JP2768060B2 - Flexible pipe device for exhaust pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible pipe device used for a vehicle exhaust pipe.

[0002]

2. Description of the Related Art The present applicant has previously filed Japanese Utility Model Application No. 2-21.
As No. 841, a flexible pipe device for an exhaust pipe was proposed. As shown in FIG. 7, the exhaust pipe flexible pipe device has a first support cover 2 at one end of a bellows 1 and a second support cover 3 at the other end of the bellows.
Are fixed respectively, and the pin 4 is fixed to the first support cover 2.
And a cap 5 is attached to the second support cover 3, and is integrally formed from a wire mesh in a space formed between the first support cover to which the pins are attached and the second support cover to which the caps are attached. And a hat-shaped (hat-shaped hat-shaped) cushioning material 6 provided.

[0003]

However, in the structure of the hat-shaped cushioning material 6 described above, it is difficult to sufficiently secure the wire mesh density of the hat-shaped cylindrical portion at the time of press molding. Since the hat-shaped tubular portion is a portion used under the strictest conditions as a bearing, the lack of the density tends to cause the cylindrical portion to collapse and settle to the pin connecting portion due to settling.

An object of the present invention is to provide a flexible pipe device for an exhaust pipe having a wire mesh cushioning structure that can be formed with a sufficient density.

[0005]

According to the present invention, the above object is attained by providing an exhaust pipe flexible pipe device having the following means. A bellows having a first end and a second end, one end fixed to the first end of the bellows and the other end extending outside the bellows toward a second end of the bellows. A first support cover, a second support cover having one end fixed to the second end of the bellows and the other end extending outside the first support cover toward the first end of the bellows; The second support cover is attached to the first support cover, extends radially outward from the first support cover in a direction perpendicular to the bellows axis, and passes through a cutout formed in the second support cover. A pin having a cylindrical portion extending outward, a cap attached to the second support cover so as to cover the pin from outside the pin, and the first attached to the pin A cushioning member made of a wire mesh having a flange portion made of a wire mesh and a cylindrical portion provided in a space formed between the support cover and the second support cover to which the cap is attached and formed separately from each other. .

[0006]

In the flexible pipe device for an exhaust pipe according to the present invention, since the wire mesh of the flange portion and the wire portion is formed separately from each other, the wire wire mesh at the time of manufacturing is not pulled, so that the wire mesh is sufficiently dense and uniform. It is possible to form a tubular wire mesh into the tub. As a result, even if a large load is applied as the bearing cushioning material, no sag occurs and no backlash occurs.

[0007]

1 to 3 show a first embodiment (single type) of the present invention, and FIGS. 4 to 6 show a second embodiment (dual type) of the present invention. Members common to both embodiments are denoted by the same reference numerals.

First, the common configuration of both embodiments will be described. The exhaust pipe flexible pipe device generally includes a bellows 10, a first support cover 20, a second support cover 30, a pin 40, a cap 50, and a cushioning material 60. The bellows 10 has a first end 11, a second end 12 opposite to the first end, and a bellows portion 13 connecting the first and second ends. A first and a second end 11,
An exhaust pipe (not shown) is inserted into each of the pipes 12, and is fixed to the bellows by welding.

The first support cover 20 has a first end 21 and a second end 22 having a diameter larger than that of the first end 21.
And a large-diameter portion 23 connecting the first end 21 and the second end 22. The first end 21 of the first support cover 20 is fixed to the first end 11 of the bellows 10 and an exhaust pipe (not shown) by full-circumferential welding. The second end 22 of the first support cover 20 extends outside the bellows 10 toward the second end 12 of the bellows, and covers the bellows bellows 13 from the outer peripheral side. A pair of holes are formed in the first support cover 20 at positions corresponding to the outside of the bellows bellows portion 13 on an extension of the diameter of the bellows, and pins 40, 40 are inserted and fixed therein.

The second support cover 30 includes a first end 31 and a second end 32 having a diameter larger than that of the first end 31.
And a large-diameter portion 33 connecting the first end 31 and the second end 32. The first end 31 of the second support cover 30 is fixed to the second end 12 of the bellows 10 and an exhaust pipe (not shown) by full-circumferential welding. The second end 32 of the second support cover 30 extends outside the bellows 10 and outside the first support cover 20 toward the first end 11 of the bellows. The second end 32 of the second support cover 30 is connected to the first support cover 2.
The second end 22 of the first support cover 20 has a larger diameter than the second end 22 of the first support cover 20.

A pair of cutouts 34, 34 are formed in a portion of the second support cover 30 corresponding to the outside of the pin holes formed in the first support cover 20. As shown in FIG. 2, for example, the notch 34 extends from the end on the second end 32 side of the second support cover 30 to the first end 31.
Parallel notch 34a extending toward the side, and parallel notch 3
It has a shape in which a partial circular portion 34b having a diameter larger than the width of 4a is combined. A pin 40 is inserted into the partially circular portion 34b of the notch 34.
Is inserted. By providing the partial circular portion 34b having a diameter larger than that of the parallel notch portion 34a, when the cap 50 having the same outer diameter as the partial circular portion 34b is fitted into the partial circular portion 34b, the cap 50 moves in the direction of the parallel notch portion 34a. The displacement can be prevented, and the positioning of the cap 50 becomes easy.

The pin 40 comprises a flange 41 and a cylindrical portion 42. The opposite side of the cylindrical portion 42 from the flange 41 is open and has no bottom. With this bottomless structure, the length of the cylindrical portion 42 can be increased during pin molding, and the bearing area is increased to reduce the load applied to the cushioning material 60 per unit area. The pin 40 is inserted into the pin hole of the first support cover 20 from the inside, and the flange 41 is attached to the first support cover 20.
The first support cover 20 is in contact with the inner peripheral surface of the first support cover 20.
Is fixed by welding. The cylindrical portion 42 of the pin 40 extends outwardly through the pin hole of the first support cover 20, and further extends outwardly through the partially circular portion 34 b of the notch 34 of the second support cover 30 with play. . The outer diameter of the pin 40 is smaller than the width of the parallel portion 34a of the notch 34, and when the second support cover 30 and the first support cover 20 are assembled, the pin 40 is passed through the parallel portion 34a to the partial circular portion 34b. Insert the bellows in the axial direction.

The cap 50 has a cylindrical portion 51 and a bottom portion 52, and does not have a flange at the end of the cylindrical portion 51 opposite to the bottom portion 52. The cap 50 covers the pins 40 from the outside at intervals. The outer surface of the open end of the kip is fitted into the partial cylindrical portion 34b of the notch 34 of the second support cover 30, and the end surface of the cylindrical portion 51 is brought into contact with the flange of the cushioning material 60. 50 to the second support cover 30
And fixed by welding. Since the cap 50 has a structure without a flange, it can be inserted into the notch 34,
In addition, the length of the cylindrical portion 51 can be increased when the cap 50 is formed, and the surface pressure applied to the cushioning member 60 can be reduced.

The cushioning member 60 is provided in a space formed between the first support cover 20 to which the pin 40 is attached and the second support cover 30 to which the cap 50 is attached. The buffer material 60 is made of a wire mesh molding material,
It comprises a flange portion 61 and a cylindrical portion 62 formed separately from each other. The tubular portion 62 has no bottom and both ends are open. Since the flange portion 61 and the cylindrical portion 62 can be formed separately, there is no insufficient density and non-uniformity of the wire mesh due to pulling which occurs when the cylindrical portion is press-formed from the conventional plate-shaped mesh 2, A uniform wire mesh cylindrical portion 62 having a sufficient density can be manufactured. Further, since the cylindrical portion 62 can be formed separately from the flange portion 61, the length of the cylindrical portion 62 can be increased, the load receiving area can be increased, and the surface pressure can be reduced.

The flange 61 is disposed in an annular space between the outer surface of the first support cover 20 and the inner surface of the second support cover 30.
Is arranged in a cylindrical space formed between the inner peripheral surface and the inner peripheral surface. The cylindrical space is formed to have a sufficient length by forming the pin 40 and the cushioning material 60 without a bottom, so that the surface pressure of the cylindrical portion 62, which is the most severe condition for a bearing, can be sufficiently reduced.

The inner peripheral surface of the bellows 10 is provided with an upstream end, in the illustrated example, a second end, so that the exhaust gas flow does not receive flow resistance from the bellows bellows portion 13 which is uneven. A smooth straightening pipe 70 extending from 12 to a downstream end, in the illustrated example, a first end 11 is provided. The flow straightening tube 70 has one end fixed to the inner circumference of the upstream end of the bellows 10.

Next, different structures of each embodiment will be described. However, in the drawing, a suffix A is attached to a reference numeral for a structure unique to the first embodiment, and a suffix B is attached to a reference numeral for a structure unique to the second embodiment. In the first embodiment, as shown in FIGS. 1 to 3, the number of the bellows 10 is one, and the cross sections of the first and second support covers 20A and 30A are substantially circular. On the other hand, in the second embodiment, the number of bellows 10 is two as shown in FIGS.
The second support covers 20B, 30B have a substantially gourd-shaped cross section.

Next, the operation will be described. The load applied to the flexible pipe device is the first and second support covers 2
The bellows 10 is supported by the connection structure of the pins 0 and 30, so that an excessive load is not applied to the bellows 10. Pin 40
The connecting structure allows the flexible pipe device to flex
Connect two exhaust pipes. In addition, the first and second support covers 20 and 30 protect the bellows 10 from flying stones, road surface interference, salt damage caused by snow melting salt, and the like.

The load applied between the two exhaust pipes is
0, a cap 50, and a wire mesh cushioning member 60. The wire mesh cushioning member 60 has elasticity and functions as a cushion, and also functions as damping against vibration. By interposing the wire mesh cushioning member 60, direct contact between the pin 40 and the cap 50 and between the first support cover 20 and the second support cover 30 is eliminated, and generation of abnormal noise is eliminated. Further, since the cushioning member 60 is made of a wire mesh, no thermal problem occurs even when the cushioning member 60 is used for a connection structure of an exhaust pipe to which a relatively high temperature is applied.

In order to improve the reliability and durability of the bearing portion, the reliability and durability of the wire mesh cushioning material 60 itself are increased, and the bearing area is increased in order to reduce the load per unit area of the bearing. It is effective.

Conventionally, a wire mesh formed into a plate shape was press-formed to form a hat shape as shown in FIG. 7, but the wire mesh density of the cylindrical portion became low during manufacture, and it was used under the most severe conditions as a bearing. It was not possible to ensure a sufficient density of the cylindrical portion to be formed. However, in the present invention, since the flange portion 60a and the cylindrical portion 60b of the cushioning material 60 are formed separately, the cylindrical portion 60b can be manufactured by rolling a plate-shaped wire mesh, or can be manufactured by cutting a pipe-shaped wire mesh, It can be manufactured with sufficient density and uniform density.
Further, since there is no excessive molding as in the hat-shaped molding by pressing, there is no fraying of the wire mesh. As a result, the reliability and durability of the cushioning material 60 itself are enhanced.

Various configurations contribute to reducing the load per unit area of the bearing. The cushioning member 60 is made up of the cylindrical portion 62 and the flange portion 61.
Since the cylindrical portion 62 is formed separately, the cylindrical portion 62 can be made freely long without being restricted by the flange portion 61, and the bearing area can be increased. For example, in the case of a hat-shaped molding by pressing as in the past, the length of the cylindrical portion itself is also restricted, and the transition of the hat-shaped tip to the bottom plate and the transition to the flange are rounded. Although the cylindrical portion has been shortened by that amount, in the case of the present invention, there is no such restriction.

Further, the pin 40 is also changed from the conventional bottomed hat shape by deep drawing to the bottomless cylindrical portion 42 by flange forming of a pipe material. Therefore, the length of the cylindrical portion 42 can be increased, and the bearing area can be increased. Can be increased. Further, since the cap 50 is not flanged as in the prior art, the cylindrical portion 51 is not provided.
Can be made longer than before, and the bearing area can be increased. In other words, in the case of a cap having a flange portion as in the conventional case, the inner circumference of the flange is rounded, the wire mesh holding surface is partially missing over the entire circumference, and the cutout portion of the support cover is partially held. However, in the present invention, the cap 60 does not have a flange, and has an end abutting against the flange 61 of the cushioning material 60. Therefore, the wire mesh holding surface does not have a chip, and the bearing surface is not formed. Increase. These combined actions reduce the load per unit area of the bearing,
The reliability and durability of the bearing are improved.

[0024]

According to the present invention, the buffer member made of a wire mesh has a flange portion and a cylindrical portion, and the flange portion and the cylindrical portion of the buffer material are separately formed. The cylindrical portion can be manufactured with a sufficient and uniform wire mesh density, and the reliability and durability of the flexible pipe device, especially the bearing portion, can be enhanced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a flexible pipe device for an exhaust pipe according to a first embodiment of the present invention.

FIG. 2 is a plan view of the apparatus of FIG.

FIG. 3 is a front view of the apparatus of FIG. 1;

FIG. 4 is a side view showing a cross section of a part of a flexible device for an exhaust pipe according to a second embodiment of the present invention.

5 is a plan view, partially in section, of the device of FIG. 4;

6 is a front view of the device of FIG.

FIG. 7 is a cross-sectional view of a device according to a flexible pipe device for an exhaust pipe proposed in Japanese Utility Model Application No. 2-21841.

[Explanation of symbols]

 Reference Signs List 10 Bellows 11 First end of bellows 12 Second end of bellows 20 First support cover 30 Second support cover 34 Notch 34a Parallel part of notch 34b Partial circular part of notch 40 Pin 41 Pin flange 42 Cylindrical part of pin 50 Cap 51 Cylindrical part of cap 52 Bottom part of cap 60 Buffer material 61 Flange part of cushion material 62 Tube part of cushion material

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F01N 7/08 F16L 27/12

Claims (1)

(57) [Claims] 1. A bellows having a first end and a second end, and a second end of the bellows having one end fixed to the first end of the bellows and the other end outside the bellows. A first support cover extending toward the second end of the bellows and having a second end extending outside the first support cover toward the first end of the bellows. And a notch formed in the second support cover, which is attached to the first support cover and extends radially outward from the first support cover in a direction perpendicular to the bellows axis and in the second support cover. A pin having a cylindrical portion extending outside the second support cover, a cap attached to the second support cover so as to cover the pin from the outside of the pin, and a cap attached to the pin. A wire mesh that is provided in a space formed between the first support cover and the second support cover to which the cap is attached, and that has a flange portion and a cylindrical portion formed of wire meshes formed separately from each other; And a flexible pipe device for an exhaust pipe.