JPS63183822A - Method for connecting joint to hose - Google Patents

Abstract

PURPOSE:To eliminate machining work and facilitate the manufacture and at the same time contrive to reduce the weight of joining and connect a joint to a hose by a method wherein a metallic fixing piece is fixed to the end of the hose and, after that, covered with synthetic resin. CONSTITUTION:A cushioning medium 21, in which a core bar 22 is inserted, is inserted in the center hole of a hose 20, which is inserted in a fixing metal piece 23. Punches 26, at the tip of which clamping blocks 27 are protrusively provided, are pressed towards the center of the hose 20 so as to produce clamping marks by plastically deforming the outer periphery of the metal piece 23. At that time, turned-up parts 24 and 25 are left at both the side ends of the metal piece 23. After that, the cushioning medium 21 and the core bar 22 are pulled out of the hose. Molds 30 and 31 are brought into close contact with each other so as to set the hose 20 in the molds 30 and 31 under the state that a protective bar 36 is inserted in the center hole of the hose 20 and further an oil hole bar 37 is inserted from the left side into the mold 30. After that, molten synthetic resin is poured from a locating ring 35 so as to fill cavities 32 and 33 and cured in order to form a joint 40 integrally.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a flexible hose made of rubber, for example, in which a synthetic resin joint having a threaded portion or a bolt portion is integrally molded at the end of the hose. The present invention relates to a method for connecting a hose and a joint, which allows the hose and the joint to be firmly connected and bonded together.

[Conventional technology]

Conventionally, in the hydraulic systems of automobile suspensions, machine tools, work vehicles, etc., the hydraulic flow path is the pericardium, and the connection parts that require universal connection at the connection intervals are made of rubber hydraulics. Usually a hose was used. This hydraulic hose is connected to a hydraulic pressure supply source and a hydraulic pressure consumption source, and at the same time supplies pressure hydraulic oil, its elasticity absorbs fluctuations caused by vibration and movement, ensuring that pressure hydraulic oil is supplied under any conditions. This is so that it can be supplied. However, in order to connect this elastic hydraulic hose to each connection port of a hydraulic pressure supply source or a hydraulic pressure consumption source, a metal fitting has usually been used at the end of the hydraulic hose.

The structure of this conventional hydraulic hose and fitting and its connection method will be explained with reference to FIGS. 1 to 3.

Figure 1 shows a joint fitting 1.
They used metal materials such as iron, brass, copper, and alloys, and were formed integrally by forging or cutting the materials. The center outer periphery of this joint fitting l is formed into a hexagonal shape to allow a wrench to engage, and has a bolt part 2, and a threaded part 3 is formed adjacent to this bolt part 2. A male screw 4 for screwing into a screw hole of a hydraulic pressure supply source or a hydraulic pressure consumption source is cut on the outer periphery. A sleeve hole 5 with a slightly larger diameter is drilled in the center of this threaded portion 3 up to the vicinity of the bolt portion 2. Further, on the right side of the bolt part 2, a hole 866 is opened at its center with its central axis aligned with the axis of the joint fitting l, and the sleeve hole 5 and the end part 866 communicate with each other. Fitting fitting 1 through sleeve holes 5 and 86
The oil passage is opened through from the left end to the right end. An introduction pipe 7 is formed on the outer periphery of the eight holes 6.
The outer shape is almost the same as the inner diameter of the hose 1O, which will be described later. A cylindrical skirt portion 8 with a slightly larger diameter is formed on the right side of the bolt portion 2, and the 866, introduction pipe 7, and skirt portion 8 have their respective axes bent once, and are concentric circles. It is placed on top. Thereby, a ring-shaped holding space 9 reaching up to the bolt part 2 is formed by the outer circumference of the introduction pipe 7 and the inner circumference of the skirt part 8. Note that the inner circumferential diameter of the skirt portion 8 is approximately the same as the outer circumferential diameter of the hose, which will be described later.

To connect the hose 10 using this joint l, first
Insert the hose 10 into the holding space 9 from the right side of the joint fitting 1 in the figure. The inner peripheral surface 11 of the hose 10 is the introduction pipe 7
The outer circumferential surface 12 of the hose 10 is in close contact with the inner circumferential surface of the skirt portion 8. Then, when the hose IO is inserted into the holding space 9 to its innermost end, tightening is performed by pressing the punch 14 having the piece 13 from the periphery and pushing the vicinity of the center of the outer periphery of the skirt portion 8 toward the hose IO side. Perform the caulking work, at this time punch 1
Six to eight pieces 4 are arranged radially around the joint l, and the pressing force is applied evenly to the outer periphery of the skirt part 8. The structure for driving the punch 14 having the piece 13 for this tightening is conventionally known and is operated by hydraulic pressure or the like. After the piece 13 is tightened by the punch 14 against the fitting l, the skirt part 8 is plastically deformed toward the hose lO side due to the metal properties of the fitting l, as shown in FIG. is deformed, and caulking marks 15 are formed that dig into the outer peripheral surface of the hose 10. For this reason, the skirt portion 8
The hose lO is firmly fixed in the holding space 9 by the caulking marks 15, and even if high pressure hydraulic oil is applied to the hose lO, there is no risk of it leaking or falling off between the fitting l and the hose lO. It is.

However, when connecting such conventional rubber hoses and metal fittings, the following drawbacks have occurred.

Since the il+ fitting 1 is fixed by sandwiching the inside and outside of the hose 10 as described above, the introduction pipe 7 and the skirt portion 8 are required, making the structure complicated. For this reason, solid metal must be cut and processed, resulting in an extremely large number of processing steps.

(2) As mentioned above, since the structure of the joint fitting l is complicated, its manufacturing cost becomes high.

(3) The fittings l are heavy because they are made of metal materials such as iron, and if a large number of fittings are used, the weight will increase.
This results in an increase in the weight of the entire vehicle body, such as an automobile, and reduces performance such as acceleration characteristics and fuel efficiency characteristics.

(4) The fitting 1 and the hose 10 are made of metal and rubber, which are extremely incompatible materials, and when used for a long period of time or when high pressure is applied, pressure hydraulic oil may leak from the fitting 1 and the hose 10. There is a risk of it falling off, falling off, or being damaged.

(5) Since the fitting l and the hose lO are metal products and rubber products, respectively, they must be processed separately, and processing and assembly must be done in separate work processes. is significantly hindering.

As described above, there are many drawbacks to connecting the conventional fitting l to the hose lO.

[Problems to be Solved by the Invention] In order to connect a conventional hydraulic hose and a fitting, as mentioned above, there are disadvantages inherent to the fitting, which cannot be avoided since the fitting is made of metal. It was a fatal injury. For this reason, it would be best if the hydraulic hose could be connected directly to the hydraulic supply source or hydraulic consumption source.
Since hydraulic hoses are elastic, it has been difficult to connect them directly.Therefore, it has been desired to integrally form a joint at the tip of the hydraulic hose.

[Means for solving problems]

In view of the above-mentioned drawbacks, the present invention provides a joint made of synthetic resin, in which a metal fixture is fixed to the end of a flexible hollow hose, and the entire fixture is embedded from the end of the hose. The present invention provides a method for connecting a hose and a joint, characterized in that the hose is molded.

[Effect]

In the present invention, a metal fixture is first fixed to the end of the hydraulic hose, and a synthetic resin joint is molded to embed the fixture.

For this reason, a synthetic resin joint is formed at the tip of the hydraulic hose, which prevents the hydraulic hose and the joint from falling off, improves the adhesion between the two, and simplifies the connection process between the joint and the hose. Since it can be molded in a process, the manufacturing process can be significantly omitted.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

Natural rubber, synthetic rubber (chloroprene, NR, NBR, etc.)
The hose 20, which is reinforced with braids and wires and supplies hydraulic pressure, is equipped with a cylindrical fixing fitting 23 made of a thin metal material such as iron or brass and having an inner diameter almost the same as the outer diameter of the hose 20. Insert it in the direction shown in Figure 4. When inserting the hose 20 into the fixing fitting 23, applying an adhesive to the contact surfaces between the two will improve the bondability at a later date.

As the adhesive to be applied, for example, Chemilock 210
Good results can be obtained by using epoxy-based or cyanoacrylate-based materials such as , Chemiloc 270 (trade name of Chemilok Co., Ltd.), and Cemedine 11500 (trade name of Cemedine Co., Ltd.). The center hole of this hose 20 is molded with polyurethane, synthetic rubber, etc.
A cushion material 21 whose outer diameter is approximately the same as the inner diameter of the hose 20 and which has a through hole formed in the center is inserted in the direction B in FIG. 4. Then, eight rods 22 made of a metal material such as iron are inserted into the through holes of the cushion material 21. FIG. 5 shows a cross section of the hose 20 assembled according to the procedure shown in FIG. This means that the hose 20 and the fixture 23 are arranged concentrically in this order. The end surface of the fixing fitting 23 is positioned a little apart from the end surface of the hose 20, and the tip of the cutter material 21.8 rod 22 is flush with the tip of the hose 20. The thus assembled hose 20 and fixture 23 are tightened using a conventionally known tightening device.

FIG. 6 shows the tightening method. Punches 26 are positioned around the fixing fitting 23 at equal intervals in eight directions, and a tightening piece 27 protrudes from the tip of each punch 26. It's a shame. When these punches 26 are pushed with uniform force toward the center of the hose 20 using hydraulic pressure or the like, the pieces 27 are pressed against the circumferential surface of the fixing metal fitting 23 and the fastening metal fitting 2 is tightened.
3 will be plastically deformed by the piece 27 during tightening.

FIG. 7 shows the tightening by the punch 26 after processing, and there are traces of plastic deformation on the outer periphery of the fixing metal fitting 23, which were pressed from eight directions at equal intervals by the pieces 27.
A mark 28 is formed by tightening the eight pieces in two rows, each having a slightly rectangular shape. Also, each side end of the fixing metal fitting 23 is provided with a punch 26.
It warps due to the reaction caused by the pressing force, leaving trumpet-shaped curled portions 24 and 25. This tightening causes the inner surface of the fixture 23 to bite into the outer periphery of the hose 20 due to the marks 28, thereby firmly holding the hose 20 and the fixture 23 so that they do not come off. In addition, when inserting the cushion material 21 and the 8 rods 22 into the inside of the hose 20, the tightening is done by the piece 2.
The tightening by 7 prevents the center hole of the hose 20 from being blocked during operation. When the tightening work with the punch 26 is completed, pull out the cutter material 21 and the 8-rod 22 in the direction shown by C in FIG.
Make the inside of the hole hollow.

Next, after fixing the fixture 23 to the hose 20, the process moves on to injection molding the joint.

Here, numerals 30 and 31 in FIG. 8 are molds, and a cavity 32 in which a bolt portion and a threaded portion are formed is formed inside the mold 30. Further, a cylindrical cavity 33 having a shape corresponding to a skirt portion is formed inside the mold 31, and a gate 34 communicating with the outside of the mold 31 is communicated with the cavity 33. . A locate ring 35 is connected to the gate 34. Then, the molds 30 and 31 are brought into close contact with each other, and the hose 20 is inserted from the side of the metal 23t and fixed.
3 is located inside the cavity 33.

After the mold 30 is brought into close contact with the side surface of the mold 31, a protection rod 36 having an outer diameter approximately the same as the inner diameter of the hose 20 is inserted into the center hole of the hose 20, and the tip of this protection rod 36 is fixed to the A sleeve hole rod 37 is placed near the center of the metal fitting 23 and inserted from the left side of the mold 30, the outer diameter of which is approximately the same as the inner diameter of the oil-filling hole of the joint. It crosses the center and reaches the end face of the hose 20. The tip of this sleeve hole rod 37 is a protective portion 38 whose outer diameter is the inner diameter of the center hole of the hose 20. This protective portion 38 is inserted from the opening at the tip of the hose 20, and the tip of the protective portion 38 is in close contact with the tip of the protection rod 36. Moreover, the space between the cuff hole rod 37 and the protection part 38 is formed in a tapered shape. Therefore, the space formed by the cavities 32, 33, the hose 20, and the armhole rod 37 has a shape that almost matches the outer shape of the joint. In addition, hose 2
0 into the mold 31, applying an adhesive to the outer periphery of the fixing metal fitting 23 in order to improve the bonding property between the fixing metal fitting 23 and the synthetic resin will improve the bonding property at a later date. Examples of the adhesive to be applied include Chemiloc 210 and Chemiloc 270 (trade name of Chemiloc Co., Ltd.).
Good results can be obtained by using epoxy or cyanoacrylate materials such as Cemedine #1500 (trade name of Cemedine). In this way, mold 3
With the hose 20 set at 0.31 mm and the protective rod 36 and armhole 37 inserted, heated and melted synthetic resin is injected from the locate ring 35 under pressure in the downward direction in the figure. This synthetic resin is, for example, glass fiber-filled nylon, polyoxyphenylene, Noryl (Go+5ral
Infused synthetic resins, preferably using materials with capabilities such as high tensile strength, creep resistance, high modulus, heat resistance, etc. passes through the gate 34, fills the cavity 32.33, cools and solidifies within the cavity 32.33.

When the synthetic resin hardens within the cavities 32, 33, the joint 40 will be integrally molded. Once the fitting 40 has cooled and solidified, the sleeve hole rod 37 is pulled out from the mold 30, the protection rod 36 is pulled out from the hose 20, and the mold 30.
will be exposed.

FIG. 9 shows the cross-sectional structure of the hose 20 and the joint 40 formed by this process. In the joint 40 made of synthetic resin, a bolt part 41 is molded in the shape of a brim at the outer periphery of the center, and a connecting part 42 that wraps around the fixing fitting 23 is molded on the hose 20 side, and the opposite side of the bolt part 41 is molded. This means that a threaded portion 43 is formed on the side. Moreover, an oil container 44 that penetrates and opens to the center of the bolt portion 41 remains at the site where the sleeve hole rod 37 is pulled out, and this oil container 44 communicates with the center hole inside the hose 20. The connecting portion 42 is tightly attached to the fixing fitting 23 and is solidified to wrap around the fixing fitting 23, so that the connecting portion 42 and the fixing fitting 23 will not leak or fall off when pressurized. The fixing fittings 23 and the hose 20 are the same as the punch 2 described above.
When tightened by the deformation process in step 6, the two are engaged by the marks 28, and the fixing fitting 23 and the hose 20 will not be pulled out.In this way, the synthetic resin joint 40 is integrally attached to the end of the hose 20. As a result, they are molded and joined, eliminating the need for metal processing and other processes.

In addition, although the joint 40 was formed by injection molding in this example, the method of the joint 4 is not limited to this example.
The same effect can be obtained even if 0 is formed by press molding.

Furthermore, in this embodiment, in order to fix the hose 20 to the joint 40, a pipe-shaped fixing fitting 2 is provided as shown in FIG.
3 is used; however, the present invention is not limited to this embodiment, and any metal material can be used as long as it is fixed to the end of the hose 20, bit into the hose 20, and embedded in the synthetic resin. For example, as shown in FIG. Let me defeat this fixing metal fitting 5
0 into the hose 20, the tightening may be done by caulking the fixing fitting 50 to the hose 20 by machining.

Furthermore, FIG. 11 shows another embodiment,
A fixed coil 51 made of a thin metal rod wound into a coil shape is used. This fixed coil 51 is connected to the hose 2
0, the outer periphery of the fixed coil 51 is tightened with a punch, and the same effect can be obtained by fixing the fixed coil 51 by biting it into the hose 20. Needless to say.

〔Effect of the invention〕

Since the present invention is configured as described above, a metal fixture is fixed to the end of the rubber hose, and a synthetic resin joint is molded to wrap around the fixture. From this,? There is no need for fittings with a J [91 structure, and an integrated fitting can be formed at the end of the hose by molding with synthetic resin, eliminating the need for processes such as cutting the fittings, making manufacturing extremely easy. This is the result.

In addition, since synthetic resin is used instead of metal fittings, the weight is lighter, and even if a large number of fittings are used, the total weight is reduced, which improves automobile performance such as acceleration and fuel efficiency. improves. In addition, since the synthetic resin is closely attached to the end of the rubber hose, the affinity between the two is good, and the effect is that it will not easily come off. Furthermore, by molding the synthetic resin, it is possible to mold the joint part and connect it to the hose in a single process, which reduces manufacturing costs and makes it suitable for mass production.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the shape of a conventional fitting; Figure 2 is a sectional view showing the caulking process for connecting the conventional fitting to a hose; and Figure 3 is a sectional view showing the shape of a conventional fitting. Fig. 4 is a cross-sectional view showing the connected state, and Fig. 4 shows an example of the repair of the present invention, and is a perspective view showing the state in which the fixing metal fitting is inserted into the hose. 6 is a perspective view illustrating the work of caulking the fixing fittings, FIG. 7 is a perspective view showing the state after crimping, and FIG. 8 is a view of the inside of the mold for injection molding the joint. FIG. 9 is a cross-sectional view showing the relationship between the joint and the hose formed by injection molding, and FIG. 1θ and FIG. 11 are perspective views showing other embodiments of the present invention. It is. 20...Hose, 23.50...Fixing fittings, 40.
...Joint, 51...Fixed coil. Patent applicant Fuji 1)
Honest Representative Patent Attorney Hibi Akira Figure 1 Figure 9 Figure 4I Figure 10 Figure 1I

Claims (1)

[Claims] A hose and a coupling characterized in that a metal fixing fitting is fixed to the end of a flexible hollow hose, and a synthetic resin fitting is molded so that the entire fixing fitting is embedded from the end of the hose. How to connect.