JP3125119B2 - High pressure rubber hose - Google Patents

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 having improved durability by preventing early destruction of a reinforcing layer.

[0002]

2. Description of the Related Art A conventional high pressure rubber hose is shown in FIGS.
As shown in the figure, between the inner rubber layer 1 and the outer rubber layer 2,
A reinforcing layer having one or more reinforcing layers 4 with an intermediate rubber layer 3 interposed therebetween. The reinforcing layer has a braided structure in which a wire is braided, a spiral structure in which a wire is spirally wound, and a reinforcing layer in which fibers are braided. And the like are common. Reference numeral 5 denotes a yarn braided layer or a cloth layer.

[0003] The reinforcing layer 4 having the spiral structure described above has a structure shown in FIG.
As shown in the figure, fatigue due to friction between the crossed wires due to repeated pressure deformation, which is a disadvantage of the blade structure,
A structure designed to prevent breakage, and the reinforcing layer 4
Has a structure in which a wire 6 is spirally wound in one direction at a fixed angle with an intermediate rubber layer 3 interposed therebetween, and the spiral layers are alternately wound and laminated so as to face in opposite directions. Therefore, there is no fatigue or breakage due to friction of the intersecting wires 6, and the life is prolonged.

[0004]

However, the high-pressure rubber hose having the reinforcing layer 4 having the spiral structure formed by the wires 6 has the following problems. (A). The intermediate rubber 3 is inserted between the spiral layers to prevent the wires 6 from coming into contact with each other.
As shown in the section, the wires 6 are overlapped due to the disorder of the arrangement of the wires 6, and the wires 6 come into contact with the adjacent wires 6 of the other layers, and the wires 6 are fatigued, broken, and the hose is broken at the early stage with the portion as a nucleus. . (B). Since the wire 6 is used as the reinforcing layer 4, the weight of the entire hose increases, and handling is inconvenient. (C). Since the wire 6 is used as the reinforcing layer 4, it is hard to bend and lacks flexibility as a hose.

[0005] In the case of a reinforcing layer in which only aromatic polyamide fibers are braided by fiber braid reinforcement, a hose burst pressure equivalent to that of a wire braid can be obtained, but the fitting is easily pulled out during use, resulting in poor performance. There was a problem that it was stable and difficult to put into practical use. The applicant of the present invention has applied for the invention of a high-pressure hose using a wire and a fiber cord for the reinforcing layer 4 having a spiral structure (Japanese Patent Publication No. 59-49465). In the case that the gas is released from the fiber cord portion of the reinforcing layer,
It is concerned with air permeability, and is not intended to prevent hose fatigue or early fatigue or breakage due to contact between wires.

[0006] The present invention has been devised in view of such a conventional problem, and it is possible to prevent early fatigue and breakage of a wire and improve the durability of a hose.
It is an object of the present invention to provide a high-pressure rubber hose that is lightweight, can improve flexibility, and can effectively prevent the fitting from coming off.

[0007]

In order to achieve the above object, the present invention provides a high-pressure rubber hose in which a reinforcing layer is spirally wound, wherein the reinforcing layer comprises a wire and an aromatic polyamide fiber and is adjacent to the wire. The point is that the portion to be formed is an aromatic polyamide fiber and is spirally wound.

[0008]

According to the present invention, the reinforcing layer is composed of a wire and an aromatic polyamide fiber, so that the disorder of the wire arrangement is absorbed by the cross-sectional deformation of the adjacent aromatic polyamide fiber. Prevents the occurrence of overlap, and the aromatic polyamide fiber on both sides of the wire prevents wires from directly contacting each other even in the same layer, preventing early wire fatigue and preventing early breakage of the high-pressure rubber hose. In addition, by configuring the reinforcing layer with a wire and an aromatic polyamide fiber, it is easy to prevent the fitting from coming off, and the durability of the high-pressure rubber hose can be improved, and the weight and flexibility are improved. You can do it.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted. FIG. 1 is a partially cutaway perspective view of a high-pressure rubber hose embodying the present invention, and FIG. 2 is an enlarged sectional view of a main part of FIG. 1. The high-pressure rubber hose has a yarn braided layer or cloth on an inner rubber layer 1. A layer 5 is provided, and one or more reinforcing layers 4 are provided on the upper surface thereof with a reinforcing layer 4 having a spiral structure and an intermediate rubber layer 3 interposed therebetween, and are covered with an outer rubber layer 2.

The reinforcing layer 4 is formed by arranging the wires 6 and the aromatic polyamide fibers 7 alternately and winding them in a spiral shape, and then interposing the wires 6 and the aromatic polyamide fibers 7 on the intermediate rubber layer 3. It is arranged every other book and wound up so that each layer faces in the opposite direction alternately, and a plurality of layers are laminated.
Note that the wires 6 and the aromatic polyamide fibers 7 that constitute the reinforcing layer 4 are not limited to the case where the wires 6 and the aromatic polyamide fibers 7 are arranged alternately as described above, and the aromatic polyamide fibers 7 are arranged adjacent to the wires 6. In the case of a configuration, a configuration in which a plurality of aromatic polyamide fibers 7 are arranged next to the wire 6 and one wire 6 is further arranged may be employed.

As described above, the reinforcing layer 4 is composed of the wire 6 and the aromatic polyamide fiber 7,
The disorder of the arrangement of the wires 6 can be absorbed by the cross-sectional deformation of the aromatic polyamide fibers 7 adjacent to each other, thereby preventing the overlapping of the wires 6 from each other. Since the wires 6 do not directly contact each other even within one layer, early fatigue of the wires 6 can be prevented, and early breakage of the high-pressure rubber hose can be prevented.

Further, by forming the reinforcing layer with the wire 6 and the aromatic polyamide fiber 7, the fitting can be held firmly, and thus the fitting can be easily prevented from coming off, and the durability of the high-pressure rubber hose can be improved. At the same time, the structure of the reinforcing layer 4 can be reduced in weight and improved in flexibility as compared with the case where the reinforcing layer 4 is constituted only by the wires 6.

[0013]

According to the present invention, there is provided a high-pressure rubber hose in which a reinforcing layer is spirally wound as described above, wherein the reinforcing layer comprises a wire and an aromatic polyamide fiber, and a portion adjacent to the wire is an aromatic polyamide. Since it is arranged so as to be a fiber and wound in a spiral shape, the following excellent effects can be obtained. (A). The disorder of the wire arrangement is absorbed by the shape deformation of the aromatic polyamide fiber placed next to the wire, preventing the wires from overlapping, and since the wires do not come into direct contact within each layer, fatigue of the wires due to rubbing is reduced. This prevents premature fatigue of the wire and improves the durability of the hose. (B). It is more flexible than conventional high-pressure rubber hoses with a stiffening wire-only reinforcement layer. (C) It is lighter than a conventional high-pressure rubber hose having a reinforcing layer consisting of only heavy wires. (D). Since the aromatic polyamide fiber is used for the reinforcing layer, the air permeability is good, and even if air is mixed in the fluid in the high-pressure rubber hose, the air can escape from the fiber reinforcing layer portion to the outside.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a partially cutaway perspective view of a conventional high-pressure rubber hose.

FIG. 4 is an enlarged sectional view of a main part of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Inner rubber layer 2 Outer rubber layer 3 Intermediate rubber layer 4 Reinforcement layer 5 Yarn braided layer or cloth layer 6 Wire 7 Aromatic polyamide fiber X Overlapping part of wires

Claims (2)

(57) [Claims] 1. A high-pressure rubber hose in which a reinforcing layer is spirally wound with an intermediate rubber layer interposed between an inner rubber layer and an outer rubber layer, wherein the reinforcing layer comprises a wire and an aromatic polyamide fiber, A high-pressure rubber hose, wherein a portion adjacent to a wire is arranged to be an aromatic polyamide fiber and wound in a spiral shape. 2. The high-pressure rubber hose according to claim 1, wherein a plurality of the reinforcing layers are laminated via an intermediate rubber layer.