JP2006220262A - High pressure rubber hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high pressure rubber hose preventing biting of a steel wire into an inner face rubber layer in the hose reinforced by the steel wire while reducing a manufacturing cost, and improving productivity. <P>SOLUTION: A monofilament or a stranded cord 6a comprised of a low contractility material is spirally wound around the inner face rubber layer 2 in the hose reinforced by the steel wire w of a spiral structure. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a high-pressure rubber hose, and more particularly, to reduce the manufacturing cost and improve productivity while preventing the steel wire reinforced hose from biting into the inner rubber layer of the steel wire. High pressure rubber hose.

  A high-pressure hose is known in which a plurality of steel wire reinforcing layers having a spiral structure are disposed between an inner rubber layer and an outer rubber layer. In these hoses, the steel wire is wound around the unvulcanized inner rubber layer at a predetermined tension so that the steel wires are arranged at equal intervals in the longitudinal direction. There is a problem that the performance of the hose body is affected by uneven thickness.

  As a countermeasure, conventionally, as shown in FIG. 3, for example, a belt-like cloth S is wound between the inner rubber layer 2 and the innermost layer 5a of the steel wire reinforcing layers 5a, 5b, 5c, and 5d. The steel wire w was prevented from biting into the inner rubber layer 2.

However, in this measure, the belt-like cloth S is expensive, and the process for winding the cloth S impedes productivity, and further, the adhesion between the cloth S to be inserted and the steel wire reinforcing layer 5a is prevented. In order to ensure, since it is necessary to interpose an adhesive rubber layer (not shown) between them, there is a proposal to provide an auxiliary layer made of untwisted or sweet-twisted fibers instead of this ( For example, see Patent Documents 1 and 2.) However, in these proposals, it is difficult to surely prevent the steel wire w from getting into the inner rubber layer 2 depending on the type of fiber constituting the auxiliary layer, and there is still room for improvement.
JP-A-9-96381 Japanese Patent Laid-Open No. 10-19172

  An object of the present invention is to eliminate such problems, and while reducing the manufacturing cost and improving productivity, the hose reinforced with steel wire bites into the inner rubber layer of the steel wire. An object of the present invention is to provide a high-pressure rubber hose designed to prevent this.

  In order to achieve the above object, in the high pressure rubber hose of the present invention, at least one steel wire reinforcing layer having a spiral structure is disposed between an inner rubber layer and an outer rubber layer, and the inner rubber layer and the steel wire reinforcing layer are arranged. In the high-pressure rubber hose in which an auxiliary layer made of a non-metallic fiber is disposed between the innermost layer and the innermost layer, the auxiliary layer is composed of a monofilament or a twisted cord of a low-shrinkage material, and the monofilament or the twisted cord is The gist is that it is wound around in a spiral.

  In the high pressure rubber hose of the present invention, the monofilament or twisted cord made of a low shrinkage material is wound around the inner rubber layer of the hose reinforced with a spiral wire as an auxiliary layer in a spiral shape. This auxiliary layer prevents the innermost steel wire from biting into the inner rubber layer side, and the monofilament or twisted cord constituting the auxiliary layer itself has low shrinkage. The steel wire does not shrink toward the inner rubber layer side, and it is possible to reliably prevent the steel wire from biting into the inner rubber layer side.

  Furthermore, since the auxiliary layer described above is composed of a monofilament or a twisted cord, the material cost can be reduced, and since it is wound around the inner rubber layer in a spiral shape, the step of winding the monofilament or the twisted cord is performed. Since it can synchronize with the winding process of the steel wire of a steel wire reinforcement layer, productivity can be improved.

  Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing a part of an example of the high-pressure rubber hose according to the present invention.

  In the high-pressure rubber hose 1, at least one steel wire reinforcing layer 5 a, 5 b, 5 c, 5 d is disposed between the inner rubber layer 2 and the outer rubber layer 3 via the intermediate rubber layer 4. is doing. When the steel wire reinforcing layer is composed of one layer, the intermediate rubber layer 4 is not disposed.

  Each of the steel wire reinforcing layers 5a, 5b, 5c, and 5d is formed by winding a steel wire w around the inner rubber layer 2 in a spiral shape. The spiral direction of the steel wire w in the first and third steel wire reinforcing layers 5a and 5c and the spiral direction of the steel wire w in the second and fourth steel wire reinforcing layers 5b and 5d are respectively The steel wires w are wound in opposite directions with respect to the hose axial direction, and the steel wires w are arranged so as to cross each other.

  An auxiliary layer 6 made of non-metallic fibers is disposed between the inner rubber layer 2 and the innermost steel wire reinforcing layer 5a. The auxiliary layer 6 is formed of a monofilament or twisted cord 6a made of a low-shrinkage material. The layer 2 is wound around in a spiral shape.

  As shown in FIG. 2, the monofilament or twisted cord 6a is sent out from a plurality of reels 7 in the molding stage of the high-pressure rubber hose 1 and wound around the unvulcanized inner rubber layer 2 in a spiral shape. The steel wire w constituting the steel wire reinforcing layer 5a is wound in a spiral shape.

  Thereby, in the winding process in the molding stage of the high-pressure rubber hose 1, the auxiliary layer 6 made of monofilament or twisted cord 6a prevents the steel wire reinforcing layer 5a from biting into the inner rubber layer 2 side of the steel wire w and assists. Since the monofilament or twisted cord 6a constituting the layer 6 itself has low shrinkage, the monofilament or twisted cord 6a does not shrink toward the inner rubber layer 2 in the vulcanization process, and the inner rubber layer 2 of the steel wire w Biting into the side can be reliably prevented.

  Furthermore, since the above-mentioned biting prevention layer is composed of a monofilament or a twisted cord 6a, the material cost can be reduced as compared with the conventional belt-like cloth, and the inner rubber layer 2 is wound in a spiral shape. Since the winding process can be synchronized with the winding process of the steel wire w of the steel wire reinforcing layer 5a, the productivity can be improved.

  In the present invention, the spiral direction of the monofilament or twisted cord 6a made of a low shrinkage material may be crossed with the spiral direction of the steel wire reinforcing layer 5a as shown in FIGS. Thereby, it is possible to prevent the steel wire reinforcing layer 5a from getting into the inner rubber layer 2 of the steel wire w more efficiently.

  Furthermore, the fiber density of the monofilament or the twisted cord 6a on the outer peripheral surface of the inner rubber layer 2 may be adjusted to 5 to 90%, preferably 20 to 80%. If it exceeds 90%, sufficient adhesion between the inner rubber layer 2 and the steel wire w of the steel wire reinforcing layer 5a cannot be obtained, and separation is likely to be induced. If it is less than 5%, the inner rubber of the steel wire w of the steel wire reinforcing layer 5a is likely to be induced. It becomes difficult to obtain the effect of suppressing biting into the layer 2.

  The monofilament or twisted cord 6a of the present invention is made of a low shrinkage material. As the low shrinkage material, synthetic fibers such as nylon and polyester, or natural fibers such as cotton are preferably used, and one kind selected from these materials. Or it is good to use 2 or more types of materials. Furthermore, the dry heat shrinkage rate at 150 ° C. for 30 minutes of the monofilament or twisted cord 6a may be adjusted to 2% or less. Thereby, the shrinkage of the monofilament or twisted cord 6a to the inner rubber layer 2 side in the vulcanization stage is surely suppressed, and the steel wire w of the steel wire reinforcing layer 5a is more reliably bited into the inner rubber layer 2 side. Can be prevented.

  As described above, the high-pressure rubber hose of the present invention is obtained by winding a monofilament or a twisted cord made of a low shrinkage material around an inner rubber layer in a hose reinforced with a steel wire in a spiral shape as an auxiliary layer. This prevents the innermost steel wire of the wire reinforcement layer from getting into the inner rubber layer, and since this auxiliary layer does not function as a pressure tension member that maintains the internal pressure of the hose, the hose can be made compact. From the surface, it can function satisfactorily by being composed of a monofilament or twisted cord made of a low shrinkage material. Therefore, it is not necessary to use a belt-like cloth as in the prior art, and it is possible to use an inexpensive material compared to the conventional belt-like cloth, thereby improving productivity during molding. It is.

It is a perspective view which cuts and shows a part which shows an example of the high pressure rubber hose of this invention. It is explanatory drawing which shows the formation process of the high pressure rubber hose of this invention. It is explanatory drawing which shows an example of the shaping | molding process of the conventional high pressure rubber hose.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High pressure rubber hose 2 Inner rubber layer 3 Outer rubber layer 4 Intermediate rubber layer 5a, 5b, 5c, 5d Steel wire reinforcement layer 6 Auxiliary layer 6a Monofilament or twisted cord 7 Reel w Steel wire

Claims (5)

At least one steel wire reinforcing layer having a spiral structure is disposed between the inner rubber layer and the outer rubber layer, and the auxiliary layer is made of non-metallic fibers between the inner rubber layer and the innermost layer of the steel wire reinforcing layer. In the high pressure rubber hose with
A high-pressure rubber hose in which the auxiliary layer is composed of a monofilament or a twisted cord made of a low shrinkage material, and the monofilament or the twisted cord is spirally wound around the inner surface rubber layer.   The high-pressure rubber hose according to claim 1, wherein the spiral direction of the monofilament or the twisted cord intersects with the spiral direction of the innermost layer of the steel wire reinforcing layer.   The high-pressure rubber hose according to claim 1 or 2, wherein the low-shrinkage material is one or more selected from nylon, polyester, or cotton.   4. The high-pressure rubber hose according to claim 1, wherein a fiber density of the monofilament or the twisted cord on the outer peripheral surface of the inner rubber layer is 5 to 90%. The high-pressure rubber hose according to any one of claims 1 to 4, wherein a drying shrinkage rate at 150 ° C for 30 minutes of the monofilament or twisted cord is 2% or less.

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