JPS6320477Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is generally installed and used in many vehicles and various machines and devices as supply channels for oil, air, etc., and is a relatively small diameter pipe with a diameter of about 30m/m or less. The present invention also relates to an improvement in the connection brazing structure of a fitting for connecting the end of a thin-walled metal pipe having a wall thickness of about 2 m/m or less.

As shown in FIG. 3, in the conventional connection welding structure, assembly holes 12 and 12', which communicate with the internal annular groove passage 13, are concentrically provided through the shaft core, and the assembly holes It is composed of a joint body 11 with parallel flat seating surfaces 14, 14' at the peripheral edges of the outer holes of the body 12, 12', and a through hole 15 provided in the circumferential side wall of the body 11, which is stepped at one end. The short pipe piece member 16 with a reduced diameter is fitted with the reduced diameter part and soldered with a solder 19, and the end of the pipe P' is soldered with a solder 19 on the other end side of the pipe piece member 16.
8 and configured it.

However, drawing and forming the short pipe piece member 16 alone is not only troublesome, but also involves drawing the end of the pipe P' into the through hole 1 on the side of the joint body 11.
Due to the structure that cannot be directly soldered to the circumferential surface of the hole in No. 5, the piping P', which has various bent shapes, may be forcibly assembled or placed under vibration conditions due to variations or defects at the bent portion. With use, etc., cracks due to concentration of fatigue stress and leakage due to breakage often occur at the root of the stepped reduced diameter part of the welded weld 19, making the use of the short pipe piece member 16 pointless. However, the results were not as expected.

The purpose of the present invention is to provide a welding structure for connecting fittings for connecting the ends of small-diameter metal pipes, which solves the above-mentioned problems extremely effectively with a simple structure. To explain in detail with reference to the figures and FIG. 2, the joint body 1 has assembly holes 2 and 2' concentrically extending through the shaft core thereof and communicating with the internal annular groove passage 3. The outer peripheral edge of the hole is configured as parallel flat seating surfaces 4, 4', and the main body 1
A through hole 5 to the inside is provided in a part of the peripheral side wall of the through hole 5, and a curved reinforcing plate piece member 6 having an engagement hole 7 having approximately the same diameter as the through hole is provided near the outer circumference of the through hole 5. They are concentrically abutted and soldered 8, and at the same time, the end of the pipe P is soldered 9, across the through hole 5 on the main body 1 side and the engagement hole 7 on the reinforcing plate piece member 6 side. 10 and connect and configure.

As described above, according to the present invention, since the curved reinforcing plate piece member 6 is simply configured as a plate-like body, it can be easily formed by press working, and on the other hand, the end portion of the pipe P can be Due to the structure in which the solder weld 9 is directly applied to the circumferential surface of the through hole 5 on the main body 1 side, the solder weld 1 to the engagement hole 7 of the reinforcing plate piece member 6 is formed.
By multiplying by 0, a sufficient welding area can be obtained,
At the same time, it is possible to effectively disperse and absorb fatigue stress applied to the piping P side near these solder welds 9 and 10, and to reduce and prevent cracks and breakage.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a connection state of a small-diameter metal pipe end connection fitting having a connection soldering structure according to an embodiment of the present invention, and Fig. 2 is a cross section taken along the line A-A in Fig. 1. 3 are vertical sectional views showing a conventional example. 1... Joint body, 5... Through hole, 6... Curved reinforcing plate piece member, 7... Engagement hole, 8, 9, 10... Solder welding, P... Piping.

Claims (1)

[Scope of utility model registration request] The main body includes a joint body in which an assembly hole communicating with an internal annular groove passageway is concentrically formed in the shaft core part, and the outer hole periphery of the assembly hole is configured as a parallel flat seating surface. In the connection brazing structure in which the end of the pipe is soldered and connected to the through hole provided in the peripheral side wall of the inside, there is a hole in the vicinity of the outer circumference of the through hole 5 that is approximately the same as the through hole. The curved reinforcing plate piece member 6 having the engagement hole 7 of the same diameter is concentrically abutted and soldered 8, and the end of the pipe P is connected to the through hole 5 on the main body 1 side and the reinforcing plate piece member 6 side. Batch soldering 9, 1 over the matching hole 7
1. A connecting welding structure for a fitting for connecting an end of a small diameter metal pipe, characterized in that the connecting structure is made by connecting the end of a small diameter metal pipe.