JPH1078176A - Connecting structure between eye joint and slender metal pipe and connecting method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with heating brazing and improve the working property of connection between an eye joint and a slender metal pipe by forming a close fitting and connecting structure by annular engaging walls integrally protruded through an elastic seal member. SOLUTION: An annular recessed groove 2 is provided on the inside surface of a circumferential side wall, forming a connecting head part which is formed of a tubular material, stick material or forge product, and fastening parts 4 are provided on both side hole circumferential end surfaces of mounting holes 3 by fastening bolt provided through the recessed groove 2. An annular engaging wall 6 formed by integrally protruding the end part vicinity P' of a metal pipe P outward through an elastic seal member 5 is closely fitted to the circumferential wall part of the connecting hole 2" forming the branch pipe 2' of an eye joint 1 having the short branch pipe 2' forming the connecting hole 2" communicating with the internal recessed groove 2 which is protruded on the circumferential side wall part to constitute the connecting structure of the eye joint 1 with the slender metal pipe P. Thus, heating brazing is dispensed with, and the working property of connecting of the eye joint 1 to the slender metal pipe P is improved, and the airtightness can be also enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eye joint as a connection end fitting which is generally provided as an oil supply / air supply path to an automobile or various machines and devices, and a pipe diameter of 20 mm.
The present invention relates to a connection structure with a metal pipe end having a relatively small diameter of about m / m or less and a connection method thereof.

[0002]

2. Description of the Related Art Conventionally, as a connecting structure of this kind and a connecting method thereof, for example, as shown in FIG. 9, an annular groove (22) inside a head formed by an eye joint (21) formed by cutting or the like. ) To the branch hole (21 ').
3) and simply the connection end (P ₁ ′) of the metal pipe (P ₁ )
Then, in this state, the engaging portions formed by each other are heated and welded (W) by hand broiling using a burner or the like to form a connection. Reference numeral (24) denotes a seat at the peripheral end surfaces of both side holes of the mounting hole (25).

[0003]

However, in such a conventional technique, not only the workability is remarkably reduced due to the low welding (W) due to the heating operation,
Due to local overheating due to inexperience of the operator at the time of the welding of the row, mechanical deterioration occurs near the row welding (W) and often becomes brittle on the pipe (P ') side under vibration in the arrangement state. Cracks and breakage caused by cracks, and furthermore, an eye joint (21) and a metal pipe (P) which have been subjected to corrosion-resistant plating or resin coating in advance in connection with low welding (W).
_Since the use of ₁ ) is made impossible and the treatment must be performed after the low welding operation, if the metal pipe (P ₁ ) is already formed into a complicated bent shape, the treatment is performed. This has a problem that the coating property is significantly impaired and the plating film thickness or the coating film thickness becomes non-uniform.

[0004] The present invention has been made in view of the above-mentioned problems of the prior art, and eliminates the need for heating low welding as in the prior art, thereby improving the workability, and at the same time, improving airtightness by reliable connection. Eliminate the fear of leakage by raising the height, and prevent mechanical deterioration such as embrittlement, and under the vibrating arrangement condition, there is no mechanical deterioration such as embrittlement at the connection part. Further, the use of an eye joint and a metal pipe which have been subjected to a corrosion-resistant plating coating treatment or a resin coating treatment in advance is possible, and these treatments after connection are not required at all, so that the workability of the eye joint can be significantly improved. It is an object of the present invention to provide a connection structure for connecting a metal pipe with a small-diameter metal tube and a connection method thereof.

[0005]

In order to achieve the above-mentioned object, a first embodiment of the present invention has an annular concave groove on an inner peripheral surface of a peripheral side wall, and a mounting hole penetrating through the concave groove portion. Of the connecting hole formed by the branch pipe of the eye joint formed by projecting a short branch pipe forming a connecting hole communicating with the internal concave groove in the peripheral side wall while forming the peripheral end surfaces of both side holes as seats. An eye joint and a small-diameter metal pipe, which are formed by integrally engaging an annular engagement wall which bulges outwardly around the end of the metal pipe integrally with the peripheral wall with an elastic seal member interposed therebetween. And the connection structure with the gist.

In a second embodiment of the present invention, an annular groove is formed on an inner peripheral surface of a peripheral side wall by using a material in advance, a mounting hole penetrating through the concave groove portion, and seats on both sides of the hole peripheral end surface. Part, and the connection hole of the short branch pipe protruding from the peripheral side wall, respectively, are set to the specified dimensions, and the eye joint is set in one of the split mold chucks. Then, the metal pipe side is set to the other chuck by projecting the vicinity of the end, and an elastic seal member is inserted or painted into at least one of the connection hole and the end of the metal pipe, and at least one of the chucks is advanced. , So that it is integrally bulged outwardly as the shaft is pressed in the axial direction accompanying the insertion into the connection hole near the end, and the two are closely engaged with each other by the formed annular engaging wall. Eye joints and small metal tubes Connecting method in which the gist of the.

In a third embodiment of the present invention, an annular groove is formed on an inner peripheral surface of a peripheral side wall in advance with a material, a mounting hole penetrating through the concave groove, and seats on both sides of the peripheral end surface of the hole. The eye joint, which is formed by dividing a portion and a connection hole in a short branch pipe formed in advance with an annular engaging wall projecting outward from the peripheral side wall and bulging outward, is divided. The metal tube side is set to the other chuck by projecting near the end portion facing the chuck and setting the metal tube side to the other chuck, and an elastic seal is provided on at least one of the connection hole and the end portion of the metal tube. Inserting or coating a member, advancing and moving at least one of the chucks, thus bulging outward integrally with the axial pressing accompanying insertion into the connection hole near the end, Engage each other closely with the molded annular engaging wall Eye joint and method of connecting the small diameter metal tube made is to the subject matter of.

[0010] With the above-described structure, the present invention provides a heating rouge which is not required by the close-fitting and connecting structure of the annular engaging walls bulging integrally with each other with the elastic seal member interposed therebetween. The workability is improved by welding, and the airtightness is improved to prevent leakage. At the same time, the mechanical connection between the end of the metal pipe and the joint between the branch pipes of the eye joint does not cause vibration. Under the installed condition, cracks and breakage due to fatigue at the connection part can be reduced and prevented, and furthermore, an eye joint and a metal pipe which have been subjected to a corrosion-resistant plating treatment or a resin coating treatment in advance can be used for the treatment. Properties can be significantly improved.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a connecting structure of an eye joint and a small-diameter metal tube formed by a connecting method according to the present invention; 2 is a view corresponding to FIG. 1 of another embodiment, FIG. 3 is a view corresponding to FIG. 1 of still another embodiment, and FIG. 4 is a view of FIG. 1 of still another embodiment.
FIG. 5 is a cross-sectional view of a setting state of the eye joint and the small-diameter metal tube of FIG. 1 with a chuck according to the connection method of the present invention, and FIG. 6 is an explanatory view of a pressing state at the time of connection of FIG. 7 is a cross-sectional view of a setting state of the eye joint and the small-diameter metal tube of FIG. 2 in a chuck according to the connection method of the present invention, and FIG. 8 is an explanatory view of a pressed state at the time of connection in FIG. ) Denotes an eye joint, which is formed by cutting a pipe, a bar, a forged product, or the like as a material in advance on an inner peripheral surface of a peripheral side wall formed by a connecting head, and penetrates the concave groove. Mounting holes (3) for fastening bolts, and seats (4) at the peripheral end faces of the holes on both sides thereof, and connecting holes (2 ") at short branch pipes (2 ') projecting from the peripheral side wall. The eye joint (1) is formed on the side of the branch pipe (2 '), Annular engagement bulges outwardly as shown in 7 wall (6) may be formed me previously a.

An elastic seal member (5) made of a rubber material, a resin material, a celite material, or the like is provided in the connection hole (2 ").
The branch pipe (2 ') is projected outwardly as shown in FIG. 5 or positioned inside as shown in FIG. Then, the same elastic seal member (5) as described above is attached or coated near the end protruding to the outside in a position facing the chuck, and the other chuck on the metal pipe (P) side is set. 8), at least one of the chucks (7, 8) is moved forward, and thus, as the metal tube is pressed in the axial direction accompanying the insertion (P ') into the connection hole (2 ") near the end (P'). The elastic sealing member (5) is interposed and tightly engaged with each other via an annular outwardly bulging annular engaging wall (6) to form a connection structure.

In the above embodiment, an elastic seal member (5) made of a rubber material, a resin material or a celite material is provided on both the connecting hole (2 ") and the end portion (P ') of the metal tube (P). Although the case of insertion or coating has been described, it is sufficient to provide one of them as long as the sealing property is ensured.
In the case where an outwardly swelling annular engaging wall (6) is previously formed in the branch pipe (2 ') in advance as described above, the engagement formed as the axial pressing is performed. The swelling is performed only at the portion of the metal tube (P) opposed to the joint wall, and the metal tube (P) is tightly engaged.

Further, if desired, the engaging wall (6) can be provided at a plurality of places as shown in FIG. 3, and in addition to the engaging wall, a part is caulked (9) as shown in FIG. It can also be connected and configured.

[0013]

As described above, the connecting structure of the eye joint and the small-diameter metal pipe and the connecting method according to the present invention provide the connecting hole (2 ") of the branch pipe (2 ') formed by the eye joint (1). ) With the elastic seal member (5) interposed therebetween and the vicinity of the end of the metal pipe (P) inserted and closely engaged with each other by a bulged annular engagement wall (6) formed integrally. As a result, there is no need for heating brazing at the connecting portion, so that there is no mechanical deterioration at the connecting portion and the workability can be improved. Intervention enhances the airtightness to eliminate the fear of leakage, and the vibration absorption effect allows the joint to be cracked and damaged due to fatigue under the vibrating arrangement condition. Eye with coating or resin coating Yointo (1) and metal pipe (P)
And an extremely useful connection structure between an eye joint and a small-diameter metal tube, and a method for connecting the same.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a connection structure between an eye joint and a small-diameter metal tube configured by the connection method of the present invention.

FIG. 2 is a view corresponding to FIG. 1 of another embodiment.

FIG. 3 is a diagram corresponding to FIG. 1 of still another embodiment.

FIG. 4 is a view corresponding to FIG. 1 of still another embodiment.

FIG. 5 is a cross-sectional view showing a state in which the eye joint and the small-diameter metal tube of FIG. 1 are set with a chuck according to the connection method of the present invention.

FIG. 6 is an explanatory view of a pressed state at the time of connection in FIG. 5;

FIG. 7 is a cross-sectional view showing a setting state of the eye joint and the small-diameter metal tube of FIG. 2 with a chuck according to the connecting method of the present invention.

FIG. 8 is an explanatory diagram of a pressed state at the time of connection in FIG. 7;

FIG. 9 is a cross-sectional view of a connection structure between an eye joint and a small-diameter metal tube configured by a connection method of a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 eye joint 2 concave groove 2 ′ branch pipe 2 ″ connecting hole 3 mounting hole 4 seat 5 elastic seal member 6 engaging wall 7 one chuck 8 the other chuck

Claims (3)

[Claims] An inner peripheral surface of a peripheral side wall has an annular groove (2), and both side peripheral end surfaces of a mounting hole (3) penetrating the concave groove are formed as seats (4). An eye joint (1) formed by protruding a short branch pipe (2 ') forming a connection hole (2 ") communicating with an internal concave groove (2) in the peripheral side wall portion. On the peripheral wall of the hole (2 "), an annular engaging wall (6) is formed by integrally protruding outward around an end (P ') of the metal tube (P) through an elastic sealing member (5). A connection structure for connecting an eye joint and a small-diameter metal tube, wherein the eye joint and the small-diameter metal tube are formed so as to be closely engaged with each other. 2. An annular concave groove, a mounting hole penetrating through the concave groove portion, seats on the peripheral end surface of the hole on both sides thereof, and a projecting hole formed on the peripheral side wall in advance with the material. The eye joints, each of which has a connection hole in a short branch pipe and is shaped to a prescribed size, are set on one of the chucks formed of a split mold. Set the side to the other chuck, insert or apply an elastic sealing member to at least one of the connection hole and the end of the metal tube, advance and move at least one of the chucks, and thus close to the end. An eye joint, wherein the eye joint is swelled outward integrally with the axial direction accompanying the insertion into the connection hole and integrally engaged with each other by a molded annular engaging wall. How to connect with small diameter metal tube. 3. An annular concave groove, a mounting hole penetrating through the concave groove portion, seats at the peripheral end surfaces of the hole on both sides thereof, and a protruding portion formed on the peripheral side wall. The connecting hole in the short branch pipe formed in advance with the annular engaging wall bulging outward, and the eye joint formed respectively are set on one of the split mold chucks, Further, the metal tube side is set to the other chuck by protruding near the end portion facing the chuck, and an elastic seal member is inserted or coated on at least one of the connection hole and the end portion of the metal tube, At least one of the chucks is advanced and moved, and thus is integrally swelled outward as the shaft is pressed in the axial direction accompanying the insertion into the connection hole near the end, and is mutually sealed by the formed annular engagement wall. An eye join characterized by being engaged together Connection method between the metal pipe and the small diameter metal pipe.