JPH04296285A - Hose joint - Google Patents

Abstract

PURPOSE:To perform a clamping job uniformly and easily in use of mechanical component deformation by forming a base, a nipple and a sleeve of a hose joint separately each, and facilitating the manufacture and assembly of these elements, while clamping them tight with a form memory alloyed ring member. CONSTITUTION:When a hose joint is manufactured, a base 1, a nipple 2 and a sleeve 3 are formed separately each in advance. At this time, the base 1 is composed of a central part 10 with a through hole 11 and a tapered seat surface 12, an engaging part 13 with an internal thread and a tubular part 14. First a ring member 4 consisting of a form memory alloy is set up in the tubular part 14, and one end of the nipple 2 is inserted into an interval between them. Next, one end of the sleeve 3 is inserted into an interval between the nipple 2 and the ring member 4 at a position of the tubular part 14. Subsequently, the ring member 4 is heated, and the form memory alloy is deformed so as to have the volume contracted. With this constitution, the sleeve 3 and the nipple 2 are also contracted and thereby made contact with the tubular part 14 under pressure.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose joint that is fastened to the end of a hose and used to connect the hose to other parts.

0002

2. Description of the Related Art FIG. 5 shows a conventionally used hose joint. This hose joint includes a base 100 made of a female type cap that is connected to other parts by screwing, a nipple 101 that is integrally formed with the base 100 and projects in the axial direction.
Sleeve 20 joined to nipple 101 by caulking
It consists of 0. With this hose fitting, nipple 1
A hose is inserted into a space having a ring-shaped cross section surrounded by the outer circumferential surface of the sleeve 200 and the inner circumferential surface of the sleeve 200.
By mechanically reducing the diameter of 0 to the inner diameter side, it is caulked and fastened to the hose.

[0003] In this hose joint, the base 100 and the nipple 101 are generally manufactured by cutting. However, when forming such a complicated shape by cutting, there is a problem in that the loss of man-hours and materials is large. Therefore, as shown in FIG. 6, a hose joint is also used in which a base 103 and a nipple 104 are formed separately and then integrally joined by brazing.

0004

However, even in the above-mentioned hose joint, the number of man-hours required for brazing is relatively large, and there is a need to further reduce the number of manufacturing man-hours. Another problem is that it requires a large number of inspection steps to ensure reliable sealing at the brazed portion. The present invention has been made in view of these circumstances, and aims to reduce the number of man-hours during manufacturing by eliminating the brazing process, and to improve the reliability of sealing performance.

[0005]

[Means for Solving the Problems] A hose joint of the present invention that solves the above problems has a through hole penetrating in the axial direction, an engaging portion formed on one end side that engages and fixes with another component, and a through hole. a thick-walled base having a cylindrical part formed coaxially with the cylindrical part and protruding toward the other end; a nipple having a cylindrical shape and having one end inserted so as to cover the cylindrical part; and a cylindrical part having a diameter larger than that of the nipple. A sleeve whose diameter is reduced at one end and is inserted over the tube part to cover the nipple;
It is characterized by comprising a shape memory alloy ring member that undergoes shape memory deformation in the direction of diameter reduction on the cylindrical portion and integrally sandwiches the nipple and the sleeve with the outer circumferential surface of the cylindrical portion.

The greatest feature of the present invention is that the base, nipple, and sleeve are each formed separately, and the nipple and sleeve are integrally fastened to the base using a ring member made of a shape memory alloy. The shape memory alloy ring member is formed in a ring shape from a shape memory alloy,
The shape is memorized with a predetermined inner diameter. After the base, nipple, and sleeve are assembled in the enlarged state, it is assembled to the outside of the sleeve, and when heated to a predetermined temperature, it undergoes shape memory deformation and becomes smaller in diameter. This ring member is made of Ni-Ti alloy, Cu-
It can be formed from a shape memory alloy such as a Zn-Al alloy.

[0007] It is also preferable that a locking portion protruding radially outward or inward is provided at the end portion of the nipple and the sleeve to be fastened to the base portion, so as to be configured to lock with the ring member or the base portion. In this way, relative movement of the nipple and sleeve in the axial direction with respect to the ring member or the base is reliably prevented.

[0008]

Effects and Effects of the Invention In the hose joint of the present invention, by forming the base, nipple, and sleeve as separate members, the shapes of each are simple and can be manufactured with a small number of man-hours. And in the state before the conclusion,
Each can be easily assembled. Next, they are fastened using a shape memory alloy ring member, and since the ring member has been enlarged in diameter in advance, it can be easily assembled to the outside of the sleeve. By heating, the ring member is deformed in one way to a predetermined inner diameter and reduced in diameter. Then, the sleeve and nipple contract in diameter under the force of the diameter contracting force of the ring member, and are clamped and fastened between the ring member and the base.

Therefore, according to the hose joint of the present invention,
Since the nipple and the sleeve are uniformly fastened in the circumferential direction by mechanical plastic deformation, the sealing performance is more reliable than brazing. Furthermore, since it can be easily fastened simply by heating, the number of man-hours can be significantly reduced.

0010

[Examples] Hereinafter, the present invention will be explained in detail using examples. (Embodiment 1) FIGS. 1 and 2 show a hose joint according to an embodiment of the present invention. This hose joint has a base 1 and a nipple 2.
, a sleeve 3 and a ring member 4. Then, while the base 1 engages with other parts, a hose is inserted between the outer circumferential surface of the nipple 2 and the inner circumferential surface of the sleeve 3, and the hoses are coupled by caulking the sleeve 3 in the radial direction.

The base 1 has a through hole 11 and a tapered sheet surface 1 formed on the end surface of the through hole 11 and brought into close contact with a mating component.
2, and an engaging portion 13 formed coaxially with the through hole 11 on one end side of the central portion 10 and having a female screw portion.
and a cylindrical portion 14 formed coaxially with the through hole 11 on the other end side of the central portion 10, and is formed by cutting from a hard steel material.

The nipple 2 is formed from a mild steel pipe, and a cylindrical portion 14 is inserted into one end of the nipple 2 so as to be in contact with the outer surface of the cylindrical portion 14 . The sleeve 3 is also formed from a mild steel pipe, and one end is reduced in diameter and the nipple 2 is connected to the outside of the cylindrical portion 14.
It is inserted in contact with the outer surface of the and ring member 4
is a copper-based shape memory alloy (“Memocouple” manufactured by Furukawa Electric Co., Ltd.)
One end of the nipple 2 and sleeve 3 are sandwiched between the tube portion 14 and the nipple 2 and sleeve 3 are integrally fastened to the base portion 1.

To manufacture the hose joint of this embodiment, the base 1, nipple 2 and sleeve 3 are formed respectively. First, the ring member 4 is placed in the cylindrical portion 14, and one end of the nipple 2 is inserted into the gap between the inner circumferential surface of the ring member 4 and the outer circumferential surface of the cylindrical portion 14. Since the inner diameter of one end of the nipple 2 is slightly larger than the outer diameter of the cylindrical portion 14, the nipple 2 can be easily inserted. Next, attach one end of the sleeve 3,
The outer peripheral surface of the nipple 2 and the ring member 4 at the position of the cylindrical portion 14
Insert into the gap between the inner peripheral surface of the Since the inner diameter of one end of the sleeve 3 is larger than the outer diameter of one end of the nipple 2, the sleeve 3 can be easily inserted.

[0014] By heating the ring member 4 to 150° C. or higher, the ring member 4 undergoes shape memory deformation so that its volume shrinks by about 4%, and its diameter is reduced. This diameter-reducing force is transmitted to the sleeve 3 and nipple 2, which also contract in diameter and come into pressure contact with the cylindrical portion 14. One end of each of the nipple 2 and the sleeve 3 is clamped and fastened between the ring member 4 and the cylindrical portion 14.

That is, according to the hose joint of this embodiment,
The base 1, the nipple 2, and the sleeve 3 have simple shapes and are easy to manufacture. Furthermore, since the dimensions of each assembly location are formed with a margin, assembly is easy. Furthermore, it is only necessary to heat it when tightening. Therefore, it can be manufactured extremely easily and the number of manufacturing steps can be reduced.

[0016] Also, one end of the nipple 2 is uniformly reduced in diameter around the entire circumference through the sleeve 3, and uniformly deformed plastically to form the cylindrical portion 1.
4. Pressed against the surface. Therefore, the reliability of sealing performance is improved compared to joining by brazing. (Example 2) A hose joint of this example is shown in FIGS. 3 and 4. This hose joint is the same as that in Example 1 except that the shapes of the connecting portions of the cylindrical portion 14, nipple 2, and sleeve 3 are different.

That is, the cylindrical portion 14 has a ring-shaped groove portion 15 formed on the outer circumferential surface near the center portion 10 so as to go around the circumferential direction. Further, at one end of the nipple 2 and the sleeve 3, ring-shaped bent portions 20 and 30 are formed by being bent toward the inner circumferential side. The ends of the nipple 2 and the sleeve 3 are fastened to the cylindrical part 14 as in the first embodiment, and the bent part 20 of the nipple 2 engages with the groove part 15, and the bent part 30 of the sleeve 3 is connected to the tube part 14. It engages with the end surface of the bent portion 20. This prevents the nipple 2 and sleeve 3 from moving relative to the base 1 in the axial direction.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the configuration of a hose joint according to an embodiment of the present invention.

FIG. 2 is a front view showing a half section of a hose joint according to an embodiment of the present invention.

FIG. 3 is a front view showing a half section of a hose joint according to a second embodiment of the present invention.

FIG. 4 is an enlarged sectional view of the main part of FIG. 3;

FIG. 5 is a front view showing a half section of a conventional hose joint.

FIG. 6 is a sectional view of another conventional hose joint.

[Explanation of symbols]

1: Base 2: Nipple 3
: Sleeve 4: Ring member 10: Center part 11: Through hole 12:
Seat surface 13: Engaging portion 14: Cylinder portion 15: Groove portion 2
0, 30: Bent part

Claims (1)

[Claims] Claim: 1. A through hole penetrating in the axial direction, an engaging portion formed on one end side to be engaged and fixed with another component, and a cylindrical portion formed coaxially with the through hole and protruding toward the other end side. , a thick-walled base having a cylindrical shape with one end inserted over the cylindrical portion, and a cylindrical shape with a larger diameter than the nipple with one end reduced in diameter so as to fit over the cylindrical portion. A sleeve inserted over the nipple and a shape-memory alloy that deforms shape-memory in the direction of diameter reduction on the cylindrical portion and integrally holds the nipple and the sleeve between the outer circumferential surface of the cylindrical portion. A hose joint characterized by comprising a ring member.