member 1313 constituting the above is arranged at two positions is shown, the number of the arranged holding members is not limited to this. When a plurality of holding members are arranged, they are preferably arranged at equal intervals in the circumferential direction, as shown in FIG.

The operation of the ceramic catalytic converter 1300 of the thirteenth embodiment of the present invention will be described. The ceramic catalytic converter arranged in the exhaust gas passage reaches a high temperature of 950 ° C. or higher due to the exhaust gas heat and the catalytic reaction heat accompanying exhaust gas purification. At this time, the ceramic honeycomb carrier 13
11 is made of cordierite having a small linear expansion coefficient (1.2 × 10 ⁻⁶ ), while the outer cylinder 1312 is made of S.
Since it is made of heat-resistant stainless steel such as US430 and has a large linear expansion coefficient (1.1 × 10 ⁻⁵ ) with respect to a ceramic honeycomb carrier, a large clearance is generated between the two due to a large thermal expansion difference.

In the thirteenth embodiment of the present invention, the holding member 1313 is made by superposing two kinds of materials having different linear expansion coefficients and joining the both ends, as shown in FIGS. Then, as shown in FIGS. 56 and 59, 1315 made of a material having a large linear expansion coefficient is curved toward the outer cylinder side, and 1314 made of a material having a small linear expansion coefficient is formed on the outer periphery of the ceramic honeycomb carrier. Along with the result that the holding member 1313 deforms in a crescent shape,
The clearance generated by the difference in thermal expansion between the carrier 1311 and the outer cylinder 1312 is absorbed, and the carrier 1311 is reliably held. Moreover, since this deformation returns to the original shape when the temperature decreases, it can be used reversibly.

In this embodiment, the holding member utilizing the difference in thermal expansion between different kinds of materials can be used to reliably hold the ceramic honeycomb carrier under any temperature environment. Since there is little decrease in holding force due to heat deterioration that is found in a general inorganic elastic body as a holding member, it can be used under high temperature conditions of 950 ° C. or higher and the holding performance can be maintained for a long time.
As a result, it is possible to provide a ceramic catalytic converter that is cheaper than the metal honeycomb converter and is significantly superior in vibration resistance and heat load resistance to the conventional ceramic converter.

(Fourteenth Embodiment) A fourteenth embodiment of the present invention will be described with reference to FIGS. 60 to 63. FIG. 60 is a front sectional view of a ceramic catalytic converter 1400 according to a fourteenth embodiment of the present invention, and FIG. 61 shows a state in which FIG. 60 is arranged in high-temperature exhaust gas.

FIG. 62 is a schematic view of the holding member 1440 employed in FIGS. 60 and 61. FIG. 63 is a front sectional view showing another embodiment of the ceramic catalytic converter 1400 of the fourteenth embodiment of the present invention. In a ceramic catalytic converter 1400 which is a fourteenth embodiment of the present invention, a cordierite honeycomb carrier 420 having a diameter of 71 mm and a length of 60 mm, which has 400 conduction paths per inch in the exhaust gas flow direction, has a plate thickness of 1.5 mm. Is press-fitted and fixed to a cylindrical heat-resistant stainless steel outer cylinder 1430 via a ceramic honeycomb carrier cushion member 1450. The cushion member 1450 is made of, for example, a ceramic fiber mat or a heat-resistant stainless steel foil having a Fe—Cr—Al composition, a plate thickness of 0.03 to 0.20 mm, and a wave pitch of 2.
It is composed of a corrugated plate having a size of 5 mm and a wave height of about 3 mm.

The outer diameter of the ceramic honeycomb carrier 1420 is smaller than the inner diameter of the outer cylinder 1430, and the protective member 1450 is used.
Is 0 to the extent that the ceramic honeycomb carrier is not damaged.
It has a press-fitting margin of 3 to 0.8 mm. Further, the outer cylinder 1430 has a deformation restricting member 14 for restricting protrusion of the ceramic honeycomb carrier 1420 in the exhaust gas flow direction.
31 is joined to both ends of the outer cylinder 1430. The deformation restricting member 1431 has a ring shape or a plurality of strip shapes. At least one holding member 1440 is attached between the deformation regulating member on at least one side of the two deformation regulating members 1431 and the ceramic honeycomb carrier 1420. 60 and 61 show the case where one sheet is attached, and FIG. 63 shows the case where two sheets are attached. This holding member 1440 is
As shown in FIG. 62, stainless steel 1 having a large linear expansion coefficient
441 (SUS340 or SUS310, etc.) and small stainless steel 1442 (SUS430 or SUS41)
0 or Fe-20Cr-5Al). The holding member 1440 has a spiral shape or a C shape so that the metal 1442 having a small linear expansion coefficient is located on the inner peripheral side and the metal 1441 having a large linear expansion coefficient is located on the outer peripheral side.
After processed into a ring shape, at least both ends are joined by mechanical joining such as laser beam joining or brazing.

At least one end portion in the circumferential direction of this holding member is processed with an inclined portion 1445 whose thickness is gradually reduced, and the inclined portion 1445 is constructed so as to overlap with the other end. In this embodiment, the inclined portion 1445
The angle was 30 to 45 °. However, the present invention is not limited to this, and as will be described later, a plate thickness and a taper inclination angle that can provide a displacement amount capable of holding the ceramic honeycomb carrier at a high temperature may be used.

Next, the operation of this embodiment will be described. The ceramic catalytic converter of this embodiment is attached to the exhaust path and functions as a catalyst. During high load operation of the vehicle, the ceramic catalytic converter is exposed to high temperatures. When used at high temperatures, the ceramic catalytic converter consists of an outer cylinder with a large coefficient of thermal expansion and a honeycomb carrier made of cordierite with a small coefficient of thermal expansion. There is a problem that a clearance occurs and the ceramic honeycomb carrier is damaged.

The ceramic catalytic converter of this embodiment is
The structure is characterized in that the ceramic honeycomb carrier is fixed by the pressing force obtained by the deformation of the holding member in the exhaust gas flow direction in a high temperature environment. This holding member is composed of two kinds of metals having different thermal expansion coefficients, and the metal having a small linear expansion coefficient is located on the inner peripheral side and the metal having a large linear expansion coefficient is located on the outer peripheral side. The holding member is deformed so as to reduce the inner diameter of the spiral or C-ring shape due to the difference in thermal expansion coefficient between the two. Therefore, the holding member is
It deforms in a direction in which the overlapping amount of the ends in the circumferential direction increases. As a result, the holding member absorbs the clearance generated at the end faces of the deformation regulating member and the ceramic honeycomb carrier,
As shown in FIG. 61, it can be securely held.

In order to obtain a uniform pressing force, the pressure shown in FIG.
As shown in the figure, two holding members are used.
It is conceivable to use them shifted by 80 degrees. In addition, the ceramic honeycomb carrier has two overlapping parts on both ends.
Similar effects can be obtained even when they are arranged with a shift of 0 degree. Further, the holding force of the ceramic honeycomb carrier can be changed by changing the angle and plate thickness of the inclined portion of the holding member,
It can be adjusted to any strength.

As described above, since the holding member 1440 is made of a highly heat-resistant metal, the ceramic honeycomb carrier 1420 can be securely held in the outer cylinder 1430 even at a high temperature of 950 ° C. or higher. ,Heat-resistant,
It is possible to provide a ceramic catalytic converter having excellent vibration resistance. (15th Embodiment) The 15th embodiment of the present invention will be described with reference to FIGS.

FIG. 64 is a development view showing an assembled state of each component constituting the ceramic catalytic converter 1500 of the fifteenth embodiment of the present invention, and FIG. 65 is an axial sectional view. The ceramic honeycomb carrier 1501 is inserted in a cylindrical outer cylinder 1502, and at least one end surface of the ceramic honeycomb carrier 1501 has a holding member 1 having an outer diameter substantially equal to that of the ceramic honeycomb carrier 1501.
503 is incorporated. A substantially annular deformation regulating member 1504 is joined and fixed to both end surfaces of the outer cylinder 1502 on the outer side of the holding member 1503.
1 and the holding member 1503 are prevented from protruding from the outer cylinder 1502. The ceramic honeycomb carrier 1501 has a diameter of 66 mm, a total length of 60 to 100 mm, and a cell size of 400.
It is made of cordierite with a cpi and a cell wall thickness of 0.1 to 0.2 mm.

The outer cylinder 1502 is made of a heat-resistant stainless steel plate or steel pipe having a small linear expansion coefficient and a thickness of 1.5 to 2 mm. In this embodiment, the product is made of SUS430, but it is not limited to this. Ceramic honeycomb carrier 150
The end surface of No. 1 and the holding member 1503 are configured so as to be in contact with each other at least in part so that no gap is formed between them. Similarly, the holding member 1503 and the deformation regulating member 150
4 is also in contact with each other at least in part so that no gap is formed between them. The holding member 1503 is assembled in a compressed state to the extent that it is elastically deformed in the axial direction of 0.2 to 0.8 mm. 64 and 65 show an example in which the holding member 1503 is provided at both the upstream and downstream opening ends, but a configuration in which the holding member 1503 is provided only at either the upstream side or the downstream side is also possible. Is.

The holding member 1503 will be described in detail. The holding member 1503 has a substantially annular shape having a wavy profile along the circumferential direction. The holding member 1 shown in FIG.
503 shows an enlarged view of 503. The holding member 1503 has a thickness of 0.
A substrate 1505 made of a material having a relatively small linear expansion coefficient of 05 to 1 mm (SUS430 in this embodiment) is also used, and a material having a thickness of 0.05 to 1 mm and a large linear expansion coefficient as compared with the substrate 1505 (in this embodiment, It has a structure in which thin plates 1506 made of SUS310) are joined. The thin plates 1506 are installed inside all the bent portions of the substrate 1505. In addition to the materials described here, any combination of materials that can withstand the environment in which the ceramic catalytic converter is used, have excellent bondability with each other, and have a large difference in linear expansion coefficient can be similarly used.

The deformation regulating member 1504 is a substantially annular member having a sufficient strength against the stress due to the expansion deformation of the ceramic honeycomb carrier 1501, the outer cylinder 1502, and the holding member 1503 under high temperature, and is fixed to the outer cylinder 1502. Has been done. The material here is the same as that of the outer cylinder 1502, but other materials can be used as long as there is no problem with the bondability, heat resistance, or the like. As shown in FIG. 66, the deformation regulating member 1504 and the holding member 1503 are joined to each other in the range where the thin plate 1506 is not joined.

The operation of this embodiment will be described. The ceramic catalytic converter arranged in the exhaust gas passage reaches a high temperature of 950 ° C or higher due to the heat of the exhaust gas and the heat of catalytic reaction during purification. At this time, the honeycomb carrier 15 made of ceramic
01 is made of cordierite having a small linear expansion coefficient (1.2 × 10 ⁻⁶ ), while the outer cylinder 1502 is made of S.
Since it is made of heat-resistant stainless steel such as US430 and has a large linear expansion coefficient (1.1 × 10 ⁻⁵ ) with respect to a ceramic honeycomb carrier, a large thermal expansion difference occurs between the two.

In this embodiment, the holding member 1503 is formed by joining two kinds of materials having different linear expansion coefficients as described above. Sheet 1506 when exposed to high temperatures
Has a larger expansion amount than the substrate 1505, the substrate 150
Each bend of 5 is widened. Since the portion fixed to the deformation regulating member 1504 cannot be displaced, as a result, FIG.
As shown in FIG. 7, the axial length of the holding member 1503 is increased, which operates so as to fill the difference in thermal expansion amount between the carrier 1501 and the outer cylinder 1502, and prevents the generation of an axial gap. When the temperature decreases, each component contracts and returns to the original shape and size, but in the process, no axial gap is generated and the carrier 1501 is always held securely.

In this embodiment, the holding member utilizing the difference in thermal expansion between different kinds of materials can be used to reliably hold the ceramic honeycomb carrier under any temperature environment. There is little decrease in holding force due to heat deterioration, which is seen in a general inorganic elastic body as a holding member, and there is no problem that it creeps at high temperature like a metal spring and cannot withstand repeated use.
Therefore, it can be used under high temperature conditions of 950 ° C. or higher, and the holding performance can be maintained for a long period of time. As a result, it is possible to provide a ceramic catalytic converter that is less expensive than the metal honeycomb converter and is extremely excellent in vibration resistance and heat load resistance as compared with the conventional ceramic converter.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a catalytic converter according to a first embodiment.

FIG. 2 is a partial cross-sectional view showing the mounting of a catalytic converter.

FIG. 3 is a partial cross-sectional view showing the mounting of a catalytic converter.

FIG. 4 is a cross-sectional view showing the mounting structure of the catalyst tumbler of the first embodiment.

FIG. 5 is a schematic view showing the development of the outer cylinder of the first embodiment.

6 (a) and 6 (b) are schematic views showing a holding member of the first embodiment.

7 (a), (b), (c) and (d) are explanatory views showing other welding patterns of the holding member.

FIG. 8 is an explanatory diagram for explaining assembly of the catalytic converter of the first embodiment.

FIG. 9 is a schematic diagram showing a welded portion of an outer cylinder of the catalytic converter according to the first embodiment.

FIG. 10 is a schematic diagram showing another development of the outer cylinder of the catalytic converter.

FIG. 11 is an enlarged view of a holding portion of the catalytic converter according to the first embodiment.

FIG. 12 is a schematic diagram showing another cushion member of the catalytic converter of the first embodiment.

FIG. 13 is a development view showing an assembled state of the catalytic converter of the second embodiment.

FIG. 14 is a side view of the catalytic converter of the second embodiment.

FIG. 15 is a sectional view of a catalytic converter according to a third embodiment.

FIG. 16 is a side view of a catalytic converter according to a third embodiment.

FIG. 17 is a schematic diagram of a holding member according to a third embodiment.

FIG. 18 is an explanatory diagram for explaining the operation of the catalytic converter of the third embodiment.

FIG. 19 is a schematic diagram of a catalytic converter according to a fourth embodiment.

FIG. 20 is a sectional view of a catalytic converter according to a fourth embodiment.

FIG. 21 is a schematic diagram of a catalytic converter of another embodiment of the fourth embodiment.

FIG. 22 is a sectional view of a catalytic converter according to another embodiment of the fourth embodiment.

23 (a) and 23 (b) are explanatory views for explaining the deformation of the holding member of the fourth embodiment.

24 (a) and 24 (b) are explanatory views for explaining the operation of the catalytic converter shown in FIG.

25 (a) and (b) are explanatory views for explaining the operation of the catalytic converter shown in FIG.

FIG. 26 is a schematic view showing the shape of a holding member of another embodiment with respect to the fourth embodiment.

FIG. 27 is a development view showing an assembled state of the catalytic converter of the fifth embodiment.

FIG. 28 is a sectional view of a catalytic converter according to a fifth embodiment.

FIG. 29 is a front view of a catalytic converter according to a sixth embodiment.

30 (a), 30 (b), and 30 (c) are schematic views of a holding member of the sixth embodiment.

FIG. 31 is an explanatory diagram for explaining the operation of the catalytic converter of the sixth embodiment.

FIG. 32 is a side view of the catalytic converter of the seventh embodiment.

FIG. 33 is an explanatory view for explaining the action of the catalytic converter of the seventh embodiment.

FIG. 34 is an explanatory view explaining the operation of the catalytic converter of the seventh embodiment.

FIG. 35 is a front sectional view of a catalytic converter according to an eighth embodiment.

FIG. 36 is a side view of the catalytic converter of the eighth embodiment.

FIG. 37 is a schematic diagram of a holding member according to an eighth embodiment.

FIG. 38 is a side view of a catalytic converter showing another embodiment of the eighth embodiment.

FIG. 39 is a perspective view showing an assembled state of the catalytic converter of the ninth embodiment.

FIG. 40 is a partial cross-sectional view of the catalytic converter of the ninth embodiment.

FIG. 41 is a partial cross-sectional view of the catalytic converter of the ninth embodiment.

FIG. 42 is a partial cross-sectional view showing another embodiment of the holding member of the ninth embodiment.

FIG. 43 is a partial cross-sectional view showing another embodiment of the holding member of the ninth embodiment.

FIG. 44 is a perspective view showing a catalytic converter according to a tenth embodiment.

FIG. 45 is a sectional view of a catalytic converter of the eleventh embodiment.

FIG. 46 is an explanatory view for explaining the operation of the catalytic converter of the eleventh embodiment.

FIG. 47 is a schematic view showing a holding member of the eleventh embodiment.

FIG. 48 is a schematic diagram showing a catalytic converter as another embodiment of the eleventh embodiment.

FIG. 49 is a perspective view showing a catalytic converter according to a twelfth embodiment.

FIG. 50 is a sectional view showing a catalytic converter of a twelfth embodiment.

FIG. 51 is a schematic view of a catalytic converter as another embodiment of the twelfth embodiment.

FIG. 52 is an explanatory view for explaining the operation of the catalytic converter of the twelfth embodiment.

FIG. 53 is an explanatory view for explaining the action of a catalytic converter as another embodiment of the twelfth embodiment.

FIG. 54 is a perspective view showing an assembled state of the catalytic converter of the thirteenth embodiment.

FIG. 55 is a sectional view of a catalytic converter according to a thirteenth embodiment.

FIG. 56 is an explanatory view for explaining the operation of the thirteenth embodiment.

FIG. 57 is a perspective view of a catalytic converter as another embodiment of the thirteenth embodiment.

58 is a cross-sectional view of the catalytic converter shown in FIG. 57.

FIG. 59 is an explanatory view for explaining the operation of another embodiment of the thirteenth embodiment.

FIG. 60 is a front sectional view of a catalytic converter according to a fourteenth embodiment.

FIG. 61 is an explanatory view for explaining the operation of the catalytic converter of the fourteenth embodiment.

FIG. 62 is a schematic view of a holding member of the 14th embodiment.

FIG. 63 is a front sectional view of a catalytic converter of another embodiment with respect to the fourteenth embodiment.

FIG. 64 is a development view showing an assembled state of the catalytic converter of the fifteenth embodiment.

FIG. 65 is a sectional view of a catalytic converter according to a fifteenth embodiment.

FIG. 66 is an enlarged view of a holding member of the catalytic converter of the fifteenth embodiment.

FIG. 67 is an explanatory view for explaining the action of the holding member of the fifteenth embodiment.

[Explanation of symbols]

 1 Ceramic Catalytic Converter 2 Ceramic Honeycomb Carrier 4 Outer Cylinder 5 Holding Member

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location F01N 3/28 301 U 311 SN (72) Inventor Tetsuya Toriyao 1-chome Showa-cho, Kariya city, Aichi prefecture No. 1 in Nihon Denso Co., Ltd. (72) Inventor Yuji Mori 1-1, Showa-machi, Kariya, Aichi Prefecture Nihon Denso Co., Ltd. (72) Inventor, Tatsuya Fujita 1-1, Showa-machi, Kariya, Aichi Co., Ltd. (72) Inventor Hiraki Matsumoto 1-1, Showa-cho, Kariya city, Aichi prefecture Nihon Denso Co., Ltd. (72) Inventor Hiroma Aoki 1-1-chome, Showa town, Kariya city, Aichi prefecture Nidec stock In-house (72) Inventor, Kinji Hohei, 1-1, Showa-cho, Kariya city, Aichi Prefecture Inside Nihon Denso Co., Ltd. (72) In-house, Naoki Nagata, 1-1, Showa-cho, Kariya city, Aichi prefecture Local Nihon Denso Co., Ltd. (72) Inventor Yushi Fukuda 1-1, Showamachi, Kariya city, Aichi Nihon Denso Co., Ltd.

Claims (37)

[Claims] 1. A ceramic honeycomb carrier, which is disposed in an exhaust path of an engine, and carries a catalyst for purifying harmful components of the exhaust gas of the engine, an outer cylinder containing the ceramic honeycomb carrier, and the ceramic. It is interposed between the honeycomb carrier made of honeycomb and the outer cylinder, and the metals having different linear expansion coefficients are combined, and the exhaust gas raises the temperature, so that the clearance between the honeycomb carrier made of ceramic and the outer cylinder is increased. A ceramic catalytic converter, comprising: a holding member that absorbs. 2. A ceramic catalytic converter arranged in an exhaust path of an engine, comprising a ceramic honeycomb carrier, a holding member for holding the ceramic honeycomb carrier, and an outer cylinder for housing the ceramic honeycomb carrier. The holding member is made of a metal plate having a linear expansion coefficient larger than that of the outer cylinder, and the holding member absorbs the clearance between the ceramic honeycomb carrier and the outer cylinder generated at a high temperature. Characteristic ceramic catalytic converter. 3. The holding member is SUS304, SUS
310, SUS430 or the like, the material of the holding member having a small linear expansion coefficient is ferritic stainless steel, and the material of the holding member having a large linear expansion coefficient is austenitic stainless steel. A ceramic catalytic converter according to claim 1 or 2, characterized in that: 4. The holding member is arranged near the outer peripheral side surface and / or near the end surface and / or inside the ceramic honeycomb carrier.
The ceramic catalytic converter according to any one of claims 1. 5. The holding member holds the ceramic honeycomb carrier by thermal expansion and deformation of the ceramic honeycomb carrier in a substantially radial direction and / or a substantially circumferential direction and / or a substantially axial direction. Claim 1
The described ceramic catalytic converter. 6. The ceramic catalytic converter according to claim 5, wherein the holding member holds the outer peripheral side surface of the ceramic honeycomb carrier. 7. The holding member is formed by joining band-shaped metal plates to each other, and the length of the holding member in the longitudinal direction is equal to or less than the circumferential length of the outer peripheral side surface of the ceramic honeycomb carrier, and preferably. 7. The ceramic catalytic converter according to claim 6, wherein the two or more are arranged on the same circumference. 8. The holding member is formed by joining band-shaped metal plates to each other, and the length of the holding member in the longitudinal direction is not less than the circumferential length of the outer peripheral side surface of the ceramic honeycomb carrier. The ceramic catalytic converter according to claim 6, wherein the ceramic honeycomb carrier is linearly arranged on the outer peripheral side surface of the ceramic honeycomb carrier. 9. A ceramic honeycomb carrier side of the holding member is formed of a metal plate having a small linear expansion coefficient, an outer cylinder side is formed of a metal plate having a large linear expansion coefficient, and the metal plates are joined together. The ceramic catalytic converter according to any one of claims 6 to 8, characterized in that: 10. In the ceramic catalytic converter, a holding member is disposed between the outer cylinder or a ring-shaped or band-shaped deformation restricting member inserted into the outer cylinder, and the ceramic honeycomb carrier, 10. The clearance between the cylinder or the deformation regulating member and the ceramic honeycomb carrier is configured to be equal to or less than a length that can be deformed by thermal expansion of the holding member.
The ceramic catalytic converter according to any one of claims 1. 11. The holding member according to claim 6, wherein at least one position is fixed to the outer cylinder.
The ceramic catalytic converter according to any one of claims 1. 12. The ceramic catalytic converter according to claim 5, wherein the holding member holds an end surface of the ceramic honeycomb carrier and / or a corner where the outer peripheral side surface of the ceramic honeycomb carrier intersects with the end surface. 13. The ceramic catalyst according to claim 12, wherein the holding member is formed by joining strip-shaped metal plates to each other, and preferably a plurality of the holding members are radially arranged on an end surface of the ceramic honeycomb carrier. converter. 14. The ceramic catalytic converter according to claim 12, wherein the holding member is formed by joining a ring-shaped or ring-shaped metal plate. 15. The ceramic honeycomb carrier side of the holding member is made of a metal plate having a small linear expansion coefficient, the opposite side is made of a metal plate having a large linear expansion coefficient, and the metal plates are joined to each other. 12. The method according to claim 12, wherein
4. The ceramic catalytic converter according to any one of 4 above. 16. The ceramic catalytic converter according to claim 12, wherein the holding member is formed by joining an annular ring having a small linear expansion coefficient only in the vicinity of an outer peripheral end surface of the annular ring having a large linear expansion coefficient. 17. The holding member is inserted between a part of the outer cylinder, or an annular or strip-shaped deformation restricting member connected to the outer cylinder, and the end face of the ceramic honeycomb carrier, 17. The clearance between the part or the deformation regulating member and the end face of the ceramic honeycomb carrier is configured to be equal to or less than a length that can be deformed by thermal expansion of the holding member. Ceramic catalytic converter. 18. The method according to claim 12, wherein at least one position of the holding member is fixed to the outer cylinder.
7. A ceramic catalytic converter according to any one of 1. 19. The ceramic catalytic converter according to claim 5, wherein the holding member is arranged so as to penetrate the inside of the ceramic honeycomb carrier in an arbitrary direction. 20. The ceramic honeycomb carrier is divided along any one or more planes or curved surfaces, and the holding member is disposed along the dividing surface of the ceramic honeycomb carrier. The described ceramic catalytic converter. 21. The holding member is formed by joining strip-shaped metal plates to each other, and preferably, a plurality of the holding members are arranged inside a ceramic honeycomb carrier. Item 21. A ceramic catalytic converter according to any one of items 19 to 20. 22. At least one position of the holding member is fixed to an outer cylinder.
1. The ceramic catalytic converter according to any one of 1. 23. The ceramic catalytic converter according to claim 1, wherein a joint portion is always present in an arbitrary cross section taken in a direction perpendicular to the longitudinal direction of the holding member. 24. The ceramic honeycomb carrier is held by the holding member being deformed in a substantially radial direction and / or a substantially circumferential direction and / or a substantially axial direction of the ceramic honeycomb carrier by thermal expansion. The ceramic catalytic converter according to claim 2. 25. The ceramic catalytic converter according to claim 24, wherein the holding member is composed of a corrugated plate formed of a heat-resistant stainless steel foil covering the outer peripheral side surface of the ceramic honeycomb carrier. 26. The corrugated sheet formed of heat-resistant stainless steel foil, which is the holding member, is joined by a mechanical joining means such as laser beam welding or brazing at a part of a contact portion with the outer cylinder. 26. The ceramic catalytic converter according to claim 25. 27. The holding member is composed of a flat plate formed of a heat-resistant stainless steel foil or a steel plate that covers an outer peripheral side surface of the ceramic honeycomb carrier, and the flat plate covers at least one outer peripheral side surface of the ceramic honeycomb carrier. ,
25. The ceramic catalytic converter according to claim 24, wherein at least one end side is preferably configured so that the thickness gradually decreases. 28. The holding member is composed of a flat plate formed of a heat-resistant stainless steel foil or a steel plate that covers the outer peripheral side surface of the ceramic honeycomb carrier, and the flat plate covers the outer peripheral side surface of the ceramic honeycomb carrier for one or more rounds. 25. The ceramic catalytic converter according to claim 24, wherein both ends are disposed so as to overlap each other, and preferably, at least one end side is configured so that the thickness gradually decreases. 29. The holding member is composed of two or more members, the first holding member is along the inner cylinder inner side surface, the second holding member is along the outer peripheral side surface of the ceramic honeycomb carrier, and 25. The first and second holding members are arranged so as to partially overlap each other, and preferably, the tip end shape of the overlapping portion of the first and second holding members has a wedge shape. The described ceramic catalytic converter. 30. The holding member has a C-shaped ring shape, and is configured such that at least one end side of the cut portion of the C-shaped portion gradually decreases in thickness, and preferably the cut portion of the C-shaped portion. 25. The ceramic catalytic converter according to claim 24, wherein the ceramic catalytic converters are arranged so as to overlap each other. 31. The holding member is inserted between a part of the outer cylinder, or an annular or strip-shaped deformation restricting member connected to the outer cylinder, and the end face of the ceramic honeycomb carrier, 31. The ceramic according to claim 25, wherein a clearance between the portion or the deformation restricting member and the end face of the ceramic honeycomb carrier is configured to be equal to or less than a length that can be deformed by thermal expansion of the holding member. Catalytic converter. 32. The holding member is composed of two or more members, and the first holding member is a part of the outer cylinder or a ring-shaped or band-shaped deformation restricting member connected to the outer cylinder. The second holding member is arranged along the end face of the ceramic honeycomb carrier, and the first and second holding members are arranged so as to partially overlap each other, preferably the overlapping portion of the first and second holding members. 25. The ceramic catalytic converter according to claim 24, characterized in that the tip end shape of the ceramic is wedge-shaped. 33. The ceramic catalytic converter according to claim 27, wherein a part of the holding member is fixed to an outer cylinder. 34. The ceramic catalytic converter according to claim 5, wherein the holding member is formed by combining two or more members. 35. The ceramic catalytic converter according to claim 1, wherein the joint portion of the holding member is provided by laser beam joining or brazing. 36. A cushion member made of a heat resistant metal foil or a heat resistant ceramic fiber mat is provided between the holding member and the ceramic honeycomb carrier or between the outer cylinder and the ceramic honeycomb carrier. The ceramic catalytic converter according to any one of claims 1 to 35, wherein: 37. When the holding member is composed of two or more kinds of heat resistant stainless steel, the surface of the holding member on the austenitic stainless steel side or the side having a large linear expansion coefficient is subjected to aluminum vapor deposition treatment. And also
The ceramic catalyst according to any one of claims 1 to 36, wherein when the holding member is made of one or more heat-resistant stainless steel, the surface of the one holding member is subjected to aluminum vapor deposition treatment. converter.