JP2021110295A - Exhaust emission control device and manufacturing method of exhaust emission control device - Google Patents

Abstract

To provide an exhaust emission control device and a manufacturing method of the exhaust emission control device having a cartridge structure which can be easily manufactured and can reliably provide airtightness, and to provide a manufacturing method of the exhaust emission control device.SOLUTION: An exhaust emission control device includes an exhaust emission control unit, an inner tube which contains the exhaust emission control unit, an outer tube which includes the inner tube and an annular sealing member which seals between the inner tube and the outer tube. Therein, the inner tube includes an inner tube protrusion part which protrudes toward the outer side over the whole circumference, the outer tube includes an outer tube protrusion part which protrudes toward the inner side over the whole circumference, a sealing member is sandwiched, pressed and held between an inner tube protrusion part and an outer tube protrusion part. Therein, the outer tube is constituted by at least two separate tubular members which are arranged adjacently in a flow direction of exhaust and are joined air-tightly, the above-described outer protrusion part is provided on an end part of the joining portion side of either one side or both sides and an inner tube is inserted and fixed on an inner part of the outer tube so that the sealing member is sandwiched and held between the outer tube protrusion part and the inner tube protrusion part.SELECTED DRAWING: Figure 18

Description

The present invention relates to an exhaust gas purification device and a method for manufacturing an exhaust gas purification device. More specifically, the present invention relates to an exhaust gas purification device having a cartridge structure that can be easily manufactured and that can surely achieve airtightness, and a method for manufacturing the exhaust gas purification device.

Exhaust gas discharged from an internal combustion engine such as a diesel engine includes particulate matter (PM) composed of, for example, soot. Therefore, from the viewpoint of protecting the global environment, for example, an exhaust purification device such as a diesel particulate filter (DPF) that collects PM is interposed in the exhaust flow path of the internal combustion engine to remove PM. Purification of exhaust gas is widely practiced.

The PM collected in the DPF can be burned and removed by heating the DPF. However, when the DPF is used for a long period of time, nonflammable substances derived from engine oil and / or fuel additives (hereinafter, may be referred to as "ash") are deposited in the DPF. When the ash is deposited in the DPF in this way, it may lead to problems such as an increase in the pressure loss of the DPF and / or inhibition of PM oxidation by the catalyst carried on the DPF.

As a measure for reducing the above problems, for example, it is conceivable to replace the DPF itself regularly. Therefore, in the technical field, an outer cylinder is arranged in the housing of the exhaust purification device, and the inner cylinder containing the DPF inside can be detachably inserted into the inside of the outer cylinder. It is known that the adoption of the cartridge method facilitates the DPF replacement work.

When a double pipe structure such as the above cartridge method is adopted, in order to ensure that the exhaust gas passes through the DPF, the space between the inner cylinder and the outer cylinder is sealed so that the exhaust gas is between the inner cylinder and the outer cylinder. It is necessary to prevent the DPF from bypassing the DPF. However, in the exhaust purification device adopting the cartridge method, the inner cylinder containing the DPF inside is inserted from one end of the outer cylinder toward the other end, and the flanges provided at one end of the inner cylinder and the outer cylinder are provided. The inner cylinder is generally fixed to the outer cylinder by using a fixing member such as a bolt. When the inner cylinder is assembled to the outer cylinder only at one end of the inner cylinder and the outer cylinder in this way, the position of the inner cylinder inside the outer cylinder on the other end side of the outer cylinder is expected due to, for example, an assembly error. There is a risk that it will deviate from the position of. In order to reduce such deviation, it is necessary to strictly control the dimensional accuracy of the inner cylinder and the outer cylinder, which may lead to an increase in manufacturing cost as a result.

Therefore, in the art, as shown in FIGS. 22 and 23, the diameter is reduced toward the insertion direction of the inner cylinder 1 on the inner peripheral surface of the outer cylinder 2 facing the outer periphery of the inner end portion of the inner cylinder 1. A tapered guide ring 3 is provided, and a flange-shaped stopper ring 4 is provided at a position on the front side by a predetermined length from the back end of the outer peripheral surface of the inner cylinder 1, and between the guide ring 3 and the stopper ring 4. There is known an exhaust purification device 6 that seals between the inner cylinder 1 and the outer cylinder 2 by holding a cushion material (gasket) 5 (see, for example, Patent Document 1). Note that FIG. 23 is an enlarged view of a portion surrounded by a thick broken line in FIG. 22.

However, in the above structure, it is necessary to fix the guide ring inside the outer cylinder. For example, when trying to fix the guide ring inside the outer cylinder by MIG welding, as shown in FIG. 24, the tip of the welding torch 7 is inserted to a position where the guide ring 3 is fixed on the inner peripheral surface of the outer cylinder 2. It is necessary to make a round along the guide ring 3. However, for example, when the inner diameter of the outer cylinder 2 is small and / or when the position where the guide ring 3 is fixed on the inner peripheral surface of the outer cylinder 2 is deep, the welding torch 7 reaches the position where the guide ring 3 is fixed. And / or it may be difficult to handle the welding torch 7 inside the outer cylinder 2.

Further, when the guide ring is to be fixed to the inside of the outer cylinder by spot welding, as shown in FIG. 25, the outer cylinder 2 and the guide ring 3 are sandwiched by the pair of electrodes 8 and 9, and these electrodes 8 and 9 are sandwiched. It is necessary to apply an electric current between the two to perform welding. However, even in this case, for example, when the inner diameter of the outer cylinder 2 is small and / or when the position where the guide ring 3 is fixed on the inner peripheral surface of the outer cylinder 2 is deep, the guide ring 3 is fixed to the position. Reaching the electrode 8 and / or handling the electrode 8 inside the outer cylinder 2 may be difficult. Further, when the position where the guide ring 3 is fixed on the inner peripheral surface of the outer cylinder 2 is deep, the electrode 8 may reach the position where the guide ring 3 is fixed depending on the rigidity of the member supporting the electrodes 8 and 9. However, it may be difficult to press the electrodes 8 and 9 with sufficient pressure, and it may be difficult to achieve sufficient welding quality.

Japanese Patent No. 3881881

As described above, in the art, there is a demand for an exhaust gas purification device having a cartridge structure that can be easily manufactured and that can surely achieve airtightness, and a method for manufacturing the exhaust gas purification device. There is.

In view of the above problems, the exhaust gas purification device according to the present invention (hereinafter, may be referred to as "the device of the present invention") includes an exhaust gas purification unit, an inner cylinder, an outer cylinder, and a sealing member. It is an exhaust purification device equipped. The exhaust purification unit purifies the exhaust gas discharged from the internal combustion engine. The inner cylinder is a tubular member that includes an exhaust gas purification unit. The outer cylinder is a tubular member that includes the inner cylinder. The sealing member is a member having an annular shape and being held by sandwiching pressure between the inner cylinder and the outer cylinder to seal between the inner cylinder and the outer cylinder.

The outer cylinder includes an outer cylinder protruding portion which is a portion configured to project from the inner peripheral surface of the outer cylinder inward in the radial direction over the entire circumference at a predetermined position. On the other hand, the inner cylinder is configured to project from the outer peripheral surface of the inner cylinder toward the outside in the radial direction over the entire circumference at a position separated from the outer cylinder protrusion in the exhaust flow direction by a predetermined distance. It is provided with an inner cylinder protruding portion, which is a portion of the pipe. Further, the sealing member is held by sandwiching pressure between the inner cylinder protruding portion and the outer cylinder protruding portion.

In the apparatus of the present invention, the outer cylinder is composed of at least a first outer cylinder member and a second outer cylinder member. The first outer cylinder member and the second outer cylinder member are two separate tubular members that are adjacent to each other in the exhaust flow direction and are airtightly joined at a predetermined joint location. Further, either one or both of the first outer cylinder member and the second outer cylinder member is provided with the outer cylinder protrusion at the end closer to the joint portion.

In addition, the method for manufacturing the exhaust gas purification device according to the present invention (hereinafter, may be referred to as the "method of the present invention") is the above-mentioned manufacturing method for the device of the present invention, and the first outer cylinder member and the method. The outer cylinder is assembled by airtightly joining the second outer cylinder member at the joint portion, and the inner cylinder containing the exhaust purification unit is attached from one end of the outer cylinder, that is, from the end of the first outer cylinder. It is a method of manufacturing an exhaust gas purification device, which comprises inserting into the inside of an outer cylinder and holding a sealing member by sandwiching the sealing member between the protruding portion of the outer cylinder and the protruding portion of the inner cylinder.

As described above, in the apparatus of the present invention, the outer cylinder is composed of at least two separate members that are adjacent in the exhaust flow direction and airtightly joined at a predetermined joint location. An outer cylinder protruding portion that protrudes inward over the entire circumference is provided at the end portion of either one or both of these two members on the joint portion side. Therefore, the outside (corresponding to the guide ring) is deep inside the inner peripheral surface like the outer cylinder provided in the exhaust gas purification device (hereinafter, may be referred to as "conventional device") according to the prior art as described above. The step of fixing the cylinder protrusion is not required.

Specifically, according to the present invention, the inner peripheral surface is formed by airtightly joining the first outer cylinder member and the second outer cylinder member, each of which is provided with the outer cylinder protrusion in advance, at the joint portion. An outer cylinder having an outer cylinder protrusion at a predetermined position can be easily assembled. That is, according to the present invention, it is possible to provide an exhaust gas purification device having a cartridge structure that can be easily manufactured and that can surely achieve airtightness, and a method for manufacturing the exhaust gas purification device.

Other objects, other features and accompanying advantages of the present invention will be readily understood from the description of each embodiment of the invention described with reference to the following drawings.

It is a schematic cross-sectional view which shows an example of the structure of the exhaust gas purification apparatus (first apparatus) which concerns on 1st Embodiment of this invention. It is a schematic cross-sectional view which shows some example of the structure of the outer cylinder protrusion part provided with the outer cylinder which comprises 1st apparatus. It is a schematic cross-sectional view which shows the further example of the structure of the outer cylinder protrusion part provided with the outer cylinder which comprises 1st apparatus. It is a schematic cross-sectional view which shows an example of the structure of the exhaust gas purification apparatus (second apparatus) which concerns on 2nd Embodiment of this invention. It is a schematic cross-sectional view which shows some example of the structure of the outer cylinder provided with the exhaust gas purification apparatus (third apparatus) which concerns on 3rd Embodiment of this invention. It is a schematic cross-sectional view which shows some example of the structure of the outer cylinder provided with the exhaust gas purification apparatus (fourth apparatus) which concerns on 4th Embodiment of this invention. It is a schematic cross-sectional view which shows the further example of the structure of the outer cylinder provided with 4th apparatus. It is a schematic cross-sectional view which shows the further example of the structure of the outer cylinder protrusion part provided in the outer cylinder which comprises the exhaust gas purification apparatus (sixth apparatus) which concerns on 6th Embodiment of this invention. It is a schematic cross-sectional view which shows an example of the structure of the 6th apparatus. It is a schematic cross-sectional view which shows some example of the structure of the inner cylinder protrusion part provided in the inner cylinder which comprises the exhaust gas purification apparatus (8th apparatus) which concerns on 8th Embodiment of this invention. It is a schematic cross-sectional view which shows an example of the structure of the 8th apparatus.

It is a schematic cross-sectional view which shows an example of the structure of the exhaust gas purification apparatus (9th apparatus) which concerns on 9th Embodiment of this invention. FIG. 5 is a schematic cross-sectional view showing one example of the configuration of the ninth device in which the exhaust path is connected to the end of the first outer cylinder. FIG. 5 is a schematic cross-sectional view showing another example of the configuration of the ninth device in which the exhaust path is connected to the end of the first outer cylinder. FIG. 5 is a schematic cross-sectional view showing still another example of the configuration of the ninth device in which the exhaust path is connected to the end of the first outer cylinder. It is a flowchart which shows an example of the flow of the process executed in the manufacturing method (10th method) of the exhaust gas purification apparatus which concerns on 10th Embodiment of this invention. It is a schematic cross-sectional view which shows the component of the exhaust gas purification apparatus (example apparatus) which concerns on embodiment of this invention. It is a schematic cross-sectional view which shows the structure of an Example apparatus. FIG. 18 is an enlarged view of a portion surrounded by a broken line in FIG. It is a schematic perspective view which shows an example of the structure of the inner cylinder provided in the Example apparatus. FIG. 5 is a schematic partial decomposition perspective view showing an example of the configuration of a portion in which the inner cylinder is inserted into the outer cylinder in the apparatus of the embodiment.

It is a schematic cross-sectional view which shows an example of the structure of the exhaust gas purification apparatus (conventional apparatus) which concerns on a prior art. FIG. 22 is an enlarged view of a portion surrounded by a thick broken line of the conventional device illustrated in FIG. 22. It is a schematic diagram which shows the state of trying to fix a guide ring inside an outer cylinder by MIG welding. It is a schematic diagram which shows the state of trying to fix a guide ring inside an outer cylinder by spot welding.

<< First Embodiment >>
Hereinafter, an exhaust gas purification device (hereinafter, may be referred to as a “first device”) will be described in the first embodiment of the present invention.

<Constitution>
The first device is an exhaust gas purification device including an exhaust purification unit, an inner cylinder, an outer cylinder, and a sealing member. The exhaust purification unit purifies the exhaust gas discharged from the internal combustion engine. The inner cylinder is a tubular member that includes an exhaust gas purification unit. The outer cylinder is a tubular member that includes the inner cylinder. The sealing member is a member having an annular shape and being held by sandwiching pressure between the inner cylinder and the outer cylinder to seal between the inner cylinder and the outer cylinder.

The outer cylinder includes an outer cylinder protruding portion which is a portion configured to project from the inner peripheral surface of the outer cylinder inward in the radial direction over the entire circumference at a predetermined position. On the other hand, the inner cylinder is configured to project from the outer peripheral surface of the inner cylinder toward the outside in the radial direction over the entire circumference at a position separated from the outer cylinder protrusion in the exhaust flow direction by a predetermined distance. It is provided with an inner cylinder protruding portion, which is a portion of the pipe. Further, the sealing member is held by sandwiching pressure between the inner cylinder protruding portion and the outer cylinder protruding portion.

In the first device, the outer cylinder is composed of at least a first outer cylinder member and a second outer cylinder member. The first outer cylinder member and the second outer cylinder member are two separate tubular members that are adjacent to each other in the exhaust flow direction and are airtightly joined at a predetermined joint location. Further, either one or both of the first outer cylinder member and the second outer cylinder member is provided with the outer cylinder protrusion at the end closer to the joint portion.

FIG. 1 is a schematic cross-sectional view showing an example of the configuration of the first device. The first device 101 illustrated in FIG. 1 is an exhaust gas purification device including an exhaust gas purification unit 10, an inner cylinder 20, an outer cylinder 30, and a sealing member 40. The exhaust gas purification unit 10 purifies the exhaust gas discharged from the internal combustion engine. Specific examples of such an exhaust purification unit include, for example, a diesel particulate filter (DPF), a diesel oxidation catalyst (DOC), a reduction catalyst is a selective catalytic reduction denitration device (SCR), and ammonia. A slip catalyst (ASC: Ammonia Slip Catalyst) and the like can be mentioned.

The first device 101 is an exhaust gas purification device having a cartridge structure in which the exhaust gas purification unit 10 can be easily attached and detached. Therefore, it is preferable to adopt the first device 101 as an exhaust gas purification device including an exhaust gas purification unit that needs to be attached to and detached from the exhaust gas purification device and / or frequently for the purpose of replacement and / or maintenance, for example. From this point of view, the exhaust purification unit 10 is typically a DPF.

The inner cylinder 20 is a tubular member that includes the exhaust gas purification unit 10. The specific configuration of the inner cylinder 20 is to accommodate the exhaust gas purification unit 10 inside, guide the exhaust gas discharged from an internal combustion engine (not shown) to the exhaust gas purification unit 10, and withstand the usage environment and conditions as an exhaust gas purification device. As long as is possible, there is no particular limitation. Specifically, the inner cylinder 20 may be formed of a tubular member (pipe) made of a metal material such as stainless steel, or a manufacturing method in which a plurality of press-molded members are superposed (so-called "Monaka manufacturing method"). ) May be configured.

The specific method for fixing the exhaust gas purification unit 10 inside the inner cylinder 20 is to fix the exhaust gas purification unit 10 at a predetermined position inside the inner cylinder 20 and to use the exhaust gas purification unit as an exhaust gas purification device. As long as it can withstand the conditions, it is not particularly limited. In the first device 101, the holding member (mat) 11 which is a cushioning material made of a material capable of exerting a restoring force as a repulsion against compression and having sufficient heat resistance is an exhaust gas purification unit 10 and an inner cylinder. The exhaust gas purification unit 10 is held and fixed at a predetermined position inside the inner cylinder 20 by the restoring force of the holding member 11.

As described above, the holding member (mat) 11 is held by sandwiching it between the exhaust gas purification unit 10 and the inner cylinder 20, and the exhaust gas purification unit 10 is placed at a predetermined position inside the inner cylinder 20 by the restoring force of the holding member 11. The method for holding is not particularly limited. Specific examples of such a method include a press-fitting method and a sizing method. The press-fitting method is, for example, an aggregate in which the holding member 11 is wound or fixed in at least a part of the outer peripheral surface of the exhaust gas purification unit 10 while compressing the holding member 11 inside the inner cylinder 20. This is a construction method in which the exhaust gas purification unit 10 is held by the restoring force of the holding member 11 by inserting it (tightly) into a predetermined position. On the other hand, in the sizing method, for example, an aggregate in which the holding member 11 is wound or fixed in at least a part of the outer peripheral surface of the exhaust gas purification unit 10 is assembled without substantially compressing the holding member 11. After inserting (loosely) into a predetermined position inside the inner cylinder 20, the holding member is subjected to diameter reduction processing to reduce the diameter of at least a part of the region of the inner cylinder 20 facing the holding member 11 to a predetermined diameter. This is a construction method in which the exhaust gas purification unit 10 is held by the restoring force of 11.

Specific examples of the material constituting the holding member 11 as described above include inorganic fibers such as alumina-based fibers and alumina-silica fibers, and those obtained by adding a resin as a binder to such inorganic fibers. be able to. Specific examples of the resin used as the binder include acrylic rubber, nitrile rubber, polyvinyl alcohol, and acrylic resin.

The outer cylinder 30 is a tubular member that includes the inner cylinder 20. The specific configuration of the outer cylinder 30 is to accommodate the inner cylinder 20 inside, guide the exhaust gas discharged from an internal combustion engine (not shown) to the exhaust gas purification unit 10, and withstand the usage environment and conditions as an exhaust purification device. As long as it is possible, there is no particular limitation. Specifically, like the inner cylinder 20, the outer cylinder 30 may also be composed of a tubular member (pipe) made of a metal material such as stainless steel, or a plurality of press-molded members may be stacked. It may be configured by a combined manufacturing method (so-called "Monaka manufacturing method").

However, as described above, the outer cylinder 30 included in the first device 101 is composed of at least the first outer cylinder member 30a and the second outer cylinder member 30b. The first outer cylinder member 30a and the second outer cylinder member 30b are two separate tubular members that are adjacent to each other in the exhaust flow direction and are airtightly joined at a predetermined joint location. In other words, the outer cylinder 30 includes at least the first outer cylinder member 30a and the second outer cylinder member 30b, and the first outer cylinder member 30a and the second outer cylinder member 30b are airtight in the manufacturing process of the first apparatus 101. It is assembled by being joined to. A specific method for joining the first outer cylinder member 30a and the second outer cylinder member 30b is that the first outer cylinder member 30a and the second outer cylinder member 30b are airtightly joined and used as an exhaust gas purification device. It is not particularly limited as long as it can withstand the usage environment and usage conditions. Specific examples of such a method include welding and the like.

The sealing member 40 is a member having an annular shape and being held by sandwiching pressure between the inner cylinder 20 and the outer cylinder 30 to seal between the inner cylinder 20 and the outer cylinder 30. The specific configuration of the sealing member 40 is that it has an annular shape and is held under pressure between the inner cylinder 20 and the outer cylinder 30 to seal between the inner cylinder 20 and the outer cylinder 30 and exhaust the air. It is not particularly limited as long as it can withstand the usage environment and usage conditions as a purification device. Specific examples of the sealing member 40 include an expanded graphite gasket, which is a heat-resistant material capable of exerting a restoring force as a repulsion against compression.

The outer cylinder 30 includes an outer cylinder protruding portion 31 which is a portion configured to project from the inner peripheral surface of the outer cylinder 30 inward in the radial direction over the entire circumference at a predetermined position (in FIG. 1). See the shaded area). However, in the first device 101, the outer cylinder 30 is composed of at least the first outer cylinder member 30a and the second outer cylinder member 30b. As described above, the first outer cylinder member 30a and the second outer cylinder member 30b are two separate tubular members that are adjacent to each other in the exhaust flow direction and are airtightly joined at a predetermined joint location. Further, either one or both of the first outer cylinder member 30a and the second outer cylinder member 30b is provided with an outer cylinder protruding portion 31 at an end portion closer to the joint portion. In the first device 101 illustrated in FIG. 1, outer cylinder protruding portions 31a and 31b are provided at ends closer to the joint portion of both the first outer cylinder member 30a and the second outer cylinder member 30b, respectively. However, only one of the outer cylinder protruding portions 31a and 31b may be provided on only one of the first outer cylinder member 30a and the second outer cylinder member 30b.

FIG. 2 is a schematic cross-sectional view showing some examples of the configuration of the outer cylinder protruding portion included in the outer cylinder constituting the first device. In FIG. 2, only the outer cylinder provided with the outer cylinder protruding portion is drawn, and other components constituting the first device are omitted. The outer cylinder protruding portion 31 may be provided only at the end portion closer to the joint portion of the first outer cylinder member 30a, for example, as illustrated in FIG. 2A. Alternatively, the outer cylinder protruding portion 31 may be provided only at the end portion of the second outer cylinder member 30b closer to the joint portion, as illustrated in FIG. 2B, for example. Alternatively, the outer cylinder protruding portion 31 is provided at an end portion closer to the joint portion of both the first outer cylinder member 30a and the second outer cylinder member 30b, as illustrated in FIG. 2C, for example. It may have been.

The specific configuration of the outer cylinder protruding portion 31 is from the inner peripheral surface of the outer cylinder 30 at the end portion closer to the joint portion of either one or both of the first outer cylinder member 30a and the second outer cylinder member 30b. It is not particularly limited as long as it is configured to project inward in the radial direction over the entire circumference and can withstand the usage environment and usage conditions as an exhaust gas purification device. The outer cylinder protruding portion 31 may be a portion formed of a member separate from the first outer cylinder member 30a and the second outer cylinder member 30b, or the first outer cylinder member 30a and the second outer cylinder member 30b. It may be a portion integrally formed with either one or both of the above.

In the former case, the outer cylinder protruding portion 31 may be a portion composed of, for example, a plate-shaped member such as a so-called "baffle", or has various cross-sectional shapes such as polygonal and circular shapes. It may be a portion composed of an annular member. Also in this case, since the outer cylinder protruding portion 31 is provided at the end closer to the joint portion of either one or both of the first outer cylinder member 30a and the second outer cylinder member 30b, the outer cylinder protruding portion 31 is provided at the beginning of the present specification. When the outer cylinder protruding portion 31 is fixed to the outer cylinder 30 by welding as described in the above, the welding torch or the electrode can be easily reached at the position where the outer cylinder protruding portion 31 is fixed.

On the other hand, in the latter case, the outer cylinder protruding portion 31 has, for example, an end portion closer to the joint portion of either one or both of the first outer cylinder member 30a and the second outer cylinder member 30b in the radial direction. It may be a portion that is bent or reduced in diameter over the entire circumference. Such an outer cylinder protruding portion 31 can be easily formed by, for example, plastic working such as spinning.

In addition, the position where the outer cylinder protruding portion 31 is provided at the end closer to the joint portion of either one or both of the first outer cylinder member 30a and the second outer cylinder member 30b is not necessarily the first outer cylinder member. It is not necessary that the end portion of either one or both of the 30a and the second outer cylinder member 30b, which is closer to the joint portion, is exactly aligned with the end portion.

For example, as illustrated in FIG. 2, the outer end portion (base end portion) of the outer cylinder protruding portion 31 in the radial direction is a first outer cylinder member 30a and / or a second outer cylinder provided with the outer cylinder protruding portion 31. It may be located at the end of the member 30b closer to the joint. Alternatively, the outer end portion (base end portion) of the outer cylinder protruding portion 31 in the radial direction is, for example, on the right side (second outer cylinder member) with respect to the paper surfaces of FIGS. 3 (a) and (b) and (c). As illustrated in the outer cylinder protruding member 31b) included in the 30b, the first outer cylinder member 30a and / or the second outer cylinder member 30b may be located on the back side (inner side) of the end portion. Further, as described above, when the outer cylinder protruding portion 31 is formed by a member separate from the first outer cylinder member 30a and the second outer cylinder member 30b, the outer end of the outer cylinder protruding portion 31 in the radial direction. The portion (base end portion) is the base end of the outer cylinder protruding portion 31 as illustrated on the left side (outer cylinder protruding member 31a included in the first outer cylinder member 30a) with respect to the paper surface of FIG. 3 (c), for example. The portion may be located on the front side (outer side) of the first outer cylinder member 30a and / or the second outer cylinder member 30b.

In FIG. 3, as in FIG. 2 described above, only the outer cylinder provided with the outer cylinder protruding portion is drawn, and other components constituting the first device are omitted. Further, in FIG. 3, for the purpose of making it easy to understand the configuration of the outer cylinder protruding portion 31a and / or 31b provided on the first outer cylinder member 30a and / or the second outer cylinder member 30b, the first outer cylinder The separated state before the member 30a and the second outer cylinder member 30b are joined is drawn. Further, in FIG. 3C, a configuration in which the outer cylinder projecting portions 31a and 31b are provided on both the first outer cylinder member 30a and the second outer cylinder member 30b has been illustrated, but as described above. Only one of the outer cylinder protruding portions 31a and 31b may be provided on only one of the first outer cylinder member 30a and the second outer cylinder member 30b.

On the other hand, the inner cylinder 20 projects from the outer peripheral surface of the inner cylinder 20 toward the outside in the radial direction at a position separated from the outer cylinder protruding portion 31 in the exhaust flow direction over the entire circumference. It is provided with an inner cylinder protruding portion 21 which is a portion configured in (see the black-painted portion in FIG. 1). The specific configuration of the inner cylinder protruding portion 21 is such that at a position separated from the outer cylinder protruding portion 31 in the exhaust flow direction by a predetermined distance, the entire circumference of the inner cylinder 20 is outward from the outer peripheral surface in the radial direction. It is not particularly limited as long as it is configured to protrude over the entire surface and can withstand the usage environment and conditions of use as an exhaust gas purification device. The inner cylinder protruding portion 21 may be a portion composed of a plate-shaped member such as a brim-shaped member, or may be composed of an annular member having various cross-sectional shapes such as a polygon and a circle. It may be a part that has been removed. In any case, the inner cylinder protruding portion 21 can be easily provided on the outer peripheral surface of the inner cylinder 20 by a method such as welding.

Further, as described above, the sealing member 40 has an annular shape and is held under pressure between the inner cylinder 20 and the outer cylinder 30 to seal between the inner cylinder 20 and the outer cylinder 30. It is a member. In the first device 101, the sealing member 40 is held under pressure between the inner cylinder protruding portion 21 and the outer cylinder protruding portion 31 (see the shaded portion in FIG. 1). Therefore, the shaft of the outer cylinder 30 and / or the inner cylinder 20 (indicated by the alternate long and short dash line in FIG. 1) of the sealing member 40 in a state where the pressure is not held between the inner cylinder protrusion 21 and the outer cylinder protrusion 31. The dimension in the direction of AX is larger than the distance in the direction of the axis AX between the inner cylinder protruding portion 21 and the outer cylinder protruding portion 31 in the state where the first device 101 is assembled. As a result, in the state where the first device 101 is assembled, the inner cylinder protruding portion 21 and the outer cylinder protruding portion 21 and the outer cylinder protruding due to the restoring force of the sealing member 40 as a repulsion against the compression by the inner cylinder protruding portion 21 and the outer cylinder protruding portion 31. The portion 31 and the sealing member 40 are in close contact with each other, and the space between the inner cylinder 20 and the outer cylinder 30 is sealed.

The surface of the inner cylinder protruding portion 21 in contact with the sealing member 40 does not necessarily have to be a surface perpendicular to the direction of the axis AX. For example, the surface of the inner cylinder protruding portion 21 in contact with the sealing member 40 may be a surface perpendicular to the direction of the shaft AX (parallel to the radial direction of the inner cylinder 20), or the shaft AX. It may be a surface forming a predetermined angle with respect to the direction or the radial direction (direction orthogonal to the axis AX). Further, the surface of the inner cylinder protruding portion 21 in contact with the sealing member 40 may be a flat surface or a curved surface.

The surface of the outer cylinder protruding portion 31 in contact with the sealing member 40 does not necessarily have to be a surface perpendicular to the direction of the axis AX. For example, the surface of the outer cylinder protruding portion 31 in contact with the sealing member 40 may be a surface perpendicular to the direction of the shaft AX (parallel to the radial direction of the outer cylinder 30), or the shaft AX. It may be a surface forming a predetermined angle with respect to the direction or the radial direction (direction orthogonal to the axis AX). Further, the surface of the outer cylinder protruding portion 31 in contact with the sealing member 40 may be a flat surface or a curved surface.

However, as described above, the outer cylinder 30 is a tubular member that includes the inner cylinder 20, and the inner cylinder 20 is inserted inside the outer cylinder protruding portion 31 that protrudes inward from the inner peripheral surface of the outer cylinder 30. Then, the sealing member 40 is held by sandwiching between the inner cylinder protruding portion 21 protruding outward from the outer peripheral surface of the inner cylinder 20 and the outer cylinder protruding portion 31. Therefore, the shape defined by the outer end portion (tip portion) of the inner cylinder protruding portion 21 in the radial direction needs to be smaller than the cross section of the inner peripheral surface of the corresponding portion of the outer cylinder 30. Further, the shape (of the through hole) defined by the inner end portion (tip portion) in the radial direction of the outer cylinder protruding portion 31 needs to be larger than the cross section of the outer peripheral surface of the corresponding portion of the inner cylinder 20. ..

The first device 101 is interposed in the flow path of the exhaust gas discharged from the internal combustion engine so that the exhaust gas flows from one end side of the outer cylinder 30 to the other end side. That is, the direction in which the exhaust gas flows in the first device 101 is not particularly limited. Specifically, for example, the first device 101 is interposed in the flow path of the exhaust gas discharged from the internal combustion engine so that the exhaust gas flows from the first outer cylinder member 30a side to the second outer cylinder member 30b side. Alternatively, the exhaust gas may be interposed in the flow path of the exhaust gas discharged from the internal combustion engine so that the exhaust gas flows from the second outer cylinder member 30b side to the first outer cylinder member 30a side.

<effect>
As described above, in the first device, the outer cylinder is composed of at least the first outer cylinder member and the second outer cylinder member. The first outer cylinder member and the second outer cylinder member are two separate tubular members that are adjacent to each other in the exhaust flow direction and are airtightly joined at a predetermined joint location. Further, either one or both of the first outer cylinder member and the second outer cylinder member is provided with an outer cylinder protruding portion at an end closer to the joint portion. Therefore, unlike the outer cylinder provided in the conventional device described above, the step of fixing the outer cylinder protruding portion deeply in the inner peripheral surface is not required. Specifically, according to the first apparatus, the inner circumference is formed by airtightly joining the first outer cylinder member and the second outer cylinder member, each of which is provided with the outer cylinder protrusion in advance, at the joint portion. An outer cylinder having an outer cylinder protrusion at a predetermined position on the surface can be easily assembled.

Further, in the first device, as described above, due to the restoring force of the sealing member as a repulsion against the compression by the inner cylinder protruding portion and the outer cylinder protruding portion, the inner cylinder protruding portion, the outer cylinder protruding portion and the sealing member are formed. Is in close contact with each other, and the space between the inner cylinder and the outer cylinder is sealed. That is, in a state where the first device is assembled, the sealing member is compressed and deformed between the inner cylinder protruding portion and the outer cylinder protruding portion to hold the pinching pressure. Therefore, even if the distance between the inner cylinder protruding portion and the outer cylinder protruding portion in the exhaust flow direction deviates from the design value due to, for example, an assembly error and a dimensional error of the inner cylinder and the outer cylinder, the sealing member By increasing or decreasing the amount of deformation of, the sealing between the inner cylinder and the outer cylinder can be reliably maintained. That is, according to the first device, it is possible to provide an exhaust gas purification device having a cartridge structure that can be easily manufactured and that can surely achieve airtightness.

<< Second Embodiment >>
Hereinafter, an exhaust gas purification device (hereinafter, may be referred to as a “second device”) will be described in the second embodiment of the present invention.

As described above, in the exhaust gas purification device (device of the present invention) according to the present invention including the first device, either or both of the first outer cylinder member and the second outer cylinder member constituting the outer cylinder are used. , An outer cylinder protrusion is provided at the end closer to these joints. That is, the outer cylinder protruding portion may be provided at the end portion closer to the joint portion of only one of the first outer cylinder member and the second outer cylinder member, or the first outer cylinder member and the first outer cylinder member. 2. Both of the outer cylinder members may be provided at the end portions closer to the joint portion.

However, from the viewpoint of simplifying the structure of the outer cylinder and reducing problems such as complicated manufacturing process of the outer cylinder and increase in manufacturing cost, only one of the first outer cylinder member and the second outer cylinder member is used. It is preferable that the outer cylinder protruding portion is provided at the end portion of the.

<Constitution>
Therefore, the second device is the above-mentioned first device, and is an exhaust gas purification device in which only the third outer cylinder member, which is one of the first outer cylinder member and the second outer cylinder member, has an outer cylinder protruding portion. be.

As described above, the third outer cylinder member is a member of the first outer cylinder member and the second outer cylinder member that includes an outer cylinder protruding portion. Since the details of the first outer cylinder member and the second outer cylinder member have already been described in the above-described description of the first device, the description will not be repeated here.

FIG. 4 is a schematic cross-sectional view showing an example of the configuration of the second device. In the second device 102 illustrated in FIG. 4, the first outer cylinder member 30a constituting the outer cylinder 30 does not have the outer cylinder protrusion 31a, and the outer cylinder protrusion 30b including the second outer cylinder member 30b constituting the outer cylinder 30 is provided. It has the same configuration as the first device 101 illustrated in FIG. 1, except that the outer cylinder protruding portion 31 is formed only by the portion 31b. That is, in the second device 102 illustrated in FIG. 4, the second outer cylinder member 30b corresponds to the third outer cylinder member 30c, and the outer cylinder protrusion provided by the second outer cylinder member 30b as the third outer cylinder member 30c. A sealing member 40 is held by sandwiching between the portion 31b and the inner cylinder protruding member 21 included in the inner cylinder 20, and seals between the inner cylinder 20 and the outer cylinder 30. On the other hand, the first outer cylinder member 30a does not include the outer cylinder protruding portion 31a and is composed of a member having a simple tubular shape.

<effect>
As described above, in the second device, the outer cylinder protruding portion is provided at the end of only one of the first outer cylinder member and the second outer cylinder member. Therefore, it is possible to simplify the members constituting the outer cylinder and reduce problems such as complicated manufacturing process of the outer cylinder and increase in manufacturing cost.

<< Third Embodiment >>
Hereinafter, an exhaust gas purification device (hereinafter, may be referred to as a “third device”) will be described in the third embodiment of the present invention.

As described above, in the second device, only the third outer cylinder member, which is one of the first outer cylinder member and the second outer cylinder member, includes the outer cylinder protruding portion. Therefore, the member of the first outer cylinder member and the second outer cylinder member that is not the third outer cylinder member does not have an outer cylinder protrusion, and therefore, for example, is composed of a member having a simple tubular shape. Can be done. Further, as described above, the first outer cylinder member and the second outer cylinder member are joined to each other to form an outer cylinder. From the viewpoint of facilitating the joining between the first outer cylinder member and the second outer cylinder member and improving the airtightness, the one of the first outer cylinder member and the second outer cylinder member that is not the third outer cylinder member. It is preferable that the member is fitted onto the third outer cylinder member and the two are joined.

<Constitution>
Therefore, the third device is the second device described above, and the fourth outer cylinder member, which is the other of the first outer cylinder member and the second outer cylinder member and is not the third outer cylinder member, is the third at the joint portion. It is an exhaust gas purification device that is fitted on the outer cylinder member.

The specific configuration of the fourth outer cylinder member is not particularly limited as long as it can be externally fitted to the third outer cylinder member at the joint. Specifically, for example, the shape of the inner peripheral surface of the portion of the fourth outer cylinder member that fits with the third outer cylinder member is the outer peripheral surface of the portion of the third outer cylinder member that fits with the fourth outer cylinder member. It has a shape along the line. The portion of the fourth outer cylinder member other than the relevant portion may have the same shape as the relevant portion, or may have a shape different from the relevant portion. For example, a portion of the fourth outer cylinder member other than the relevant portion may have a cross section smaller than the relevant portion, or may have a cross section larger than the relevant portion. However, typically, the portion of the fourth outer cylinder member other than the portion has the same shape as the portion. That is, typically, the fourth outer cylinder member is a straight tubular member that fits with the third outer cylinder member.

FIG. 5 is a schematic cross-sectional view showing some examples of the configuration of the outer cylinder included in the third device. Also in FIG. 5, similarly to FIGS. 2 and 3 described above, only the outer cylinder provided with the outer cylinder protruding portion is drawn, and other components constituting the third device are omitted. In the outer cylinder 30 illustrated in FIG. 5A, the outer cylinder protruding portion 31 is formed only by the outer cylinder protruding portion 31a included in the first outer cylinder member 30a, and the second outer cylinder member 30b is the outer cylinder. The second outer cylinder member 30b is fitted onto the first outer cylinder member 30a at the joint without the protrusion 31b. That is, of the first outer cylinder member 30a and the second outer cylinder member 30b, the first outer cylinder member 30a corresponds to the third outer cylinder member 30c, and the second outer cylinder member 30b corresponds to the fourth outer cylinder member 30d. do. On the other hand, in the outer cylinder 30 illustrated in FIG. 5B, the outer cylinder protruding portion 31 is formed only by the outer cylinder protruding portion 31b included in the second outer cylinder member 30b, and the first outer cylinder member 30a is The outer cylinder protruding portion 31a is not provided, and the first outer cylinder member 30a is externally fitted to the second outer cylinder member 30b at the joint portion. That is, of the first outer cylinder member 30a and the second outer cylinder member 30b, the first outer cylinder member 30a corresponds to the fourth outer cylinder member 30d, and the second outer cylinder member 30b corresponds to the third outer cylinder member 30c. do.

<effect>
As described above, in the third device, only the third outer cylinder member, which is one of the first outer cylinder member and the second outer cylinder member constituting the outer cylinder, is provided with the outer cylinder protruding portion, and the first outer cylinder member is provided. The fourth outer cylinder member, which is the other of the cylinder member and the second outer cylinder member and is not the third outer cylinder member, is outerly fitted to the third outer cylinder member at the joint. As a result, according to the third device, the joining between the first outer cylinder member and the second outer cylinder member can be facilitated and the airtightness can be improved.

<< Fourth Embodiment >>
Hereinafter, an exhaust gas purification device (hereinafter, may be referred to as a “fourth device”) will be described in the fourth embodiment of the present invention.

As described above, the specific configuration of the outer cylinder protruding portion is the inner peripheral surface of the outer cylinder at the end portion closer to the joint portion of either one or both of the first outer cylinder member and the second outer cylinder member. It is not particularly limited as long as it is configured to protrude inward in the radial direction from the entire circumference and can withstand the usage environment and usage conditions as an exhaust gas purification device. The outer cylinder protruding portion may be a portion composed of a member separate from the first outer cylinder member and the second outer cylinder member, or either one of the first outer cylinder member and the second outer cylinder member, or It may be a portion integrally formed with both.

However, from the viewpoint of simplifying the structure of the outer cylinder and reducing problems such as complicated manufacturing process of the outer cylinder and increase in manufacturing cost, either one of the first outer cylinder member and the second outer cylinder member or It is preferable that the outer cylinder protruding portion is formed integrally with both.

<Constitution>
Therefore, the fourth device is any of the first to third devices described above, and the outer cylinder protruding portion is integrally formed with either one or both of the first outer cylinder member and the second outer cylinder member. Is the part that was done,
It is an exhaust gas purification device.

As described above, in the fourth device, the outer cylinder protruding portion is formed integrally with either one or both of the first outer cylinder member and the second outer cylinder member. In this case, the outer cylinder protruding portion is bent or reduced in diameter over the entire circumference, for example, at the ends of either or both of the first outer cylinder member and the second outer cylinder member inward in the radial direction. It may be a part. Such an outer cylinder protruding portion can be easily formed by, for example, plastic working such as spinning.

FIG. 6 is a schematic cross-sectional view showing some examples of the configuration of the outer cylinder included in the fourth device. Also in FIG. 6, similarly to FIGS. 2, 3 and 5 described above, only the outer cylinder provided with the outer cylinder protrusion is drawn, and other components constituting the fourth device are omitted. There is. Further, similarly to FIG. 3 described above, the first outer cylinder member and / or the second outer cylinder member and the second outer cylinder member are provided for the purpose of making it easier to understand the configuration of the outer cylinder protruding portion provided on the first outer cylinder member and / or the second outer cylinder member. The separated state before being joined to the outer cylinder member is drawn. Further, since the outer cylinder protruding portion is integrally formed with either one or both of the first outer cylinder member and the second outer cylinder member included in the fourth device, from FIGS. 2, 3 and 5 described above. However, the structure of the outer cylinder is drawn in a more simplified manner.

In the outer cylinder 30 illustrated in FIGS. 6A and 6B, the outer cylinder protruding portion 31 is integrally formed with both the first outer cylinder member 30a and the second outer cylinder member 30b. .. Further, in the outer cylinder 30 illustrated in FIGS. 6 (c) to 6 (f), the outer cylinder protruding portion 31 is integrally formed with either one of the first outer cylinder member 30a and the second outer cylinder member 30b. ing. In the outer cylinder 30 illustrated in FIG. 6 (e), the outer cylinder is bent at a predetermined position by bending the cylinder wall of any one of the first outer cylinder member 30a and the second outer cylinder member 30b. A protruding portion 31 is formed. On the other hand, in the outer cylinder 30 illustrated in FIG. 6 (f), the cylinder wall of any one of the first outer cylinder member 30a and the second outer cylinder member 30b faces inward in the radial direction at a predetermined position. The outer cylinder projecting portion 31 is formed by a portion processed so as to project over the entire circumference.

Further, the outer cylinder included in the fourth device is also the third member of the first outer cylinder member and the second outer cylinder member, which is the member having the outer cylinder protruding portion, like the outer cylinder provided in the third device. A fourth outer cylinder member, which is a member of which the outer cylinder member does not have an outer cylinder protrusion, may be externally fitted at the joint. FIG. 7 is a schematic cross-sectional view showing a further example of the configuration of the outer cylinder included in the fourth device. Also in FIG. 7, similarly to FIG. 6 described above, only the outer cylinder provided with the outer cylinder protruding portion is drawn in a simplified manner, and other components constituting the fourth device are omitted. Further, for the purpose of making it easy to understand the fitting state of the first outer cylinder member and the second outer cylinder member, it is drawn as if there is a gap between the first outer cylinder member and the second outer cylinder member. However, in reality, the first outer cylinder member and the second outer cylinder member are airtightly joined.

The outer cylinder 30 illustrated in FIGS. 7A and 7B is a member (third outer cylinder member) of the first outer cylinder member 30a and the second outer cylinder member 30b, which has the outer cylinder protrusion 31. The outer cylinder 30 illustrated in FIGS. 6 (c) and 6 (d) described above, except that the member (fourth outer cylinder member) having no outer cylinder protrusion is fitted on the outer cylinder at the joint. Has the same configuration as. Further, the outer cylinder 30 illustrated in FIGS. 7 (c) and 7 (d) is a member (third outer cylinder) of the first outer cylinder member 30a and the second outer cylinder member 30b, which has the outer cylinder protruding portion 31. Except for the point that the member (fourth outer cylinder member) having no outer cylinder protrusion is fitted on the cylinder member) at the joint, the outside illustrated in FIGS. 6 (e) and 6 (f) described above. It has the same configuration as the cylinder 30.

<effect>
As described above, in the fourth device, the outer cylinder protruding portion is formed integrally with either one or both of the first outer cylinder member and the second outer cylinder member. As a result, according to the fourth apparatus, it is possible to reduce problems such as complicated manufacturing process of the outer cylinder and increase in manufacturing cost by simplifying the configuration of the outer cylinder and reducing the number of parts.

<< Fifth Embodiment >>
Hereinafter, an exhaust gas purification device (hereinafter, may be referred to as a “fifth device”) will be described in the fifth embodiment of the present invention.

As described above, the surface of the outer cylinder protruding portion in contact with the sealing member may be a surface perpendicular to the axial direction of the outer cylinder (parallel to the radial direction of the outer cylinder), or the outer surface. It may be a surface forming a predetermined angle with respect to the axial direction or the radial direction of the cylinder.

<Constitution>
Therefore, the fifth device is any of the first to fourth devices described above, and is configured such that the surface of the outer cylinder protruding portion in contact with the sealing member is perpendicular to the axial direction of the outer cylinder. It is an exhaust purification device.

As described above, the surface of the outer cylinder protruding portion of the fifth device that comes into contact with the sealing member is configured as a surface perpendicular to the axial direction of the outer cylinder. Specific examples of such an outer cylinder protruding portion include, for example, (a) and (b) of FIGS. 1, 2, and 3 and (a) and (c) of FIGS. 4, 5, and 6 described above. , And the outer cylinder protrusion 31 and the like illustrated in FIG. 7A. Further, the outer cylinder protruding portion 31 illustrated in FIG. 3C extends along the inner peripheral surfaces of the first outer cylinder member 30a and the second outer cylinder member 30b and is fixed to the inner peripheral surface. A fixed portion, which is a portion of the above, is provided on the base end side thereof, but when the thickness of the fixed portion (dimension in the radial direction of the outer cylinder 30) is sufficiently small, the outer cylinder illustrated in FIG. The protruding portion 31 also corresponds to the outer cylinder protruding portion included in the fifth device.

<effect>
As described above, in the fifth device, the surface of the outer cylinder protruding portion in contact with the sealing member is a surface perpendicular to the axial direction of the outer cylinder. As a result, the position of the end portion of the sealing member held by being sandwiched between the inner cylinder protruding portion and the outer cylinder protruding portion on the outer cylinder protruding portion side can be reliably fixed, and the outer cylinder of the sealing member can be reliably fixed. The end portion on the protruding portion side can be uniformly compressed so that the restoring force as a repulsion against the compression can be uniformly applied. Further, for example, when the outer cylinder protruding portion is formed of a plate-shaped member such as a baffle, the structure of the member is simplified to reduce problems such as complication of the manufacturing process of the member and an increase in manufacturing cost. be able to.

<< 6th Embodiment >>
Hereinafter, an exhaust gas purification device (hereinafter, may be referred to as a “sixth device”) will be described in the sixth embodiment of the present invention.

As described above, the surface of the outer cylinder protruding portion in contact with the sealing member may be a surface perpendicular to the axial direction of the outer cylinder (parallel to the radial direction of the outer cylinder), or the outer surface. It may be a surface forming a predetermined angle with respect to the axial direction or the radial direction of the cylinder. Further, the surface of the outer cylinder protruding portion in contact with the sealing member may be a flat surface or a curved surface.

<Constitution>
Therefore, the sixth device is any of the first to fourth devices described above, and the inner diameter gradually decreases as the surface of the outer cylinder protruding portion in contact with the sealing member advances toward the first direction. It is an exhaust gas purification device configured to have a tapered shape. The first direction is the direction in which the inner cylinder is inserted into the outer cylinder when the inner cylinder is included in the outer cylinder.

The specific shape of the surface of the outer cylinder protruding portion in contact with the sealing member is not particularly limited as long as it has a tapered shape in which the inner diameter gradually decreases as it advances toward the first direction. The change in the inner diameter in the tapered shape may be linear or curved. In other words, the shape of the surface of the outer cylinder protruding portion in contact with the sealing member in the cross section of the plane including the axis of the outer cylinder may be a straight line or a curved line.

Specific examples of the outer cylinder protruding portion as described above include, for example, the outer cylinder protruding portion 31 illustrated in FIGS. 6 (b) and 6 (d) and FIG. 7 (b) described above. Further, in FIG. 6B, the outer cylinder protruding portion 31 is formed on both the first outer cylinder member 30a and the second outer cylinder member 30b, but the first outer cylinder member 30a and the second outer cylinder are formed. Of the members 30b, the member on the right side facing the paper surface may not have the outer cylinder protruding portion 31, and only the member on the left side facing the paper surface may have the outer cylinder protruding portion 31. Further, the outer cylinder projecting portions 31 illustrated in FIGS. 6 (e) and 6 (f) and 7 (c) and (d) also also move toward the first direction as the surface in contact with the sealing member advances. As long as it has a tapered shape in which the inner diameter gradually decreases, it corresponds to the outer cylinder protruding portion provided in the sixth device.

When these outer cylinder protrusions 31 correspond to the outer cylinder protrusions included in the outer cylinders constituting the sixth device, the direction from the right side to the left side in these drawings corresponds to the first direction. In other words, when the inner cylinder is inserted into the outer cylinder from the right side to the left side toward the paper surface at the time of assembling the exhaust gas purification device provided with the outer cylinder protrusion 31 illustrated in these drawings, these The outer cylinder protruding portion 31 corresponds to the outer cylinder protruding portion included in the sixth device. By the way, each of the outer cylinder projecting portions 31 illustrated in these drawings is a portion integrally formed with either one or both of the first outer cylinder member and the second outer cylinder member, but as described above, as described above. The outer cylinder protruding portion included in the outer cylinder constituting the sixth device may be a portion formed by a member separate from the first outer cylinder member and the second outer cylinder member.

FIG. 8 is a schematic cross-sectional view showing a further example of the configuration of the outer cylinder protruding portion included in the outer cylinder constituting the sixth device. Also in FIG. 8, as in FIGS. 2, 3 and 5 described above, only the outer cylinder provided with the outer cylinder protrusion is drawn, and other components constituting the sixth device are omitted. There is. In FIG. 8, the first direction, which is the direction in which the inner cylinder is inserted into the outer cylinder when the inner cylinder is included in the outer cylinder, is indicated by a white arrow. In the outer cylinder 30 illustrated in FIG. 8A, for example, the outer cylinder protruding portion 31a made of a separate member having a tapered shape corresponding to the side surface of the truncated cone is the inner peripheral surface of the first outer cylinder member 30a. It is fixed by welding to the end portion on the joint portion side with the second outer cylinder member 30b. On the other hand, in the outer cylinder 30 illustrated in FIG. 8B, the outer cylinder protruding portion 31b made of a separate member having the same shape as the outer cylinder protruding portion 31a illustrated in (a) is the second outer cylinder member. It is fixed by welding to the end of the inner peripheral surface of 30b on the joint portion side with the first outer cylinder member 30a.

Further, in the outer cylinder 30 illustrated in FIG. 8C, the outer cylinder protruding portion 31a is formed by an annular member having a trapezoidal cross section having a slope whose inner diameter gradually decreases toward the first direction. Is configured. Then, such an outer cylinder protruding portion 31a is fixed to the end portion of the inner peripheral surface of the first outer cylinder member 30a on the joint portion side with the second outer cylinder member 30b by welding. That is, also in the outer cylinder 30 illustrated in FIG. 8 (c), the inner diameter gradually decreases (linearly) as the surface of the outer cylinder protruding portion 31 in contact with the sealing member advances toward the first direction. It is configured to have a tapered shape.

Further, the outer cylinder 30 illustrated in FIG. 8D has a semicircular cross section protruding inward in the radial direction of the outer cylinder 30 from the inner peripheral surface side of the second outer cylinder member 30b. The outer cylinder protruding portion 31b is formed by an annular member. Then, the first outer cylinder of the second outer cylinder member 30b is such that the outer cylinder protruding portion 31b is in contact with the inner peripheral surface of the second outer cylinder member 30b so that the chord (diameter) portion of the semicircular cross section is in contact with the inner peripheral surface of the second outer cylinder member 30b. It is fixed by welding to the end on the joint portion side with the member 30a. As a result, the outer cylinder 30 illustrated in FIG. 8D also gradually has an inner diameter (curved) as the surface of the outer cylinder protruding portion 31 in contact with the sealing member advances toward the first direction. It is configured to have a smaller tapered shape.

Next, FIG. 9 is a schematic cross-sectional view showing an example of the configuration of the sixth device. Also in FIG. 9, the first direction, which is the direction in which the inner cylinder is inserted into the outer cylinder when the inner cylinder is included in the outer cylinder, is indicated by a white arrow. The sixth device 106 illustrated in FIG. 9 includes an outer cylinder 30 having the same configuration as the outer cylinder 30 illustrated in FIG. 7 (b). That is, the outer cylinder protruding portion 31 included in the sixth device 106 has a tapered shape in which the inner diameter gradually decreases as the surface in contact with the sealing member 40 advances in the first direction, and the second outer cylinder It is integrally formed with the member 30b.

<effect>
As described above, in the sixth device, the surface of the outer cylinder protruding portion in contact with the sealing member is configured to have a tapered shape in which the inner diameter gradually decreases as it advances toward the first direction. There is. Therefore, when the inner cylinder is inserted into the outer cylinder in the assembling process of the sixth device, the end portion of the sealing member on the outer cylinder protruding portion side comes into contact with the tapered surface of the outer cylinder protruding portion. Since this surface is configured so that the inner diameter gradually decreases as it advances toward the first direction as described above, the shaft of the inner cylinder becomes the shaft of the outer cylinder as the inner cylinder is inserted inside the outer cylinder. The inner cylinder is urged via the sealing member so as to approach. This makes it possible to reduce the problem that the position of the inner cylinder in the radial direction of the outer cylinder deviates from a predetermined position based on the design due to, for example, an assembly error and a dimensional error of the inner cylinder and the outer cylinder.

Further, also in the sixth device, since the sealing member is held by sandwiching between the inner cylinder protruding portion and the outer cylinder protruding portion, for example, the inner cylinder and the outer cylinder and the outer cylinder are similar to the first to fifth devices described above. Even if the distance between the inner cylinder protrusion and the outer cylinder protrusion in the exhaust flow direction deviates from the design value due to cylinder assembly error, dimensional error, etc., due to the increase or decrease in the amount of deformation of the sealing member, The sealing between the inner cylinder and the outer cylinder can be maintained.

As described above, according to the sixth device, the inner cylinder is fixed at a predetermined position inside the outer cylinder without excessively strictly controlling the dimensional accuracy of the inner cylinder and the outer cylinder, and the inner cylinder and the outer cylinder are fixed. The sealing between and can be reliably achieved. That is, according to the sixth device, it is possible to provide an exhaust gas purification device having a cartridge structure that can be manufactured more easily and can surely achieve airtightness.

<< 7th Embodiment >>
Hereinafter, an exhaust gas purification device (hereinafter, may be referred to as a “seventh device”) will be described in the seventh embodiment of the present invention.

As described above, the surface of the protruding portion of the inner cylinder that comes into contact with the sealing member may be a surface that is perpendicular to the axial direction of the inner cylinder (parallel to the radial direction of the inner cylinder), or may be an inner surface. It may be a surface forming a predetermined angle with respect to the axial direction or the radial direction of the cylinder.

<Constitution>
Therefore, the seventh device is any of the first to sixth devices described above, and is configured such that the surface of the inner cylinder protruding portion in contact with the sealing member is perpendicular to the axial direction of the inner cylinder. It is an exhaust purification device.

As described above, the surface of the inner cylinder protruding portion of the sixth device that comes into contact with the sealing member is configured as a surface perpendicular to the axial direction of the inner cylinder. Specific examples of such an inner cylinder protruding portion include, for example, the inner cylinder protruding portion 21 illustrated in FIGS. 1, 4 and 9 described above.

<effect>
As described above, in the seventh apparatus, the surface of the inner cylinder protruding portion in contact with the sealing member is a surface perpendicular to the axial direction of the inner cylinder. As a result, the position of the end portion of the sealing member held by being sandwiched between the inner cylinder protruding portion and the outer cylinder protruding portion on the inner cylinder protruding portion side can be reliably fixed, and the inner cylinder of the sealing member can be fixed. The end portion on the protruding portion side can be uniformly compressed so that the restoring force as a repulsion against the compression can be uniformly applied. Further, for example, when the inner cylinder protruding portion is formed of a plate-shaped member such as a baffle, the structure of the member is simplified to reduce problems such as complication of the manufacturing process of the member and an increase in manufacturing cost. be able to.

<< 8th Embodiment >>
Hereinafter, an exhaust gas purification device (hereinafter, may be referred to as an “eighth device”) will be described in the eighth embodiment of the present invention.

As described above, the surface of the protruding portion of the inner cylinder that comes into contact with the sealing member may be a surface that is perpendicular to the axial direction of the inner cylinder (parallel to the radial direction of the inner cylinder), or may be an inner surface. It may be a surface forming a predetermined angle with respect to the axial direction or the radial direction of the cylinder. Further, the surface of the inner cylinder protruding portion in contact with the sealing member may be a flat surface or a curved surface.

<Constitution>
Therefore, the eighth device is any of the first to sixth devices described above, and the outer diameter gradually increases as the surface of the inner cylinder protruding portion in contact with the sealing member advances toward the first direction. It is an exhaust gas purification device configured to have a small tapered shape. The first direction is the direction in which the inner cylinder is inserted inside the outer cylinder when the inner cylinder is included in the outer cylinder.

The specific shape of the surface of the inner cylinder protruding portion in contact with the sealing member is not particularly limited as long as it has a tapered shape in which the outer diameter gradually decreases as it advances toward the first direction. The change in the inner diameter in the tapered shape may be linear or curved. In other words, the shape of the surface of the inner cylinder protruding portion in contact with the sealing member in the cross section of the plane including the axis of the inner cylinder may be a straight line or a curved line. The surface of the eighth device that comes into contact with the sealing member of the outer cylinder protruding portion may be a surface that is perpendicular to the axial direction of the outer cylinder (parallel to the radial direction of the outer cylinder), or , It may be a surface forming a predetermined angle with respect to the axial direction or the radial direction of the outer cylinder.

FIG. 10 is a schematic cross-sectional view showing some examples of the configuration of the inner cylinder protruding portion included in the inner cylinder constituting the eighth device. In FIG. 10, only the inner cylinder provided with the inner cylinder protruding portion is drawn, and other components constituting the eighth device are omitted. Further, when the inner cylinder is included in the outer cylinder, the first direction in which the inner cylinder is inserted inside the outer cylinder is indicated by a white arrow. In the inner cylinder 20 illustrated in FIG. 10A, for example, the inner cylinder protruding portion 21 made of a separate member having a tapered shape corresponding to the side surface of the truncated cone is positioned at a predetermined position on the outer peripheral surface of the inner cylinder 20. It is fixed by welding to.

Further, in the inner cylinder 20 illustrated in FIG. 10B, the inner cylinder protruding portion is formed by an annular member having a trapezoidal cross section having a slope whose outer diameter gradually decreases as it advances toward the first direction. 21 is configured. Then, such an inner cylinder protruding portion 21 is fixed at a predetermined position on the outer peripheral surface of the inner cylinder 20 by welding. That is, also in the inner cylinder 20 illustrated in FIG. 10B, the outer diameter gradually increases (in a straight line) as the surface of the inner cylinder protruding portion 21 in contact with the sealing member advances toward the first direction. It is configured to have a smaller tapered shape.

Further, in the inner cylinder 20 illustrated in FIG. 10 (c), an annular shape having a semicircular cross section protruding outward in the radial direction of the inner cylinder 20 from a predetermined position on the outer peripheral surface of the inner cylinder 20. The inner cylinder protruding portion 21 is formed by the members of the above. Then, such an inner cylinder protruding portion 21 is fixed by welding at a predetermined position on the outer peripheral surface of the inner cylinder 20 so that the string (diameter) portion of the semicircular cross section is in contact with the outer peripheral surface of the inner cylinder 20. ing. As a result, the inner cylinder 20 illustrated in FIG. 10 (c) also gradually has an outer diameter (curved) as the surface of the inner cylinder protruding portion 21 in contact with the sealing member advances toward the first direction. ) It is configured to have a small tapered shape.

Next, FIG. 11 is a schematic cross-sectional view showing an example of the configuration of the eighth device. Also in FIG. 11, when the inner cylinder is included in the outer cylinder, the first direction in which the inner cylinder is inserted into the outer cylinder is indicated by a white arrow. The inner cylinder protruding portion 21 included in the eighth device 108 illustrated in FIG. 11 has basically the same configuration as the inner cylinder protruding portion 21 illustrated in FIG. 10 (a). However, on the base end side of the inner cylinder protruding portion 21 included in the eighth device 108, a fixed portion which is an annular portion extending along the outer peripheral surface of the inner cylinder 20 is formed, and the fixed portion is formed. The inner cylinder protruding portion 21 is fixed at a predetermined position on the outer peripheral surface of the inner cylinder 20 by being welded to the outer peripheral surface of the inner cylinder 20.

On the other hand, the outer cylinder 30 included in the eighth device 108 has the same configuration as the second outer cylinder member 30b included in the sixth device 106 illustrated in FIG. That is, the outer cylinder protruding portion 31 included in the eighth device 108 has a tapered shape in which the inner diameter gradually decreases as the surface in contact with the sealing member 40 advances in the first direction, and the second outer cylinder It is integrally formed with the member 30b.

<effect>
As described above, in the eighth device, the surface of the inner cylinder protruding portion in contact with the sealing member is configured to have a tapered shape in which the outer diameter gradually decreases as it advances toward the first direction. ing. Therefore, when the inner cylinder is inserted into the outer cylinder in the process of assembling the eighth device, the end portion of the sealing member on the inner cylinder protruding portion side comes into contact with the tapered surface of the inner cylinder protruding portion. Since this surface is configured so that the outer diameter gradually decreases as it advances toward the first direction as described above, the shaft of the inner cylinder becomes the outer cylinder as the inner cylinder is inserted inside the outer cylinder. The inner cylinder is urged via the sealing member so as to approach the shaft. This makes it possible to reduce the problem that the position of the inner cylinder in the radial direction of the outer cylinder deviates from a predetermined position based on the design due to, for example, an assembly error and a dimensional error of the inner cylinder and the outer cylinder.

As described above, the surface of the eighth device that comes into contact with the sealing member of the outer cylinder protrusion is a surface that is perpendicular to the axial direction of the outer cylinder (parallel to the radial direction of the outer cylinder). Alternatively, it may be a surface forming a predetermined angle with respect to the axial direction or the radial direction of the outer cylinder. However, as in the eighth device 108 illustrated in FIG. 11, the surface of the outer cylinder protruding portion in contact with the sealing member is made a tapered surface substantially parallel to the tapered surface of the inner cylinder protruding portion. 8 To further enhance the effect of the inner cylinder being urged through the sealing member so that the shaft of the inner cylinder approaches the shaft of the outer cylinder when the inner cylinder is inserted into the inside of the outer cylinder in the process of assembling the device. Can be done. This makes it possible to more reliably reduce the problem that the position of the inner cylinder in the radial direction of the outer cylinder deviates from a predetermined position based on the design due to, for example, an assembly error and a dimensional error of the inner cylinder and the outer cylinder. ..

Further, also in the eighth device, since the sealing member is held by sandwiching between the inner cylinder protruding portion and the outer cylinder protruding portion, for example, the inner cylinder and the outer cylinder and the outer cylinder are similarly held in the same manner as the first to seventh devices described above. Even if the distance between the inner cylinder protrusion and the outer cylinder protrusion in the exhaust flow direction deviates from the design value due to cylinder assembly error, dimensional error, etc., due to the increase or decrease in the amount of deformation of the sealing member, The sealing between the inner cylinder and the outer cylinder can be maintained.

As described above, according to the eighth device, the inner cylinder is fixed at a predetermined position inside the outer cylinder without excessively strictly controlling the dimensional accuracy of the inner cylinder and the outer cylinder, and the inner cylinder and the outer cylinder are fixed. The sealing between and can be reliably achieved. That is, according to the eighth device, it is possible to provide an exhaust gas purification device having a cartridge structure that can be manufactured more easily and can surely achieve airtightness.

<< 9th Embodiment >>
Hereinafter, an exhaust gas purification device (hereinafter, may be referred to as a “9th device”) will be described in the 9th embodiment of the present invention.

As described at the beginning of this specification, in the exhaust gas purification device adopting the cartridge method, the inner cylinder is inserted from one end to the other end of the outer cylinder, and the inner cylinder is the outer cylinder on one end side of the outer cylinder. It is generally assembled in.

<Constitution>
Therefore, the ninth device is any of the first to eighth devices described above, and is at the end of the outer cylinder on the side where the inner cylinder is inserted into the outer cylinder when the inner cylinder is included in the outer cylinder. An exhaust gas purification device in which an inner cylinder is detachably fixed to an outer cylinder at a certain first outer cylinder end.

A specific method for fixing the inner cylinder to the outer cylinder at the end of the first outer cylinder is to make the inner cylinder containing the exhaust gas purification unit that purifies the exhaust gas discharged from the internal combustion engine removable inside the outer cylinder. It is not particularly limited as long as it can be inserted and can withstand the usage environment and conditions of use as an exhaust gas purification device.

<Modification example 9-1>
As described at the beginning of this specification, in the exhaust gas purification device adopting the cartridge method, for example, an inner cylinder containing an exhaust purification unit such as a DPF is inserted from one end to the other end of the outer cylinder. , It is common that the flanges provided at one end of the inner cylinder and the outer cylinder are brought into contact with each other, and the inner cylinder is fixed to the outer cylinder by using a fastening member such as a bolt.

Therefore, in the ninth apparatus according to the modified example 9-1, the end portion of the first inner cylinder, which is the end portion of the inner cylinder on the end portion side of the first outer cylinder in the axial direction of the inner cylinder, is directed toward the outside in the radial direction. The inner cylinder is provided with an inner cylinder flange which is a portion protruding over the entire circumference, and an outer cylinder flange which is a portion protruding outward in the radial direction at the end of the first outer cylinder. Is provided by the outer cylinder. Then, the inner cylinder is fixed to the outer cylinder by bringing the inner cylinder flange and the outer cylinder flange into contact with each other and fastening them.

<Modification example 9-2>
By the way, in the ninth device, the inner cylinder is fixed to the outer cylinder at the end of the first outer cylinder as described above. Therefore, as described at the beginning of this specification, for example, due to an assembly error and a dimensional error of the inner cylinder and the outer cylinder, the outer cylinder is formed at an end opposite to the first outer cylinder end of the inner cylinder. There is a risk that the position of the inner cylinder inside will deviate from the intended position. In order to reduce such deviation, it is necessary to strictly control the dimensional accuracy of the inner cylinder and the outer cylinder, which may lead to an increase in manufacturing cost as a result.

Therefore, in the ninth apparatus according to the modified example 9-2, it is preferable that the inner cylinder protruding portion is arranged at a position farther from the end portion of the first outer cylinder than the center in the axial direction of the inner cylinder.

FIG. 12 is a schematic cross-sectional view showing an example of the configuration of the ninth device. Also in FIG. 12, when the inner cylinder is included in the outer cylinder, the first direction in which the inner cylinder is inserted into the outer cylinder is indicated by a white arrow. The ninth device 109 illustrated in FIG. 12 has the same configuration as the eighth device 108 illustrated in FIG. 11 except for the points listed below. As is clear from the configuration shown below, the ninth device 109 illustrated in FIG. 12 corresponds to the ninth device according to the above-described modified example 9-2.

(1) The inner cylinder 20 extends over the entire circumference toward the outside in the radial direction at the end of the first inner cylinder, which is the end of the inner cylinder 20 on the end side of the first outer cylinder in the axial direction of the inner cylinder 20. The inner cylinder flange 22 which is a projecting portion is provided. As described above, the first outer cylinder end is the end of the outer cylinder 30 on the side where the inner cylinder 20 is inserted into the outer cylinder 30 when the inner cylinder 20 is included in the outer cylinder 30.
(2) The outer cylinder 30 includes an outer cylinder flange 32 which is a portion of the end portion of the first outer cylinder that protrudes outward in the radial direction over the entire circumference.
(3) By bringing the inner cylinder flange 22 and the outer cylinder flange 32 into contact with each other and fastening them with the fastening member 50 including the bolt 51 and the nut 52, the inner cylinder 20 becomes the outer cylinder 30 at the end of the first outer cylinder. Detachable and fixed,
(4) The inner cylinder protruding portion 21 is arranged at a position farther from the end portion of the first outer cylinder than the center in the axial direction of the inner cylinder 20 (indicated by the alternate long and short dash line CI in FIG. 12). ..

<effect>
As described above, in the ninth device, the inner cylinder is outside at the end of the first outer cylinder, which is the end of the outer cylinder on the side where the inner cylinder is inserted into the outer cylinder when the inner cylinder is included in the outer cylinder. It is detachably fixed to the cylinder. Therefore, according to the ninth device, the inner cylinder containing the exhaust purification unit such as the DPF can be easily attached to and detached from the end of the first outer cylinder of the outer cylinder.

Further, in the ninth device, the inner cylinder flange is provided by the inner cylinder, the outer cylinder flange is provided by the outer cylinder, and the inner cylinder flange and the outer cylinder flange are brought into contact with each other and fastened to the end of the first inner cylinder. The inner cylinder may be fixed to the outer cylinder in the portion. According to such a configuration, the inner cylinder containing the exhaust purification unit such as a DPF can be more easily attached to and detached from the end of the first outer cylinder of the outer cylinder.

Further, in the ninth device, the inner cylinder protruding portion may be arranged at a position farther from the end portion of the first outer cylinder than the center in the axial direction of the inner cylinder. According to such a configuration, the inner cylinder and the outer cylinder are fixed at the first outer cylinder end portion and the inner cylinder protruding portion arranged at a position sufficiently separated from the first outer cylinder end portion. As a result, for example, due to an assembly error and a dimensional error of the inner cylinder and the outer cylinder, the position of the inner cylinder inside the outer cylinder is expected at the end opposite to the end of the first outer cylinder of the inner cylinder. It is possible to reduce the possibility of deviation from the position.

<supplement>
By the way, on the upstream side and / or downstream side of the exhaust gas purification device (device of the present invention) according to the present invention including the above-mentioned first to ninth devices, for example, other exhaust gas purification devices, silencers, etc. Equipment may be arranged. In this case, for example, an exhaust path such as a pipe for circulating exhaust gas between the device of the present invention and another device is provided on the upstream side and / or the downstream side of the device of the present invention. Even when such an exhaust path is connected to the end of the first outer cylinder described above, it is preferable that the inner cylinder containing the exhaust purification unit can be easily attached and detached.

13 to 15 are schematic cross-sectional views showing some examples of the configuration of the ninth device in which the exhaust path as described above is connected to the end of the first outer cylinder. In FIGS. 13 to 15, only the exhaust path connected to the inner cylinder, the outer cylinder, and the end of the first outer cylinder of the outer cylinder is simplified and drawn, and the inner cylinder protrusion, the outer cylinder protrusion, and the like are drawn in a simplified manner. Other components constituting the ninth device, such as the above, are omitted. Further, for the purpose of making it easy to understand the arrangement of the inner cylinder, the outer cylinder, and the members constituting the exhaust path, it is drawn as if there is a gap between the inner cylinder, the outer cylinder, and the members constituting the exhaust path. However, in reality, the inner cylinder, the outer cylinder, and the members constituting the exhaust path are airtightly joined.

First, in the example shown in FIG. 13, similarly to the ninth device 109 illustrated in FIG. 12, the inner cylinder flange 22 and the outer cylinder flange 32 are brought into contact with each other and fastened by a fastening member (not shown). The inner cylinder 20 is fixed to the outer cylinder 30 at the end of the first outer cylinder. In addition, in the example shown in FIG. 13, the flange 62 included in the pipe 61 is also fastened together with the inner cylinder flange 22 and the outer cylinder flange 32. As a result, the pipe 61 as an exhaust path for circulating exhaust gas to and from other devices (not shown) is airtightly joined to the ninth device.

In the above case, the inner cylinder 20 can be removed from the outer cylinder 30 by loosening the fastening member that fastens the inner cylinder flange 22 and the outer cylinder flange 32 and the flange 62 together. On the other hand, the inner cylinder 20 is attached to the outer cylinder 30 by inserting the inner cylinder 20 into the outer cylinder 30, bringing the inner cylinder flange 22, the outer cylinder flange 32, and the flange 62 into contact with each other and tightening them together with a fastening member. be able to.

Next, in the example shown in FIG. 14, the ninth device is housed inside the casing 70, and the outer cylinder 30 is placed on the peripheral edge of the through hole 71 formed in the peripheral wall of the casing 70 by a method such as welding. It is airtightly fixed. Further, the inner cylinder flange 22 and the outer cylinder flange 32 are co-tightened by a fastening member (not shown) to be airtightly fixed. On the other hand, the pipe 61 is airtightly fixed to the peripheral edge of the other through hole 72 formed in the peripheral wall of the casing 70 by, for example, welding or the like. A chamber 64 as an reversing chamber is defined outside the casing 70 by a peripheral wall member 63 arranged so as to cover these two through holes 71 and 72 and an outer peripheral wall of the casing 70 (hatched portion is defined as an oblique line). reference). As a result, the inner cylinder 20 and the pipe 61 communicate with each other via the chamber 64, and an exhaust path for circulating exhaust gas between another device (not shown) and the ninth device is configured.

In the above case, the inner cylinder 20 can be removed from the outer cylinder 30 by removing the peripheral wall member 63 from the casing 70 and loosening the fastening member that fastens the inner cylinder flange 22 and the outer cylinder flange 32 together. On the other hand, the inner cylinder 20 is inserted into the outer cylinder 30, the inner cylinder flange 22 and the outer cylinder flange 32 are brought into contact with each other and fastened together by a fastening member, and the peripheral wall member 63 is airtightly fixed to the casing 70. The inner cylinder 20 can be attached to the outer cylinder 30.

As described above, in the example shown in FIG. 14, the chamber 64 as the reversing chamber is defined by the peripheral wall member 63 attached to the outside of the casing 70 and the outer peripheral wall of the casing 70. On the other hand, in the example shown in FIG. 15, the chamber 64 as an inversion chamber is defined inside the casing 70 by the peripheral wall member 63 attached to the inside of the casing 70 and the inner peripheral wall of the casing 70 (see the shaded area). ). The outer cylinder 30 is airtightly fixed to the peripheral portion of the through hole 65 formed in the peripheral wall member 63 of the chamber 64 and the through hole 71 formed in the peripheral wall of the casing 70 by, for example, welding. Further, the inner cylinder flange 22, the lid member 24, and the outer cylinder flange 32 are jointly fastened by a fastening member (not shown) to be airtightly fixed. On the other hand, the pipe 61 is airtightly fixed to the peripheral edge of the other through hole 66 formed in the peripheral wall member 63 by, for example, welding or the like. In addition, communication holes 23 and 33, which are one or more through holes, are formed in the portions of the inner cylinder 20 and the peripheral wall of the outer cylinder 30 located in the chamber 64, respectively, through the communication holes 23 and 33, respectively. The inside of the inner cylinder 20 and the inside of the chamber 64 are communicated with each other. As a result, an exhaust path for circulating exhaust gas between another device (not shown) and the ninth device is configured.

In the above case, the inner cylinder 20 is removed from the outer cylinder 30 by loosening the fastening member that fastens the inner cylinder flange 22, the lid member 24, and the outer cylinder flange 32 together without removing the peripheral wall member 63 from the casing 70. It can be easily removed. On the other hand, by inserting the inner cylinder 20 into the outer cylinder 30, bringing the inner cylinder flange 22, the lid member 24, and the outer cylinder flange 32 into contact with each other and tightening them together with the fastening member, the inner cylinder 20 becomes the outer cylinder 30. Can be easily installed.

<< 10th Embodiment >>
Hereinafter, a method for manufacturing an exhaust gas purification device (hereinafter, may be referred to as a “tenth method”) will be described in the tenth embodiment of the present invention.

As mentioned at the beginning of this specification, the present invention includes not only an exhaust purification device having a cartridge structure that can be easily manufactured and that can surely achieve airtightness, but also such an exhaust. It is also related to the manufacturing method of the purification device.

<Constitution>
Therefore, the tenth method is a method for manufacturing an exhaust gas purification device (first device) according to the first embodiment of the present invention. As described above, the first device is an exhaust gas purification device including an exhaust gas purification unit, an inner cylinder, an outer cylinder, and a sealing member. The exhaust purification unit purifies the exhaust gas discharged from the internal combustion engine. The inner cylinder is a tubular member that includes an exhaust gas purification unit. The outer cylinder is a tubular member that includes the inner cylinder. The sealing member is a member having an annular shape and being held by sandwiching pressure between the inner cylinder and the outer cylinder to seal between the inner cylinder and the outer cylinder.

The outer cylinder includes an outer cylinder protruding portion which is a portion configured to project from the inner peripheral surface of the outer cylinder inward in the radial direction over the entire circumference at a predetermined position. On the other hand, the inner cylinder is configured to project from the outer peripheral surface of the inner cylinder toward the outside in the radial direction over the entire circumference at a position separated from the outer cylinder protrusion in the exhaust flow direction by a predetermined distance. It is provided with an inner cylinder protruding portion, which is a portion of the pipe. Further, the sealing member is held by sandwiching pressure between the inner cylinder protruding portion and the outer cylinder protruding portion.

In the first device, the outer cylinder is composed of at least a first outer cylinder member and a second outer cylinder member. The first outer cylinder member and the second outer cylinder member are two separate tubular members that are adjacent to each other in the exhaust flow direction and are airtightly joined at a predetermined joint location. Further, either one or both of the first outer cylinder member and the second outer cylinder member is provided with the outer cylinder protrusion at the end closer to the joint portion.

Since the details of the configuration of the first device have already been described in the description of the first device, the description will not be repeated here.

As described above, the tenth method is a method for manufacturing the first device, which is a method for manufacturing the exhaust gas purification device including the first step to the third step listed below.
First step: A step of forming an outer cylinder protruding portion at an end closer to the above-mentioned joint portion of either one or both of the first outer cylinder member and the second outer cylinder member.
Second step: A step of airtightly joining the first outer cylinder member and the second outer cylinder member at the above-mentioned joint portion to assemble the outer cylinder.
Third step: The inner cylinder containing the exhaust purification unit is inserted into the inside of the outer cylinder from the end of the first outer cylinder, which is one end of the outer cylinder, and is between the protrusion of the inner cylinder and the protrusion of the outer cylinder. A process of holding the sealing member under pressure.

As a specific method for joining the first outer cylinder member and the second outer cylinder member in the first step, as described above, the first outer cylinder member and the second outer cylinder member are airtightly joined together. It is not particularly limited as long as it can withstand the usage environment and usage conditions as an exhaust gas purification device. Specific examples of such a method include welding and the like.

Further, as described above, the dimensions of the sealing member in the axial direction of the outer cylinder and / or the inner cylinder in the state where the pressure is not held between the inner cylinder protrusion and the outer cylinder protrusion are determined by the first device. It is larger than the axial distance between the inner cylinder protrusion and the outer cylinder protrusion in the assembled state. Therefore, when the inner cylinder is inserted into the outer cylinder from the first outer cylinder end portion, which is one end portion of the outer cylinder in the second step, the inner cylinder is sealed between the inner cylinder protruding portion and the outer cylinder protruding portion. The member is compressed. As a result, due to the restoring force of the sealing member as a repulsion against the compression, the inner cylinder protruding portion and the outer cylinder protruding portion and the sealing member are brought into close contact with each other, and the space between the inner cylinder and the outer cylinder is sealed.

FIG. 16 is a flowchart showing an example of the flow of processing executed in the tenth method. In the flowchart illustrated in FIG. 16, steps other than the above-mentioned first step to third step are also included. In the example shown in FIG. 16, first, in step S01, the exhaust purification unit (for example, DPF or the like) is housed inside the inner cylinder and fixed at a predetermined position. Next, in step S02, an inner cylinder protruding portion is formed at a predetermined position on the outer peripheral surface of the inner cylinder. Next, in step S03, an outer cylinder protruding portion is formed at an end portion closer to the above-mentioned joint portion of either one or both of the first outer cylinder member and the second outer cylinder member. This step S03 corresponds to the first step described above.

Next, in step S04, the first outer cylinder member and the second outer cylinder member are airtightly joined at the above-mentioned joint portion, and the outer cylinder is assembled. This step S04 corresponds to the second step described above. Further, in step S05, the inner cylinder containing the exhaust purification unit is inserted into the inside of the outer cylinder from the end of the first outer cylinder, which is one end of the outer cylinder, and the inner cylinder protruding portion and the outer cylinder protruding portion are connected to each other. A sealing member is held in between. This step S05 corresponds to the third step described above. The execution order of steps S01 to S03 described above does not necessarily have to be the same as described above. Depending on the configuration, the execution order of these steps can be changed as appropriate.

<effect>
As described above, in the tenth method, the inner peripheral surface is formed by airtightly joining the first outer cylinder member and the second outer cylinder member, each of which is provided with the outer cylinder protruding portion in advance, at the joint portion. An outer cylinder having an outer cylinder protrusion at a predetermined position can be easily assembled. Further, due to the restoring force of the sealing member as a repulsion against the compression by the inner cylinder protruding portion and the outer cylinder protruding portion, the inner cylinder protruding portion and the outer cylinder protruding portion and the sealing member are brought into close contact with each other, and the inner cylinder and the outer cylinder are brought into close contact with each other. The space is sealed. That is, according to the tenth method, it is possible to easily manufacture an exhaust gas purification device having a cartridge structure capable of reliably achieving airtightness.

<< 11th Embodiment >>
Hereinafter, a method for manufacturing an exhaust gas purification device (hereinafter, may be referred to as “11th method”) will be described in the eleventh embodiment of the present invention.

<Constitution>
The eleventh method is the tenth method described above, and is a method for manufacturing an exhaust gas purification device in which only one of the first outer cylinder member and the second outer cylinder member, the third outer cylinder member, has an outer cylinder protrusion. Is. That is, the eleventh method is a method for manufacturing an exhaust gas purification device (second device) according to the second embodiment of the present invention. Since the details of the configuration of the second device have already been described in the description of the second device, the description will not be repeated here.

<effect>
As described above, in the second device, the outer cylinder protruding portion is provided at the end of only one of the first outer cylinder member and the second outer cylinder member. Therefore, according to the eleventh method, which is a manufacturing method of the second device, it is possible to simplify the members constituting the outer cylinder and reduce problems such as complicated manufacturing process of the outer cylinder and increase in manufacturing cost.

<< 12th Embodiment >>
Hereinafter, a method for manufacturing an exhaust gas purification device (hereinafter, may be referred to as a “twelfth method”) will be described in the twelfth embodiment of the present invention.

<Constitution>
The twelfth method is the eleventh method described above, and the fourth outer cylinder member, which is the other of the first outer cylinder member and the second outer cylinder member and is not the third outer cylinder member, is connected to the third outer cylinder member at the above-mentioned joint portion. It is a method of manufacturing an exhaust gas purification device, which includes fitting the outer cylinder member to the outside. That is, the twelfth method is a method for manufacturing an exhaust gas purification device (third device) according to the third embodiment of the present invention. Since the details of the configuration of the third device have already been described in the description of the third device, the description will not be repeated here.

In addition, in the step of outerly fitting the fourth outer cylinder member to the third outer cylinder member in the twelfth method, the first outer cylinder member and the second outer cylinder member are airtightly formed at the above-mentioned joint portion in the above-mentioned second step. It is executed in the process of joining and assembling the outer cylinder.

<effect>
As described above, in the third device, only the third outer cylinder member, which is one of the first outer cylinder member and the second outer cylinder member constituting the outer cylinder, is provided with the outer cylinder protruding portion, and the third device In the twelfth method, which is a manufacturing method, the fourth outer cylinder member, which is the other of the first outer cylinder member and the second outer cylinder member, which is not the third outer cylinder member, is outerly fitted to the third outer cylinder member at the joint. NS. As a result, according to the twelfth method, the first outer cylinder member and the second outer cylinder member can be easily joined, and the airtightness of the outer cylinder can be improved.

<< 13th Embodiment >>
Hereinafter, a method for manufacturing an exhaust gas purification device (hereinafter, may be referred to as a “13th method”) will be described in the thirteenth embodiment of the present invention.

<Constitution>
The thirteenth method is any one of the tenth to twelfth methods described above, and one or both of the first outer cylinder member and the second outer cylinder member and the outer cylinder protruding portion are integrally formed. It is a method of manufacturing an exhaust gas purification device including the above. That is, the thirteenth method is a method for manufacturing an exhaust gas purification device (fourth device) according to the fourth embodiment of the present invention. Since the details of the configuration of the fourth device have already been described in the description of the fourth device, the description will not be repeated here.

In the thirteenth method, the step of integrally forming one or both of the first outer cylinder member and the second outer cylinder member and the outer cylinder protruding portion is the first outer cylinder member and the first outer cylinder member and the step of integrally forming the outer cylinder protrusion. This is performed in the process of forming the outer cylinder protrusion at the end closer to the joint of either one or both of the second outer cylinder members.

<effect>
As described above, in the fourth device, the outer cylinder protruding portion is formed integrally with either one or both of the first outer cylinder member and the second outer cylinder member. Therefore, according to the thirteenth method, which is a manufacturing method of the fourth apparatus, problems such as complicated manufacturing process of the outer cylinder and increase in manufacturing cost are reduced by simplifying the configuration of the outer cylinder and reducing the number of parts. be able to.

<< 14th Embodiment >>
Hereinafter, a method for manufacturing an exhaust gas purification device (hereinafter, may be referred to as a “14th method”) will be described in the 14th embodiment of the present invention.

<Constitution>
The 14th method is any of the 10th to 13th methods described above, and is configured such that the surface of the outer cylinder protruding portion in contact with the sealing member is perpendicular to the axial direction of the outer cylinder. This is a method of manufacturing an exhaust gas purification device. That is, the 14th method is a method for manufacturing an exhaust gas purification device (fifth device) according to the fifth embodiment of the present invention. Since the details of the configuration of the fifth device have already been described in the description of the fifth device, the description will not be repeated here.

<effect>
As described above, in the fifth device, the surface of the outer cylinder protruding portion in contact with the sealing member is a surface perpendicular to the axial direction of the outer cylinder. Therefore, according to the 14th method, which is a manufacturing method of the 5th apparatus, the position of the end portion of the sealing member held by being sandwiched between the inner cylinder protruding portion and the outer cylinder protruding portion on the outer cylinder protruding portion side is determined. It can be securely fixed, and the end portion of the sealing member on the protruding portion side of the outer cylinder can be uniformly compressed so that the restoring force as a repulsion against the compression can be uniformly applied. Further, for example, when the outer cylinder protruding portion is formed of a plate-shaped member such as a baffle, the structure of the member is simplified to reduce problems such as complication of the manufacturing process of the member and an increase in manufacturing cost. be able to.

<< 15th Embodiment >>
Hereinafter, a method for manufacturing an exhaust gas purification device (hereinafter, may be referred to as a “15th method”) will be described in the 15th embodiment of the present invention.

<Constitution>
The fifteenth method is any one of the tenth to thirteenth methods described above, and when the surface of the outer cylinder protruding portion in contact with the sealing member encloses the inner cylinder in the outer cylinder, the inner cylinder becomes the outer cylinder. This is a method for manufacturing an exhaust gas purification device, which is configured to have a tapered shape in which the inner diameter gradually decreases toward the first direction, which is the direction of insertion into the inside. That is, the fifteenth method is a method for manufacturing an exhaust gas purification device (sixth device) according to the sixth embodiment of the present invention. Since the details of the configuration of the sixth device have already been described in the description of the sixth device, the description will not be repeated here.

<effect>
As described above, in the sixth device, the surface of the outer cylinder protruding portion in contact with the sealing member is configured to have a tapered shape in which the inner diameter gradually decreases as it advances toward the first direction. There is. Therefore, when the inner cylinder is inserted into the outer cylinder in the third step included in the fifteenth method which is the manufacturing method of the sixth apparatus, the end portion of the sealing member on the outer cylinder protruding portion side is the outer cylinder protruding portion. Contact the tapered surface of. Since this surface is configured so that the inner diameter gradually decreases as it advances toward the first direction as described above, the shaft of the inner cylinder becomes the shaft of the outer cylinder as the inner cylinder is inserted inside the outer cylinder. The inner cylinder is urged via the sealing member so as to approach. This makes it possible to reduce the problem that the position of the inner cylinder in the radial direction of the outer cylinder deviates from a predetermined position based on the design due to, for example, an assembly error and a dimensional error of the inner cylinder and the outer cylinder.

<< 16th Embodiment >>
Hereinafter, a method for manufacturing an exhaust gas purification device (hereinafter, may be referred to as a “16th method”) will be described in the 16th embodiment of the present invention.

<Constitution>
The 16th method is any of the 10th to 15th methods described above, and is configured such that the surface of the inner cylinder protruding portion in contact with the sealing member is perpendicular to the axial direction of the inner cylinder. This is a method of manufacturing an exhaust gas purification device. That is, the 16th method is a method for manufacturing an exhaust gas purification device (7th device) according to the 7th embodiment of the present invention. Since the details of the configuration of the seventh device have already been described in the description of the seventh device, the description will not be repeated here.

<effect>
As described above, in the seventh apparatus, the surface of the inner cylinder protruding portion in contact with the sealing member is a surface perpendicular to the axial direction of the inner cylinder. Therefore, according to the 16th method, which is a manufacturing method of the 7th apparatus, the position of the end portion of the sealing member held by being sandwiched between the inner cylinder protruding portion and the outer cylinder protruding portion on the inner cylinder protruding portion side is determined. It can be securely fixed, and the end portion of the sealing member on the inner cylinder protruding portion side can be uniformly compressed so that the restoring force as a repulsion against the compression can be uniformly applied. Further, for example, when the inner cylinder protruding portion is formed of a plate-shaped member such as a baffle, the structure of the member is simplified to reduce problems such as complication of the manufacturing process of the member and an increase in manufacturing cost. be able to.

<< 17th Embodiment >>
Hereinafter, a method for manufacturing an exhaust gas purification device (hereinafter, may be referred to as a “17th method”) will be described in the 17th embodiment of the present invention.

<Constitution>
The 17th method is any of the 10th to 15th methods described above, and when the surface of the inner cylinder protruding portion in contact with the sealing member encloses the inner cylinder in the outer cylinder, the inner cylinder becomes the outer cylinder. This is a method for manufacturing an exhaust gas purification device, which is configured to have a tapered shape in which the outer diameter gradually decreases toward the first direction, which is the direction in which the exhaust gas is inserted into the inside. That is, the 17th method is a method for manufacturing an exhaust gas purification device (8th device) according to the 8th embodiment of the present invention. Since the details of the configuration of the eighth device have already been described in the description of the eighth device, the description will not be repeated here.

<effect>
As described above, in the eighth device, the surface of the inner cylinder protruding portion in contact with the sealing member is configured to have a tapered shape in which the outer diameter gradually decreases as it advances toward the first direction. ing. Therefore, when the inner cylinder is inserted into the outer cylinder in the third step included in the 17th method which is the manufacturing method of the eighth apparatus, the end portion of the sealing member on the inner cylinder protruding portion side is the inner cylinder protruding portion. Contact the tapered surface of. Since this surface is configured so that the outer diameter gradually decreases as it advances toward the first direction as described above, the shaft of the inner cylinder becomes the outer cylinder as the inner cylinder is inserted inside the outer cylinder. The inner cylinder is urged via the sealing member so as to approach the shaft. This makes it possible to reduce the problem that the position of the inner cylinder in the radial direction of the outer cylinder deviates from a predetermined position based on the design due to, for example, an assembly error and a dimensional error of the inner cylinder and the outer cylinder.

<< 18th Embodiment >>
Hereinafter, a method for manufacturing an exhaust gas purification device (hereinafter, may be referred to as “18th method”) will be described in the 18th embodiment of the present invention.

<Constitution>
The eighteenth method is any one of the tenth to seventeenth methods described above, and the method for manufacturing an exhaust gas purification device includes the attachment and detachment of the inner cylinder to the outer cylinder at the end of the first outer cylinder. Is. That is, the 18th method is a method for manufacturing an exhaust gas purification device (9th device) according to the 9th embodiment of the present invention. Since the details of the configuration of the ninth device have already been described in the description of the ninth device, the description will not be repeated here.

The ninth device manufactured by the eighteenth method may be the ninth device according to the above-described modification 9-1. That is, in the ninth apparatus manufactured by the eighteenth method, the end portion of the first inner cylinder, which is the end portion of the inner cylinder on the end portion side of the first outer cylinder in the axial direction of the inner cylinder, is directed outward in the radial direction. The inner cylinder is provided with an inner cylinder flange which is a portion protruding over the entire circumference, and an outer cylinder flange which is a portion protruding outward in the radial direction at the end of the first outer cylinder. May be provided by the outer cylinder. In this case, the inner cylinder can be fixed to the outer cylinder by bringing the inner cylinder flange and the outer cylinder flange into contact with each other and fastening them.

Further, the ninth device manufactured by the eighteenth method may be the ninth device according to the above-described modification 9-2. That is, in the ninth apparatus manufactured by the eighteenth method, the inner cylinder protruding portion may be arranged at a position farther from the end portion of the first outer cylinder than the center in the axial direction of the inner cylinder.

<effect>
As described above, in the ninth device, the inner cylinder is outside at the end of the first outer cylinder, which is the end of the outer cylinder on the side where the inner cylinder is inserted into the outer cylinder when the inner cylinder is included in the outer cylinder. It is detachably fixed to the cylinder. Therefore, according to the eighteenth method, which is a manufacturing method of the ninth apparatus, for example, an exhaust gas in which an exhaust purification unit such as a DPF is housed can be easily attached to and detached from the end of the first outer cylinder of the outer cylinder. Purification equipment can be provided.

Further, in the ninth device, the inner cylinder flange is provided by the inner cylinder, the outer cylinder flange is provided by the outer cylinder, and the inner cylinder flange and the outer cylinder flange are brought into contact with each other and fastened to the end of the first inner cylinder. The inner cylinder may be fixed to the outer cylinder in the portion. Therefore, according to the eighteenth method, which is a method of manufacturing the ninth apparatus having such a configuration, for example, an inner cylinder containing an exhaust purification unit such as a DPF is placed at the end of the first outer cylinder of the outer cylinder. It is possible to provide an exhaust purification device that can be more easily attached and detached.

Further, in the ninth device, the inner cylinder protruding portion may be arranged at a position farther from the end portion of the first outer cylinder than the center in the axial direction of the inner cylinder. Therefore, according to the eighteenth method, which is a method of manufacturing the ninth apparatus having such a configuration, the inner cylinder protrusions arranged at positions sufficiently separated from the first outer cylinder end portion and the first outer cylinder end portion. The inner cylinder and the outer cylinder are fixed to each other. As a result, for example, due to an assembly error and a dimensional error of the inner cylinder and the outer cylinder, the position of the inner cylinder inside the outer cylinder is expected at the end opposite to the end of the first outer cylinder of the inner cylinder. It is possible to reduce the possibility of deviation from the position.

The exhaust gas purification device according to the embodiment of the present invention (hereinafter, may be referred to as “example device”) will be described in detail below with reference to the drawings.

<Constitution>
FIG. 17 is a schematic cross-sectional view showing the components of the apparatus of the embodiment. That is, FIG. 17 shows a state before the embodiment devices are assembled. FIG. 18 is a schematic cross-sectional view showing the configuration of the embodiment device after assembly. More specifically, FIG. 18 is a schematic cross-sectional view of the embodiment device in a plane including a common axis of the inner cylinder and the outer cylinder. FIG. 19 is an enlarged view of a portion surrounded by a broken line in FIG. The white arrows shown in FIGS. 17 and 18 represent the first direction in which the inner cylinder is inserted into the outer cylinder when the inner cylinder is included in the outer cylinder in the process of assembling the apparatus of the embodiment. On the other hand, the black arrows indicate the flow direction of the exhaust gas in the apparatus of the embodiment.

Further, FIG. 20 is a schematic perspective view showing an example of the configuration of the inner cylinder 20 included in the embodiment device 201. Further, FIG. 21 is a schematic partial decomposition perspective view showing an example of the configuration of a portion in which the inner cylinder 20 is inserted into the outer cylinder 30 in the embodiment device 201. As illustrated in FIG. 21, the embodiment device 201 is housed inside a casing 70. Further, the white arrows shown in FIG. 21 also indicate the first direction in which the inner cylinder is inserted into the outer cylinder when the inner cylinder is included in the outer cylinder in the assembling process of the apparatus of the embodiment.

As shown in FIGS. 17 to 19, the embodiment device 201 is an exhaust gas purification device including an exhaust gas purification unit 10, an inner cylinder 20, an outer cylinder 30, and a sealing member 40. The exhaust gas purification unit 10 purifies the exhaust gas discharged from an internal combustion engine (not shown). The exhaust purification unit 10 included in the device 201 is a diesel particulate filter (DPF). The inner cylinder 20 is a tubular member that includes the exhaust gas purification unit 10. A holding member (mat) 11 is held by sandwiching pressure between the exhaust gas purification unit 10 and the inner cylinder 20, and the exhaust gas purification unit 10 is held at a predetermined position inside the inner cylinder 20 by the restoring force of the holding member 11. And fixed. The outer cylinder 30 is a tubular member that includes the inner cylinder 20. The sealing member 40 is a member having an annular shape and being held by sandwiching pressure between the inner cylinder 20 and the outer cylinder 30 to seal between the inner cylinder 20 and the outer cylinder 30.

The inner cylinder 20 includes an inner cylinder protruding portion 21 which is a portion configured to project from the outer peripheral surface of the inner cylinder 20 toward the outside in the radial direction over the entire circumference at a predetermined position. On the other hand, the outer cylinder 30 includes an outer cylinder protruding portion 31 which is a portion configured to project from the inner peripheral surface of the outer cylinder 30 inward in the radial direction over the entire circumference at a predetermined position. In the state where the apparatus 201 of the embodiment is assembled, the inner cylinder protruding portion 21 and the outer cylinder protruding portion 31 are arranged so as to be separated from each other by a predetermined distance in the exhaust flow direction. As a result, when the inner cylinder 20 is inserted into the outer cylinder 30 at the time of assembling the embodiment device 201, the sealing member 40 holds the sandwiching pressure between the inner cylinder protruding portion 21 and the outer cylinder protruding portion 31. Will be done.

In the apparatus 201 of the embodiment, the outer cylinder 30 is composed of at least the first outer cylinder member 30a and the second outer cylinder member 30b. The first outer cylinder member 30a and the second outer cylinder member 30b are adjacent to each other in the exhaust flow direction, and the first outer cylinder member 30a is fitted onto the second outer cylinder member 30b at a predetermined joint location and airtightly joined by welding. Has been done. The first outer cylinder member 30a does not have an outer cylinder protruding portion 31, and only the second outer cylinder member 30b has an outer cylinder at an end closer to the joint portion between the first outer cylinder member 30a and the second outer cylinder member 30b. A protrusion 31 (31b) is provided. That is, the first outer cylinder member 30a corresponds to the above-mentioned fourth outer cylinder member, and the second outer cylinder member corresponds to the above-mentioned third outer cylinder member.

The inner cylinder protruding portion 21 is formed of a collar-shaped member separate from the inner cylinder 20, and is projected from the outer peripheral surface of the inner cylinder 20 by welding. Therefore, the surface of the inner cylinder protruding portion 21 in contact with the sealing member 40 is a surface perpendicular to the direction of the axis AX of the inner cylinder 20 (parallel to the radial direction of the inner cylinder 20). On the other hand, the outer cylinder protruding portion 31 (31b) is integrally formed with the second outer cylinder member 30b. The surface of the outer cylinder protruding portion 31 in contact with the sealing member 40 is configured to have a tapered shape in which the inner diameter gradually decreases as it advances toward the first direction. As described above, the first direction means the direction in which the inner cylinder 20 is inserted into the outer cylinder 30 when the inner cylinder 20 is included in the outer cylinder 30. Such an outer cylinder protruding portion 31 can be formed by applying a spinning process to the upstream end portion of the second outer cylinder member 30b.

Further, the inner cylinder 20 is radially outward at the end of the first inner cylinder 20 which is the end of the inner cylinder 20 on the end side of the first outer cylinder (downstream side in the embodiment device 201) in the direction of the axis AX. An inner cylinder flange 22 which is a portion projecting over the entire circumference thereof is provided. On the other hand, the outer cylinder 30 includes an outer cylinder flange 32 which is a portion of the end portion of the first outer cylinder that protrudes outward in the radial direction over the entire circumference. Then, the inner cylinder flange 22, the outer cylinder flange 32, and the lid member 24 are brought into contact with each other, and the first outer cylinder is fastened by a fastening member 50 including a bolt 51, a nut 52, a washer 53, a gasket 54, and the like. At the end, the inner cylinder 20 is detachably fixed to the outer cylinder 30.

As described above, in the embodiment device 201, the end portion of the first outer cylinder of the outer cylinder 30 is closed by the lid member 24, but as shown in FIGS. 17, 18, 20, and 21, the inside is inside. Since the communication hole 23, which is one or more through holes, is formed in the peripheral wall of the cylinder 20, the communication holes 23 are provided inside the inner cylinder 20 and on the downstream side of the embodiment device 201 via the communication holes 23 and 33. Exhaust gas can be circulated to and from the device (not shown). The inner cylinder protruding portion 21 is arranged at a position farther from the end of the first outer cylinder than the center of the inner cylinder 20 in the direction of the axis AX. That is, the inner cylinder 20 and the outer cylinder 30 are fixed at the first outer cylinder end portion and the inner cylinder protruding portion 21 arranged at a position sufficiently separated from the first outer cylinder end portion.

By the way, on the upstream side of the embodiment device 201, an exhaust gas purification device provided with a diesel oxidation catalyst (DOC80) is provided adjacently as another exhaust gas purification device. Specifically, the upstream end of the first outer cylinder member 30a of the embodiment device 201 is externally fitted to the tubular case 90 containing the DOC 80 as an exhaust purification unit, and is airtightly joined by welding. There is. As a result, hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOx) and the like contained in the exhaust gas can be oxidized on the upstream side of the Example apparatus 201. A holding member (mat) 81 is held by sandwiching between the DOC 80 and the case 90, and the DOC 80 is held and fixed at a predetermined position inside the case 90 by the restoring force of the holding member 81.

<effect>
As described above, in the embodiment device 201, the first outer cylinder is two separate tubular members that are adjacent to each other in the exhaust flow direction (black arrows) and are airtightly joined at a predetermined joint location. The outer cylinder 30 is composed of the member 30a and the second outer cylinder member 30b. Further, the second outer cylinder member 30b is provided with an outer cylinder protruding portion 31 (31b) at an end portion closer to the joint portion. Therefore, unlike the outer cylinder provided in the conventional device described above, the step of fixing the outer cylinder protruding portion deeply in the inner peripheral surface is not required, and the second outer cylinder member 30b and the first outer cylinder member 30b having the outer cylinder protruding portion 31 in advance are not required. By airtightly joining the outer cylinder member 30a at the joint portion, the outer cylinder 30 having the outer cylinder protruding portion 31 at a predetermined position on the inner peripheral surface can be easily assembled.

Further, in the embodiment device 201, as described above, the inner cylinder protruding portion 21 and the outer cylinder protruding portion 21 and the outer cylinder protruding portion are due to the restoring force of the sealing member 40 as a repulsion against the compression by the inner cylinder protruding portion 21 and the outer cylinder protruding portion 31. 31 and the sealing member 40 are in close contact with each other, and the space between the inner cylinder 20 and the outer cylinder 30 is sealed. That is, in the process of assembling the device 201, the sealing member 40 is compressed and deformed between the inner cylinder protruding portion 21 and the outer cylinder protruding portion 31 to hold the pinching pressure. Therefore, even if the distance between the inner cylinder protruding portion 21 and the outer cylinder protruding portion 31 in the exhaust flow direction deviates from the design value due to, for example, an assembly error and a dimensional error of the inner cylinder 20 and the outer cylinder 30. By increasing or decreasing the amount of deformation of the sealing member 40, the sealing between the inner cylinder 20 and the outer cylinder 30 can be reliably maintained. That is, according to the embodiment 201, it is possible to provide an exhaust gas purification device having a cartridge structure that can be easily manufactured and that can surely achieve airtightness.

Further, since the outer cylinder protruding portion 31 (31b) is integrally provided at the end of only the second outer cylinder member 30b of the first outer cylinder member 30a and the second outer cylinder member 30b, for example, the outer cylinder By simplifying the configuration of 30 and reducing the number of parts, problems such as complicated manufacturing process of the outer cylinder 30 and increase in manufacturing cost can be reduced. Further, only the second outer cylinder member 30b as the third outer cylinder member is provided with the outer cylinder protruding portion 31, and the first outer cylinder member 30a as the fourth outer cylinder member is the second outer cylinder member 30b (the second outer cylinder member 30b) at the joint. Since it is fitted onto the outer cylinder member (3), the first outer cylinder member 30a and the second outer cylinder member 30b can be easily joined and the airtightness can be improved.

In addition, the surface of the outer cylinder protruding portion 31 in contact with the sealing member 40 is configured to have a tapered shape in which the inner diameter gradually decreases as it advances toward the first direction. Therefore, when the inner cylinder 20 is inserted into the outer cylinder 30 in the assembling process of the apparatus 201, the end portion of the sealing member 40 on the outer cylinder protruding portion 31 side is tapered. The inner cylinder 20 is urged via the sealing member 40 so that the shaft of the inner cylinder 20 approaches the shaft of the outer cylinder 30 as the inner cylinder 20 is inserted into the outer cylinder 30 in contact with the surface. .. This can reduce the problem that the position of the inner cylinder 20 in the radial direction of the outer cylinder 30 deviates from a predetermined position based on the design due to, for example, an assembly error and a dimensional error of the inner cylinder 20 and the outer cylinder 30. can.

Further, in the embodiment device 201, the inner cylinder flange 22 is provided by the inner cylinder 20, the outer cylinder flange 32 is provided by the outer cylinder 30, and the inner cylinder flange 22 and the outer cylinder flange 32 are brought into contact with each other and fastened. As a result, the inner cylinder 20 is detachably fixed to the outer cylinder 30 at the end of the first inner cylinder. Therefore, the inner cylinder 20 in which the exhaust gas purification unit 10 is housed can be easily attached / detached at the end of the first outer cylinder of the outer cylinder 30.

In addition, in the embodiment device 201, the inner cylinder protruding portion 21 is arranged at a position farther from the end of the first outer cylinder than the center in the direction of the axis AX of the inner cylinder 20. Therefore, the inner cylinder 20 and the outer cylinder 30 are fixed at the first outer cylinder end portion and the inner cylinder protruding portion 21 arranged at a position sufficiently separated from the first outer cylinder end portion. As a result, for example, due to an assembly error and a dimensional error of the inner cylinder 20 and the outer cylinder 30, the inner cylinder 20 inside the outer cylinder 30 at the end opposite to the first outer cylinder end of the inner cylinder 20. It is possible to reduce the possibility that the position deviates from the intended position.

As described above, according to the apparatus 201 of the embodiment, the second outer cylinder member 30b and the first outer cylinder member 30a, which are provided with the integrally formed outer cylinder protruding portion 31 in advance, are airtightly joined at the joint portion. Therefore, the outer cylinder 30 having the outer cylinder protrusion 31 at a predetermined position on the inner peripheral surface can be easily assembled. Further, the inner cylinder 20 is fixed at a predetermined position inside the outer cylinder 30 and between the inner cylinder 20 and the outer cylinder 30 without excessively strictly controlling the dimensional accuracy of the inner cylinder 20 and the outer cylinder 30. Sealing can be reliably achieved. Further, the inner cylinder 20 containing the exhaust gas purification unit 10 can be easily attached / detached at the end of the first outer cylinder of the outer cylinder 30. That is, according to the embodiment 201, it is possible to provide an exhaust gas purification device having a cartridge structure that can be manufactured more easily and can surely achieve airtightness.

As described above, for the purpose of explaining the present invention, some embodiments and examples having a specific configuration have been described with reference to the accompanying drawings, but the scope of the present invention is exemplary of these. It should not be construed as being limited to the embodiments and examples, and it goes without saying that modifications can be made as appropriate within the scope of the claims and the matters described in the specification.

10 ... Exhaust purification unit (DPF), 11 ... Holding member (mat), 20 ... Inner cylinder, 21 ... Inner cylinder protrusion, 22 ... Inner cylinder flange, 23 ... Communication hole (inner cylinder), 24 ... Lid member, 30 ... outer cylinder, 30a ... first outer cylinder member, 30b ... second outer cylinder member, 31, 31a, 31b ... outer cylinder protrusion, 32 ... outer cylinder flange, 33 ... communication hole (outer cylinder), 40 ... sealing Member, 50 ... Fastening member, 51 ... Bolt, 52 ... Nut, 53 ... Washer, 54 ... Gasket, 61 ... Piping, 62 ... Flange (Piping), 63 ... Peripheral wall member, 64 ... Chamber, 65, 66 ... Through hole (Through hole) Chamber), 70 ... casing, 71,72 ... through holes (casing), 80 ... diesel oxidation catalyst (DOC), 81 ... holding member (mat), 90 ... case, 101,102,106,108,109,201 ... Exhaust purification device.

Claims (22)

An exhaust purification unit that purifies the exhaust gas discharged from the internal combustion engine, an inner cylinder that is a tubular member that includes the exhaust purification unit, and an outer cylinder that is a tubular member that includes the inner cylinder. A sealing member having a shape and being held by being held between the inner cylinder and the outer cylinder to seal between the inner cylinder and the outer cylinder is provided.
The outer cylinder includes an outer cylinder protruding portion which is a portion configured to project from the inner peripheral surface of the outer cylinder inward in the radial direction over the entire circumference at a predetermined position.
The inner cylinder protrudes from the outer peripheral surface of the inner cylinder toward the outside in the radial direction over the entire circumference at a position separated from the outer cylinder protruding portion in the exhaust flow direction by a predetermined distance. Equipped with an inner cylinder protrusion that is a configured part,
The sealing member is held under pressure between the inner cylinder protruding portion and the outer cylinder protruding portion.
Exhaust gas purification device
The outer cylinder is composed of at least a first outer cylinder member and a second outer cylinder member.
The first outer cylinder member and the second outer cylinder member are two separate tubular members that are adjacent to each other in the flow direction of the exhaust gas and are airtightly joined at a predetermined joint location.
One or both of the first outer cylinder member and the second outer cylinder member includes the outer cylinder protrusion at an end closer to the joint.
Exhaust purification device. The exhaust gas purification device according to claim 1.
Only the third outer cylinder member, which is one of the first outer cylinder member and the second outer cylinder member, includes the outer cylinder protruding portion.
Exhaust purification device. The exhaust gas purification device according to claim 2.
The fourth outer cylinder member, which is the other of the first outer cylinder member and the second outer cylinder member and is not the third outer cylinder member, is outerly fitted to the third outer cylinder member at the joint portion.
Exhaust purification device. The exhaust gas purification device according to any one of claims 1 to 3.
The outer cylinder protruding portion is a portion integrally formed with either one or both of the first outer cylinder member and the second outer cylinder member.
Exhaust purification device. The exhaust gas purification device according to any one of claims 1 to 4.
The surface of the outer cylinder protruding portion in contact with the sealing member is configured to be perpendicular to the axial direction of the outer cylinder.
Exhaust purification device. The exhaust gas purification device according to any one of claims 1 to 4.
The surface of the outer cylinder protruding portion in contact with the sealing member is directed toward a first direction in which the inner cylinder is inserted into the outer cylinder when the inner cylinder is included in the outer cylinder. It is configured to have a tapered shape in which the inner diameter gradually decreases as it progresses.
Exhaust purification device. The exhaust gas purification device according to any one of claims 1 to 6.
The surface of the inner cylinder protruding portion in contact with the sealing member is configured to be perpendicular to the axial direction of the inner cylinder.
Exhaust purification device. The exhaust gas purification device according to any one of claims 1 to 6.
The surface of the inner cylinder protruding portion in contact with the sealing member is directed toward a first direction in which the inner cylinder is inserted into the outer cylinder when the inner cylinder is included in the outer cylinder. It is configured to have a tapered shape in which the outer diameter gradually decreases as it progresses.
Exhaust purification device. The exhaust gas purification device according to any one of claims 1 to 8.
The inner cylinder is attached to and detached from the outer cylinder at the end of the first outer cylinder, which is the end of the outer cylinder on the side where the inner cylinder is inserted into the outer cylinder when the inner cylinder is included in the outer cylinder. Fixed as possible,
Exhaust purification device. The exhaust gas purification device according to claim 9.
The inner cylinder projects from the end of the inner cylinder, which is the end of the inner cylinder on the end side of the first outer cylinder in the axial direction of the inner cylinder, toward the outside in the radial direction over the entire circumference. Equipped with an inner cylinder flange that is a part that has been removed
The outer cylinder is provided with an outer cylinder flange which is a portion of the first outer cylinder end portion protruding outward in the radial direction over the entire circumference.
The inner cylinder is fixed to the outer cylinder by abutting and fastening the inner cylinder flange and the outer cylinder flange to each other.
Exhaust purification device. The exhaust gas purification device according to claim 9 or 10.
The inner cylinder protruding portion is arranged at a position farther from the end portion of the first outer cylinder than the center in the axial direction of the inner cylinder.
Exhaust purification device. An exhaust purification unit that purifies the exhaust gas discharged from the internal combustion engine, an inner cylinder that is a tubular member that includes the exhaust purification unit, and an outer cylinder that is a tubular member that includes the inner cylinder. A sealing member having a shape and being held by being held between the inner cylinder and the outer cylinder to seal between the inner cylinder and the outer cylinder is provided.
The outer cylinder includes an outer cylinder protruding portion which is a portion configured to project from the inner peripheral surface of the outer cylinder inward in the radial direction over the entire circumference at a predetermined position.
The inner cylinder protrudes from the outer peripheral surface of the inner cylinder toward the outside in the radial direction over the entire circumference at a position separated from the outer cylinder protruding portion in the exhaust flow direction by a predetermined distance. Equipped with an inner cylinder protrusion that is a configured part,
The sealing member is held by sandwiching pressure between the inner cylinder protruding portion and the outer cylinder protruding portion.
The outer cylinder is composed of at least a first outer cylinder member and a second outer cylinder member.
The first outer cylinder member and the second outer cylinder member are two separate tubular members that are adjacent to each other in the flow direction of the exhaust gas and are airtightly joined at a predetermined joint location.
One or both of the first outer cylinder member and the second outer cylinder member includes the outer cylinder protrusion at an end closer to the joint.
It is a manufacturing method of exhaust gas purification equipment.
To form the outer cylinder protruding portion at an end closer to the joint portion of either one or both of the first outer cylinder member and the second outer cylinder member.
The first outer cylinder member and the second outer cylinder member are airtightly joined at the joint portion to assemble the outer cylinder, and the inner cylinder containing the exhaust gas purification unit is one of the outer cylinders. Inserting the sealing member from the end of the first outer cylinder, which is an end portion, into the inside of the outer cylinder, and holding the sealing member by sandwiching it between the protruding portion of the inner cylinder and the protruding portion of the outer cylinder.
A method of manufacturing an exhaust gas purification device, including. The method for manufacturing an exhaust gas purification device according to claim 12.
Only the third outer cylinder member, which is one of the first outer cylinder member and the second outer cylinder member, includes the outer cylinder protruding portion.
Manufacturing method of exhaust gas purification device. The method for manufacturing an exhaust gas purification device according to claim 13.
The fourth outer cylinder member, which is the other of the first outer cylinder member and the second outer cylinder member and is not the third outer cylinder member, is externally fitted to the third outer cylinder member at the joint portion.
A method of manufacturing an exhaust gas purification device, including. The method for manufacturing an exhaust gas purification device according to any one of claims 12 to 14.
To integrally form the outer cylinder protruding portion with either one or both of the first outer cylinder member and the second outer cylinder member.
A method of manufacturing an exhaust gas purification device, including. The method for manufacturing an exhaust gas purification device according to any one of claims 12 to 15.
The surface of the outer cylinder protruding portion in contact with the sealing member is configured to be perpendicular to the axial direction of the outer cylinder.
Manufacturing method of exhaust gas purification device. The method for manufacturing an exhaust gas purification device according to any one of claims 12 to 15.
The surface of the outer cylinder protruding portion in contact with the sealing member is directed toward a first direction in which the inner cylinder is inserted into the outer cylinder when the inner cylinder is included in the outer cylinder. It is configured to have a tapered shape in which the inner diameter gradually decreases as it progresses.
Manufacturing method of exhaust gas purification device. The method for manufacturing an exhaust gas purification device according to any one of claims 12 to 17.
The surface of the inner cylinder protruding portion in contact with the sealing member is configured to be perpendicular to the axial direction of the inner cylinder.
Manufacturing method of exhaust gas purification device. The method for manufacturing an exhaust gas purification device according to any one of claims 12 to 17.
The surface of the inner cylinder protruding portion in contact with the sealing member is directed toward a first direction in which the inner cylinder is inserted into the outer cylinder when the inner cylinder is included in the outer cylinder. It is configured to have a tapered shape in which the outer diameter gradually decreases as it progresses.
Manufacturing method of exhaust gas purification device. The method for manufacturing an exhaust gas purification device according to any one of claims 12 to 19.
To detachably fix the inner cylinder to the outer cylinder at the end of the first outer cylinder.
A method of manufacturing an exhaust gas purification device, including. The method for manufacturing an exhaust gas purification device according to claim 20.
The inner cylinder projects from the end of the inner cylinder, which is the end of the inner cylinder on the end side of the first outer cylinder in the axial direction of the inner cylinder, toward the outside in the radial direction over the entire circumference. Equipped with an inner cylinder flange that is a part that has been removed
The outer cylinder is provided with an outer cylinder flange which is a portion of the first outer cylinder end portion protruding outward in the radial direction over the entire circumference.
Fixing the inner cylinder to the outer cylinder by abutting and fastening the inner cylinder flange and the outer cylinder flange to each other.
A method of manufacturing an exhaust gas purification device, including. The method for manufacturing an exhaust gas purification device according to claim 20 or 21.
The inner cylinder protruding portion is arranged at a position farther from the end portion of the first outer cylinder than the center in the axial direction of the inner cylinder.
Manufacturing method of exhaust gas purification device.

Images