JPH04337187A - Fitting structure for hose and coupling - Google Patents

Abstract

PURPOSE:To provide fitting structure for a hose and a coupling which ensures sealing ability between the coupling and the hose and improves durability. CONSTITUTION:A flexible hose 8 is inserted in an annular space formed between a nipple 1 serving as a coupling and a sleeve 11 positioned on the outer peripheral part of the nipple 1 and serving as a coupling in a similar manner described above. The sleeve 11 is caulked to the nipple 1 and a bent part 12 of the end part of the sleeve 11 is engaged internally of a seal groove 4 formed by using a flange part 5 of the base end part of the nipple 1 and an annular protrusion 6 located nearer the tip side than the flange part. A rubber piece 9a expanded from the flexible hose 8 is nipped between the bent part 12 and the annular protrusion 6 and a film layer 10 formed of a sticking preventing agent to prevent sticking therebetween is located between the outer peripheral part of the nipple 1 and the inner peripheral part of the flexible hose 8.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting hoses and joints used, for example, in fuel piping, hydraulic piping, etc. of automobiles.

0002

2. Description of the Related Art Conventionally, the following structures are known as mounting structures for hoses and couplings. That is, as shown in FIGS. 4 and 5, the end of the rubber hose 23 is fitted into the outer circumference of the nipple 21, which has a plurality of annular grooves 22. A joint is attached to the end of the rubber hose 23 by crimping the sleeve 24 over the outer periphery of the rubber hose 23 to form a crimped portion 25 . In addition, as shown in FIG.
They are formed at multiple locations on the outer periphery of No. 3 at equal intervals. Sealing performance between the outer circumferential surface of the nipple 21 and the inner circumferential surface of the rubber hose 23 is ensured by the surface pressure caused by this caulking.

However, if the rubber hose 23 deteriorates over time, it will no longer be possible to maintain a surface pressure above a certain level, and sufficient sealing performance between the outer periphery of the nipple 21 and the inner periphery of the rubber hose 23 will no longer be ensured.

0004

SUMMARY OF THE INVENTION Therefore, the following structure having a so-called self-sealing mechanism can be considered. That is, as shown in FIG. 6, in addition to the annular groove 22 of the nipple 21 shown in FIG.
7 provides an annular sealing groove 26. The bent portion 24a of the sleeve 24 is inserted into the seal groove 26, and the rubber piece 28 of the rubber hose 23 is bulged out in the gap between the bent portion 24a and the annular protrusion 27 of the nipple 21.

During use, the nipple 21 is pushed to the left in the figure by the pressure of the fluid inside the rubber hose 23.
The rubber hose 23 and the sleeve 24 move relatively to the right side together, and the rubber piece 28 of the rubber hose 23 is sandwiched between the bent part 24a of the sleeve 24 and the annular protrusion 27, resulting in a seal, so-called self-sealing property. is exhibited and the sealing performance is improved.

However, in the structure having a self-sealing mechanism as shown in FIG. This means that it is crimped across the entire length. Therefore, the rubber hose 23 may stick to the nipple 21, and the rubber piece 28 in the seal groove 26 may also stick to the seal groove 26.

As a result, even if the nipple 21 is pushed to the left by the pressure of the fluid in the rubber hose 23, the rubber piece 28 is fixed to the seal groove 26 as described above, and the nipple 2
Since the sleeve 24 does not move relative to the nipple 21, the rubber piece 2 in the seal groove 26
8 does not come into close contact with the annular projection 27 of the nipple 21. Therefore, there is a problem in that the sealing performance between the outer circumferential surface of the nipple 21 and the inner circumferential surface of the rubber hose 23 may not be sufficiently ensured.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a hose-to-coupling mounting structure that ensures sufficient sealing between the joint and the hose and has good durability. It's about doing.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a flexible structure in an annular space formed between a nipple that constitutes a joint and a sleeve that also constitutes a joint, located on the outer periphery of the nipple. The hose is inserted and the sleeve is caulked against the nipple, and the sleeve is inserted into the sealing groove formed by the flange provided at the proximal end of the nipple and the annular protrusion distal to the flange. A hose and joint attachment structure in which a bent portion at an end is fitted and a rubber piece of the flexible hose bulges in a gap formed between the bent portion and the annular protrusion, Between the outer circumference of the nipple and the inner circumference of the flexible hose,
The gist of this invention is an attachment structure for a hose and a joint, which is characterized by a thin film layer of an anti-sticking agent interposed therebetween to prevent the two from sticking together.

0010

[Operation] A thin film layer of anti-sticking agent is interposed between the outer circumference of the nipple and the inner circumference of the flexible hose, so the nipple and flexible hose will not stick together during use. do not have. Therefore, during use, the rubber piece of the flexible hose that bulges into the seal groove is caught between the bent part of the sleeve and the annular protrusion of the nipple, creating a good gap between the nipple and the flexible hose. Sealing performance is maintained over a long period of time.

[0011]

[Embodiments] Examples embodying the present invention will be described below with reference to FIGS. 1 to 3. As shown in FIG. 1, a plurality of annular grooves are formed on the outer periphery of a nipple 1, which has a flow hole 2 through which fluid such as oil flows. That is,
Three annular grooves 3 are provided in the center, and an annular seal groove 4 is provided on the base end side (left side in the figure). The proximal end side of the seal groove 4 is a flange portion 5, and the distal side thereof is an annular projection 6, and the seal groove 4 is formed by the flange portion 5 and the annular projection 6. Further, the tip of the nipple 1 is provided with a tapered portion 7 whose diameter decreases toward the tip.

The outer periphery of the nipple 1 is fitted into the end of a rubber hose 8. The inner circumference of the rubber hose 8 is fitted into the annular groove 3 and the seal groove 4 on the outer circumference of the nipple 1, forming protruding rubber pieces 9a and 9b. Between the inner peripheral surface of the rubber hose 8 and the outer peripheral surface of the nipple 1, a thin film layer 1 of water-soluble silicone as an anti-sticking agent is provided.
0 and is interposed. The water-soluble silicone was manufactured by Toray Industries, Inc. under the trade name SH7037, and a 10% by weight aqueous solution thereof was used.

A cylindrical sleeve 11 is fitted around the outer periphery of the rubber hose 8, and its proximal end forms a bent portion 12 that is bent inward.
It is fitted into the seal groove 4 of the pulley 1. The rubber piece 9a of the rubber hose 8 is held between the bent portion 12 and the annular projection 6 of the nipple 1. The sleeve 11 has a caulked portion 13 at its center. This caulking allows the rubber hose 8 to come into close contact with the nipple 1.

Next, the water-soluble silicone thin film layer 10
The formation method will be explained. As shown in FIG. 2, water-soluble silicone is first applied from the tip of the nipple 1 to approximately the center of the nipple 1. Next, this nipple 1
The cylindrical sleeve 11 before being caulked from its tip side.
Insert. At this time, the bent portion 12 of the sleeve 11 is 6
Since it is inclined at about 0 degrees, it can be easily fitted. Note that the sleeve 11 may be fitted onto the outer periphery of the nipple 1 before applying this water-soluble silicone.

In this state, the rubber hose 8 is inserted into the outer periphery of the nipple 1 from the distal end thereof. At this time, nipple 1
The tip of the rubber hose 8 has a tapered part 7.
can be easily inserted into the outer periphery of the nipple 1. Then, as the rubber hose 8 is inserted into the outer circumference of the nipple 1, as the rubber hose 8 moves, the water-soluble silicone applied to the outer circumference of the tip of the nipple 1 spreads toward the base end of the outer circumference of the nipple. go.

Next, as shown in FIG. 3, the rubber hose 8
When the water-soluble silicone reaches the base end of the nipple 1, the water-soluble silicone also reaches the base end of the outer periphery of the nipple 1, and a thin film layer 10 of water-soluble silicone is formed over the entire outer periphery of the nipple 1. Note that the state shown in FIG. 1 is obtained by caulking the sleeve 11 thereafter. Next, the operation of the mounting structure between the joint and the rubber hose 8 of this embodiment when used will be explained. As shown in FIG. 1, during use, the nipple 1 is pressed to the left by the pressure of the fluid flowing inside the rubber hose 8 to the left in the figure, so that the rubber hose 8 and the sleeve 11 are relatively integrated and moved to the right. As a result, the rubber piece 9a in the seal groove 4 is caught between the bent portion 12 of the sleeve 11 and the annular projection 6 of the nipple 1. As a result, the rubber piece 9 in the seal groove 4 comes into close contact with the annular protrusion 6 of the nipple 1, exhibiting self-sealing properties.

As described above, since the thin film layer 10 of water-soluble silicone is formed between the outer circumferential surface of the nipple 1 and the inner circumferential surface of the rubber hose 8, the outer circumferential surface of the nipple 1 and the inner circumferential surface of the rubber hose 8 are Sticking between the surface and the surface is prevented. Therefore,
The above-mentioned self-sealing property is continuously exhibited in a good condition. As a result, the rubber hose 8 can be used for a long period of time with its sealing performance maintained even under conditions of use where it is exposed to high temperatures, and its durability is improved.

Next, in order to confirm the sealing performance of this example, the following test was conducted. Test method: A rubber hose 8 is attached to the outer circumference of the nipple 1, and a sleeve 11 is attached and caulked to the outer circumference of the rubber hose 8.
The rubber hose 8 was forcibly aged by being left for 100 hours and 250 hours. Next, put 20 kg into the rubber hose 8.
The sealing property was determined by applying a pressure of /cm2 for 5 hours and measuring the decrease in pressure at that time.

Test objects: Tests were conducted on the test material of this example and the conventional test material having self-sealing properties. Judgment criteria:○
indicates that the sealing performance was good. △ indicates that the sealing performance was slightly poor. × indicates that the sealing performance was poor. The test results are shown in Table 1 below.

[0020]

[Table 1] As can be seen from Table 1, in this example, 100
The sealing performance is good not only after 250 hours but also after 250 hours. On the other hand, it can be seen that in the conventional one shown in the comparative example, the sealing performance begins to deteriorate after 100 hours, and the sealing performance deteriorates after 250 hours.

The present invention is not limited to the above embodiments, and for example, silicone grease, waxes, lubricating oil, etc. may be used as the anti-sticking agent for forming the thin film layer 10.

[0022]

According to the present invention, the sealing performance between the joint and the hose is sufficiently ensured, and durability is improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, and is a sectional view showing a state in which a rubber hose is attached to a nipple and a sleeve is attached and caulked to the outer circumference of the rubber hose.

FIG. 2 is a sectional view showing a state in which a rubber hose is inserted into a nipple coated with silicone oil.

FIG. 3 is a cross-sectional view showing a state in which the rubber hose is inserted into the outer circumference of the nipple from the state shown in FIG. 2;

FIG. 4 is a cross-sectional view showing a conventional example in which a rubber hose is attached to the nipple and a sleeve is attached and caulked to the outer periphery of the rubber hose.

FIG. 5 is a sectional view taken along line AA in FIG. 4;

FIG. 6 is a cross-sectional view showing another conventional example in which a rubber hose is attached to the nipple, and a sleeve is attached and caulked to the outer periphery of the rubber hose.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Nipple as a joint, 4... Seal groove, 5... Flange portion, 6... Annular projection, 8... Rubber hose as a flexible hose, 9a... Rubber piece, 10... Thin film layer, 11... Sleeve as a coupling, 12 ...Bending part.

Claims (1)

[Claims] Claim 1: A nipple (1) constituting a joint and a sleeve (11) located on the outer periphery of the nipple (11) constituting a joint.
) A flexible hose (8) is inserted into the annular space formed between the sleeve (11), the sleeve (11) is caulked to the nipple (1), and a A seal groove (
4) The bent part (12) at the end of the sleeve (11) is fitted into the sleeve, and the flexible hose is inserted into the gap formed between the bent part (12) and the annular projection (6). (8) A mounting structure of the hose (8) and the joint (1, 11) in which the rubber piece (9a) is bulged, and the outer circumference of the nipple (1) and the inner circumference of the flexible hose (8). A mounting structure for a hose and a coupling, characterized in that a thin film layer (10) made of an anti-sticking agent is interposed between the two parts to prevent sticking between the two.