JPS6123995Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is generally installed and used in many vehicles or various machines, devices, etc. as supply channels for oil supply, air supply, etc. This invention relates to an improvement in the structure of a pipe end connecting eye joint that is soldered to the end of a pipe.

A conventional eye joint for connecting pipe ends is a thick-walled metal pipe piece 11, as shown in FIGS. 4 and 5.
An annular groove 13 is formed by cutting on the inner circumferential side of the frame, and curved wall portions 14, 14' are formed with parallel seating surfaces 12, 12' on both end circumferential surfaces, or
Alternatively, a generally thin metal tube piece 11 having an annular groove 13 formed therein by bulging outward by axial pressing is formed into parallel seating surfaces 12, 12' with bent walls 14, 14'. It was constructed by cutting it in such a way.

Therefore, in the case of the former, the concave groove 13 is formed by cutting.
In connection with the problem of thinning of the circumferential wall surface due to the formation of A sufficient welding area cannot be secured in the welding hole 15 between the branch pipe or piping, which is provided through the welding hole 15, and often the solder welding in the welding hole is incomplete and leakage occurs. It became.

The purpose of the present invention is to provide an eye joint for connecting pipe ends made of metal pipe material, which solves these problems extremely effectively.Examples of the present invention will be described below in detail with reference to Figs. 1 to 3. Then, the wall thickness of the cut end surfaces on both sides as parallel seating surfaces 2 and 2'
A short metal tube piece 1 of 2 m/m to 5 m/m has an annular recess formed on the inner circumferential surface along the circumferential surface by pressing in the axial direction on a part of the circumferential wall near the center. Groove 3
A protruding wall 4 to the outside is formed along the 5
is a welding hole for connecting a branch pipe or pipe to the side wall extending over the projecting wall 4 and having a hole diameter larger than the width W of the projecting wall. Note that 6 is a tightening bolt and 7 is a connection base.

As described above, according to the present invention, the annular groove 3 is
It is constructed with a protruding wall 4 extending to the outside, and furthermore, a solder welding hole 5 having a hole diameter larger than the width W of the protruding wall is penetrated in the side wall surface over the protruding wall portion, so that the solder welding hole 5 has a diameter larger than the width W of the protruding wall. The solder welding area on the circumferential surface of the welding hole 5 can be sufficiently enlarged compared to the wall thickness of the metal tube piece 1 itself, so that the solder welding area in the welding hole 5 can be sufficiently expanded. On the other hand, this expansion also makes it possible to generally use thin-walled metal pipe materials, and furthermore, when attaching to the connection base 7, due to defects such as bending shape, the parallel bearing surfaces 2, 2' Even if there is uneven contact, the concave groove 3 exerts a partial undulation adjustment function as the tightening bolt 6 is screwed and tightened, so that it can be brought into contact with the parallel seating surfaces 2, 2' without difficulty.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an eye joint for pipe end connection made of a metal pipe material according to an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig.
FIG. 4 and FIG. 5 are vertical sectional views showing conventional examples. 1...Metal tube piece, 2, 2'...Parallel seating surface, 3...
...Annular groove, 4...Protruding wall, 5...Welding hole,
W: Width of the protruding wall.

Claims (1)

[Scope of utility model registration request] An annular recess is formed on the inner circumferential surface along the circumferential surface in a part near the center of the circumferential wall of the short metal tube piece 1 whose cut end circumferential surfaces on both sides are parallel seating surfaces 2 and 2'. A protruding wall 4 to the outside is formed along with the groove 3, and a welding hole 5 is penetrated into the interior to extend over the protruding wall 4 and connect to a branch pipe or piping having a hole diameter larger than the width W of the protruding wall. An eye joint for connecting pipe ends made of metal pipe material.