JPH0514152B2 - - Google Patents
Info
- Publication number
- JPH0514152B2 JPH0514152B2 JP62140666A JP14066687A JPH0514152B2 JP H0514152 B2 JPH0514152 B2 JP H0514152B2 JP 62140666 A JP62140666 A JP 62140666A JP 14066687 A JP14066687 A JP 14066687A JP H0514152 B2 JPH0514152 B2 JP H0514152B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- rubber
- hose
- brake
- epdm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229920001971 elastomer Polymers 0.000 claims description 70
- 239000005060 rubber Substances 0.000 claims description 70
- 239000000835 fiber Substances 0.000 claims description 40
- 230000035699 permeability Effects 0.000 claims description 18
- 229920005555 halobutyl Polymers 0.000 claims description 15
- 229920002943 EPDM rubber Polymers 0.000 claims description 13
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 11
- 230000002787 reinforcement Effects 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 230000003014 reinforcing effect Effects 0.000 description 8
- 229920002978 Vinylon Polymers 0.000 description 5
- 229920001084 poly(chloroprene) Polymers 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000012466 permeate Substances 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 238000011109 contamination Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 244000043261 Hevea brasiliensis Species 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 229920000297 Rayon Polymers 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920003052 natural elastomer Polymers 0.000 description 2
- 229920001194 natural rubber Polymers 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 239000002964 rayon Substances 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 238000011041 water permeability test Methods 0.000 description 1
Description
［産業上の利用分野］
本発明は低透過性ブレーキホースに関するもの
である。更に詳述すれば本発明は外界雰囲気の水
分がホース内に透過する量が極めて少ない低透過
性ブレーキホースに関するものである。
［従来の技術］
ブレーキホースは自動車の制動に係る重要な保
安部品である。
ブレーキホースは車両本体とホイールキヤリパ
ー部とを結ぶ油圧伝達ホースとして用いられてい
る。このホイールキヤリパー部は自動車の中で最
も機械的ストレスを受ける箇所である。このため
ブレーキホースは苛酷な程の繰返しの機械的スト
レス、例えば衝撃、曲げ、応力、伸び等を受け
る。
従つて、ブレーキホースは繰返しの機械的スト
レスと耐油性とが優れていることが不可欠であ
り、このため可撓性と耐油性が優れたゴム材料を
主体としたものから製造されている。
即ち、ブレーキホースは内層に耐油性が優れた
ゴムを用い、その内層ゴムの上層に第１繊維補強
層、その上層に中間ゴム層、更にその上層に第２
繊維補強層、最外層に外層ゴム層を順次設けて成
るものである。
従来のブレーキホースは、内層ゴムとして耐油
性に優れたスチレンブタジエンゴム、第１繊維補
強層と第２繊維補強層には補強性に優れたポリア
ミド繊維、ポリエステル繊維、レーヨン繊維、ビ
ニロン繊維等の編組層、中間ゴム層には第１繊維
補強層と第２繊維補強層との接着性がよく、しか
も耐疲労性が優れた天然ゴム、そして外層ゴム層
には耐候性と機械的特性が優れたクロロプレンゴ
ム又はクロロプレンゴムを主体としたブレンドゴ
ム等が用いられている。
［発明が解決しようとする課題］
しかしながらこの様な構成から成る従来のブレ
ーキホースは、高温多湿の気象条件下でかなり長
期間使用したときに大気中の水分が外層ゴム層、
第１繊維補強層、中間ゴム層、第２繊維補強層お
よび内層ゴム層を透過してホース内のブレーキ液
に溶解し、ベーパーロツク現象を起こすことがわ
かつてきた。ベーパーロツク現象を起こしたブレ
ーキ液は制動特性が極端に低下し、自動車の安全
走行性を著しく損うものである。
本発明はかかる点に立つて為されたものであつ
て、その目的とするところは、前記した従来技術
の欠点を解消し、水分透過量が格段に少ない低透
過性ブレーキホースを提供することにある。
［課題を解決するための手段］
本発明の要旨とするところは、内層ゴムの上層
に第１繊維補強層、その第１繊維補強層の上層に
中間ゴム層、その中間ゴム層の上層に第２繊維補
強層、更に第２繊維補強層の上層に外層ゴムがあ
るブレーキホースにおいて、内層ゴムはEPDM
から成り、中間ゴム層はEPDM／ハロゲン化ブ
チルゴム＝７／３〜０／10重量比のゴムから成り
且つその厚さが0.05〜0.5mmであることを特徴と
する低透過性ブレーキホースにある。
本発明において、内層ゴム層として用いる
EPDMは、工業的に用いられるエチレンプロピ
レンジエン系ゴムなら特に限定されないが、水分
透過抑止性と耐寒性の点からはエチレン分が40〜
60重量％、ヨウ素価が10〜30、第３成分がENB
型のものが適切である。
また、第１繊維補強層と第２繊維補強層は補強
性に優れた繊維、例えば従来のポリアミド繊維、
ポリエステル繊維、レーヨン繊維、ビニロン繊維
等の編組物を用いることができる。
本発明において、中間ゴム層はEPDM／ハロ
ゲン化ブチルゴム＝７／３〜０／10重量比のゴム
から成るものである。ここにおいてEPDM／ハ
ロゲン化ブチルゴム＝７／３〜０／10重量比のゴ
ムに限定したのは、第１繊維補強層と第２繊維補
強層との接着性、低温下における耐疲労性、水分
透過抑止性の３特性が最も優れているからであ
る。
ここにおいてハロゲン化ブチルゴムにブレンド
するゴムをEPDMに限定したのは、ブチルゴム
にブレンドした時、水分透過抑止性が効果的に小
さくなるからである。即ち、EPDM／ハロゲン
化ブチルゴム＝７／３〜０／10重量比のゴムにお
いて、EPDMが８以上では第１繊維補強層と第
２繊維補強層との接着性及び低温下における耐疲
労性が急激に低下し、その結果中間層の水分透過
抑止性が極端に劣るようになるためである。勿
論、本発明において中間ゴム層はハロゲン化ブチ
ルゴム単独でもよい。
更に、本発明においてEPDM／ハロゲン化ブ
チルゴム＝７／３〜０／10重量比のゴムから成る
中間ゴム層の厚さを0.05〜0.5mmとしたのは、厚
さが0.05mm以下では意外にも水分透過量が急激に
大きくなり、その上カレンダーロール加工性が悪
くて均一なゴムシートが得られないためである。
逆に、中間ゴム層の厚さが0.5mm以上では意外に
もホースの可撓性が低下し且つ水分透過量の低減
が厚さに比例せずしかも相対的に内層ゴム層を薄
くなつて、その結果水分透過性が大きくなると共
にブレーキ液との適合性も劣るようになるためで
ある。
本発明において、外層ゴムとしては耐候性と機
械的特性が優れたゴムならよく、例えばクロロプ
レンゴム又はクロロプレンゴムを主体としたブレ
ンドゴム等を用いることができる。
［作用］
本発明の低透過性ブレーキホースは、第１に内
層ゴムの上層に第１繊維補強層、その第１繊維補
強層の上層に中間ゴム層、その中間ゴム層の上層
に第２繊維補強層、更に第２繊維補強層の上層に
外層ゴムがあるブレーキホースとすることによ
り、ブレーキホースとしての基本的特性を確保
し、第２にその内層ゴムにはEPDMを用いるこ
とにより水分透過抑止性、ブレーキ液汚染防止性
およびブレーキ液透過抑止性を顕著に改善し、第
３に中間ゴム層としてEPDM／ハロゲン化ブチ
ルゴム＝７／３〜０／10重量比のゴムを厚さ0.05
〜0.5mmとして用いることにより、第１繊維補強
層と第２繊維補強層との接着性、耐疲労性及び水
分透過抑止性を顕著に改善し、その結果これらの
構成要素が相乗的に作用して水分透過量が顕著に
少ない高信頼性ブレーキホースを得たものであ
る。
［実施例］
次に、本発明の低透過性ブレーキホースの一実
施例を図面により説明する。
第１図は本発明の低透過性ブレーキホースの一
実施例を示した斜視図である。
第１図において、２０はEPDMから成る内層
ゴム層、２はビニロン繊維の編組から成る第１繊
維補強層、２１はEPDM／ハロゲン化ブチルゴ
ム＝７／３〜０／10重量比のゴムから成る中間ゴ
ム層、４はビニロン繊維の編組から成る第２繊維
補強層、５はクロロプレンゴムから成る外層ゴム
層である。
第１表は第１繊維補強層と第２繊維補強層をビ
ニロン繊維の編組層として内層ゴムの材料、中間
ゴム層の材料を変えてブレーキホースを製造し、
得られたブレーキホースの特性を試験した結果を
示したものである。
[Industrial Field of Application] The present invention relates to a low permeability brake hose. More specifically, the present invention relates to a low permeability brake hose in which an extremely small amount of moisture from the outside atmosphere permeates into the hose. [Prior Art] Brake hoses are important safety parts related to braking of automobiles. The brake hose is used as a hydraulic pressure transmission hose that connects the vehicle body and the wheel caliper. The wheel caliper is the part of the car that receives the most mechanical stress. For this reason, the brake hose is subjected to severe and repetitive mechanical stress, such as impact, bending, stress, elongation, etc. Therefore, it is essential that brake hoses have excellent resistance to repeated mechanical stress and oil, and for this reason, they are manufactured mainly from rubber materials that have excellent flexibility and oil resistance. In other words, the brake hose uses rubber with excellent oil resistance for the inner layer, a first fiber reinforced layer on top of the inner rubber layer, an intermediate rubber layer on top of that, and a second layer on top of that.
A fiber reinforced layer and an outer rubber layer are sequentially provided as the outermost layer. Conventional brake hoses use styrene-butadiene rubber with excellent oil resistance as the inner rubber layer, and braided polyamide fibers, polyester fibers, rayon fibers, vinylon fibers, etc. with excellent reinforcing properties in the first and second fiber reinforcing layers. The intermediate rubber layer is made of natural rubber, which has good adhesion between the first fiber-reinforced layer and the second fiber-reinforced layer, and has excellent fatigue resistance, and the outer rubber layer is made of natural rubber, which has excellent weather resistance and mechanical properties. Chloroprene rubber or a blend rubber mainly composed of chloroprene rubber is used. [Problems to be Solved by the Invention] However, when a conventional brake hose with such a configuration is used for a considerable period of time under hot and humid weather conditions, moisture in the atmosphere can cause damage to the outer rubber layer.
It has been found that it permeates through the first fiber reinforced layer, intermediate rubber layer, second fiber reinforced layer and inner rubber layer and dissolves in the brake fluid in the hose, causing a vapor lock phenomenon. Brake fluid that has developed a vapor lock phenomenon has extremely poor braking characteristics, which significantly impairs the safe driving performance of an automobile. The present invention has been made in view of this point, and its purpose is to eliminate the drawbacks of the prior art described above and to provide a low permeability brake hose that has a significantly lower amount of water permeation. be. [Means for Solving the Problems] The gist of the present invention is to provide a first fiber-reinforced layer above the inner rubber layer, an intermediate rubber layer above the first fiber-reinforced layer, and a first fiber-reinforced layer above the first fiber-reinforced layer. In a brake hose that has two fiber reinforced layers and an outer layer of rubber on top of the second fiber reinforced layer, the inner layer rubber is EPDM.
The low permeability brake hose is characterized in that the middle rubber layer is made of EPDM/halogenated butyl rubber in a weight ratio of 7/3 to 0/10 and has a thickness of 0.05 to 0.5 mm. In the present invention, used as an inner rubber layer
EPDM is not particularly limited as long as it is an industrially used ethylene propylene diene rubber, but from the viewpoint of moisture permeation prevention and cold resistance, the ethylene content is 40 to 40%.
60% by weight, iodine value 10-30, third component is ENB
Types are appropriate. In addition, the first fiber reinforced layer and the second fiber reinforced layer are made of fibers with excellent reinforcing properties, such as conventional polyamide fibers,
Braided materials such as polyester fiber, rayon fiber, vinylon fiber, etc. can be used. In the present invention, the intermediate rubber layer is made of rubber having a weight ratio of EPDM/halogenated butyl rubber of 7/3 to 0/10. Here, we limited the rubber with a weight ratio of EPDM/halogenated butyl rubber = 7/3 to 0/10 to improve adhesion between the first fiber reinforced layer and the second fiber reinforced layer, fatigue resistance at low temperatures, and moisture permeability. This is because the three deterrent properties are the best. The reason why the rubber to be blended with the halogenated butyl rubber is limited to EPDM is that when blended with butyl rubber, the moisture permeation inhibiting property is effectively reduced. That is, in a rubber with a weight ratio of EPDM/halogenated butyl rubber = 7/3 to 0/10, when EPDM is 8 or more, the adhesion between the first fiber reinforced layer and the second fiber reinforced layer and the fatigue resistance at low temperatures suddenly decrease. This is because the moisture permeation inhibiting properties of the intermediate layer become extremely poor. Of course, in the present invention, the intermediate rubber layer may be made of halogenated butyl rubber alone. Furthermore, in the present invention, the thickness of the intermediate rubber layer made of rubber with a weight ratio of EPDM/halogenated butyl rubber = 7/3 to 0/10 is set to 0.05 to 0.5 mm, because unexpectedly, if the thickness is 0.05 mm or less, This is because the amount of water permeation increases rapidly, and furthermore, the processability with a calendar roll is poor, making it impossible to obtain a uniform rubber sheet.
On the other hand, when the thickness of the intermediate rubber layer is 0.5 mm or more, the flexibility of the hose unexpectedly decreases, and the reduction in water permeation is not proportional to the thickness, and the inner rubber layer becomes relatively thin. As a result, moisture permeability increases and compatibility with brake fluid also deteriorates. In the present invention, the outer layer rubber may be any rubber having excellent weather resistance and mechanical properties, such as chloroprene rubber or a blend rubber mainly composed of chloroprene rubber. [Function] The low permeability brake hose of the present invention first has a first fiber-reinforced layer on the inner rubber layer, an intermediate rubber layer on the first fiber-reinforced layer, and a second fiber on the upper layer of the intermediate rubber layer. By creating a brake hose with an outer rubber layer on top of the reinforcing layer and the second fiber reinforcing layer, the basic characteristics of a brake hose are ensured, and secondly, by using EPDM for the inner layer rubber, moisture permeation is inhibited. Thirdly, the intermediate rubber layer is made of rubber with a weight ratio of EPDM/halogenated butyl rubber = 7/3 to 0/10 to a thickness of 0.05.
~0.5mm, the adhesion, fatigue resistance, and moisture permeation prevention properties between the first fiber reinforced layer and the second fiber reinforced layer are significantly improved, and as a result, these components act synergistically. As a result, a highly reliable brake hose with a significantly lower amount of moisture permeation was obtained. [Example] Next, an example of the low permeability brake hose of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the low permeability brake hose of the present invention. In FIG. 1, 20 is an inner rubber layer made of EPDM, 2 is a first fiber reinforcing layer made of braided vinylon fibers, and 21 is an intermediate layer made of rubber with a weight ratio of EPDM/halogenated butyl rubber of 7/3 to 0/10. The rubber layer 4 is a second fiber reinforced layer made of braided vinylon fibers, and 5 is an outer rubber layer made of chloroprene rubber. Table 1 shows brake hoses manufactured by using the first fiber reinforcing layer and the second fiber reinforcing layer as braided layers of vinylon fibers, and changing the material of the inner layer rubber and the material of the intermediate rubber layer.
This figure shows the results of testing the characteristics of the obtained brake hose.
【表】
なお、試験方法は次のように行なつた。
(1) 水分透過性試験法
両端に金具を付けた長さ305mmのホースを用意
し、100℃24時間予備乾燥し、冷却後ホース内に
ブレーキ液を入れ、それから両端の金具を密封し
た試料とする。次に、かくして得た試料を70℃の
蒸溜水に72hrs浸漬する。最後に、試料のブレー
キ液を採取し、ブレーキ液中に溶解した水分をカ
ールフイツシヤー法にて測定した。水分透過性の
評価は比較例１のホースの水分量を１としたとき
の比較値で示した。
(2) ブレーキ液透過性試験法
両端に金具を付けた長さ200mmのホースを用意
し、そのホース内へブレーキ液を入れ、両端を密
封した試料とする。次に、かくして得た試料の重
量W0を秤量し、それから70℃の乾燥器内に
168hrs放置する。取出し後、試料の重量W1を秤
量し、W1−W0の差を透過量として求める。ブレ
ーキ液透過性の評価は比較例１の透過量を１とし
たときの比較値で示した。
(3) ブレーキ液汚染抑止性
(1)の水分透過性試験をした後、試料内のブレー
キ液を取り出し、ブレーキ液の変色、沈殿物、浮
遊物等を目視検査した。ブレーキ液汚染抑止性は
抑止効果が大のものを◎、やや効果があるものを
△、抑止効果がないものを×で示した。
第１表から明らかなように、従来のブレーキホ
ースである比較例１は促進試験条件下において大
気中の水分が多量にホース内に透過し、その水分
がブレーキ液中に溶解する。
又、従来のブレーキホースの構成において、内
層ゴム層だけをEPDMとした比較例３、或いは
中間ゴム層をハロゲン化ブチルゴムとした比較例
２のブレーキホースでは水分透過量を効果的に低
減できない。同じく、従来のブレーキホースの構
成において、内層ゴムと中間ゴム層をEPDMと
した比較例４のブレーキホースでも水分透過量を
効果的に低減できない。
更に、従来のブレーキホースの構成において、
中間ゴム層だけをEPDM／ハロゲン化ブチルゴ
ム＝８／２重量比のブレンドゴムを用いた比較例
５のブレーキホースでも水分透過量を同様に低減
できない。
これに対して内層ゴムをEPDM、中間ゴム層
をEPDM／ハロゲン化ブチルゴム＝７／３〜
０／10重量比のゴムとした実施例１〜３の本発明
の低透過性ブレーキホースは、水分透過量及びブ
レーキ液透過性が極めて少なく、ブレーキ液汚染
抑止性も良好である。
第２表は第１図のブレーキホースにおいて、中
間ゴム層２１の厚さを変えたブレーキホースを作
成し、その特性を評価したものである。[Table] The test method was as follows. (1) Moisture permeability test method Prepare a 305 mm long hose with metal fittings on both ends, pre-dry it at 100°C for 24 hours, cool it down, fill the hose with brake fluid, and then seal the metal fittings on both ends. do. Next, the sample thus obtained is immersed in distilled water at 70°C for 72 hours. Finally, a sample of brake fluid was collected, and the water dissolved in the brake fluid was measured using the Karl Fischer method. The moisture permeability was evaluated using a comparative value when the moisture content of the hose of Comparative Example 1 was set to 1. (2) Brake fluid permeability test method Prepare a 200mm long hose with metal fittings attached to both ends, fill the hose with brake fluid, and seal both ends to prepare a sample. Next, the weight W 0 of the sample thus obtained was weighed and then placed in a dryer at 70 °C.
Leave for 168hrs. After taking out the sample, the weight W 1 of the sample is weighed, and the difference between W 1 −W 0 is determined as the amount of permeation. Brake fluid permeability was evaluated using comparative values when the permeation amount of Comparative Example 1 was set to 1. (3) Brake fluid contamination prevention property After conducting the water permeability test in (1), the brake fluid in the sample was taken out and visually inspected for discoloration, sediment, floating matter, etc. of the brake fluid. Regarding brake fluid contamination deterrence, those with a large deterrent effect are indicated by ◎, those with a moderate effect are indicated by △, and those with no deterrent effect are indicated by ×. As is clear from Table 1, in Comparative Example 1, which is a conventional brake hose, a large amount of atmospheric moisture permeates into the hose under accelerated test conditions, and the moisture is dissolved in the brake fluid. Furthermore, in the conventional brake hose configuration, the amount of water permeation cannot be effectively reduced in the brake hose of Comparative Example 3 in which only the inner rubber layer is made of EPDM, or Comparative Example 2 in which the intermediate rubber layer is made of halogenated butyl rubber. Similarly, in the conventional brake hose configuration, the brake hose of Comparative Example 4 in which the inner rubber layer and the intermediate rubber layer were made of EPDM cannot effectively reduce the amount of water permeation. Furthermore, in the conventional brake hose configuration,
The brake hose of Comparative Example 5, in which only the intermediate rubber layer was made of a blended rubber with a weight ratio of EPDM/halogenated butyl rubber = 8/2, could not similarly reduce the amount of water permeation. On the other hand, the inner layer rubber is EPDM, and the middle rubber layer is EPDM/halogenated butyl rubber = 7/3 ~
The low-permeability brake hoses of Examples 1 to 3 using rubber at a weight ratio of 0/10 have extremely low moisture permeation and brake fluid permeability, and have good brake fluid contamination prevention properties. Table 2 shows the brake hoses shown in FIG. 1 in which the thickness of the intermediate rubber layer 21 was changed, and the characteristics of the brake hoses were evaluated.
【表】
なお、ブレーキ液適合性試験は次のように行な
つた。
両端に金具を付けた長さ200mmのホースを用意
し、そのホースをリザーバータンクに接続する。
それからホース内にブレーキ液を多目に入れ、封
管した試料とする。その試料を95℃72hrs熱処理
し、室温に冷却後リザーバータンクよりホースを
取外す。最後に、取外したホースに所定の水圧を
かけ、圧力に耐えられるか評価した。評価は十分
耐圧に耐えられるもの◎、規定耐圧に耐えられる
もの△、規定耐圧に耐えられないもの×印として
表示した。
表２からわかるように中間ゴム層のEPDM／
ハロゲン化ブチルゴム＝７／３〜０／10重量比の
ゴム層の厚さが0.02mmと薄い場合には意外にも水
分透過量が急激に大きくなり、しかもカレンダー
ロール加工性が悪く、逆に0.5mmより厚い場合に
はホース外径が必然的に太くなつたり、内層ゴム
層が相対的に薄くなり、その結果水分透過性が大
きくなると共にブレーキ液との適合性も劣るよう
になる。従つて中間ゴム層は、0.02〜0.5mmがよ
い。
［発明の効果］
本発明の低透過性ブレーキホースは、高温多湿
下でかなり長期間使用しても大気中の水分がホー
ス内に透過する量が顕著に少なく、その結果高信
頼性のブレーキホースが得られるものであり、工
業上有用である。[Table] The brake fluid compatibility test was conducted as follows. Prepare a 200mm long hose with metal fittings on both ends, and connect that hose to the reservoir tank.
Then, pour a large amount of brake fluid into the hose and seal it as a sample. The sample was heat treated at 95℃ for 72 hours, and after cooling to room temperature, the hose was removed from the reservoir tank. Finally, a predetermined water pressure was applied to the removed hose to evaluate whether it could withstand the pressure. The evaluation was shown as ◎ for those that could sufficiently withstand the withstand pressure, △ for those that could withstand the specified withstand pressure, and × marks for those that could not withstand the specified withstand voltage. As can be seen from Table 2, the EPDM of the intermediate rubber layer/
When the thickness of the rubber layer with a weight ratio of halogenated butyl rubber = 7/3 to 0/10 is as thin as 0.02 mm, the amount of water permeation increases unexpectedly, and the calender roll processability is poor; If it is thicker than mm, the outer diameter of the hose will inevitably become thicker and the inner rubber layer will become relatively thinner, resulting in increased moisture permeability and poor compatibility with brake fluid. Therefore, the intermediate rubber layer preferably has a thickness of 0.02 to 0.5 mm. [Effects of the Invention] The low permeability brake hose of the present invention allows significantly less moisture in the atmosphere to permeate into the hose even when used for a considerable period of time under high temperature and humidity, resulting in a highly reliable brake hose. is obtained and is industrially useful.
第１図は本発明の低透過性ブレーキホースの一
実施例を示した斜視図、第２図は従来のブレーキ
ホースの一例を示した斜視図である。
１……内層ゴム、２……第１繊維補強層、３…
…中間ゴム層、４……第２繊維補強層、５……外
層ゴム層、２０……EPDM層、２１……
EPDM／ハロゲン化ブチルゴム層。
FIG. 1 is a perspective view showing an embodiment of a low permeability brake hose of the present invention, and FIG. 2 is a perspective view showing an example of a conventional brake hose. 1... Inner layer rubber, 2... First fiber reinforced layer, 3...
...Intermediate rubber layer, 4...Second fiber reinforcement layer, 5...Outer rubber layer, 20...EPDM layer, 21...
EPDM/halogenated butyl rubber layer.
Claims (1)
第１繊維補強層の上層に中間ゴム層があり、該中
間ゴム層の上層に第２繊維補強層があり、該第２
繊維補強層の上層に外層ゴムがあるブレーキホー
スにおいて、前記内層ゴムはEPDMから成り、
前記中間ゴム層はEPDM／ハロゲン化ブチルゴ
ム＝７／３〜０／10重量比のゴムから成り且つそ
の厚さが0.05〜0.5mmであることを特徴とする低
透過性ブレーキホース。1. A first fiber reinforced layer is provided above the inner rubber layer, an intermediate rubber layer is provided above the first fiber reinforced layer, a second fiber reinforced layer is provided above the intermediate rubber layer, and the second fiber reinforced layer is provided above the intermediate rubber layer.
In a brake hose having an outer layer of rubber on top of the fiber reinforcement layer, the inner layer rubber is made of EPDM,
A low permeability brake hose characterized in that the intermediate rubber layer is made of rubber having a weight ratio of EPDM/halogenated butyl rubber of 7/3 to 0/10 and has a thickness of 0.05 to 0.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14066687A JPS63303288A (en) | 1987-06-04 | 1987-06-04 | Low permeable brake hose |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14066687A JPS63303288A (en) | 1987-06-04 | 1987-06-04 | Low permeable brake hose |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63303288A JPS63303288A (en) | 1988-12-09 |
| JPH0514152B2 true JPH0514152B2 (en) | 1993-02-24 |
Family
ID=15273937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14066687A Granted JPS63303288A (en) | 1987-06-04 | 1987-06-04 | Low permeable brake hose |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63303288A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006266442A (en) | 2005-03-25 | 2006-10-05 | Toyoda Gosei Co Ltd | Brake hose |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61206888A (en) * | 1985-03-08 | 1986-09-13 | 豊田合成株式会社 | High-pressure rubber hose |
-
1987
- 1987-06-04 JP JP14066687A patent/JPS63303288A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61206888A (en) * | 1985-03-08 | 1986-09-13 | 豊田合成株式会社 | High-pressure rubber hose |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63303288A (en) | 1988-12-09 |
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