JPH078808Y2 - Pipe fitting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a flexible pipe joint device which is provided in an exhaust system of an automobile and connects, for example, a front exhaust pipe and a rear exhaust pipe.

[Conventional technology]

The exhaust system of an automobile is suspended from the vehicle body, and the front exhaust pipe forming part of the exhaust system is connected to the exhaust manifold of the engine. Therefore, especially in front-wheel drive vehicles,
The vibration of the engine is transmitted to the exhaust system, and the smoldering of the front exhaust pipe caused by the vibration is absorbed, so that a flexible pipe joint device is required in the middle of the exhaust system.

As this pipe joint device, a flexible tube and a spherical joint device are mainly known. The flexible tube requires a predetermined length in the axial direction of the exhaust pipe, occupies a large space, is not preferable in terms of layout, and is disadvantageous in that it is expensive.

On the other hand, as a spherical joint device, for example, the actual open sho 60-37693
The one shown in Japanese Patent Publication (shown in FIG. 3) is known.

This spherical joint device uses a spherical joint in a state where a pipe end 102 of a front exhaust pipe 101 and a pipe end 104 of a rear exhaust pipe 103, which are connected to an exhaust manifold (not shown) of an engine, are separated from each other. In addition, a support flange 105 is provided at the pipe end 102 of the front exhaust pipe 101, and a first seal bearing 106 having a spherical outer surface is provided at the pipe end 104 side of the rear exhaust pipe 103 of the support flange 105 to provide rear exhaust gas. The tube end 104 of the tube 103 is formed with a concave spherical surface portion 107 that makes spherical contact with the outer surface of the first seal bearing 106 and the connecting flange 108.
Fixing the connection flange 108 and the support flange 105 of the front exhaust pipe 101 via the spring 109 to the bolt 110 and the nut 11.
The ones are linked together.

In addition, as another example of the above-mentioned pipe coupling device, there are
The one shown in Japanese Patent Publication No. 21 is known.

This pipe joint device has a cylindrical wall 121A, 1
22A having an outward annular protruding wall 121B, 122B respectively provided between the overlapping portions of the cylindrical walls of the exhaust pipes 121, 122 in a state of initial pressure contact with a heat-resistant annular elastic seal member 123. The first coil spring member 125 having a circular cross-section is interposed, and the adjustment gap 124 is held on the outer side.
Both ends are fixed and connected to 122B respectively.
A separate second coil spring 12 having an inverted triangular cross-section that closely fits the outer peripheral portion of the first coil spring member 125 with the arc wall surface between the coil lines of the first coil spring member 125.
6 is fixed to the side of the first coil spring member 125 and adhered and polymerized to form a structure.

[Problems to be solved by the device]

However, in the pipe joint device using the spherical joint according to the former conventional example (Japanese Utility Model Publication No. 60-37693), the structure is simpler and cheaper than the flexible tube,
The front exhaust pipe 101 simply swings. Therefore, only the vibration in the bending direction can be absorbed with respect to the vibration in various directions of the engine, and the vibration in the axial direction of the front exhaust pipe 101 cannot be absorbed.

On the other hand, in the latter conventional example (Japanese Utility Model Laid-Open No. 62-43121), both exhaust pipes 121, 122 are opposed to each other via an annular elastic seal member 123 against vibration in various directions of the engine. It can be axially displaced and can absorb vibration in the axial direction, but it cannot absorb vibration in the bending direction.

Therefore, it is possible to absorb the vibration displacement only in the bending direction of the exhaust pipe or the vibration displacement only in the axial direction with respect to the vibration in various directions of the engine, but it is not possible to absorb both the vibration displacements at the same time.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a pipe joint device capable of simultaneously absorbing vibrational displacements in the bending direction and the axial direction.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a pipe joint device for connecting a pipe end of one pipe and a pipe end of the other pipe to each other, by providing a support flange at the pipe end of one pipe and A first seal bearing having a spherical outer surface is provided on the other pipe end side, a second seal bearing is provided on the pipe end of the other pipe, and a connecting flange is provided from the pipe end of one pipe to the pipe end of the other pipe. Arranging a connecting bracket having a concave spherical portion that makes spherical contact with the outer surface of the first seal bearing and a cylindrical portion that makes contact with the second seal bearing, providing a support member on the support bracket, and connecting the connection bracket to this support member The spring is attached to press the flange toward the support flange.

[Action]

In the present invention, the concave spherical portion of the connection bracket is pressed against the outer surface of the first seal bearing at the tube end of one tube by a spring, and, for example, the tube end of one tube generates a bending force due to engine vibration. When received, the outer surface of the first seal bearing at the tube end of one tube and the concave spherical surface portion of the connection bracket make spherical contact, and the tube end of the one tube swings.

Also, when the pipe end of one pipe receives an axial force in a direction away from the pipe end of the other pipe due to the vibration of the engine, the pipe end of the one pipe passes through the second seal bearing and the pipe end of the other pipe. It is also displaced axially with respect to the edge.

〔Example〕

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

FIG. 1 shows a pipe joint device according to a first embodiment of the present invention.

In the figure, 1 is a front exhaust pipe (one pipe) connected to an exhaust manifold (not shown) of the engine,
Reference numeral 2 is a rear exhaust pipe suspended from a vehicle body (not shown).
The pipe end 3 of the front exhaust pipe 1 and the pipe end 4 of the rear exhaust pipe 2 are separated.

A disc-shaped support flange 5 is fixed to the pipe end 3 of the front exhaust pipe 1 by welding, and a spherical first seal bearing 6 is fixed thereto. This first seal bearing 6
The support flange 5 is located on the pipe end 4 side of the rear exhaust pipe 2, and its outer surface 6A is formed in a spherical shape.

A cylindrical second seal bearing 7 is fixed to the pipe end 4 of the rear exhaust pipe 2.

Reference numeral 8 denotes a connection bracket, which is located from the pipe end 3 of the front exhaust pipe 1 to the pipe end 4 of the rear exhaust pipe 2, and has a connection flange 9 and a concave spherical portion 10 continuous with the connection bracket 9.
And a cylindrical portion 11 continuous with the concave spherical portion 10.
The connection flange 9 is formed in a disc shape and has a bolt hole 9A. The concave spherical surface portion 10 is the first seal bearing 6
It is designed to make spherical contact with the outer surface 6A of the cylindrical part 11
Is in surface contact with the outer surface 7A of the second seal bearing 7.

The connection flange 9 of the connection bracket 8 and the support flange 5 are connected via a compression spring 12 by a support member 15 composed of a bolt 13 and a nut 14.

Then, the connection bracket 8 is pressed by the compression spring 12 toward the pipe end 3 side of the front exhaust pipe 1. Therefore, the concave spherical surface portion 10 of the connecting bracket 8 is pressed against the outer surface 6A of the spherical first seal bearing 6 of the front exhaust pipe 1, and the pipe end 3 of the front exhaust pipe 1 is bent by the vibration of the engine. When received, the outer surface 6A of the first seal bearing 6 of the front exhaust pipe 1 and the concave spherical surface portion 10 of the connection bracket 8
The pipe end 3 of the front exhaust pipe 1 swings while and are in spherical contact.

Further, due to the vibration of the engine, the pipe end 3 of the front exhaust pipe 1 is
Axial direction (arrow A) away from the pipe end 4 of the rear exhaust pipe 2
, The bolt 13 attached to the support flange 5 of the front exhaust pipe 1 is displaced in the axial direction (arrow A) together with the connecting bracket 8, and the connecting bracket 8 moves on the second seal bearing 7 in the axial direction. . Therefore, the pipe end 3 of the front exhaust pipe 1 is axially displaced with respect to the pipe end 4 of the rear exhaust pipe 2. When the front exhaust pipe 1 returns to its original position due to the vibration of the engine, the connection bracket 8 also returns to its original position.

According to the configuration as described above, the pipe joint device according to the present embodiment has a so-called spherical joint structure that uses the spherical first seal bearing 6 and an axial displacement absorption structure that uses the second seal bearing 7. The spherical joint structure absorbs the displacement in the bending direction of the front exhaust pipe 1 caused by the vibration of the engine, and the axial displacement absorption structure can absorb the axial displacement. That is, the vibration displacement in the bending direction and the axial direction of the front exhaust pipe 1 can be simultaneously absorbed with respect to the vibration of the engine.
As a result, the strength can be improved without exerting an excessive force on the pipe joint device.

FIG. 2 shows a pipe joint device according to a second embodiment of the present invention.

Also in the second embodiment, similarly to the first embodiment, the support flange 5 and the first seal bearing 6 are provided at the pipe end 3 of the front exhaust pipe 1, and the second seal is provided at the pipe end 4 of the rear exhaust pipe 2. A bearing 7 is provided, and a connecting bracket 8 is arranged from the pipe end 3 of the front exhaust pipe 1 to the pipe end 4 of the rear exhaust pipe 2, and its structure is similar to that of the first embodiment.

Explaining the difference from the first embodiment, a bolt 23 is fixed to the support bracket 5 with a nut 22, and a disc-shaped fixed bracket 24 is attached to the pipe end 4 of the rear exhaust pipe 2. A first compression spring 25 is interposed between the fixed bracket 24 and the connection flange 9 of the connection bracket 8. The connection flange 9 is pressed toward the support flange 5 by the first compression spring 25, so that the concave spherical surface portion 10 of the connection bracket 8 is inserted into the first seal bearing 6.
Is pressed against the outer surface 6A.

A second compression spring 26 is provided outside the bolt 23, and the second compression spring 26 has a head 23A of the bolt 23.
It is mounted between the fixing bracket 24 and the fixing bracket 24. This second
The compression spring 24 moves the front exhaust pipe 1 by the vibration of the engine.
When the pipe end 3 of is displaced in the axial direction (direction of arrow A), the pipe end 3
Is to return to the original position.

According to the second embodiment, in addition to the effects of the first embodiment, the adhesion of the first seal bearing 6 can be improved.

[Effect of device]

As described above, the pipe joint device according to the present invention has both the so-called spherical joint structure that uses the first seal bearing and the axial displacement absorption structure that uses the second seal bearing. The generated bending displacement can be absorbed by the spherical joint structure, and the axial displacement can be absorbed by the axial displacement absorption structure. That is, it is possible to simultaneously absorb the vibration displacement in the bending direction and the axial displacement with respect to the vibration of the engine.

[Brief description of drawings]

FIG. 1 is a sectional view of a pipe joint device according to a first embodiment of the present invention. FIG. 2 is a sectional view of a pipe joint device according to a second embodiment of the present invention. FIG. 3 is a sectional view of the former pipe joint device in the related art. FIG. 4 is a sectional view of the latter pipe joint device in the related art. [Explanation of signs of main parts] 1 ... front exhaust pipe 2 ... rear exhaust pipe 3 ... pipe end 4 ... pipe end 5 ... support flange 6 ... first seal bearing 7 ... second seal bearing 8 ...... Connection bracket 9 ...... Connection flange 10 ...... Concave spherical surface part 11 ...... Cylindrical part 12 ...... Compression spring 13 ...... Bolt 14 ...... Nut 15 ...... Support member.

Claims (1)

[Scope of utility model registration request] 1. A pipe joint device for connecting a pipe end of one pipe and a pipe end of another pipe, wherein a support flange is provided on the pipe end of one pipe and an outer side is provided on the other pipe end side of the support flange. A first seal bearing having a spherical side surface is provided, a second seal bearing is provided at a pipe end of the other pipe, and the connecting flange and the outside of the first seal bearing are provided from a pipe end of one pipe to a pipe end of the other pipe. A connection bracket having a concave spherical surface portion that makes spherical contact with the side surface and a cylindrical portion that makes contact with the second seal bearing is provided, and a support member is provided on the support bracket. A pipe joint device comprising a spring for pressing.