JP2611903B2 - Joint fitting for hose assembly and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fitting for a hose assembly, and more particularly to a fitting for a rubber hose assembly for various hydraulics and a resin hose assembly for various hydraulics, for example, a power steering hose, a hose for a hydraulic active suspension, and an oil brake. The present invention relates to a hose assembly for an automobile such as a hose, an oil hose, and a fuel hose, and a fitting for a high-pressure hose and an ultra-high-pressure hose assembly for various industries, and a method of manufacturing the same.

[0002]

2. Description of the Related Art A fitting for a hose assembly is used to connect a hose to equipment. A conventional fitting is generally provided with a connection portion such as a female screw or a male screw at one end of a base having a through hole, and a nipple and a sleeve provided on the other side, and a hose is inserted between the nipple and the sleeve.
The sleeves are secured together by crimping. For example, in an assembly fitting used for an oil brake hose, a nipple and a sleeve are formed separately in order to reduce costs.

[0003] As for such a joint fitting composed of two parts, there is a joint fitting described in Japanese Utility Model Laid-Open No. 3-28389 by the present applicant. In the invention described in the above publication, as shown in FIG. 6, the sleeve main body 41 and the nipple main body 43 are welded. The sleeve main body 41 is provided with a connecting portion 47 at one end of a base 45 having a through hole 44, and a sleeve 49 is formed on the opposite side together with a nipple abutting surface 51 that forms a plane perpendicular to the through hole 44. On the other hand, the nipple body 43
Is formed by forming a flange-like joint 55 at one end of a nipple 53. Then, a projection is provided on one of the nipple abutment surface 51 and the flange-like joint portion 55 of the nipple body 43, and the nipple abutment surface 51 and the flange-like joint portion 55 are abutted with each other, by projection welding or friction welding. It is welded and fixed together. The sleeve main body 41 and the nipple main body 43 are mainly manufactured by cutting.

[0004]

However, although the joint fitting having the above structure can be applied to joint fittings of any shape, a large amount of swarf is generated since it is mainly manufactured by cutting. There is a problem that the yield is poor and the material is wasteful. In addition, since the nipple abutting surface 51 and the flange-like joining portion 55 are abutted and welded, the joining portion 57 faces the through-hole 44 and comes into direct contact with the fluid. Furthermore, a welding machine used for welding the sleeve body and the nipple body, equipment for high voltage, and the like are required.

The present invention has been made in view of such a situation, and the sleeve main body and the nipple main body are easily assembled by screwing, a high sealing property is obtained, and the sleeve main body and the nipple main body are manufactured at low cost by forging and rolling. It is an object of the present invention to provide a joint fitting for a hose assembly and a method of manufacturing the same.

[0006]

The present invention has the following configuration to achieve the above object. That is, hose asen
The fitting for fittings is a fitting for hose assembly in which a separately molded sleeve body and a nipple body are integrally fixed, wherein the sleeve body forms a connecting portion on one side of a base and a sleeve on the other side. A nipple insertion hole provided with a female screw is provided in the shaft center of the base, and a nipple abutment surface is formed on the connection portion side of the base.
The nipple body is provided with a flange-shaped joint at one end of the nipple, and a projection on the inner surface of a thick portion formed by engraving a male screw on a part of the outer peripheral surface of the nipple.
By expanding the protrusion to the same plane as the nipple inner surface,
It is characterized by being assembled into the body . In the method of manufacturing the joint fitting, the sleeve body, first, a connection to one side of the base portion by cold forging, and continuously provided a sleeve on the other, Keru set the nipple insertion hole in the axial portion of the base With, before
Forming an intermediate part with a nipple abutting surface on the connection part side of the base part , and then manufacturing it by engraving a female screw by rolling in the nipple insertion hole, while the nipple body is first cold forged One side of the nipple is a thick part for engraving a male screw, a flange-like joint is formed at the tip, and an intermediate part having a projection on the inner surface of the thick part is obtained. A male screw is engraved on the outer peripheral surface of the thick part, and the nipple is
Abutting the flange-shaped joint of the main body, screwing the male screw of the nipple and the female screw of the nipple insertion hole of the sleeve main body, inserting a die into the inner surface of the nipple,
Nipple the protrusion on the inner surface of the nipple thick part by pulling
It is characterized in that the diameter is increased to the same plane as the inner surface of the knurl and assembled integrally.

[0007]

The sleeve main body and the nipple main body are assembled by screwing, so that the sleeve main body and the nipple main body are completely prevented from coming off in the axial direction. Further, the flange-like joint of the nipple body abuts on the nipple abutting surface of the sleeve body to perform positioning.
Both the sleeve body and the nipple body are formed by cold forging the intermediate part first and then the threaded part by rolling, so that no chips are generated and the material cost is reduced, and the productivity is shortened by shortening the processing time. Can be improved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments. FIG. 1 is a side view showing a cross section of an upper half of a fitting for assembly according to the present invention. The fitting for assembly includes a sleeve body 10 and a nipple body 30. The sleeve body 10 includes a base 1 having an outer peripheral surface formed of a hexagonal nut.
A connection portion 13 formed by engraving a female screw is provided at one end of the device 1, and a sleeve 15 is integrally provided at the other end. A nipple insertion hole 19 formed by engraving a female screw 17 is formed in the axis of the base 11. The nipple insertion hole 19 is formed parallel to the axial direction. Further, the side surface of the base 11 facing the opening of the connection portion 13 is a nipple abutment surface 20 which forms a plane perpendicular to the nipple insertion hole 19.

On the other hand, the nipple body 30 has a flange-like joint 33 formed at one end of the nipple 31, and a male screw 35 is engraved on the outer peripheral surface of the nipple 31 adjacent to the flange-like joint 33. I have. To assemble the sleeve body 10 and the nipple body 30, the nipple 3 is inserted into the nipple insertion hole 19 of the sleeve body 10.
1, the female screw 17 and the male screw 35 are screwed together, and the flange-like joint 33 of the nipple body 30 is brought into contact with the nipple abutting surface 20 so as to be integrally assembled.

A description will be given of a method of manufacturing the joint fitting according to the above embodiment by cold forging and rolling. The sleeve main body 10 and the nipple main body 30 are divided and molded in advance. First, as shown in FIG. 2A, the connection port 13a and the sleeve 1 are formed on both sides of the base 11 by cold forging.
5, an intermediate part 10a formed by piercing a nipple insertion hole 19 in the axis of the base 11 is formed. Then, FIG.
As shown in (b), a female screw 17 is formed in the nipple insertion hole 19 of the base 11 by rolling, and a female screw 18 is formed in the inner peripheral surface of the connection port 13a.
And Then, the side surface of the connection portion 13 of the base portion 11 is defined as a nipple abutment surface 20. The outer peripheral surface of the connection portion 13 may be appropriately cut according to a predetermined shape such as a clip mounting groove.

On the other hand, the nipple body 30
As shown in (a), one side of the nipple 31 is formed into a thick portion 31a for engraving a male screw by cold forging,
An intermediate part having a flange-shaped joint 33 formed at the tip is obtained. Thereafter, as shown in FIG. 3B, a male screw 35 is engraved on the outer peripheral surface of the thick portion 31a by rolling.

In order to assemble the sleeve main body 10 and the nipple main body 30 having the above configuration, as shown in FIG. 1, the nipple 31 is inserted into the nipple insertion hole 19 of the sleeve main body 10, and the female screw 17 and the male screw 35 are screwed together. At the same time, the flange-like joint 33 may be brought into contact with the nipple abutment surface 20. The flange-shaped joint 33 is positioned by contacting the nipple abutting surface 20, and the displacement of the nipple in the axial direction is reliably prevented. In addition, since the outer peripheral surface of the nipple body 30 is screwed, it does not come into direct contact with the fluid liquid, and thus a high sealing property can be obtained.

FIGS. 4 and 5 show another embodiment of the nipple body. That is, one side of the nipple 32 is formed into a thick portion 32a for engraving a male screw by cold forging, and a flange-shaped joint portion 34 is formed at a tip end.
An intermediate component having a protrusion 36 on the inner surface of 2a is obtained. Then, as in FIG. 3B, the thick portion 32 is formed by rolling.
Nipple body 39 with male screw 38 engraved on the outer peripheral surface of a
And

In order to assemble the nipple main body 39 and the sleeve main body 10, the nipple 32 is inserted through the nipple insertion hole 19 of the sleeve main body 10, and the female screw 17 is inserted.
And the male screw 38 are screwed together, and the flange-shaped joint 34 is brought into contact with the nipple abutting surface 20. Next, nipple 3
The expansion die 40 inserted into the inside 2 is pulled toward the sleeve side to expand the protrusion 36 to the same plane as the inner surface of the nipple and bulge outward to form a bulge 36a. When the bulging portion 36a is formed, the screw portion is crushed, so that the rotation of the sleeve main body 10 and the nipple main body 39 is completely prevented. Therefore, in the case of the second embodiment, the hose is prevented from coming off in the axial direction and from rotating, and the hose can be more firmly fixed.

[0015]

According to the present invention, since the sleeve body and the nipple body which are separately formed are assembled by screwing, assembly is very easy. Further, since the threaded surface does not directly contact the fluid liquid, the penetration of the fluid liquid can be prevented, and a high sealing property can be obtained. Furthermore, since the intermediate parts to be divided and formed are manufactured by cold forging and rolling, they do not generate chips, and the processing time can be extremely shortened, so that material costs and
Processing costs can be reduced. Also, special welding techniques and welding equipment are not required.

[Brief description of the drawings]

FIG. 1 is a side view showing a cross section of an upper half of an assembly fitting according to the present invention.

FIG. 2 is a side view in which an upper half showing a middle part of the sleeve body is sectioned.

FIG. 3 is a side view in which an upper half of an intermediate part of the nipple main body is sectioned.

FIG. 4 is a side view of an intermediate part of another nipple main body, in which an upper half is sectioned.

FIG. 5 is a cross-sectional side view of an upper half of a fitting for assembly in another embodiment.

FIG. 6 is a cross-sectional side view of an upper half showing a conventional method of assembling a sleeve body and a nipple body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Sleeve main body 11 Base 13 Connection part 15 Sleeve 17 Female screw 19 Nipple insertion hole 20 Nipple abutment surface 30 Nipple main body 31 Nipple 33 Flange joint 35 Male screw 36 Projection 36a Swelling part 39 Nipple main body

Claims (2)

(57) [Claims] In a joint fitting for a hose assembly in which a separately molded sleeve main body and a nipple main body are integrally fixed, the sleeve main body has a connecting portion formed on one side of a base and a sleeve provided on the other side. A nipple insertion hole provided with a female screw is provided in the shaft center portion of the base, and a nipple abutment surface is formed on the connection portion side of the base.
The nipple body is provided with a flange-shaped joint at one end of the nipple, and a projection on the inner surface of a thick portion formed by engraving a male screw on a part of the outer peripheral surface of the nipple.
Part by expanding the diameter to the same plane as the nipple inner surface
A fitting for a hose assembly, characterized in that it is assembled into a hose. Wherein the sleeve body, first, a connection to one side of the base portion by cold forging, and continuously provided a sleeve on the other, with Keru set the nipple insertion hole in the axial portion of the base, before
Forming an intermediate part with a nipple abutting surface on the connection part side of the base part , and then manufacturing it by engraving a female screw by rolling in the nipple insertion hole, while the nipple body is first cold forged One side of the nipple is a thick part for engraving a male screw, a flange-like joint is formed at the tip, and an intermediate part having a projection on the inner surface of the thick part is obtained. A male screw is engraved on the outer peripheral surface of the thick part, and the nipple is
Abutting the flange-shaped joint of the main body, screwing the male screw of the nipple and the female screw of the nipple insertion hole of the sleeve main body, inserting a die into the inner surface of the nipple,
Nipple the protrusion on the inner surface of the nipple thick part by pulling
A method for manufacturing a joint fitting for a hose assembly, characterized in that the diameter of the joint fitting is increased to the same plane as the inner surface of the hose and assembled integrally.