JP6838824B2 - Exhaust purification device - Google Patents

Description

The present invention relates to an exhaust gas purification device that mainly relates to an exhaust gas purification process generated in an internal combustion engine of a motorcycle or a motorcycle and removes harmful substances in the exhaust gas.

Conventionally, an exhaust purification device equipped with a DPF (diesel particulate filter) is installed in the exhaust path of an internal combustion engine to remove harmful substances contained in the exhaust to purify the exhaust. An example of this exhaust gas purification device is shown in FIG. The exhaust gas purification device 100 of FIG. 6 is composed of a honeycomb structure such as a DPF, a purifying body 110 that purifies the exhaust gas, and a mat-shaped holding material 120 that is provided around the outer periphery of the purifying body 110 to hold the purifying body. A case 130 for accommodating the purifying body 110 around which the holding material 120 is provided is provided.

The purifying body 110 has a substantially elliptical pillar shape, and a circumferential bulging portion 111 that bulges outward is provided at an intermediate position in the axial direction thereof. The bulging portion 111 is formed in a substantially octagonal shape in a cross-sectional view, and is located between the flat surface portions 112 located above and below, the flat surface portions 113 located on both the left and right sides, and the flat surface portion 112 and the flat surface portion 113. It is composed of a flat surface portion 114 to be formed. The holding material 120 is provided so as to cover the outer periphery of the bulging portion 111.

The case 130 is composed of an upper case half body 140 located on the upper side and a lower case half body 150 located on the lower side. The upper case half body 140 and the lower case half body 150 are formed in the same shape, and are also formed in a shape that imitates the upper half and the lower half of the purifying body 110, respectively. Flange 141 and 151 protruding outward are formed at both ends of the upper case half body 140 and the lower case half body 150, respectively, and correspond to the flat surface portion 113 at the portion corresponding to the bulging portion 111. Flange 141 and 151 project outward from the portion where the flange is formed.

By the way, in this exhaust gas purification device 100, the holding material 120 provided around the flat surfaces 113 and 113 located on both the left and right sides is loosened, and the holding material 120 and the flat surface portion 113 are not in close contact with each other. It may be enough. In such a case, when the upper case half body 140 and the lower case half body 150 are closed from above and below, the holding material 120 is bitten by the flanges 141 and 151 as shown in FIG. , The holding material 120 reduces the holding force of the purifying body 110, and the flanges 141 and 151 cause insufficient welding due to an unexpected clearance.

As an exhaust gas purification device that can solve the problem of sandwiching the holding material 120 to some extent, there is an exhaust gas purification device of Patent Document 1. In the exhaust purification device of Patent Document 1, the distance from the outer peripheral surface of the purifying body to the case differs depending on the part of the purifying body to partially provide a wide space between the purifying body and the case, and the base of the flange of the case half body. A large tapered portion or a composite rounded shape portion is provided on the surface to form a large gap, and the holding material is allowed to escape into this wide space or a large gap to prevent the holding material from being caught.

Japanese Unexamined Patent Publication No. 2015-110905

However, the exhaust gas purification device of Patent Document 1 has a structure in which the purifying body is held by a holding material in a narrow space only partially between the purifying body and the case, and the holding material is released to a wide space. If the adjustment between the narrow space and the wide space is not accurate, the holding power of the purifying body by the holding material becomes insufficient. Further, a large cavity in which the holding material is not filled is formed in the large gap at the base of the flange, and the exhaust gas that does not flow through the purifying body flows into this cavity, and there is a high possibility that the unpurified exhaust gas flows out to the outside air.

Therefore, it is possible to prevent the holding material from being caught between the case halves, to perform reliable welding between the case halves, and to hold the purifying body with sufficient holding force to ensure the purification of exhaust gas. There is a demand for an exhaust gas purification device that can be used in the above.

The present invention has been proposed in view of the above problems, and it is possible to prevent the holding material from being caught between the case halves, to perform reliable welding between the case halves, and to hold the purifying body with sufficient holding force. It is an object of the present invention to provide an exhaust gas purification device which can be held by the exhaust gas and can surely and stably purify the exhaust gas.

The exhaust purification device of the present invention accommodates a substantially pillar-shaped purifying body for purifying exhaust, a mat-shaped holding material around the outer periphery of the purifying body, and a purifying body around which the holding material is provided. A circumference having a case, wherein the case is composed of a pair of case halves aligned in a direction substantially perpendicular to the axial direction of the purifying body, and bulges outward at an intermediate position in the axial direction of the purifying body. A substantially flat flat portion or a curved portion formed on the outer periphery of the bulging portion of the purifying body is provided with a shaped bulging portion, and the bent portion extending in the axial direction is the bent portion of the purifying body. The holding material is provided on both sides of the bulging portion so as to cover the outer periphery of the bulging portion of the purifying body, and is pulled by the bent portion of the bulging portion to be pulled by the bent portion. It is provided so as to be thinner than the other parts, and each of the case halves is dented inward and bulges outward at an axially intermediate position corresponding to the position of the bulging portion of the purifying body. A substantially arc-shaped bulge is provided, and at least a part of the mating portions that are brought into contact with each other on both sides of the pair of case halves substantially corresponds to the respective bulges of the pair of case halves. It is characterized in that the purifying body is provided at a position in the vicinity of the bent portion of the bulged portion so as to imitate the bent portion.
According to this, the portion of the holding material located on the outside of the bent portion is pulled so as to be urged outward at the bent portion, is thinner than the other portions, and is in close contact with the purifying body. Therefore, it is possible to prevent the portion of the mating portion provided so as to imitate the bent portion in the vicinity of the bent portion from biting the holding material when the case halves are aligned with each other. Therefore, in an exhaust purification device having a substantially flat flat portion or a curved surface portion and a bent portion on the outer periphery of the purifying body, when welding the case halves together, the case is not caught by the holding material. The halves can be reliably welded to each other. In addition, there is no biting of the holding material, the case halves can be joined to each other as set, and the purified body can be held with the holding material of the set amount and density, and the purified body is stable with sufficient holding power. Can be held. In addition, in the state where the case halves are aligned with each other and the case in which the purifying body with the holding material is housed is not generated, a large cavity such as a large gap at the base of the flange extending in the axial direction of the purifying body does not occur. , Exhaust gas purification can be performed reliably and stably. In addition, in an exhaust purification device in which the purifying body is provided with a circumferential bulging portion that bulges outward, it is possible to prevent the holding material from being caught between the case halves, and to ensure welding between the case halves and to purify the purifying body. It is possible to hold the exhaust gas with a sufficient holding force, and it is possible to reliably and stably purify the exhaust gas.

Exhaust purification system of the present invention, the mating portion is Ri abutment der the root abuts mutual flange projecting laterally outward of the pair of case halves, the contact portion, the pair of case It is characterized in that it is provided so as to imitate the bent portion at a position substantially corresponding to each of the bulged portions of the half body and at a position near the bent portion of the bulging portion of the purifying body.
According to this, in the exhaust purification device that aligns the flanges protruding outward of the pair of case halves with each other, it is possible to prevent the holding material from being caught between the case halves, and to reliably weld and purify the case halves. It is possible to hold the body with sufficient holding power, and it is possible to reliably and stably purify the exhaust gas.

Exhaust purification system of the present invention, the mating portion is Ri contact portion der between the casing halves of the tip and the one of one of the case halves other of the case halves to be fitted to the inside of the contact The portion is provided so as to imitate the bent portion at a position substantially corresponding to the bulged portion of each of the pair of case halves and at a position near the bent portion of the bulging portion of the purifying body. It is characterized by that.
According to this, in the exhaust purification device in which the tip of the other case half body, which is fitted inside one case half body, comes into contact with the one case half body, the holding material is prevented from being bitten by the case half bodies. However, it is possible to reliably weld the case halves to each other, hold the purifying body with sufficient holding force, and reliably and stably purify the exhaust gas.

The exhaust purification device of the present invention comprises the purifying body at an arbitrary position in the axial direction of the purifying body and the bulging of the pair of case halves of the case in the peripheral region of the holding material of the purifying body. The distance from the portion is substantially the same in the entire circumferential direction other than the periphery of the mating portion.
According to this, the purifying body can be held with a substantially equal holding force over the entire circumference by the holding material, and the purifying body can be held more stably. Further, since the structure is not formed by intentionally adjusting the portion where the holding material is compressed and the portion where the holding material is released in the circumferential direction, the allowable range of design error becomes large. Therefore, it is possible to improve the yield, reduce the manufacturing cost, and improve the manufacturing efficiency.

According to the exhaust gas purification device of the present invention, it is possible to prevent the holding material from being caught by the case halves constituting the case, to perform reliable welding between the case halves, and to hold the purifying body with sufficient holding force. It can be held at, and the exhaust gas can be purified reliably and stably.

(A) is a perspective view of the exhaust gas purification device of the first embodiment according to the present invention, and (b) is a side view thereof. A cross-sectional view taken along the line AA of the exhaust gas purification device of the first embodiment. The perspective view of the purifying body in the exhaust gas purification apparatus of 1st Embodiment. (A) is a side view showing a first modification of the exhaust gas purification device of the first embodiment, and (b) is a side view showing a second modification of the exhaust gas purification device of the first embodiment. (A) is a perspective view of the exhaust gas purification device of the second embodiment according to the present invention, and (b) is a sectional view taken along the line BB. (A) is a perspective view of an exhaust gas purification device of a conventional example, and (b) is a cross-sectional view taken along the line MM. The cross-sectional explanatory view explaining the biting of the holding material in the exhaust gas purification apparatus of the conventional example.

[Exhaust gas purification device of the first embodiment]
As shown in FIGS. 1 and 2, the exhaust purification device 1 of the first embodiment according to the present invention has a substantially pillar-shaped purifying body 2 for purifying exhaust and a mat-shaped purifying body 2 provided around the outer periphery of the purifying body 2. A pair of holding material 3 and a case 4 for accommodating the purifying body 2 around which the holding material 3 is provided are provided, and the case 4 is aligned in a direction substantially perpendicular to the axial direction of the purifying body 2. It is composed of case halves 5 and 6.

As shown in FIGS. 1 to 3, the purifying body 2 in the first embodiment has a substantially elliptical columnar shape, and a circumferential bulging portion 21 that bulges outward at an intermediate position in the axial direction thereof. It is provided. Before and after the bulging portion 21, base portions 22 and 23 having a diameter smaller than that of the bulging portion 21 and having a substantially elliptical column shape are provided. The outer shape of the bulging portion 21 is substantially octagonal when viewed from the front, and on the outer periphery thereof, the flat portions 211 and 211 located on the top and bottom, the flat portions 212 and 212 located on both the left and right sides, and the flat portions 211 and the flat portions. A flat surface portion 213 provided between the surface and the 212 is formed.

A bent portion 214 is formed between the flat portion 211 and the flat portion 213 so as to bend the end of the flat portion 211, and the bent portion 214 extends in the axial direction of the purifying body 2 to form the flat portion 211. It is provided so as to form an end side. Further, a bent portion 215 is formed between the flat surface portion 212 and the flat surface portion 213 so as to bend the end of the flat surface portion 212, and the bent portion 215 extends in the axial direction of the purifying body 2 and is a flat surface portion. It is provided so as to form an end edge of 212.

That is, the bulging portion 21 of the purifying body 2 is provided with four bent portions 214 and four bent portions 215, and the bent portions 215 and 215 located on the upper side are provided on both sides of the purifying body 2. At the same time, bent portions 215 and 215 located on the lower side are also provided on both sides of the purifying body 2. The outer shape of the purifying body 2 is formed by carving out the outer skin, for example, leaving only a specific part of the purifying base material that is the base of the purifying body 2.

The purifying body 2 in the first embodiment has a honeycomb body in which a plurality of cells serving as an exhaust gas flow path are partitioned by a porous wall, and DPF (Diesel) that collects and burns the catalyst on the porous wall. Although it is a wall flow type purification filter structure such as Particulate Filter), an appropriate one for purifying exhaust gas can be used for the purification body 2, for example, as a partition wall of a honeycomb body (catalyst carrier) made of ceramics. It can also be used as a straight-flow type purification filter structure in which a catalyst-supporting layer such as alumina and a catalyst metal such as Pt supported by the catalyst-supporting layer are provided, or a purification filter structure in which a wall-flow type and a straight-flow type are integrated. Good.

The holding material 3 is provided so as to cover the outer periphery of the bulging portion 21 of the purifying body 2. In the first embodiment, the holding material 3 is located in a region corresponding to the bulging portion 21 in the axial direction of the purifying body 2. Is installed around. As the holding material 3, an appropriate material can be used in a strip shape within the scope of the purpose of the present invention, and for example, it can be a heat-resistant material such as alumina fiber, mullite fiber, or a mixed fiber thereof. is there.

The pair of case halves 5 and 6 constituting the case 4 are each made of metal, and substantially arc-shaped bulging portions 51 and 61 that bulge outward are provided at intermediate positions in the axial direction. Bases 52 and 53 having a diameter smaller than that of the bulge 51 and a substantially semi-elliptical cylinder are provided before and after the bulge portion 51, and a substantially semi-elliptical cylinder having a diameter smaller than that of the bulge portion 61 also before and after the bulge portion 61. The bases 62, 63 of the shape are provided.

Flange 54/54 is formed at the left and right side ends of the case half body 5, which corresponds to the upper case half body in the drawing, by being bent so as to project outward. The flange 54 is formed so as to extend substantially linearly at the front portion and the rear portion, and is formed so as to be bent upward in a substantially linear shape at a position substantially corresponding to the bulging portion 51, and extends substantially linearly at the center thereof. The root of the intermediate portion 541 formed in the above is arranged at a position near the bent portion 215 of the purifying body 2 and is provided so as to imitate the bent portion 215.

Flange 64/64 is formed at the left and right side ends of the case half body 6, which corresponds to the lower case half body in the drawing, by being bent so as to project outward. The flange 64 is formed so as to extend substantially linearly at the front portion and the rear portion, and is formed by being bent upward in a substantially linear shape at a position substantially corresponding to the bulging portion 61, and is formed substantially linearly at the center thereof. The root of the extending intermediate portion 641 is arranged at a position near the bent portion 215 of the purifying body 2 and is provided so as to imitate the bent portion 215.

The case 4 is formed by fitting the flange 54 of the case half body 5 and the flange 64 of the case 6 so that substantially the entire surface is in contact with each other, and is intermediate between the flange 54 and the flange 64 in the tip end portion or the outward protrusion direction. It is joined by welding in the axial direction at a predetermined position or the like. Of the portions where the flange 54 and the flange 64 are fitted so that substantially the entire surface is in contact with each other, the abutting portion 41 in which the roots of the flanges 54 and 64 are in contact with each other is a mating portion on both sides of the case halves 5 and 6. Corresponds to.

Then, among the contact portions 41, the contact portion 41p at which the root of the intermediate portion 541 of the flange 54 and the root of the intermediate portion 641 of the flange 64 are in contact with each other is arranged at a position near the bent portion 215 of the purifying body 2. , Is provided so as to imitate the bent portion 215. The contact portion 41p corresponds to a part of the mating portions of the case halves 5 and 6 which are arranged near the bent portion 215 and are provided so as to imitate the bent portion 215, and both sides of the case halves 5 and 6. The contact portions 41p and 41p are arranged at positions in the vicinity of the bent portion 215 and are provided so as to imitate the bent portion 215. Further, in the first embodiment, in the peripheral region of the holding material 3 of the purifying body 2, the separation distance between the purifying body 2 and the case 4 at an arbitrary position in the axial direction of the purifying body 2 is the circumference other than the periphery of the mating portion. It is formed so as to be substantially the same in the entire direction, in other words, in the entire circumferential direction other than the periphery of the contact portion 41p.

The flanges of the pair of case halves 5 and 6, the mating portion of the case 4, and the abutting portion are not limited to the above configuration. The roots of the flanges 54a and 64a and the roots of the intermediate portions 541a and 641a formed in a substantially linear shape at the center thereof are arranged in the vicinity of the contact portion 41 and the bent portion 215 to form a chevron shape. The contact portion 41p provided so as to imitate the 215, or the mating portion may be formed.

Further, as shown in FIG. 4B, flanges 54b and 64b extending substantially linearly over the entire length are formed at positions substantially corresponding to the bent portion 215, and the roots of the flanges 54b and 64b and the intermediate portion thereof are formed. The root may form a contact portion 41p or a mating portion which is arranged near the contact portion 41 and the bending portion 215 and is provided so as to imitate the bending portion 215.

According to the exhaust gas purification device 1 of the first embodiment, the portion of the holding material 3 located outside the bent portion 215 is pulled so as to be urged outward by the bent portion 215, and is thinner than the other portions. It will be in close contact with the purifier 2. Therefore, it is possible to prevent the mating portion or the contact portion 41p provided so as to imitate the bent portion 215 at a position near the bent portion 215 from biting the holding material 3 when the case halves 5 and 6 are mated with each other. can do. Therefore, in the exhaust gas purification device 1 having a flat surface portion 212 or the like on the outer periphery of the purification body 2, when welding the case halves 5 and 6 in a state of being combined with each other, the case halves are not bitten by the holding material 3. 5 and 6 can be reliably welded to each other. In addition, there is no biting of the holding material 3, and the case halves 5 and 6 can be joined to each other as set, and the purifying body 2 can be held by the holding material 3 having the amount and density as set. Can be stably held with sufficient holding power. Further, in the state where the case halves 5 and 6 are put together, and in the state of the case 4 containing the purifying body 2 around which the holding material 3 is provided, the bases of the flanges 54 and 64 extending in the axial direction of the purifying body 2 are large. Since large cavities such as gaps do not occur, exhaust gas can be purified reliably and stably.

Further, in the peripheral region of the holding material 3 of the purifying body 2, the separation distance between the purifying body 2 and the case 4 at an arbitrary position in the axial direction of the purifying body 2 is set to the circumference other than the periphery of the mating portion or the periphery of the contact portion 41p. By making the purifying body substantially the same in the entire direction, the purifying body 2 can be held by the holding material 3 with substantially equal holding force over the entire circumference, and the purifying body 2 can be held more stably. .. Further, since the structure is not formed by intentionally adjusting the portion where the holding material 3 is compressed and the portion where the holding material 3 is released in the circumferential direction, the allowable range of design error becomes large. Therefore, it is possible to improve the yield, reduce the manufacturing cost, and improve the manufacturing efficiency.

[Exhaust gas purification device of the second embodiment]
As shown in FIG. 5, the exhaust purification device 1k of the second embodiment according to the present invention has a substantially pillar-shaped purifying body 2 for purifying exhaust and a mat-shaped holding material 3 provided around the outer periphery of the purifying body 2. And a case 4k for accommodating the purifying body 2 around which the holding material 3 is provided, and the case 4k is a pair of case halves aligned in a direction substantially perpendicular to the axial direction of the purifying body 2. It is composed of 5k and 6k. The configuration of the purifying body 2, the configuration of the holding material 3, and the configuration in which the holding material 3 is provided so as to cover the outer periphery of the bulging portion 21 of the purifying body 2 are the same as those in the first embodiment.

The pair of case halves 5k and 6k constituting the case 4k are made of metal, respectively, and substantially arc-shaped bulging portions 51k and 61k that bulge outward are provided at intermediate positions in the axial direction. Bases 52k and 53k having a diameter smaller than that of the bulge 51k and substantially semi-elliptical cylinders are provided before and after the bulge portion 51k, and a substantially semi-elliptical cylinder having a diameter smaller than that of the bulge portion 61k before and after the bulge portion 61k. The bases of the shapes 62k and 63k are provided. The circumferences of the bases 52k and 53k of the case half 5k corresponding to the upper case half in the figure are shorter than the circumferences of the bases 62k and 63k of the case half 6k corresponding to the lower case half in the figure. There is.

At the left and right side ends of the case half body 5k corresponding to the upper case half body, the fitting receiving portion 55k is formed so as to bulge outward, and the contact ends before and after the fitting receiving portion 55k. A portion 56k is provided. The fitting receiving portion 55k is formed from the middle of the front base portion 52k to the middle of the rear side base portion 53k through the bulging portion 51k. The fitting receiving portion 55k extends at a position substantially corresponding to the bent portion 215 of the purifying body 2.

At the left and right side ends of the case half body 6k corresponding to the lower case half body, a fitting portion 65k to be fitted following the fitting receiving portion 55k is formed so as to extend in the axial direction. Contact end portions 66k are provided before and after the fitting portion 65k. The fitting portion 65k is formed from the middle of the front base portion 62k through the bulging portion 61k to the middle of the rear side base portion 63k. The fitting portion 65k extends at a position substantially corresponding to the bent portion 215 of the purifying body 2.

In the case 4k, the fitting portion 65k of the case half body 6k is fitted to the fitting receiving portion 55k of the case half body 5k, and the contact end portions 56k and 66k are brought into contact with each other. The tip, the outer peripheral surface of the case half body 6k, and the contact ends 56k and 66k are joined by welding each other. The contact portion between the tip of the case half body 6k and the case half body 5k fitted inside the case half body 5k, in other words, the contact portion 42k between the tip of the fitting portion 65k and the case half body 5k is the case half body 5k. Corresponds to the mating parts on both sides of 6k.

Then, among the contact portions 42k, the contact portion 42p arranged at a position near the bent portion 215 of the purifying body 2 is provided so as to imitate the bent portion 215. The contact portion 42p corresponds to a part of the mating portion of the case halves 5k and 6k which is arranged near the bending portion 215 and is provided so as to imitate the bending portion 215, and is provided on both sides of the case halves 5k and 6k. The contact portions 42p and 42p are arranged at positions in the vicinity of the bent portion 215, and are provided so as to imitate the bent portion 215, respectively. Also in the second embodiment, in the peripheral region of the holding material 3 of the purifying body 2, the separation distance between the purifying body 2 and the case 4 at an arbitrary position in the axial direction of the purifying body 2 is the circumference other than the periphery of the mating portion. It is formed so as to be substantially the same in the entire direction, in other words, in the entire circumferential direction other than the periphery of the contact portion 42p.

According to the second embodiment, in the exhaust gas purification device 1k in which the tip of the case half body 6k fitted inside the case half body 5k and the case half body 5k come into contact with each other, the effect corresponding to the configuration corresponding to the first embodiment. Can be obtained.

[Scope of inclusion of the invention disclosed herein]
The invention disclosed in the present specification is specified by changing the partial contents thereof to other contents disclosed in the present specification to the extent applicable, in addition to the inventions listed as inventions and the embodiments. Or, those specified by adding other contents disclosed in the present specification to these contents, or those specified by deleting these partial contents to the extent that a partial effect can be obtained and making them into a higher concept. Including. The invention disclosed in the present specification also includes the following modifications and additional contents.

For example, in the first and second embodiments, the bulging portion 21 of the purifying body 2 is provided with a flat surface portion 212, a bent portion 215, and the like, in other words, the flat surface portion and the bent portion are bent only in a part in the axial direction of the purifying body 2. Although the exhaust purifying device of the present invention has a structure in which a portion is provided, a flat portion or a bent portion is provided over the entire length of the purifying body in the axial direction, for example, when the purifying body has a substantially polygonal prism shape over the entire length. It also includes a configuration in which the mating portions on both sides of the pair of case halves are provided so as to imitate the bent portion at a position near the bent portion over the entire length. In this case, a structure in which a holding material is provided over the entire length corresponding to the flat portion or the bent portion over the entire length in the axial direction of the purifying body, or a part of the flat portion or the bent portion over the entire length in the axial direction of the purifying body. It is possible to provide a holding material with a corresponding axial length.

Further, if the holding material 3 in the first and second embodiments has a configuration in which the holding material 3 is provided around the region corresponding to the bulging portion 21 in the axial direction of the purifying body 2, the purifying body 2 is provided. It is preferable that the required holding force for holding can be surely obtained, but it is also possible to provide the purifying body 2 so as to be circulated only in the region corresponding to the bent portion 215 in the axial direction.

Further, if the width of the holding material (length in the axial direction of the purified body) in the present invention is a width equal to or less than the length of the purified body and a width of 30% or more of the length of the purified body, it is necessary to hold the purified body. It is suitable because the holding power can be obtained, and further, when the purified body has a bulging portion as in the first and second embodiments, the width is equal to or less than the length of the purified body and the length of the purified body is 30. It is more preferable to have a width of% or more and a width that allows the holding material to be provided around the front and back of the region corresponding to the bulging portion, because the required holding force for holding the purified body can be obtained more reliably. Is.

Further, the flat surface portion of the purifying body in the present invention includes a substantially flat flat surface portion, and also includes a shape close to a flat surface. Further, the exhaust gas purification device of the present invention is also applied to the case where the end of the curved surface portion formed on the outer periphery of the purification body is bent and the bending portions extending in the axial direction are provided on both sides of the purification body. .. The curved surface portion includes, for example, a curved surface portion having a convex shape on the outside and a curvature larger than that of the bent portion, and a curved surface portion having a curved surface shape having a convex shape on the inside.

The present invention can be used, for example, as an exhaust purification device installed in an exhaust path of an internal combustion engine of an automobile.

1, 1k ... Exhaust purification device 2 ... Purifier 21 ... Swelling part 211, 212, 213 ... Flat part 214, 215 ... Bending part 22, 23 ... Base 3 ... Holding material 4, 4k ... Case 41, 41p ... Contact Parts 42k, 42p ... Contact parts 5, 6, 5k, 6k ... Case half body 51, 61, 51k, 61k ... Swelling parts 52, 53, 62, 63, 52k, 53k, 62k, 63k ... Base 54, 64, 54a, 64a, 54b, 64b ... Flange 541, 641, 541a, 641a ... Intermediate part, 55k ... Fitting receiving part 65k ... Fitting part 56k, 66k ... Contact end 100 ... Exhaust purification device 110 ... Purifier 111 ... Bulging parts 112, 113, 114 ... Flat parts 120 ... Holding material 130 ... Case 140 ... Upper case half body 141 ... Flange 150 ... Lower case half body 151 ... Flange

Claims (4)

A pillar-shaped purifier that purifies the exhaust,
A mat-shaped holding material provided around the outer periphery of the purifying body and
The holding material is provided with a case for accommodating the purifying body.
The case is composed of a pair of case halves aligned in a direction substantially perpendicular to the axial direction of the purifying body.
A circumferential bulging portion that bulges outward is provided at an intermediate position in the axial direction of the purifying body.
Bent portions formed on the outer periphery of the bulging portion of the purifying body by bending the ends of a substantially flat flat portion or a curved surface portion extending in the axial direction are provided on both sides of the bulging portion of the purifying body. ,
The holding material is provided around the purifying body so as to cover the outer periphery of the bulging portion, and is pulled by the bent portion of the bulging portion so as to be thinner than the other portion at the bent portion. Be,
Each of the case halves is provided with a substantially arc-shaped bulging portion that dents inward and bulges outward at an axially intermediate position corresponding to the position of the bulging portion of the purifying body.
The bulge of the purifying body at a position where at least a part of the mating portions that are brought into contact with each other on both sides of the pair of case halves substantially correspond to the bulge of each of the pair of case halves. be in vicinity of the bent portion of the part are each provided so as to follow the bent portion the exhaust purification apparatus according to claim. The mating portion, Ri abutment der the root of flange projecting laterally outward of the pair of case halves abut each other,
The contact portion is provided so as to imitate the bent portion at a position substantially corresponding to each of the bulged portions of the pair of case halves and at a position near the bent portion of the bulging portion of the purifying body. The exhaust gas purification device according to claim 1, wherein the exhaust gas purification device is provided. The mating portion, Ri contact portion der between the casing halves of the tip and the one of one of the case halves other of the case halves to be fitted on the inside of,
The contact portion is provided so as to imitate the bent portion at a position substantially corresponding to each of the bulged portions of the pair of case halves and at a position near the bent portion of the bulging portion of the purifying body. The exhaust gas purification device according to claim 1, wherein the exhaust gas purification device is characterized by the above. In the peripheral region of the holding material of the purifying body, the distance between the purifying body at an arbitrary position in the axial direction of the purifying body and the bulging portion of the pair of case halves of the case is the distance between the purifying body. The exhaust purification device according to any one of claims 1 to 3 , wherein the entire circumferential direction other than the periphery of the mating portion is substantially the same.

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