JPS627916Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is generally installed and used in many automobiles or various machines, equipment, etc. as supply channels for oil supply, air supply, etc. This invention relates to an improvement in the structure of an end fitting for connecting the end of thin-walled metal piping having a wall thickness of approximately 2 m/m or less.

As shown in FIG. 6, the conventional connection end fitting has assembly holes 12 and 12' concentrically formed in the shaft core portion thereof and communicating with the internal annular groove passage 19, and the assembly holes The circumferential end surfaces of the outer holes of the outer holes 12 and 12' are made into parallel flat seating surfaces 13 and 13', and the circumferential side wall is further provided with a connecting hole 14 with the pipe end communicating with the inside. As shown in the figure, a cylindrical wall 14' having a connecting hole with the end of the piping is provided on the circumferential wall and integrally protrudes toward the main body. Therefore, in the former case, the welding strength is poor due to the welded structure in which the connection to the end of the pipe is made only by the wall thickness of the circumferential side wall, resulting in variations in the bending shape of the pipe side, forced installation in the event of a malfunction, or vibration. There is a problem in that fatigue stress concentrates depending on the condition and causes cracking loss on the piping side of the welded part. As a result, the weight of the product increases, and the overall cutting and forming process becomes extremely complicated, increasing the number of machining operations and causing a significant reduction in productivity.

The purpose of the present invention is to provide an end fitting for connecting the end of a small diameter metal pipe, which solves the above-mentioned problems extremely simply and effectively. The end fitting is a separate reinforcing beam member that has an engagement hole smaller than the inner diameter of the attachment hole to the mating mounting base and an insertion support hole near the end of the pipe, and connects the attachment hole and the support hole to the end. The assembly hole and the brazing welding hole of the metal fitting body are positioned concentrically with each other, and the soldering hole and the support hole are spaced apart from each other and are welded to the end fitting body. Therefore, it is extremely easy to form the end fitting body and the reinforcing beam member, and the welding strength can be increased because the piping side is welded at two locations, the assembly hole and the brazing hole.

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 5. Reference numeral 1 denotes an end fitting main body, which has an assembly hole 2 penetrated through the shaft core portion for attachment to a mating base with a bolt; The peripheral end surfaces 3 and 3' of the assembly hole on both sides are parallel flat seating surfaces, and a brazing hole 4 is provided in the peripheral wall. For example, it is suitable for cutting a pipe material into round slices. It can be easily molded using a chisel. On the other hand, the reinforcing beam member 5 having a U-shaped cross section is press-molded from a metal plate, and has an engagement hole 6 smaller than the inner diameter of the assembly hole 2;
6' and a support hole 7 for insertion into the vicinity of the end of the pipe P. The end fitting is positioned concentrically with the assembly hole 2 and the solder welding hole 4, respectively, and with an arbitrary interval maintained between the mutually opposing surfaces of the solder welding hole 4 and the support hole 7. It is constructed by fixing the mounting hole 2 on the main body 1 side to the circumferential end surfaces 3, 3' of the hole by welding 8, 8'. Note that the hole diameter of the engagement holes 6, 6' on the reinforcing beam member 5 side may be made smaller than the hole diameter of the assembly hole 2 on the end fitting main body side, or the engagement holes 6, 6' may be overlapped as shown in FIG. By slightly bending the peripheral end of the hole 6' inward, and fitting the bent part into the peripheral wall of the assembly hole 2 and welding 8, 8', the inner peripheral surface of the end fitting body is A flow path 9 is formed with a gap between the mounting bolt and the mounting bolt. Note that 8'' and 8 are solder welded parts.

As described above, according to the present invention, the reinforcing beam member 5, which is separate from the side of the end fitting main body 1, is fixed to the peripheral end surfaces 3, 3' of both side holes of the assembly hole 2, so that the end fitting main body The side can be easily formed by using pipe materials, and the reinforcing beam member 5 can also be easily formed by press working with metal plate materials, so productivity is significantly improved and the product weight is reduced. As a result, the structure can be configured without causing much trouble, and the solder welding hole 4 on the one end metal fitting body 1 side
and the support hole 7 on the reinforcing beam member side with a gap maintained.
Due to the welded fixing structure in two places,
As a result, the solder welding strength to the end of the pipe P is sufficient, so even if there are variations in the bending shape of the pipe P side, forced installation in the event of a malfunction, or vibration conditions, the solder welded part on the pipe side It is possible to prevent and reduce cracks and breakages that can occur.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an end fitting for connecting the end of a small diameter metal pipe according to an embodiment of the present invention, FIG. 2 is a front view of the same, and FIG. 3 is a sectional view taken along line A-A in FIG. 1. Fourth
The figure is a front view of an end fitting for connecting the end of a small diameter metal pipe according to another embodiment, FIG. 5 is a cross-sectional view showing the state of connection in FIG. 1, and FIGS. FIG. 1... End fitting body, 2... Assembly hole, 3, 3'
... Hole peripheral end surface, 4 ... Brazed welding hole, 5 ... Reinforcement beam member, 6, 6' ... Engagement hole, 7 ... Support hole, 8,
8'... Solder welding, 9... Distribution path, P... Piping.

Claims (1)

[Scope of utility model registration request] Attachment hole 2 to the mating base with a bolt in the shaft core
, and both side peripheral end surfaces 3 of the assembly hole.
3' are mutually parallel flat seating surfaces, and a solder welding hole 4 is provided in the peripheral side wall portion to form the end fitting body 1, and an engagement hole 6, which is fitted into the assembly hole 2,
6' and a support hole 7 for insertion into the vicinity of the end of the pipe P. With the brazing hole 2 and the brazing welding hole 4 being positioned concentrically with each other, and with a distance maintained between the facing surfaces of the brazing welding hole and the support hole 7 of the reinforcing beam member 5, An end portion of a small diameter metal pipe characterized in that the walls of the engagement holes 6, 6' are fixed to the circumferential end surfaces 3, 3' of both side holes of the assembly hole 2 by welding 8, 8'. Connection end fitting.