JP3371440B2 - Spherical fitting - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spherical pipe joint for connecting an exhaust pipe of an automobile.

[0002]

2. Description of the Related Art For example, exhaust gas of an automobile engine is guided to an exhaust pipe arranged in a vehicle body and released into the atmosphere. In the middle of this exhaust pipe, engine vibration is transmitted through the exhaust pipe. A spherical exhaust pipe joint is arranged to prevent transmission to the silencer side. This spherical exhaust pipe joint is generally one flange fixed to the end of one pipe connected to the engine side and the other flange provided to the end of the other pipe connected to the silencer side. An elastic connecting means for elastically connecting the flanges to each other at two portions in the circumferential direction of the pipe, a spherical band-shaped seal body attached to one end of the pipe, and the other end of the pipe. And a seal seat having a concave spherical seal seat surface on which the convex spherical seal surface of the spherical band seal body is seated, and the other pipe is swingably connected to one pipe.

[0003]

By the way, in such a conventional spherical exhaust pipe joint, the transmission of low-frequency vibration with large amplitude in one pipe connected to the engine side to the other pipe can be temporarily reduced. However, at the time of this reduction, when the other tube relatively swings with respect to one tube, the concave spherical seal seat surface of the seal seat slides relative to the convex spherical seal surface of the spherical seal body. . This sliding is generally accompanied by sticking slip (stick slip), and this sticking slip causes new vibration in the seal seat. This vibration has a relatively high frequency (about 1 kHz), and it is transmitted as an abnormal sound in the automobile, which is extremely annoying to passenger cars and the like that require quietness. It should be noted that such a problem does not occur only in the spherical exhaust pipe joint, but may occur in a general spherical pipe joint.

The present invention has been made in view of the above points, and it is an object of the present invention to reduce the vibration generated in the seal seat due to the adhered slip, thereby eliminating the generation of abnormal noise. It is to provide a spherical pipe joint to be obtained.

[0005]

According to the present invention, the above-mentioned object is achieved by one flange fixed to the end of one pipe, a seal seat formed at the end of the other pipe, and a seal seat. Outside
The other flange that is integrally extended in one direction and a convex spherical sealing surface that has a shape complementary to the concave spherical sealing seat surface of the seal seat and is in contact with the sealing seat surface. The seal body mounted on the end of one pipe between the seat and the one flange, and the two flanges are elastically connected to each other at the two axially symmetric parts, and the seal surface of the concave spherical surface of the seal seat is A pair of elastic connecting means that elastically presses the convex spherical sealing surface of the seal body, and a pair of elastic connecting members in the circumferential direction of both pipes.
Between the connecting means, at the folded-back part of the outer edge of the other flange
With attached, it is achieved by sealing seat mechanical spherical pipe joint that has and a tuned dynamic absorber to damp and vibration absorbing it to vibration.

In one embodiment, the dynamic vibration absorber according to the present invention includes a mass body and an elastic damping material that elastically and movably connects the mass body to the seal seat and damps vibrations of the mass body. In another example, a mass body, a spring body that elastically and movably connects the mass body to a seal seat, and a damping material that damps vibrations of the mass body are provided. In the example, the mass body and the sliding frictional resistance that damps the vibration of the mass body by the displacement based on the vibration of the mass body,
It has a spring body that is held and elastically and movably connects the mass body to the seal seat, but it goes without saying that the present invention is not limited to these examples. In a preferred example, the mass body comprises a cylindrical body formed of lead or iron or the like, or a combination body of bolts and nuts, and the elastic damping material is a metal wire mesh tubular body, a metal wire. Mesh disc,
The damping material comprises a damping steel plate or at least two leaf springs superposed on each other, while the damping material comprises a metal wire mesh tubular body, a metal wire mesh disc body or a damping steel plate, and the spring body is It is provided with a leaf spring or a coil spring.

[0007]

In the present invention, the vibration of one of the tubes is damped by the inventive spherical tube joint arranged between the two tubes and its transmission to the other tube is restricted. The vibration of the seal seat due to the sliding of the concave spherical seal seat surface against the convex spherical seal surface in the relative swing of the other pipe with respect to the one pipe is absorbed by the dynamic vibration absorber connected to the seal seat. It

The present invention will now be described in more detail based on the preferred embodiments shown in the drawings. The present invention is not limited to these specific examples.

[0009]

SPECIFIC EXAMPLE The spherical exhaust pipe joint 1 of this example shown in FIGS. 1 and 2 as a spherical pipe joint has one flange, one flange welded to the end portion 3 of the exhaust pipe 2 on the engine side in this example. Four
And a seal seat 7 provided on the other pipe, in this example, the end portion 6 of the exhaust pipe 5 on the muffler side, the other flange 8 integrally extended outward from the seal seat 7, and a seal. The exhaust pipe has a convex spherical seal surface 10 having a shape complementary to the concave spherical seal seat surface 9 of the seat 7 and in contact with the seal seat surface 9, and between the seal seat 7 and the flange 4. The flanges 4 and 8 are elastically connected to each other at at least two portions in the circumferential direction of the exhaust pipes 2 and 5, that is, at two axially symmetric portions in this example, and the seal body 11 attached to the end portion 3 of the exhaust pipe 2. Seal seat 7
Elastic connecting means 12 and 13 formed by elastically pressing the convex spherical sealing surface 10 of the seal body 11 against the concave spherical sealing seat surface 9 of the above, and the elastic connecting means 12 in the circumferential direction of the exhaust pipes 2 and 5. 13 is attached to the flange 8 and is connected to the seal seat 7, and includes dynamic vibration absorbers 14 and 15 tuned to absorb and damp mechanical vibration of the seal seat 7. ing.

The seal seat 7 is fixed to the end portion 6 of the exhaust pipe 5 at its annular end 21 by welding or the like . The seal seat 7 and the flange 8 of this example are integrally formed from sheet metal by press working as shown in FIGS. 3 to 5, and as apparent from FIG. 4, the plane shape is elliptical as a whole. There is.

The large-diameter end surface 25 of the seal body 11 is closely contacted with the flange 4 and fitted and attached to the end portion 3.
As the seal body 11, for example, JP-A-54-76759 is used.
It is preferable to use a material obtained by reinforcing a refractory material containing at least one of expanded graphite and mica disclosed in Japanese Patent Laid-Open Publication No. 10-29100 with a wire mesh.

The elastic connecting means 12 and 13 are similarly formed, respectively, and extend between the both flanges 4 and 8 through a hole 31 formed in the flange 8, and a threaded portion 32 at one end is formed on the flange 4. And a bolt 34 having a bulge head 33 for receiving a spring at the other end and one end 35 having a bulge head 33.
, The other end 36 abuts the flange 8 and the bolt 34
Respectively, and a coil spring 37 disposed around the coil spring 37. The coil spring 37 elastically presses the convex spherical seal surface 10 of the seal body 11 against the concave spherical seal seat surface 9 of the seal seat 7. Has been done.

The dynamic vibration absorbers 14 and 15 are also formed in the same manner, and the cylindrical body 41 made of a material having a relatively large mass such as lead or iron as a mass body, and the cylindrical body 41 are elastically attached to the seal seat 7. And the cylindrical body 41
Each of the metal wire mesh tubular bodies 42 and 43 is provided with two freely compressible and recoverable metal wire mesh tubular bodies 42 and 43 as elastic damping materials for damping the vibration of The cylindrical body 41 and the metal wire mesh tubular bodies 42 and 43, which are sandwiched and arranged, are L-shaped attached by a bolt 44 penetrating therethrough and a nut 45 screwed into one end of the bolt 44. Each of the mounting members 46 is attached to the member 46 and is fixed to the folded portion 47 of the flange 8 at one end by means such as welding. In this way, the folded portion 47 on the outer edge of the flange 8 is attached.
The attached dynamic vibration absorbers 14 and 15 of the present example are respectively connected to the seal seat 7 via the flange 8. The cylindrical body 41 is attached to the bolt 44 so as to be movable in the axial direction of the pipes 2 and 5 with respect to the flange 8, that is, in the A direction,
In order to elastically restrict the movement of the cylindrical body 41 in the A direction,
Two metal wire mesh tubular bodies 42 and 43 are provided with the cylindrical body 41 in between and the enlarged head 48 of the bolt 44 and the mounting member 4 are provided.
It is arranged between 6 and. Metal wire mesh tubular body 4
Nos. 2 and 43 are metal wires, for example, stainless steel wire, galvanized iron wire, etc. Woven or knitted, which is obtained by weaving or knitting a metal wire mesh into a tubular shape to form a tubular body. It is preferably compressed.

Spherical exhaust pipe joint 1 thus formed
, When relative angular displacement to the exhaust pipe 2 for the exhaust pipe 5 by the vibration of the engine (swing) occurs, the exhaust by the sliding of the seal member 11 on the concave spherical sealing seat surface 9 of the sealing seat 7 This relative angular displacement of the pipe 2 is reduced and its transmission to the exhaust pipe 5 is restricted. In other words, the spherical exhaust pipe joint 1 allows relative angular displacement of the exhaust pipe 2 with respect to the exhaust pipe 5.

Here, the concave spherical seal seat surface 9 and the convex spherical seal surface 10 slide relative to each other with sliding friction resistance in the above relative angular displacement. This is generally accompanied by sticky slip (sticky slip), and this sticky slip tends to generate new vibration in the seal seat 7, but the seal seat 7 of the present example has dynamic absorbers 14 and 15 via the flange 8.
Is provided, the vibration is generated by the dynamic vibration absorbers 14 and 1.
5 is transmitted to the cylindrical body 41, and the cylindrical body 41 also tries to vibrate in the A direction, but the vibration of the cylindrical body 41 causes the metal wire mesh tubular bodies 42 and 43 to be compressed and restored, and at this time, Due to the friction generated inside the bodies 42 and 43, the vibration energy is dissipated as heat energy and attenuated. Therefore, the spherical exhaust pipe joint 1 does not generate any abnormal noise due to the vibration of the seal seat 7. It should be noted that the nut 45 is rotated at a position where the vibration absorbing effect is maximized by rotating the nut 45.
Should be fixed.

In the above specific example, the cylindrical body 41 is movably mounted in the direction A, which is a direction parallel to the axes of the tubes 2 and 5, but as shown in FIG. It may be provided on the folded portion 47 of the flange 8 so as to be movable in the direction B, which is a direction perpendicular to the direction. In this case, as shown in the drawing, the folded portion 4 of the flange 8 is directly used without using the L-shaped mounting member 46.
The dynamic vibration absorbers 14 and 15 may be attached to the device 7.

In both the example shown in FIGS. 1 and 2 and the example shown in FIG. 6, the combination of the bolt 44 and the nut 45 is
Like the cylindrical body 41, it is relatively movable with respect to the flange 8 in the A direction (in the example shown in FIGS. 1 and 2) or in the B direction (in the example in FIG. 6). In the case of the devices 14 and 15, the combination of the bolt 44 and the nut 45 may be fixedly fixed to the flange 8. When the combined body of the bolt 44 and the nut 45 is movably provided with respect to the flange 8, the combined body of the bolt 44 and the nut 45 together with the cylindrical body 41 may be omitted from the dynamic vibration absorbers 14 and 15. It may be a mass body, and when the cylindrical body 41 is omitted, the metal wire mesh tubular bodies 42 and 43 are used.
It is advisable to integrate them and arrange them between the enlarged head portion 48 of the bolt 44 and the mounting member 46 or the folded portion 47. Further, in the dynamic vibration absorbers 14 and 15, the metal wire mesh tubular bodies 42 and 43 are used as the elastic damping material, but instead of this, the compression restoration manufactured in the same manner as the metal wire mesh tubular bodies 42 and 43 is performed. A free metal wire mesh disc may be used.

Further, as shown in FIG.
At one end 52 of a spring plate 51 as a spring body that is elastically and movably connected to each other, two holed metal wire mesh disk bodies 55 and 56 as a damping material for damping the vibration of the mass body are provided with bolts 53 and nuts 54. And the other end 57 of the spring plate 51 with a bolt 58 and a nut 59.
The dynamic vibration reducer 60 may be provided on the folded-back portion 47 of FIG. In this case, the combined body of the bolt 53 and the nut 54 functions as a mass body, and the combined body of the bolt 53 and the nut 54 as the mass body is attached to the one end 52 of the spring plate 51 and the metal wire mesh disk bodies 55 and 56. On the other hand, bolts 53 are arranged so as to penetrate therethrough so as to be movable in the B direction. The metal wire mesh disks 55 and 56 are
It is manufactured in the same manner as the metal wire mesh tubular bodies 42 and 43 except that compression molding is performed into a disk shape. In the dynamic vibration reducer 60 of this example, the vibration of the seal seat 7 is caused by the flange 8 and the leaf spring 5.
1 is transmitted to the combined body of the bolt 53 and the nut 54, and the combined body of the bolt 53 and the nut 54 is about to swing in the C direction about the other end 57.
By this swinging, the vibration of the combination of the bolt 53 and the nut 54 with respect to the leaf spring 51 in the B direction compresses and restores the metal wire mesh disc bodies 55 and 56, and at this time, occurs inside the metal wire mesh disc bodies 55 and 56. Friction causes the vibration energy to be dissipated as heat energy and attenuated.

In the dynamic vibration reducer 60 of this embodiment, a cylindrical body made of lead, iron or the like, which is the same as the cylindrical body 41, may be movably arranged between the metal wire mesh disk bodies 55 and 56. In this case, the bolt 53 may be fixedly fixed to the one end 52 of the leaf spring 51. Further, it goes without saying that the metal wire mesh disk bodies 55 and 56 may be replaced with those equivalent to the metal wire mesh tubular bodies 42 and 43. Further, the leaf spring 51 may be made of metal or rubber, but a coil spring may be used instead of the leaf spring 51 or together with the leaf spring, and the leaf spring 51 is a single piece as shown in the drawing. Alternatively, two or more sheets may be overlapped with each other, and the dynamic vibration absorber 60 may be formed by using a damping steel plate instead of the leaf spring. When using the vibration damping steel plates or a plurality of leaf springs that are superposed on each other as described above, the metal wire mesh disks 55 and 56 can be omitted because they can function as elastic vibration damping materials.

In the dynamic vibration reducer 70 shown in FIG. 8, one end of the bolt 73 is arranged by penetrating the hole 72 of the L-shaped mounting member 71 fixed at the folded portion 47 of the flange 8 by welding or the like. A coil spring 75 is arranged between a nut 74 and a mounting member 71, which are screwed together, and another coil spring 77 is arranged between the enlarged head 76 of the bolt 73 and the mounting member 71. In the dynamic vibration reducer 70 of this example, the combination of the bolt 73 and the nut 74 functions as a mass body,
The coil springs 75 and 77 function as a spring body, and the coil springs 75 and 77 have a sliding frictional resistance with the nut 74, the mounting member 71, and the enlarging head 76 that dampen the vibration of the combination of the bolt 73 and the nut 74. Each is held as it occurs between. Therefore, the bolt 73 and the nut 74
The combination with and is movable in the A direction with respect to the seal seat 7, and the vibration of the seal seat 7 causes the flange 8 and the coil spring 7
A vibration in the direction A is generated in the combination of the bolt 73 and the nut 74 via 5 and 77, and in this vibration, the coil spring 75 is mounted between both ends of the coil spring 75 and the nut 74 and the mounting member 71 and both ends of the coil spring 77. Sliding occurs between the member 71 and the enlarged head 76, and the sliding frictional resistance in this sliding is A of the combination of the bolt 73 and the nut 74.
The vibration energy in the direction is dissipated as heat energy and attenuated. In order to dissipate the vibration energy as heat energy as quickly as possible and to damp it, both ends of the coil springs 75 and 77 and the nut 74,
A damping material such as the metal wire mesh disk bodies 55 and 56 may be arranged as a coil spring receiver between the mounting member 71 and the enlarged head 76. Further, the metal wire mesh cylinder 42
Similarly to the coil springs 75 and 77, the elastic dampers are surrounded by or surrounded by the coil springs 75 and 77 between the nut 74 and the mounting member 71 and between the enlarged head 76 and the mounting member 71. Alternatively, the coil springs 75 and 77 may be provided instead. Further, the coil springs 75 and 77 may be non-linear coil springs, and in this example, the spring body may be a cylindrical rubber member or an annular plate spring. Further, as the mass body, a cylindrical body formed of lead, iron or the like may be provided so as to be sandwiched by the coil springs 75 and 77 which are divided.

Further, as shown in FIG. 9, the other end 8 of the mounting member 82 whose one end 81 is fixed to the folded-back portion 47 of the flange 8.
Metal wire mesh disk bodies 84 and 85 are arranged as elastic damping materials on both sides of 3, and a combination body of a bolt 86 and a nut 87 that also functions as a mass body that is movable in the B direction with respect to the mounting member 82 is provided. The dynamic vibration reducer 90 may be formed so as to be held at the end 83. As is the case with other examples, it goes without saying that either one of the metal wire mesh disk bodies 84 and 85 may be provided, or three or more layers may be provided. The mounting member 82 may be formed of a rigid body when the metal wire mesh disc bodies 84 and 85 are to function as elastic damping materials, but the mounting member 82 may be formed to function as a damping material when it functions as a damping material. Is formed from a spring plate or the like so as to function as a spring body.

Although two dynamic vibration absorbers are symmetrically provided in the above-mentioned example, the present invention is not limited to this, and may be one or a large number of three or more. In addition, the actual development Sho 58-13461
The present invention may be applied to the spherical pipe joint disclosed in Japanese Patent Publication No.

[0023]

According to the present invention, the dynamic vibration reducer is installed from the seal seat.
Because it is provided in the other flange which is integrally extended outward, results due to adhesion slippage due to relative angular displacement of the two pipe may attenuate the new vibration of the seal seat, the spherical pipe abnormal sound based on the vibration of the seal seat of the joint may effectively eliminated. In other words, according to the invention, a machine with a sealing seat
It is tuned to absorb and damp it
Dynamic vibration absorber is installed in a pair of elastic
Between the connecting means, at the folded-back part of the outer edge of the other flange
Since it is installed, the vibration of the seal seat is directly transmitted.
At the other flange reached with a dynamic vibration absorber
As a result of damping the vibration, the system of spherical pipe fittings
It is possible to effectively eliminate the abnormal noise due to the vibration of the seat. Also
According to the present invention, both flanges are connected to each other at two axially symmetrical parts.
A pair of elastic connecting means that are elastically connected to each other.
The vibration absorber on the outer edge of the other flange.
The outer edge of the flange, which is a free end because it is attached
Vibration of the spherical pipe joint can be effectively damped.
Only effective to eliminate noise caused by vibration of Leo
Not absorb the mechanical vibration of the seal seat.
Dynamic absorbers tuned to dampen
Between the pair of elastic coupling means in the other direction
Since it is attached to the folded part of the outer edge of the
The vibration absorber absorbs the mechanical vibration of the seal seat
It ’s tuned to dampen, so
Compared with the one that damps the vibration,
Motion can be damped, and
Combined with the above, the abnormal noise due to the vibration of the seal seat is further effective.
Can be lost.

[Brief description of drawings]

FIG. 1 is a sectional view of a preferred embodiment of the present invention,
1. It is the II sectional view taken on the line shown in FIG.

FIG. 2 is a sectional view taken along the line II-II of the specific example shown in FIG.

3 is a sectional view taken along the line III-III shown in FIG. 4 of the integral body of the seal seat and the flange shown in FIG.

FIG. 4 is a plan view of an integral body of the seal seat and the flange shown in FIG.

5 is a cross-sectional view taken along line VV shown in FIG. 4 of an integrated body of the seal seat and the flange shown in FIG.

FIG. 6 is a partial cross-sectional view of another preferred embodiment of the present invention.

FIG. 7 is a partial cross-sectional view of still another preferred embodiment of the present invention.

FIG. 8 is a partial cross-sectional view of still another preferred embodiment of the present invention.

FIG. 9 is a partial cross-sectional view of still another preferred embodiment of the present invention.

[Explanation of symbols]

1 Spherical exhaust pipe fitting 2, 5 exhaust pipe 4, 8 flange 7 seal seat 9 Concave spherical seal bearing surface 10 Convex spherical sealing surface 11 Seal body 12, 13 Elastic connection means 14,15 Dynamic vibration absorber

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiyuki Nishio 8 Kirihara-cho, Fujisawa-shi, Kanagawa Oiles Industry Co., Ltd. (72) Inventor Ma Miyashita 8-Kirihara-cho, Fujisawa-shi, Kanagawa Oise Co., Ltd. (56) References JP-A-1-301915 (JP, A) JP-A-3-156118 (JP, A) Actually developed 59-28623 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) ) F01N 7/08 F16L 15/06 F16L 23/02 F16L 23/032 F16L 27/04 F16L 27/06

Claims (11)

(57) [Claims] 1. A and one flange secured to an end portion of one tube, a seal seat formed in an end portion of the other pipe, Sea
The other flange integrally extended outward from the seat ,
A convex spherical seal surface having a shape complementary to the concave spherical seal seat surface of the seal seat and in contact with the seal seat surface,
A seal body mounted on the end of one pipe between the seal seat and one flange, and both flanges elastically connected to each other at two axially symmetrical parts, and a concave spherical seal seat surface of the seal seat A pair of elastic coupling means that elastically presses the convex spherical sealing surface of the seal body, and one in the circumferential direction of both pipes.
Fold the outer edge of the other flange between the pair of elastic coupling means.
Ri together are attached to barb, the sealing seat of the mechanical tuned dynamic absorber and the spherical pipe joint that has been provided with a to attenuate by vibration absorbing it to vibration. 2. The dynamic vibration reducer comprises a mass body, and an elastic damping material that elastically and movably connects the mass body to a seal seat and damps vibration of the mass body. The described spherical pipe joint. 3. The spherical pipe joint according to claim 2, wherein the mass body comprises a cylindrical body formed of lead, iron or the like, or a combination body of bolts and nuts. 4. The elastic damping material according to claim 2, wherein the elastic damping material comprises a metal wire mesh tubular body, a metal wire mesh disk body, a damping steel plate, or at least two leaf springs that are superposed on each other. Spherical pipe fitting. 5. The dynamic vibration reducer includes a mass body, a spring body that elastically and movably connects the mass body to a seal seat, and a damping material that damps vibrations of the mass body. The spherical pipe fitting described in. 6. The spherical pipe joint according to claim 5, wherein the mass body comprises a cylindrical body formed of lead, iron or the like, or a combination body of bolts and nuts. 7. The spherical pipe joint according to claim 5, wherein the spring body comprises a leaf spring or a coil spring. 8. The spherical pipe joint according to claim 5, wherein the damping material comprises a metal wire mesh tubular body, a metal wire mesh disc body or a damping steel plate. 9. The dynamic vibration reducer comprises a mass body and a spring body that elastically and movably connects the mass body to the seal seat.
The spherical pipe joint according to claim 1, wherein the spring body is held so that sliding friction resistance that damps vibrations of the mass body is generated. 10. The spherical pipe joint according to claim 9, wherein the mass body comprises a cylindrical body formed of lead, iron or the like, or a combination body of bolts and nuts. 11. The spherical pipe joint according to claim 9, wherein the spring body comprises a leaf spring or a coil spring.