JPH075348Y2 - Hose assembly fittings - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a fitting for a hose assembly, and more particularly, a fitting for a rubber hose assembly for various hydraulic pressures and a resin hose assembly for various hydraulic pressures, such as a power steering hose and a hydraulic pressure. Hose for active suspension,
The present invention relates to a hose assembly for automobiles such as an oil brake hose, an oil hose and a fuel hose, a high pressure hose for various industries, and a fitting for a super high pressure hose assembly.

(Prior Art) In a joint fitting for a hose assembly, for example, a fitting fitting for an assembly used for a power steering hose, a nipple and a sleeve are formed separately for cost reduction.

FIG. 4 and FIG. 5 show an example of a conventional fitting for a hose assembly, and are front views for explaining the upper half in section.

The fitting shown in FIG. 4 is a nipple 1 to be inserted into a hose.
And a sleeve 3 formed concentrically with the nipple 1.
And a metal pipe 5 connected to the nipple 1. The nipple 1 is formed by cutting a round bar on the outer peripheral surface thereof to form a plurality of slip-out preventing chevron projections 7 and brazing projections 9 in the circumferential direction, and the brazing projections 9 are formed on the bottom of the sleeve 3. After being fitted in the through hole 13 formed in 11 and fixed integrally by brazing 15 in the furnace, the rear end portion 17 of the nipple 1 is further fixed.
Is inserted into the metal pipe 5 and similarly connected by brazing 19 in the furnace to manufacture a joint fitting for a hose assembly.

The example shown in FIG. 5 is a case where a metal pipe is fitted inside the nipple. That is, a chevron projection 7a is formed on the outer peripheral surface of the nipple 1a by cutting, and the brazing projection 9a is formed into a sleeve.
After being fitted into the through hole 13a formed in the bottom portion 11a of the 3a and integrally fixed by the furnace brazing 15a, the nipple 1a
The metal pipe 5a is inserted into the assembling part 17a at the rear end part, and is connected by the in-furnace brazing 19a.

(Problems to be solved by the invention) Both the nipple and the sleeve in the joint fitting for the hose assembly described above must be firmly fixed without coming off due to vibration or swing during use.
There are the following problems in manufacturing.

That is, in any of the above-mentioned conventional examples, the nipples 1 and 1a and the sleeves 3 and 3a are fixed to each other by brazing. It needs to be large. Therefore, there is a problem that the cost of the nipple and the sleeve increases.

Also, the nipples 1 and 1a are formed by cutting from a round bar, but the larger the width of the brazing protrusions 9 and 9a, the longer the entire nipples 1 and 1a. There is a problem.

Further, since the metal pipes 5 and 5a are directly connected to the nipples 1 and 1a, when the diameter of the metal pipes is changed, it is necessary to manufacture the nipples corresponding thereto. Since metal pipes require various diameters depending on the equipment, the types of nipples corresponding to them have naturally increased, and it has been impossible to reduce costs by standardization.

The present invention has been made in view of the current situation, and the purpose thereof is to standardize the nipple to reduce costs by reducing material cost and processing cost, and to provide a hose assembly fitting having a strong fixing force. It is the one we are trying to provide.

(Means for Solving the Problems) In order to achieve the above object, the present invention has the following configuration.

That is, in a joint fitting for a hose assembly, which comprises a nipple, a sleeve formed concentrically with the nipple, and a metal pipe, the nipple and the sleeve are a flange-like joint provided at the end of the nipple and the inner surface of the sleeve bottom. Are fixed by projection welding or friction welding, the metal pipe is fitted into the bottom of the sleeve, and the fitting surface is connected by brazing.

(Example) Below, this invention is demonstrated in detail based on an Example.

The fitting shown in FIG. 1 has a nipple 21 and a sleeve 23.
And a metal pipe 25.

On the outer peripheral surface of the nipple 21, a plurality of chevron projections 27 are formed in the circumferential direction to enhance the sealing property and the pulling resistance.
Further, a flange-shaped joint portion 31 is formed at the end portion on the insertion side into the sleeve 23.

On the other hand, a bottom portion 35 having a through hole 33 is formed in the sleeve 23, and the tip end portion of the bottom portion 35 serves as a pipe insertion port 37 by expanding the diameter of the through hole 33. As shown in FIG. 2, a low projection 39 for projection welding or friction welding is provided on the abutting surface side of the nipple 21 of the bottom portion 35. The projection 39 may be continuous in a circular shape or may be provided in a dotted line.

The nipple 21, the sleeve 23, and the metal pipe having the above structure
To assemble and secure 25, first set the bottom of sleeve 23.
The flange-shaped joint portion 31 of the nipple 21 is abutted against the 35 and fixed by projection welding or friction welding. For projection welding, the bottom 35 and the flange joint
It is only necessary to butt 31 against each other, apply an electric current, and apply force when the temperature reaches the welding temperature to crush the protrusions and perform welding. According to this welding method, heat and pressure are well concentrated and a large joint strength can be obtained.

Also, to perform friction welding, the bottom portion 35 and the flange-shaped joint 31
It is only necessary to press and to rotate either one to stop the rotation when the frictional heat reaches an appropriate temperature, and at the same time, to join by a strong pressing force. According to this welding method, the strength of the joint is high, the reliability is high, and dissimilar metals or difficult-to-weld metals can be joined.

Next, insert a metal pipe into the pipe insertion hole 37 of the sleeve bottom 35.
25 may be fitted and both fitting surfaces may be brazed 41.

In the above-mentioned embodiment, the diameter of the metal pipe 25 can be dealt with by changing the size of the pipe insertion port 37, and the shape of the nipple 21 can be specified as one type.

FIG. 3 shows a second embodiment, in which the pipe insertion port is formed at the tip of the bottom of the sleeve in the above embodiment, whereas a metal pipe is directly fitted into the through hole of the bottom in this embodiment. ing.

That is, the bottom portion 35a of the sleeve 23a has a through hole 33a for fitting a pipe.
And a low projection 39a for projection welding or friction welding is provided on the abutting surface side of the nipple 21.

Since the other configurations are the same as those in the above embodiment,
The same configurations are denoted by the same reference numerals, and the description thereof will be omitted for simplification.

In the assembly in this embodiment as well, similarly to the above-described embodiment, first, the flange-shaped joint 3 between the sleeve bottom portion 35a and the nipple 21 is formed.
1 and 1 are butted and fixed by projection welding or friction welding, then the metal pipe 25 is fitted into the through hole 33a, and the fitting surface may be brazed.

In the case of this embodiment, the size of the through hole 33a of the bottom portion 35a can be changed to correspond to the diameter size of the metal pipe 25 to be fitted, and it is not necessary to change the shape of the nipple 21. The chevron protrusion 27 can be changed to another shape or omitted.

Further, the protrusions 39, 39a may be formed on the flange-shaped joint 31 side.

(Effect of Device) According to this device, the following excellent effects can be obtained.

(1) Since the nipple and the sleeve are firmly fixed by projection welding or friction welding, and the metal pipe is brazed to the sleeve instead of the nipple, it is not necessary to change the shape of the nipple by changing the diameter of the metal pipe. . Therefore, only one type of nipple is sufficient, and standardization enables mass production.

(2) The length of the nipple can be made shorter than before, and the material cost and the processing cost can be reduced accordingly, and the forging process can take advantage of the mass production from the conventional cutting process. ) Since the nipple and the sleeve are fixed by projection welding or friction welding, a high sealing property is obtained and concentricity is improved.

[Brief description of drawings]

1 and 2 show a first embodiment according to the present invention,
1 is a partial sectional front view, FIG. 2 is a partial sectional front view before fixing the nipple and the sleeve, and FIG. 3 is a partial sectional front view before assembly in the second embodiment, FIGS. 4 and 5. The figure is a partially sectional front view showing a conventional example. 21 is a nipple, 23 and 23a are sleeves, 25 is a metal pipe, 3
1 is a flange-like joint, 33 and 33a are through holes, 35 and 35a are sleeve bottoms, 39 and 39a are welding projections,

Claims (1)

[Scope of utility model registration request] 1. A joint fitting for a hose assembly, comprising a nipple, a sleeve formed concentrically with the nipple, and a metal pipe, wherein the nipple and the sleeve are flange-like joints provided at the ends of the nipple. A joint fitting for a hose assembly, wherein the inner surface of the sleeve bottom is fixed by projection welding or friction welding, the metal pipe is fitted into the bottom of the sleeve, and the fitting surface is connected by brazing.