JP2011080539A - Pipe periphery contact structure, pipe connecting structure and gas treatment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe periphery contact structure, capable of arresting both rotational movement or axial movement of an intermediate member such as a seal or a cushioning mat, and a pipe connecting structure and a gas treatment device using the pipe periphery contact structure. <P>SOLUTION: A pipe 20 on exhaust upstream side includes projections (ridges 32a, 32b of a PCCP (pseudo-cylindrical concave polyhedral shell)) formed on the outer periphery of a section where a ball joint gasket 28 is disposed. Therefore, the ball joint gasket 28 linearly contacts the pipe 20 particularly strongly at the projection part. Further, the ridges 32a, 32b are formed in a square net-like shape in which they are non-parallel and helically crossed. Therefore, the rotation and axial movement of the ball joint gasket 28 can be arrested even against an impact such as exhaust pressure vibration or vibration in traveling. Thus, the wear of the ball joint gasket 28 can be prevented to prevent imperfect seal, and leak of exhaust air can be thus arrested. This structure can be applied also a catalyst storage structure of an exhaust emission control catalytic converter. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention utilizes a tubular body peripheral surface contact structure in which the tubular body indirectly contacts a member disposed outside or inside the tubular body via an intermediate member disposed on the outer peripheral surface or the inner peripheral surface of the tubular body. The present invention relates to a tube connection structure and a gas treatment device.

A pipe joint, for example, an exhaust pipe joint used for an exhaust system of an internal combustion engine is known (see, for example, Patent Documents 1 and 2).
In patent document 1, it is an exhaust pipe joint which connects an upstream side exhaust pipe and a downstream side exhaust pipe via a spherical-shaped seal body. In this exhaust pipe joint, one or two annular crests are formed on the outer peripheral surface of the pipe end of the upstream side exhaust pipe. The spherical belt-like seal body is stably supported on the outer peripheral surface by being pressed against the annular crest, and the fitting force is increased.

In Patent Document 2, the end of the outer tube is overlapped with the inner tube, and the outer tube is tightened by a tightening band via a gasket.
2. Description of the Related Art An exhaust gas purification catalytic converter provided in a gas processing apparatus, for example, an exhaust system of an internal combustion engine is known (see, for example, Patent Documents 3 to 5).

  In Patent Document 3, a plurality of annular ribs are formed in a portion where a catalyst carrier is disposed in a catalyst case. Both ends of the catalyst carrier are supported by holding rings in the catalyst case. As a conventional example, an example in which a catalyst carrier is loaded in a catalyst case via a holding mat is described.

  In Patent Document 4, a buffer mat is disposed between the catalyst carrier and the outer cylinder. An annular stopper portion or an intermittent bulging portion is formed in the outer cylinder in the axial direction front and rear so that the buffer mat is not displaced in the axial direction more than necessary.

  Patent Document 5 shows an exhaust purification device in which a honeycomb filter is housed in a casing via a sealing material paste layer and a mat-like heat insulating material. The inner peripheral surface of the casing is roughened by fine irregularities. As a result, the heat insulating material can be reliably held by the casing, and the filter is less likely to be displaced.

JP 2003-41932 A (page 4-5, FIGS. 1 and 7) Japanese Examined Patent Publication No. 2-19286 (page 2-3, FIG. 1) JP-A 64-60712 (page 1-2, FIGS. 1 and 3) Japanese Patent Laying-Open No. 2006-70886 (page 4, FIG. 3) JP 2002-70545 A (Page 5-7, FIG. 3)

  In Patent Document 1, one or two annular ridges around the axis are formed in the upstream exhaust pipe. Due to this and the ball-shaped seal body, the axial displacement of the ball-shaped seal body in the upstream exhaust pipe can be prevented. However, since the rotation cannot be prevented in the circumferential direction, it is allowed to slide and rotate the ball-shaped seal body with respect to the upstream exhaust pipe due to the exhaust pressure vibration. As a result, the ball-shaped seal body is worn and the upstream exhaust pipe is worn. And the downstream exhaust pipe may be incompletely sealed.

  Patent Document 2 does not employ a configuration that prevents movement and rotation of the gasket with respect to the inner tube in both the axial direction and the circumferential direction. Even if the axial movement of the flange and the shoulder can be prevented after a certain degree of movement, the rotational movement of the gasket cannot be prevented and the seal between the inner tube and the outer tube may be incomplete due to rotational wear. .

  In Patent Document 3, ribs are formed in the catalyst case, but it is for reinforcement of the catalyst case, and does not prevent rotation of the holding ring between the catalyst case and the catalyst carrier. Furthermore, in the configuration in which the catalyst carrier is held in the catalyst case via the holding mat described as a conventional example in Patent Document 3, a configuration that prevents both the axial movement and the rotational movement of the holding mat is employed. Absent.

  In Patent Document 4, the stopper portion or the bulging portion prevents the buffer mat from moving in the axial direction more than necessary, and the axial movement prevention is incomplete. Furthermore, even if the movement of the buffer mat in the axial direction can be prevented, the rotational movement cannot be prevented, and the buffer between the catalyst carrier and the outer cylinder may be incomplete due to rotational wear.

  In Patent Document 5, the inner peripheral surface of the casing is roughened by forming fine irregularities. Such roughening easily causes the mat or seal to move in the axial direction or rotate in places where strong vibrations are likely to occur, such as the exhaust system of an internal combustion engine. In particular, since the ceramic honeycomb filter is arranged on the inner side, the impact force due to vibration is likely to increase, and the movement cannot be sufficiently prevented only by the rough surface. In addition, when movement occurs, friction with the roughened inner surface of the casing occurs, so that wear may be accelerated.

  The present invention is directed to a tubular body peripheral surface contact structure that can prevent both rotational movement and axial movement of intermediate members such as seals and buffer mats, and a tubular body connection structure and a gas treatment device using the tubular body peripheral surface contact structure. It is what.

In the following, means for achieving the above-mentioned purpose, and its operation and effect are described.
In the tubular body peripheral surface contact structure according to claim 1, the tubular body is in indirect contact with a member disposed outside or inside the tubular body via an intermediate member disposed on the outer circumferential surface or the inner circumferential surface of the tubular body. And a plurality of protrusions are formed on a peripheral surface of a portion where the intermediate member is disposed in the pipe body, and protrusions that are non-parallel to the protrusions. Is present.

On the tube body, a protrusion is formed on the peripheral surface of the portion where the intermediate member is disposed. Therefore, the intermediate member makes a particularly strong linear contact with the tubular body at the protruding portion.
Thus, since it becomes a linear contact, an intermediate member becomes difficult to shift | deviate in directions other than the direction along a linear contact. And since there are non-parallel ridges in the ridge, even if a force that shifts in the direction along the linear contact of one ridge acts on the intermediate member due to an impact such as some vibration or pressure fluctuation The other ridges are not in the linear contact direction. For this reason, the deviation in all directions is eventually prevented. This prevents the intermediate member from rotating and moving in the axial direction.

  In the tubular body peripheral surface contact structure according to claim 2, in the tubular body peripheral surface contact structure according to claim 1, there is a ridge that is made non-parallel when the ridge is in an intersecting state. It is characterized by.

By setting the crossing state in this way, the deviation in all directions can be reliably prevented, and the rotation and the axial movement of the intermediate member can be prevented.
In the tubular body peripheral surface contact structure according to claim 3, in the tubular body peripheral surface contact structure according to claim 1 or 2, the intermediate member is one or both of a seal member and a buffer member. And

  Examples of the intermediate member include one or both of a seal member and a buffer member, and in both cases, rotation and axial movement of the intermediate member can be prevented. This prevents the seal member from being worn, prevents the seal from being incomplete, and prevents leakage and intrusion of gas and liquid.

In addition, since the buffer member is prevented from being worn, it is possible to prevent the buffer from becoming incomplete, and the tube itself, or a member disposed outside or inside the tube body can be protected from impact.
In the tubular body peripheral surface contact structure according to claim 4, the tubular body peripheral surface contact structure according to any one of claims 1 to 3, wherein the protrusion is helical with respect to an axial direction of the tubular body. It is formed in the shape.

In this way, the protrusions may be formed in a helical shape with respect to the axial direction of the tube body, and since there are protrusions non-parallel to these protrusions, displacement in all directions can be prevented.
In the tubular body peripheral surface contact structure according to claim 5, in the tubular body peripheral surface contact structure according to any one of claims 1 to 4, the protrusion is twisted with respect to an axial direction of the tubular body. It is characterized by being formed in a crossed helical shape by having two types of corners in opposite directions.

By forming the ridges in a helical shape that intersects with each other in this way, non-parallel ridges can be arranged on the peripheral surface of the tubular body, and displacement in all directions can be prevented.
In the tubular body peripheral surface contact structure according to claim 6, in the tubular body peripheral surface contact structure according to any one of claims 1 to 5, the protrusions cross in a mesh shape. And

In this way, the protrusions may have a mesh shape, and the resistance force for preventing the displacement of the intermediate member on the peripheral surface of the tube body becomes stronger.
In the tubular body peripheral surface contact structure according to claim 7, in the tubular body peripheral surface contact structure according to any one of claims 1 to 6, a peripheral surface of a portion where the intermediate member is disposed is formed as a polyhedron. The ridges of the polyhedron form the ridges.

Thus, by making a pipe body peripheral surface into a polyhedron, the edges of the polyhedron can be made into ridges, and non-parallel ridges can exist on these ridges.
This makes it possible to form a protrusion that can easily prevent the displacement of the intermediate member.

  In the tubular body peripheral surface contact structure according to claim 8, in the tubular body peripheral surface contact structure according to claim 7, the peripheral surface of the portion where the intermediate member is disposed is a crease in the wall portion of the cylindrical member. It is characterized by being formed as a polyhedron formed with.

  In this way, since a polyhedron is formed by forming a crease in the wall portion with respect to the cylindrical member, it is possible to easily form a protrusion for preventing displacement from the cylindrical member. Therefore, the tube peripheral surface contact structure can be easily realized.

The tubular body peripheral surface contact structure according to claim 9 is the tubular body peripheral surface contact structure according to claim 7 or 8, wherein the polyhedron is a pseudo-cylindrical concave polyhedron.
Thus, the polyhedron may be realized as a pseudo-cylindrical concave polyhedron. By using a convex ridge among the ridges present in such a pseudo-cylindrical concave polyhedron as a non-parallel ridge, a tube peripheral surface contact structure can be easily realized.

  In the tubular body peripheral surface contact structure according to claim 10, in the tubular body peripheral surface contact structure according to any one of claims 1 to 9, the intermediate member is arranged with respect to a peripheral surface of a portion to be arranged. It has a complementary shape.

  By forming the intermediate member in such a complementary shape, that is, a shape that closely adheres to the peripheral surface shape of the portion to be arranged, the intermediate member fits into the unevenness of the peripheral surface formed by the protrusions. Therefore, the prevention of displacement of the intermediate member can be further strengthened.

  In the tubular body connection structure according to claim 11, the intermediate member in the tubular body peripheral surface contact structure according to any one of claims 1 to 10 is used as a seal member, and the seal member is disposed on the outer peripheral surface. The tube body is an inner tube, and the member disposed outside the tube body is an outer tube, and the inner tube and the outer tube are connected by the tubular body peripheral surface contact structure.

  By adopting the tubular body connection structure using the above-described tubular body peripheral surface contact structure, the seal member is not displaced, the wear of the seal member is prevented, and the tightness of the tubular body at the connection portion can be maintained.

  In the tube connection structure according to claim 12, in the tube connection structure according to claim 11, the inner tube and the outer tube are fastened so as to sandwich the seal member with a fastener. It is characterized by.

  When the seal member is clamped between the inner tube and the outer tube by tightening the outer tube with the fasteners in this way, the protrusion of the inner tube further bites into the seal member, so that the seal member is surely displaced in all directions. Can be prevented.

  In the pipe connection structure according to claim 13, in the pipe connection structure according to claim 11 or 12, the inner pipe and the outer pipe are exhaust pipes of an internal combustion engine, and are configured as exhaust pipe joints. It is characterized by that.

  In this way, by applying the above-described tubular body peripheral surface contact structure to the exhaust pipe joint, the seal member does not shift due to pressure vibration in the exhaust system or vibration during running in the case of an internal combustion engine for a vehicle. . For this reason, wear of the seal member is also prevented, and the airtightness in the exhaust pipe at the connection portion can be maintained.

  The gas treatment device according to claim 14 is a gas treatment device in which a gas treatment member is housed in a tube body, and the tube body in the tubular body peripheral surface contact structure according to any one of claims 1 to 10. The case is characterized in that the gas processing member is disposed in the case by the tubular body surface contact structure, with the member disposed in the case via the intermediate member as a gas processing member.

  By using the above-described tube peripheral surface contact structure, the gas processing device in which the gas processing member is arranged in the case prevents the intermediate member in the case from being displaced, prevents the intermediate member from being worn, The function of the intermediate member between the processing member and the case is not hindered.

  The gas processing device according to claim 15 is a gas processing device in which a gas processing member is disposed in an annular case via an intermediate member, and a plurality of protrusions are formed on the inner peripheral surface of the case on the gas downstream side of the intermediate member. In addition to the formation of ridges, the valleys between these ridges are characterized by non-parallel valleys.

When the intermediate member comes into contact with the protrusion on the inner peripheral surface of the case on the gas downstream side due to the difference in airflow pressure between the upstream side and the downstream side, the intermediate member is prevented from shifting in the axial direction.
Since there are non-parallel valleys between the protrusions, unevenness also exists in the axial direction of the case, so that the intermediate member in contact with the unevenness is also prevented from rotating.

Therefore, the intermediate member in the case is not displaced, the wear of the intermediate member is prevented, and the function of the intermediate member between the gas processing member and the case is not hindered.
In the gas treatment device according to claim 16, in the gas treatment device according to claim 15, an inner peripheral surface of the case on the gas downstream side of the intermediate member is formed as a polyhedron, and an edge of the polyhedron is formed by the protrusion and the ridge. It constitutes the valley.

  Thus, you may provide a protrusion and a trough by forming the internal peripheral surface of the case in the gas downstream side as a polyhedron. The protrusions and the valleys do not shift the intermediate member in the case, prevent wear of the intermediate member, and do not hinder the function of the intermediate member between the gas processing member and the case.

  The gas treatment device according to claim 17 is the gas treatment device according to claim 16, wherein the polyhedron is formed as a polyhedron having a fold formed in a wall portion of a cylindrical member.

As described above, since the polyhedron is formed by forming a crease in the wall portion with respect to the cylindrical member, it is possible to easily form protrusions and valleys for preventing displacement in the cylindrical member.
The gas treatment device according to claim 18 is the gas treatment device according to claim 16 or 17, wherein the polyhedron is a pseudo-cylindrical concave polyhedron.

  Thus, the polyhedron may be realized as a pseudo-cylindrical concave polyhedron. Among the ridges present in such a pseudo-cylindrical concave polyhedron, the ridge that is convex on the outer peripheral surface side is the valley on the inner peripheral surface side, and the ridge that is concave on the outer peripheral surface side is the inner peripheral surface. By using it as a protrusion on the side, irregularities can be easily formed on the inner peripheral surface of the case.

  In the gas treatment device according to claim 19, in the gas treatment device according to any one of claims 15 to 18, the intermediate member is formed on a peripheral surface of a portion where the protrusion and the valley are formed. It is characterized by having a complementary shape.

  By forming the intermediate member in such a complementary shape, the intermediate member is surely fitted into the irregularities formed by the protrusions and valleys on the inner periphery of the case, so that the prevention of the displacement of the intermediate member is further strengthened. Can be.

  The gas processing device according to claim 20, wherein the gas processing member is an exhaust purification catalyst, and the case is provided in an exhaust pipe of an internal combustion engine. And an exhaust purification catalyst storage case.

  When the gas processing device is the above-described exhaust purification device, the function of the intermediate member in the purification catalyst storage case is not hindered. For example, when the intermediate member is a seal member, the exhaust does not leak downstream between the purification catalyst storage case and the exhaust purification catalyst, and the exhaust emission is not deteriorated. When the intermediate member is a buffer member, the transmission of impact force from the purification catalyst storage case to the exhaust purification catalyst is suppressed, so that the exhaust purification catalyst can be protected, and as a result, the exhaust emission is not deteriorated.

FIG. 3 is a perspective view of the exhaust pipe joint of the first embodiment. Similarly front view. Similarly left side view. 1 is a schematic view of an exhaust system of an internal combustion engine to which an exhaust pipe joint of Embodiment 1 is applied. FIG. 3 is an exploded perspective view of the exhaust pipe joint of the first embodiment. Similarly exploded front view. Similarly sectional drawing and its partial enlarged view. 3 is a graph showing the relationship between exhaust pressure and diameter change in the pseudo-cylindrical concave polyhedron (PCCP) of the first embodiment. FIG. 6 is a perspective view of an exhaust pipe joint according to a second embodiment. Similarly front view. Similarly left side view. Similarly disassembled perspective view. Similarly longitudinal section and its partial enlarged view. FIG. 6 is a perspective view of an exhaust purification catalytic converter according to a third embodiment. Similarly front view. Similarly left side view. Similarly disassembled perspective view. Similarly a longitudinal section and its partially enlarged view. FIG. 6 is a perspective view of an exhaust purification catalytic converter of a fourth embodiment. Similarly front view. Similarly a longitudinal section and its partially enlarged view. FIG. 6 is a cutaway view of an exhaust purification catalyst storage case in an exhaust purification catalytic converter of a fourth embodiment. Similarly left side view. FIG. 6 is an exploded perspective view of an exhaust purification catalytic converter of a fifth embodiment. The perspective view which shows the other example of a shape of a pseudo-cylindrical concave polyhedron. The perspective view which shows the other example of a shape of a pseudo-cylindrical concave polyhedron.

[Embodiment 1]
1 to 3 show the exhaust pipe joint 2 used in the exhaust system of an internal combustion engine for automobiles, to which the above-mentioned pipe peripheral surface contact structure and pipe connection structure are applied. 1 is a perspective view, FIG. 2 is a front view, and FIG. 3 is a left side view.

  The exhaust pipe joint 2 is configured as ball joints 6, 8, and 10 provided in the exhaust system of the internal combustion engine 4 as schematically shown in FIG. The ball joint 6 on the upstream side connects the exhaust pipe 14 to the pipe body 12a on the rear end side of the exhaust manifold 12, and the next ball joint 8 connects the pipe body 16a on the front end of the catalytic converter 16 to the exhaust pipe 14. The ball joint 10 connects the pipe body 16 b at the rear end of the catalytic converter 16 to the pipe body 18 a on the upstream side of the silencer 18.

The configuration of the exhaust pipe joint 2 will be described. The ball joints 6, 8, and 10 described above are all configured as described below.
In the exhaust pipe joint 2, a flange 22 is fixed to the outer peripheral surface on the rear end side of the pipe body 20 on the exhaust upstream side by welding, so that the flange 22 constitutes a part of the pipe body 20. Further, a flange 26 is fixed to the outer peripheral surface of the distal end side of the tube body 24 on the exhaust downstream side by welding, so that the flange 26 constitutes a part of the tube body 24.

  The upstream flange 22 is welded with a nut portion 22a on the upstream surface, and the downstream flange 26 is provided with a bolt through hole 26a facing the nut portion 22a.

  A fastening bolt 27 is inserted into the bolt through hole 26a from the downstream side, and is screwed into a nut portion 22a welded to the upstream flange 22. A coil spring 30 is disposed between the head of the fastening bolt 27 and the flange 26 on the downstream side. When the fastening bolt 27 is screwed into the nut portion 22a, the coil spring 30 is compressed, thereby causing the downstream side. The flange 26 is pressed against the flange 22 on the upstream side. The flange 22, the nut portion 22a, the bolt through hole 26a of the flange 26 on the downstream side, and the fastening bolt 27 correspond to a fastener.

  Between the upstream flange 22 and the downstream flange 26, as shown in the exploded perspective view of FIG. 5 and the exploded front view of FIG. ing. At the position where the ball joint gasket 28 is disposed, a ridge forming portion 32 formed at the tip of the pipe body 20 on the exhaust upstream side is provided inside.

  The ridge forming portion 32 is originally formed by plastic processing the cylindrical portion of the rear end of the pipe body 20 on the exhaust upstream side with a press die or the like to form folds 32a, 32b, 32c. Thus, a polyhedron is formed. In particular, here, it is formed as a pseudo-cylindrical concave polyhedron (PCCP: Pseudo-Cylindrical Concave Polyshell). The pseudo-cylindrical concave polyhedron here corresponds to a shape in which triangles or trapezoids having a boundary between the convex ridges 32a and 32b on the outer peripheral surface side and the concave ridge 32c on the outer peripheral surface side are combined. In the present embodiment, a combination of triangles is illustrated.

  Accordingly, a plurality of ridges (ridges 32a, 32b) are formed on the peripheral surface of the portion where the ball joint gasket 28 as the intermediate member is disposed, and non-parallel ridges exist on these ridges. ing. In other words, the two types of ridges 32a and 32b are non-parallel, and the directions thereof are two types of helical shapes whose torsion angles are opposite to the axial direction of the pipe body 20 on the exhaust upstream side.

As a result, the ridge forming portion 32 is in an uneven state as shown in FIG. 6, and the arrangement of the convex ridges 32a and 32b is a mesh-like intersection.
Therefore, as shown in the cross-sectional view of FIG. 7 and its partially enlarged view, when the ball joint gasket 28 is pressed between the upstream flange 22 and the downstream flange 26, the ball joint gasket 28 becomes convex ridges. 32a, 32b and the peak P at the position where the ridges 32a, 32b intersect bite into the ball joint gasket 28 from the inside.

  By such a linear bite, the ball joint gasket 28 does not deviate even if it receives pressure vibration of the exhaust from the inside of the pipe body 20 on the upstream side of the exhaust, and even if it receives vibration during traveling of the vehicle.

  In particular, in the present embodiment, the axial displacement of the ball joint gasket 28 is prevented by the two flanges 22 and 26 and is also prevented by the axial unevenness state of the polyhedron of the outer peripheral surface of the ridge forming portion 32. Has been. Furthermore, since the polyhedron on the outer peripheral surface of the ridge forming portion 32 is also uneven in the circumferential direction, the ball joint gasket 28 is also prevented from shifting in the circumferential direction.

According to the first embodiment described above, the following effects can be obtained.
(1) On the pipe body 20 on the exhaust upstream side, protrusions (ridges 32a and 32b) are formed on the outer peripheral surface of the portion where the ball joint gasket 28 is disposed. Therefore, the ball joint gasket 28 makes a particularly strong linear contact with the tube body 20 at the protruding portion.

Thus, since it becomes a linear contact, the ball joint gasket 28 becomes difficult to shift in directions other than the direction along the linear contact.
Furthermore, there are non-parallel ridges on the ridge. Here, the edges 32a and 32b themselves are non-parallel. For this reason, even if a force that shifts in the direction along one linear contact acts on the ball joint gasket 28 due to an impact such as pressure vibration or traveling vibration, the direction is linear contact by all the protrusions. Since the directions do not match, deviation in all directions is prevented. This prevents the ball joint gasket 28 from rotating and moving in the axial direction. This prevents wear of the ball joint gasket 28 as a seal member, prevents the seal from becoming incomplete, and prevents leakage of exhaust gas.

  (2) The arrangement of the ridges 32a and 32b forming the ridges is in a crossed state, is a helical shape crossed by two types of twist angles in opposite directions, and further has a square mesh shape. ing.

By setting the crossing state in this manner, the displacement in all directions is reliably prevented, and the rotation and axial movement of the ball joint gasket 28 can be prevented.
As a result, the displacement in all directions can be reliably prevented, and the resistance force for preventing the displacement of the ball joint gasket 28 on the peripheral surface of the tube body becomes stronger.

  (3) The ridges 32a, 32b, and 32c constituting the unevenness are formed as polyhedrons in which folds are formed on the wall portion of the cylindrical member. Here, it is formed as a pseudo-cylindrical concave polyhedron. For this reason, the ridges 32a, 32b in the convex state among the ridges 32a, 32b, 32c existing in the pseudo-cylindrical concave polyhedron are used as non-parallel protrusions, so that the exhaust having the tubular body peripheral surface contact structure of the present invention is provided. The pipe joint 2 can be easily realized.

  (4) The pipe body 20 that is the inner pipe and the pipe body 24 that is the outer pipe (particularly the flange 26) by the fastener comprising the flange 22, the nut portion 22a, the bolt through hole 26a of the downstream flange 26, and the fastening bolt 27. Part). As a result, the ridges (ridges 32a and 32b) formed on the ridge forming portion 32 of the tubular body 20 bite into the ball joint gasket 28 in a linear manner, thereby reliably shifting the ball joint gasket 28 in all directions. Can be prevented.

  (5) Since the ridge forming portion 32 of the tubular body 20 is a pseudo-cylindrical concave polyhedron (PCCP), the ridge forming portion 32 has an increase in internal pressure (kPa) due to exhaust gas flowing through the tubular body 20 as shown in FIG. A large change in diameter (mm) occurs as indicated by the solid line in the graph. In the cylindrical tube not formed as a pseudo-cylindrical concave polyhedron, as shown by a broken line in the graph, only a small diameter change occurs with respect to an increase in internal pressure (kPa).

  Therefore, as shown in the drawing, the ridge forming portion 32 of the tubular body 20 is a pseudo-cylindrical concave polyhedron, whereby the diameter change with respect to the increase in internal pressure can be amplified. Accordingly, the protrusions (ridges 32a and 32b) of the protrusion forming portion 32 press the ball joint gasket 28 from the inside at a pressure corresponding to the internal pressure. As a result, even if the exhaust pressure increases, the degree of adhesion between the protrusion forming portion 32 and the ball joint gasket 28 increases, and exhaust leakage can be reliably prevented.

[Embodiment 2]
An exhaust pipe joint 102 of the present embodiment is shown in FIGS. The exhaust pipe joint 102 is applied with the pipe peripheral surface contact structure and the pipe connection structure described in the claims, and is used in an exhaust system of an automobile internal combustion engine. 9 is a perspective view, FIG. 10 is a front view, FIG. 11 is a left side view, FIG. 12 is an exploded perspective view, and FIG. 13 is a longitudinal sectional view.

The exhaust pipe joint 102 is used in place of the ball joints 6, 8, and 10 described in FIG. 4 of the first embodiment.
The exhaust pipe joint 102 includes a protrusion forming part 122 provided at the rear end of the pipe body 120 on the exhaust upstream side, an enlarged part 126 as an outer pipe provided at the front end of the pipe body 124 on the exhaust downstream side, and a protrusion forming. A gasket 128 disposed between the portion 122 and the enlarged portion 126 and a tightening band 130 disposed outside the enlarged portion 126 are provided. The gasket 128 is an intermediate member and corresponds to a seal member.

  The enlarged portion 126 has a slit 126a formed axially rearward from the tip side. Six slits 126a are formed at equiangular intervals around the axis. As a result, the gasket 128 is fitted to the ridge forming portion 122 so that the enlarged portion 126 covers the gasket 128 by opening the slit 126a with respect to the ridge forming portion 122 fitted with the gasket 128. Can be pinched. As a result, the pipe 124 on the exhaust downstream side can be connected to the pipe 120 on the exhaust upstream side via the gasket 128.

  Then, from the outside of the enlarged portion 126 riding on the gasket 128, the fastening band 130, which is a fastener, is disposed with the cut 130a being opened. Then, a bolt 130d (FIG. 13) is inserted into a hole 130c opened at the center of the ear portion 130b that faces both sides of the cut 130a, and a nut is screwed into the bolt 130d from the opposite side to the insertion direction. Then, the bolts are fastened so that the ears 130b come close to each other.

As a result, the tightening band 130 tightens the enlarged portion 126, and the gasket 128 is strongly tightened between the enlarged portion 126 and the ridge forming portion 122.
As described in the first embodiment, the ridge forming portion 122 is originally formed by bending the cylindrical portion of the rear end of the pipe body 120 on the exhaust upstream side with a press die to form a crease. 122a, 122b, and 122c, and this forms a polyhedron. Again, it is formed as a pseudo-cylindrical concave polyhedron (PCCP). Here, the pseudo-cylindrical concave polyhedron corresponds to a shape combining triangles or trapezoids with the convex ridges 122a and 122b and the concave ridge 122c as boundaries when viewed from the outer peripheral surface side. In the present embodiment, a combination of triangles is illustrated.

  Accordingly, a plurality of ridges (ridges 122a, 122b) are formed on the peripheral surface of the portion where the gasket 128 as the intermediate member is disposed, and these are non-parallel ridges. The two types of ridges 122a and 122b are non-parallel, and their directions form two types of helical shapes having opposite twist angles with respect to the axial direction of the pipe body 120 on the exhaust upstream side.

  As a result, as shown in the figure, the protrusion forming portion 122 has a linear uneven state on the outer peripheral surface, and the arrangement of the convex ridges 122a and 122b is a cross of a mesh shape (a square mesh shape).

  Therefore, as shown in the cross-sectional view of FIG. 13 and a partially enlarged view thereof, a gasket 128 is provided between the protrusion forming portion 122 formed on the exhaust pipe 120 on the upstream side and the enlarged portion 126 of the downstream pipe 124. When pressed, convex ridges 122a and 122b bite into the gasket 128 linearly from the inside. In particular, the peak P at the position where the edges 122a, 122b, and 122c cross each other strongly bites.

Due to such bite, the gasket 128 does not deviate even if it is subjected to pressure vibration of exhaust from the inside of the pipe body 120 on the exhaust upstream side or vibration during traveling of the vehicle.
In particular, in the present embodiment, the axial displacement and the rotational displacement of the gasket 128 are both prevented by the intersecting helical irregularities on the polyhedron of the outer peripheral surface of the ridge forming portion 122.

Therefore, the present embodiment produces the same effects as described in the first embodiment.
[Embodiment 3]
14 to 18 show an exhaust purification catalytic converter 202 as a gas processing apparatus of the present embodiment. 14 is a perspective view, FIG. 15 is a front view, FIG. 16 is a left side view, FIG. 17 is an exploded perspective view showing the internal configuration, and FIG. 18 is a longitudinal section and a partially enlarged view thereof.

  The exhaust purification catalytic converter 202 is provided in an exhaust pipe of an automotive internal combustion engine, and includes an exhaust purification catalyst storage case 204, a monolithic catalyst 206 as a gas processing member, and a buffer member 208 that also serves as a seal member. ing. Note that the monolith type catalyst 206 is a monolith carrier on which a catalyst is supported, and there are various forms. However, only the outer shape is simply shown as a cylindrical shape here.

  In the exhaust purification catalyst storage case 204, a monolithic catalyst 206 and a buffer member 208 are disposed inside the main body cylindrical portion 210, and then a funnel-like introduction portion 212 and a discharge portion 214 are connected to each other by welding or the like. Is.

  The entire main body cylindrical portion 210 is plastically processed by a press die or the like to form folds 210a, 210b, 210c, as in the protrusion forming portion of the first and second embodiments. Thus, it is formed as a polyhedron, here a pseudo-cylindrical concave polyhedron.

  The pseudo-cylindrical concave polyhedron has a shape combining triangles with the concave ridges 210a and 210b and the convex ridge 210c as a boundary when viewed from the inner peripheral surface side. In this embodiment, a combination of triangles is illustrated, but a combination of trapezoids may be used.

  Therefore, a plurality of grooves (concave ridges 210a and 210b) are formed on the inner peripheral surface of the main body cylindrical portion 210, and these two types of grooves (ridges 210a and 210b) are non-parallel. That is, the two types of ridges 210 a and 210 b are non-parallel, and their directions form two types of helical shapes whose twist angles are opposite to the axial direction of the exhaust purification catalytic converter 202.

  As a result, the main body cylindrical portion 210 is in a concavo-convex state as shown in FIGS. 14, 15, and 17, and the arrangement of the concave ridges 210 a and 210 b is a cross of a mesh shape (a square mesh shape).

  Accordingly, as shown in the sectional view of FIG. 18 and a partially enlarged view thereof, when the monolithic catalyst 206 and the buffer member 208 are pushed into the exhaust purification catalyst storage case 204 and arranged, the buffer member 208 has a plurality of grooves (ridges 210a, Bite into 210b).

  Even if the buffer member 208 and the monolithic catalyst 206 are subjected to exhaust pressure from the exhaust upstream side due to such bite, even if they are subjected to exhaust pressure vibration or vehicle running vibration, the axial direction of the buffer member 208 is reduced. Both the shift and the circumferential shift can be prevented by the helical grooves (ridges 210a and 210b) whose directions are reversed by the polyhedron.

According to the third embodiment described above, the following effects are produced.
(1) The arrangement of grooves (ridges 210a and 210b) formed on the inner peripheral surface of the main body cylindrical portion 210 of the exhaust purification catalyst storage case 204 is in an intersecting state, and the twist angle is composed of two types in opposite directions. This is a helical shape that intersects with each other, and further has a mesh shape (square mesh shape). As a result, the linear biting directions by the grooves do not coincide with each other, so that the deviation in all directions is prevented, and the rotation and axial movement of the buffer member 208 can be prevented.

  This prevents wear of the buffer member 208 that also serves as a seal member, prevents incomplete buffering and sealing, complete protection of the monolith catalyst 206, and complete exhaust purification by the monolith catalyst 206. Can be.

  (2) The ridges 210a, 210b, and 210c constituting the unevenness are formed as polyhedrons in which folds are formed on the wall portion of the cylindrical member. Here, it is formed as a pseudo-cylindrical concave polyhedron. Therefore, by using the ridges 210a, 210b that are concave on the inner peripheral surface among the ridges 210a, 210b, 210c existing in the pseudo-cylindrical concave polyhedron as non-parallel grooves, the tubular peripheral surface contact of the present invention is achieved. The exhaust purification catalytic converter 202 which is a gas processing device having a structure can be easily realized.

[Embodiment 4]
19 to 21 show an exhaust purification catalytic converter 302 as a gas processing apparatus of the present embodiment. 19 is a perspective view, FIG. 20 is a front view, and FIG. 21 is a longitudinal section and a partially enlarged view thereof.

  The exhaust purification catalytic converter 302 is provided in an exhaust pipe of an internal combustion engine, and includes an exhaust purification catalyst storage case 304, a monolithic catalyst 306, and a buffer member 308 that also serves as a seal member. This configuration is basically the same as in the third embodiment. Note that the monolith type catalyst 306 is a monolith carrier on which a catalyst is supported, and various forms exist, but are simply shown here.

  The difference from the third embodiment is that the entire surface of the main body cylindrical portion 310 of the exhaust purification catalyst storage case 304 is not a pseudo-cylindrical concave polyhedron, but is formed in a ring shape in a region almost in contact with the lead-out portion 314. This is a point where a pseudo-cylindrical concave polyhedron 316 is formed. The ring-shaped pseudo-cylindrical concave polyhedron 316 is also formed by the method described in the first embodiment.

  The monolithic catalyst 306 and the buffer member 308 are mainly disposed in the cylindrical portion 318 that is not particularly a polyhedron in the main body cylindrical portion 310 when the exhaust purification catalytic converter 302 is assembled. In particular, the downstream end 308 a of the buffer member 308 is configured to contact the pseudo-cylindrical concave polyhedron 316.

  Therefore, when the exhaust purification catalytic converter 302 is attached to the exhaust pipe of the internal combustion engine after assembly, as shown by the solid line arrow in FIG. The member 308 generates a biasing force toward the downstream side. However, when the downstream end 308a of the buffer member 308 is in contact with the pseudo-cylindrical concave polyhedron 316, the buffer member 308 further bites into the pseudo-cylindrical concave polyhedron 316.

  For this reason, the buffer member 308 is prevented from moving in the axial direction, and the pseudo-cylindrical concave polyhedron 316 is formed as shown in the axial orthogonal fracture view of FIG. 22 and the left side view of FIG. Moreover, the uneven | corrugated state in the circumferential direction is also exhibited in the inner peripheral surface. Therefore, the buffer member 308 in contact with the pseudo-cylindrical concave polyhedron 316 is also prevented from rotating around the axis.

According to the fourth embodiment described above, the following effects are produced.
(1) In the main body cylindrical portion 310 of the exhaust purification catalyst storage case 304, the pseudo-cylindrical concave polyhedron 316 formed on the inner peripheral surface on the downstream end side is a polyhedron that is uneven even in the circumferential direction. Thus, the rotation and axial movement of the buffer member 308 can be prevented.

  This prevents wear of the buffer member 308, which also serves as a seal member, prevents incomplete buffering and sealing, complete protection of the monolith type catalyst 306, and complete exhaust purification by the monolith type catalyst 306. Can be.

  (2) The pseudo-cylindrical concave polyhedron 316 is a part of the downstream end side of the main body cylindrical portion 310, and the exhaust purification catalytic converter 302, which is a gas processing device having a tubular peripheral surface contact structure of the present invention, is described in the above embodiment. It can be manufactured more easily than 3.

[Embodiment 5]
An exploded perspective view of the exhaust purification catalytic converter 402 of the present embodiment is shown in FIG. The exhaust purification catalytic converter 402 of the present embodiment and the exhaust purification catalytic converter of the third embodiment have the same shape with respect to the exhaust purification catalyst storage case 404 and the monolithic catalyst 406, but the shape of the buffer member 408 is different. .

  The buffer member 408 has the same inner peripheral surface 408a on which the monolithic catalyst 406 is disposed as in the third embodiment, but the outer peripheral surface 408b in contact with the inner peripheral surface of the exhaust purification catalyst storage case 404 has It is formed in a complementary shape to the inner peripheral surface shape of the main body cylindrical portion 410 which is a pseudo-cylindrical concave polyhedron.

  That is, the outer peripheral surface 408b of the buffer member 408 is formed in a shape when the concave and convex shape of the inner peripheral surface of the main body cylindrical portion 410 in the exhaust purification catalyst storage case 404 is molded as a mold.

  Thus, when the buffer member 408 is disposed in the exhaust purification catalyst storage case 404 together with the monolithic catalyst 406, the outer peripheral surface 408b of the buffer member 408 is completely aligned with the inner peripheral surface of the main body cylindrical portion 410 of the exhaust purification catalyst storage case 404. It fits into a certain concavo-convex shape and is in a sufficiently close contact state.

  As a result, in addition to the effects of the third embodiment, the buffer member 408 has a complementary shape with respect to the main body cylindrical portion 410 of the exhaust purification catalyst storage case 404, thereby effectively preventing displacement of the buffer member 408 in all directions. Thus, the rotation and axial movement of the buffer member 408 can be more reliably prevented.

  This prevents wear of the buffer member 408, which also serves as a seal member, prevents incomplete buffering and sealing, complete protection of the monolithic catalyst 406, and complete exhaust purification by the monolithic catalyst 406. Can be.

[Other embodiments]
In each of the above embodiments, the pseudo-cylindrical concave polyhedron has a triangular surface, but a pseudo-cylindrical concave polyhedron 502 with a trapezoidal surface 502a as shown in FIG. A pseudo-cylindrical concave polyhedron 602 having both a triangular surface 602a and a trapezoidal surface 602b as shown in FIG. 26 may be used. The effects described in the respective embodiments are generated.

  In the example of the pseudo-cylindrical concave polyhedron shown in each of the above embodiments, each surface of the pseudo-cylindrical concave polyhedron is a triangle, so that the ridges intersect in a square mesh shape, and a seal member or buffer An intermediate member such as a member contacts a square mesh.

  However, in the pseudo-cylindrical concave polyhedron 502 of FIG. 25, the ridges 504, 506, and 508 intersect with each other in a hexagonal mesh shape. It will come in contact with the mesh.

  Further, in the pseudo-cylindrical concave polyhedron 602 of FIG. 26, since the ridges 604, 606, 608, 610, 612 of the ridges intersect with each other in a square and hexagonal mesh shape, intermediate members such as a seal member and a buffer member In contrast, both square and hexagonal mesh-like contact states are mixed.

  In the first and second embodiments, a gasket is disposed as a seal member between the inner tube and the outer tube, but a buffer member may be disposed instead of this, and both the seal member and the buffer member are disposed. It may be arranged. Also in this case, as described in the first and second embodiments, since the displacement of the buffer member in all directions is prevented, its rotation and axial movement can be prevented. This prevents wear of the buffer member, prevents the buffer from being incomplete, and protects the inner tube and the outer tube.

  -Although the said Embodiment 3, 4 and 5 were the exhaust purification catalytic converters for the exhaust purification catalyst of an internal combustion engine, in addition to this, in the catalytic converter which arrange | positions the catalyst which makes gas react with a chemical reaction apparatus It can also be used.

  2 ... exhaust pipe joint, 4 ... internal combustion engine, 6, 8, 10 ... ball joint, 12 ... exhaust manifold, 12a ... pipe body, 14 ... exhaust pipe, 16 ... catalytic converter, 16a, 16b ... pipe body, 18 ... mute 18a ... tube, 20 ... tube, 22 ... flange, 22a ... nut, 24 ... tube, 26 ... flange, 26a ... bolt through hole, 27 ... fastening bolt, 28 ... ball joint gasket, 30 ... coil Spring, 32 ... ridge forming portion, 32a, 32b, 32c ... ridge, 102 ... exhaust pipe joint, 120 ... pipe body, 122 ... ridge forming portion, 122a, 122b, 122c ... ridge, 124 ... tube body, 126 ... Enlarged portion, 126a ... slit, 128 ... gasket, 130 ... tightening band, 130a ... cut, 130b ... ear, 130c ... hole, 130d ... bolt, 20 DESCRIPTION OF SYMBOLS ... Exhaust purification catalyst converter, 204 ... Exhaust purification catalyst storage case, 206 ... Monolith type catalyst, 208 ... Buffer member, 210 ... Main body cylindrical part, 210a, 210b, 210c ... Ridge, 212 ... Introducing part, 214 ... Deriving part, 302 DESCRIPTION OF SYMBOLS ... Exhaust purification catalyst converter 304 ... Exhaust purification catalyst storage case, 306 ... Monolith type catalyst, 308 ... Buffer member, 308a ... Downstream end, 310 ... Main body cylindrical part, 312 ... Introduction part, 314 ... Derivation part, 316 ... Pseudo Cylindrical concave polyhedron, 318 ... cylindrical portion, 402 ... exhaust purification catalyst converter, 404 ... exhaust purification catalyst storage case, 406 ... monolith type catalyst, 408 ... buffer member, 408a ... inner peripheral surface, 408b ... outer peripheral surface, 410 ... Main body cylindrical part, 502 ... pseudo-cylindrical concave polyhedron, 502a ... trapezoidal surface, 504, 506, 508 ... ridge, 602 ... pseudo-cylinder Concave face piece, 602a ... triangular faces, 602b ... trapezoidal surfaces, 604,606,608,610,612 ... crest, P ... peak.

Claims (20)

A tubular body peripheral surface contact structure in which the tubular body indirectly contacts a member disposed outside or inside the tubular body via an intermediate member disposed on the outer circumferential surface or the inner circumferential surface of the tubular body,
A plurality of protrusions are formed on a peripheral surface of a portion where the intermediate member is disposed in the pipe body, and non-parallel protrusions exist on these protrusions. Body surface contact structure. The tubular body peripheral surface contact structure according to claim 1, wherein the projecting surface has a projecting surface that is made non-parallel by being in a crossed state. The tubular body peripheral surface contact structure according to claim 1 or 2, wherein the intermediate member is one or both of a seal member and a buffer member. The tubular body peripheral surface contact structure according to any one of claims 1 to 3, wherein the protrusion is formed in a helical shape with respect to an axial direction of the tubular body. Surface contact structure. The tubular body peripheral surface contact structure according to any one of claims 1 to 4, wherein the ridges are crossed by two types of twist angles opposite to the axial direction of the tubular body. A tubular peripheral surface contact structure characterized by being formed in a shape. The tubular body peripheral surface contact structure according to any one of claims 1 to 5, wherein the protrusions cross in a mesh shape. In the tubular body peripheral surface contact structure according to any one of claims 1 to 6, a peripheral surface of a portion where the intermediate member is disposed is formed as a polyhedron, and an edge of the polyhedron constitutes the protrusion. A tube peripheral surface contact structure characterized by comprising: The tubular body peripheral surface contact structure according to claim 7, wherein a peripheral surface of a portion where the intermediate member is disposed is formed as a polyhedron having a fold formed on a wall portion of a cylindrical member. Tubular surface contact structure. 9. The tubular body peripheral surface contact structure according to claim 7 or 8, wherein the polyhedron is a pseudo-cylindrical concave polyhedral body. The tubular body peripheral surface contact structure according to any one of claims 1 to 9, wherein the intermediate member has a complementary shape with respect to a peripheral surface of a portion to be disposed. Surface contact structure. The intermediate member in the tubular body peripheral surface contact structure according to any one of claims 1 to 10 is a seal member, and the tubular body in which the seal member is disposed on the outer peripheral surface is an inner tube, A tubular body connection structure in which the inner tube and the outer tube are connected by the tubular body peripheral surface contact structure using the arranged member as an outer tube. 12. The tube connection structure according to claim 11, wherein the inner tube and the outer tube are fastened so as to sandwich the seal member with a fastener. 13. The tube connection structure according to claim 11 or 12, wherein the inner tube and the outer tube are exhaust pipes of an internal combustion engine and are configured as exhaust pipe joints. It is a gas processing apparatus which accommodated the gas processing member in the pipe body, uses the said pipe body in the pipe body peripheral surface contact structure as described in any one of Claims 1-10 in a case via the said intermediate member. A gas processing apparatus in which a gas processing member is disposed in a case by the tubular body peripheral surface contact structure, with the member disposed on the surface being a gas processing member. A gas processing device having a gas processing member disposed in a tubular case via an intermediate member, and a plurality of protrusions are formed on the inner peripheral surface of the case on the gas downstream side of the intermediate member, and these protrusions A gas processing apparatus characterized in that non-parallel valleys exist in the valleys between them. The gas processing apparatus according to claim 15, wherein an inner peripheral surface of the case on the gas downstream side of the intermediate member is formed as a polyhedron, and a ridge of the polyhedron forms the ridge and the valley. Gas processing equipment. The gas processing apparatus according to claim 16, wherein the polyhedron is formed as a polyhedron in which a fold is formed in a wall portion of a cylindrical member. 18. The gas processing apparatus according to claim 16, wherein the polyhedron is a pseudo-cylindrical concave polyhedron. 19. The gas processing apparatus according to claim 15, wherein the intermediate member has a complementary shape with respect to a peripheral surface of a portion where the protrusion and the valley are formed. A gas processing device. The gas processing device according to any one of claims 14 to 19, wherein the gas processing member is an exhaust purification catalyst, and the case is an exhaust purification catalyst storage case provided in an exhaust pipe of an internal combustion engine. A gas processing device.

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