JPH06159558A - High pressure rubber hose - Google Patents

Abstract

PURPOSE:To reduce the number of mutual contacts between wires so as to enhance fatigue resistance of the wires and durability (lifetime) of a hose main body, and realize light weight and flexibility. CONSTITUTION:A high pressure rubber hose comprises an inner rubber layer 2, an outer rubber layer 3, and two reinforcing layers 4a, 4b braided between the inner and outer rubber layers 2, 3 with an interlayer rubber layer 5 held therebetween. The reinforcing layers 4a, 4b are of structure where wires X and aromatic polyamide fiber cords Y are alternately braided. A well known lateral type braiding machine is used for braiding the reinforcing layers 4a, 4b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure rubber hose, and more particularly to a high-pressure rubber hose in which the reinforcing layer has improved fatigue resistance and durability.

[0002]

2. Description of the Related Art Conventionally, as a hose for transporting high-pressure fluid, a high-pressure rubber hose has been known in which two or more reinforcing layers are interposed between an inner rubber layer and an outer rubber layer with an interlayer rubber layer sandwiched therebetween. ing. By the way, as a reinforcing layer of the above-mentioned high-pressure rubber hose, a braid (blade) structure in which wires are braided and a spiral structure in which wires are spirally wound are generally used.

[0003]

[Problems to be Solved by the Invention] However, in the case of a reinforcing layer having a braid structure in which wires are braided, there are the following problems. (A). Since the wires having rigidity are braided, the wires come into strong contact with each other, and repeated pressing causes the wires to come into contact with each other, and the contact portions of the wires are worn away, or the wires are easily fatigued due to bending. (B). Since a heavy wire is used as the reinforcing layer, the total weight of the high pressure rubber hose increases,
Inconvenient to handle. (C). Since a highly rigid wire is used as the reinforcing layer, it is difficult to bend and lacks flexibility as a high-pressure rubber hose.

The present invention has been devised in view of such conventional problems. It is possible to reduce the contact between wires and to improve the fatigue resistance of the wire, and also to improve the durability (life) of the hose body. The purpose of the present invention is to provide a high-pressure rubber hose which can be extended, and which is further lightweight and has improved flexibility.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the gist of the present invention is to construct a reinforcing layer by alternately arranging wires and aromatic polyamide fiber cords and braiding them. . Further, the gist of the invention is that two or more reinforcing layers are laminated with an interlayer rubber sandwiched therebetween.

[0006]

The present invention is constructed as described above, in which a wire and an aromatic polyamide fiber cord are alternately arranged on a carrier that rotates on one side of a braiding machine, and a wire on a carrier that rotates on the other side. And the aromatic polyamide fiber cords are alternately arranged to reduce the contact between the wires and improve the fatigue resistance of the wires. It is also possible to stack two or more reinforcing layers with an interlayer rubber sandwiched therebetween.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partially cutaway perspective view of a high-pressure rubber hose 1 embodying the present invention, in which 2 is an inner rubber layer, 3 is an outer rubber layer, and 4a and 4b are between an inner rubber layer 2 and an outer rubber layer 3. 2 shows two reinforcing layers knitted up with the interlayer rubber layer 5 sandwiched therebetween.

In the embodiment of the present invention, the reinforcing layers 4a,
1 to 3, a wire X and an aromatic polyamide fiber cord Y are alternately braided, and a machine for braiding the reinforcing layers 4a and 4b is a conventionally known device. Use a horizontal braiding machine. To construct the reinforcing layers 4a and 4b in which the wires X and the aromatic polyamide fiber cords Y are alternately braided as described above, a plurality of counterclockwise (rotating in one direction) carriers constituting a braiding machine not shown , The wires X and the aromatic polyamide fiber cords Y are alternately arranged, and a plurality of clockwise rotations (rotating to the other)
By alternately arranging the wire X and the aromatic polyamide fiber cord Y on the carrier and knitting them, the contact between the wires is reduced, and the fatigue resistance of the wire can be improved.

Incidentally, the construction of a conventionally known braiding machine is as follows.
Around the inner rubber tube (inner rubber layer 2), a carrier supporting a bobbin around which the wire X is wound and a carrier supporting a bobbin around the aromatic polyamide fiber cord Y are arranged at the same number and at the same intervals. By the guide groove and gear of the plate that is arranged and is perpendicular to the inner rubber tube,
One set rotates around the inner rubber tube in the opposite direction while alternately intersecting each carrier with the other set, and in conjunction with this, the inner rubber tube moves in the traveling direction.

The number of bobbins is 16, 20, 24, 32,
In the case of a braiding machine having 36, 48, etc., when performing braiding of two or more layers, an inter-layer rubber sheet having a predetermined width is automatically fed through a conical guide between the braids to surround the reinforcing layer. It has a structure that wraps around. In the example of the present invention, as shown in Example 1 of Table 1 below, for example, the diameter is 12.7 mm.
When manufacturing the high-pressure rubber hose 1, the diameter of the wire X used is 0.35 mm, the number of the wire X used is 72 for both the first layer and the second layer, and the aromatic polyamide fiber cord Y is 15
00d / 1 (denier), 72 used, total number is
144 wires X, aromatic polyamide fiber cord Y
There are 144 and 288 in total. On the other hand, in the case of the high-pressure rubber hose in which the reinforcing layer is braided using only the wire X of the conventional product 1, the diameter of the wire used is 0.35 mm, the number of wires, and the first layer and the second layer are 144 , The total number is 288.

When the high-pressure rubber hose according to the present invention is compared with the high-pressure rubber hose of the conventional product 1, as is clear from Table 2, impulse resistance, fatigue resistance (life) of the reinforcing layer, weight, flexibility (bending). It has been found that the radius is excellent. In addition, as shown in Comparative Example 1 in Table 1,
It was found that, when compared with the reinforcing layer used for the aromatic polyamide fiber alone, when the aromatic polyamide fiber was used alone, when the impulse resistance was compared, slipping of the mouth metal fitting occurred.

Further, in Table 1, in the one-layer braid,
When the conventional product 2 and Example 2 are compared, as is clear from Table 2, it is excellent in impulse resistance, fatigue resistance (life) of the reinforcing layer, weight, flexibility (bending radius), etc. I understood.

[0013]

[0014]

Further, in the embodiment of the present invention, the reinforcing layer 4
Since a and 4b have a structure in which a wire X and an aromatic polyamide fiber cord Y are braided,
Left-handed wire X and aromatic polyamide fiber cord Y
And are repeatedly crossing. And at this overlap,
As shown in FIG. 3, the braid tensions during braiding cause mutual compression loads, but when the reinforcing material is the wire X, the cross-sectional shape does not change even when subjected to a compression load. In the case of Y, the cross-sectional shape changes from a circular cross section to a flat shape due to a compressive load, and the cross-section expands in the lateral direction.

Further, as the reinforcing material (the aromatic polyamide fiber cord Y and the wire X) is braided at the crossing portion G of the braid, a compressive force is applied, so that the cross sectional shape of the aromatic polyamide fiber cord Y becomes flat. . By flattening the aromatic polyamide fiber cord Y, the reinforcing layer 4
Since the outer diameters of a and 4b are small, the bending angle α of the reinforcing material
₁ is smaller than the winding angle of the wire X. Also,
Aromatic polyamide fiber cord Y near the stitch intersection G
The wire X that is flattened and intersects differently from the wire X
Since the aromatic polyamide fiber cord Y is deformed along the bend of, the stress applied to the wire X is relaxed. As a result, the fatigue resistance of the wire X is improved.

As described above, in this embodiment, the wire X and the aromatic polyamide fiber cord Y are alternately arranged on one of the carriers rotating on the braiding machine, and the carrier rotating on the other side is also By arranging the reinforcing layers 4a and 4b in which the wires X and the aromatic polyamide fiber cords Y are alternately arranged, the contact between the wires X can be reduced and the fatigue resistance of the wires X can be improved. Is.

[0018]

As described above, according to the present invention, since the reinforcing layer is formed by alternately arranging the wires and the aromatic polyamide fiber cords and braiding them together, the mutual contact between the wires is eliminated, and the fatigue resistance of the wires is improved. And the durability (lifetime) of the high-pressure rubber hose can be extended, and the high-pressure rubber hose can be lightweight and have improved flexibility.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a high-pressure rubber hose embodying the present invention.

FIG. 2 is a partially enlarged view of a braid of a reinforcing layer wire and an aromatic polyamide fiber cord.

FIG. 3 is an explanatory view showing a braided state of a reinforcing layer wire and an aromatic polyamide fiber cord.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-pressure rubber hose 2 Inner surface rubber layer 3 Outer surface rubber layer 4a, 4b Reinforcing layer 5 Interlayer rubber layer X Wire Y Aromatic polyamide fiber cord

Claims (2)

[Claims] 1. A high-pressure rubber hose having a reinforcing layer interposed between an inner rubber layer and an outer rubber layer, wherein the reinforcing layer is braided by alternately arranging wires and aromatic polyamide fiber cords. A high-pressure rubber hose characterized by being constructed. 2. The high-pressure rubber hose according to claim 1, wherein two or more reinforcing layers are formed by sandwiching an interlayer rubber layer between the inner rubber layer and the outer rubber layer.