JP3170663B2 - 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 in which a reinforcing layer is spirally wound, and more particularly to a high-pressure rubber hose in which the reinforcing layer is prevented from being destroyed at an early stage and the durability of the hose is improved. It is.

[0002]

2. Description of the Related Art Hitherto, as a hose for transporting a high-pressure fluid or the like, a high-pressure rubber hose comprising at least one reinforcing layer with an intermediate rubber layer interposed between an inner rubber layer and an outer rubber layer is known. ing. By the way, the reinforcing layer of the high-pressure rubber hose as described above has a braid (braid) structure in which a wire is braided, a spiral structure in which a wire is spirally wound, a reinforcing layer in which a fiber is braided, and the like. Is common.

The above-mentioned reinforcing layer having the spiral structure is designed to prevent the crossed wire, which is a drawback of the blade structure, from being rubbed by repeated pressurization deformation to thereby cause fatigue and breakage. 5 and 6
As shown in FIG. 2, a wire 5 is spirally wound on the inner rubber layer 2 at a certain angle in a certain direction via a yarn braided or cloth layer 3 and an intermediate rubber layer 4, and the intermediate rubber layer is further wound thereon. A wire 5 is wound and laminated so that each layer faces alternately in the opposite direction via the wire 4. Reference numeral 7 denotes an outer rubber layer. Therefore, the crossed wires 5
The wire is not broken by friction, and the strength of the wire is utilized without waste, and the life is prolonged.

[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. However, the wires 5 sometimes overlap and cross each other as shown in FIG.
Contact with the adjacent wire 5 of the other layer, wire fatigue occurs early with that part as a nucleus, the wire 5 breaks,
High pressure rubber hose is damaged. (B). As a heavy wire is used as the reinforcing layer, the overall 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.

[0005] In the case of the above-mentioned fiber braid reinforcement, yarns other than the aromatic polyamide fiber have low tensile strength, so that a high breaking pressure unlike a wire braid does not appear, and a reinforcement obtained by braiding only an aromatic polyamide fiber. In the case of a layer, the burst pressure is equivalent to that of a wire braid, but there is a problem that the fitting is easily removed during use, the performance is unstable, and practical use is difficult.

The present invention has been devised in view of the conventional problems, and in a high-pressure rubber hose having a reinforcing layer wound in a spiral shape, it is possible to prevent early breakage of a wire and to quickly break a high-pressure rubber hose. Can be prevented, the durability of the high-pressure rubber hose can be improved, and the weight and flexibility can be improved.
It is an object of the present invention to provide a high-pressure rubber hose that can effectively prevent 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. Forming a pair of reinforcing layers with a wire wound in the opposite direction to the winding direction of the aromatic polyamide fiber cord, the reinforcing layer between the inner rubber layer and the outer rubber layer, the pair of reinforcing layers The gist of the present invention is that a plurality of layers are stacked.

[0008] Further, the spiral construction angle of the aromatic polyamide fiber cord of the pair of reinforcing layers is set to the same angle as the spiral construction angle of the wire, and preferably larger than that.

[0009]

According to the present invention, the aromatic polyamide fiber cord is spirally wound on the inner rubber layer, and the aromatic polyamide fiber cord is interposed between the aromatic polyamide fiber cord and the intermediate rubber layer. For example, by winding a wire in the opposite direction to the winding direction of the group III polyamide fiber cord to form a pair of reinforcing layers, and forming a plurality of the pair of reinforcing layers between the inner rubber layer and the outer rubber layer, for example, Even if wires overlap, the adjacent reinforcing layer is made of aromatic polyamide fiber cord, so that it does not come into contact with the wires of other layers, thereby preventing early work of the wires and preventing early destruction of the high-pressure rubber hose. By using a wire as the outermost reinforcing layer, it is easy to prevent the fitting from coming off, and the durability of the high-pressure rubber hose can be improved. One flexibility can be improved,
The stopper can be effectively prevented from coming off.

[0010]

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 1 embodying the present invention.
Reference numeral 2 denotes an inner rubber layer, and 7 denotes 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 interposed therebetween. And a reinforcing layer 8b in which a wire Y is spirally wound in a direction opposite to the winding direction of the aromatic polyamide fiber cord X.

In an embodiment of the present invention, an aromatic polyamide fiber cord X wound spirally on the inner rubber layer 2 is used.
And a wire Y wound in the opposite direction to the winding direction of the aromatic polyamide fiber cord X on 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 8 b is formed of the wire Y from the viewpoint of preventing the high-pressure rubber hose 1 from coming off the fitting.

In the above embodiment, the pair of reinforcing layers 8
a has a two-layer structure, but is not limited to the above embodiment.
A plurality of pairs of reinforcing layers may be configured. Further, the intermediate rubber layer 5 is interposed between each pair, and the respective layers are adhered with an adhesive. Further, the spiral construction angle of the aromatic polyamide fiber cord 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.

The reason for this is that the relationship between the elongation of the wire Y and the cutting load of the aromatic polyamide fiber cord X is as follows.
As shown in FIG. 4, the aromatic polyamide fiber cord X is more easily stretched under the same load, and the angle of the reinforcing layers 8a and 8b changes to a direction at which the reinforcing layers 8a and 8b become stationary angles (54 ° 44 ′).
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 pressing. Will be.

For example, as shown in FIG. 3, the aromatic polyamide fiber cord X applied at an angle α _A is changed to an angle α _O by pressurization and becomes balanced (to have a substantially stationary angle). At that time, although the point A is A ₁ point if the angle changes, the A ₂ points since extended aromatic polyamide fiber cord X.
Now, in order for point A to be balanced at point A ₁ by pressurization, the elongation of aromatic polyamide fiber cord X is taken into consideration, and if only the angle changes, point B ₁ is reached. When this is returned to the non-pressurized state, B
Becomes a point, the angle at that time is the α _B. That is, if the angle of the small wire Y elongation and alpha _A, greater aromatic polyamide fiber cords X of elongation, unbalanced unless the alpha _B, it become possible to high-pressure rubber hose 1 is twisted. To compensate for this, wire Y
By applying 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 show the results of experiments in which the high-pressure rubber hose 1 having the above-described configuration is compared with a conventional product. The inner diameter of the hose and the outer diameter of the hose were made the same, and the material and construction angle of the reinforcing layer were changed from the first to the fourth. It was found that the hose was excellent in force, torsion ratio of the hose when pressurized, and hose weight.

[0016]

[0017]

As described above, the pair of reinforcing layers 8a and 8b
With a wire Y wound on the aromatic polyamide fiber cord X in a direction opposite to the winding direction of the aromatic polyamide fiber cord X via the intermediate rubber layer 4,
As shown in FIG. 2, even if the wires Y overlap, the aromatic polyamide fiber cords X in the adjacent layers are compressed and deformed, so that early fatigue of the wire Y can be effectively prevented, and early destruction of the high-pressure rubber hose is effectively prevented. You can do it.

[0019]

According to the present invention, there is provided an aromatic polyamide fiber cord wound spirally on the inner rubber layer as described above, and the aromatic polyamide fiber on the aromatic polyamide fiber cord via an intermediate rubber layer. A pair of reinforcing layers are constituted 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 wire fitting 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 the fitting can be effectively prevented from coming off.

[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 explanatory view showing a state in which cords of a reinforcing layer of the present invention overlap or intersect.

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

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

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

FIG. 6 is an explanatory view showing a state where cords of a conventional reinforcing layer overlap or intersect.

[Explanation of symbols]

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

──────────────────────────────────────────────────の Continuation of the front page (56) References Japanese Utility Model Showa 57-139778 (JP, U) Special Publication Hei 3-81035 (JP, B2) Special Publication 44-11758 (JP, B1) Special Publication Hei 3- 80095 (JP, B2) Jikken Sho 59-29194 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 11/10 B32B 1/08 B32B 25/10 F16L 11/08

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 aromatic rubber is spirally wound on the inner rubber layer. A pair of reinforcing layers are constituted by a polyamide fiber cord and a wire wound in a direction opposite to a direction in which the aromatic polyamide fiber cord is wound on the aromatic polyamide fiber cord with an intermediate rubber layer interposed therebetween. A high-pressure rubber hose comprising a plurality of the above-mentioned pair of reinforcing layers laminated between an inner rubber layer and an outer rubber layer, and the outermost reinforcing layer being a wire. 2. The high-pressure rubber hose according to claim 1, wherein the spiral construction angle of the aromatic polyamide fiber cord of the pair of reinforcing layers is set to the same angle as the spiral construction angle of the wire, and more preferably.