JPH0355028Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention is generally applicable to automobiles, various machines,
A mating joint body at the end of a metal pipe with a wall thickness of approximately 2 m/m or less, consisting of a relatively small diameter pipe of approximately 30 m/m or less, which is often installed as a supply path for oil and air supply to equipment, etc. , or relates to improvements in connection and fixing structures to base bodies and the like.

[Prior Art] Conventionally, as shown in FIG. 4, this type of connection and fixing structure includes a joint body having a desired shape;
Alternatively, the piping can be connected to the stepped enlarged diameter opening 22' in the connection direction, which is connected to the communication hole 22 inside the axis of the base body 21.
With the connecting end on the P' side inserted, the mutually overlapping peripheral surfaces are connected and fixed by hand roasting with a burner or the like, or by heating welding W in a furnace.

[Problems to be solved by the invention] However, in the case of such a connection and fixing structure using heat soldering W, after the soldering work with the mating member consisting of the joint body or the base 11, etc. In order to meet the requirements for corrosion resistance, the entire product, including the pipe P', must be electroplated with zinc or zinc alloy, which increases the number of man-hours required for electroplating.
At the same time, productivity was hindered due to the troublesome handling. In addition, in the electroplating process, the distance between the electrodes and the current density cannot be made constant, leading to variations in the thickness of the electroplating film, resulting in poor reliability in terms of quality. This method had problems such as the need for time.

Furthermore, during hand-broiling work, the local heating causes the welding work, which often causes damage to the piping.
This causes deterioration of the mechanical strength on the P' side, and together with the installed engine or mechanical vibration, there is a problem that cracks and breakage occur in the vicinity of the solder welded part on the piping side.

In order to extremely effectively solve the above-mentioned conventional problems, the present invention alternately arranges vibration absorbing ring members and elastic seal ring members on the outer periphery of the back surface of the annular protrusion wall provided at the connection end on the piping side. or at least one elastic seal ring member, and further, a sleeve and a pressing member that abuts the at least one elastic seal ring member, or a pressing member and a sleeve are sequentially assembled on the outside thereof. The vicinity of the connecting end is inserted into the stepped enlarged diameter opening on the mating member side, and the pressing member is pressed forward while the cylinder wall end circumference is bent inward, and the vibration is caused by the pressing. By compressing the absorbing ring member and the elastic seal ring member, or by compressing the single elastic seal ring member and closely engaging the opposing circumferential surfaces, there is no need for any heat welding work at the time of connection. It enables the use of plated mating parts and piping, eliminates the need for plating after connection, and allows for easy handling, which significantly improves productivity and maintains a constant quality in terms of plating film thickness. It is an object of the present invention to provide a connection fixing structure that can reduce and prevent cracks and breakage without worrying about deterioration of mechanical strength near the connection part.

[Means for Solving the Problems] The present invention provides a mating member having a cylindrical wall having a stepped enlarged diameter opening in the connection direction that is connected to a communication hole inside the shaft center, and a connecting end is provided inside the enlarged diameter opening. At least one elastic seal ring member, a pressing member, and a sleeve having an outwardly pressing flange wall at the tip are incorporated in the outer periphery of the back surface of the projecting wall on the piping side having an outwardly annular projecting wall at the end thereof. The pressing member is inserted and fitted forward, and the end periphery of the cylindrical wall constituting the enlarged diameter opening is bent inward, compressing the elastic seal ring member and compressing the opening periphery on the enlarged diameter opening side. The main feature is a connection and fixing structure for the end of a small diameter metal pipe that is configured to be connected in close engagement with the outer peripheral surface of the piping side, and further includes a vibration absorbing ring member disposed on at least one end surface of the elastic seal ring member. Further, an enlarged diameter portion is formed at a tip end portion on the piping side, and a reduced diameter portion is formed in pressure contact with the outer periphery of the piping at the rear end side of the sleeve incorporated in the outer periphery of the piping, and , the pressing member has an outwardly extending flange wall at the peripheral edge of the rear end thereof.

[Example] Hereinafter, an example of the present invention will be described based on the drawings. Fig. 1 is a longitudinal sectional view with a partial cutout showing the connection and fixing structure of the thin metal tube end of the present invention, and Fig. 2 3 and 3 are partially cutaway longitudinal cross-sectional views of the same as the above, respectively, showing other embodiments, in which 1 is a cylinder having a stepped enlarged diameter opening 2' in the connection direction connected to the communication hole 2 inside the shaft center. A mating member consisting of a joint body of a desired shape with a wall 1' or a base body, etc. 3 is an outward annular protruding wall formed by double bending or the like provided at the connecting end of a pipe P which has been previously plated. At least one vibration absorbing ring member 4 made of an elastic material such as metal, rubber, resin, etc. and an elastic sealing ring member 5 made of rubber, resin, etc. are arranged alternately on the outer periphery of the rear surface of the projecting wall. (FIG. 1) or, preferably, at least one elastic seal ring member 5 having a vibration absorbing function (FIG. 2), and furthermore, an outer ring provided at the tip thereof is provided on the outside thereof. Either the vibration absorbing ring member 4 or the elastic seal ring member 5 located at the rear of the arranged and engaged pressing flange wall 6', or the sleeve 6 that abuts the single elastic seal ring member 5. Either insert the cylindrical pressing member 7 from the outside (first
(Fig. 2), or with the pressing member 7 inserted and the sleeve 6 assembled from the outside (Fig. 2), the vicinity of the connecting end is inserted into the stepped enlarged diameter opening 2' on the mating member 1 side. The pressing member 7 is pressed forward to bend the end circumferential portion 1'' of the cylindrical wall 1' forming the enlarged diameter opening 2' inwardly by caulking or the like,
By engaging with the pressing member 7 or the pressing flange wall 6' of the sleeve 6, the vibration absorbing ring member 4 and the elastic seal ring member 5, or the single elastic seal ring member 5, are compressed and the opposing diameters are expanded. It is formed by closely engaging the mouth peripheral surface on the mouth 2' side and the outer peripheral surface on the piping P side. Reference numeral 7' denotes an outwardly extending flange wall integrally formed on the peripheral edge of the rear end of the pressing member 7.
Furthermore, in order to increase the mechanical strength near the connection end on the side of the pipe P, it is also possible to configure it as shown in FIG. 3.

That is, in FIG. 3, the connecting end of the pipe P is provided with an enlarged diameter part 9 through the tapered wall 8, and the sleeve 6 incorporated in the outer peripheral part of the pipe P is provided with an enlarged diameter part 9 that is inclined from the tapered wall 8 of the pipe P. A reduced diameter portion 11 is provided through a gently tapered wall 10, and the inner circumferential surface of the reduced diameter portion 11 is tightly engaged with the outer circumferential surface of the pipe P.
Incidentally, it is preferable that a cylindrical sliding member 12 is provided in the close engagement portion.

In addition, the vibration absorbing ring member 4 is provided with a notch (not shown) throughout its thick wall, and the sleeve 6 is provided with a thin inclined surface 13 (not shown) on the outer peripheral surface toward the rear end. 1), an axial or radial slit (not shown) is preferably provided near the rear end, or a thin inclined surface and a slit are preferably combined.

[Function] Since the present invention is configured as described above, when connecting the pipe P, the vicinity of the connecting end on the side of the pipe is inserted into the enlarged diameter opening 2' of the mating member 1, and the pressing member 7 The connection can be easily made by pressing forward and inwardly bending the end circumference 1'' on the side of the cylinder wall 1'. P can be used and the connection can be made easily.Furthermore, the front sleeve 6 and the pressing member 7, which are assembled in a fitted manner, can be used.
Alternatively, depending on the structure of the pressing member 7, the rigidity near the connection end on the piping P side is increased, and the vibration absorbing ring member 4 and the elastic seal ring member 5, or the elastic seal ring member 5, are alternately arranged and engaged. This results in a reduction in fatigue stress near the connection end. In addition, due to the compressive deformation of the wrapping-like close connection fixing structure, the rotational direction can be adjusted against mutual torsion during connection, and the connection can be made without difficulty.

[Effects of the invention] As explained above, the connection and fixing structure according to the invention includes at least one vibration absorbing ring member 4 and at least one elastic seal ring member 5, or at least one elastic seal ring member 5, which are alternately arranged and engaged on the outer circumference of the pipe P side. At least one elastic seal ring member 5 that is engaged with the outer circumferential portion and preferably has a vibration absorbing function is assembled with a sleeve 6 and a pressing member 7, and is pressed forward by the pressing member 7, by being in a supported state. compression deformation,
Because the connection is configured by closely engaging the opposing circumferential surfaces,
It eliminates the need for hot soldering work at the time of connection, allows the use of each mating member 1 and piping P that have been plated in advance, eliminates the need for plating after connection, and is extremely easy to handle. Productivity can be improved, the quality of the plating film can be kept constant, and the mechanical strength near the connection end on the piping P side can be increased to reduce and prevent cracks and breakage caused by vibration. This is an extremely useful structure for connecting and fixing the ends of small diameter metal pipes.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view, partially cut away, of a connection and fixing structure for the end of a small diameter metal tube, showing an embodiment of the present invention;
2 and 3 are partially cutaway longitudinal sectional views of the same as the above, showing other embodiments, respectively, and FIG. 4 is a partially cutaway longitudinal sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1...Mating member, 1'...Cylinder wall, 1''...End peripheral part, 2...Flow hole, 2'...Diameter opening, 3...Annular protrusion wall, 4...Vibration absorbing ring member, 5... Elastic seal ring member, 6... Sleeve, 6'... Pressure flange wall, 7... Pressing member, 7'... Flam wall, P...
Piping.

Claims (1)

[Claims for Utility Model Registration] 1. Inside the enlarged diameter opening of the mating member 1, which is provided with a cylindrical wall 1' having a stepped enlarged diameter opening 2' in the connecting direction and connected to the communication hole 2 inside the shaft center, At least one elastic seal ring member 5 is provided on the outer periphery of the back surface of the protruding wall on the side of the pipe P which has an annular protruding wall 3 protruding outward at the connecting end, a pressing member 7 and an outward pressing flange wall at the tip end. The sleeve 6 having a diameter of 6' is assembled and inserted, and the pressing member 7 is pressed forward, and the end peripheral part 1'' of the cylinder wall 1' forming the enlarged diameter opening 2' is bent inward. , the elastic seal ring member 5 is compressed to seal the opening circumferential surface on the expanded diameter opening 2' side and the piping P.
A connecting and fixing structure for the end of a small diameter metal tube, characterized in that the connection is configured by closely engaging with the outer peripheral surface of the side. 2 Utility Model Registration Scope of Claim 1 The structure for connecting and fixing an end of a small diameter metal pipe as set forth in claim 1, characterized in that a vibration absorbing ring member 4 is disposed on at least one end surface of the elastic seal ring member 5. 3 Utility Model Registration Scope of Claims 1. In the invention, an enlarged diameter portion 9 is formed at the tip of the pipe P, and a diameter enlarged portion 9 is formed at the rear end of the sleeve 6 incorporated into the outer circumference of the pipe P. A structure for connecting and fixing an end of a small diameter metal pipe, characterized in that a reduced diameter part 11 is formed in pressure contact with the outer peripheral part of a metal pipe. 4 Utility model registration Claim 1, wherein the connection of the end of a small diameter metal tube is characterized in that the pressing member 7 has an outwardly facing flange wall 7' at the peripheral edge of the rear end thereof. Fixed structure.