JPH0926062A - High pressure hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hose which can be bent easily without impairing metal fitting mounting property by increasing wire density in the innermost layer of a wire reinforcing layer than wire density of all the other layers or a part of layers and decreasing wire strength in the innermost layer of the wire reinforcing layer than wire strength of all the other layers or a part of layers. SOLUTION: A wire reinforcing layer 3 which consists of a plurality of layers and has a spiral structure is embedded between an inner face layer 1 and an outer face layer 2 made of a flexible material such as rubber. Wire density of an innermost layer 31 of the wire reinforcing layer 3 is larger than wire density of all the other layers 31 or a part of the layer. That is, wire density of the other layer 32 is made 7% or more smaller than wire density of the innermost layer of 92% or 97%. Moreover, wire strength of the innermost layer 31 of the wire reinforcing layer 3 is smaller than wire strength of all the other layers 32 or a part of the layers. Consequently, it is possible to bend a high pressure hose easily and reduce bending force without impairing metal fitting mounting property.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure hose reinforced with a plurality of wire layers and having excellent flexibility.

[0002]

2. Description of the Related Art Conventionally, in the case of making a high-pressure hose reinforced with a wire flexible, either of the following two methods has been often performed. For example, one way to do that is
This is a method of reducing the density of the wires and softening them by using wires with a small wire diameter or reducing the number of wires used.

Another method is to thicken the inner surface layer or to provide a rubber layer between the reinforcing layers so that when the wire is bent, restraint of movement such as change in angle of the wire is made as easy as possible to bend the wire. Is. However, the above-mentioned conventional technique can achieve the flexibility, but is insufficient. The reason is that the former conventional technique often fails to achieve the target hose pressure resistance strength. When the wire density of the innermost wire reinforcing layer is reduced, a flexible material such as rubber easily comes out between the wires, and pinholes are easily generated in the inner surface layer. The density of the wire could not be made too low.

Further, the method of thickening the inner surface layer or providing the rubber layer between the reinforcing layers increases the amount of rubber, resulting in an increase in weight and cost, and a hose becomes soft in the radial direction. There was a problem of poor wearability.

[0005]

SUMMARY OF THE INVENTION The present invention has been devised in view of the above-mentioned conventional problems, and does not cause pinholes in the inner surface layer, which does not increase the weight or the cost, and the metal fittings. An object of the present invention is to provide a high-pressure hose that is sufficiently flexible, easy to bend, and has a small bending force without impairing the mountability.

[0006]

In order to achieve the above object, the present invention provides a high-pressure hose of the present invention with a plurality of wire reinforcements between an inner surface layer and an outer surface layer made of a flexible material such as rubber or synthetic resin. The layer is buried, the wire density of the innermost layer of the wire reinforcement layer is higher than the wire density of all or some of the other layers of the wire reinforcement layer, and the wire strength of the innermost layer of the wire reinforcement layer is The wire reinforcing layer is configured to have a wire strength lower than that of all or some of the other layers of the wire reinforcing layer.

The wire density of the innermost wire reinforcing layer is 92% to 97%, and the wire density of the other layers is 7% or more smaller than the wire density of the innermost layer. It is more preferable. Further, in the present invention, the wire reinforcing layer may have either a spiral structure or a braid structure, but particularly in the spiral structure, a more preferable effect is exhibited.

According to the present invention, the wire density of the other layer is smaller than that of the innermost layer, and the wire strength of the other layer is larger than that of the innermost layer. Therefore, the innermost layer has pinholes in the inner surface layer. The wire density is set so that it does not occur, and the other layers have a low wire density so that the hose can be flexible, and the wire density is low so that the pressure resistance does not decrease. The hose can be made flexible while maintaining the pressure resistance required by the high pressure hose.

This is a very different idea from the prior art in which the strength and density of each wire reinforcing layer are set to be substantially the same, and the present invention satisfies the required pressure resistance and Moreover, a sufficiently flexible high pressure hose can be provided.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in comparison with a conventional high pressure hose with reference to the accompanying drawings. FIG. 1 shows an example in which the wire reinforcing layer has a spiral structure, and FIG. 2 shows an example in which the blade structure has a blade structure.

In the high-pressure hose having the spiral structure, a wire reinforcing layer 3 having a spiral structure composed of a plurality of layers is embedded between an inner surface layer 1 and an outer surface layer 2 made of a flexible material such as rubber. The inner layer 31 has a higher wire density and a lower wire strength than the other layers 32. Similar to the spiral structure, the high-pressure hose having a braid structure has a plurality of braided wire reinforcement layers 6 embedded between an inner surface layer 4 and an outer surface layer 5 made of a flexible material such as rubber. The innermost layer 61 of the wire reinforcing layer has a higher wire density and a lower wire strength than the other layers 62.

Table 1 shows the wire constitution of the wire reinforcing layer 3 of Example 1 of the present invention and Comparative Example 1 designed by the conventional design concept, the bending force of the hose, etc., and the wire diameters are all 0.6 mm. Is. Table 2 also shows Example 2 of this invention.
And the wire configuration of the wire reinforcing layer 3 of Comparative Example 2 designed by the conventional design concept, the bending force of the hose, and the like are shown, and the wire diameters are all 0.4 mm.

The wire reinforcing layers of Examples 1 and 2 and Comparative Examples 1 and 2 have a spiral structure. The symbols in the wire strength column in the table are as follows and represent the wire strength. Reg (Regular): Tensile strength 2350N (Newton) / mm ² HT (High tension): Tensile strength 2750N (Newton) / mm ² SHT (Ultra high tension): Tensile strength 3200N (Newton) / mm ² MPa Megapascal, N represents Newton, and the bending force is the force when bending to the minimum bending radius (hose inner diameter × 10).

The wire density is calculated by the following equation. Wire density (N) = n · d / pitch · sin d / 2 n: Number of wires d: Wire wire diameter (mm) d / 2: Braid angle (°) The bending force of Example 1 in Table 1 is Comparative Example 1 Is 80% of the bending force of Example 2, and the bending force of Example 2 in Table 2 is 67% of that of Comparative Example 2, both of which are much more flexible than the Comparative Example designed by the conventional design concept.

The innermost layers 31 and 61 of the present invention preferably have a wire density of 92% to 97%, and the other layers 32 and 62 preferably have a wire density of 7% or more lower than the innermost layer. More preferably, the wire density of the other layers 32 and 62 is 60% to 85%. When the wire density of the innermost layer is 91% or less, pinholes are easily generated in the inner surface layer, and the wire density of the innermost layer is 98%.
% Or more, the flexibility of the hose will be impaired. Further, unless the wire density of the other layer is lower than the wire density of the innermost layer by 7% or more, the effect of flexibility is small. The structure of the wire reinforcing layer has the effect of flexibility in both the spiral structure and the braided structure.

[0016]

[Table 1]

[0017]

[Table 2]

[0018]

Since the high-pressure hose of the present invention is constructed as described above, it does not cause pinholes in the inner surface layer, and does not increase weight or cost.
It is flexible enough, easy to bend, and has a small bending force, though it does not impair the fitting of metal fittings.

Therefore, the high-pressure hose of the present invention can be easily installed with a small force even in a narrow space, and the reaction force when it is bent is small, so the strength of the member to which the high-pressure hose is installed is also small. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a crushing side view showing an embodiment of the present invention.

FIG. 2 is a crushing side view showing another embodiment of the present invention.

[Explanation of symbols]

1,4 inner surface layer 2,5 outer surface layer 3,6 wire reinforcement layer 31,61 innermost layer of wire reinforcement layer 32,62 other layer of wire reinforcement layer

[Procedure amendment]

[Submission date] January 10, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

The wire density is calculated by the following equation. Wire density (N) = n · d / pitch · sin α / 2 n: Number of wires d: Wire wire diameter (mm) α / 2: Braid angle (°) The bending force of Example 1 in Table 1 is Comparative Example 1 The bending force of Example 2 in Table 2 is 67% of the bending force of Comparative Example 2, and both are much more flexible than the Comparative Example designed by the conventional design concept.

Claims (3)

[Claims] 1. A high-pressure hose in which a plurality of wire reinforcing layers are embedded between an inner surface layer and an outer surface layer made of a flexible material such as rubber, and the wire density of the innermost layer of the wire reinforcing layer is different from that of other layers. Is higher than the wire density of all or some of the layers, and the wire strength of the innermost layer of the wire reinforcing layer is less than the wire strength of all or some of the other layers. 2. The wire density of the innermost layer of the wire reinforcing layer is 92% to 97%, and the wire density of all or some of the other layers is 7% or more smaller than the wire density of the innermost layer. The high pressure hose according to claim 1. 3. The high pressure hose according to claim 1, wherein the wire reinforcing layer has a spiral structure.