JPH0637257Y2 - 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 specifically, a fitting for a rubber hose assembly for various hydraulics and a resin hose assembly for various hydraulics, such as a power steering hose and a hydraulic. Hose for active suspension,
It can be used as a hose assembly for automobiles such as an oil brake hose, an oil hose, and a fuel hose, and a fitting metal fitting for various industrial high pressure hoses and ultra high pressure hose assemblies.

(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 separately formed for cost reduction.

FIG. 5 to FIG. 7 show a conventional joint fitting for a hose assembly, and are front views for explanation with an upper half sectioned.

FIG. 5 shows a nipple 10 to be inserted into a hose and the nipple.
10 includes a sleeve 11 formed concentrically with the nipple 10 and a metal pipe 13 connected to the nipple 10. The nipple 10 is formed by cutting a round bar to prevent a plurality of chevron projections 15 on the outer peripheral surface from coming off. And the brazing protrusions 17 are formed in the circumferential direction, and the brazing protrusions 17 are formed on the bottom portion 19 of the sleeve 11.
It is fitted in a through hole 21 drilled in the and is integrally fixed by brazing 23 in the furnace. In addition, the rear end 25 of the nipple 10
Are inserted in the metal pipe 13 and similarly connected by brazing 27 in the furnace.

In the example shown in FIG. 6A, the bottom portion 19a of the sleeve 11a is fitted and fixed in the fitting groove 31 formed on the outer peripheral surface of the nipple 10a. That is, the fitting groove 31 is an insertion port for the metal pipe 13a provided on the side where the nipple 10a is connected to the metal pipe 13a.
The inner peripheral portion 39 of the bottom portion 19a is fitted into the fitting groove 31 by crimping the shoulder portion 37 of the bottom portion 19a of the sleeve 11a in the radial direction. Furthermore, the metal pipe 13a is inserted into the insertion opening 33 of the nipple 10a,
They are connected by brazing 41.

In addition, the example shown in FIG. 7 shows a nipple 10b and a metal pipe 13b.
Are integral with each other, and the sleeve 11b is fixed by annular bulging portions 43 and 45 formed by pressing the nipple 10b in the axial direction. That is, the sleeve 11b is placed at an appropriate position on the nipple 10b.
The through hole 21b of the bottom portion 19b is press-fitted and externally inserted, and then the punch member presses the end portion of the nipple 10b in the axial direction to annularly bulge portions 43 on both inner and outer sides of the bottom portion 19b of the nipple 11b.
45 is formed, and the sleeve 11 is formed by the annular bulges 43 and 45.
It is a fixed b.

To connect with the hose, in any of the above configurations, the hose is inserted into the gap 29 between the nipples 10, 10a, 10b and the sleeves 11, 11a, 11b, and the sleeves 11, 11a, 11b are respectively added in the radial direction. Tighten and fix the hose.

Both the nipple and the sleeve in the joint fitting for hose assembly described above must be firmly fixed without coming off due to vibration or swing during use.

(Problems to be Solved by the Invention) However, the conventional fixing structure for the nipple and the sleeve in the joint fitting for a hose assembly has the following problems.

That is, as shown in FIG. 5, when the nipple 10 and the sleeve 11 are fixed to each other by brazing, it is necessary to increase the width of the fitting convex portion 17 in order to surely prevent brazing and runout. is there. For this reason, there is a problem that the cost of the nipple and the sleeve increases.

Further, as shown in FIG. 6, when the shoulder portion 37 of the bottom portion 19a is swaged to be fixed to the nipple 10a, the bottom portion 19a needs a certain thickness as in the example of FIG. Becomes a problem. When the thickness of the bottom portion 19a is reduced, as shown in FIG. 6 (B), the shoulder portion 37 of the bottom portion 19a is deformed during caulking to form a protruding portion 37a on the inside, and the hose 7 is placed in the space 29. When inserted, the tip of the hose 7 hits the protruding portion 37a and a gap 38 is formed between the bottom portion 19a and the end surface of the hose, so that the hose cannot be inserted sufficiently. Therefore, there is a problem that the hose is insufficiently inserted. Further, there is a problem that productivity is poor because the crimping machine has to crimp one by one.

Further, in the case of the structure shown in FIG. 7, although the cost can be reduced, it is possible only in the case where the nipple and the metal pipe are integrally structured, and if the wall thickness of the pipe is not thick, the sleeve is not formed. There is a problem that the nipple is crushed when it is crimped.

The present invention has been made in view of the present circumstances, and an object thereof is to provide a joint metal fitting for a hose assembly, which has a simple structure to reduce the cost and has a strong fixing force.

(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, comprising a nipple and a sleeve formed concentrically with the nipple, inserting a hose between the nipple, and caulking the sleeve to fix the hose assembly. The bottom portion of the sleeve is sandwiched between the projection or step provided on the base plate and the tip end surface of the metal pipe into which the end portion of the nipple is inserted, and the metal pipe and the nipple are connected by brazing.

(Operation) The protrusion or step on the outer peripheral surface of the nipple and the metal pipe prevent the sleeve from being displaced in the axial direction, and the metal pipe and the nipple are connected by brazing, so that the sleeve is securely fixed.

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

1 to 4 are partially enlarged sectional views of a joint fitting according to the present invention.

The fitting 50 shown in FIG. 1 includes a nipple 51 and a sleeve 53.
And a metal pipe 55. On the outer peripheral surface of the nipple 51, a plurality of chevron-shaped projections 57 are provided to improve the sealing property and the pulling resistance.
Is formed in the circumferential direction, and further, on the insertion portion 59 side to the metal pipe 55, a sleeve locking projection 61 is also continuous in the circumferential direction with the chevron projection 57 or at a constant interval. Is formed in. Then, by inserting the insertion portion 59 into the through hole 56 provided in the bottom portion 54 of the sleeve 53, the bottom portion 54
Abut on the sleeve locking protrusion 61, and further,
Insert 59 into the metal pipe 55 and place the end of the metal pipe 55 at the bottom.
Abut on 54 and braze the joint surface of the insertion part 59 and the metal pipe 55.
By doing 63, the nipple 51 and the sleeve 53 are fixed.

As shown in FIG. 2, the sleeve locking projection 61 is formed by an inclined surface 61a inclined upward to the left in the drawing and a ring-shaped frustum surface 61b, and has a height X of 0.5.
~ 1.5mm, width Y 0.5 ~ 2.5mm, preferably height X
0.7 to 0.9 mm and width Y is 1 to 1.5 mm. When the sleeve locking projection 61 abuts the bottom portion 54 of the sleeve 53,
It becomes almost vertical.

Next, the nipple 51, the sleeve 53, and the metal pipe
To assemble 55, the insertion portion 59 of the nipple 51 is first inserted into the through hole 56 of the bottom portion 54 of the sleeve 53 and the bottom portion 54 is brought into contact with the sleeve locking projection 61. At this time, the nipple 51 and the sleeve 53 are temporarily fixed or fixed by projection welding to prevent runout. Next, the insertion portion 59 may be inserted into the metal pipe 55, the tip end surface of the metal pipe 55 may abut against the bottom portion 54, and then the joint surface between the insertion portion 59 and the metal pipe 55 may be brazed 63.

FIG. 3 shows the sleeve locking projection 61 in the first embodiment.
A second embodiment is shown in which a step portion 64 is used instead of the above. That is, a plurality of chevron protrusions 57 are formed on the outer peripheral surface of the nipple 51a in the circumferential direction, and the insertion portion 59a is thin and has a step 64 between the chevron protrusion 57 and the insertion portion 59a. , The side surface 6 of the step 64
The bottom portion 54 of the sleeve 53 is in contact with the sleeve 5.

Assembly in this embodiment may be performed in the same manner as in the first embodiment.

FIG. 4 further shows a third embodiment in which a fitting projection 67 is formed between the mountain-shaped projection 57 of the nipple 51b and the insertion portion 59b in place of the sleeve locking projection 61. In the case of this embodiment, the fitting projection 67 is formed on the through hole surface of the bottom portion 54b.
Forming a notch 69 in which is fitted, the inner peripheral portion 71 is sandwiched by the fitting projection 67 and the metal pipe 55b, and the joint surface between the insertion portion 59b and the metal pipe 55b is fixed by brazing 63b. .

It should be noted that the ridge-shaped projection 57 of the nipple in the above-described embodiment can be omitted and can be changed to another known shape such as a ring-shaped groove. Further, in the third embodiment, the sleeve 53b
Although the notch 69 is formed in order to prevent the fitting protrusion 67 from protruding from the inner surface of the bottom portion 54b, the notch 69 can be omitted if the width of the fitting protrusion 67 is small.

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

(1) Assembling the respective parts is easy, and since the bottom portion of the sleeve is firmly fixed, there is no danger of coming off the nipple and it can be used safely.

(2) The smaller the outer diameter is, the more preferable it is to reduce the cutting amount of the nipple. However, in the present invention, since only the protrusion or the step portion for locking the bottom portion of the nipple is formed, it is possible to reduce the diameter of the material. it can.

(3) Since the sleeve and the nipple are not deformed when the sleeve and the nipple are fixed, the bottom portion of the sleeve can be made thin. Therefore, the sleeve can be formed by plate drawing or pipe drawing, and the cost of the sleeve can be reduced.

(4) Since the structure of each part is simple, it is possible to establish not only the material cost but also the processing cost and the mass production.

[Brief description of drawings]

1 to 4 show an embodiment according to the present invention, FIG. 1 is a partially sectional front view of the first embodiment, FIG. 2 is an enlarged explanatory view of an essential part, and FIG. 3 is a second embodiment. FIG. 4 is a partial cross-sectional front view of the third embodiment, and FIGS. 5 to 7 are a partial cross-sectional front view and a main part enlarged cross-sectional view showing a conventional example. 51, 51a, 51b are nipples, 53, 53b are sleeves, 54, 54b
Is the bottom of the sleeve, 55, 55b are metal pipes, 59, 59a, 59
b is an insertion portion, 61 is a sleeve locking protrusion, 63 and 63b are brazed, 64 is a sleeve locking step,

Claims (1)

[Scope of utility model registration request] 1. A joint fitting for a hose assembly comprising a nipple and a sleeve formed concentrically with the nipple, wherein a hose is inserted between the nipple and the sleeve is caulked and fixed. A fitting for a hose assembly, characterized in that the bottom of the sleeve is held by a protrusion or step provided on the outer peripheral surface of the nipple and a metal pipe into which the end of the nipple is inserted, and the metal pipe and the nipple are connected by brazing. .