JPH09133276A - Pipe body connecting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a seal member in the structure for connecting a first pie bodies and second pipe bodies each other by inserting a seal part, which is formed in an end of the second pipe body, into the first pipe body deeper than a first projecting part for the seal of the internal fluid. SOLUTION: A first and a second pipe bodies 21, 23 to be connected to each other are made of metal such as stainless steel, and, for example, to be used for an exhaust pipe, in which the exhaust gas of an engine is flowed, and the first pipe body 21 is formed at a diameter larger than that of the second pipe body 21 by the nearly thickness thereof. An end of the first pipe body 21 is formed with an annular first projecting part 21a having the semicircular cross section, and an end of the second pipe body 23 is formed with a seal part 23a to be inserted in the first pipe body 21 deeper than the projecting part 21a of the first tubular body 21. A connecting means formed of a pair of half clamp members 27 is arranged outside of both the projecting parts 21a, 23a so as to connect both the pipe bodies 21, 23.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a first tube and a second tube.
The present invention relates to a tube connecting structure for mutually connecting the tube and the tube.

[0002]

2. Description of the Related Art Conventionally, the connection between pipes such as the connection between exhaust pipes has been disclosed, for example, in JP-A-55-1261.
This is carried out by using the connecting structure of the pipe body as disclosed in Japanese Patent Publication No. 84. FIG. 7 shows a connecting structure of a pipe body disclosed in this publication, in which the connecting structure of the pipe body is
The end portion 13a of the second tubular body 13 to the end portion 11a of the tubular body 11 of
a is inserted.

The first tubular body 11 and the second tubular body 13 are formed with a first projecting portion 11b and a second projecting portion 13b which project outward. An elastic seal member 15 is interposed between the first protruding portion 11b of the first tube body 11 and the tip of the second tube body 13. An annular clamp member 17 is arranged outside the first protruding portion 11b and the second protruding portion 13b, and the first protruding portion 11 is formed by locking portions 17a formed on both edges of the clamp member 17.
b and the second protruding portion 13b are sandwiched and fixed.

[0004]

However, in such a conventional connecting structure for a pipe body, the first pipe body 11 has
Since the elastic seal member 15 is interposed between the projecting portion 11b and the tip of the second tube body 13 to prevent the internal fluid from leaking to the outside, it is very necessary to install the elastic seal member 15. There is a problem that the number of steps is required and that the elastic seal member 15 may deteriorate due to long-term use and the sealing performance may be impaired.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to provide a connecting structure for a pipe body which can eliminate the need for a seal member.

[0006]

According to a first aspect of the present invention, there is provided a pipe connecting structure for connecting a first pipe and a second pipe to each other. A first projecting portion formed at an end portion of the tubular body so as to project outward, and a rear side of the first projecting portion of the first tubular body formed at an end portion of the second tubular body. A seal part that is inserted up to and including a second projecting part, which is formed so as to project outward toward the rear of the seal part of the second tubular body and is in contact with the end of the first tubular body. Connection means arranged outside the first protrusion and the second protrusion to prevent relative movement of the first protrusion and the second protrusion in the axial direction. Characterize.

According to a second aspect of the present invention, in the connecting structure for the tubular body according to the first aspect, the connecting means bolts a pair of half-clamping members arranged outside the first and second protrusions. And a nut, and the first protrusion and the second protrusion are sandwiched by claw portions formed on both edges of the half clamp member.
According to a third aspect of the present invention, in the connection structure for a pipe body according to the first or second aspect, the seal portion is thin, and a reinforcing portion for reducing deformation of the seal portion is formed at a tip of the seal portion. It is characterized by being

According to a fourth aspect of the present invention, in the connecting structure for a pipe body according to any one of the first to third aspects, the reinforcing portion is formed by a curl portion formed by curling the tip of the seal portion inward. Characterize.

According to a fifth aspect of the present invention, there is provided a connecting structure for a pipe body according to any one of the first to third aspects, wherein the reinforcing portion comprises a bead portion which is formed at an end of the seal portion so as to project inward. Characterize.

(Operation) In the connection structure of the pipe body according to claim 1,
The connecting means arranged outside the first projecting portion and the second projecting portion prevents relative movement of the first projecting portion and the second projecting portion in the axial direction, and thus the first tubular body. And the second pipe body are connected to each other.

Then, the seal portion formed at the end portion of the second pipe body is fitted and inserted to the inner side of the first projecting portion of the first pipe body to seal against the internal fluid. In the connection structure of the pipe body according to claim 2, the pair of half-clamp members are first
Of the first projection portion and the second projection portion by arranging them on the outer sides of the projection portion and the second projection portion and connecting them with a bolt and a nut. Are sandwiched, the relative movement of the first projecting portion and the second projecting portion in the axial direction is prevented, and the first tubular body and the second tubular body are connected to each other.

According to the third aspect of the present invention, since the reinforcing portion is formed at the tip of the seal portion to reduce the deformation of the seal portion, the deformation of the seal portion is small even when the seal portion is thin. . In the pipe connecting structure according to the fourth aspect, the reinforcing portion is formed by curling the tip of the seal portion inward.

In the connection structure of the pipe body according to the fifth aspect, the reinforcing portion is formed by projecting the tip of the seal portion inward by beading.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of a connecting structure of a pipe body according to the present invention. In the figure, reference numeral 21 indicates a first pipe body, and reference numeral 23 indicates a second pipe body. . The first pipe body 21 and the second pipe body 23 are made of metal such as stainless steel, and are used, for example, as an exhaust pipe through which exhaust gas of an engine flows. The first pipe body 21 and the second pipe body 23 have the same wall thickness, and the first pipe body 21 is
The diameter is larger than that of the tubular body 23 by approximately the thickness.

A first projecting portion 21a having a semicircular cross section is formed at the end of the first tubular body 21 so as to project annularly toward the outside. On the other hand, at the end of the second pipe body 23, the first
A sealing portion 23a is integrally formed so as to be inserted into the tubular body 21 from the first protruding portion 21a to the inner side. The length of the seal portion 23a in the axial direction is determined by the size of the gap between the first tubular body 21 and the seal portion 23a, and is, for example, a length that can sufficiently seal the leakage of exhaust gas.

In this embodiment, the gap size is set to, for example, 0.3 mm in consideration of the insertability of the seal portion 23a into the first tubular body 21. Behind the seal portion 23a of the second tubular body 23, a second projecting portion 23b having a semicircular cross section is provided.
Are formed so as to project annularly toward the outside. The end of the first tubular body 21 is in contact with the second projecting portion 23b.

First protrusion 21a and second protrusion 23b
On the outer side of the first protrusion 21a and the second protrusion 23b.
A connecting means 25 is arranged to prevent relative movement of the and in the axial direction. The connecting means 25 has a pair of half-clamping members 27 arranged outside the first protruding portion 21a and the second protruding portion 23b.

The half clamp member 27 is made of metal such as stainless steel, and as shown in FIG. 2, connecting portions 27b are integrally formed on both ends of a semicircular body portion 27a.
A bolt hole 27c is formed in the connecting portion 27b.
In addition, the claw portion 2 that sandwiches the first protruding portion 21a and the second protruding portion 23b along both edges of the half clamp member 27.
7d is formed.

In the above-described tube body connection structure, the seal portion 23a of the second tube body 23 extends further than the first protruding portion 21a of the first tube body 21 to the rear side of the second tube body 23. The second protruding portion 23b is fitted and inserted until it comes into contact with the end portion of the first tubular body 21. Then, in this state, the pair of half-divided clamp members 2
7 are arranged outside the first projecting portion 21a and the second projecting portion 23b, and these are connected by bolts 29 and nuts 31 as shown in FIG. The first protrusion 21a is formed by the formed claw portion 27d.
And the second protruding portion 23b are sandwiched, and the first protruding portion 21
The relative movement of a and the second protrusion 23b in the axial direction is prevented, and the first pipe body 21 and the second pipe body 23 are connected to each other.

In the pipe connecting structure constructed as described above, the seal portion 23a formed at the end of the second pipe 23 is formed.
Is inserted from the first protruding portion 21a of the first tubular body 21 to the inner side, and, for example, since the internal fluid such as exhaust gas is sealed by the same principle as that of a tea canister, the elastic body such as rubber is used. It is possible to eliminate the need for the sealing member. Therefore, the seal member does not deteriorate due to long-term use, and the sealability can be reliably maintained.

Since no seal member is required, the number of assembling steps can be reduced. Further, in the above-described tube body connection structure, the seal portion 23a integrally formed with the second tube body 23 is fitted and inserted into the first tube body 21 to perform sealing. , It is not necessary to tighten the first tube body 21 and the second tube body 23.

Therefore, the first pipe body 21 and the second pipe body 23 can be connected easily and surely by simply connecting the pair of half clamp members 27. FIG.
The 2nd Embodiment of this invention is shown, and in this embodiment, the wall thickness of the 1st pipe body 21 and the 2nd pipe body 23 is 0.5 mm-1 mm, for example. And the seal part 2
At the tip of 3a, a reinforcing portion including a curl portion 23c formed by curling the tip of the seal portion 23a inward is formed in order to reduce deformation of the seal portion 23a.

A first projecting portion 21d formed on the first tubular body 21 is formed by curling the tip of the first tubular body 21 to the outside. In this embodiment, substantially the same effect as in the first embodiment can be obtained, but in this embodiment, the curl portion 23c for reducing the deformation of the seal portion 23a is formed at the tip of the seal portion 23a. Even when the seal portion 23a is thin, the deformation of the seal portion 23a is reduced, and the seal portion 23a is connected to the first tube 21 of the first tubular body 21.
It can be easily fitted and inserted from the protruding portion 21d to the inner side.

Further, the curl portion 23c can be easily formed by curling the tip of the seal portion 23a inward. Further, since the diameter of the tip of the curl portion 23c becomes small, the insertability into the first tubular body 21 becomes very good. FIG. 5 shows a third embodiment of the present invention.
Also in this embodiment, the wall thickness of the first tube body 21 and the second tube body 23 is, for example, 0.5 mm to 1 mm.

A bead portion 23e, which projects inward, is formed in a ring shape at the tip of the seal portion 23a by beading in order to reduce deformation of the seal portion 23a. Moreover, the 1st protrusion part 21f formed in the 1st tube body 21 is formed by flaring the front-end | tip of the 1st tube body 21 outside.

Also in this embodiment, it is possible to obtain substantially the same effects as in the second embodiment. In addition, in the embodiment described above, an example in which the claw portions 27d are formed along both edges of the main body portion 27a of the half clamp member 27 has been described, but the present invention is not limited to the embodiment. For example, as shown in FIG. 6, claw portions 27e may be formed so as to project on both edges of the main body portion 27a.

Further, in the above-described embodiment, an example in which the first tube body 21 and the second tube body 23 have different diameters has been described, but the present invention is not limited to this embodiment. Alternatively, only the seal portion 23a may have a small diameter, and the first tube body 21 and the second tube body 23 may have the same diameter. Further, in the embodiment described above, the half clamp member 27 is used.
However, the present invention is not limited to this embodiment, and may be connected by welding, for example.
You may connect by another fastening means.

The connecting means 25 is not limited to the half-clamp member 27, but may be a C-type clamp member, for example. Furthermore, in the embodiment described above, an example in which the present invention is applied to the first tubular body 21 and the second tubular body 23 made of metal has been described, but the present invention is not limited to such an embodiment. Instead, for example, it can be applied to a tubular body made of resin.

Further, in the above-described embodiment, an example in which the present invention is applied to the first pipe body 21 and the second pipe body 23 having a circular cross section is described, but the present invention is limited to such embodiment. However, the present invention can be applied to, for example, a tubular body having an elliptical cross section, a rectangular cross section, or the like.

[0031]

As described above, in the pipe connecting structure according to the first aspect, the seal portion formed at the end portion of the second pipe body is larger than the first projecting portion of the first pipe body. Inserted to the back side,
Since the seal against the internal fluid is performed, the seal member can be omitted.

Therefore, the seal member will not deteriorate due to long-term use, and the sealability can be reliably maintained. Moreover, since the seal member is not required, the number of assembling steps can be reduced. In the pipe connecting structure according to claim 2, the pair of half-clamping members are provided with the first protrusion and the second protrusion.
When the first protruding portion and the second protruding portion are clamped by the claw portions formed on both edges of the half clamp member, the first protruding portion and the second protruding portion are sandwiched between the first protruding portion and the first protruding portion. The relative movement of the projecting portion and the second projecting portion in the axial direction is prevented, and the first tubular body and the second tubular body are connected to each other, so that the first tubular body and the second tubular body are connected. Can easily and surely connect to the pipe.

In the pipe connecting structure according to the third aspect of the present invention, since the reinforcing portion is formed at the tip of the seal portion to reduce the deformation of the seal portion, the deformation of the seal portion is small even when the seal portion is thin. The seal portion can be easily fitted and inserted deeper than the first protruding portion of the first tubular body. In the pipe connecting structure according to the fourth aspect, since the reinforcing portion is formed by curling the tip of the seal portion inward, the reinforcing portion can be easily formed.

Since the reinforcing portion is curled, the first
The insertability of the into the tube is very good. In the connecting structure of the pipe body according to the fifth aspect, since the reinforcing portion is formed by projecting the tip of the seal portion inward by beading, there is an advantage that the reinforcing portion can be easily formed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a tube body connection structure of the present invention.

FIG. 2 is a perspective view showing the half clamp member of FIG.

FIG. 3 is a cross-sectional view showing a state in which the half clamp members of FIG. 1 are connected by bolts and nuts.

FIG. 4 is a cross-sectional view showing a second embodiment of the tube body connection structure of the present invention.

FIG. 5 is a cross-sectional view showing a third embodiment of the pipe connecting structure of the present invention.

FIG. 6 is a perspective view showing another example of a half clamp member.

FIG. 7 is a cross-sectional view showing a conventional connecting structure for pipes.

[Explanation of symbols]

 21 1st pipe body 21a, 21d, 21f 1st protrusion part 23 2nd pipe body 23a Seal part 23b 2nd protrusion part 23c Curl part 23e Bead part 25 Connecting means 27 Half clamp member 27d Claw part 29 Bolt 31 nuts

Claims (5)

[Claims] 1. A first tube (21) and a second tube (2)
3) In the connection structure of the pipe body for mutually connecting with, in the end portion of the first pipe body (21), a first projecting portion (21a, 21d, 21f) formed to project outwardly. )
And the first protrusions (21a, 21d, 21) formed on the end of the second pipe body (23) of the first pipe body (21).
f) A seal portion (23a) fitted and inserted further inward than the seal portion (23a) of the second pipe body (23), and the first pipe body (23) formed so as to project outward toward the outside. Two
The second protrusion (23b) with which the end of 1) abuts, and the first protrusion (21a, 21d, 21f) and the second protrusion (23b) are arranged outside the first protrusion (21a, 21d, 21f). Protrusions (21a, 21d, 21f) and second protrusions (23b)
Connecting means (25) for preventing relative movement with respect to the axial direction
And a connecting structure for a pipe body. 2. The pipe connecting structure according to claim 1, wherein the connecting means (25) includes the first protrusion (21a,
21d, 21f) and a pair of half-clamping members (27) arranged outside the second protrusion (23b) are connected by a bolt (29) and a nut (31), and the half-clamping member (27). ) By the claw portions (27d) formed on both edges of the first protrusion (21a, 21d,
21f) and the 2nd protrusion part (23b) are pinched | interposed, The connection structure of the pipe body characterized by the above-mentioned. 3. The pipe connecting structure according to claim 1, wherein the seal portion (23a) is thin, and the seal portion (23a) is deformed at the tip of the seal portion (23a). A connecting structure for a pipe body, which is characterized in that a reinforcing portion for reducing the amount is formed. 4. The tube body connection structure according to claim 1, wherein the reinforcing portion is formed by curling the tip of the seal portion (23a) inward. A connecting structure for pipes, which is made of 5. The pipe connecting structure according to any one of claims 1 to 3, wherein the reinforcing portion is a bead portion (23e) formed to project inward at a tip of a seal portion (23a). A connecting structure for pipes, which is made of