CN110195631B

CN110195631B - Exhaust gas purification device

Info

Publication number: CN110195631B
Application number: CN201910110033.4A
Authority: CN
Inventors: 畠山由章; 引地贤太郎
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2018-02-27
Filing date: 2019-02-11
Publication date: 2022-03-25
Anticipated expiration: 2039-02-11
Also published as: CN110195631A; JP2019148220A; JP6678691B2

Abstract

The present invention provides an exhaust gas purifying device, wherein when half bodies of a housing containing a honeycomb carrier are matched, a gasket is not extruded. An exhaust gas purification device (1) is provided with: a columnar honeycomb carrier (10); a gasket (30) that is wound around the outer peripheral surface (11) of the honeycomb carrier (10); and a case (20) that holds the honeycomb carrier (10) in a state in which the gasket (30) is compressed, wherein the case (20) is divided into two halves, namely, a half (female half 21) and a half (male half 22), in the radial direction of the honeycomb carrier (10), the half (female half 21) is fitted to the other half (male half 22) so as to be positioned outside the other half, and the gasket (30) is disposed such that a folding portion (33) in a state in which the gasket is wound around the outer peripheral surface (11) of the honeycomb carrier (10) is positioned near the center of the half (female half 21) in the circumferential direction.

Description

Exhaust gas purification device

Technical Field

The present invention relates to an exhaust gas purification apparatus.

Background

Conventionally, an exhaust gas purifying apparatus provided in an exhaust passage of an internal combustion engine has a structure in which a columnar honeycomb carrier is accommodated in a cylindrical case. The honeycomb carrier is held in the housing by a packing interposed in a compressed state between the outer peripheral surface thereof and the inner surface of the housing. Such a technique is proposed: when the honeycomb carrier is held by the cylindrical case via the packing, the degree of unevenness in surface pressure acting on the honeycomb carrier is alleviated (for example, see patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 9-112260

Disclosure of Invention

Problems to be solved by the invention

In the technique of patent document 1, a housing for housing a honeycomb carrier is configured by 2 half bodies fitted to both side edge portions in the central axis direction thereof, and the cross-sectional shape of the housing in the direction intersecting the central axis when the 2 half bodies are fitted is formed into an elliptical shape. Thus, when the 2 half bodies are fitted to each other, the tensile force applied to the gasket wound around the honeycomb carrier is reduced, and the variation in the surface pressure of the honeycomb carrier in the circumferential direction can be reduced, thereby improving the holding force of the honeycomb carrier.

However, in the technique of patent document 1, when 2 half bodies are fitted and fitted, the gasket wound around the honeycomb carrier is not completely uniformly contained in the case, and may be pushed out from the fitting portion.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an exhaust gas purifying device in which a gasket is not pushed out when half bodies of a housing accommodating a honeycomb carrier are mated.

Means for solving the problems

(1) An exhaust gas purification device (for example, an exhaust gas purification device 1 described later) includes: a columnar honeycomb carrier (for example, a honeycomb carrier 10 described later); a gasket (e.g., a gasket 30 described later) wound around an outer peripheral surface (e.g., an outer peripheral surface 11 described later) of the honeycomb carrier; and a case (for example, a case 20 described later) that holds the honeycomb carrier in a state in which the gasket is compressed, wherein the case is divided into two half bodies (for example, a female half body 21 described later) and another half body (for example, a male half body 22 described later) in a radial direction of the honeycomb carrier, the one half body is fitted so as to be positioned outside the other half body, and the gasket is disposed so that a folding portion (for example, a folding portion 33 described later) in a state in which the gasket is wound around an outer peripheral surface of the honeycomb carrier is positioned near a center of the one half body in a circumferential direction.

In the exhaust gas purifying device of the above (1), the folded portion of the mat wound around the outer peripheral surface of the honeycomb carrier is provided in the vicinity of the center of the one half body in the circumferential direction. Therefore, when a pressing force for matching one half body with the other half body is applied to the gasket through the other half body, the force acts in such a manner as to suppress extrusion of the gasket and narrow the interval of the folded portion. Therefore, when the half bodies of the case that houses the honeycomb carrier are mated, the gasket is not pushed out from the mating portions of the two half bodies. Therefore, as the exhaust gas purifying apparatus, the exhaust gas can be prevented from leaking. In addition, the necessary surface pressure for holding the honeycomb carrier is stably ensured.

(2) The exhaust gas purification device according to the above (1), wherein an outline (for example, an outline C described later) of a cross section of the housing intersecting a central axis (for example, a central axis X described later) of the honeycomb carrier has straight portions (for example,

straight portions

251 and 252 and

straight portions

253 and 254 described later).

In the exhaust gas purifying apparatus of the above (2), the pressing force when the two half bodies are mated is uniformly transmitted from the straight portion of the other half body to the gasket, and the transmitted force acts to suppress the extrusion of the gasket at the arc-shaped portion (R portion) connected to the end portion of the straight portion and to narrow the folded portion. Therefore, the gasket is reliably wound around the outer periphery of the honeycomb carrier. Therefore, the honeycomb carrier is stable and phase matching with the gasket becomes easy.

(3) The exhaust gas purification device according to the above (2), wherein the cross section of the housing has a rounded rectangular shape, and the straight portions are provided at short diameter portions (for example, short diameter portions SP1 and SP2 described later) corresponding to both ends in a short direction (for example, short direction S described later) of the rounded rectangular shape.

In the exhaust gas purifying device of the above (3), since the cross section is a rounded rectangle and the straight portions are provided at the portions (for example, short diameter portions SP1 and SP2 described later) corresponding to both ends in the short direction (for example, short direction S described later) of the rounded rectangle, the honeycomb carrier is more stable and the phase matching with the packing is easier.

(4) The exhaust gas purification device according to the above (2) or (3), wherein the cross section of the housing has a rounded rectangular shape, and the fitting portions of the one half body and the other half body (for example, the

fitting portions

211 and 212 of the female half body 21 and the

fitting portions

221 and 222 of the male half body 22 described later) are located in long diameter portions (for example, long diameter portions LP1 and LP2 described later) corresponding to both ends in a longitudinal direction (for example, a longitudinal direction L described later) of the rounded rectangular shape.

In the exhaust gas purifying device of the above (4), the cross section of the casing is rounded and rectangular, and the operation of compressing and fixing (canning) the honeycomb carrier in the casing via the gasket is easy, and the welding at the fitting portion is also easy. Therefore, productivity is excellent.

Effects of the invention

According to the present invention, it is possible to provide an exhaust gas purifying apparatus in which a gasket is not pushed out when half bodies of a case that houses a honeycomb carrier are mated, and a surface pressure necessary for holding the honeycomb carrier is stably ensured.

Drawings

Fig. 1 is an exploded perspective view of an exhaust gas purification device according to an embodiment of the present invention.

Fig. 2 is a perspective view showing a honeycomb carrier.

Fig. 3 is a sectional view of the honeycomb carrier in a direction intersecting the center axis.

Fig. 4 is a schematic sectional view of the honeycomb carrier in the direction of the center axis.

Fig. 5 is an exploded perspective view of the housing.

Fig. 6 is a sectional view of the housing in a direction intersecting the center axis.

Fig. 7 is a schematic diagram showing an assembly procedure of the exhaust gas purification apparatus of the present embodiment.

Fig. 8 is a schematic diagram showing an assembly procedure of an exhaust gas purification device of a comparative example.

Description of the reference symbols

1: an exhaust gas purification device;

10: a honeycomb carrier;

11: an outer peripheral surface;

20: a housing;

21: a female half body;

22: a male half;

30: a liner;

31. 32: an end portion;

33: a closure part;

201. 202: joggling;

211. 212, 221, 222: a fitting portion;

251. 252, 253, 254: a straight part.

Detailed Description

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is an exploded perspective view of an exhaust gas purifying device 1 of the present embodiment.

The exhaust gas purifying device 1 is an exhaust gas purifying Filter called DPF (Diesel Particulate Filter), which is provided in an exhaust passage of an unillustrated Diesel internal combustion engine and traps Particulate matter in exhaust gas flowing through the exhaust passage. The exhaust gas purification device 1 includes: a columnar honeycomb carrier 10; a gasket 30 wound around the outer peripheral surface 11 of the honeycomb carrier 10; and a case 20 that holds the honeycomb carrier 10 in a state of compressing the gasket 30.

The honeycomb carrier 10 is a through-wall type for trapping exhaust gas particulates, and is made of, for example, silicon carbide.

The honeycomb carrier 10 has a plurality of cells divided by partition walls in the exhaust gas flow direction, and one end face and the other end face of each cell are closed alternately with adjacent cells. In the honeycomb carrier 10, exhaust gas flows in from the cells in the columnar shape that are open to the upstream side in the exhaust gas flow direction, exhaust gas particles are trapped when the exhaust gas passes through the partition walls between adjacent cells, and the exhaust gas that has passed through the partition walls and has removed the exhaust gas particles flows out from the cells in the columnar shape that are open to the downstream side in the exhaust gas flow direction.

The honeycomb carrier 10 is formed in a columnar shape as a whole, and its central axis X can be assumed. A gasket 30 is wound around the outer peripheral surface 11 of the honeycomb carrier 10, and the case 20 holds the honeycomb carrier 10 in a state where the gasket 30 is compressed.

Fig. 2 is a perspective view of the honeycomb carrier 10.

The outline C1 of the cross section S1 of the columnar honeycomb carrier 10 intersecting the central axis X thereof has

straight portions

111, 112, 113, and 114 formed linearly at least at one place (four places in this example), and has

arc portions

121, 122, 123, and 124 at the other places. The

arcuate portions

121, 122, 123, 124 are formed with bulging

portions

131, 132, 133, 134 projecting in the outer diameter direction. On the other hand, the

straight portions

111, 112, 113, 114 are flat.

Fig. 3 is a cross-sectional view of a portion of the honeycomb carrier including the bulge portion in a direction intersecting the axis.

As shown in fig. 3, the contour C1 of the cross section S1 of the honeycomb carrier 10 has a rounded rectangular shape, and

straight portions

111, 112, 113, and 114 are formed in the long-diameter portions LD1 and LD2 corresponding to both ends of the longitudinal direction LD and the short-diameter portions SD1 and SD2 corresponding to both ends of the short-side direction SD, respectively. Vertical arrow lines LD and SD drawn downward in fig. 3 conceptually indicate the longitudinal direction and the lateral direction of the rounded rectangular shape.

Straight portions

111 and 112 are formed corresponding to the long diameter portions LD1 and LD2, respectively, and

straight portions

113 and 114 are formed corresponding to the short diameter portions SD1 and SD2, respectively. As a result, when a virtual diagonal line connecting the intersections of the extending lines of the

straight portions

111 and 112 and the

straight portions

113 and 114 is considered, the raised

portions

131, 132, 133 and 134 are located in pairs on the corresponding virtual diagonal line. By forming the plurality of straight portions in this manner, a large cross-sectional area of the honeycomb carrier 10 can be ensured, and the pressure loss of the exhaust gas can be reduced. Further, since the bulging

portions

131, 132, 133, 134 are located in pairs on the imaginary diagonal line, the surface pressure applied to the pad 30 at the arc-shaped

portions

121, 122, 123, 124 is effectively increased, and the management of the surface pressure is facilitated.

Fig. 4 is a schematic view of a cross section S2 of the honeycomb carrier 10 parallel to the central axis X. In particular, the cross section S2 is a cross section of a portion including the aforementioned bulge portions 131 and 133(132 and 134) and the center axis X. In other words, the cross section S2 is a cross section including the central axis X and the imaginary diagonal line.

As shown in fig. 4, in a cross section S2 parallel to the central axis X of the honeycomb carrier 10, the outline C2 is formed in a substantially square shape, and the upper and lower sides of the outline C2 correspond to the exhaust gas inflow side and the exhaust gas outflow side of the honeycomb carrier 10. The left and right sides of the contour C2 correspond to the outer peripheral surface 11 of the columnar honeycomb carrier 10. The bulging portions 131 and 133(132 and 134) protrude from the outer peripheral surface 11.

As shown in fig. 4, the bulge portions 131 and 133(132 and 134) are formed at intermediate positions from the end surface of the honeycomb carrier 10 on the exhaust gas inflow side to the end surface on the outflow side. In other words, both end surfaces of the expanded portions 131 and 133(132 and 134) are formed at positions on the center side of the exhaust gas inflow end surface and the exhaust gas outflow end surface of the honeycomb carrier 10 along the central axis X. Therefore, when a gasket not shown in fig. 4 is wound around the outer peripheral surface 11 of the honeycomb carrier 10, the entire surfaces of the bulging portions 131 and 133(132 and 134) including both end surfaces are covered with the gasket, and the honeycomb carrier is properly held in position in the case by the gasket.

Next, the structure of the case 20 will be described with reference to fig. 5 and 6.

Fig. 5 is an exploded perspective view of the housing 20, and fig. 6 is a sectional view of the housing 20 in a direction intersecting the center axis X (in this example, a vertical direction). In fig. 6, the honeycomb carrier 10 and the gasket 30 accommodated in the case 20 are not shown for easy understanding.

As shown in fig. 5, the housing 20 is divided into two in the radial direction of the honeycomb carrier 10, and the female half cell 21, which is one half cell, and the male half cell 22, which is the other half cell, are fitted so that the female half cell 21 is positioned outside the male half cell 22. As shown in fig. 6, the case 20 is formed in a tubular shape as a whole in a state where the female half cell 21 and the male half cell 22 are fitted to each other, and shares the center axis X with the honeycomb carrier 10.

As shown in fig. 6, the profile C of the section S of the casing 20 is in the form of a rounded rectangle: straight portions are formed at the long diameter portions LP1 and LP2 corresponding to both ends in the longitudinal direction L and at the short diameter portions SP1 and SP2 corresponding to both ends in the short direction S. Vertical arrow lines L and S drawn downward in fig. 5 conceptually represent the longitudinal direction and the lateral direction of the rounded rectangle.

Straight portions

251 and 252 are formed corresponding to the long diameter portions LP1 and LP2, respectively, and

straight portions

253 and 254 are formed corresponding to the short diameter portions SP1 and SP2, respectively.

The fitting portion between one half and the other half is located at a position corresponding to the long diameter portions LP1 and LP2, respectively. Specifically, the fitting portion 211 of the female half body 21 and the fitting portion 221 of the male half body 22 are present corresponding to the long diameter portion LP 1. Further, corresponding to the long diameter portion LP2, there are a fitting portion 212 of the female half body 21 and a fitting portion 222 of the male half body 22.

The engaging portion 211 of the female half body 21 is formed with an engaging button 201, and the engaging button 201 protrudes outward with a step corresponding to the thickness of the engaging portion 221 of the male half body 22. Similarly, the engaging portion 212 of the female half body 21 is formed with an engaging buckle 202, and the engaging buckle 202 projects outward with a step corresponding to the thickness of the engaging portion 222 of the male half body 22.

Returning to fig. 1, the spacer 30 is wound around the outer peripheral surface 11 of the honeycomb carrier 10 so as to cover the swelling

portions

131, 132, 133, and 134. That is, the gasket 30 circumferentially surrounds the

straight portions

111, 112, 113, and 114 and the

arc portions

121, 122, 123, and 124 of the honeycomb carrier 10, and surrounds the outer periphery of the honeycomb carrier 10 so as to cover the portions where the bulging

portions

131, 132, 133, and 134 are formed. The gasket 30 is made of ceramic fibers such as alumina fibers, silica fibers, alumina silicate fibers, and glass fibers having heat resistance, vibration resistance, sealing function, and vibration absorbing ability.

Next, the steps of assembling the exhaust gas purifying device 1 described above and the operation and effect thereof will be described with reference to fig. 1 to 6.

Fig. 7 is a schematic diagram showing an assembly procedure of the exhaust gas purification apparatus 1 of the present embodiment.

First, the spacer 30 is wound around the outer peripheral surface 11 of the honeycomb carrier 10, and the honeycomb carrier 10 with the spacer 30 wound thereon is accommodated in the female half body 21 placed on the table. At this time, as shown in fig. 7, the spacer 30 is disposed such that the folded portion 33 of the both

end portions

31, 32 in the state of being wound around the outer peripheral surface 11 of the honeycomb carrier 10 is positioned in the vicinity of the center in the circumferential direction of the female half-cell 21.

Next, the male half body 22 is brought into close contact with and pressed against the female half body 21 accommodating the honeycomb carrier 10 and the spacer 30 from above, and the male half body 22 is fitted into the female half body 21. Here, when the male half body 22 is fitted to the female half body 21, the honeycomb carrier 10 wrapped with the packing 30 is placed on the female half body 21 so that the folded portion 33 of the packing 30 is located near the center in the circumferential direction of the female half body 21, as described above. Thus, in a state where the honeycomb carrier 10 is placed on the female half body 21, the pressing force F is applied to the female half body 21 side so as to cover and compress the gasket 30 with respect to the male half body 22 in the open state as shown in fig. 1 and 5.

As shown in fig. 7, the folded portion 33 of the gasket 30 is positioned at the position described above, and the pressing force F acts as follows in conjunction with the inner peripheral surfaces of the female half body 21 and the male half body 22 being curved surfaces that are curved toward the inner peripheral surfaces toward the tip end sides of the peripheral edge portions. That is, the pressing force F acts on the gasket 30 as forces Wf1 and Wf2, and the forces Wf1 and Wf2 make the gasket 30 surround the outer peripheral surface 11 of the honeycomb carrier 10 to suppress the extrusion of the gasket 30 and narrow the folds 33

As can be understood from fig. 7, the pressing force F transmitted from the male half 22 acts as counterclockwise and clockwise component forces like the forces Wf1 and Wf2 in the arc-shaped portions connected to the ends of the

straight portions

253 and 254 in directions to suppress squeezing out of the gasket and to narrow the closed portions. Therefore, the operation of compressing and fixing (canning) the honeycomb carrier 10 in the case 20 through the spacer 30 is easy, and the welding at the fitting portion of the female half body 21 and the male half body 22 is also easy. Therefore, productivity is excellent.

When the female half body 21 and the male half body 22 of the case 20 for housing the honeycomb carrier 10 are mated, the gasket 30 is not pushed out from the mating portion of the two

half bodies

21 and 22. Therefore, the

fitting portions

221, 222 of the male half 22 are appropriately fitted to the

fitting portions

211, 212 of the female half 21 by the pressing force F. Further, the gasket 30 is not pushed out from the mating portions of the two

half bodies

21, 22, and therefore the surface pressure necessary for holding the honeycomb carrier 10 is stably ensured. In this case, the engaging

portions

221 and 222 of the male half 22 are accurately engaged with the engaging

buttons

201 and 202 of the engaging

portions

211 and 212 of the female half 21, and thus, a surface contact advantageous for maintaining airtightness is obtained without generating useless projections. Therefore, as the exhaust gas purification apparatus 1, the exhaust gas leakage can be effectively prevented. In fig. 7, a target portion including the joggle 201 is shown by a circle of a two-dot chain line, but the action like the target portion is also generated in a portion including the joggle 202.

Fig. 8 is a schematic diagram showing an assembly procedure of an exhaust gas purification device of a comparative example. Here, the exhaust gas purifying device of the comparative example is an exhaust gas purifying device in which the folded portion of the gasket is not provided in the vicinity of the center in the circumferential direction of the female half body, unlike the exhaust gas purifying device 1 of the present embodiment.

In the exhaust gas purifying apparatus of the comparative example shown in fig. 8, in a state where the honeycomb carrier 10 wound with the gasket 30 is placed on the male half cell 22a on the lower side in the drawing, the female half cell 21a is pressed toward the male half cell 22a by the pressing force F, and the female half cell 21a and the male half cell 22a are fitted to each other. In this way, the forces Wf3 and Wf4 acting on the gasket 30 by the pressing force F act to push the gasket 30 out of the matching portion between the end 221a of the male half 22a and the end 211a of the female half 21 a. Thus, the illustrated extrusion 35 is produced. In fig. 8, a region of interest including the extruded portion 35 is shown by a circle of a two-dot chain line. The above-described phenomenon in which the force for pushing out the gasket 30 acts is similarly generated in the matching portion between the end 222a of the male half 22a and the end 212a of the female half 21 a.

Therefore, in the exhaust gas purifying apparatus of the comparative example shown in fig. 8, it is difficult to appropriately wind the packing 30 around the honeycomb carrier 10 in the case 20, and there is a possibility that exhaust gas leaks from the matching portion between the female half body 21a and the male half body 22 a. In contrast, according to the exhaust gas purification apparatus 1 shown in fig. 1 to 7, the above-described problem in the case of fig. 8 does not occur.

According to the exhaust gas purification device 1 of the present embodiment, the following effects are exhibited.

(1) In the exhaust gas purifying device 1, the folded portion 33 of the mat 30 wound around the outer peripheral surface 11 of the honeycomb carrier 10 is provided in the vicinity of the center in the circumferential direction of the female half-body 21. Therefore, when the pressing force F for matching the female half body 21 and the male half body 22 is applied to the gasket 30 through the male half body 22, the pressing force F acts as the component forces Wf1 and Wf2 that suppress the squeezing out and narrow the gap of the closed part 33 (see fig. 4). Therefore, when the female half body 21 and the male half body 22 of the case 20 accommodating the honeycomb carrier 10 are mated, the gasket 30 is not pushed out from the mating portion of the two

half bodies

21, 22. Therefore, as the exhaust gas purification apparatus 1, the exhaust gas leakage can be prevented. Further, the gasket 30 is not pushed out from the mating portions of the two

half bodies

21, 22, and therefore the face pressure necessary for holding the honeycomb carrier 10 is stably ensured.

(2) In the exhaust gas purifying device 1, the pressing force F when the two

half bodies

21, 22 are matched is uniformly transmitted from the

straight portions

251, 252 of the male half body 22 to the gasket 30, and the transmitted force acts to suppress the extrusion of the gasket 30 at the arc-shaped portions connected to the end portions of the

straight portions

251, 252 and to narrow the folded portions 33 mutually. Therefore, the gasket 30 is reliably wound around the outer periphery of the honeycomb carrier 10. Therefore, the honeycomb carrier 10 is stable and phase matching with the gasket 30 becomes easy.

(3) In the exhaust gas purifying device 1, the cross section of the casing 20 is a rounded rectangle (see fig. 3), and the

straight portions

253 and 254 are provided at the short diameter portions SP1 and SP2 corresponding to both ends in the short side direction S of the rounded rectangle, so that the honeycomb carrier 10 is more stable and the phase matching with the packing 30 is easier.

(4) Since the cross section of the case 20 is a rounded rectangle (right side in fig. 3), and the

fitting portions

211, 212 of the female half body 21 and the

fitting portions

221, 222 of the male half body 22 are located at the long diameter portions LP1, LP2 corresponding to both ends in the longitudinal direction L of the rounded rectangle, the operation of compressing and fixing (canning) the honeycomb carrier 10 in the case 20 via the packing 30 is easy, and the welding of the fitting portion between the female half body 21 and the male half body 22 is also easy. Therefore, productivity is excellent.

In the exhaust gas purifying device described above, the cross section of the housing 20 is rounded and rectangular, and the

straight portions

251 and 252 and the

straight portions

253 and 254 are formed in the short diameter portions SP1 and SP2 corresponding to both ends in the short direction S and the long diameter portions LP1 and LP2 corresponding to both ends in the long direction L, but the present invention is not limited thereto, and the

straight portions

251 and 252 may be formed only in the short diameter portions SP1 and SP2 corresponding to both ends in the short direction S. In this case, the pressing force F when the two

half bodies

21 and 22 are matched is also uniformly transmitted from the

straight portions

251 and 252 of the male half body 22 to the gasket 30, and the transmitted force acts to suppress the extrusion of the gasket 30 at the arc-shaped portions connected to the ends of the

straight portions

251 and 252 and to narrow the folded portions 33 mutually. Therefore, the gasket 30 is reliably wound around the outer periphery of the honeycomb carrier 10, the honeycomb carrier 10 is stabilized, and phase matching with the gasket 30 is facilitated.

In the above-described embodiment, the exhaust gas purification device of the present invention is described by taking the DPF used for the diesel internal combustion engine as an example, but the present invention is not limited to this. The exhaust gas purifying apparatus of the present invention can also be applied to an exhaust gas purifying Filter called a GPF (Gasoline Particulate Filter) which is provided in an exhaust pipe of a Gasoline internal combustion engine and traps Particulate matter in exhaust gas flowing through the exhaust pipe.

Claims

1. An exhaust gas purification device provided with: a columnar honeycomb carrier; a gasket wound around an outer peripheral surface of the honeycomb carrier; and a case that holds the honeycomb carrier in a state where the gasket is compressed,

it is characterized in that the preparation method is characterized in that,

the housing is divided into two halves, one half and the other half, in a radial direction of the honeycomb carrier, and a female half as the one half is fitted to an outer side of a male half as the other half,

the gasket is disposed so that a folded portion in a state of being wound around the outer peripheral surface of the honeycomb carrier is located in the vicinity of the center of the female half body in the circumferential direction.

2. The exhaust gas purification apparatus according to claim 1,

the housing has a housing straight portion having a linear cross-sectional profile intersecting the center axis of the honeycomb carrier.

3. The exhaust gas purification apparatus according to claim 2,

the cross-sections of the housing and the honeycomb carrier are rounded rectangular shapes,

the straight portions of the case are formed in short diameter portions corresponding to both ends in the short side direction of the rounded rectangular shape,

the honeycomb carrier has straight portions of the honeycomb carrier formed at short diameter portions corresponding to both ends in the short side direction of the rounded rectangular shape,

the rounded rectangular shape of the honeycomb carrier includes an arc-shaped portion bent from an end of a straight portion of the honeycomb carrier,

the honeycomb carrier has a bulging portion that protrudes in an outer diameter direction from the arc-shaped portion,

the bulging portion is disposed at a substantially central position in an axial direction of the central axis,

the gasket is wound around the outer peripheral surface of the honeycomb carrier so as to cover the bulge portion.

4. The exhaust gas purification apparatus according to claim 2 or 3,

the cross section of the case is in a rounded rectangular shape, and the fitting portion between the female half body on one side and the male half body on the other side is located in a long diameter portion corresponding to both ends in the longitudinal direction of the rounded rectangular shape.