JPH06159560A - High pressure rubber hose - Google Patents

Abstract

PURPOSE:To prevent early breakdown of a wire so as to prevent early breakdown of a high pressure rubber hose, enhance durability of the high pressure rubber hose, realize weight reduction, and improve flexibility. CONSTITUTION:A pair of reinforcing layers 8a, 8b are each constituted of an aromatic polyamide fiber cord X spirally wound on an inner rubber layer 2, and a wire Y wound contrarily to the winding direction of the aromatic polyamide fiber cord X on the aromatic polyamide fiber cord X via an intermediate rubber layer 4. The plurality of reinforcing layers 8a, 8b are laminated between the inner rubber layer 2 and the outer rubber layer 7.

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 having a reinforcing layer wound in a spiral shape, and more particularly to a high-pressure rubber hose which prevents the reinforcing layer from prematurely breaking and improves the durability of the hose. Is.

[0002]

2. Description of the Related Art Conventionally, as a hose for transporting a high-pressure fluid or the like, a high-pressure rubber hose is known in which at least one reinforcing layer is interposed between an inner rubber layer and an outer rubber layer with an intermediate rubber layer interposed therebetween. ing. By the way, as the reinforcing layer of the high-pressure rubber hose as described above, those having a braid (blade) structure in which wires are braided, those having a spiral structure in which wires are spirally wound, and those having a reinforcing layer in which fibers are braided, etc. Is common.

The above-mentioned spiral reinforcing layer is intended to prevent the crossed wire, which is a drawback of the blade structure, from rubbing due to repeated pressure deformation to cause fatigue and breakage. 5 and 6
As shown in FIG. 3, a wire 5 is spirally wound around the inner rubber layer 2 through a yarn braid layer or a cloth layer 3 and an intermediate rubber layer 4 in a certain direction at a constant angle, and the intermediate rubber layer is formed thereon. Wires 5 are wound via 4 to be laminated in such a manner that the respective layers are alternately oriented in opposite directions. Reference numeral 7 indicates an outer rubber layer. Therefore, the crossed wires 5
There is no breakage due to friction, the wire strength is effectively utilized, and the life is extended.

[0004]

However, the high-pressure rubber hose having the reinforcing layer 6 in which the wire 5 is spirally wound has the following problems. (A). The intermediate rubber layer 4 is inserted between the reinforcing layers 6 to prevent the wires 5 from coming into contact with each other, but sometimes the wires 5 overlap and cross each other as shown in FIG.
Contact with the wire 5 of the adjacent other layer, wire fatigue occurs at an early stage with that part as a core, and the wire 5 breaks,
High pressure rubber hose is damaged. (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.

Further, in the case of the above fiber braid reinforcement, since the yarns other than the aromatic polyamide fiber have a low tensile strength, a high breaking pressure unlike the wire braid does not appear, and the reinforcement obtained by braiding only the aromatic polyamide fiber. In the case of the layer, the breaking pressure is equivalent to that of the wire braid, but there is a problem that the mouth metal fitting is easily removed during use, performance is unstable, and practical application is difficult.

The present invention has been devised in view of such conventional problems. In a high-pressure rubber hose having a reinforcing layer wound in a spiral shape, the wire is prevented from prematurely breaking and the high-pressure rubber hose is prematurely broken. Can be prevented, the durability of the high-pressure rubber hose can be improved, and the lightweight and flexibility can be improved.
An object of the present invention is to provide a high-pressure rubber hose capable of effectively preventing the fitting from coming off.

[0007]

In order to achieve the above object, the present invention provides an aromatic polyamide fiber cord wound spirally on an inner rubber layer and an intermediate rubber layer on the aromatic polyamide fiber cord. , A pair of reinforcing layers is constituted by a wire wound in a direction opposite to the winding direction of the aromatic polyamide fiber cord, and the pair of reinforcing layers is provided between the inner surface rubber layer and the outer surface rubber layer. The gist of the invention is to stack a plurality of layers.

The spiral construction angle of the aromatic polyamide fiber cords of the pair of reinforcing layers is set to the same angle as the spiral construction angle of the wire, and preferably set to a larger angle.

[0009]

The present invention is constructed as described above, and the aromatic polyamide fiber cord is spirally wound around the inner rubber layer, and the aromatic rubber fiber cord is covered with the intermediate rubber layer to form the aromatic compound. By winding a wire in a direction opposite to the winding direction of the group polyamide fiber cord to form a pair of reinforcing layers, and by forming a plurality of layers of the pair of reinforcing layers between the inner rubber layer and the outer rubber layer, for example, Even if there are overlapping wires, the adjacent reinforcing layer is an aromatic polyamide fiber cord, so by not contacting the wires of other layers, it is possible to prevent early labor of the wires and prevent early breakage of the high pressure rubber hose. In addition, by using a wire as the outermost reinforcing layer, it is easy to prevent slipping of the mouth fittings, the durability of the high pressure rubber hose can be improved, and it is lightweight. One flexibility can be improved,
It is possible to effectively prevent the metal fittings from coming off.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted. FIG. 1 is a partially cutaway perspective view of a high-pressure rubber hose 1 embodying the present invention,
Reference numeral 2 indicates an inner rubber layer, and 7 indicates an outer rubber layer. An aromatic polyamide fiber cord X is spirally wound between the inner rubber layer 2 and the outer rubber layer 7 with an intermediate rubber layer 4 sandwiched therebetween. The reinforcing layer 8a and the reinforcing layer 8b in which the wire Y is spirally wound in a direction opposite to the winding direction of the aromatic polyamide fiber cord X are laminated and configured.

In the embodiment of the present invention, the aromatic polyamide fiber cord X wound spirally on the inner rubber layer 2 is used.
And a wire Y wound on the aromatic polyamide fiber cord X in the direction opposite to the winding direction of the aromatic polyamide fiber cord X via the intermediate rubber layer 4 to form a pair of reinforcing layers 8a. . Such a pair of reinforcing layers 8a
A plurality of layers are formed between the inner rubber layer 2 and the outer rubber layer 7, and the outermost reinforcing layer 8b is composed of the wire Y from the viewpoint of preventing the high-pressure rubber hose 1 from coming off from the fitting.

Further, in the above embodiment, the pair of reinforcing layers 8
Although a is composed of two layers, it is not limited to the above-mentioned embodiment,
A plurality of pairs of reinforcing layers may be formed. In addition, an intermediate rubber layer 5 is interposed between the respective pairs, and the respective layers are adhered by an adhesive. The spiral construction angle of the aromatic polyamide fiber cords of the pair of reinforcing layers is set to the same angle as the spiral construction angle of the wire, and preferably set to a larger angle.

The reason for this is that the relation between the elongation of the wire Y and the cutting load of the aromatic polyamide fiber cord X is
As shown in FIG. 4, the aromatic polyamide fiber cord X is more easily stretched under the same load, and the angles of the reinforcing layers 8a and 8b change to a static angle (54 ° 44 ′) by the pressurization.
In the embodiment of the present invention, since the aromatic polyamide fiber cord X is wound in one direction and the wire Y is wound in the other direction, the high-pressure rubber hose 1 is twisted in the winding direction of the aromatic polyamide fiber cord X which is easily stretched by pressure. It will be.

For example, as shown in FIG. 3, an aromatic polyamide fiber cord X constructed at an angle α _A changes to an angle α _O by pressure and balances (becomes a substantially stationary angle). At that time, point A is point A ₁ if only the angle change, but point A ₂ because the aromatic polyamide fiber cord X extends.
Now, in order to balance the point A at the point A ₁ by pressurization, considering the elongation of the aromatic polyamide fiber cord X, only the change in the angle becomes the point B ₁ . If this is returned to the non-pressurized state, B
Becomes a point, and the angle at that point becomes α _B. That is, if the angle of the wire Y having a small elongation is α _A , the aromatic polyamide fiber cord X having a large elongation will be out of balance unless it is α _B, and the high-pressure rubber hose 1 will be twisted. To correct this, wire Y from the beginning
By twisting the aromatic polyamide fiber cord X at a larger angle, twisting of the high-pressure rubber hose 1 is prevented.

Next, Table 1 and Table 2 below show the results of an experiment in which the high-pressure rubber hose 1 having the above-mentioned structure was compared with a conventional product. As a result of changing the material and construction angle of the reinforcing layer from the first to the fourth with the hose inner diameter and the hose outer diameter being the same, as shown in Table-2, as compared with the conventional product, impulse resistance, bending resistance It was found that the strength, the twist ratio of the hose when pressurized, and the hose weight were excellent.

[0016]

[0017]

As described above, the pair of reinforcing layers 8a, 8b
By a wire Y wound on the aromatic polyamide fiber cord X via the intermediate rubber layer 4 in a direction opposite to the winding direction of the aromatic polyamide fiber cord X,
As shown in FIG. 2, since the aromatic polyamide fiber cords X in the adjacent layers are compressed and deformed even if the wires Y overlap with each other, the early fatigue of the wires Y can be effectively prevented and the early breakage of the high-pressure rubber hose can be effectively prevented. It can be done.

[0019]

As described above, according to the present invention, the aromatic polyamide fiber cord wound spirally on the inner rubber layer as described above, and the aromatic polyamide fiber cord via the intermediate rubber layer on the aromatic polyamide fiber cord. A pair of reinforcing layers is formed by a wire wound in a direction opposite to the winding direction of the cord, and the reinforcing layer is formed by laminating a plurality of the pair of reinforcing layers between an inner rubber layer and an outer rubber layer. In addition, since the outermost reinforcing layer is made of wire, it is possible to prevent the metal fittings of the wire from coming off, prevent early destruction of the high-pressure rubber hose, improve the durability of the high-pressure rubber hose, and reduce the weight. In addition, the flexibility can be improved, and there is an effect that the slip-out of the mouth fitting can be effectively prevented.

[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 an explanatory view showing a state in which cords of a reinforcing layer of the present invention are overlapped or intersect with each other.

FIG. 3 is an explanatory diagram showing a change state of a construction angle between an aromatic polyamide fiber cord and a wire.

FIG. 4 is an explanatory graph showing the relationship between the cutting load and the elongation between the aromatic polyamide fiber cord and the wire.

FIG. 5 is a partially cutaway perspective view of a conventional high-pressure rubber hose.

FIG. 6 is an explanatory diagram showing a state in which cords of a conventional reinforcing layer are overlapped or intersect with each other.

[Explanation of symbols]

 1 High-pressure rubber hose 2 Inner rubber layer 4 Intermediate rubber layer 7 Outer rubber layer 8a, 8b Reinforcing layer X Aromatic polyamide fiber cord Y Wire

Claims (2)

[Claims] 1. A high-pressure rubber hose in which a reinforcing layer is spirally wound with an intermediate rubber layer sandwiched between an inner rubber layer and an outer rubber layer, wherein an aromatic substance wound spirally on the inner rubber layer. A polyamide fiber cord and a wire wound in a direction opposite to the winding direction of the aromatic polyamide fiber cord through an intermediate rubber layer on the aromatic polyamide fiber cord form a pair of reinforcing layers, and the reinforcing layer is formed. A high-pressure rubber hose characterized in that a plurality of the pair of reinforcing layers are laminated between the inner rubber layer and the outer rubber layer, and the outermost reinforcing layer is a wire. 2. The high-pressure rubber hose according to claim 1, wherein the spiral construction angle of the aromatic polyamide fiber cords of the pair of reinforcing layers is set to the same angle as the spiral construction angle of the wire, and preferably to a larger angle.