JP2005147345A - High pressure hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high pressure hose having an insert cloth layer interposed between an inner rubber layer and a cord reinforcement layer, further improved in durability and pressure resistance. <P>SOLUTION: In this high-pressure hose, at least one cord reinforcement layer formed by spirally winding a reinforcement cord is disposed between the inner rubber layer and an outer rubber layer, and the insert cloth layer is disposed between the first code reinforcement layer from inside and the inner rubber layer. The insert cloth of the insert cloth layer is wound spirally in the reverse direction to that of the reinforcement cord of the first cord reinforcement layer, and the thickness G(mm), the longitudinal strength (N/3 cm) and unit mass (g/m<SP>2</SP>) of the insert cloth are respectively related to each other to satisfy the following expressions: 0.10≤n×G≤0.70, 35≤n×T≤300, and 15≤n×W≤160 (wherein n is the number of insert cloth pieces). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a high pressure hose, and more particularly to a high pressure hose with improved durability and pressure resistance.

  A high-pressure hose used for transporting coolant of an internal combustion engine is configured by inserting a cord reinforcement layer in which a reinforcement cord such as a wire cord is wound in a spiral between an inner rubber layer and an outer rubber layer. In such a high-pressure hose, in order to prevent the reinforcing cord of the cord reinforcing layer from biting into the inner rubber layer, a tape-like interlace between the inner rubber layer and the cord reinforcing layer is the same as the winding direction of the reinforcing cord. An intervening cloth layer is interposed while being overlapped so that two sheets are overlapped in the spiral direction (see Patent Document 1).

However, in the conventional high-pressure hose, the insertion cloth is wound in the same spiral direction as the winding direction of the reinforcement cord of the cord reinforcement layer as described above. There is a problem that a so-called shelf drop phenomenon occurs that penetrates into the inner rubber layer and the hose bursts from the shelf drop portion. In addition, when a part of the reinforcing cord falls between the warp yarns of the interstitial cloth, unevenness in the arrangement of the reinforcing cords occurs, so that an equal reinforcing effect cannot be obtained for the entire hose, and pressure resistance and durability are improved. There was a decrease.
JP-A-9-203484

  The object of the present invention is to solve the above-mentioned conventional problems, and in a high-pressure hose in which an intercalation layer is interposed between the inner rubber layer and the cord reinforcing layer, the high pressure is further improved in durability and pressure resistance. To provide a hose.

In the high-pressure hose of the present invention that achieves the above object, at least one cord reinforcing layer in which a reinforcing cord is spirally wound is disposed between an inner rubber layer and an outer rubber layer, and the first one from the inside is arranged. In the high-pressure hose in which an interlaced cloth layer is disposed between the cord reinforcing layer and the inner rubber layer, the intercalated cloth intercalated cloth is spirally formed in a direction opposite to the reinforcing cord of the first cord reinforcing layer. And the thickness G (mm) of the intercalation cloth, the strength T (N / 3 cm) in the longitudinal direction of the intercalation cloth, and the unit mass W (g / m ² ) of the intercalation cloth, Each is characterized by satisfying the following expressions (1), (2) and (3).
0.10 ≦ n × G ≦ 0.70 (1)
35 ≦ n × T ≦ 300 (2)
15 ≦ n × W ≦ 160 (3)
However, n is the number of the interlaces.

  In addition, the present invention is characterized in that a steel cord is preferably used as the reinforcing cord.

  According to the present invention, the winding direction of the interpolating cloth of the intercalating cloth layer is spiraled in the direction opposite to the reinforcing cord of the first cord reinforcing layer from the inside, so that the reinforcing cord and the interpolating cloth By crossing the warp yarn and setting the thickness, strength, and unit mass of the intercalation cloth appropriately, it is possible to prevent the reinforcing cord from falling into the inner rubber layer and disturbing the arrangement. Become. As a result, since the first cord reinforcing layer from the inside maintains appropriate adhesion to the inner rubber layer and exhibits the maximum reinforcing effect, the durability and pressure resistance of the hose can be further improved.

  First, an embodiment of the high-pressure hose of the present invention will be described with reference to the drawings.

  In FIG. 1, the high-pressure hose includes an inner rubber layer 1, an interlaced cloth layer 2, a first cord reinforcing layer 3 a, an intermediate rubber layer 4, a second cord reinforcing layer 3 b, and an outer rubber layer 5 in order from the inside. Are laminated. The first and second cord reinforcing layers 3a and 3b are formed so that the reinforcing cord 13 is wound around the hose shaft in a spiral shape and the spiral direction is changed between layers in the opposite direction. Yes. The interlaced cloth layer 2 is formed by winding a tape-shaped intercalated cloth 12 in a spiral shape, and the direction of the spiral is opposite to the reinforcing cord 13 of the first cord reinforcing layer 3a. Yes.

  In the example shown in the figure, the first and second layers are provided as the cord reinforcing layer. However, the cord reinforcing layer may be only one layer or three or more layers depending on the use of the hose. It may be arranged.

  In the present invention, the rubber material for the inner rubber layer, the intermediate rubber layer, and the outer rubber layer is not particularly limited, and examples thereof include styrene butadiene rubber (SBR), acrylonitrile butadiene rubber (NBR), and chlorosulfonated polyethylene. (CSM), ethylene propylene diene terpolymer rubber (EPDM), butyl rubber (IIR), chlorinated butyl rubber (Cl-IIR), brominated butyl rubber (Br-IIR), hydrin rubber (CHR, CHC), acrylic rubber ( ACM) and chloroprene rubber (CR) can be exemplified. These rubber materials may be different from each other among the inner rubber layer, the intermediate rubber layer, and the outer rubber layer, or may be the same. The thickness of each rubber layer varies depending on the use of the hose, but the inner rubber layer and the outer rubber layer are about 0.5 to 2.5 mm, and the intermediate rubber layer is about 0.1 to 0.8 mm. Is good.

  In the present invention, the reinforcing cord constituting the cord reinforcing layer may be either a steel cord or an organic fiber cord. However, steel cords are particularly preferred for high pressure hoses. In the case of organic fiber cords, those having high elasticity and high strength such as aramid cords and polyester cords are preferable.

  The intercalation layer is formed by stacking one or more tape-shaped intercalation cloths and winding them in a spiral around the inner rubber layer. The interpolating cloth constituting the intercalating cloth layer is a woven fabric in which polyester fibers such as polyethylene terephthalate and polyamide fibers such as nylon 6 and nylon 66 are warp yarns, and further, the same fibers or different fibers are driven into the weft yarns, or A knitted fabric using the above fibers is preferably used.

  The high-pressure hose of the present invention is characterized by the structure of the intercalation cloth constituting the intercalation cloth layer and its usage. One of the features is that the tape-like interlace cloth is wound so that its longitudinal direction intersects the spiral winding direction of the reinforcing cord of the first cord reinforcing layer from the inside in the opposite direction. is there. By wrapping in this way, the reinforcing cord of the first cord reinforcing layer intersects with the longitudinal direction of the intercalation cloth, so that the inner rubber layer is greatly dropped on the shelf, or the arrangement is partially disturbed. It does not occur, variation in unevenness in the thickness direction is reduced, and uniform reinforcement can be performed.

Furthermore, the other features are the thickness G (mm) of the intercalation cloth constituting the intercalation cloth layer as described above, the strength T (N / 3 cm) in the longitudinal direction of the intercalation cloth, and the unit of the intercalation cloth The mass W (g / m ² ) satisfies the following formulas (1), (2) and (3).
0.10 ≦ n × G ≦ 0.70 (1)
35 ≦ n × T ≦ 300 (2)
15 ≦ n × W ≦ 160 (3)
However, n is the number of the interlaces.

  In this way, the thickness and strength of the intercalation layer specified by the number of intercalation cloths are specified, and the first cord reinforcement layer arranged in a spiral outside the inner rubber layer by limiting the unit mass Thus, the reinforcing cord can be appropriately bitten in the thickness direction of the intercalating cloth layer, and the reinforcing effect on the inner rubber layer can be enhanced. Moreover, the adhesiveness between the layers of the first cord reinforcing layer / intercalating layer / inner rubber layer can be improved, and the durability and pressure resistance as a high-pressure hose can be further improved.

Examples 1-7, Comparative Examples 1-4
SBR / NBR is used for the inner rubber layer, CR is used for the intermediate rubber layer, and CR / SBR is used for the outer rubber layer. Four cord reinforcing layers made of steel cords with a thickness of 0.8 mm are arranged, and the inner diameter is 50.8 mm. When forming a high-pressure hose with an outer diameter of 75 mm, the thickness G, the longitudinal strength T, and the unit of the interwoven cloth layer (knitted fabric) inserted between the inner rubber layer and the first cord reinforcing layer Eleven types of high-pressure hoses with different masses W as shown in Table 1 were produced.

About these 11 types of high-pressure hoses, the following evaluation methods evaluated the penetration of the reinforcement cord into the inner rubber layer, the arrangement of the reinforcement cord, the adhesion between the reinforcement cord and the inner rubber layer, and the durability and pressure resistance of the hose. The results are shown in Table 1.
〔Evaluation methods〕
○: Good △: Good ×: Bad

1 is a perspective view showing a partially cutaway embodiment of a high-pressure hose according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner rubber layer 2 Intercalation layer 3a 1st cord reinforcement layer 3b 2nd cord reinforcement layer 4 Intermediate rubber layer 5 Outer rubber layer 12 Reinforcement cord 13 Intercalation

Claims (2)

Between the inner rubber layer and the outer rubber layer, there is arranged at least one cord reinforcing layer in which a reinforcing cord is wound in a spiral shape, and between the first cord reinforcing layer from the inner side and the inner rubber layer. In the high-pressure hose where the intercalation layer is arranged,
The interpolating layer is wound in a spiral shape in the opposite direction to the reinforcing cord of the first cord reinforcing layer, and the thickness G (mm) of the intercalating fabric is A high-pressure hose in which the longitudinal strength T (N / 3 cm) and the unit mass W (g / m ² ) of the intercalation cloth are within the ranges satisfying the following expressions (1), (2) and (3), respectively.
0.10 ≦ n × G ≦ 0.70 (1)
35 ≦ n × T ≦ 300 (2)
15 ≦ n × W ≦ 160 (3)
However, n is the number of the interlaces. The high-pressure hose according to claim 1, wherein the reinforcing cord is a steel cord.

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