JPH0510120A - Device for allowing movable connection to pipe part in exhaust pipe for automobile - Google Patents

Abstract

PURPOSE:To improve durability by eliminating directional property by which flexural rigidity is changed due to a direction in which a leading pipe part formed with bellows is curved. CONSTITUTION:In the outer circumference of a belows 2, outer cylinders 3, 4 are connected respectively to the end parts of the bellows 2 at intervals 9. Annular buffer cushion 10 is arranged on the outer circumference of the outer cylinders 3, 4. Two annular members 5, 6 are fixed on the outer cylinders 3, 4, and they are provided with many teeth 7, 8. The teeth 7, 8 are arranged at mutually equal intervals in circular direction and so as to grasp the buffer cushion 10 from the mutually opposite directions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a device for movably connecting pipe parts in an exhaust pipe of a motor vehicle.

[0002]

2. Description of the Related Art This type of device is used to buffer the relative motion between an engine and an exhaust pipe, and its structure is shown in FIGS. 4 (a) and 4 (b) (see Japanese Patent Laid-Open No. 59-46314). ).

At the end portion 114 of the bellows 111, which is connected to the pipe 112, one stamping member 121 is fixed so as to face each other with the diameter of the pipe 112, and this stamping member 121 is the bellows 111. One end 114
Slightly protruding in an S-shape from, and a pocket-shaped support portion 122 is fixed to the protruding end portion. Support part 12
2 is covered by a support portion 123.

The supporting portion 123 is fixed to another stamping member 124 having an S-shaped cross section, and this stamping member 1
24 is supported on the other end 117 of the bellows 111. A buffer cushion 126 having a through hole in the center is fitted into the support portion 122, and an additional portion 127 of the support portion 123 is projected into the through hole.

In this way, the cushion cushion 126 is housed in the pocket-shaped supporting portions 122 and 123,
It has a rectangular or oval or oval shape when viewed in a cross section perpendicular to the drawing. The cushion cushion 126 is made of a pressed metal wire, such as a pressed wire fabric made of wire mesh, entangled wire, or the like.

[0006]

SUMMARY OF THE INVENTION In the above conventional technique,
The bellows 111 bends relatively easily around the axis P-P of the cushion cushion 126. That is, in FIG. 4A, the axis A
The axis A-A of the bellows 111 is easily bent in a plane perpendicular to the plane of the drawing including -A. However, in FIG. 4B, the bellows 111 is difficult to bend within the plane of the drawing, and the bending rigidity changes extremely depending on the bending direction. Therefore, when it is mounted on a vehicle, the bending direction must be specified for assembly, and there is a problem that it is effective only for alleviating flexural vibration in a specific direction.

Further, in the exhaust pipe of an automobile, a large vibration load is applied to the cushion cushion 126 depending on road surface conditions and driving conditions. This load is supported by a cushion cushion 126 that is in contact with the tubular portion formed by the support portions 122 and 123. However, since the pressure receiving area of the cushion cushion 126 cannot be increased in the conventional structure, the surface pressure due to the vibration load increases, and There has been a problem that the cushion is worn or worn, and a gap is formed between the cushion cushion 126 and the support portions 122 and 123, and durability is reduced.

Furthermore, when an automobile runs on a road surface on which an antifreezing agent such as rock salt is sprayed, and the antifreezing agent is splashed on the underside of the floor of the automobile, the antifreezing agent will pass through the through holes of the addition portion 127. 127a or through the through hole 122a of the support portion 122 and adheres to the outer periphery of the bellows 111. Further, once it enters, it is difficult to be discharged, so the attached antifreezing agent is overheated by the exhaust heat, and the solid content adheres to the valley of the bellows 111.
There is a problem that the bellows are accumulated to significantly deteriorate the expansion and contraction / flexibility of the bellows and accelerate the corrosion of the bellows.

Therefore, an object of the present invention is to solve the problems of the prior art and to provide a rational device for movably connecting an exhaust pipe portion of an automobile.

[0010]

To achieve the above object, a device for movably connecting a pipe portion in an automobile exhaust pipe according to the present invention is for movably connecting the pipe portion in an automobile exhaust pipe. Device of at least one flexible conduit section (2), such as a corrugated tube, a metal tube, or the like, and a conduit section (2) each coupled to an end of the conduit section (2). One outer cylinder (3) arranged on the outer circumference and facing each other with a gap (9) therebetween.
(4), an annular cushioning cushion (10) arranged around the outer circumference of the outer cylinders (3) and (4), and the cushioning cushion (10) in the circumferential direction so that the cushioning cushions (10) are grasped from opposite directions. A plurality of claws (7) and (8) alternately arranged at equal intervals and two annular members (5) and (6) fixed to the two outer cylinders (3) and (4) are provided. It is characterized by

[0011]

The cushioning cushion (10) uniformly cushions the bending of the flexible conduit portion (bellows) regardless of the bending direction. It also has the same rigidity against axial compression or tension of the bellows.

Further, the outer cylinders (3) and (4) contact each other when the bending, compression or tension of the bellows exceeds a certain level to prevent an excessive force from being applied to each part of the device. The ring-shaped cushioning cushion (10) is held by the outer cylinders (3) and (4) on the inner circumference and the plurality of claws (7) and (8) on the side and outer circumferences.
The contact area with the outer cylinders (3) and (4) and the claws (7) and (8) is large, so that the surface pressure acting on the cushion (10),
Shear stress can be reduced.

Furthermore, the outer cylinders (3) and (4) and the ring (5).
(6) and cushion (10) are bellows (2)
Completely covers the outer circumference of the bellows to prevent the antifreezing agent and earth and sand from adhering to the outer circumference of the bellows (2).

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in FIGS. 1 (a) and 1 (b), 1 is an exhaust gas conduit, one end (left end) of which is fitted and fixed to the inner circumference of the left end of a bellows 2 which functions as a flexible conduit part. There is. Outer cylinders 3 and 4 are attached to the outer circumference of the bellows 2 so that one ends are fixed to the ends of the bellows 2 and the other ends face each other with a gap 9 therebetween.

Numerals 5 and 6 are annular members, each of which has a cylindrical flange portion fitted to the outer cylinder 3 or 4 on one side and a plurality of claw portions 7 and 8 on the opposite side. The cushion cushion 10 is integrally formed so as to grasp the cushion cushion 10. Nine claws 7 and 8 are provided on the circumference at equal intervals.

The annular members 5 and 6 are arranged in combination so that the claw portions 7 and 8 are located at positions (between) that are opposite to each other, and are formed between the annular members 5 and 6. The cushioning cushion 10 is fitted in a space which is substantially annular as a whole, and the annular member 5,
The claw portions 7 and 8 of FIG.
In (a), they are coaxially assembled so that they can be grasped from the left and right in opposite directions.

Then, the outer cylinders 3 and 4 fixed to the exhaust gas conduit 1 and the bellows pipe 2 are inserted into this assembly,
The flange portions of the annular members 5 and 6 are fixed to the outer cylinders 4 and 3, respectively. At this time, the inner peripheral surface of the cushion cushion 10 is held by the outer peripheral surfaces of the outer cylinders 3 and 4 except for the gap 9.
The left and right side surfaces and the outer peripheral surface are held by the claw portions 7 and 8.

The cushioning cushion uses a well-known cushioning cushion made of a pressed metal wire made of stainless steel wire mesh, entangled wires and the like. With the above configuration, when the bellows 2 bends, the outer cylinders 3, 4, the annular members 5, 6 and the claws 7, 8 move closer to each other inside the bend, and conversely move away from each other outside the bend. To move. Therefore, at this time, the buffer cushion 10 is deformed according to the degree of bending of the bellows 2 by applying a force in a direction such that the cushion cushion 10 is sheared by the portions not constrained by the claw portions 7 and 8.

Further, since the cushion cushion 10 is formed by compression-molding a known metal wire, the elastic deformation amount of the cushion cushion 10 cannot be adjusted according to the required bending angle of the bellows 2 and the required bending rigidity of the entire device. It's extremely easy.

The present apparatus has an annular cushion 1
Since 0 is gripped and a large number of claws 7 and 8 are evenly arranged on the circumference at equal intervals, the bending rigidity of the device is practically uniform regardless of the bending direction of the bellows. ..

The gap 9 between the outer cylinders 3 and 4 is an appropriate value so that the bellows 9 may be bent, or the outer cylinders 3 and 4 may contact each other with a certain amount of deformation or more, so that an excessive force is not applied to each part of the apparatus. Is set to.

[0022]

Since the device for movably connecting the pipe parts in the exhaust pipe for automobiles of the present invention is constructed as described above, the bending of the bellows as the flexible conduit part can be performed in any direction. Since the bending rigidity is uniform,
There is no need to consider the directionality when mounting on a car,
Easy to handle.

Further, there is a feature that the bellows have the same rigidity against axial compression or tension. Also, the outer cylinder (3) (4)
With the large deformation of the bellows, the gap (9) disappears and the bellows come into contact with each other, so that it is possible to prevent an excessive force from being applied to each part of the device and prevent damage.

Further, since the surface pressure and the shear stress applied to the cushioning cushion (10) are small, it is possible to prevent the rattling of the cushioning cushion and the like, and to prevent the generation of abnormal noise and to improve the durability. Great effect can be obtained.

Furthermore, adhesion of antifreezing agents and earth and sand to the bellows is prevented, deterioration of the rigidity and corrosion of the bellows are prevented, and durability is also improved in this respect.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention, in which (a) is (b).
3A is a cross-sectional view taken along line AA, and FIG.

FIG. 2 is a vertical cross-sectional view of a conventional technique, in which (a) is Xa of (b).
-Xa line sectional drawing, (b) is Xb-Xb of (a).
Sectional view along the line.

[Explanation of symbols]

 2 Conduit part (bellows) 3,4 Outer cylinder 5,6 Annular member 7,8 Claw 9 Gap 10 Cushion cushion

Claims (1)

Claim: What is claimed is: 1. A device for movably connecting pipe sections in an exhaust pipe of a motor vehicle, wherein the corrugated tube, the metal tube, or at least one flexible conduit section similar thereto. (2) and one outer cylinder (3) (4) which is connected to the end of the conduit portion (2) and is disposed on the outer periphery of the conduit portion (2) and faces each other with a gap (9).
An annular cushion (10) arranged around the outer circumferences of the outer cylinders (3) and (4), and the cushion (1)
0) is provided with a large number of claws (7) (8) arranged alternately at equal intervals in the circumferential direction so as to be gripped from opposite directions and fixed to the two outer cylinders (3) (4). Device for movably connecting pipe parts in an automobile exhaust pipe, characterized in that it comprises two annular members (5), (6).