CN107709849B

CN107709849B - Gasket assembly and spherical joint assembly

Info

Publication number: CN107709849B
Application number: CN201680034687.8A
Authority: CN
Inventors: 贝田英俊; 佐藤荣治; 若松勇志; 吉田敦史; 西谷洋佐
Original assignee: Oyles Industrial Co ltd
Current assignee: Oyles Industrial Co ltd
Priority date: 2015-06-24
Filing date: 2016-06-20
Publication date: 2020-12-22
Anticipated expiration: 2036-06-20
Also published as: JP6594055B2; JP2017009076A; CN107709849A; WO2016208549A1

Abstract

The invention provides a gasket assembly and a spherical joint assembly which have excellent assembly workability and can prevent abnormal noise. Spherical joint assembly (1) for an exhaust system of a motor vehicle, equipped with: 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), a gasket seat (5) with a flange attached to the exhaust pipe (2b), and a bolt (6) and a nut (7) with a spring that connect the exhaust pipes (2a, 2 b). A rib (45) is formed on the inner peripheral surface (44) of the gasket (4) along the axis O direction. 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, from the end (20a) inward in the axial direction along the axis O direction.

Description

Gasket assembly and spherical joint assembly

Technical Field

The present invention relates to a gasket assembly for an exhaust pipe equipped with a gasket and a mounted gasket, and more particularly to a gasket assembly for a spherical joint suitable for connecting exhaust pipes of automobiles to each other.

Background

In the past, in an exhaust system of an automobile, exhaust pipes were connected to each other by a spherical joint, and vibration transmitted from an engine to the exhaust pipes was attenuated by the spherical joint, and transmission of such vibration to a vehicle body was suppressed. Patent document 1 discloses a gasket suitable for a spherical joint for connecting exhaust pipes of automobiles to each other.

Such a gasket (a spherical strip seal) is a cylindrical body having a spherical outer peripheral surface, is attached to an end of one exhaust pipe to be connected, and is in sliding contact with a spherical inner peripheral surface of a gasket seat (a concave spherical seal seat) provided at an end of the other exhaust pipe. Further, 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. Therefore, when the gasket is attached to the exhaust pipe, the rib reliably contacts the exhaust pipe, preventing the gasket from falling off the exhaust pipe. Therefore, according to the gasket described in patent document 1, the workability of mounting the gasket to the exhaust pipe can be improved.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2014-185648

Disclosure of Invention

Problems to be solved by the invention

However, due to vibrations transmitted from the engine to the exhaust pipe, vibrations transmitted from the road surface to the exhaust pipe via the vehicle body during running, and the like, stresses in various directions are applied to the exhaust assembly. When 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 the spherical joint described in patent document 1, in order to solve this problem, it is necessary to increase the number of ribs formed on the inner peripheral surface of the gasket, or to form the ribs with a heat-resistant material having a higher hardness, thereby increasing the frictional force in the circumferential direction of the gasket attached to the exhaust pipe. However, the frictional force in the axial direction when the gasket is attached to the exhaust pipe is increased along with this. As a result, a high pressure must be applied by a tool such as an impact tool in order to attach the gasket to the exhaust pipe, and workability in assembling the gasket to the exhaust pipe deteriorates.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a gasket assembly and a spherical joint assembly which are excellent in workability at the time of assembly and can prevent the occurrence of abnormal noise.

Means for solving the problems

In order to solve the above problem, according to the present invention, a rib is formed along an axial direction on one of an inner peripheral surface of a gasket and an outer peripheral surface of an exhaust pipe to which the gasket is attached. On the other circumferential surface, a groove for accommodating the rib is formed along the axial direction, or a notch for fitting the rib is formed inward from the end portion along the axial direction.

For example, the present invention is a gasket assembly equipped with 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 peripheral surface has a groove formed along the axial direction for accommodating the rib.

Alternatively, the present invention is a gasket assembly equipped with 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 peripheral surface has a notch formed inward from an end portion along the axial direction and fitted to the rib.

In addition, the present invention is a spherical joint assembly for connecting exhaust pipes to each other, comprising:

the gasket assembly;

an additional exhaust pipe connected to the exhaust pipe of the gasket assembly; and

and a gasket seat provided at an end of the other exhaust pipe and having a spherical inner peripheral surface in sliding contact with a spherical outer peripheral surface of the gasket unit.

ADVANTAGEOUS EFFECTS OF INVENTION

In the present invention, a rib is formed in 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, and a groove for accommodating the rib is formed in the axial direction on the other peripheral surface, or a notch for fitting the rib is formed inward from the end in the axial direction. Therefore, the rib is received in the groove or fitted into the notch, so that the rotation of the gasket attached to the exhaust pipe can be prevented without increasing the friction force in the axial direction when the gasket is attached to the exhaust pipe. Therefore, according to the present invention, workability in assembling is excellent, and occurrence of abnormal noise can be prevented.

Drawings

Fig. 1(a) is a sectional view of a spherical joint assembly 1 according to a first embodiment of the present invention, and fig. 1(B) is an enlarged view of a portion a of the spherical joint assembly 1 shown in fig. 1 (a).

Fig. 2 is a diagram for explaining the operation principle of the spherical joint assembly 1.

Fig. 3(a) is a front view of the gasket 4, fig. 3(B) is a sectional view B-B of the gasket 4 shown in fig. 3(a), and fig. 3(C) is a rear view of the gasket 4.

Fig. 4(a) is a side view of the gasket mounting portion 23a of the exhaust pipe 2a as viewed from the end portion 20a side, and fig. 4(B) is an axial direction sectional view of the gasket mounting portion 23a of the exhaust pipe 2 a.

Fig. 5(a) is a sectional view of a spherical joint assembly 1 ' according to a second embodiment of the present invention, fig. 5(B) is an enlarged view of a portion C of the spherical joint assembly 1 ' shown in fig. 5(a), and fig. 5(C) is an enlarged view of a portion D of the spherical joint assembly 1 ' shown in fig. 5 (a).

Fig. 6(a) is a front view of the gasket 4 ', fig. 6(B) is a cross-sectional view E-E of the gasket 4' shown in fig. 6(a), fig. 6(C) is a rear view of the gasket 4 ', and fig. 6(D) is an enlarged view of a portion F of the gasket 4' shown in fig. 6 (B).

Fig. 7(a) is a side view of the gasket mounting portion 23 'a of the exhaust pipe 2' a as viewed from the end portion 20a side, and fig. 7(B) is an axial direction sectional view of the gasket mounting portion 23 'a of the exhaust pipe 2' a.

Detailed Description

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 explained.

Fig. 1(a) is a sectional view of a spherical joint assembly 1 according to the present embodiment, and fig. 1(B) is an enlarged view of a portion a of the spherical joint assembly 1 shown in fig. 1 (a).

The spherical joint assembly 1 according to the present embodiment is used for an exhaust system of an automobile. As shown, the spherical joint assembly 1 is equipped with: 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, a flanged gasket seat 5 attached to the exhaust pipe 2b, and a bolt 6 and a nut 7 with a spring connecting the

exhaust pipes

2a, 2 b.

The flange 3 is attached to the exhaust pipe 2a, and is fixed to the exhaust pipe 2a by welding or the like at a position inward in the axial direction of the gasket 4 in the axial O direction from the end 20a of the exhaust pipe 2a by a length L. Further, bolt holes 30 for inserting the bolts 6 with springs are formed in the flange 3.

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, and is attached to the exhaust pipe 2a such that the large-diameter side end surface 40 abuts the flange 3 and the small-diameter side end surface 41 is flush with the end 20a of the exhaust pipe 2a or protrudes beyond the end 20 a. The gasket 4 is made of a reinforcing material such as a metal mesh and a heat-resistant material such as expanded graphite.

The flanged gasket seat 5 has: 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, a cylindrical portion 53 formed integrally with the small diameter opening 51 along the axis O direction and into which the exhaust pipe 2b is inserted, and a flange 54 formed integrally with the large diameter opening 50 radially outward from the large diameter opening 50. The cylindrical portion 53 is fixed to the exhaust pipe 2b by welding or the like in a state where the small-diameter opening portion 51 is attached to the exhaust pipe 2b so as to be flush with the end portion 20b of the exhaust pipe 2b or to protrude from the end portion 20 b. Bolt holes 55 for inserting bolts 6 with springs are formed in the flange 54.

The spring bolt 6 is screwed to the nut 7 through the bolt hole 30 of the flange 3 and the bolt hole 55 of the flange 54, thereby biasing the spherical outer peripheral surface 42 of the gasket 4 in a direction of pressing against the spherical inner peripheral surface 52 of the flanged gasket seat 5, and connecting the

exhaust pipes

2a and 2 b.

By connecting the

exhaust pipes

2a and 2b by the bolts 6 with springs and the nuts 7, 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. The maximum static friction force of the spherical outer peripheral surface 42 of the spacer 4 and the spherical inner peripheral surface 52 of the flanged spacer 5 which are in contact with each other is determined by the frictional characteristics of the outer peripheral surface 42 and the inner peripheral surface 52 and the biasing force (the force pressing the outer peripheral surface 42 against the inner peripheral surface 52) generated by the spring bolt 6 and the nut 7.

In the spherical joint module 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 integrally formed with the exhaust pipe 2 a. 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 integrally formed with the exhaust pipe 2 b.

As shown in the drawing, when a bending moment equal to or greater than a torque T (a torque having a center C of a ball defined by the inner circumferential surface 52 as a rotation center) is generated so that a maximum static friction force is generated between the outer circumferential surface 42 of the spacer 4 and the inner circumferential surface 52 of the flanged spacer 5 which are in contact with each other, the spherical joint assembly 1 slips. This can attenuate the vibration transmitted from the exhaust pipe 2a on the engine side to the exhaust pipe 2b on the rear muffler side.

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

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 formed of a reinforcing material such as a metal mesh and a heat-resistant material such as expanded graphite. As shown in the drawing, a plurality of ribs 45 are formed along the axis O direction on the inner circumferential surface 44 of the insertion hole 43 into which the exhaust pipe 2a is inserted. The rib 45 is tapered such that the amount of projection t from the inner peripheral surface 44 of the gasket 4 decreases 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 of the mounted gasket 4 of the exhaust pipe 2a toward the inside in the axial direction. Here, 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.

As shown in the drawing, a plurality of grooves 22a are formed in the outer peripheral surface 21a of the gasket mounting portion 23a of the mounted gasket 4 of the exhaust pipe 2a from the end portion 20a toward the inside in the axial direction along the axis O direction, and the grooves 22a receive ribs 45 formed on the inner peripheral surface 44 of the gasket 4. The groove 22a is set to a depth d (see fig. 1B) on the end 20a side of the exhaust pipe 2a, which is set to interfere with the rib 45 formed on the inner circumferential surface 44 of the gasket 4. Here, although the three grooves 22a are provided at equal intervals in the circumferential direction, the number of grooves 22a corresponding to the number of ribs 45 formed on the inner circumferential surface 44 of the gasket 4 may be provided along the axis O direction.

The first 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 a groove 22a for accommodating the rib 45 is formed along the axis O direction from the end portion 20a toward the axial direction inner side on the outer peripheral surface 21a of the exhaust pipe 2a to which the gasket 4 is attached. Therefore, when the gasket 4 is attached to the exhaust pipe 2a, the rib 45 is accommodated in the groove 22a, and therefore, the rotation of the gasket 4 attached to the exhaust pipe 2a can be prevented without increasing the frictional force in the axis O direction when the gasket 4 is attached to the exhaust pipe 2 a. Therefore, according to the present embodiment, workability in assembly is excellent, and generation of abnormal noise accompanying rotation of the spacer can be prevented.

In the present embodiment, the ribs 45 formed on the inner peripheral surface 44 of the gasket 4 are tapered such that the projection amount t decreases from the small-diameter side end surface 41 toward the large-diameter side end surface 40. The groove 22a formed in the outer peripheral surface 21a of the exhaust pipe 2a is set to a depth d that interferes with the rib 45 on the end 20a side of the exhaust pipe 2 a. Therefore, the gasket 4 can be easily attached to the exhaust pipe 2a, and on the other hand, the rib 45 is reliably brought into contact with the groove 22a on the end portion 20a side of the exhaust pipe 2a and is compressively deformed, whereby the gasket 4 can be prevented from coming off the exhaust pipe 2 a.

In the present embodiment, the rib 45 is formed on the inner peripheral surface 44 of the gasket 4, the rib 45 is tapered such that the projection amount t decreases from the small-diameter side end surface 41 to the large-diameter side end surface 40, the groove 22 is formed in the outer peripheral surface 21a of the exhaust pipe 2a, and the groove 22 is set to the depth d of interference with the rib 45 on the end portion 20a side of the exhaust pipe 2 a. However, the present invention is not limited thereto.

For example, a rib may be formed on the outer peripheral surface 21a of the exhaust pipe 2a, the rib being tapered such that the amount of protrusion from the outer peripheral surface 21a increases from the end 20a of the mounted gasket 4 inward in the axial direction, and a groove set to a depth that is a degree of interference with the rib may be formed on the inner peripheral surface 44 of the gasket 4 on the large-diameter side end surface 40 side.

Alternatively, a groove tapered so as to be shallower inward in the axial direction from the end portion 20a of the attached gasket 4 may be formed in the outer peripheral surface 21a of the exhaust pipe 2a, and a rib set to a protruding amount with respect to the groove in the large-diameter side end surface 40 side may be formed in the inner peripheral surface 44 of the gasket 4.

Alternatively, a groove tapered so as to be shallower from the large-diameter side end surface 40 toward the small-diameter side end surface 41 may be formed in the outer peripheral surface 44 of the gasket 4, and a rib set to a protruding amount with respect to the groove in an interference manner may be formed in the outer peripheral surface 21a of the exhaust pipe 2a at the end portion 20a of the mounted gasket 4.

< second embodiment >

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

Fig. 5(a) is a sectional view of a spherical joint assembly 1 ' according to a second embodiment of the present invention, fig. 5(B) is an enlarged view of a portion C of the spherical joint assembly 1 ' shown in fig. 5(a), and fig. 5(C) is an enlarged view of a portion D of the spherical joint assembly 1 ' shown in fig. 5 (a). Here, the same reference numerals are given to portions having the same functions as those of the spherical joint assembly 1 shown in fig. 1.

As shown in the drawing, the spherical joint assembly 1 ' according to the present embodiment is different from the spherical joint assembly 1 according to the first embodiment in that an exhaust pipe 2 ' a and a gasket 4 ' are provided instead of the exhaust pipe 2a and the gasket 4. The other structure is the same as that of the spherical joint assembly 1 according to the first embodiment.

Fig. 6(a) is a front view of the gasket 4 ', fig. 6(B) is a cross-sectional view E-E of the gasket 4' shown in fig. 6(a), fig. 6(C) is a rear view of the gasket 4 ', and fig. 6(D) is an enlarged view of a portion F of the gasket 4' shown in fig. 6 (B). Here, the same reference numerals are given to portions having the same functions as those of the gasket 4 shown in fig. 3.

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 formed of a reinforcing material such as a metal mesh and a heat-resistant material such as expanded graphite. 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 tapered such that its width h in the circumferential direction decreases from the small-diameter side end surface 41 toward the large-diameter side end surface 40, that is, from the end 20a of the gasket mounting portion 23' a of the mounted gasket 4 'of the exhaust pipe 20' a toward the inside in the axial direction. Here, 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.

Fig. 7(a) is a side view of the gasket mounting portion 23 'a of the exhaust pipe 2' a as viewed from the end portion 20a side, and fig. 7(B) is an axial direction sectional view of the gasket mounting portion 23 'a of the exhaust pipe 2' a. Here, the same reference numerals are given to portions having the same functions as those of the exhaust pipe 2 shown in fig. 4.

As shown in the drawing, on the outer peripheral surface 21a of the gasket attachment portion 23 ' a of the attached gasket 4 ' of the exhaust pipe 2 ' a, a notch 24 ' a is formed from the end portion 20a side toward the inside in the axial direction along the axis O direction, and the notch 24 ' a is fitted with a rib 45 ' formed on the inner peripheral surface 44 of the gasket 4 '. The notch 24 ' a has a triangular shape having the end 20a as a base and a width j that is set to interfere with the rib 45 ' formed on the inner peripheral surface 44 of the gasket 4 ' on the axially inner side (see fig. 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 number of ribs 45 'formed on the inner circumferential surface 44 of the spacer 4' may be provided along the axis O direction.

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

In the present embodiment, the inner peripheral surface 44 of the gasket 4 'is formed with a rib 45' along the axis O direction, and the end portion 20a of the exhaust pipe 2 'a to which the gasket 4' is attached is formed with a notch 24 'a along the axis O direction from the end portion 20a inward in the axial direction, which is fitted to the rib 4'. Therefore, when the gasket 4 'is attached to the exhaust pipe 2' a, the rib 45 'is fitted into the notch 24' a, and therefore, the rotation of the gasket 4 'attached to the exhaust pipe 2' a can be prevented without increasing the frictional force in the axis O direction when the gasket 4 'is attached to the exhaust pipe 2' a. Therefore, according to the present embodiment, workability in assembly is excellent, and generation of abnormal noise accompanying rotation of the spacer can be prevented.

In the present embodiment, the rib 45 'formed on the inner peripheral surface 44 of the gasket 4' is tapered such that the width h in the circumferential direction thereof decreases from the small-diameter-side end surface 41 to the large-diameter-side end surface 40. The slit 24 'a formed in the end portion 20a of the exhaust pipe 2' a is formed in a triangular shape having the end portion 20a as a base and a width j that interferes with the rib 45 'formed on the inner peripheral surface 44 of the gasket 4' on the axially inner side. Therefore, the gasket 4 ' can be easily attached to the exhaust pipe 2 ' a, and on the other hand, the rib 45 ' is reliably brought into contact with the notch 24 ' a on the axially inner side of the exhaust pipe 2 ' a and is compressed and deformed, whereby the gasket 4 ' can be prevented from coming 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 is formed in a triangular shape having the end portion 20a as a base and having a width j that interferes with the rib 45 'formed on the inner peripheral surface 44 of the gasket 4' on the axially inner side. However, the present invention is not limited thereto. For example, the cutout 24 'a may be formed in a trapezoidal shape having the end 20a as a base and a width j that interferes with the rib 45' on the axially inner side. Alternatively, for example, the cutout 24 ' a may be formed in a rectangular shape having a width that interferes with the rib 45 ' on the end portion 20a side of the exhaust pipe 2 ' a.

In the present embodiment, the rib 45 'formed on the inner peripheral surface 44 of the gasket 4' is tapered such that the width h in the circumferential direction thereof decreases from the small-diameter-side end surface 41 to the large-diameter-side end surface 40. When the cutout 24 'a formed in the end portion 20a of the exhaust pipe 2' a is formed in a triangular shape or a trapezoidal shape having the end portion 20a as a base and having a width j that interferes with the rib 45 'on the axially inner side, the rib 45' may not be tapered.

In the present embodiment, the inner peripheral surface 44 of the gasket 4 'is formed with a rib 45' whose circumferential width h decreases from the end 20a of the exhaust pipe 2 'a to which the gasket 4' is attached toward the inside in the axial direction, and the outer peripheral surface 21a of the exhaust pipe 2 'a is formed with a notch 24' a having a triangular shape or a trapezoidal shape with the small-diameter side end 41 of the gasket 4 'located outward in the axial direction of the exhaust pipe 2' a as a base and having a width j that interferes with the rib 45 'on the inside of the gasket 4'. However, the present invention is not limited thereto. A rib whose circumferential width h is expanded inward in the axial direction from the end 20a of the exhaust pipe 2 ' a to which the gasket 4 ' is attached may be formed on the outer circumferential surface 21a of the exhaust pipe 2 ' a, and a notch having a triangular shape or a trapezoidal shape having a width j that interferes with the rib on the inner side of the gasket 4 ' with the large-diameter side end surface 40 of the gasket 4 ' located inward in the axial direction of the exhaust pipe 2 ' a as a base may be formed on the inner circumferential surface of the gasket 4 '.

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

For example, in the above-described embodiment, the spherical joint assembly connecting the exhaust pipes of the automobile is described as an example, but the present invention is not limited to this. The present invention can be widely applied to a gasket assembly equipped with an exhaust pipe and a gasket mounted to the exhaust pipe.

Description of the reference numerals

1. 1': spherical joint assembly, 2a, 2' a, 2 b: exhaust pipe, 3: flange, 4': gasket, 5: flanged gasket seat, 6: bolt with spring, 7: nut, 20 a: end portions of the exhaust pipes 2a, 2' a, 20 b: end of exhaust pipe 2b, 21 a: outer peripheral surfaces of exhaust pipes 2a ', 2' a, 22 a: groove of exhaust pipe 2a, 23 a: gasket mounting portion of exhaust pipe 2a, 23' a: gasket mounting portion of exhaust pipe 2 'a, 24' a: cutout of exhaust pipe 2' a, 30: bolt holes of flange 3, 40: large-diameter side end faces of the gaskets 4, 4', 41: small-diameter side end faces of the gaskets 4, 4', 42: outer peripheral surfaces of the gaskets 4, 4', 43: insertion holes of the spacers 4, 4', 44: inner peripheral surface, 45' of insertion hole 43: ribs of the gasket 4, 4', 50: large-diameter opening of flanged gasket seat 5, 51: small-diameter opening portion of flanged gasket seat 5, 52: inner peripheral surface of the flanged gasket seat 5, 54: flange, 55: bolt holes of the flange 54.

Claims

1. A gasket assembly equipped with 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 peripheral surface has a groove formed along the axial direction and receiving the rib,

the rib is formed on the inner peripheral surface of the gasket, the protruding amount of the rib is reduced from the end of the exhaust pipe to which the gasket is attached to the axial direction inward,

the groove is set to a depth that interferes with the rib accommodated in the groove at the end of the exhaust pipe to which the gasket is attached.

2. The gasket assembly of claim 1,

the gasket is composed of a reinforcing material containing a metal mesh and a heat-resistant material containing expanded graphite.

3. The gasket assembly of claim 1,

the pad has a spherical outer peripheral surface.

4. The gasket assembly of claim 2,

the pad has a spherical outer peripheral surface.

5. A spherical joint assembly interconnecting exhaust pipes, characterized by being provided with:

a gasket assembly of claim 3;

another exhaust pipe connected to the exhaust pipe of the gasket assembly; and

and 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 unit.

6. A spherical joint assembly interconnecting exhaust pipes, characterized by being provided with:

the gasket assembly of claim 4;

another exhaust pipe connected to the exhaust pipe of the gasket assembly; and