JPS6240230Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is generally used for comparison of pipes with a diameter of about 30 m/m or less, which are often installed as various oil supply or air supply channels for automobiles, machines, equipment, etc. This invention relates to an improvement in the structure of an eye joint for connecting the end of a metal tube having a relatively small diameter.

[Conventional technology]

Conventionally, this type of connecting eye joint has, for example, an annular flange portion integrally connected to the main body, with a central hole as a bolt mounting hole, at both open ends of a substantially cylindrical main body, as shown in FIG. The seat surfaces 13 and 14 were configured as flat surfaces 15 parallel to each other.

[Problem that the invention attempts to solve]

However, in the case of such a conventional connecting eye joint, due to the structure having seating surfaces 13 and 14 made of mutually parallel flat surfaces 15, the connection between the brazing hole in the outer peripheral side wall of the eye joint and the piping is prevented. Due to misalignment, defects, or variations in the bent shape of the piping side of the product, uneven contact may occur on the mounting surface to the mating mounting base, and if the bolt is forcibly tightened in this state, the area near the welded part may be damaged. This causes an abnormal concentration of stress on the piping side, and combined with the overheating during the soldering process and the installation condition under vibration, cracks and breakage due to fatigue often occur on the nearby piping side. This has the problem of causing accidents, and tends to require a relatively large amount of tightening force during installation.

In order to extremely effectively solve the above-mentioned conventional problems, the present invention has a structure in which at least one of the seating surfaces is formed as a gentle slope from the peripheral edge of the mounting hole toward the outer peripheral edge. As the screws are tightened, the gentle slope gradually collapses inward to form a flat seating surface structure due to resilient engagement, and this collapse may cause misalignment, defects, or variations in the bent shape of the piping side. Even when there is uneven contact with the mating base, the contact on the seat surface can be self-adjusted effortlessly and evenly, improving sealing performance.
Furthermore, this self-adjusting function absorbs and alleviates stress concentration applied to the piping side near the welded part, reducing and preventing cracks and breakage due to fatigue occurring on the piping side in the vicinity. The purpose is to propose an eye joint.

[Means for Solving the Problem] The present invention provides a seating surface by integrally connecting annular flanges with a central hole as a bolt mounting hole at both open ends of a substantially cylindrical main body; and a metal eye joint structure in which an outer circumferential surface of the main body is provided with a welding hole for connecting to a pipe end so as to communicate with the hollow interior of the main body, and at least one of the seat surfaces is
The gist of the present invention is an eye joint for connecting the end of a small diameter metal tube, which is formed as a gentle slope from the circumferential edge side of the mounting hole toward the outer circumferential edge.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings. Fig. 1 is a plan view of the eye joint for connecting the end of a small diameter metal pipe of the present invention, and Fig.
3 is a diagram corresponding to FIG. 2 of another embodiment, and FIG. 4 is a partially cutaway sectional view showing the installation and usage state of FIG. The main body has a cylindrical shape, and at the open end of the main body, an annular flange portion 5 with a central hole as a mounting hole 2 for a bolt 9 is connected integrally with the main body, and the annular flange portion 5 is connected to a seat surface 3. , 4, and at least one of the seating surfaces 3, 4 is formed as a gentle slope from the peripheral edge side of the mounting hole 2 toward the outer peripheral edge. 6
is a welding hole 8 for welding the end of a pipe 7 provided on the outer circumferential surface of the main body 1 so as to communicate with the hollow interior of the main body. 10 is a mating mounting base.
In FIG. 4, reference numeral 5' denotes a seat structure in which the gentle slope gradually collapses inward as the screws are tightened during installation, and becomes flat due to resilient engagement.

[Function] Since the present invention is configured as described above, at least one of the seating surfaces 3 and 4 is configured as a gentle slope from the hole peripheral edge side of the mounting hole 2 toward the outer peripheral edge. During installation, as the mounting bolt 9 is screwed into the mating mounting base 10, the gentle slope gradually collapses inward, resulting in a flat seat structure 5' due to resilient engagement.

[Effect of idea]

As explained above, the connection eye joint of the present invention is capable of self-adjusting the contact at the seating surface naturally and uniformly even in the event of one-sided contact with the mating mounting base 10 due to misalignment, malfunction, or variation in the bending shape of the pipe 7 side, as the gentle slope of at least one of the seating surfaces 3, 4 collapses when screwed and fastened. This not only improves the sealing performance, but also absorbs and alleviates the stress concentration applied to the pipe 7 in the vicinity of the brazing joint 8, thereby preventing fatigue-related cracks and other problems that may occur on the pipe 7 side in that vicinity due to the self-adjusting function.
This is an extremely useful eye joint for connecting the ends of small diameter metal pipes, which can reduce or prevent breakage.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an eye joint for connecting the end of a small diameter metal tube showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line shown in Fig. FIG. 2 is a view corresponding to FIG. 2, FIG. 4 is a partially cutaway sectional view showing the installed state of use, and FIG. 5 is a longitudinal sectional view of a conventional product. 2... Mounting hole, 3, 4... Seat surface, 5... Annular flange portion.

Claims (1)

[Scope of utility model registration request] At both open ends of a substantially cylindrical main body 1, an annular flange portion 5 with a center hole as a bolt mounting hole 2 is integrally connected to the main body 1 to form seating surfaces 3 and 4, and the outer periphery of the main body 1 In a metal eye joint structure in which a solder welding hole 6 is provided to the end of the pipe so as to communicate with the hollow interior of the main body, at least one of the seating surfaces 3 and 4 is connected to the peripheral end of the mounting hole 2. An eye joint for connecting the end of a small diameter metal pipe, characterized in that it is configured with a gentle slope from the edge toward the outer periphery.