JP2017009076A - Gasket unit and spherical surface joint unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gasket unit and a spherical surface joint unit showing superior workability in an assembling operation and capable of preventing occurrence of abnormal sound.SOLUTION: A spherical surface joint unit 1 is used for an exhaust gas system of an automobile and includes an engine side exhaust pipe 2a, a rear muffler side exhaust pipe 2b, a flange 3 and a gasket 4 attached to the exhaust pipe 2a, a gasket seat 5 having a flange that is fixed to the exhaust pipe 2b, and a bolt 6 with spring and a nut 7 for connecting the exhaust pipes 2a, 2b. An inner circumferential surface 44 of the gasket 4 is formed with a rib 45 along a direction of an axis O. In addition, an outer circumferential surface 21a of the exhaust pipe 2a having the gasket 4 installed therein is formed with a groove 22a storing this rib 45 from an end part 20a inwardly in an axial direction along a direction of the axis O.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gasket unit including a gasket and an exhaust pipe to which the gasket is attached, and more particularly to a gasket unit suitable for a spherical joint that connects exhaust pipes of an automobile.

  Conventionally, in an exhaust system of an automobile, exhaust pipes are connected to each other by a spherical joint, and vibration transmitted from the engine to the exhaust pipe is attenuated by the spherical joint to suppress the transmission of the vibration to the vehicle body. Patent Document 1 discloses a gasket suitable for a spherical joint that connects exhaust pipes of an automobile.

  This gasket (spherical seal) is a cylindrical body having a spherical outer peripheral surface, and is attached to the end of one exhaust pipe to be connected, and a gasket seat (concave spherical surface) provided at the end of the other exhaust pipe. It is in sliding contact with the spherical inner peripheral surface of the seal seat). A plurality of ribs arranged at equal intervals in the circumferential direction are formed along the axial direction on the inner peripheral surface of the gasket. These ribs are formed of a heat-resistant material that can be compressed and deformed, such as expanded graphite, and are crushed when the gasket is attached to the exhaust pipe. For this reason, when the gasket is attached to the exhaust pipe, the rib reliably contacts the exhaust pipe, and the gasket is prevented from falling off the exhaust pipe. Therefore, according to the gasket of patent document 1, the assembly | attachment operation | work to an exhaust pipe can be improved.

JP 2014-185648 A

  By the way, stress in various directions is applied to the exhaust unit due to vibrations transmitted from the engine to the exhaust pipe, vibrations transmitted from the road surface to the exhaust pipe through the vehicle body during traveling, and the like. When a torsional stress is applied to the exhaust pipes connected by the spherical joint, the gasket attached to the exhaust pipe may rotate and generate abnormal noise. In order to solve this problem in the spherical joint described in Patent Document 1, the number of ribs formed on the inner peripheral surface of the gasket is increased, or ribs are formed with a heat-resistant material having higher hardness, and the exhaust pipe It is necessary to increase the circumferential friction of the gasket attached to the. However, along with this, axial friction when the gasket is mounted on the exhaust pipe also increases. As a result, in order to attach the gasket to the exhaust pipe, a high pressure must be applied using a tool such as an impact, and workability at the time of assembling the gasket to the exhaust pipe is deteriorated.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gasket unit and a spherical joint unit that are excellent in workability during assembly and can prevent the generation of abnormal noise. .

  In order to solve the above problems, in the present invention, a rib is formed along the axial direction on one of the inner peripheral surface of the gasket and the outer peripheral surface of the exhaust pipe to which the gasket is attached. On the other hand, a groove that accommodates the rib is formed along the axial direction, or a notch that fits with the rib is formed from the end to the inside along the axial direction.

For example, the present invention is a gasket unit comprising a gasket and an exhaust pipe to which the gasket is attached,
One of the inner peripheral surface of the gasket and the outer peripheral surface of the exhaust pipe has a rib formed along the axial direction, and the other has a groove formed along the axial direction and accommodating the rib.

Alternatively, the present invention is a gasket unit comprising a gasket and an exhaust pipe to which the gasket is attached,
One of the inner peripheral surface of the gasket and the outer peripheral surface of the exhaust pipe has a rib formed along the axial direction, and the other is formed inward from the end along the axial direction. Has a matching notch.

Further, the present invention is a spherical joint unit for connecting exhaust pipes,
The gasket unit;
Another exhaust pipe connected to the exhaust pipe of the gasket unit;
A gasket seat provided at an end of the other exhaust pipe and having a spherical inner peripheral surface that is in sliding contact with the spherical outer peripheral surface of the gasket of the gasket unit.

  In the present invention, a rib is formed along the axial direction on one of the inner peripheral surface of the gasket and the outer peripheral surface of the exhaust pipe to which the gasket is mounted, and a groove for accommodating the rib is formed along the axial direction on the other side. A notch that fits with the rib is formed from the end to the inside along the axial direction. For this reason, when the rib is accommodated in the groove or fitted into the notch, the friction of the gasket attached to the exhaust pipe is not increased without increasing axial friction when the gasket is attached to the exhaust pipe. Rotation can be prevented. Therefore, according to this invention, it is excellent in workability | operativity at the time of an assembly | attachment, and generation | occurrence | production of abnormal noise can be prevented.

1A is a cross-sectional view of the spherical joint unit 1 according to the first embodiment of the present invention, and FIG. 1B is an enlarged view of part A of the spherical joint unit 1 shown in FIG. 1A. It is. FIG. 2 is a view for explaining the operation principle of the spherical joint unit 1. 3A is a front view of the gasket 4, FIG. 3B is a cross-sectional view of the gasket 4 taken along the line B-B shown in FIG. 3A, and FIG. It is a rear view. 4A is a side view of the gasket mounting portion 23a of the exhaust pipe 2a viewed from the end 20a side, and FIG. 4B is an axial sectional view of the gasket mounting portion 23a of the exhaust pipe 2a. . FIG. 5 (A) is a cross-sectional view of the spherical joint unit 1 ′ according to the second embodiment of the present invention, and FIG. 5 (B) is a section C of the spherical joint unit 1 ′ shown in FIG. 5 (A). 5C is an enlarged view, and FIG. 5C is an enlarged view of a D portion of the spherical joint unit 1 ′ shown in FIG. 5A. 6A is a front view of the gasket 4 ′, FIG. 6B is an EE cross-sectional view of the gasket 4 ′ shown in FIG. 6A, and FIG. 6C is a gasket. 4 'is a rear view, and FIG. 6 (D) is an enlarged view of an F portion of the gasket 4 ′ shown in FIG. 6 (B). 7A is a side view of the gasket mounting portion 23′a of the exhaust pipe 2′a as viewed from the end 20a side, and FIG. 7B is a gasket mounting portion 23 ′ of the exhaust pipe 2′a. It is an axial sectional view of a.

  Embodiments of the present invention will be described below with reference to the drawings.

<First embodiment>
First, a first embodiment of the present invention will be described.

  1A is a cross-sectional view of the spherical joint unit 1 according to the present embodiment, and FIG. 1B is an enlarged view of a portion A of the spherical joint unit 1 shown in FIG.

  The spherical joint unit 1 according to the present embodiment is used in an automobile exhaust system. As shown in the figure, the spherical joint unit 1 includes an exhaust pipe 2a on the engine side, an exhaust pipe 2b on the rear muffler side, a flange 3 and a gasket 4 attached to the exhaust pipe 2a, and a flange attached to the exhaust pipe 2b. The gasket seat 5 is provided with a bolt 6 with a spring and a nut 7 that connect the exhaust pipes 2a and 2b.

  The flange 3 is attached to the exhaust pipe 2a, and is fixed to the exhaust pipe 2a by welding or the like at an axially inward position from the end 20a of the exhaust pipe 2a by the length L in the axis O direction of the gasket 4. The flange 3 is formed with a bolt hole 30 for inserting the spring-loaded bolt 6.

  The gasket 4 is a cylindrical body having a large-diameter side end surface 40, a small-diameter side end surface 41, and a spherical outer peripheral surface 42. The large-diameter side end surface 40 is in contact with the flange 3, and the small-diameter side end surface 41 is exhausted. The exhaust pipe 2a is mounted so as to be flush with the end 20a of the pipe 2a or protrude from the end 20a. The gasket 4 is formed of a reinforcing material such as a wire mesh and a heat resistant material such as expanded graphite.

  The flanged gasket seat 5 includes a large-diameter opening 50, a small-diameter opening 51, a spherical inner peripheral surface 52 having substantially the same diameter as the outer peripheral surface 42 of the gasket, and a small-diameter opening 51 along the axis O direction. A cylindrical portion 53 into which the exhaust pipe 2b is inserted and a flange 54 formed integrally with the large-diameter opening 52 from the large-diameter opening 50 outward in the radial direction are formed. The cylindrical portion 53 is attached to the exhaust pipe 2b by welding or the like with the small-diameter opening 51 being flush with the end 20b of the exhaust pipe 2b or mounted on the exhaust pipe 2a so as to protrude from the end 20b. Fixed. Bolt holes 55 for inserting spring-loaded bolts 6 are formed in the flange 54.

  The spring-loaded bolt 6 is screwed into the nut 7 via the bolt hole 30 of the flange 3 and the bolt hole 55 of the flange 54, so that the spherical outer peripheral surface 42 of the gasket 4 is replaced with the spherical shape of the gasket seat 5 with flange. The exhaust pipes 2a and 2b are connected while being urged in a direction in which they are pressed against the inner peripheral surface 52.

  The spherical outer peripheral surface 42 of the gasket 4 and the spherical inner peripheral surface 52 of the flanged gasket seat 5 are brought into contact with each other when the exhaust pipes 2 a and 2 b are connected by the spring-loaded bolt 6 and the nut 7. The maximum static frictional force of the spherical outer peripheral surface 42 of the gasket 4 and the spherical inner peripheral surface 52 of the flanged gasket seat 5 that are in contact with each other is determined by the friction characteristics of the outer peripheral surface 42 and the inner peripheral surface 52, and the spring. It is determined by the urging force (force that presses the outer peripheral surface 42 against the inner peripheral surface 52) by the auxiliary bolt 6 and the nut 7.

  In the spherical joint unit 1 shown in FIG. 1, the flange 3 is fixed to the exhaust pipe 2a by welding or the like, but the flange 3 may be formed integrally with the exhaust pipe 2a. Similarly, the flanged gasket seat 5 is fixed to the exhaust pipe 2b by welding or the like, but the flanged gasket seat 5 may be formed integrally with the exhaust pipe 2b.

  FIG. 2 is a view for explaining the operation principle of the spherical joint unit 1.

  As shown in the drawing, the spherical joint unit 1 has a torque T (by the inner peripheral surface 52) that generates a maximum static frictional force between the outer peripheral surface 42 of the gasket 4 and the inner peripheral surface 52 of the flanged gasket seat 5 that are in contact with each other. Sliding occurs when a bending moment equal to or greater than a torque having a specified center C of the sphere as a rotation center. Thereby, the vibration transmitted from the exhaust pipe 2a on the engine side to the exhaust pipe 2b on the rear muffler side can be attenuated.

  Next, the gasket 4 and the exhaust pipe 2a to which the gasket 4 is attached will be described in more detail.

  3A is a front view of the gasket 4, FIG. 3B is a cross-sectional view of the gasket 4 taken along the line B-B shown in FIG. 3A, and FIG. It is a rear view.

  As described above, the gasket 4 is a cylindrical body having the large-diameter side end surface 40, the small-diameter side end surface 41, and the spherical outer peripheral surface 42, and is made of a reinforcing material such as a wire mesh and a heat-resistant material such as expanded graphite. It is formed. Further, as shown in the drawing, a plurality of ribs 45 are formed along the axis O direction on the inner peripheral surface 44 of the insertion hole 43 into which the exhaust pipe 2a is inserted. The rib 45 extends from the small-diameter side end surface 41 toward the large-diameter side end surface 40, that is, from the end 20a side of the gasket mounting portion 23a to which the gasket 4 of the exhaust pipe 20a is mounted toward the inner side in the axial direction. The taper is provided so that the protruding amount t from the inner peripheral surface 44 is reduced. Here, although the three ribs 45 are provided at equal intervals in the circumferential direction, at least one rib 45 may be provided along the axis O direction.

  4A is a side view of the gasket mounting portion 23a of the exhaust pipe 2a viewed from the end 20a side, and FIG. 4B is an axial sectional view of the gasket mounting portion 23a of the exhaust pipe 2a. .

  As shown in the drawing, the outer peripheral surface 21a of the gasket mounting portion 23a to which the gasket 4 of the exhaust pipe 2a is mounted is arranged on the outer peripheral surface of the gasket 4 from the end 20a inward in the axial direction along the axis O direction. A plurality of grooves 22a for accommodating the ribs 45 formed in the shaft 44 are formed. The groove 22a is set on the end 20a side of the exhaust pipe 2a to a depth d that forms a shimiro with the rib 45 formed on the inner peripheral surface 44 of the gasket 4 (see FIG. 1B). Here, although the three grooves 22a are provided at equal intervals in the circumferential direction, the number of grooves 22a corresponding to the ribs 45 formed on the inner peripheral surface 44 of the gasket 4 is provided along the axis O direction. Just do it.

  The first embodiment of the present invention has been described above.

  In the present embodiment, a rib 45 is formed on the inner peripheral surface 44 of the gasket 4 along the direction of the axis O, and a groove 22a for accommodating the rib 45 is formed on the outer peripheral surface 21a of the exhaust pipe 2a to which the gasket 4 is attached. Is formed inward in the axial direction from the end 20a along the axis O direction. For this reason, when the gasket 4 is attached to the exhaust pipe 2a, the rib 45 is accommodated in the groove 22a, so that the exhaust pipe is not increased without increasing the friction in the axis O direction when the gasket 4 is attached to the exhaust pipe 2a. The rotation of the gasket 4 attached to 2a can be prevented. Therefore, according to this embodiment, it is excellent in workability at the time of assembly, and it is possible to prevent the generation of noise due to the rotation of the gasket.

  In the present embodiment, the rib 45 formed on the inner peripheral surface 44 of the gasket 4 is tapered so that the protrusion amount t decreases from the small diameter side end surface 41 toward the large diameter side end surface 40. Further, the groove 22a formed on the outer peripheral surface 21a of the exhaust pipe 2a is set to a depth d that forms a rib 45 with the rib 45 on the end 20a side of the exhaust pipe 2a. For this reason, the gasket 4 can be easily attached to the exhaust pipe 2a, while the rib 45 reliably contacts the groove 22a on the end 20a side of the exhaust pipe 2a and is compressed and deformed. Can be prevented from falling off.

  In the present embodiment, a rib 45 having a taper is formed on the inner peripheral surface 44 of the gasket 4 so that the protruding amount t decreases from the small-diameter side end surface 41 toward the large-diameter side end surface 40. On the outer peripheral surface 21a of the pipe 2a, a groove 22 set to a depth d which becomes a rib 45 and a shimoshiro on the end 20a side of the exhaust pipe 2a is formed. However, the present invention is not limited to this.

  For example, on the outer peripheral surface 21a of the exhaust pipe 2a, a rib with a taper is formed so that the amount of protrusion from the outer peripheral surface 21a increases inward in the axial direction from the end 20a to which the gasket 4 is attached, On the inner peripheral surface 44 of the gasket 4, a groove that is set to a depth that can be squeezed with the rib on the large-diameter side end surface 40 side may be formed.

  Alternatively, on the outer peripheral surface 21a of the exhaust pipe 2a, a groove that is tapered so as to become shallower inward in the axial direction from the end 20a to which the gasket 4 is mounted is formed, and the inner peripheral surface 44 of the gasket 4 is You may form the rib set to the protrusion amount which becomes this groove | channel and squeeze on the large diameter side end surface 40 side.

  Alternatively, a groove that is tapered so as to become shallower from the small-diameter side end surface 41 toward the large-diameter side end surface 40 is formed on the inner peripheral surface 44 of the gasket 4, and the gasket 4 is mounted on the outer peripheral surface 21a of the exhaust pipe 2a. In the end portion 20a, a rib may be formed that is set to a protruding amount that becomes a groove and a squeeze.

<Second embodiment>
Next, a second embodiment of the present invention will be described.

  FIG. 5 (A) is a cross-sectional view of the spherical joint unit 1 ′ according to the second embodiment of the present invention, and FIG. 5 (B) is a section C of the spherical joint unit 1 ′ shown in FIG. 5 (A). 5C is an enlarged view, and FIG. 5C is an enlarged view of a D portion of the spherical joint unit 1 ′ shown in FIG. 5A. Here, components having the same functions as those of the spherical joint unit 1 shown in FIG.

  As shown in the figure, the spherical joint unit 1 ′ according to the present embodiment is different from the spherical joint unit 1 according to the first embodiment in that the exhaust pipe 2 ′ a and the gasket 4 are replaced with the exhaust pipe 2 a and the gasket 4. 'I have set up. Other configurations are the same as those of the spherical joint unit 1 according to the first embodiment.

  6A is a front view of the gasket 4 ′, FIG. 6B is an EE cross-sectional view of the gasket 4 ′ shown in FIG. 6A, and FIG. 6C is a gasket. 4 'is a rear view, and FIG. 6 (D) is an enlarged view of an F portion of the gasket 4 ′ shown in FIG. 6 (B). Here, components having the same functions as those of the gasket 4 shown in FIG.

  As described above, the gasket 4 ′ is a cylindrical body having the large-diameter side end surface 40, the small-diameter side end surface 41, and the spherical outer peripheral surface 42, and a reinforcing material such as a wire mesh and a heat-resistant material such as expanded graphite. It is formed by. Further, as shown in the drawing, a plurality of ribs 45 ′ are formed along the axis O direction on the small diameter side end surface 41 side of the inner peripheral surface 44 of the insertion hole 43 into which the exhaust pipe 2 ′ a is inserted. The rib 45 ′ is directed from the small-diameter side end surface 41 toward the large-diameter side end surface 40, that is, from the end 20 a of the gasket mounting portion 23 ′ to which the gasket 4 ′ of the exhaust pipe 20 ′ is mounted inward in the axial direction. Thus, the taper is provided so that the circumferential width h decreases. Here, the three ribs 45 'are provided at equal intervals in the circumferential direction, but at least one rib 45' may be provided along the axis O direction.

  7A is a side view of the gasket mounting portion 23′a of the exhaust pipe 2′a as viewed from the end 20a side, and FIG. 7A is a gasket mounting portion 23 ′ of the exhaust pipe 2′a. It is an axial sectional view of a. Here, components having the same functions as those of the exhaust pipe 2 shown in FIG.

  As shown in the drawing, on the outer peripheral surface 21a of the gasket mounting portion 23'a to which the gasket 4 'of the exhaust pipe 2'a is mounted, from the end 20a side toward the axially inward direction along the axis O direction, A notch 24 ′ a that fits with a rib 45 ′ formed on the inner peripheral surface 44 of the gasket 4 ′ is formed. The notch 24′a is formed in a triangular shape having a width j that is the same as the rib 45 ′ formed on the inner peripheral surface 44 of the gasket 4 ′ on the inner side in the axial direction, with the end 20a as the base. (See FIGS. 5B and 5C). Here, three notches 24'a are provided at equal intervals in the circumferential direction, but the number of notches 24'a corresponding to the ribs 45 'formed on the inner peripheral surface 44 of the gasket 4'. May be provided along the direction of the axis O.

  The second embodiment of the present invention has been described above.

  In the present embodiment, a rib 45 ′ is formed along the axis O direction on the inner peripheral surface 44 of the gasket 4 ′, and the rib 45 is formed on the end 20 a of the exhaust pipe 2 ′ to which the gasket 4 ′ is mounted. A notch 24'a that fits with 'is formed inward in the axial direction from the end 20a along the axis O direction. For this reason, when the gasket 4 'is mounted on the exhaust pipe 2'a, the rib 45' is fitted into the notch 24'a, so the axis O direction when the gasket 4 'is mounted on the exhaust pipe 2'a It is possible to prevent the rotation of the gasket 4 ′ attached to the exhaust pipe 2 ′ a without increasing the friction. Therefore, according to this embodiment, it is excellent in workability at the time of assembly, and it is possible to prevent the generation of noise due to the rotation of the gasket.

  Further, in the present embodiment, the rib 45 ′ formed on the inner peripheral surface 44 of the gasket 4 ′ is tapered such that the circumferential width h decreases from the small diameter side end surface 41 toward the large diameter side end surface 40. Is attached. In addition, the notch 24′a formed in the end portion 20a of the exhaust pipe 2′a is a rib 45 formed on the inner peripheral surface 44 of the gasket 4 ′ on the inner side in the axial direction with the end portion 20a as the bottom. It is formed in a triangular shape having a width j that becomes' and shimeshiro. For this reason, the gasket 4 ′ can be easily mounted on the exhaust pipe 2′a, while the rib 45 ′ reliably contacts the cutout 24′a on the inner side in the axial direction of the exhaust pipe 2′a and is compressed and deformed. As a result, it is possible to prevent the gasket 4 'from falling off the exhaust pipe 2'a.

  In the present embodiment, the notch 24′a formed in the end portion 20a of the exhaust pipe 2′a has the end portion 20a as the bottom, and the inner peripheral surface 44 of the gasket 4 ′ on the inner side in the axial direction. It is formed in a triangular shape having a width 45 to be a rib 45 'and a squeeze. However, the present invention is not limited to this. For example, the notch 24 ′ a may be formed in a trapezoidal shape having a width j that forms the bottom of the end 20 a and forms a rib 45 ′ and a squeeze on the inner side in the axial direction. Alternatively, for example, the notch 24 ′ a may be formed in a rectangular shape having a width that becomes a rib 45 ′ on the end 20 a side of the exhaust pipe 2 ′ a.

  Further, in the present embodiment, the rib 45 ′ formed on the inner peripheral surface 44 of the gasket 4 ′ is tapered such that the circumferential width h decreases from the small diameter side end surface 41 toward the large diameter side end surface 40. However, the present invention is not limited to this. A notch 24′a formed in the end 20a of the exhaust pipe 2′a has a triangular or trapezoidal shape with the end 20a as a base and a width j that is a squeezing rib 45 ′ on the inner side in the axial direction. If formed, the rib 45 'need not be tapered.

  In the present embodiment, the circumferential width h of the inner peripheral surface 44 of the gasket 4 ′ is axially inward from the end 20a where the gasket 4 ′ of the exhaust pipe 2′a is mounted. A decreasing rib 45 ′ is formed, and an outer peripheral surface 21 a of the exhaust pipe 2 ′ a is formed on the outer peripheral surface 21 a of the gasket 4 ′ on the outer side in the axial direction of the exhaust pipe 2 ′ a. A triangular or trapezoidal notch 24'a having a width j that forms a rib 45 'and a squeeze is formed inside. However, the present invention is not limited to this. On the outer peripheral surface 21a of the exhaust pipe 2'a, a rib that expands in the circumferential width h from the end 20a to which the gasket 4 'of the exhaust pipe 2'a is attached inward in the axial direction; On the inner peripheral surface of the gasket 4 ', the large-diameter side end surface 40 of the gasket 4' located in the axially inward direction of the exhaust pipe 2'a is used as a base, and a width j between the rib 4 and the inner surface of the gasket 4 ' A triangular or trapezoidal notch may be formed.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the gist.

  For example, in the above-described embodiment, the spherical joint unit that connects the exhaust pipe of an automobile has been described as an example, but the present invention is not limited to this. The present invention can be widely applied to a gasket unit including an exhaust pipe and a gasket attached to the exhaust pipe.

  1, 1 ′: spherical joint unit, 2a, 2′a, 2b: exhaust pipe, 3: flange, 4, 4 ′: gasket, 5: gasket seat with flange, 6: bolt with spring, 7: nut, 20a: Exhaust pipes 2a and 2'a, 20b: Exhaust pipe 2b, 21a: Exhaust pipes 2a and 2'a, 22a: Exhaust pipe 2a groove, 23a: Exhaust pipe 2a gasket mounting part 23'a: Gasket mounting portion of the exhaust pipe 2'a, 24'a: Notch of the exhaust pipe 2'a, 30: Bolt hole of the flange 3, 40: End face on the large diameter side of the gaskets 4, 4 ', 41 : Small-diameter side end surface 41 of gaskets 4 and 4 ', 42: outer peripheral surface of gaskets 4 and 4', 43: insertion hole of gaskets 4 and 4 ', 44: inner peripheral surface of insertion hole 43, 45 and 45': gasket 4, 4 'rib, 50: F Large diameter opening of Nji gasketed seat 5, 51: small-diameter opening of the flanged gasket seat 5, 52: inner peripheral surface of the flanged gasket seat 5, 54: flange, 55: Bolt hole of the flange 54

Claims (11)

A gasket unit comprising a gasket and an exhaust pipe to which the gasket is attached,
One of the inner peripheral surface of the gasket and the outer peripheral surface of the exhaust pipe has a rib formed along the axial direction, and the other has a groove formed along the axial direction and accommodating the rib. Gasket unit characterized by The gasket unit according to claim 1,
The rib is formed on the inner peripheral surface of the gasket, and the protruding amount of the rib decreases inward in the axial direction from the end of the exhaust pipe where the gasket is mounted,
The gasket unit is characterized in that, at an end portion of the exhaust pipe to which the gasket is mounted, the groove is set to a depth that forms a rib and the rib accommodated in the groove. The gasket unit according to claim 1,
The rib is formed on the outer peripheral surface of the exhaust pipe, and the protruding amount of the rib increases inward in the axial direction from the end of the exhaust pipe where the gasket is mounted,
The said groove is set to the depth used as the said rib accommodated in the said groove | channel at the edge part of the said gasket located in the axial direction inner side of the said exhaust pipe, The gasket unit characterized by the above-mentioned. The gasket unit according to claim 1,
The groove is formed on the outer peripheral surface of the exhaust pipe, and the depth of the groove becomes shallower inward in the axial direction from the end of the exhaust pipe where the gasket is mounted,
The said rib is set to the protrusion amount used as the said groove | channel which accommodates the said rib, and the projection amount in the edge part of the said gasket located in the axial direction inner side of the said exhaust pipe. The gasket unit according to claim 1,
The groove is formed on the inner peripheral surface of the gasket, and the depth of the groove becomes deeper inward in the axial direction from the end portion where the gasket of the exhaust pipe pipe is mounted,
The said rib is set to the protrusion amount which becomes the said groove | channel which accommodates the said rib at the edge part to which the said gasket of the said exhaust pipe is mounted | worn. A gasket unit comprising a gasket and an exhaust pipe to which the gasket is attached,
One of the inner peripheral surface of the gasket and the outer peripheral surface of the exhaust pipe has a rib formed along the axial direction, and the other is formed axially inward from the end along the axial direction, A gasket unit characterized by having a notch that fits into a rib. The gasket unit according to claim 6, wherein
The rib is formed on the inner peripheral surface of the gasket, and the circumferential width of the rib is narrowed inward in the axial direction from the end of the exhaust pipe where the gasket is mounted,
The notch is formed on the outer peripheral surface of the exhaust pipe, and has an end portion of the gasket located on the outer side in the axial direction of the exhaust pipe as a base, and has a width that forms the rib and the inner side of the gasket. A gasket unit characterized by having a triangular shape or a trapezoidal shape. The gasket unit according to claim 6, wherein
The rib is formed on the outer peripheral surface of the exhaust pipe, and the circumferential width of the rib extends inward in the axial direction from the end of the exhaust pipe where the gasket is mounted.
The notch is formed on the inner peripheral surface of the gasket, and has an end portion of the gasket positioned inward in the axial direction of the exhaust pipe as a base, and has a width that forms the rib and the inner side of the gasket. A gasket unit characterized by having a triangular shape or a trapezoidal shape. The gasket unit according to any one of claims 1 to 8,
The gasket unit includes a reinforcing material including a wire mesh and a heat-resistant material including expanded graphite. The gasket unit according to any one of claims 1 to 9,
The gasket unit has a spherical outer peripheral surface. A spherical joint unit that connects exhaust pipes,
The gasket unit according to claim 10,
Another exhaust pipe connected to the exhaust pipe of the gasket unit;
A spherical joint unit comprising: a gasket seat provided at an end of the other exhaust pipe and having a spherical inner peripheral surface that is in sliding contact with a spherical outer peripheral surface of the gasket of the gasket unit.

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