KR19980041682A - Hose couplings, intermediate molded parts for manufacturing them and hose assemblies using them - Google Patents

Abstract

The hose coupling 100 has an inner tube, ie a tubular nipple portion 101, an outer tube, ie a tubular sleeve portion 102 and a head portion 103. The nipple portion 101, the sleeve portion 102 and the head portion 103 are necessarily molded from one molding material. The head portion 103 is provided with a hole 109 at an end opposite to the end where the nipple portion 101 and the sleeve portion 102 are coupled. In addition, a female thread 105 and a conical seal 108 are provided inside the head 103. At least the nipple portion 101 is molded by plastic deformation. More preferably, other portions including the sleeve portion 102 and the head portion 103 are also molded by plastic deformation from the intermediate molded article.

Description

Hose couplings, intermediate molded parts for manufacturing them and hose assemblies using them

TECHNICAL FIELD The present invention relates to a hose coupling, an intermediate molded article for manufacturing the same, and a hose assembly using the same, and more particularly, to a hose coupling suitable for an industrial hose such as a brake hose, an intermediate molded article for manufacturing the same, and a hose assembly using the same. .

Hose couplings or hose mouthpieces, such as those used in automatic hydraulic brake lines, have been used in consideration of their detachable, reliable and leaky features.

Conventional hose couplings have a tubular nipple portion having an axial bore, a tubular sleeve portion extending axially with respect to the nipple portion, and a shaft therethrough. The head part is provided in the end to which the nipple part and the sleeve part which are provided with the hole of a direction are connected.

Generally, the head portion provides internally a female thread with a hose coupling connected to the nozzle member.

These types of hose couplings or hose mouthpieces are characterized by (a) cutting each part of the hose coupling from one molding material, and (b) separately generating a body portion comprising a nipple portion, a sleeve portion and a head portion, It is prepared according to a variety of methods such as fixing the separation parts together by (c) by caulking the body portion including the head portion and the separation sleeve portion together (caulking).

However, according to the first method, there is a disadvantage that it is not suitable for mass production because a large amount of chips are produced by cutting and manufactured at a high cost by its relatively slow operation speed.

In addition, it causes a lack of stability of the finished dimension.

The second method of soldering has the advantage of mass production.

1 shows an example of a conventional hose coupling produced by this method.

The hose coupling 10 has an inner tube 11 and an outer tube 12 separately.

The outer tube 12 is an arm provided inside the side wall of the head portion 13, a sleeve portion 14 extending from one end of the head portion 13, and a hole 22 created at another end of the head portion 13. A thread 15, an annular groove 16 and a flange 17 around it.

The inner tube 11 has a conical seal portion 18, a nipple portion 19 and a flange portion 23, through which an axial hole 20 is provided, as shown in FIG. 2A. do.

The inner tube 11 is formed by plastic deformation using a mold, but the outer tube 12 is usually produced from a circular rod or pipe by cutting.

The inner tube 11 is inserted into the inner hole 24 (see FIG. 2B) of the outer tube 12 in which the flange portion 23 is fitted into the inner hole 24, and is externally made by soldering using copper solder or the like. It is fixed to the tube (12).

The sleeve portion 14 and the nipple portion 19 create a cylindrical receiving pocket 21 in which one end of the hose member is inserted and fixed by crimping.

3 shows a similar conventional hose coupling with the same reference numerals in the same parts as used in FIG. 1.

In this case, the stepped annular groove 36 is provided around the head portion 13.

Since soldering is performed at a temperature higher than the melting point of the solder, for example, soldering at a temperature of 1,100 to 1,150 ° C is performed for copper solder.

However, according to the second method, there are the following disadvantages.

(1) Cutting is necessary to form the nipple portion 11. It produces useless chips and yields very poor.

(2) The nipple portion 19 has a very small diameter and takes too long to create an axial hole 20. The hole may have a slope due to deterioration of the crimping state.

(3) At least the inner tube 11 and the outer tube 12 are to be produced separately. The flange portion 23 and the inner hole must be made to the correct dimensions to fit tightly and solder together. It requires more manufacturing steps and quality control and is not cost effective.

(4) The heat of soldering heat-treats the nipple part 19 to make it softer. As a result, the nipple portion 19 is likely to break when the sleeve portion 14 is crimped together with the hose member.

(5) Fluid leakage may occur due to insufficient sealing or inadequate soldering of the connection, such as skipping of the manufacturing step and detachment of the solder.

(6) The nipple portion 10 is fitted off the center of the inner hole 24 due to the difficulty of inserting one end of the hose member.

According to the third method, by fixing the body portion and the slitting portion together by caulking, it has been considered to have the advantages of less manufacturing steps, less likely to break the nipple, and inexpensive.

However, there is a disadvantage in that the leakage of fluid from the connecting portion is easier than in the soldering method, and it does not appear to be practically applicable.

On the other hand, in addition to the conventional hose coupling having a female thread shown in Figs. 1 and 3, other types of hose couplings are known.

4 shows a conventional hose coupling having a female thread 40 having an inner tube 41 and an outer tube 42 separately as nipples.

The outer tube 42 includes a head portion 43, a sleeve portion 44 extending from one end of the head portion 43, a male screw 45 provided outside the periphery of the head portion 43, and a flange portion around the portion 43. And (47).

One end of the inner tube or nipple portion 41 is inserted into the hole 46 through which the hole 20 in the axial direction is provided.

FIG. 5 shows a conventional hose coupling having an eye ring 50 having an inner tube or nipple portion 59, a sleeve portion 54 and a head portion 53.

The head portion 53 has an eye ring 53a for providing an eye opening 53b and a neck portion 53c for connecting the eye ring 53a to the sleeve 54. Include.

One end of the nipple portion 59 is inserted into and connected to the hollow portion of the neck portion 53c.

FIG. 6 shows a conventional hose having a nipple portion 69, a sled portion 64 and a flat head portion 63 having a rectangular cross section.

The flat head portion 63 provides an opening 67 and a male thread 65 at one end of the axial hole 66 bent in an L shape inside the flat head portion 63.

The nipple portion 69 and the sleeve portion 64 are coaxially attached to the surface on which the opening of the other end of the hole 66 is located.

Regardless of the deformation of these head portions, the sleeve and nipple portions should have different hardness.

If the sleeve portion is harder than any hardness, it cracks by the crimping process.

On the contrary, if the nipple portion is not harder than any hardness, it is broken by the crimping process due to the possibility of sealing deterioration or the deviation of the inner diameter of the hose member.

According to a conventional hose coupling, the inner tube or nipple portion is made of a relatively rigid material such as chromium-molybdenum steel, while the outer tube or sleeve portion 91 is made of steel.

Therefore, the mechanical force of the female or male thread is insufficient to ensure the leakage prevention of the connection between the hose coupling and the nozzle member.

Since the female or male thread is formed inside or outside the head portion made of the same material as the outer tube or sleeve portion by similar machining, the female or male thread does not damage the sealing portion of the hose coupling or provide sufficient stress. Can't give

After all, it is an object of the present invention to provide a hose coupling, which is inexpensive and suitable for mass production, an intermediate molded part for producing it and a hose assembly using the same.

Another object of the present invention is to provide a hose coupling and a hose assembly using the same that can improve the reliability.

It is a further object of the present invention to provide a method of making a hose coupling, in which the manufacturing process is simple and the machining process is reduced as much as possible.

It is a further object of the present invention to provide a hose coupling which prevents the inner tube or nipple portion from being broken by the crimping process.

According to a first aspect of the invention, a hose coupling includes a tubular nipple having an axial bore, a tubular sleeve extending axially with respect to the nipple, and a nipple through which an axial bore is provided. A head portion is provided at one end to which one end of the portion and the sleeve portion are connected, wherein the nipple portion, the sleeve portion, and the head portion are molded from one molding material, and at least the nipple portion is formed by plastic deformation.

According to a third aspect of the present invention, a coaxial double tubular structure includes an inner tube portion having an axial hole, an outer tube portion extending axially with respect to the inner tube portion, and an axial hole therethrough. At one end to which the provided nipple portion and the sleeve portion are coupled, a base portion is provided, and the inner tube portion, outer tube portion, and base portion are formed of one molding material, and the inner tube portion is harder than the outer tube portion. .

According to a fourth aspect of the invention, a brake hose coupling assembly comprises a hose member and a hose coupling coupled to at least one end of the hose member, the hose coupling having a tube having an axial hole. A tube-like sleeve portion extending in the axial direction with respect to the nipple portion so that the upper nipple portion and at least one end of the hose member inserted into the pocket between the nipple portion and the sleeve portion is fixed, and an axial hole therethrough. A head portion is provided at one end to which the provided nipple portion and one end of the sleeve portion are coupled, wherein the sleeve portion and the head portion are formed of one molding material, and the nipple portion is harder than the sleeve portion.

According to a fifth aspect of the present invention, there is provided a plastic deformation from a molding material including a projection of a cylinder, a tubular sleeve extending in the axial direction with respect to the projection, and one end of which the projection and one end of the sleeve are joined. A method of manufacturing a hose coupling by means of which the protrusion, the sleeve and the head are molded from one molding material, the method comprising plastically deforming the protrusion forming the tubular nipple.

1 is a cross-sectional view showing a conventional hose coupling,

2A and 2B are cross-sectional views illustrating inner and outer tubes respectively used in the conventional hose coupling shown in FIG. 1;

3, 4, 5 and 6 are cross-sectional views similar to those of FIG. 1 showing yet another form of a conventional hose coupling,

7 is a cross-sectional view showing the hose coupling of the first preferred embodiment according to the present invention;

8A, 8B, 8C and 8D are cross-sectional views illustrating a method of manufacturing the hose coupling shown in FIG. 7 using an intermediate molded article in the first preferred embodiment;

9 is a sectional view showing a hose coupling of a second preferred embodiment according to the present invention;

10a and 10b are cross-sectional views showing the hose coupling of the third preferred embodiment according to the present invention;

11 is a cross-sectional view similar to FIG. 7 showing a hose coupling of a fourth preferred embodiment according to the present invention;

12 is a cross-sectional view similar to FIG. 7 showing a hose coupling of a fifth preferred embodiment according to the present invention;

FIG. 13 is a sectional view similar to FIG. 7 showing a hose coupling of a sixth preferred embodiment according to the invention;

14 is a cross-sectional view similar to FIG. 7 showing a hose coupling of a seventh preferred embodiment according to the present invention;

15 to 30 are cross-sectional views similar to FIG. 8A showing the intermediate molded articles of the second to seventeenth preferred embodiments according to the present invention;

Figure 31 is a sectional view of the hose assembly according to one preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100 hose coupling 101 nipple part

102 sleeve portion 103 head portion

105: female thread 108: conical seal

109: hole

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

The hose coupling or hose mouthpiece of the first preferred embodiment is shown in FIG. 7.

The hose coupling 100 is an inner tube, ie a tubular nipple portion 101, an outer tube extending coaxially with respect to the nipple portion 101, ie, a tubular sleeve portion 102 and a head portion 102. It is provided.

One end of the nipple portion 101 and the sleeve portion 102 are coupled to one end of the head portion 103 extending from the nipple portion 101 through the head portion 103 in the axial hole 110.

In this invention, the said nipple part 101, the sleeve part 102, and the head part 103 are necessarily formed from one molding material.

The head portion 103 provides a hole 109 at one end opposite the end where the nipple portion 101 and the sleeve portion 102 are coupled.

Moreover, the head portion 103 provides therein the female thread 105 and the conical closure 108 at the bottom thereof along the periphery of the hole 109.

The nipple portion 101 is as long as the sleeve portion 102 ', ie as long as L1, has an axial hole 110, and the outer and inner diameters of the nipple portion 101 are d1 and d2, respectively.

For example, L1 = 18 mm, d1 = 3.5 mm and d2 = 2.3.

The sleeve portion 102 suitably accommodates one end (not shown) of the hose member inside the receiving pocket 111 formed by the nipple portion 101, the inner wall of the sleeve portion 102, and the circumference of the central wall portion 104. Has an inner diameter.

The head portion 103 provides an annular groove 106 and an annular flange portion 107 around it.

In the first preferred embodiment, the nipple portion 101, the sleeve portion 102 and the head portion 103 are not only formed of one molding material, but at least the nipple portion 101 is formed by plastic deformation. Formed.

In particular, as can be seen by the following manufacturing process for manufacturing the hose coupling of the first preferred embodiment, the other parts including the sleeve portion 102 and the head portion 103 are also formed by plastic deformation. have.

(a) molding of intermediate molded articles

As a first step, an intermediate molded article 300 is formed as shown in Fig. 8A.

The intermediate molded article 300 has a cylindrical protrusion 301 to be formed later as a tubular nipple portion by plastic deformation, and a tubular sleeve portion 302 and a protrusion 301 extending in an axial direction with respect to the protrusion 301. The base portion 303 is provided at an end portion to which one end of the portion 302 is coupled.

The protruding portion 301, the sleeve portion 302 and the head portion 309 are formed of one intermediate molded product.

The base portion 303 preferably provides a preliminary hole 309 at the opposite end of the head portion 303 on which female threads are formed later.

The protrusions 301 are shorter than their axial length sleeves 302, and preferably their size and outer diameter are substantially the same as those of the nipple portion 101 to be formed later by plastic deformation.

For example, the diameter d3, the length L2 of the protrusion 301 and the length of the sleeve 302 are 3.5 mm, 10 mm and 18 mm, respectively.

If the intermediate molded part 300 is formed by cold forging, then cold cast carbon steel wire (SWCH12 or SWCH15) or its equivalent, which is generally heat treated and lubricated, is preferably used as the initial material. do.

Although plastic deformation may be performed like the mold of a conventional multi-stage parts, the intermediate molded product may be produced only by machining, or by a combination of plastic deformation and machining.

(b) heat treatment of intermediate molded products

As a second step, the intermediate molded article 300 is preferably heat-treated under a predetermined state in which the protrusion 301 is relatively soft so that it can be easily deformed by plastic deformation in the following steps.

Since the intermediate molded product 300 is heated at 880 ° C. to 900 ° C. for about 2 hours, and then heat treated under a gradually cooled state in a heating furnace for 7 hours or more, its Rockwell (B) hardness is 60 or less. .

In addition to the heat treatment, a lubrication process may be performed.

(c) Formation of the nipple part by plastic deformation

Next, the protrusion 301 is deformed to form the nipple portion 101 by plastic deformation as shown in FIG. 8B.

In this step, the holder 81 to be inserted into the holder 81, the cylindrical punch 82 having a very large hardness supported in the holding hole 83 of the holder 81, and the sleeve portion 302 of the intermediate molded product A nipple molding machine 80 having a tubular punch guide 84 extending from one end of the die to the punch 82 is used.

The punch 82 has an outer diameter equal to the diameter d2 of the hole in the axial direction of the nipple portion 101.

On the other hand, the tubular punch guide 84 has the diameter of the hole 84a which is the same as the outer diameter d3 of the protrusion 301.

To make plastic deformation, the nipple forming machine 80 is coaxially positioned with a metal die (not shown), and then the holder 81 and the punch 82 are moved forward by a hydraulic press.

When the deformation force of the protrusion 301 is 20 Ton / cm ² , the punch 82 is pressed against the tip surface 301a of the protrusion 301 with a force of about 1 Ton.

The punch 82 forms an axial hole in the projection 301 and at the same time into the guide hole 84a (as indicated by dashed lines l ₁ , l ₂ in FIG. 8B), ie, the nipple portion 101. The projection 301 is pushed back into the space between the outer wall of the punch 82 and the inner wall of the punch guide 84 so as to obtain.

That is, the nipple portion 101 is molded by plastic deformation by performing back extrusion toward the holder 81 serving as a reservoir.

The press is performed by multiple stages of pressing.

However, the tip surface 301a is preferably at right angles to the axis of the protrusion 301 to prevent destruction by its incline with the punch 84.

(d) punching, sealing and flange forming

With the formation of the nipple portion 101, the central wall portion is punched through the lower surface side of the preliminary hole 309.

In addition to using the nipple forming machine 80, in punching using another hydraulic press machine, the punch 82 can move back and forward relative to the holder punching the central wall 104.

At the same time, preferably, the conical closure 108 can be formed.

For example, the seal may be formed by plastic deformation while forming a die (not shown) in any form.

In addition, the flange portion 107 may be formed around the base portion 303 by die casting or punching.

Thereafter, the hose coupling before the machining operation is obtained as shown in FIG. 8C.

(e) machining

Next, the female thread 105 and the annular groove are formed by using an NCI machine tool, an automatic lathe, or the like.

As shown in FIG. 8D, a female thread having a length L4 (eg, about 10 mm) and an inner diameter d4 (eg, about 9 mm) is formed by using a tap (not shown).

In addition, the conical seal is finished such that it has a conical angle θ (ie 84 degrees) and its base has a diameter d5 (eg 7.5 mm) which is certainly larger than the diameter of the hole 110 in the axial direction.

The seal may be formed by machining.

Finally, the hose coupling 100 shown in FIG. 7 is obtained.

According to the above manufacturing method of the hose coupling, by the most suitable combination of the cold casting process of the head portion 103 and the sleeve portion 102 and the nipple 101, the hose coupling is stable through fewer processing steps It can be prepared as.

Therefore, the method is suitable for mass production.

However, since the cutting process is limited to a small portion of all manufacturing processes, such as the molding of the female thread 105, the generation of chips can be minimized.

However, according to the method described above, the hose coupling 100 has an important feature that the nipple portion 101 is harder than the sleeve portion 102 by protruding backward through plastic deformation (eg, the nipple portion is Has a hardness of 90-95 Rockwell B scale), and is not broken by the crimping operation of the hose member (not shown).

On the other hand, since the sleeve portion 102 becomes softer by heat treatment prior to nipple formation (eg, the sleeve portion has a hardness of 55-60 Rockwell B scale), one end of the hose member (not shown) is connected to the hose coupling 100. It will attach easily to

Because of the structure of the hose coupling made of one intermediate molded part without soldering or caulking, its leakage protection can be further improved.

Therefore, it is suitable for high pressure hydraulic lines.

According to the rear projection of the nipple part in the above-mentioned method, although the ratio of the punch diameter d2 and the growth length L1 is about 8 which is larger than the normal ratio (5 to 6), it is a high accuracy hydraulic press, high accuracy It will be understood by those skilled in the art of protruding backward by applying a die having a die and a very large hardness and the like.

However, the method can be applied to a method for producing a coaxial double tubular structure having a similar structure, generally including an inner tube portion and an outer tube portion.

The intermediate molded article from which the hose couplings are formed may comprise copper, aluminum and alloys of such materials.

9 shows a hose coupling of a second preferred embodiment according to the invention, wherein the same reference numerals as used in FIG. 7 denote the same parts.

In the second preferred embodiment, the conical closure 128 projects through the short cylindrical portion 128a toward the opening of the hole 109, such that the tip surface of the conical closure 128 is Cross the distal end.

Figure 10a shows a hose coupling of a third preferred embodiment according to the invention, wherein the same reference numerals as used in Figures 7 and 8 denote the same parts.

In the hose coupling 140, the hardness of the nipple portion 141, the sleeve portion 142, and the head portion 143 near the female thread 105 is different from each other.

As shown in Fig. 10B, the nipple portions 141 at points 141a, 141b and 141c have a hardness of at least 160 Hv Vickers scale, preferably 160 Hv to 240 Hv, more preferably 170 Hv to 190 Hv.

The sleeve portion at points 142a, 142b and 142c has a hardness of 150 Hv Vickers scale or less, more preferably 90 Hv to 150 Hv.

The head portion 143 near the female thread 105 has a hardness of 120 Hv to 180 Hv Vickers scale, more preferably 150 Hv to 170 Hv.

As a result, the nipple portion 141 is harder than the sleeve portion 142 and the head portion 143, and the head portion 143 near the thread portion 105 is harder than the sleeve portion 142.

Preferably, the conical closure 108 has the same hardness as the head 143 in the vicinity of the female thread 105 143a, 143b, which is substantially 150 Hv to 170 Hv Vickers scale.

The hose coupling of the third preferred embodiment can be produced through a manufacturing process such as to manufacture the hose coupling of the first preferred embodiment described above.

(a) molding of intermediate molded articles

As a first step, an intermediate molded article as shown in FIG. 8A is formed by the same procedure as in the first preferred embodiment.

(b) heat treatment of intermediate molded products

As a second step, the intermediate molded article is necessarily heat treated under a predetermined state, whereby the protrusion is relatively softened so that the protrusion can be easily deformed by plastic deformation in a subsequent step, and the hardness of the sleeve portion 142 is, for example, 90 to 150. It will be as hard as the Hv Vickers scale.

(c) Molding of the nipple part by plastic deformation

Next, the protrusion is deformed to form the nipple portion 141 by plastic deformation as shown in Fig. 8B.

In this step, the nipple portion 141 is formed by plastic deformation by protruding backward, through which the nipple portion 141 will be as hard as, for example, 160 to 240 Hv Vickers scale.

(d) Punching, forming seals and flanges

The nipple portion is formed by punching through the central wall portion 104, and preferably at the same time, the conical closure 108 is formed by plastic deformation.

Because of the work hardening at the time of molding, the closed portion 108 has a hardness of 150 to 170 Hv Vickers scale.

For example, the nipple portion may be formed by plastic deformation while forming a die (not shown) in any shape.

In addition, the flange 107 is formed by plastic deformation at the same time or through additional steps.

On the other hand, the female thread mountain 105 is formed by plastic deformation by using a tab.

Since it is formed after the heat treatment step, the head portion 143 near the female screw thread 105 is cured to be as hard as the 120 to 180 Hv Vickers scale.

(e) machining

Finally, the annular groove 106 is formed by using NCI machine tools, automatic lathes and the like.

According to the hose coupling of the third preferred embodiment, the nipple portion 141 and the sleeve portion are molded from one intermediate molded article, and since the nipple portion is harder than the sleeve portion, leakage prevention is improved and the nipple portion 141 ) Is not easily broken by crimping the hose member.

Therefore, it is suitable for high pressure hydraulic lines.

However, since the head portion 143 near the female thread is harder than the sleeve portion 142, the screw is not easily broken and the coupling strength is improved.

The hose coupling with female thread is shown in the third preferred embodiment, but the present invention is directed to a hose coupling having different shapes of head portions, as shown in FIGS. 11, 12, 13 and 14. It can be applied to another form.

11 shows a hose coupling of a fourth preferred embodiment according to the invention.

The hose coupling 160 has a male thread 165 around the head portion 163, and an axial hole 170 is provided through the nipple portion 161 and the head portion 163.

The nipple portion 161, the sleeve portion 162 and the head portion 163 are manufactured from one intermediate molded article, and the head portion 163 near the nipple portion 161, the sleeve portion 162 and the male thread 165. Hardness is precisely determined according to the invention.

In this embodiment, the male thread acid may be formed by plastic deformation.

12 shows a hose coupling of a fifth preferred embodiment according to the invention.

The hose coupling 180 includes a nipple portion 181, a sleeve portion 182, and a head portion 183 formed from one molding material.

The head portion 183 includes an eye ring 183a that provides a pinhole 183b and a neck portion 183c that couples the sleeve portion 182 and the eye ring 183a.

The axial hole 190 extends through the nipple portion 181 and the neck portion 183c.

In this embodiment, the sleeve portion 182, nipple portion 181 and head portion 183 have hardness of 90 to 150 Hv, 150 to 250 Hv and 90 to 250 Hv Vickers scale.

In order to produce the hose coupling of the fifth preferred embodiment, the intermediate molded part is formed of a low carbon steel intermediate molded part containing about 0.08 to 0.20% carbon, so that under certain conditions, the hardness of the sleeve portion is from 90 to 150 Hv Vickers scale. Heat treatment.

Next, the nipple part 181 is formed by plastic deformation, and its hardness becomes 150-250 Hv Vickers scale by work hardening through it.

Irrespective of the head portion 183, the hardness of the 90 to 150 Hv Vickers scale may be obtained by almost completing the shape before the heat treatment, but the hardness of the 150 to 250 Hv Vickers scale is the plastic deformation starting at the spherical portion of the intermediate molded product. It may be obtained by forming a pin hole by plastic deformation by forming a ring or punching the head portion of the intermediate molded article.

13 shows a hose coupling of a sixth preferred embodiment according to the invention which is a variant of the fifth preferred embodiment.

The hose coupling 200 includes a nipple portion 181, a sleeve portion 182, and a head portion 183 including an eye ring 183a and a neck portion 183c.

The nipple portion 182, the sleeve portion 182 and the neck portion 183c of the head portion are formed from one intermediate molded product by plastic deformation, but the eye ring 183a is formed by cutting or cold casting, and soldering By neck and the like.

Figure 14 shows a hose coupling of a seventh preferred embodiment according to the invention.

The hose coupling 200 includes a nipple portion 221 having an axial hole 230, a sleeve portion 220, and a flat head portion 223 having a rectangular cross section.

The flat head portion 223 extends through the opening 227 and the female threaded portion 225 and a conical seal at one end of the axial hole 230 which is bent in an L shape inside the flat head portion 223 ( 228).

The nipple portion 221, the sleeve portion 222 and the flat head portion 223 are formed from one intermediate molded article, and the flat head portion near the nipple portion 221, the sleeve portion 222 and the female thread 225. The hardness of 223 is different according to the present invention.

In addition to the intermediate molded articles of the above-mentioned preferred embodiments according to the present invention, various modifications of the intermediate molded articles as shown in FIG. 8 may be possible as described below.

FIG. 15 shows an intermediate molded article of the second preferred embodiment according to the present invention in which a tapered conical closure 318 is preformed at the bottom of the hole 309 provided in the head portion 303.

Figure 16 shows an intermediate molded article of a third preferred embodiment according to the invention in which the annular flange portion 327 is preformed around the head portion 303.

FIG. 17 shows a fourth according to the invention in which a predetermined depth of an assist hole 335 is provided at the bottom of the hole 309 with respect to the central wall 334 with an inner diameter corresponding to the diameter of the hole in the axial direction. The intermediate | mold molded article of the Example of the is shown.

According to this embodiment, it is easier to punch an axial hole through the central wall 334.

18 shows an intermediate molded article of the fifth preferred embodiment according to the present invention in which a predetermined depth of tip hole 342 is provided at the tip of protrusion 341.

In this case, the length of the protrusion is formed longer by the volume of the tip hole 342 than in the previous embodiment.

According to this embodiment, it is easier to push the punch into the projection for back extrusion.

FIG. 19 shows an intermediate molded article of the sixth preferred embodiment according to the present invention in which a predetermined depth of the auxiliary hole 335 as shown in FIG. 17 and a predetermined depth of the tip hole 342 as shown in FIG. 18 are provided. .

According to this embodiment, it is easier to punch the axial hole through the central wall 334 and to push the punch into the projection for back extrusion.

20 shows an intermediate molded article of the seventh preferred embodiment according to the present invention in which a tapered conical closure 368 provides an auxiliary hole 335.

Figure 21 shows an intermediate molded article of the eighth preferred embodiment according to the present invention in which a tapered conical closure 318 and a tip hole 342 at the tip of the projection 341 are provided.

Figure 22 shows an intermediate molded article of the ninth preferred embodiment according to the present invention in which a tapered conical closure 368 having an auxiliary hole 335 and a tip hole 342 at the tip of the protrusion 341 are provided.

Figure 23 shows an intermediate molded article of the tenth preferred embodiment according to the present invention in which the auxiliary hole 335 and the flange portion 397 around the head portion 303 are provided in advance.

Fig. 24 shows an intermediate molded article of the eleventh preferred embodiment according to the present invention in which the tip hole 342 and the flange portion 397 are provided in advance.

Fig. 25 shows an intermediate molded article of a twelfth preferred embodiment according to the present invention in which the auxiliary hole, the tip hole 342, and the flange portion 397 are provided in advance.

FIG. 26 shows a thirteenth preferred embodiment according to the present invention in which a female conical seal portion 425 is provided in the lower portion of the hole of the head portion 303 and a flange portion 397 is provided around it. The intermediate molded article of the example is shown.

The female closure 425 may be preferably formed by cutting for a longer life of the punch of the punch forming machine to be used later.

According to this embodiment, since the center wall portion is thin in the vicinity of the axis where punching is performed, punching thereof becomes easier.

In the present embodiment, the flange portion may be optional.

FIG. 27 shows a fourteenth preferred embodiment according to the present invention in which the female conical closure 425 is further provided with an auxiliary hole corresponding to an axial hole as deep as its bottom almost reaching the surface of the central wall 434. The intermediate molded article of the example is shown.

According to this embodiment, it is very easy to punch the central wall portion.

28 shows an intermediate molded article of the fifteenth preferred embodiment according to the present invention in which a female conical closure 425, a tip hole 342 and an annular flange 397 are provided.

Figure 29 shows an intermediate molded article of the sixteenth preferred embodiment according to the present invention in which a female conical closure 425, a tip hole 342, and an annular flange portion 397 having an auxiliary hole 435 are provided.

30 shows an intermediate molded article of the seventeenth preferred embodiment according to the present invention in which the central wall portion is thinner than in the embodiment described above in thickness t, and the projections 461 extend with respect to the end surface of the sleeve portion.

The protrusion 461 and the sleeve 462 are shorter than in the embodiment described above.

In order to manufacture the hose coupling using this embodiment, the nipple portion is formed by plastic deformation through back extrusion, and at the same time the nipple portion and the sleeve portion are tube-shaped by deformation of the thick portion t of the central wall portion 464. Extends rearward in shape.

Figure 31 shows a hose assembly of a preferred embodiment according to the present invention.

The hose coupling 100 is attached to both ends of the hose member 501 by inserting each end into a receiving pocket formed between the nipple portion 101 and the sleeve portion 102.

The sleeve portion is crimped as in 502 around the end of the hose member 501.

Although the invention has been described in terms of specific embodiments for complete and obvious disclosure, the appended claims are not limited thereto and all modifications that may occur to those skilled in the art that fall within the underlying principles described herein. And other configurations may be interpreted as being able to materialize.

No content

Claims (31)

A tube-shaped nipple portion having an axial hole, A tubular sleeve portion extending axially on the nipple portion; A hose coupling having a head portion provided at one end thereof with one end of the nipple portion and the sleeve portion provided such that the hole in the axial direction passes therethrough. And wherein the nipple portion, the sleeve portion and the head portion are molded from one molding material, and at least the nipple portion is formed by plastic deformation. The method of claim 1, And the head portion has an annular flange portion and an annular groove on its outer circumferential surface, and a hole provided therein with threads provided on one end opposite the one end. The method of claim 2, And the head portion is provided with a seal portion projecting toward the opening of the hole at one end adjacent to the axial hole. The method of claim 2, And the head portion is provided with a sealing portion having a concave surface at the bottom of the hole at one end adjacent to the axial hole. And a hose coupling connected to at least one end of the hose member, The hose coupling, A tube-shaped nipple portion having an axial hole, A tubular sleeve portion extending axially on the nipple portion, the tubular sleeve portion being inserted such that at least one end of the hose member is fixed inside the nipple portion and the pocket therebetween; A hose assembly having a head portion at one end thereof coupled to one end of the nipple portion and the sleeve portion, the head portion being provided so that the axial hole passes therethrough. Wherein the nipple portion, the sleeve portion and the head portion are molded from one molding material, and at least the nipple portion is formed by plastic deformation. A cylindrical protrusion formed as a tubular nipple by plastic deformation; A tubular sleeve portion extending axially on the protrusion, And a base portion having one end thereof coupled with one end of the protruding portion and the sleeve portion, In an intermediate molded article used to form a hose coupling by plastic deformation, The protruding portion, the sleeve portion and the base portion is an intermediate molded article, characterized in that molded from one molding material. The method of claim 6, And wherein the protrusion is shorter in length in the axial direction than the sleeve portion, wherein the molded part is used for forming the hose coupling by plastic deformation. The method of claim 6, Wherein the volume of the protrusions is substantially the same as the volume of the nipple portion to be formed later by plastic deformation. The method of claim 6, Wherein the protrusion has a diameter substantially the same as the nipple portion to be formed later by plastic deformation. The method of claim 6, The base portion having a central wall portion located at one end of the protruding portion and the sleeve portion and a hole located at one end opposite to the one end, the intermediate being used to form a hose coupling by plastic deformation. Molded products. The method of claim 10, Said head portion being provided with a seal in said hole at one end of said opposite end thereof, wherein said molded part is used to form a hose coupling by plastic deformation. The method of claim 6, And the head portion has an annular flange portion on its outer circumferential surface, wherein the molded part is used for forming the hose coupling by plastic deformation. An inner tube portion having an axial hole, An outer tube portion extending axially on the inner tube portion; A coaxial double tubular structure having a base portion at one end thereof provided with a base portion at which one end of the nipple portion and the sleeve portion are coupled so that the hole in the axial direction is provided therethrough. And said inner tube portion, said outer tube portion and said base portion are molded from one molding material, said inner tube portion being harder than said outer tube portion. The method of claim 13, Wherein said inner tube portion is a nipple portion of a hose coupling and said outer tube portion is a sleeve portion thereof. The method of claim 14, Wherein said inner tube portion has a Rockwell B hardness of 90-95 and said outer tube portion has a Rockwell B hardness of 55-60. The method of claim 14, Wherein said inner tube portion has a hardness greater than 150 Hv Vickers scale and said outer tube portion has a hardness less than 150 Hv Vickers scale. The method of claim 14, And the inner tube portion has a hardness of 160 Hv to 240 Hv Vickers scale, and the outer tube portion has a hardness of 90 Hv to 150 Hv Vickers scale. The method of claim 13, And said base portion has a hole provided with a thread therein at one end opposite said one end. The method of claim 13, And said base portion has a thread on its outer circumferential surface. The method of claim 18, And said base portion has a rectangular shape. The method of claim 18 or 19, And said thread has a hardness greater than 120 Hv Vickers scale. The method of claim 21, And said thread has a hardness of 120 Hv to 180 Hv Vickers scale. The method of claim 13, And said base portion has an eye ring and neck portion extending from an opposite end of said one end thereof. The method of claim 23, And said eye ring has a hardness greater than 90 Hv Vickers scale. And a hose coupling connected to at least one end of the hose member, The hose coupling, A tube-shaped nipple portion having an axial hole, A tubular sleeve portion extending axially on the nipple portion, the tubular sleeve portion being inserted such that at least one end of the hose member is fixed inside the nipple portion and the pocket therebetween; A brake hose coupling assembly having a head portion provided at one end thereof such that the nipple portion and one end of the sleeve portion are coupled to each other so that the axial hole passes therethrough. And wherein the nipple portion, the sleeve portion and the head portion are molded from one molding material, and at least the nipple portion is harder than the sleeve portion. A cylindrical protrusion, a tubular sleeve extending in the axial direction on the protrusion, and a head portion at one end thereof to which the protrusion and the one end of the sleeve are coupled; In the method for producing a hose coupling by plastic deformation from an intermediate molded article, molded from a molding material, And plastically deforming the protrusion to form a tube-shaped nipple portion. The plastic member is plastically deformed to form an intermediate molded article having a cylindrical protrusion, a tube-shaped sleeve portion extending in the axial direction on the protrusion, and a head portion at one end thereof coupled with the protrusion and one end of the sleeve portion. To do that, Heat treating the intermediate molded article under predetermined thermal conditions; Plastically deforming the protrusion to form a tubular nipple portion, A method of producing a hose coupling by plastic deformation from an intermediate molded article. The method of claim 27, Wherein the plastic deformation of the protrusions is carried out by back extrusion. The method of claim 28, Said plastic deformation of said protrusion comprises deformation of said head portion for forming an annular flange on its outer circumferential surface. The plastic member is plastically deformed to obtain an intermediate molded article having a cylindrical protrusion, a tubular sleeve portion extending in the axial direction on the protrusion, and a head portion at one end thereof to which the protrusion and the sleeve portion are coupled. To do that, Plastically deforming the protrusion to form a tubular nipple portion, A method of producing a hose coupling by plastic deformation from an intermediate molded article. The method of claim 30, And machining the head portion to form a thread on its outer circumferential surface, wherein the hose coupling is produced by plastic deformation from an intermediate molded article.