JPH09303633A - Tubular body connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and reliably prevent the relative rotation of a first tubular body and a second tubular body to each other while ensuing the seal function in a tubular body connection structure for connecting the first and second tubular bodies to each other. SOLUTION: First annular recessed parts 21a and 23a and second annular recessed parts 21b and 23b are formed in the ends of a first tubular body 21 and a second tubular body 23 respectively. A tubular collar member 25 is fixedly inserted into the first and second tubular bodies 21 and 23 with its one end and the other being on the ends of the first and second tubular bodies respectively. An annular connecting member 27 is fitted outside the first and second tubular bodies 21 and 23. The connecting member 27 is formed with third annular recessed parts 27a and 27b and fourth annular recessed parts 27c and 27d which are brought into close contact with the corresponding first and second annular recessed parts on the first and second tubular bodies 21 and 23. The first or second annular recessed parts are formed to have their width or depth varying depending on their position on the periphery.

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 In recent years, in automobiles, exhaust pipes have been made thinner due to demands for weight reduction and cost reduction.
Regarding the connection part of the exhaust pipe, a connection structure that does not use welding is demanded due to the difficulty of arc welding due to the thinning of the exhaust pipe. Conventionally, as a connection structure for a pipe body that does not use welding, for example, a structure disclosed in Japanese Patent Application Laid-Open No. H06-11077 is known.

FIG. 2 shows the connecting structure of the pipes disclosed in this publication. In this connecting structure of pipes, the end of the first pipe 11 and the end of the second pipe 13 are shown. The coupling member 15 is fitted on the outer side of the first tubular body 11 and the second tubular body 13 are plastically deformed by the annular projection 15a formed so as to project inward from the coupling member 15, and the first tubular body 11 and the second tubular body 13 are plastically deformed. An annular protrusion 11a protruding inward from the tube body 11 and the second tube body 13,
13a are formed.

In such a pipe connecting structure, since the annular projection 15a of the connecting member 15 is in close contact with the annular projections 11a and 13a of the first and second pipes 11 and 13, welding is performed. Good sealability can be obtained without using.

[0005]

However, in such a conventional connecting structure for pipes, the annular projection 15a of the connecting member 15 is the annular projection of the first pipe 11 and the second pipe 13. Since the first pipe 11 and the second pipe 13 are only in close contact with each other, when a relative rotational force acts on the first pipe 11 and the second pipe 13, the first pipe 11 and the second pipe 13 There was a problem that and rotate relative to each other.

The present invention has been made in order to solve such a conventional problem, and easily and surely prevents relative rotation between the first tube body and the second tube body while ensuring the sealing property. It is an object of the present invention to provide a connecting structure for a pipe body that can be manufactured.

[0007]

According to a first aspect of the present invention, there is provided a connection structure for connecting a first pipe body and a second pipe body, which are made of metal, to each other. A first annular projecting portion and a second annular projecting portion projecting inward at the end of the second tubular body and the end of the second tubular body at intervals from the end face side, and the first tubular body is formed. At the end of and the end of the second tube,
The one side and the other side of the tubular collar member are fitted and inserted until they come into contact with the first annular protrusion, and the first annular protrusion and the outside of the first tubular body and the second tubular body. An annular connecting member made of metal is fitted to cover the second annular protrusion, and the first annular protrusion and the second annular protrusion of the first pipe body and the second pipe body are fitted to the connecting member. Forming a third annular protrusion and a fourth annular protrusion that closely adhere to each other,
The width or depth of the annular protrusion or the first annular protrusion is different on the circumference.

(Operation) In the connecting structure of the pipe body according to claim 1,
The third annular protrusion and the fourth annular protrusion of the connecting member fitted to the outside of the first pipe and the second pipe are the first annular protrusion of the first pipe and the second pipe. And the second annular protrusion are in close contact with each other, and the sealing property is ensured. Moreover, since the width or depth of the second annular projection or the first annular projection is made different on the circumference, relative rotation of the first tubular body and the second tubular body is prevented.

Further, in the connecting member, the formation of the third annular protruding portion along the first annular protruding portion of the first tubular body and the second tubular body is performed by, for example, press molding, roll molding or the like. Is performed by plastically deforming the collar member. At this time, the collar member functions as a core metal.

[0010]

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

FIG. 1 shows an embodiment of a connecting structure of a pipe body according to the present invention. In the drawing, reference numeral 21 denotes a cylindrical first member.
And the reference numeral 23 indicates a cylindrical second tubular 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. At the end portion of the first pipe body 21 and the end portion of the second pipe body 23, first annular protrusions 21a, 23a and second annular protrusions 21b, 23b protruding inward, respectively, are sequentially arranged from the end face side. Pre-formed at intervals.

The widths W of the second annular protrusions 21b and 23b are formed differently on the circumference. In this embodiment, the width W of the second annular protrusions 21b and 23b is the maximum width portion W1 or the minimum width portion W2 above and below, and is continuously reduced or increased in the vertical direction.

That is, the second annular protrusions 21b and 23b
Has a shape in which both ends of the maximum width portion W1 on one side and both ends of the minimum width portion W2 on the other side are connected by a straight line. Maximum width W1
Has a width of, for example, 10 mm, and the minimum width portion W2 has a width of, for example, 5 mm. Then, at the end of the first pipe body 21 and the end of the second pipe body 23, one side and the other side of the collar member 25 made of a metal such as stainless steel are connected to the first annular protrusions 21a and 23a. It is inserted until it abuts.

Outside the first tube body 21 and the second tube body 23, a metal such as stainless steel is formed at a position where the first annular projections 21a, 23a and the second annular projections 21b, 23b are covered. An annular connecting member 27 is fitted. The connecting member 27 is longer than the length between the second annular protrusions 21b and 23b.

The connecting member 27 has a first tube body 2
First annular projections 21a, 23a of the first and second tubular bodies 23
A third annular protrusion 27a, 27b and a fourth annular protrusion 27c, 27d are formed along the second annular protrusion 21b, 23b. The third annular protrusions 27a, 27b and the fourth annular protrusions 27c, 27d are formed by, for example, press forming, the first annular protrusions 21a, 23a and the first annular protrusions 21a, 23a of the first tubular body 21 and the second tubular body 23. 2 annular protrusions 21b, 23
It is formed by plastically deforming the connecting member 27 along b.

In this case, a split press die having an inner shape substantially the same as the outer shape of the first pipe body 21 and the second pipe body 23 joined together through the collar member 25 is used. The entire joining portion may be pressed to tightly join the connecting member 27 to the entire joining portion including the third annular protrusions 27a and 27b and the fourth annular protrusions 27c and 27d.

At this time, the collar member 25 functions as a core metal. In the tube connecting structure configured as described above, the third annular protrusions 27a and 27b and the fourth annular portion of the connecting member 27 fitted to the outside of the first tube 21 and the second tube 23 are provided. Since the protrusions 27c and 27d are in close contact with the first annular protrusions 21a and 23a and the second annular protrusions 21b and 23b of the first tube body 21 and the second tube body 23, high sealing performance can be obtained. it can.

Further, since the widths of the second annular protrusions 21b and 23b and the fourth annular protrusions 27c and 27d are made different on the circumference, the first pipe body 21 and the second pipe body 23 are relatively rotated. It can be prevented easily and surely. Then, in this embodiment, the width W of the second annular protrusions 21b and 23b is maximized or minimized above and below and is continuously reduced in the vertical direction.
It is possible to more reliably prevent relative rotation between the first tube body 21 and the second tube body 23.

In addition, in the above-described tube body connection structure, the collar member 25 functions as a core metal, so that the third annular projection 27 is formed.
The a and 27b can be reliably formed. In the embodiment described above, the first tubular body 21 and the second tubular body 23
However, the present invention is not limited to this embodiment, and the first tube body and the second tube body may have different diameters.

Further, in the above-described embodiment, the second annular protrusions 21b and 23b and the fourth annular protrusions 27c and 27d.
However, the present invention is not limited to such an embodiment, and the depths of the second annular protrusion and the fourth annular protrusion or the second annular protrusion are different. Also, both the width and the depth of the fourth annular protrusion may be different at the same time.

Further, in the embodiment described above, the second annular protrusions 21b and 23b and the fourth annular protrusions 27c and 27 are used.
Although an example in which the width W of d is different has been described, the present invention
The present invention is not limited to this embodiment, and the first annular protrusion and the third annular protrusion may have different widths.

[0022]

As described above, in the pipe connecting structure according to the first aspect, the third annular protrusion and the third annular protrusion of the connecting member fitted to the outside of the first pipe and the second pipe are provided. 4 annular protrusions
A first annular projection of the first tubular body and the second tubular body and a second
Since it is in close contact with the annular protrusion, high sealing performance can be obtained.

Further, since the width or depth of the first annular projection or the second annular projection is made different on the circumference, it is easy to relatively rotate the first tubular body and the second tubular body, It can be reliably blocked. Further, since the collar member functions as the core metal, the third annular protrusion can be reliably formed.

[Brief description of drawings]

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

FIG. 2 is a partial vertical cross-sectional view showing a conventional connection structure for pipes.

[Explanation of symbols]

 21 1st tubular body 21a, 23a 1st annular protrusion 21b, 23b 2nd annular protrusion 23 2nd tubular body 25 Collar member 27 Connecting member 27a, 27b 3rd annular protrusion 27c, 27d 4th annular protrusion

Claims (1)

[Claims] 1. A pipe connecting structure for mutually connecting a first pipe body (21) and a second pipe body (23) made of metal, wherein an end portion of the first pipe body (21) is provided. And the second tube (2
At the end of 3), the first annular protrusion (21a, 21a,
23a) and the second annular protrusions (21b, 23b) are sequentially formed at intervals from the end face side, and the first tubular body (2
The end of (1) and the end of the second tubular body (23) are fitted until one side and the other side of the tubular collar member (25) come into contact with the first annular projection (21a, 23a). While being inserted, the first tube body (21) and the second tube body (23)
A ring-shaped connecting member (27) made of metal is fitted to the outside of the first annular projection (21a, 23a) and the second annular projection (21b, 23b), and the connecting member (2
7), the first tubular body (21) and the second tubular body (2)
3) The first annular protrusions (21a, 23a) and the second
A third annular protrusion (27a, 27b) and a fourth annular protrusion (27c, which are in close contact with each other along the annular protrusion (21b, 23b).
27d) and forms the second annular protrusions (21b, 23).
b) or the connection structure of the pipe body, characterized in that the width or depth of the first annular protrusions (21a, 23a) is made different on the circumference.