JP4967589B2 - Manufacturing method of high pressure hose - Google Patents

Manufacturing method of high pressure hose Download PDF

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JP4967589B2
JP4967589B2 JP2006284111A JP2006284111A JP4967589B2 JP 4967589 B2 JP4967589 B2 JP 4967589B2 JP 2006284111 A JP2006284111 A JP 2006284111A JP 2006284111 A JP2006284111 A JP 2006284111A JP 4967589 B2 JP4967589 B2 JP 4967589B2
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pressure hose
rubber layer
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JP2008101681A (en
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義典 玉田
和人 梁取
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Yokohama Rubber Co Ltd
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Description

本発明は、高圧ホースの製造方法に関し、さらに詳しくは、優れた耐久性および耐圧性を有するとともに、金具加締め部の内側ゴム層のはく離を防止して耐久性を一層向上させることができる高圧ホースの製造方法に関するものである。 The present invention relates to a method for manufacturing a high-pressure hose. More specifically, the high-pressure hose has excellent durability and pressure resistance, and can further improve durability by preventing peeling of an inner rubber layer of a metal fitting crimped portion. The present invention relates to a method for manufacturing a hose.

油圧作動機械に用いられる高圧ホースは、一般的に内側ゴム層と外側ゴム層との間にワイヤコード等の補強コードをスパイラル状に巻回して形成した１層、或いは複層のコード補強層を介挿して構成されている。このような高圧ホースでは、コード補強層を形成する補強コードが内側ゴム層に食い込んでホースを破裂させる不具合を防止するために、内側ゴム層とコード補強層との間にテープ状の間挿布をその長手方向を補強コードの巻付け方向と同じスパイラル方向にして一部をオーバラップさせて形成した間挿布層を介在するようにしている（例えば、特許文献１参照）。   A high-pressure hose used for a hydraulically operated machine generally has a single-layer or multi-layer cord reinforcement layer formed by winding a reinforcement cord such as a wire cord in a spiral shape between an inner rubber layer and an outer rubber layer. It is configured with insertion. In such a high-pressure hose, in order to prevent a problem that the reinforcing cord forming the cord reinforcing layer bites into the inner rubber layer and ruptures the hose, a tape-like interlace is provided between the inner rubber layer and the cord reinforcing layer. An intervening cloth layer is formed with the longitudinal direction thereof set in the same spiral direction as the winding direction of the reinforcing cord and partially overlapped (see, for example, Patent Document 1).

しかしながら、この構造では補強コードと間挿布とが同じスパイラル方向に巻付けられているため、間挿布の縦糸と縦糸との間に補強コードの一部が入り込んで内側ゴム層に食い込む、いわゆる棚落ち現象が生じて十分な耐久性および耐圧性を得ることが困難であるという問題があった。また、高圧ホースを継手等に接続する際に、金具加締め部となる内側ゴム層が加締めによって圧縮されて大きく変形し、内側ゴム層とコード補強層とがはく離する、いわゆるチューブバルジが発生するという問題があった。   However, in this structure, since the reinforcing cord and the interposer are wound in the same spiral direction, a part of the reinforcing cord enters between the warp and warp of the interposer and soaks into the inner rubber layer. There was a problem that it was difficult to obtain sufficient durability and pressure resistance due to the shelves dropping phenomenon. In addition, when connecting a high-pressure hose to a joint, etc., the inner rubber layer that becomes the bracket crimping part is compressed and greatly deformed by crimping, and a so-called tube bulge is generated in which the inner rubber layer and the cord reinforcement layer peel off. There was a problem to do.

このような問題を解決するため、本願の発明者らは、間挿布の長手方向がコード補強層の補強コードと交差するように逆方向にスパイラル状に巻回させて構成するとともに、間挿布の厚さ、長手方向の強力および単位質量を適正に設定することにより耐久性および耐圧性に優れた高圧ホースを提案している（特許文献２参照）。   In order to solve such a problem, the inventors of the present application are configured by spirally winding the insertion cloth in a reverse direction so that the longitudinal direction of the insertion cloth intersects the reinforcement cord of the cord reinforcement layer. A high pressure hose excellent in durability and pressure resistance has been proposed by appropriately setting the thickness of cloth, the strength in the longitudinal direction, and the unit mass (see Patent Document 2).

高圧ホースを流通する流体がさらに高圧化すると、これに対応して加締め力が増大し、加締め部の内側ゴム層とコード補強層との間に過大な圧縮応力が生じるため、この圧縮応力による内側ゴム層の変形を抑制してより確実に、はく離を防止できる耐久性をさらに向上した高圧ホースが求められていた。
特開平９−２０３４８４号公報 特開２００５−１４７３４５号公報 When the fluid flowing through the high-pressure hose is further increased in pressure, the caulking force increases correspondingly, and an excessive compressive stress is generated between the inner rubber layer and the cord reinforcing layer of the caulked portion. There has been a demand for a high-pressure hose with further improved durability that can prevent the inner rubber layer from being deformed and prevent peeling more reliably.
JP-A-9-203484 JP 2005-147345 A

本発明の目的は、優れた耐久性および耐圧性を有するとともに、金具加締め部の内側ゴム層のはく離を防止して耐久性を一層向上させることができる高圧ホースの製造方法を提供することにある。 An object of the present invention is to provide a method for producing a high-pressure hose that has excellent durability and pressure resistance, and that can further improve durability by preventing peeling of an inner rubber layer of a fitting crimped portion. is there.

上記目的を達成するため本発明の高圧ホースの製造方法は、内側ゴム層と外側ゴム層との間に補強コードをスパイラル状に巻回した少なくとも１層のコード補強層を配置し、内側から第１番目のコード補強層と前記内側ゴム層との間に間挿布層を配置し、該間挿布層をテープ状の間挿布をその長手方向が前記第１番目のコード補強層の補強コードと交差するように逆方向にスパイラル状に巻回して形成するとともに、該間挿布の厚さＧ（ｍｍ）、該間挿布の長手方向の強力Ｔ（Ｎ／３ｃｍ）および該間挿布の単位質量Ｗ（ｇ／ｍ2）を、該間挿布の積層数をｎとした下記（１）、（２）および（３）式を満足する範囲にした高圧ホースの製造方法であって、前記間挿布の長手方向の乾熱収縮率を１．５％以上４．０％以下に設定し、マンドレルに順次、前記高圧ホースの構成部材を外周に積層し、これを加硫して高圧ホースを製造し、加硫工程において、前記間挿布が熱収縮することにより前記内側ゴム層に食い込ませることを特徴とするものである。
０．１０≦ｎ×Ｇ≦０．７０ ・・・（１）
３５≦ｎ×Ｔ≦３００ ・・・（２）
１５≦ｎ×Ｗ≦１６０ ・・・（３） In order to achieve the above object, the method of manufacturing a high-pressure hose according to the present invention comprises arranging at least one cord reinforcing layer in which a reinforcing cord is spirally wound between an inner rubber layer and an outer rubber layer, and An interlaced cloth layer is disposed between the first cord reinforcing layer and the inner rubber layer, and the interstitial cloth layer is a tape-shaped interlaced cloth whose longitudinal direction reinforces the first cord reinforcing layer. It is formed by spirally winding in the opposite direction so as to cross the cord, 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 intercalation This is a method for producing a high-pressure hose in which the unit mass W (g / m 2 ) of the cloth is in a range satisfying the following formulas (1), (2) and (3), where n is the number of laminated layers of the intercalation cloth. Te, set the longitudinal direction of the dry heat shrinkage ratio of the inter挿布to 4.0% or less than 1.5%, mandrel Sequentially, laminated on the outer circumference of the components of the high-pressure hose, which was to produce a high-pressure hose vulcanization, in the vulcanization step, the inter挿布be bite into the inner rubber layer by thermally shrinking It is characterized by.
0.10 ≦ n × G ≦ 0.70 (1)
35 ≦ n × T ≦ 300 (2)
15 ≦ n × W ≦ 160 (3)

本発明の高圧ホースの製造方法によれば、内側から第１番目のコード補強層と内側ゴム層との間に配置した間挿布層を、テープ状の間挿布の長手方向を第１番目のコード補強層の補強コードと交差するように逆方向にスパイラル状に巻回して形成し、間挿布の厚さ、長手方向の強力および単位質量を適正に設定して優れた耐久性および耐圧性を有しつつ、間挿布の長手方向の乾熱収縮率を１．５％以上４．０％に設定することで、高圧ホースを製造する際の加硫工程において間挿布が熱収縮して適度に内側ゴム層に食い込む。 According to the method for manufacturing a high-pressure hose of the present invention, the intercalation cloth layer disposed between the first cord reinforcement layer and the inner rubber layer from the inside is arranged in the first longitudinal direction of the tape-like intercalation cloth. It is formed by spirally winding in the opposite direction so as to intersect with the reinforcing cord of the cord reinforcing layer of the cord, and it has excellent durability and pressure resistance by appropriately setting the thickness of intercalation cloth, longitudinal strength and unit mass In the vulcanization process when manufacturing a high-pressure hose, the intercalation fabric is thermally shrunk by setting the dry heat shrinkage rate in the longitudinal direction of the intercalation fabric to 1.5% to 4.0%. Then bite into the inner rubber layer moderately.

これにより内側ゴム層が間挿布により補強され、高圧ホースを継手等に接続する際に金具加締め部が強く加締められて圧縮された場合でも、間挿布層と第１番目のコード補強層との間に生じる圧縮応力が分散、緩和されるため、内側ゴム層の変形を抑えて内側ゴム層とコード補強層とのはく離を防止することが可能となり、耐久性を一層向上させることができる。   As a result, the inner rubber layer is reinforced by the intercalation cloth, and the intercalation cloth layer and the first cord reinforcement are strengthened even when the metal caulking portion is strongly caulked and compressed when connecting the high-pressure hose to a joint or the like. Since the compressive stress generated between the inner rubber layer and the cord reinforcing layer can be reduced and relaxed, it is possible to prevent the inner rubber layer from being separated from the cord reinforcing layer and to further improve the durability. it can.

以下、本発明の高圧ホースの製造方法を図に示した実施形態に基づいて説明する。図１に例示するように、本発明により製造される高圧ホース１は、内側から順に内側ゴム層２、間挿布層３、第１番目のコード補強層４、中間ゴム層６、第２番面のコード補強層５および外側ゴム層７をホース軸方向を中心にして同軸状に積層して構成されている。 Hereinafter, the manufacturing method of the high-pressure hose of this invention is demonstrated based on embodiment shown in the figure. As illustrated in FIG. 1, a high-pressure hose 1 manufactured according to the present invention includes an inner rubber layer 2, an intercalation cloth layer 3, a first cord reinforcing layer 4, an intermediate rubber layer 6, and a second one in order from the inside. The cord reinforcing layer 5 and the outer rubber layer 7 on the surface are laminated coaxially with the hose axial direction as the center.

第１番目のコード補強層４および第２番目のコード補強層５は、それぞれの補強コード４ａ、５ａをホース軸方向に対してスパイラル状に巻回して形成されている。これら補強コード４ａ、５ａは互いにスパイラル方向を逆方向にして巻回している。また、間挿布層３はテープ状の間挿布３ａを、その長手方向、即ち、縦糸３ｂの延設方向を第１番目のコード補強層４の補強コード４ａと交差するように逆方向にスパイラル状に巻回して形成されている。   The first cord reinforcement layer 4 and the second cord reinforcement layer 5 are formed by winding the respective reinforcement cords 4a and 5a spirally in the hose axial direction. These reinforcing cords 4a and 5a are wound with their spiral directions opposite to each other. Further, the intercalation cloth layer 3 has a tape-shaped intercalation cloth 3a in the reverse direction so that its longitudinal direction, that is, the extending direction of the warp yarn 3b intersects the reinforcement cord 4a of the first cord reinforcement layer 4. It is formed by winding in a spiral shape.

コード補強層４、５は、図示した２層に限らず、要求性能に応じて１層或いは３層以上が介挿される。コード補強層４、５を１層にした場合は、中間ゴム層６が省略された構造となる。補強コード４ａ、５ａとしては、スチールコードや有機繊維コードを用いることができ、流通する流体の圧力が高い場合は、スチールコードを使用して補強層４、５の剛性を高めることが好ましい。有機繊維コードとしては、アラミドコード、ポリエステルコード等の高弾性、高強力のコード種が好ましい。   The cord reinforcing layers 4 and 5 are not limited to the illustrated two layers, and one layer or three or more layers are inserted depending on the required performance. When the cord reinforcing layers 4 and 5 are made into one layer, the intermediate rubber layer 6 is omitted. As the reinforcing cords 4a and 5a, steel cords or organic fiber cords can be used. When the pressure of the circulating fluid is high, it is preferable to increase the rigidity of the reinforcing layers 4 and 5 using steel cords. The organic fiber cord is preferably a highly elastic and high strength cord type such as an aramid cord or a polyester cord.

内側ゴム層２、中間ゴム層６、外側ゴム層７を形成するゴムは、特に限定されるものではないが、スチレンブタジエンゴム（ＳＢＲ）、アクリロニトリルブタジエンゴム（ＮＢＲ）、クロロスルホン化ポリエチレン（ＣＳＭ）、エチレンプロピレンジエン三元共重合ゴム（ＥＰＤＭ）、ブチルゴム（ＩＩＲ）、塩素化ブチルゴム（Ｃｌ−ＩＩＲ）、臭素化ブチルゴム（Ｂｒ−ＩＩＲ）、ヒドリンゴム（ＣＨＲ、ＣＨＣ）、アクリルゴム（ＡＣＭ）、クロロプレンゴム（ＣＲ）等を例示することができる。   The rubber forming the inner rubber layer 2, the intermediate rubber layer 6, and the outer rubber layer 7 is not particularly limited, but styrene butadiene rubber (SBR), acrylonitrile butadiene rubber (NBR), 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), chloroprene A rubber (CR) etc. can be illustrated.

内側ゴム層２、中間ゴム層６、外側ゴム層７それぞれに、これらゴムのうち同種のゴムを用いることもでき、互いに異なるゴム種にすることもできる。各ゴム層の層厚は、要求性能によって異なるが、内側ゴム層２および外側ゴム層７の層厚は例えば、０．５ｍｍ〜２．５ｍｍ程度、中間ゴム層６の層厚は０．１ｍｍ〜０．８ｍｍ程度にする。   Of these rubbers, the same type of rubber can be used for the inner rubber layer 2, the intermediate rubber layer 6, and the outer rubber layer 7, respectively, and different rubber types can be used. The layer thickness of each rubber layer varies depending on the required performance, but the inner rubber layer 2 and the outer rubber layer 7 have a layer thickness of, for example, about 0.5 mm to 2.5 mm, and the intermediate rubber layer 6 has a layer thickness of 0.1 mm to Set to about 0.8 mm.

間挿布層３は、所定幅のテープ状の間挿布３ａを１枚または複数枚積層して一部をオーバラップさせて内側ゴム層２の外周面にスパイラル状に巻付けて形成されている。間挿布３ａは、例えばポリエチレンテレフタレート等のポリエステル繊維やナイロン６、ナイロン６６等のポリアミド繊維を縦糸３ｂとして、横糸には縦糸３ｂと同じ繊維或いは異なる繊維を織り込んだ格子状等の織物やこれら繊維の編物から形成される。   The intercalation cloth layer 3 is formed by laminating one or a plurality of tape-shaped intercalation cloths 3a having a predetermined width and overlapping a part thereof, and winding the spirally around the outer peripheral surface of the inner rubber layer 2. Yes. The interstitial cloth 3a includes, for example, polyester fibers such as polyethylene terephthalate and polyamide fibers such as nylon 6 and nylon 66 as warp yarns 3b, and weft yarns in the form of a lattice or the like in which the same or different fibers as the warp yarns 3b are woven. Formed from a knitted fabric.

この間挿布３ａがその長手方向を、コード補強層４、５のうち内側から第１番目のコード補強層４の補強コード４ａと逆方向にスパイラル状に交差するように巻付けられているので、補強コード４ａが内側ゴム層２に大きく棚落ちすることがない。そのため、局部的に補強コード４ａの配列が乱れることがなく、この補強機能を十分に発揮して高圧ホース１を均一に補強する。   Since this interim cloth 3a is wound so that its longitudinal direction intersects spirally in the opposite direction to the reinforcement cord 4a of the first cord reinforcement layer 4 from the inside of the cord reinforcement layers 4 and 5, The reinforcing cord 4a is not greatly dropped on the inner rubber layer 2. For this reason, the arrangement of the reinforcing cords 4a is not locally disturbed, and the reinforcing function is sufficiently exhibited to reinforce the high-pressure hose 1 uniformly.

さらに、間挿布３ａの厚さＧ（ｍｍ）、長手方向の強力Ｔ（Ｎ／３ｃｍ）および単位質量Ｗ（ｇ／ｍ２）を、間挿布３ａの積層数をｎとした下記（１）、（２）および（３）式を満足する範囲にしている。尚、間挿布３ａの厚さＧ、単位質量Ｗは、ＪＩＳ Ｌ１０１８：１９９９の規定に基づいて測定したものである。 Further, the thickness G (mm), the strength T (N / 3 cm) in the longitudinal direction, and the unit mass W (g / m 2 ) of the intercalating cloth 3a are represented by the following (1 ), (2) and (3). In addition, the thickness G and the unit mass W of the intercalation cloth 3a are measured based on the regulation of JIS L1018: 1999.

間挿布３ａの長手方向の強力Ｔの測定は、このＪＩＳ Ｌ１０１８：１９９９に準拠して、定速緊張形引張り試験機を用いたカットストリップ法により行ない、その際の試験片の大きさは幅３ｃｍ、長さ４０ｃｍ、つかみ間隔を２５ｃｍ、引張速度を３０ｃｍ／ｍｉｎとした。
０．１０≦ｎ×Ｇ≦０．７０ ・・・（１）
３５≦ｎ×Ｔ≦３００ ・・・（２）
１５≦ｎ×Ｗ≦１６０ ・・・（３） The strength T in the longitudinal direction of the intercalation cloth 3a is measured by the cut strip method using a constant speed tension type tensile tester in accordance with JIS L1018: 1999. The size of the test piece at that time is the width. The length was 3 cm, the length was 40 cm, the holding interval was 25 cm, and the tensile speed was 30 cm / min.
0.10 ≦ n × G ≦ 0.70 (1)
35 ≦ n × T ≦ 300 (2)
15 ≦ n × W ≦ 160 (3)

このように、間挿布３ａの積層数ｎで特定される間挿布３ａの厚さＧと強力Ｔとを規定するとともに、単位質量Ｗを規定することにより内側ゴム層２に第１番目のコード補強層４の補強コード４ａが間挿布層３を介して厚さ方向に適度に均等に食い込んで内側ゴム層２が補強される。また、内側ゴム層２、間挿布層３、第１番目のコード補強層４それぞれの層間の接着力が向上し、耐久性および耐圧性に優れた高圧ホース１を得ることができる。   As described above, the thickness G and the strength T of the intercalation cloth 3a specified by the number n of the intercalation cloths 3a are defined, and by defining the unit mass W, the first rubber layer 2 has a first thickness. The reinforcing cord 4a of the cord reinforcing layer 4 bites in the thickness direction moderately and uniformly through the intercalating cloth layer 3, and the inner rubber layer 2 is reinforced. Moreover, the adhesive strength between each of the inner rubber layer 2, the intercalating cloth layer 3, and the first cord reinforcing layer 4 is improved, and the high-pressure hose 1 having excellent durability and pressure resistance can be obtained.

また、この間挿布３ａの長手方向の乾熱収縮率は、１．５％以上４．０％以下に設定されている。この乾熱収縮率とは、１５０℃の乾燥機中で３０分間乾燥させた後の寸法変化をＪＩＳ Ｌ１９０９：２００５の規定に基づいて測定したものである。   Further, the dry heat shrinkage rate in the longitudinal direction of the intercalation cloth 3a is set to 1.5% or more and 4.0% or less. The dry heat shrinkage is a value obtained by measuring a dimensional change after drying for 30 minutes in a dryer at 150 ° C. based on the provisions of JIS L1909: 2005.

この設定範囲に乾熱収縮率を設定するために、例えば、間挿布３ａを内側ゴム層２に巻付ける前に、いわゆるディッピングにより接着樹脂に浸漬させた後、幅方向に所定のテンションを負荷した状態のまま乾燥させて乾熱収縮率を調整することができる。この方法によれば、付与するテンションの大きさを変えることにより任意に乾熱収縮率を調整し、所望の値に設定することができる。   In order to set the dry heat shrinkage rate in this setting range, for example, before winding the intercalating cloth 3a around the inner rubber layer 2, after immersing it in an adhesive resin by so-called dipping, a predetermined tension is applied in the width direction. The dry heat shrinkage rate can be adjusted by drying in a dried state. According to this method, it is possible to arbitrarily adjust the dry heat shrinkage rate by changing the magnitude of the tension to be applied and set it to a desired value.

この高圧ホース１は、例えば、従来のゴムホースの製造方法のようにマンドレルに内側ゴム層２となるゴム部材を被覆し、順次、間挿布層３、第１番目のコード補強層４、中間ゴム層６、第２番目のコード補強層５、外側ゴム層７となる部材を外周に積層し、これを加硫して製造することができる。   The high-pressure hose 1 is formed by, for example, covering a mandrel with a rubber member that becomes the inner rubber layer 2 as in a conventional rubber hose manufacturing method, and sequentially inserting an intercalating cloth layer 3, a first cord reinforcing layer 4, and an intermediate rubber. The members to be the layer 6, the second cord reinforcing layer 5, and the outer rubber layer 7 are laminated on the outer periphery and vulcanized.

この加硫工程において、長手方向の乾熱収縮率を１．５％以上４．０％以下に設定した間挿布３ａが熱収縮することにより、図２に例示するように、適度に内側ゴム層２に食い込むようになる。尚、図２は第１番目のコード補強層４よりも外周側の構成要素を省略して模式的に図示した正面図である。間挿布３ａの乾熱収縮率を上記の範囲に規定しているので断面方向において、ほぼ円状に均一に熱収縮し、これに伴い第１番目のコード補強層４の補強コード４ａが厚さ方向に大きく乱れることなく、断面方向において、ほぼ円状の配列が維持される。   In this vulcanization step, the inner cloth 3a is thermally shrunk while the dry heat shrinkage in the longitudinal direction is set to 1.5% to 4.0%, so that, as illustrated in FIG. It begins to bite into layer 2. FIG. 2 is a front view schematically showing the components on the outer peripheral side of the first cord reinforcing layer 4 by omitting them. Since the dry heat shrinkage rate of the intercalation cloth 3a is defined within the above range, the heat shrinkage is substantially uniform in a circular shape in the cross-sectional direction, and the reinforcement cord 4a of the first cord reinforcement layer 4 is thick accordingly. A substantially circular arrangement is maintained in the cross-sectional direction without significant disturbance in the vertical direction.

このように食い込んだ間挿布３ａ（間挿布層３）により内側ゴム層２が補強されるとともに、内側ゴム層２と第１番目のコード補強層４との間の剛性差が小さくなる。したがって、図３に例示するように高圧ホース１をニップル等の継手金具８に取付けて外周を加締め金具９により加締めて接続した場合に、間挿布３ａにより補強された内側ゴム層２とコード補強層４との間に生じる圧縮応力が分散、緩和され、内側ゴム層２の変形が抑制される。   The inner rubber layer 2 is reinforced by the intercalated cloth 3a (intercalated cloth layer 3) thus digging in, and the rigidity difference between the inner rubber layer 2 and the first cord reinforcing layer 4 is reduced. Therefore, when the high-pressure hose 1 is attached to a joint fitting 8 such as a nipple and the outer periphery is swaged by a crimping fitting 9 as shown in FIG. 3, the inner rubber layer 2 reinforced by the intercalating cloth 3a The compressive stress generated between the cord reinforcing layer 4 is dispersed and relaxed, and the deformation of the inner rubber layer 2 is suppressed.

そのため、高圧ホース１が強く加締められた場合であっても図３の二点鎖線で示すように、内側ゴム層２がはく離して内周側に盛り上がる不具合（チューブバルジ現象）を防ぐことができ、内側ゴム層２とコード補強層４とのはく離をより確実に防止でき、耐久性を一層向上させることが可能になる。これにより、高圧ホース１を内部を流通する流体の高圧化に対応させることができる。   Therefore, even when the high-pressure hose 1 is strongly crimped, as shown by a two-dot chain line in FIG. 3, the inner rubber layer 2 is peeled off to prevent a problem (tube bulge phenomenon) that rises to the inner peripheral side. It is possible to more reliably prevent the inner rubber layer 2 and the cord reinforcing layer 4 from being peeled off and to further improve the durability. Thereby, the high pressure hose 1 can be made to correspond to the high pressure of the fluid which distribute | circulates an inside.

内側ゴム層と外側ゴム層との間に４層のスパイラル巻きのスチールコードで形成されたコード補強層をそれぞれ中間ゴム層を介挿して、内側ゴム層と内側から第１番目のコード補強層との間に間挿布層を配置して構成した高圧ホース試験サンプルを間挿布層の仕様のみを表１のように変えて１２種類（実施例１〜６、比較例１〜６）製造した。尚、すべての試験サンプルの内側ゴム層はＳＢＲとＮＢＲとのブレンドゴム、外側ゴム層はＣＲとＳＢＲとのブレンドゴム、中間ゴム層はＣＲとした。また、いずれの間挿布層もナイロン６からなる繊維を格子状に編んだ間挿布により形成したものである。   Between the inner rubber layer and the outer rubber layer, cord reinforcement layers formed of four layers of spiral wound steel cords are respectively inserted, and an intermediate rubber layer is interposed between the inner rubber layer and the first cord reinforcement layer from the inside. 12 types (Examples 1 to 6 and Comparative Examples 1 to 6) of high-pressure hose test samples constructed by arranging an intercalation cloth layer between them were changed as shown in Table 1 only. . The inner rubber layer of all the test samples was a blend rubber of SBR and NBR, the outer rubber layer was a blend rubber of CR and SBR, and the intermediate rubber layer was CR. In addition, each intercalation layer is formed by intercalation cloth in which fibers made of nylon 6 are knitted in a lattice shape.

これら１２種類の試験サンプルについて、コード並び具合および耐バルジ性を評価し、その結果を表１に示す。表１のコード並び具合とは、第１番目のコード補強層の補強コードの厚さ方向の凹凸具合であり、断面方向において円状にほぼ均一に配列して実使用において問題のないレベルの場合を○、実使用に問題がないが凹凸具合がやや大きい場合を△で示した。また表１の耐バルジ性とは、試験サンプルの一端部をニップルに取付けて外周を加締め金具により所定の一定の力で加締めた場合の内側ゴム層と第１番目のコード補強層との接着状態を１２０℃に加温した後に評価したもので、内側ゴム層の変形がほとんどなく接着状態が良好な場合を○、内側ゴム層が変形して内周側に盛り上がり、第１番目のコード補強層との間に若干のはく離が生じている場合を△で示した。このコード並び具合と耐バルジ性の両方が○の場合を判定として○で示し、それ以外の場合を△で示した。   These 12 types of test samples were evaluated for code alignment and bulge resistance, and the results are shown in Table 1. The cord arrangement in Table 1 is the degree of unevenness in the thickness direction of the reinforcement cord of the first cord reinforcement layer, in a level where there is no problem in actual use by arranging it almost uniformly in a circular shape in the cross-sectional direction. ◯, and a case where there is no problem in actual use but the unevenness is slightly large is indicated by △. Also, the bulge resistance in Table 1 is the relationship between the inner rubber layer and the first cord reinforcing layer when one end of the test sample is attached to the nipple and the outer periphery is caulked with a predetermined constant force using caulking metal fittings. It was evaluated after the adhesive state was heated to 120 ° C. The case where the inner rubber layer was hardly deformed and the adhesive state was good was good. The inner rubber layer was deformed and raised to the inner peripheral side. A case where some peeling occurs between the reinforcing layer and the reinforcing layer is indicated by Δ. A case where both the code arrangement and the bulge resistance were ○ was indicated by ○, and other cases were indicated by Δ.

Figure 0004967589
Figure 0004967589

表１の結果から間挿布の長手方向（縦糸方向）の乾熱収縮率を１．５％以上４．０％以下に設定し、間挿布の厚さＧ（ｍｍ）、長手方向の強力Ｔ（Ｎ／３ｃｍ）および単位質量Ｗ（ｇ／ｍ２）を、間挿布の積層数をｎとした上記の（１）〜（３）式を満たすようにした実施例１〜６の試験サンプルでは、第１番目のコード補強層の補強コードの厚さ方向の乱れが小さく、内側ゴム層と第１番目のコード補強層との接着状態も良好であることが確認できた。 From the results in Table 1, the dry heat shrinkage rate in the longitudinal direction (warp direction) of the intercalation cloth is set to 1.5% to 4.0%, the thickness G (mm) of the intercalation cloth, and the strength in the longitudinal direction Tests of Examples 1 to 6 satisfying the above formulas (1) to (3) where T (N / 3 cm) and unit mass W (g / m 2 ) are set to n as the number of interleaved layers stacked. In the sample, it was confirmed that the disturbance in the thickness direction of the reinforcing cord of the first cord reinforcing layer was small, and the adhesion state between the inner rubber layer and the first cord reinforcing layer was also good.

本発明により製造される高圧ホースを一部切開して例示する斜視図である。 It is a perspective view which illustrates a high-pressure hose manufactured by the present invention by partially cutting it. 図１の高圧ホースの一部を省略して模式的に示す正面図である。It is a front view which abbreviate | omits a part of high-pressure hose of FIG. 1, and is shown typically. 図１の高圧ホースの金具加締め部を示す拡大断面図である。It is an expanded sectional view which shows the metal fitting crimping part of the high pressure hose of FIG.

符号の説明Explanation of symbols

１ 高圧ホース
２ 内側ゴム層
３ 間挿布層 ３ａ 間挿布 ３ｂ 縦糸
４ 第１番目のコード補強層 ４ａ 補強コード
５ 第２番面のコード補強層 ５ａ 補強コード
６ 中間ゴム層
７ 外側ゴム層
８ 継手金具
９ 加締め金具 DESCRIPTION OF SYMBOLS 1 High pressure hose 2 Inner rubber layer 3 Intercalation cloth layer 3a Intercalation cloth 3b Warp thread 4 1st cord reinforcement layer 4a Reinforcement cord 5 Cord reinforcement layer of the 2nd surface 5a Reinforcement cord 6 Intermediate rubber layer 7 Outer rubber layer 8 Fitting bracket 9 Clamp bracket

Claims (3)

内側ゴム層と外側ゴム層との間に補強コードをスパイラル状に巻回した少なくとも１層のコード補強層を配置し、内側から第１番目のコード補強層と前記内側ゴム層との間に間挿布層を配置し、該間挿布層をテープ状の間挿布をその長手方向が前記第１番目のコード補強層の補強コードと交差するように逆方向にスパイラル状に巻回して形成するとともに、該間挿布の厚さＧ（ｍｍ）、該間挿布の長手方向の強力Ｔ（Ｎ／３ｃｍ）および該間挿布の単位質量Ｗ（ｇ／ｍ2）を、該間挿布の積層数をｎとした下記（１）、（２）および（３）式を満足する範囲にした高圧ホースの製造方法であって、前記間挿布の長手方向の乾熱収縮率を１．５％以上４．０％以下に設定し、マンドレルに順次、前記高圧ホースの構成部材を外周に積層し、これを加硫して高圧ホースを製造し、加硫工程において、前記間挿布が熱収縮することにより前記内側ゴム層に食い込ませる高圧ホースの製造方法。
０．１０≦ｎ×Ｇ≦０．７０ ・・・（１）
３５≦ｎ×Ｔ≦３００ ・・・（２）
１５≦ｎ×Ｗ≦１６０ ・・・（３） At least one cord reinforcing layer in which a reinforcing cord is wound in a spiral shape is disposed between the inner rubber layer and the outer rubber layer, and between the first cord reinforcing layer from the inner side and the inner rubber layer. An insertion layer is arranged, and the intervening layer is formed by winding a tape-like interim cloth in a spiral shape in the reverse direction so that the longitudinal direction intersects the reinforcing cord of the first cord reinforcing layer 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 A method of manufacturing a high-pressure hose in which the number of fabric layers is n and satisfies the following formulas (1), (2) and (3), wherein the dry heat shrinkage in the longitudinal direction of the intercalation cloth is 1 set below 4.0% .5% or more, sequentially mandrel, laminated on the outer circumference of the components of the high-pressure hose, which To produce a high pressure hose by vulcanizing, in a vulcanization step, a manufacturing method of a high-pressure hose to bite into the inner rubber layer by the inter挿布is thermally contracted.
0.10 ≦ n × G ≦ 0.70 (1)
35 ≦ n × T ≦ 300 (2)
15 ≦ n × W ≦ 160 (3) 前記間挿布が、接着樹脂に浸漬された後に幅方向にテンションを負荷した状態で乾燥されることにより長手方向の乾熱収縮率を前記設定範囲に調節したものである請求項１に記載の高圧ホースの製造方法。 2. The dry heat shrinkage in the longitudinal direction is adjusted to the set range by drying the intercalating cloth after being immersed in an adhesive resin and applying a tension in the width direction. A method for manufacturing a high-pressure hose . 前記補強コードがスチールコードである請求項１または２に記載の高圧ホースの製造方法。 The method for manufacturing a high-pressure hose according to claim 1, wherein the reinforcing cord is a steel cord.
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