JPH0110542Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is generally installed and used in many automobiles and various machines and devices as supply lines for oil and air. The present invention relates to an improvement in a structure for welding and fixing an end of a thin-walled metal pipe having a relatively small diameter of less than 2 m/m and a connecting end fitting with a wall thickness of approximately 2 m/m or less.

(Prior art) As shown in FIG. 3, the conventional welding fixation structure has one end stepped on the circumferential surface of the through hole 15 provided in the circumferential wall of the end fitting body. The reduced diameter part of the branch pipe 16, which is a separate part with a reduced diameter part, is fitted, soldered and welded 17, and the other end protrudes outward, and the pipe P is formed on the protruding peripheral surface of the other end. The connecting end of ¹ is inserted and engaged up to the root of the stepped diameter-reduced part and is then welded 18.

(Problems to be solved by the invention) However, there is a tendency of heating near the stepped part due to manual heating during welding, and the insertion is only possible up to the root of the stepped reduced diameter part at the end of pipe ^P1 . Single wall structure near the stepped part that is not engaged, variations in various bending shapes as a product of piping P ¹ , and unreasonable connection and assembly to the mating base surface when the seating surface hits unevenly due to defects, In addition, due to installation and use under vibration conditions, cracks and breakage often occur near the step of the reduced diameter part on the branch pipe 16 side of the solder weld 17 due to concentration of fatigue stress. Problems such as closing occurred.

An object of the present invention is to provide a welding structure for fixing the end of a small-diameter metal pipe and a connecting end fitting, which extremely effectively solves the above-mentioned problems.

(Means for Solving the Problem) The present invention has concentric mounting holes that communicate with the internal annular groove in the shaft core, and parallel flat peripheral edges of the mounting holes. One end of a separate short branch pipe is soldered to the seat surface, and the other end of the pipe is protruded outward to the circumferential surface of the through-hole to the inside, which is provided in the peripheral wall. In the fixing structure, the end fitting body is constructed by polymerizing and welding the connecting end peripheral surface on the piping side to the protruding peripheral surface portion on the other end side of the branch pipe, and the branch pipe is connected to the one end side. Using the stepped reduced diameter part provided, weld the solder to the circumferential surface of the through hole, and then apply a similar stepped reduced diameter part provided near the connection end on the piping side to a position that extends into the wall thickness of the through hole. The gist is a solder welding fixing structure between a small diameter metal pipe end and a connecting end fitting, which is constructed by brazing and welding the mutual overlapping peripheral surfaces formed by the branch pipe in a state where they are inserted and engaged. Since the branch pipe has a double wall structure that overlaps with each other over almost the entire length near the continuous end of the pipe, the mechanical strength against cracks and breakage near the stepped part of the branch pipe is significantly reduced. In addition, it can effectively prevent cracks and breakage even when it is forcibly assembled when it hits the seat surface unevenly, or when it is installed and used under vibration conditions.

(Embodiment) Next, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2. The end fitting main body 1 has assembly holes 2, 2 in the shaft core portion communicating with the internal annular groove passage 3. ¹ are concentrically penetrated to form an assembly bolt hole, and the outer peripheral edge of the assembly hole forms a parallel flat seating surface 4, 4 ¹ , and a hole penetrates into the inside provided in the peripheral side wall. The stepped reduced diameter part of a separate short branch pipe 6 having a stepped reduced diameter part at one end is soldered to the circumferential surface of the through hole 5, and the other end is welded to the circumference of the through hole 5. The side is configured to protrude outward, and a similar stepped diameter reducing part provided near the connecting end of the pipe P is inserted and engaged to a position extending inside the wall thickness of the through hole 5. The overlapping peripheral surfaces of the branch pipe 6 and the branch pipe 6 are welded together with solder 8.

(Function) Since the present invention is configured as described above, the structure of the stepped diameter reducing part similar to the stepped diameter reducing part on the side of the branch pipe 6 provided near the connecting end of the pipe P, and the inside thereof are provided. By inserting the stepped diameter-reduced part on the side of the pipe P, which is soldered 8 to the circumferential surface, to a position that extends into the wall thickness of the through-hole 5 and configuring them in an overlapping state, the interaction with the branch pipe 6 is improved. The overlapping peripheral surface of the double-walled welded 8 structure is constructed.

(Effects of the invention) As explained above, the brazed welding fixing structure according to the invention has a double wall with the vicinity of the connection end of the pipe P over the overlapping peripheral surface with the branch pipe 6 including the stepped diameter reduction part. Due to the soldered weld 8 structure, the mechanical strength against cracks and breakage near the stepped part on the side of the branch pipe 6 is significantly increased, and naturally the bending shape of the product may vary, or unreasonable contact may occur due to defects. Even when assembled or used under vibration conditions,
This is an extremely useful welding structure for fixing the end of a small-diameter metal pipe and a connecting end fitting, which can effectively prevent the occurrence of cracks and breakage.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention in which the end of a small-diameter metal pipe and a connecting end fitting are connected with a brazed welding fixing structure, and FIG. 2 is a view taken along line A-A in FIG. Partially cut away sectional view, FIG. 3 is a partially cutaway sectional view showing a conventional example. 5... Through hole, 6... Branch pipe, 8... Solder welding, P
……Piping.

Claims (1)

[Scope of utility model registration request] An assembly hole that communicates with the internal annular concave groove is provided concentrically through the shaft core, and the outer peripheral edge of the assembly hole is a parallel flat seating surface, and an inner portion is provided on the peripheral side wall. One end of a separate short branch pipe is soldered to the circumferential surface of the through-hole to the hole, and the other end protrudes outward to form an end fitting main body. In the fixing structure formed by overlapping and welding the peripheral surface of the connection end on the piping side to the protruding peripheral surface on the end side, the branch pipe 6 is formed into a through hole with a stepped diameter reducing part provided on one end side. With the solder welding 7 attached to the circumferential surface of the hole 5, and a similar stepped diameter reducing part provided near the connection end on the side of the pipe P being inserted and engaged to a position extending inside the wall thickness of the through hole 5, A structure for fixing a small-diameter metal pipe end portion and a connecting end fitting by soldering, characterized in that the overlapping peripheral surfaces formed by the branch pipe 6 are formed by soldering 8.