JPH071073B2 - Hose connection joint and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hose connection joint and a method for manufacturing the same,
Especially as a supply pipe for various gases and liquids, it is generally used for vehicles, machines,
The present invention relates to a connection joint fixed to an end of a flexible hose such as rubber or resin that is often arranged and used in equipments and the like, and a manufacturing method thereof.

(Prior Art) Generally, as a conventional hose connection joint, as shown in FIGS.
As shown in the figure, it is composed of a socket 2 in which a nipple portion and a connecting portion are continuously provided, and a sleeve 3 which holds a space on the outside of the nipple and covers the outer space. A hose 4 is inserted into the space.
It is fixed by swaging the sleeve 3.

The connection joint shown in FIG. 11 is composed of a socket 2 and a sleeve 3 formed by cutting, and the socket 2 is a nipple.
2a and the connecting portion 2b are connected to each other, and a step is formed at the rear end of the connecting portion 2b.
2c is formed, and the stepped portion 2c is assembled by fitting into the assembly hole 3b formed in the bottom portion 3a of the sleeve 3.

The connection joint shown in FIG. 12 has substantially the same structure as the connection joint, but an annular groove 2d is formed in place of the stepped portion 2c at the rear end of the connection portion 2b, and the annular groove is formed. It is assembled by press-fitting the inner peripheral surface of the bottom portion 3a of the sleeve 3 into 2d.

Then, in both connection joints, a hose 4 is inserted into a gap between the nipple 2a and the sleeve 3, and the sleeve 3 is pressure-deformed by a tightening machine and integrally fixed.

The shape of the connecting portion 2b of the socket 2 is of course appropriately changed according to the shape of the parts to be connected.

(Problems to be Solved by the Invention) However, although the conventional assembly method as shown in FIGS. 11 and 12 can provide an inexpensive product, it has the following problems.

That is, in the structure shown in FIG. 11 among the structures of the conventional example, the socket 2 and the sleeve 3 are not mechanically fixed, but are held by the elastic force of the hose 4 when the sleeve 3 is tightened. I'm just there. Therefore, the connection between the socket 2 and the sleeve 3 becomes uncertain, sufficient performance cannot be obtained for high pressure use, and the hose 4
The sticking force is further reduced as the elastic force of is decreased.

Further, in the structure shown in FIG. 12, although mechanically fixed, the pullout resistance is improved as compared with the conventional example, but when the elastic force of the hose 4 is reduced, the sleeve 3 is easily rotated, As a result, the adhesive strength also decreases.

Generally, a method of engraving and screwing both the socket 2 and the sleeve 3 and a method of fixing them by brazing are used. In these methods, the socket 2 and the sleeve 3 are integrated. However, in the former case, a lot of time is required for the thread cutting work, and in the latter case, a lot of time for the brazing work, and the brazing material and fuel are required. Therefore, there is a problem that the cost of the product is increased as a whole.

The present invention has been made in view of the above points, and an object thereof is to provide a connection joint in which a socket and a sleeve are fixed to each other by a simple structure for preventing rotation and a method for manufacturing the same.

(Means for Solving the Problems) In order to achieve the above object, a connection joint according to the present invention includes a socket having a nipple and a connection portion, and a sleeve having a bottom portion provided with an assembly hole for inserting the nipple. In the hose connection joint consisting of, a stepped portion having a width dimension larger than the wall thickness dimension of the sleeve bottom portion is provided between the nipple of the socket and the connection portion, while,
A slit is formed on the inner peripheral surface of the bottom of the sleeve,
It is characterized in that the step and the sleeve are fitted into the assembling hole of the sleeve, and the projecting portion formed by rolling and deforming the step is inserted into the slit to fix the socket and the sleeve.

It is preferable to form a rolling portion that engages the inner surface of the peripheral edge of the bottom portion together with the protruding portion.

Then, as the method for manufacturing the connection joint, a socket having a stepped portion between the nipple and the connection portion, and an assembly hole for inserting the nipple in the bottom portion are bored, and an inner peripheral surface of the assembly hole is formed. A sleeve provided with a slit is formed, and the step portion of the socket is fitted into the assembly hole by inserting the nipple into the sleeve from the assembly hole,
Next, by inserting the pressing portion of the punch member having the convex portion projecting at the same phase position as the slit into the gap between the nipple and the sleeve, and pressing the punch member while holding the socket with the split chuck. In the manufacturing method, the stepped portion is rolled and deformed to form a protruding portion in the slit, and the socket and the sleeve are integrally fixed.

Further, the projecting dimension of the convex portion is smaller than the dimension difference between the step portion and the wall thickness of the bottom portion of the sleeve, or by pressing a punch member having a pressing portion having a smooth front end surface, In addition to forming the protruding portion, a rolling portion that engages with the inner peripheral surface of the bottom portion may be formed.

(Operation) Since the protrusion in the slit configured as described above bites into the slit, rotation of the sleeve is prevented, and when the protrusion is in close contact with the inner circumferential surface of the slit, the rotation is prevented. At the same time, it works to prevent the shaft from coming off.

Further, by forming the rolling portion that engages with the inner surface of the bottom peripheral edge of the sleeve, the axial slippage is further prevented.

Further, when the protruding dimension of the protruding portion protruding from the pressing portion of the punch member tip is larger than the dimensional difference between the step portion and the wall thickness of the sleeve bottom portion, only the protruding portion in the slit is formed, and the protruding portion of the protruding portion is formed. When the dimension is smaller than the dimension difference or is a smooth surface, a rolling portion that engages with the inner surface of the bottom peripheral edge is formed together with the protrusion in the slit.

(Example) Hereinafter, the Example of the hose connection joint which concerns on this invention is described.

1 is a sectional view of a connection joint, FIG. 2 is a sectional view of a socket, FIG. 3 is a side view of a sleeve, and FIG. 4 is a longitudinal sectional view of the sleeve.

The connection joint 10 according to the present invention comprises a socket 20 and a sleeve 30.

The socket 20 is composed of a nipple 21 that holds the hose 4 and a connecting portion 22 that connects to a mating component, and a ridge-shaped projection 23 having a serrated cross section is formed on the outer peripheral surface of the nipple 21, and the rear end portion of the connecting portion 22 is formed. A step portion 24 that fits into the assembly hole of the sleeve 30 is formed. The chevron projection 23 may be changed to another shape or omitted.

On the other hand, the sleeve 30 is composed of a tubular body 31 that is clamped by tightening the hose 4, and a bottom portion 32 that is connected to one end of the tubular body. The bottom portion 32 has an assembly hole for fitting with the step portion 24 of the socket 20. 33 is provided, and further, the inner peripheral surface of the assembly hole 33
A slit 35 is formed in 34. In the embodiment, the slits 35 are provided on the four sides of the upper, lower, left, and right sides, but the number of the slits 35 may be one or more, and the size, shape, etc. are appropriately determined depending on the size, material, etc. of the connection joint. do it.

Further, a cutout 36 is provided at the same phase position as the slit 35 at the end of the tubular body 31. When assembling this notch 36,
It is effective as a mark for matching the phase of the convex portion provided at the tip of the punch with the slit 35.

In the above configuration, if the width dimension of the stepped portion 24 of the socket 20 is X and the wall thickness dimension of the bottom portion 32 of the sleeve 30 is Y, then X> Y
Due to this dimensional difference, the stepped portion 24 is formed so as to be able to bite into the slit 35 by rolling deformation.

FIG. 5 is an enlarged sectional view of a main portion of the slit 35 portion and the non-slit portion in FIG. 5A in a state where the socket 20 and the sleeve 30 are assembled. After the step portion 24 of the socket 20 is fitted into the assembling hole 33 of the sleeve 30, the step portion 24 is axially pressed to be deformed by rolling, so that the protruding portion 24a bites into the slit 35 (Fig. A). And the rolling part 2 that engages with the inner surface of the peripheral edge of the bottom part 32.
It is fixed integrally by 4b (Figure B).

In this way, the projecting portion 24a which is pressed and deformed by the step portion 24 is prevented from rotating with the socket 20, and the axial disengagement is prevented by the rolling portion 24b, so that both are completely integrated. .

6 (a) to 6 (d) show how the socket 20 and the sleeve 30 are fixed to each other.

First, FIG. 6 (a) shows a projecting portion 24a that is bitten into the slit 35 by rolling deformation of the step portion 24 by pressing.
Does not adhere to the inner peripheral surface of the slit 35, and a slight gap is formed. This prevents rotation with the socket 20.

In FIG. 6 (B), the protrusion 24a is in complete contact with the inner peripheral surface of the slit 35. In the case of this fixing mode, rotation resistance is improved and pulling force resistance is improved.

6 (c) and 6 (d), like FIG. 6 (a) and 6 (b), the projecting portion 24a that has bite into the slit 35.
With the rolling portion 24b that engages with the inner surface of the peripheral edge of the sleeve bottom portion 32
Is the case where the end portion 24 is formed by rolling deformation. By forming the rolling portion 24b in this way, the pulling resistance is further improved.

The manner in which the socket 20 and the sleeve 30 are fixed to each other is not limited to the above-described example, and other modifications and changes such as forming the rolling portion 24b only on the peripheral edge of the slit 35 are possible.

A flexible hose is inserted into the gap between the nipple 21 and the sleeve 30, and the sleeve 30 is press-deformed and caulked to integrally connect and hold the sleeve 30. Same as hose connection fittings.

Next, a method for manufacturing the hose connection joint having the above structure will be described.

First, the socket 20 is formed into a predetermined shape by cutting, and the sleeve 30 is formed by plastic working.

Next, as shown in FIG. 7, the connecting portion 22 of the socket 20 is fixed, the nipple 21 is inserted into the assembling hole 33 of the sleeve 30, the step portion 24 is fitted into the assembling hole 33, and the bottom portion 32 is The rear end wall of the connecting portion 22 is brought into contact with the rear end wall.

Next, as shown in FIG. 8, the rear end portion is fixed to the holder 42, and the front end pressing portion 47a is inserted into the gap 45 between the nipple 21 and the sleeve 30, and as shown in FIGS. 9 (a) and 9 (b). The punch member 43 shown is brought into contact with the step portion 24 and pressed toward the split chuck 40 that holds the socket. By this pressing, the stepped portion 24 is deformed by rolling, and a protruding portion 24a that bites is formed in the slit 35.

In order to facilitate the formation of the protruding portion 24a that bites into the slit 35, the tip pressing portion 47a of the punch member 43 is aligned with the position of the slit 35 as shown in FIGS. 9 (a) and 9 (b). The convex portion 46 is provided at the phase position. When the protrusion dimension of the convex portion 46 is Z, when Z> X-Y, the convex portion 46 contacts the stepped portion 24 at the position of the slit 35 as shown in FIGS. 6 (a) and 6 (b). A protrusion 24a is formed that is in contact with the slit 35 and bites into the slit 35. When Z <XY, as shown in FIGS. 6C and 6D, the step portion 24 is pressed by the front surface of the pressing portion 47a together with the convex portion 46. Sleeve 3 together with part 24a
A rolling part (24b) that engages with the inner surface of the peripheral edge of the bottom part (32) of 0 is formed. Further, when the width W of the convex portion 46 is formed larger than the width of the slit 35, only the peripheral edge of the slit 35 is concentrated and rolled and deformed to form the protruding portion 24a and the rolling portion 24b into the slit 35. To be done.

As described above, when the rolled portion 24b is formed, the pulling resistance in the axial direction is further improved.

Further, as shown in FIG. 10, a convex portion is formed on the tip surface of the punch member 43.
The step portion 2 is formed by the pressing portion 47b which is a smooth surface without providing 46.
4 is pressed to cause deformation by rolling, and the protrusion 24a in the slit 35 is
A rolling portion 24b that engages with the inner surface of the peripheral edge of the bottom portion 32 may be formed.

When the punch member 43 is pressed, the position of the convex portion 46 is aligned with the notch 36 formed in the end surface of the sleeve 30, so that the position of the slit 35 can be reliably aligned.

(Effects of the Invention) Since the present invention is configured as described above, the following effects are achieved.

By rolling and deforming the socket step, a protrusion is provided in the slit formed on the inner peripheral surface of the bottom of the sleeve, so that the socket and sleeve are firmly fixed, and rotation and axial removal of the sleeve are ensured. To be prevented. Therefore, brazing is unnecessary, and assembly after plating is possible, and post-processing by plating finish is unnecessary. Further, by providing a rolling portion that engages with the inner surface of the peripheral edge of the sleeve bottom portion, it is possible to further improve the anti-withdrawal force in the axial direction. Therefore, a high working pressure can be obtained, and even if the elastic force of the hose is slightly decreased due to temperature rise or deterioration, the fixing force does not decrease, and a long-life and highly reliable hose connection joint can be obtained. it can.

Furthermore, by adopting the above-mentioned manufacturing method as the method for manufacturing the hose connection joint having the protrusion in the slit, the assembly work can be performed extremely easily, and the productivity is improved and the cost is reduced. You can

[Brief description of drawings]

1 is a sectional view of a connection joint, FIG. 2 is a sectional view of a socket, FIG. 3 is a side view of a sleeve, FIG. 4 is a sectional view of the same sleeve, and FIG. 5 is an enlarged sectional view of an essential part in FIG. Figure,
6 (a) to 6 (d) are enlarged cross-sectional views of the upper half showing the manner of fixing the socket and the sleeve, FIGS. 7 and 8 are cross-sectional views showing the manufacturing process of the hose connecting joint, and FIG. (A) is a perspective view of the tip of the punch member, FIG. 9 (b) is a side view of the same, FIG. 10 is a side view of the punch member in another embodiment having a smooth tip surface, and FIGS. 11 and 12 are hoses. It is sectional drawing which shows the conventional connection joint which connected. 20 is a socket, 21 is a nipple, 22 is a connection part, 24 is a step part,
24a is a protruding portion, 24b is a rolling portion, 30 is a sleeve, 31 is a tubular body,
32 is a bottom part, 33 is an assembly hole, 34 is an inner peripheral surface, 35 is a slit, 36
Is a notch, 40 is a split chuck, 41 is a press-fit punch, 43 is a punch member, 46 is a convex portion, 47a and 47b are pressing portions.

(72) Inventor Takehiro Ishiura 5-33-8 Shiba, Minato-ku, Tokyo Within Mitsubishi Motors Corporation (72) Inventor Yuji Shiki No. 1 Nobezawa, Kaisei-cho, Ashigarakami-gun, Kanagawa Meiji Rubber Kasei Kanagawa Co., Ltd. In the factory (72) Inventor Hiroshi Hibiya 2-1027 Omiyacho, Mishima City, Shizuoka Prefecture (56) References JP-A-60-260794 (JP, A) JP-A-62-113994 (JP, A) Sho 63-53992 (JP, U) Actually opened Sho 57-30486 (JP, U)

Claims (4)

[Claims] 1. A sleeve (30) having a socket (20) having a nipple (21) and a connecting portion (22), and an assembling hole (33) formed in a bottom portion (32) for inserting the nipple (21). In the hose connection joint consisting of, a step portion (24) having a width dimension larger than the wall thickness dimension of the sleeve bottom portion (32) is provided between the nipple (21) and the connection portion (22) of the socket (20). On the other hand, a slit (35) is formed on the inner peripheral surface (34) of the bottom of the sleeve (30), and the step (24) is fitted into the assembly hole (33) of the sleeve (30). A hose characterized in that the socket (20) and the sleeve (30) are fixed by inserting a protrusion (24a) formed by rolling and deforming the step (24) into the slit (35). Connection fittings. 2. The hose connection joint according to claim 1, wherein a rolling portion (24b) which engages with an inner peripheral surface of the bottom portion (32) is formed together with the protruding portion (24a). 3. A socket (20) having a step (24) between a nipple (21) and a connecting portion (22), and an assembling hole (33) for inserting the nipple (21) into a bottom (32). ) Is formed to form a sleeve (30) having a slit (35) on the inner peripheral surface of the assembling hole (33), and the nipple (21) is provided from the assembling hole (33) to the sleeve (30). The stepped portion (24) of the socket (20) is fitted into the assembling hole (33) by inserting the protrusion (46) at the same phase position as the slit (35). Pressing part (47a) of the punch member (43) protruding
Is inserted into the space between the nipple (21) and the sleeve (30), and the punch (43) is pressed while the socket (20) is held by the split mold chuck to press the punch (43).
A method for manufacturing a hose connection joint, characterized in that the socket (20) and the sleeve (30) are integrally fixed to each other by rolling and deforming to form a protrusion (24a) in the slit (35). 4. The pressing dimension in which the protruding dimension of the convex portion (46) is smaller than the dimension difference between the stepped portion (24) and the wall thickness of the bottom portion (32) of the sleeve (30), or the tip surface is smooth. By pressing the punch member having the portion (47b), the protrusion (24a) is formed in the slit (35) and the rolling portion (24b) that engages with the inner peripheral surface of the bottom portion (32) is formed. The method for manufacturing a hose connection joint according to claim 3, wherein