JPH109468A - Metal fitting for hose and brake hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure integration of components of metal fitting for connection by providing the fitting with a niple part having a set hardness larger than a socket part and having a set Vickers hardness of a specified value or above, and with a socket part having a specified Vickers hardness or below. SOLUTION: On the outer circumference of a niple part 2 a socket part 3 is formed. They 2, 3 are connected at the one end to have a head part 4. All the parts 2, 3, 4 are integrally formed of a same material. At a boundary position between the parts 3, 4 a stepped flange part 6 is formed. The part 2 has a larger hardness than the part 3 while a thread part 5 a has larger hardness than the part 3. The part 2 has a set Vickers hardness of 150Hv or above while the part 3 has a set Vickers hardness of 150Hv or below. Accordingly components of metal fitting for connection 1 can be integrated for improving the reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose fitting having a socket on the outer periphery of a nipple, and a brake hose attached to a hose end.

[0002]

2. Description of the Related Art At the mounting end of an industrial hose, a hose fitting is used in consideration of detachability, leakage prevention and reliability. FIG. 9 shows an example of this type of hose fitting conventionally known. The fitting 90 is an outer fitting 91.
And an inner fitting 92 fixed to the inside of the outer fitting 91 with a copper brazing or the like. The outer fitting 91 includes a head portion 93 and a socket portion 94. The head portion 93 has a screw portion 95 on the inside, and has a groove portion 96 and a brim portion 97 on the outside. The inner fitting 92 includes a seal part 98 and a cylindrical nipple part 99, and the seal part 98 is located inside the head 93. Further, the inner fitting 92 is formed with a shaft hole 98 serving as a fluid passage penetrating from the nipple portion 99 to the seal portion 910. Thus the head 93
The female screw thread 95 is called a female fitting. The end of a hose (not shown) is inserted into the socket 94, and the inner diameter of the socket 95 is held by the nipple 99. The hose fitting 90 is fixed by caulking the portion 94, and the screw portion 95 and the seal portion 910 are connected to the connection portion of the target device.

Accordingly, the socket portion 94 that is deformed by caulking is formed.
If the hardness is not more than a certain hardness, there is a possibility that cracks or the like may occur. Conversely, if the hardness of the nipple portion 99 is not equal to or more than a certain value, it may be crushed at the time of crimping, and there is a possibility that the sealability may be reduced and the inner diameter of the hose may not be secured. For this reason, conventionally, the nipple portion inner metal fitting 92 is formed by using a hard material different from steel of the material of the outer metal fitting 91, for example, chrome molybdenum steel, and the inner metal fitting 92 is formed by copper brazing or the like.
1 was fixed.

As a hose fitting, in addition to the female fitting 90 shown in FIG. 9, a head 103 as shown in FIG.
The male fitting 100 has a male screw 105 formed therein.
As with the female fitting 90, the male fitting 100 has a socket 104 formed integrally with the head 103 and a nipple 109 fitted into the hole 106 of the head 103. In addition, as shown in FIG.
The head 113 has an annular glasses part 115 and a neck 116
The neck portion 116 is integrated with the socket portion 114, and the eyeglass portion 115 and the nipple portion 119 are fitted to both axial end portions of the neck portion 116, respectively. Then, as shown in FIG.
The head 123 has a rectangular cross section, and a screw portion 125
Is formed therein, and a shaft hole 126 serving as a flow passage that is refracted and extended from the screw portion 125 is formed therein,
The socket part 124 and the nipple part 129 are attached to the opening side of the shaft hole 126.

[0005]

The conventional hose fittings manufactured by copper brazing or the like have the following problems.

(1) At least a socket portion and a nipple portion are separately formed and fitted to each other. Since a further brazing step is required after the molding, the number of steps and the number of parts are increased. In particular, since high precision is required for the fitting portion of each component, the management becomes complicated and the cost increases.

(2) The reliability is low because there is a risk of forgetting brazing or falling.

(3) It is difficult to guarantee the airtightness of the fitting portion between the socket and the nipple.

(4) The nipple may be eccentric with respect to the socket, and the hose insertability is deteriorated.

(5) The thread portions of the female fitting and the male fitting are formed of the same material as that of the socket, and are cut or rolled before brazing, so that the hardness is the same as that of the socket. The strength is reduced when connecting (tightening) with a mating component, and the liquid is likely to leak due to breakage of the screw portion and the inability to transmit stress to the seal portion.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and the reliability can be improved by integrating the components of the fitting, and the manufacturing process can be simplified. It is an object of the present invention to provide a hose fitting that can be reduced in cost.

[0012]

In order to solve the above-mentioned problems,
The hose fitting of the present invention has a tubular nipple portion, a tubular socket portion provided on the outer periphery of the nipple portion, and a head portion connecting the nipple portion and the socket portion at one end. , The nipple part and the head are integrally formed of the same material, the nipple part has a greater hardness than the socket part, and the nipple part has a Vickers hardness of 150 Hv or more, and the socket part has a Vickers hardness. Is not more than 150 Hv. The head may have a screw portion having a hardness different from that of the nipple portion and the socket portion. The screw portion preferably has a hardness greater than that of the socket portion, and the Vickers hardness of the socket portion may be 150 Hv or less, the nipple portion may be 150 Hv or more, and the screw portion may be 120 Hv or more. Further, the head may have glasses having hardness different from that of the nipple and the socket. The Vickers hardness of the socket may be 150 Hv or less, the nipple may be 150 Hv or more, and the glasses may be 90 Hv or more. The head may be flat with a rectangular cross section.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in the drawing, a hose fitting of the present invention has a nipple part 2, a socket part 3, and a head 4 for connecting the nipple part 2 and the socket part 3 at one end. Since the nipple portion 2, the socket portion 3 and the head portion 4 are integrally formed of the same material, there is no danger of fluid leakage or the like, and the reliability is improved. Since it has a higher hardness than the socket portion 3, deformation such as crushing of the inner tube at the time of hose crimping can be prevented.

[0014]

FIG. 1 is an explanatory view of a specific embodiment of a hose fitting according to the present invention. The hose fitting 1 includes a nipple portion 2, a socket portion 3 provided on the outer periphery of the nipple portion 2, and a head portion 4 connecting the nipple portion 2 and the socket portion 3 at one end. 2, the socket part 3 and the head part 4 are integrally formed of the same material. A step-shaped collar 6 is formed at a boundary position between the socket 3 and the head 4. The socket portion 3 is formed in a tubular shape having an outer diameter and a length so as to be appropriately fitted to the outer periphery of the hose end. The nipple portion 2 is formed as a small-diameter pipe having substantially the same length as the socket portion 3 and having predetermined outer and inner diameters. The nipple 2 extends from a shaft wall 7 formed radially inward of the flange 6 and is integrally formed. A space 9 opened at one end is formed radially inward of the head portion 4, and a thread groove is formed along the outer edge of the space 9 to form a female screw portion 5. The shaft hole 8 of the nipple portion 2 penetrates through the shaft wall 7 and penetrates into the space 9 formed in the head 4. A frustoconical seal portion 10 is formed on the space 9 side of the shaft wall 7, and a shaft hole 8 penetrates the shaft center. In addition, a groove 11 is formed on the outer peripheral surface of the head 4.

The nipple portion 2, the socket portion 3, and the screw portion 5 are formed to have different hardnesses from each other. That is, as shown in FIG. 2, each point 2a, 2b, 2c, 3a, 3 of the nipple 2, the socket 3, and the screw 5
b, 3c, 5a, 5b, the nipple part 2 has a Vickers hardness of 160 to 240 Hv, preferably 170 to 190.
Hv, socket part 3 is 90-100 Hv, preferably 90
The screw portion 5 is formed so as to be 120 to 180 Hv, preferably 150 to 170 Hv. Therefore, the nipple portion 2 of 160 Hv or more has higher hardness than the socket portion 3 of 150 Hv or less, and the screw portion 5 has a higher hardness than the socket portion 3. The seal portion 10 is equivalent to the screw portion 5, for example, 150 to 170.
Hv.

Next, one embodiment of the method of manufacturing the hose fitting of the present invention will be described. First, as shown in FIG. 3, an intermediate molded product (blank material) 15 in which the projection 18, the socket 3, and the base 16 are integrated is molded by plastic working.
When the intermediate molded product 15 is formed by, for example, cold forging, a carbon steel wire for cold heading (SWCH12 or SWCH15) or an equivalent product thereof is selected as a material, and a material subjected to normal annealing and lubrication is used. Used. As the plastic working equipment, a multi-stage parts former or the like is used. The intermediate molded product 15 has a columnar projection 18, a socket 3 provided on the outer periphery of the projection 18, and a base 16 connecting the projection 18 and the socket 3 at one end. The part 18, the socket part 3 and the base part 16 are integrally formed of the same material, and the base part 16 is provided with a pilot hole 17 in which the screw part 5 is formed. The protrusion 18 has a columnar shape, has the same volume and outer diameter as the nipple 2, and has a shaft wall 7.
One end is continuously provided and integrated with the partition wall portion 19 corresponding to the above. It is preferable that the outer diameter d of the projection be the same as the outer diameter of the nipple 2 so as to reduce the burden on the subsequent steps.

Next, the intermediate molded product 15 is annealed. This facilitates the plastic working of the projections 18 in a later step and makes the tubular portion 3 (socket portion 3) have a predetermined hardness, for example, Vickers hardness of 90 to 150 Hv. Subsequent to the annealing step, the nipple portion 2 is formed by performing plastic working on the projection 18. At the time of this plastic working, for example, the intermediate molded product 15 is fixed to a die, a guide holder (not shown) provided with a punch is inserted into the socket portion 3 and the punch is
8 and a small-diameter pipe, that is, the nipple portion 2 is formed by backward extrusion. The nipple portion 2 is hardened through the backward extrusion, and can have a predetermined hardness, for example, a Vickers hardness of 160 to 240 Hv. The punch press-fitting may be performed over several orders such as two steps. Then, following the molding of the nipple portion 2, the shaft hole 8 is penetrated to the space 9 by punching.
It is preferable to form the seal portion 10 in parallel with the nipple formation. For example, if a die having a predetermined shape is formed in a die, the seal portion 10 is formed at the same time as the nipple portion 2 is formed.
Can be formed, and a hardness of 150 to 170 Hv in Vickers hardness can be obtained by work hardening at this time. The collar 6 is formed by performing plastic working on the head 4 simultaneously with or separately from the formation of the nipple 2. Further, the screw portion 5 is plastically worked by rolling.
Since this processing is performed after annealing, it can be hardened to a predetermined hardness, for example, Vickers hardness of 120 to 180 Hv. Next, the groove 11 is formed by machining using, for example, an NC machine tool or an automatic lathe. with this,
A hose female fitting 1 of a predetermined shape shown in FIG. 1 is obtained.

As described above, the hardness of the nipple portion 2 and that of the socket portion 3 integrally formed of the same material are made different so that the nipple portion 2 has a higher hardness than the socket portion 3. There is no danger of liquid leakage even when adopted for a high hydraulic hose, and a highly reliable female fitting 1 that is easy to fix to the hose by caulking and that the nipple portion 2 is not crushed. it can. And since the number of parts and the number of molding steps are reduced,
Cost reduction is achieved. The screw 5 is also the nipple 2
Further, since the hardness is made different from that of the socket portion 3 so as to be higher than that of the socket portion 3, there is no possibility of breakage and the fastening strength can be improved. In this embodiment, the nipple portion 2, the socket portion 3, and the head portion 4 are formed by plastic working, so that the dimensional stability is excellent, the mass productivity is improved, and there is almost no cutting process. The generation of chips can be minimized, and the yield can be improved. Then, the socket portion 3 can be softened to have a desired hardness through an annealing process, and the nipple portion 2 can be increased to a desired hardness by undergoing backward extrusion plastic working.

The present invention is not limited to the female fitting 1 but can also be applied to a male fitting 41 as shown in FIG. That is, in this embodiment, the male thread 45 is attached to the head 44.
Are formed, and a shaft hole 48 from the nipple portion 42 is formed to extend inside. The nipple portion 42, the socket portion 43, and the screw portion 45 are integrally formed of the same material, and have different hardnesses. That is, the nipple portion 42 has an optimum hardness so as not to be crushed by caulking, the socket portion 43 has an optimum hardness for easy caulking deformation, and the screw portion 45 has an optimum hardness for securing the strength of fastening. It has been molded. When manufacturing the male fitting 41, a manufacturing method centering on plastic working can be adopted as in the case of the female fitting 1 described above.

FIG. 5 shows another embodiment of the present invention, in which the head 55 is applied to a spectacle metal fitting 51 having a spectacle portion 55a and a neck portion 55b. The eyeglass fitting 51 has a shaft hole 58 communicating with the hole 55c of the eyeglass portion 55a via the nipple portion 52 via the neck portion 55b.
Each part including the socket part 53 is integrally formed of the same material by plastic working or the like, and the Vickers hardness is 90 to 150 Hv in the socket part 53 and 1 in the nipple part 52.
It is formed in the range of 50 to 250 Hv, and in the range of 90 to 250 Hv in the glasses section 55. To manufacture the eyeglass fittings 51,
As in the first embodiment, the carbon content is 0.08 to 0.2.
After forming an intermediate molded product (not shown) with low carbon steel of about 0%, the socket portion 53 can have a Vickers hardness of 90 to 150 Hv by appropriately selecting annealing treatment conditions. Next, the nipple portion 52 is processed by plastic working, and the Vickers hardness is reduced to 15 by the work hardening.
It can be 0 to 250 Hv. The glasses unit 55
When finished to a state close to the finished product before the annealing treatment, the Vickers hardness becomes 90 to 150 Hv, but the eyeglass portion equivalent part of the intermediate molded product is made into a spherical shape, and it is formed into a circular shape (annular shape) in a subsequent process. Plastic processing, or the hole 55 of the eyeglass part 55
When c is processed by punching by plastic working, the Vickers hardness can be set to 150 to 250 Hv by work hardening. Therefore, the cost is low and the liquid leakage and the nipple
Thus, a highly reliable spectacle metal fitting 51 which is free from crushing and the like and in which the socket portion 53 is easily caulked can be obtained.

FIG. 6 shows another embodiment of the present invention, which is a modification of the eyeglass fitting described in the embodiment of FIG. The difference between the negative fitting 61 and the negative fitting is that the nipple 62, the socket 63, and the neck 65 are different from each other.
b is integrally formed of the same material, and eyeglasses 65a manufactured by cutting or cold forging are connected to the neck 65 by using a copper brazing or the like. In FIG. 6, 6
Reference numeral 6 denotes a connection portion made of copper brazing or the like.

FIG. 7 shows another embodiment of the present invention, in which the present invention is applied to a flat metal fitting 71. The flat metal fitting 71 has a head 74 having a rectangular cross section, a female thread 75 formed on one side thereof, and a screw 75
A shaft hole 78 that is bent at right angles to and extends from the shaft hole 78 is formed.
A frustoconical seal portion 710 is formed at the opening of the shaft hole 78 on the screw portion 75 side. The socket portion 73 and the nipple portion 72 are integrally extended on the side surface of the head 74 on the other opening side of the shaft hole 78. That is, similarly to the above-described embodiment, the whole is integrally formed of the same material, and the hardness of the nipple portion 72, the socket portion 73, and the screw portion 75 are different from each other, and are formed so as to have optimal hardness respectively. I have. Thus, the cost is low, and the highly reliable flat metal fitting 7 free from liquid leakage and crushing of the nipple portion 72 is provided.
1 is obtained.

In the above embodiment, iron or steel is used as a material, but copper, aluminum, or an alloy thereof may be used. Further, the shape of the seal portion 10 is not limited to the illustrated example, but may be a concave seal shape.

FIG. 8 shows an example in which the fitting of the present invention is caulked and fixed to the end of a hose to form a brake hose. Both ends of the hose 80 are inserted between the nipple portion 2 and the socket portion 3 of the fitting 1, and a plurality of portions of the socket portion 2 are compression-molded to form a caulked portion 81.

[0025]

As described above, according to the present invention, the cost can be reduced by reducing the number of molding steps and the number of parts, and each part can be made to have an optimum hardness. An excellent effect that performance, hose insertability, and thread strength can be improved is exhibited.

[Brief description of the drawings]

FIG. 1 is an explanatory side sectional view of an embodiment of a female hose fitting for a hose according to the present invention.

FIG. 2 is an explanatory side sectional view showing a main part of FIG. 1;

FIG. 3 is an explanatory side sectional view of one embodiment of an intermediate molded product used in the present invention.

FIG. 4 is an explanatory side sectional view showing a male fitting for a hose according to another embodiment of the present invention.

FIG. 5 is an explanatory side sectional view showing an eyeglass fitting for a hose according to another embodiment of the present invention.

FIG. 6 is an explanatory side sectional view showing a modification of the eyeglass fitting for a hose according to another embodiment of the present invention.

FIG. 7 is an explanatory side sectional view showing a flat metal fitting for a hose according to another embodiment of the present invention.

FIG. 8 is an explanatory side sectional view of one embodiment of the brake hose of the present invention.

FIG. 9 is an explanatory side sectional view showing a conventional hose female fitting.

FIG. 10 is an explanatory side sectional view showing a conventional male fitting for a hose.

FIG. 11 is an explanatory side sectional view showing a conventional eyeglass fitting for a hose.

FIG. 12 is an explanatory side sectional view showing a conventional flat metal fitting for a hose.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hose female fitting (hose fitting) 2 Nipple part 3 Socket part 4 Head 5 Screw part 6 Flange part 8 Shaft hole 9 Space 10 Seal part 11 Groove part

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tokuo Tanioka 3-1-1, Sukekawa-cho, Hitachi City, Ibaraki Prefecture Inside the cable plant of Hitachi Cable, Ltd. (72) Kenji Hirose 3-1-1, Sukegawa-machi, Hitachi City, Ibaraki Prefecture No. 1 Hitachi Cable Co., Ltd. Wire Plant (72) Inventor Hideki Hagiwara 3-1-1 Sukekawacho, Hitachi City, Ibaraki Prefecture Hitachi Cable Co., Ltd. Wire Plant (72) Inventor Katsuhiro Aoyagi Ikebukuro, Hitachi No. 1 Hitachi Cable Co., Ltd. Wire Plant

Claims (10)

[Claims] A tubular nipple portion, a tubular socket portion provided on an outer periphery of the nipple portion, and a head connecting the nipple portion and the socket portion at one end. The head and the head are integrally formed of the same material, the nipple has a hardness greater than that of the socket, and the nipple has a Vickers hardness of 150 Hv or more, and the socket has a Vickers hardness of 150 Hv or less. A fitting for a hose, characterized in that there is a hose fitting. 2. The Vickers hardness of the nipple is 160 to 2.
40Hv, and the Vickers hardness of the socket is 90-
The hose fitting according to claim 1, which is 150 Hv. 3. The hose fitting according to claim 1, wherein the female fitting is a female fitting having a screw portion formed along an outer edge of a space formed radially inward of the head. 4. The hose fitting according to claim 1, wherein the fitting is a male fitting having a screw portion formed on the outer periphery of the head. 5. The hose mouth according to claim 1, wherein the head is a rectangular shape, and a flat mouthpiece having a screw portion formed along an outer edge of a space formed inward. Metal fittings. 6. The hose fitting according to claim 3, wherein the screw portion has a Vickers hardness of 120 Hv or more. 7. The screw part has a Vickers hardness of 120 to 180.
The hose fitting according to claim 6, which is Hv. 8. The hose fitting according to claim 1, wherein the head is a glasses fitting comprising a glasses part and a neck part. 9. A hose fitting according to claim 8, wherein the Vickers hardness of the eyeglass portion is 90 Hv or more. 10. A nipple having a tubular portion, a tubular socket provided on the outer periphery of the nipple, and a head connecting the nipple and the socket at one end. The head and the head are integrally formed of the same material, the nipple has a hardness greater than that of the socket, and the nipple has a Vickers hardness of 150 Hv or more, and the socket has a Vickers hardness of 150 Hv or less. A brake hose, wherein a hose end is inserted and fixed between a nipple part and a socket part of a hose fitting.