JPH0341187Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention is generally applicable to automobiles, various machines,
The end of a metal pipe with a wall thickness of approximately 2 m/m or less and the joint body, which is a relatively small pipe with a diameter of approximately 30 m/m or less and is often installed as a supply path for oil supply, air supply, exhaust, etc. in equipment, etc. This invention relates to an improvement in the connection structure of.

[Prior Art] Conventionally, as shown in FIG. 5, for example, this type of connection structure has a stepped diameter enlargement in the connection direction, which is connected to a communication hole 12 inside the axis of a joint body 11 having a desired shape. The end of the pipe P' side was inserted into the port 12 and the member, and the overlapping peripheral surfaces of the pipe were welded W by hand using a burner or the like or using a heating furnace.

[Problems to be solved by the invention] However, in the case of such a connection structure using the solder welding W, the entire product including the pipe P' must be made of corrosion-resistant material after the soldering work with the joint body 11. In connection with this requirement, for example, electroplating of zinc or zinc alloys has to be performed, which increases the number of man-hours required for electroplating and hinders productivity due to the hassle of handling. . In addition, in the electroplating process, the distance between the electrodes and the current density cannot be kept constant;
This leads to variations in the electroplating film thickness, resulting in poor reliability in terms of quality, and there are other problems such as the need for sufficient electroplating processing time to absorb the variations in the electroplating film thickness. Furthermore, in hand-broiling work, the welding work is caused by local heating, which often causes deterioration of the mechanical strength of the pipe P′ due to overheating, etc. In addition, there was a problem in that it caused cracks and breakage near the welded part.

In order to extremely effectively solve the above-mentioned conventional problems, the present invention has a flange that is attached to the inner side near the connecting end of the piping and abuts against the front surface of the protruding wall provided at the end of the piping on the tip side. A cylindrical member having a wall is press-fitted, an elastic seal ring member is engaged with the back surface of the protrusion wall, and a stepped expansion member on the side of the joint main body is fitted with a pressing member inserted from the outside of the elastic seal ring member. The cylinder wall end is bent by caulking or the like after being inserted into the diameter part, and the pressing member is pressed forward, and the elastic seal ring member is compressed by the pressing force and tightly engages with the opposing circumferential surface. By configuring
It eliminates the need for soldering work at the time of connection, allows the use of joint bodies and piping that have been plated in advance, and significantly improves productivity by eliminating the need for subsequent plating work and simplifying handling. With,
By keeping the quality of the plating film constant and increasing the rigidity near the connection end due to the press-fitted cylindrical member, fatigue stress caused by vibration near the connection on the piping side is reduced and cracks are prevented. It is an object of the present invention to propose a connection structure that can prevent breakage and at the same time reliably exhibit the airtight effect due to the deformation of the elastic seal ring member even in the case of extremely thin-walled piping.

[Means for Solving the Problems] The present invention provides a joint main body having a stepped enlarged diameter opening in the connection direction connected to the flow hole inside the shaft core, and a stepped enlarged diameter opening at the end on the piping side. In the structure formed by inserting and connecting the pipe, an elastic seal ring member is engaged with the back surface of the annular protrusion wall provided at the end on the piping side,
Further, a ring-shaped or sleeve-shaped pressing member 5 is incorporated from the outside of the elastic seal ring member, and a cylindrical member having an annular flange wall that abuts and engages with the front surface of the protrusion wall on the tip side is attached to the piping side. is inserted into the stepped enlarged diameter opening on the side of the joint body while being press-fitted inside near the connecting end of the pipe, and the end of the cylinder wall forming the stepped enlarged diameter opening is bent inward. The connection structure between the end of the small diameter metal pipe and the joint body is constructed by pressing the pressing member forward to compress the elastic seal ring member and closely engaging the opposing circumferential surface. The outer circumferential surface of the annular flange wall of the cylindrical member is press-fitted into the inner circumferential surface of the stepped enlarged diameter opening, and the pressing member is provided at the rear end of the pressing member outwardly. It is constructed with a flange wall.

[Example] Hereinafter, an example of the present invention will be described based on the drawings. Fig. 1 shows a connection state in which a multi-way joint has a connection structure between a small diameter metal pipe end and a joint body according to the present invention. A partially cutaway sectional view, FIG. 2 is a partial sectional view of the main part of the present invention showing another embodiment, FIG. 2a
and b are sectional views showing other embodiments of the cylindrical member, and FIG. 3 is a second sectional view showing still another embodiment of the present invention.
FIG. 4 is a plan view of a single elastic seal ring member, in which 1 is a straight shaft joint, an eye joint, which has a stepped enlarged diameter opening 2' in the connection direction connected to a communication hole 2 inside the shaft core; The joint body 3 has a desired shape such as an elbow joint or a multi-way joint, and 3 is an annular protrusion wall extending outward by double bending or the like, which is provided at the end of the piping P which has been plated in advance. An elastic seal ring member 4 made of rubber, resin, etc. is engaged with the back surface of the wall, and a pressing member in the form of a ring (Fig. 2) or a sleeve (Figs. 1 and 3) is located outside of the elastic seal ring member 4. In addition to incorporating the member 5, a cylindrical member 6 having an annular flange wall 6' that abuts and engages with the front surface of the protruding wall 3 on the distal end side is press-fitted into the inside of the pipe P near the connecting end. In this state, it is inserted into the stepped enlarged diameter opening 2' on the side of the joint body 1, and the cylinder wall end 1' forming the stepped enlarged diameter opening is bent inward by caulking or the like. By pressing the pressing member 5 forward, the elastic seal ring member 4
is compressed and closely engaged with the inner circumferential surface on the opposing cylinder wall side and the outer circumferential surface on the piping P side.

The inner cylindrical surface of the cylindrical member 6 on the side of the pipe P is formed into a tapered wall 6'' as shown in FIG.
It is preferable to provide axial slits 6 or radial slits 6'''' with gradually increasing intervals on the pipe P side of the cylindrical member 6 as shown in b, since stress concentration can be alleviated. annular brim wall 6'
The outer circumferential surface of the pressing member 5 is press-fitted into the inner circumferential surface of the stepped enlarged diameter opening 2', and the rear end of the pressing member 5 is integrally provided with an outwardly extending flange wall 5'. is preferable, and the seal ring member 4 can be easily inserted into the proper position by pressing the flange wall 5' forward.

[Function] Since the present invention is constructed in this way, it is possible to easily connect the pressing member 5 by pressing it toward the front of the axis, and it is also possible to connect the pressing member 5 by plating each unit in advance. The joint body 1 and the piping P can be used and the connection can be made easily. Furthermore, the increased rigidity near the connecting end due to the press-fitted cylindrical member 6 reduces fatigue stress due to vibration near the connecting end on the pipe P side, and improves airtightness. Further, due to the airtight connection structure formed by compressing and clamping the elastic seal ring member 4, adjustment can be made by rotating the mating member against mutual torsion during connection, and the connection can be made without difficulty.

[Effects of the invention] As explained above, the connection structure according to the invention has the following effects:
Particularly, with the cylindrical member 6 having an annular flange wall 6' that abuts and engages the front surface of the protruding wall 3 on the tip end side pressed into the inside near the connecting end on the piping P side, the elastic seal ring Since the member 4 is compressed by forward pressing by the pressing member 5 and closely engaged with the opposing circumferential surface, there is no need for heat soldering at the time of connection, and each member is pre-plated. This makes it possible to use the joint body 1 and the piping P, eliminates the need for subsequent plating treatment, and allows for easy handling, which significantly improves productivity.
By keeping the quality of the plating film constant and reducing fatigue stress near the connection, the piping P near the connection
It sufficiently reinforces the mechanical strength of the side and relieves stress concentration, preventing cracks and breakage caused by vibration.At the same time, even in extremely thin-walled pipes, the deformation of the elastic seal ring member 4 provides an airtight effect. This is an extremely useful connection structure between the end of a small-diameter metal pipe and the joint body that can reliably exhibit the following properties.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway sectional view showing a connection state in which a multi-way joint has a connection structure between the end of a small-diameter metal pipe and the joint body according to an embodiment of the present invention, and Fig. 2 is a cross-sectional view of another embodiment of the present invention. FIGS. 2a and 2b are sectional views showing other embodiments of the cylindrical member, and FIG. 3 is a sectional view showing still another embodiment of the invention.
FIG. 4 is a plan view of the elastic seal ring member, and FIG. 5 is a partially cutaway sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Joint body, 1'... Cylinder wall end, 2'... Stepped enlarged diameter opening, 3... Annular protrusion wall, 4... Elastic seal ring member, 5... Pressing member, 5'... Tsuba wall,
6... Cylindrical member, 6'... Flange wall, P... Piping.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. The pipe-side end is inserted into the stepped enlarged diameter opening of the joint body, which has a stepped enlarged diameter opening in the connection direction that connects to the flow hole inside the shaft core. In the connected structure, an elastic seal ring member 4 is provided at the end on the side of the pipe P and is engaged with the back surface of the annular protruding wall 3, and a ring-shaped or sleeve-shaped pressing member is further applied from the outside of the elastic sealing member. In addition to incorporating the member 5, a cylindrical member 6 having an annular flange wall 6' that abuts and engages the entire surface of the projection wall 3 on the tip side is press-fitted inside near the connecting end on the piping P side. The pressing member 5 is then inserted into the stepped enlarged diameter opening 2' on the side of the joint body 1, and the cylinder wall end 1' forming the stepped enlarged diameter opening is bent inward to move the pressing member 5 forward. A connection structure between a small-diameter metal pipe end and a joint body, characterized in that the elastic seal ring member 4 is compressed and closely engaged with the opposing circumferential surface. 2 Utility Model Registration Scope of Claim 1 As stated in claim 1, the outer circumferential surface of the annular flange wall 6' of the cylindrical member 6 is
A connection structure between a small-diameter metal pipe end and a joint body, characterized in that it is press-fitted onto the inner circumferential surface of a stepped enlarged diameter port 2'. 3 Utility Model Registration Scope of Claim 1 The end of a small diameter metal pipe, characterized in that the pressing member 5 is configured to have an outwardly extending flange wall 5' at the rear end of the pressing member. Connection structure between the section and the fitting body. 4 Utility Model Registration Scope of Claim 1 The connection between the end of a small diameter metal pipe and the joint body, characterized in that the inner circumferential surface of the cylindrical member 6 on the side of the pipe P is formed into a tapered wall 6''. Structure. 5 In the utility model registration claim 1, a slit 6 is provided on the piping P side of the cylindrical member 6.
, 6''''' is provided. A connection structure between a small diameter metal pipe end and a joint body.