JP3798086B2 - Connection structure between thin-walled thin metal tube and pressure-resistant rubber hose and connection method thereof - Google Patents
Connection structure between thin-walled thin metal tube and pressure-resistant rubber hose and connection method thereof Download PDFInfo
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【０００１】
【発明の属する技術分野】
本発明は一般に自動車或いは各種の機械、装置などに給油、給気の供給路として配設される管径２０ｍ／ｍ程度以下の比較的薄肉細径からなる金属管と、外側を金属細線によって編組された耐圧ゴムホースとの接続構造およびその接続方法に関するものである。
【０００２】
【従来の技術】
従来、この種の接続構造およびその接続方法としては一般に図７に示すように、金属管（Ｐ１１）の端部にロー溶着（Ｗ）したニップル部材（１１）の使用により、該ニップル部材の先端側の接続端部附近に設けた切削加工による鋸歯状壁部（１１′）に耐圧ゴムホース（１２）を被着した状態をもって、その後端部をニップル部材（１１）に掛支せしめた外側に配設した筒状ソケット部材（１３）により接続端部付近の被着部分を周囲よりカシメ（１４）して接続構成していた。尚（１２′）は耐圧ゴムホース（１２）のなす外側での金属細線による編組したブレードである。
【０００３】
【発明が解決しようとする課題】
しかしながら、このような従来の技術においては、厚肉材の切削加工による別途ニップル部材（１１）の使用と、金属管（Ｐ１１）端部でのロー溶着（Ｗ）とにより、これら加工並びに作業上の煩わしさを招いて著しく生産性の低下を余儀なくされ、またロー溶着部にあってその不確実によりしばしば洩れを生ぜしめ、同時に不慣れな作業に伴う過熱による機械的性質の劣化に起因して、加振下の配設状態とも相俟って金属管（Ｐ１１）側のロー溶着部付近に亀裂、破損を招くなどの問題を有するものであった。
【０００４】
本発明は従来技術の有する前記問題に鑑みてなされたものであり、金属管側での連結部を極めて簡易に形成し、ニップル部材およびそのロー溶着作業を不要となして生産性を向上せしめ、また転造又はプレス加工による櫛歯面の成形に関連した加工硬化によって連結部での剛性を高めることにより、該連結部を比較的薄肉構造をもって十分に対処して接続構造部全体を軽量となすことのできる薄肉細径金属管と耐圧ゴムホースとの接続構造およびその接続方法を提供することを目的とするものである。
【０００５】
【課題を解決するための手段】
上記目的を達成するため、本発明の第１の実施態様は、短寸状の内管を嵌合状または圧嵌状に挿着して二重壁となした金属管の接続端部附近を、該二重壁における少なくとも金属管に複数の環状の櫛歯面を設けて連結部となし、該連結部に耐圧ゴムホースを被着した状態をもって、底壁部を前記金属管側に掛支した有底筒状のソケット部材により相互の連接部分をカシメ固定して構成した薄肉細径金属管と耐圧ゴムホースとの接続構造において、前記内管挿着後の櫛歯面の成形前に予め金属管と内管の端面部の少なくとも一方を相互に固定して構成したものである。
【０００６】
また、本発明の第２の実施態様は、短寸状の内管を金属管の接続端部付近の内部に嵌合状または圧嵌状に挿着せしめて二重壁となし、かつ該二重壁に亘って接続端部付近を、外方から径方向の内方に向かって塑性加工を施して少なくとも金属管側に複数の環状の櫛歯面を形成せしめて連結部となし、しかる後に該連結部に耐圧ゴムホースを被着、連接した状態をもって組込んだ有底筒状のソケット部材によりその底壁部を前記櫛歯面の後方部位に掛支せしめ、次いで相互のなす連接部分をカシメ固定してなる薄肉細径金属管と耐圧ゴムホースとの接続方法を要旨とし、また予め少なくとも外周面に間隔を保持して環状の凹壁加工を施した短寸状の内管を金属管の接続端部付近の内部に嵌合状または圧嵌状に挿着せしめて二重壁となし、かつ該二重壁に亘って相互の重合面の少なくとも先端部を固定せしめて、接続端部付近を、外方から径方向の内方に向かって塑性加工を施して金属管および内管にまでおよぶ前記凹壁部に位置してなる間隔を保持した複数の環状の櫛歯面を形成せしめて連結部となし、しかる後に該連結部に耐圧ゴムホースを被着、連接した状態をもって組込んだ有底筒状のソケット部材によりその底壁部を前記櫛歯面の後方部位に掛支せしめ、次いで相互のなす連接部分をカシメ固定してなる薄肉細径金属管と耐圧ゴムホースとの接続方法を要旨とし、さらに前記複数の環状の櫛歯面は、外方からのロールによる転造加工あるいは押し型によるプレス加工により形成されたものである。
【０００７】
本発明では、以上のように構成されているため、前記連結部での二重壁および該二重壁部における少なくとも金属管の複数の環状の櫛歯面により金属管側あるいは短寸の内管にまでおよぶ該連結部を転造又はプレス加工などの塑性加工によって簡易に形成することができ、これら加工上の煩わしさをなくして著しく生産性を向上することができ、同時に前記加工による櫛歯面の成形に関連した加工硬化によって連結部での剛性を高めて該連結部を比較的薄肉構造をもって十分に対処して接続構造部全体を軽量となすことができることとなる。
【０００８】
【発明の実施の形態】
以下、本発明の実施例を図面に基づいて説明すれば、図１は本発明の薄肉細径金属管と耐圧ゴムホースとの接続構造の一実施例を示す拡大半截断面図、図２は同じく本発明の薄肉細径金属管と耐圧ゴムホースとの接続構造の他の実施例を示す図１相当図、図３は同じく本発明の薄肉細径金属管と耐圧ゴムホースとの接続構造の別の実施例を示す図１相当図 、図４は本発明の薄肉細径金属管と耐圧ゴムホースとの接続方法の一実施例を説明する図、図５は同じく他の実施例の接続方法を説明する図、図６は同じく別の実施例の接続方法を説明する図である。
【０００９】
図１〜図３に示す本発明の薄肉細径金属管と耐圧ゴムホースとの接続構造において、（１）は金属管（Ｐ）側の接続端部附近の連結部であり、短寸の内管（Ｐ′）を挿入もしくは圧入、焼嵌めあるいは冷嵌めなどにより、嵌合状または圧嵌状に挿着して二重壁（Ｐ″）となし、さらに図１〜図３に示すように該二重壁部における金属管（Ｐ）あるいは該金属管と短寸の内管（Ｐ′）にまでおよぶ連結部（１）を外方より径方向の内方に向かってロールによる転造加工もしくは押し型によるプレス加工などの塑性加工により複数の環状の櫛歯面（２）を形成してなるもので、これら櫛歯面（２）としては金属管（Ｐ）のみに間隔を保持した環状の凹凸壁や膨出壁を形成したり、あるいは金属管（Ｐ）と内管（Ｐ′）に間隔を保持した環状の膨出壁もしくは鋸歯壁などにより形成してもよい。なお、金属管（Ｐ）は連結部（１）の全長に亘り均肉であってもよいし、また櫛歯面（２）において切削加工、塑性加工、圧造加工または鍛造加工により減肉することもできる。
本発明は、前記内管（Ｐ′）挿着後の櫛歯面（２）の成形前に図１に示すように予め金属管（Ｐ）と内管（Ｐ′）の端面部の一方、あるいは図２に示すように内管（Ｐ′）の端面部の両方を相互に溶接などにより固定（６）したり、もしくは二重壁（Ｐ″）の重合面全体を図３に示すようにロー溶着などにより固定（６′）したりして金属管（Ｐ）と内管（Ｐ′）とが相互に位置ずれすることを防止したものである。なお、耐圧ゴムホースの挿入を容易にするため先端部をパンチにより先細りのテーパ状に成形することもできる。
【００１０】
そして前記連結部（１）に外側を金属細線によって編組されたブレード（７）を被覆した耐圧ゴムホース（Ｐ１）を挿入し、かかる状態をもって、底壁部（３′）を前記金属管（Ｐ）側の環溝（５）部に掛支した有底筒状のソケット部材（３）を円周方向の外方より径方向の内方に向かってカシメて相互の連接部分を固定（４）して接続構成するものである。
【００１１】
なお、金属管（Ｐ）と内管（Ｐ′）の材質は、一般的には共に鉄系金属であるが、適宜選択することができ、カシメ固定（４）に対する剛性を向上するためには、例えば金属管（Ｐ）を銅またはアルミウムのような軟質金属とし内管（Ｐ′）を鉄系金属とし、カシメ固定（４）の際に内管（Ｐ′）が変形して金属管（Ｐ）の損傷を防止するためには前記と反対に内管（Ｐ′）に銅またはアルミウムのような軟質金属を用い金属管（Ｐ）に鉄系金属を使用することもできる。同様に内管（Ｐ′）と金属管（Ｐ）の肉厚を目的に応じ異にすることもできる。
【００１２】
次に本発明による薄肉細径金属管と耐圧ゴムホースとの接続方法の一実施例を図４に基づいて説明する。
この実施例では、予め間隔をおいて環状の凹凸壁（２′）を形成した内管（Ｐ′）を金属管（Ｐ）の接続端部付近に嵌合状に挿着し（図４（ａ）参照）、次いで内管（Ｐ′）の環状の凹凸壁（２′）の凹壁部に対応する金属管（Ｐ）の外面位置にロール（８）を当接し（図４（ｂ）参照）、外方より径方向の内方に向かってロール（８）による転造加工で二重壁（Ｐ″）を重合して櫛歯面（２）を形成する（図４（ｃ）参照）。
【００１３】
次に上記接続方法の他の実施例を図５に基づいて説明する。
この実施例では、内管（Ｐ′）の外周面に切削加工などにより予め環状の凹溝（２ａ）を形成しておき、このような内管を金属管（Ｐ）の接続端部付近に嵌合状に挿着する（図５（ａ）参照）。次に内管（Ｐ′）の環状の凹溝（２ａ）に対応する金属管（Ｐ）の外面位置にロール（８）を当接し（図５（ｂ）参照）、ともに回転させながら外方より径方向の内方に向かってロール（８）による転造加工で二重壁（Ｐ″）を重合して櫛歯面（２）を形成する（図５（ｃ）参照）。
なお図４および図５の接続方法において、内管（Ｐ′）の材質や肉厚を金属管（Ｐ）より硬質とするか厚肉にすることにより該内管が芯金として働き前記金属管（Ｐ）の櫛歯面（２）の少なくとも一部を大きな曲率半径を持つことなく角張った凹部あるいは凸部または凹部と凸部の両者に形成でき、また有底筒状のソケット部材（３）の底壁部（３′）を掛支する環溝（５）も大きな曲率半径を持つことなく角張った凹部に形成することもできる。
【００１４】
さらに上記接続方法の別の実施例を図６に基づいて説明する。
この実施例では、内管（Ｐ′）の内周面に予め間隔をおいて環状の凹溝（２′ａ）を切削加工して残部に間隔をおいた環状の突出部（２ｂ）を形成し、このような内管を金属管（Ｐ）の接続端部付近に圧嵌状に挿着する（図６（ａ）参照）。次に内管（Ｐ′）の環状の突出部（２ｂ）に対応する金属管（Ｐ）の外面位置にロール（８）を当接し（図６（ｂ）参照）、ともに回転させながら外方より径方向の内方に向かってロール（８）を圧合することにより金属管（Ｐ）と内管（Ｐ′）からなる二重壁（Ｐ″）の肉厚部を塑性流動させて、櫛歯面（２）を形成する（図６（ｃ）参照）。この実施例では図１６（ｂ）における塑性流動の際に内管内部に芯金（９）を挿入しておくことが好ましい。
なおこれら図４〜図６の接続方法において用いられるロール（８）の外周面に微細な粗面を予め形成しておくことにより、金属管（Ｐ）の外周面に櫛歯面（２）を形成すると同時に耐圧ゴムホース（Ｐ１）の保持力を向上させる微細な粗面も形成することができる。
【００１５】
【発明の効果】
以上説明したように本発明による薄肉細径金属管と耐圧ゴムホースとの接続構造および接続方法は、前記連結部（１）のなす二重壁（Ｐ″）および該二重壁部における少なくとも金属管側に塑性加工により形成した櫛歯面（２）の構造により、連結部（１）を簡易に形成することができて、これら加工上の煩わしさをなくして著しく生産性を向上することができ、同時に該加工による櫛歯面（２）の成形に関連した加工硬化によって連結部（１）での剛性を高めることができ、従って該連結部を比較的薄肉構造をもって十分に対処することができて接続構造全体を軽量となすとともに、前記金属管（Ｐ）の櫛歯面（２）の全面または該櫛歯面の凹部のみもしくは凸部のみのような一部に、深さが約０．１ｍｍ以下の微細な粗面を形成すると耐圧ゴムホース（Ｐ１）の保持力が向上するためカシメ固定（４）と相俟って前記耐圧ゴムホースが抜けにくくなるなど、極めて有用な薄肉細径金属管と耐圧ゴムホースとの接続構造および接続方法である。
【図面の簡単な説明】
【図１】 本発明の薄肉細径金属管と耐圧ゴムホースとの接続構造の一実施例を示す拡大半截断面図である。
【図２】 同じく本発明の薄肉細径金属管と耐圧ゴムホースとの接続構造の他の実施例を示す図１相当図である。
【図３】 同じく本発明の薄肉細径金属管と耐圧ゴムホースとの接続構造の別の実施例を示す図１相当図である。
【図４】 本発明の薄肉細径金属管と耐圧ゴムホースとの接続方法の一実施例を説明する図で、（ａ）〜（ｃ）は接続工程を順次説明する図である。
【図５】 本発明の薄肉細径金属管と耐圧ゴムホースとの接続方法の他の実施例を説明する図で、（ａ）〜（ｃ）は接続工程を順次説明する図である。
【図６】 本発明の薄肉細径金属管と耐圧ゴムホースとの接続方法の別の実施例を説明する図で、（ａ）〜（ｃ）は接続工程を順次説明する図である。
【図７】 従来例を示す接続構造の一部切欠き断面図である。
【符号の説明】
１ 連結部
２ 櫛歯面
３ ソケット部材
３′ 底壁部
４ カシメ固定
５ 環溝
６ 固定
７ ブレード
Ｐ 金属管
Ｐ１ 耐圧ゴムホース
Ｐ′ 内管
Ｐ″ 二重壁[0001]
BACKGROUND OF THE INVENTION
In general, the present invention is a braided metal pipe having a relatively thin wall diameter of about 20 m / m or less, which is provided as a supply path for oil supply or air supply to automobiles or various machines and devices, and a metal thin wire on the outside. The present invention relates to a connection structure with a pressure-resistant rubber hose and a connection method thereof.
[0002]
[Prior art]
Conventionally, as a connecting structure of this kind and a connecting method thereof, as shown in FIG. 7 , generally, the tip of the nipple member is used by using a nipple member (11) that is low-welded (W) to the end of the metal tube (P11). With the pressure-resistant rubber hose (12) attached to the saw-toothed wall (11 ') provided near the connection end on the side, the rear end is arranged outside the nipple member (11). The cylindrical socket member (13) provided is connected and configured by caulking (14) the attached portion near the connection end from the periphery. Incidentally, (12 ') is a braided blade made of fine metal wires outside the pressure rubber hose (12).
[0003]
[Problems to be solved by the invention]
However, in such a conventional technique, these processing and work are performed by using a separate nipple member (11) by cutting a thick material and by low welding (W) at the end of the metal pipe (P 11 ). Due to the inconvenience of the above, the productivity is inevitably lowered, and in the welded part, it often leaks due to its uncertainties. In combination with the state of arrangement under vibration, the metal pipe (P 11 ) side has problems such as cracks and breakage in the vicinity of the low weld area.
[0004]
The present invention has been made in view of the above-mentioned problems of the prior art, forming a connecting portion on the metal tube side very easily, eliminating the need for a nipple member and its low welding operation, and improving productivity, Also, by increasing the rigidity of the connecting part by work hardening related to the formation of the comb tooth surface by rolling or pressing, the connecting part can be sufficiently handled with a relatively thin structure to reduce the weight of the entire connecting structure part. An object of the present invention is to provide a connection structure between a thin-walled thin metal tube and a pressure-resistant rubber hose and a connection method thereof.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the first embodiment of the present invention has a structure in which a short inner pipe is inserted into a fitting shape or a press-fitting shape to make a double wall near the connection end of the metal tube. The double wall is provided with a plurality of annular comb surfaces on at least the metal tube to form a connecting portion, and a pressure resistant rubber hose is attached to the connecting portion, and the bottom wall portion is suspended on the metal tube side. In a connecting structure of a thin-walled thin metal tube and a pressure-resistant rubber hose formed by caulking and fixing the connecting portions with a bottomed cylindrical socket member, the metal tube is previously formed before the comb tooth surface is formed after the inner tube is inserted. And at least one of the end face portions of the inner pipe is fixed to each other .
[0006]
Further, the second embodiment of the present invention is a double wall formed by inserting a short inner tube into the vicinity of the connection end portion of the metal tube in a fitting or press-fitting manner. The connection end near the heavy wall is subjected to plastic working from the outside toward the inside in the radial direction to form a plurality of annular comb surfaces on at least the metal tube side to form a connecting portion, and thereafter A pressure-resistant rubber hose is attached to the connecting portion, and the bottom wall portion is supported on the rear portion of the comb-tooth surface by a bottomed cylindrical socket member assembled in a connected state, and then the connecting portion formed between each other is caulked. The gist is the connection method between a thin thin metal tube and a pressure-resistant rubber hose that are fixed, and a short inner tube that has been processed with an annular concave wall at least at the outer peripheral surface in advance is connected to the metal tube. Inserted into the inside of the vicinity of the end in a fitting or press-fitting form to form a double wall, and And allowed to fix at least the distal end portion of the mutual polymerization surface across the heavy wall, near the connecting end portion extends to the metal tube is subjected to plastic working toward the outside radially inward and the inner tube wherein the concave Formed as a connecting part by forming a plurality of annular comb-tooth surfaces that are located on the wall and maintaining the interval, and then a pressure-resistant rubber hose is attached to the connecting part and assembled in a connected state. A gist of the method of connecting the pressure-resistant rubber hose with the thin-walled thin metal tube, in which the bottom wall portion is supported by the rear portion of the comb tooth surface by the socket member, and then the connecting portion formed by mutual crimping is fixed. The plurality of annular comb teeth surfaces are formed by rolling with a roll from the outside or pressing with a pressing die.
[0007]
In the present invention, since it is configured as described above, the metal tube side or the short inner tube is formed by the double wall at the connecting portion and at least a plurality of annular comb teeth surfaces of the metal tube at the double wall portion. The connecting portion extending up to 5 mm can be easily formed by plastic working such as rolling or pressing, and productivity can be remarkably improved by eliminating the troublesomeness of the processing. Work hardening related to surface molding increases the rigidity of the connecting portion, and the connecting portion can be sufficiently handled with a relatively thin structure to make the entire connecting structure light.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, will be described based on an embodiment of the present invention with reference to the drawings, FIG. 1 is an enlarged half-cut sectional view showing an embodiment of a connection structure between the thin small diameter metal tube and the breakdown voltage rubber hose of the present invention, FIG 2 is also present FIG. 1 is a view corresponding to FIG. 1 showing another embodiment of the connection structure between the thin-walled thin metal tube and the pressure-resistant rubber hose of the invention, and FIG. 3 is another embodiment of the connection structure between the thin-walled thin metal tube and the pressure-resistant rubber hose of the present invention. FIG . 4 is a diagram for explaining one embodiment of a method for connecting a thin-walled thin metal tube and a pressure-resistant rubber hose of the present invention, FIG. 5 is a diagram for explaining a connection method of another embodiment, 6 Ru FIG der to also how to connect to another embodiment.
[0009]
In the connection structure of the thin-walled thin metal tube and the pressure-resistant rubber hose of the present invention shown in FIGS. 1 to 3, (1) is a connecting portion near the connection end on the metal tube (P) side, and a short inner tube (P ′) is inserted or fitted, press-fitted, shrink-fitted, or cold-fitted into a fitting or press-fitting shape to form a double wall (P ″). Further, as shown in FIGS. Rolling process of the metal pipe (P) in the double wall part or the connecting part (1) extending from the metal pipe to the short inner pipe (P ′) by a roll from the outside toward the inside in the radial direction or those obtained by forming a comb tooth surfaces of a plurality of annular (2) by plastic working such as press working by the press mold, as these comb tooth surface (2) and held apart only metallic pipe (P) cyclic bulging or form irregularities wall or bulging walls, there have the annular holding apart inner tube metallic pipe (P) (P ') It may be formed by a wall or a sawtooth wall, etc. The metal pipe (P) may be uniform over the entire length of the connecting portion (1), or may be cut and plasticized on the comb-tooth surface (2). The thickness can also be reduced by processing, forging or forging.
In the present invention, one of the end faces of the metal pipe (P) and the inner pipe (P ′) is preliminarily formed as shown in FIG. 1 before forming the comb tooth surface (2) after the inner pipe (P ′) is inserted. Alternatively, as shown in FIG. 2, both end faces of the inner pipe (P ′) are fixed to each other by welding or the like (6), or the entire overlapping surface of the double wall (P ″) is shown in FIG. The metal pipe (P) and the inner pipe (P ') are prevented from being displaced from each other by being fixed (6') by low welding, etc. Note that the pressure rubber hose can be easily inserted. Therefore, the tip can be formed into a tapered shape with a punch.
[0010]
Then, a pressure-resistant rubber hose (P 1 ) covered with a braid (7) braided on the outside with a fine metal wire is inserted into the connecting part (1), and in this state, the bottom wall part (3 ′) is connected to the metal pipe (P ) The bottomed cylindrical socket member (3) suspended in the ring groove (5) on the side is caulked from the outer side in the circumferential direction to the inner side in the radial direction to fix the connecting parts (4) To connect and configure.
[0011]
The material of the metal pipe (P) and the inner pipe (P ′) is generally an iron-based metal, but can be selected as appropriate. In order to improve the rigidity against the caulking (4) For example, the metal pipe (P) is a soft metal such as copper or aluminum and the inner pipe (P ') is an iron-based metal. When the caulking is fixed (4), the inner pipe (P') is deformed and the metal pipe ( In order to prevent damage to P), a soft metal such as copper or aluminum can be used for the inner pipe (P ′) and an iron-based metal can be used for the metal pipe (P). Similarly, the thickness of the inner pipe (P ′) and the metal pipe (P) can be made different according to the purpose.
[0012]
Next, an embodiment of a method for connecting a thin thin metal tube and a pressure resistant rubber hose according to the present invention will be described with reference to FIG .
In this embodiment, inserted 'inner tube forming the (P annular uneven wall (2)' at a pre-intervals) in a fitting shape near the connection end of the metal pipe (P) (Fig. 4 ( a)), then the inner tube (P metal tube which corresponds to the concave wall part of the ') of the annular concavo-convex wall (2') of the roll (8) on the outer surface position of (P) in contact (see FIG. 4 (b) (See FIG. 4 (c)), the double wall (P ″) is polymerized by rolling with a roll (8) from the outside toward the inside in the radial direction to form a comb tooth surface (2). ).
[0013]
Next, another embodiment of the above connection method will be described with reference to FIG.
In this embodiment, an annular concave groove (2a) is formed in advance on the outer peripheral surface of the inner pipe (P ′) by cutting or the like, and such an inner pipe is placed near the connection end of the metal pipe (P). inserting and attaching the fitting shape (see Figure 5 (a)). Next, the roll (8) is brought into contact with the outer surface position of the metal pipe (P) corresponding to the annular groove (2a) of the inner pipe (P ') (see FIG. 5 (b)), and is rotated outward while rotating together. The double wall (P ″) is polymerized by rolling with a roll (8) inward in the radial direction to form a comb tooth surface (2) (see FIG. 5 (c)).
4 and 5, the inner tube serves as a metal core by making the material and thickness of the inner tube (P ') harder or thicker than the metal tube (P). At least a part of the comb tooth surface (2) of (P) can be formed in an angular recess or protrusion or both recess and protrusion without having a large radius of curvature, and a bottomed cylindrical socket member (3) The annular groove (5) for supporting the bottom wall portion (3 ') of the steel plate can also be formed in an angular recess without having a large radius of curvature.
[0014]
Further, another embodiment of the connection method will be described with reference to FIG.
In this embodiment, an annular groove (2'a) is cut in advance on the inner peripheral surface of the inner pipe (P ') to form an annular protrusion (2b) spaced at the remaining portion. and, for inserting such inner tube press fit shape in the vicinity of the connection end of the metal pipe (P) (see FIG. 6 (a)). Next, the roll (8) is brought into contact with the outer surface position of the metal pipe (P) corresponding to the annular protrusion (2b) of the inner pipe (P ') (see FIG. 6 (b)), and is rotated outward while rotating together. By compressing the roll (8) inward in the radial direction, the thick wall portion of the double wall (P ″) composed of the metal tube (P) and the inner tube (P ′) is plastically flowed, A comb-tooth surface (2) is formed (see FIG. 6 (c)) In this embodiment, it is preferable to insert a metal core (9) into the inner tube during plastic flow in FIG. .
In addition, by forming a fine rough surface in advance on the outer peripheral surface of the roll (8) used in the connection method of FIGS. 4 to 6 , the comb tooth surface (2) is formed on the outer peripheral surface of the metal tube (P). At the same time as forming, a fine rough surface that improves the holding power of the pressure-resistant rubber hose (P 1 ) can also be formed.
[0015]
【The invention's effect】
As described above, the connection structure and connection method between a thin-walled thin metal tube and a pressure-resistant rubber hose according to the present invention include the double wall (P ″) formed by the connecting portion (1) and at least the metal tube in the double wall portion. Due to the structure of the comb tooth surface (2) formed on the side by the plastic working, the connecting portion (1) can be easily formed, and the productivity can be remarkably improved without the troublesomeness of the working. At the same time, the rigidity at the connecting portion (1) can be increased by work hardening related to the formation of the comb tooth surface (2) by the processing, and therefore the connecting portion can be sufficiently dealt with with a relatively thin-walled structure. As a result, the entire connection structure becomes light, and the depth of the metal tube (P) is about 0. 0 on the entire comb tooth surface (2 ) or on a part of the comb tooth surface such as only the concave portion or only the convex portion. When a fine rough surface of 1 mm or less is formed, Due to the improved holding power of the pressure rubber hose (P1), it is difficult to remove the pressure rubber hose in combination with the caulking fixing (4). is there.
[Brief description of the drawings]
FIG. 1 is an enlarged half-sectional view showing an embodiment of a connection structure between a thin thin metal tube and a pressure-resistant rubber hose according to the present invention.
[Figure 2] Similarly a 1 equivalent view showing another embodiment of a connection structure between the thin small diameter metal tube and the breakdown voltage rubber hose of the present invention.
FIG. 3 is a view corresponding to FIG. 1 showing another embodiment of the connection structure between the thin and thin metal tube and the pressure-resistant rubber hose of the present invention .
In view for explaining an embodiment of a method of connecting the thin small diameter metal tube and the breakdown voltage rubber hose of the present invention; FIG, (a) ~ (c) are views sequentially illustrating the connection process.
FIG. 5 is a diagram for explaining another embodiment of the method for connecting the thin-walled thin metal tube and the pressure-resistant rubber hose of the present invention, and (a) to (c) are diagrams for sequentially explaining the connection steps.
[6] a view for explaining another embodiment of a method of connecting the thin small diameter metal tube and the breakdown voltage rubber hose of the present invention, (a) ~ (c) are views sequentially illustrating the connection process.
FIG. 7 is a partially cutaway sectional view of a connection structure showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30402496A JP3798086B2 (en) | 1995-11-16 | 1996-10-30 | Connection structure between thin-walled thin metal tube and pressure-resistant rubber hose and connection method thereof |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32224095 | 1995-11-16 | ||
| JP7-322240 | 1995-11-16 | ||
| JP30402496A JP3798086B2 (en) | 1995-11-16 | 1996-10-30 | Connection structure between thin-walled thin metal tube and pressure-resistant rubber hose and connection method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09196267A JPH09196267A (en) | 1997-07-29 |
| JP3798086B2 true JP3798086B2 (en) | 2006-07-19 |
Family
ID=26563750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30402496A Expired - Fee Related JP3798086B2 (en) | 1995-11-16 | 1996-10-30 | Connection structure between thin-walled thin metal tube and pressure-resistant rubber hose and connection method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3798086B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3561834B2 (en) * | 1999-04-02 | 2004-09-02 | エーティー技研株式会社 | Thermal cover |
| KR100387725B1 (en) * | 2000-09-20 | 2003-06-19 | 주식회사 혜인교역 | Metal hose for a shower device |
| JP4827153B2 (en) * | 2000-12-28 | 2011-11-30 | 臼井国際産業株式会社 | Reinforcement structure for connecting end of thin-walled thin metal pipe |
| JP2014181733A (en) * | 2013-03-18 | 2014-09-29 | Nisshin Steel Co Ltd | Joint structure and joint method for metallic pipe |
| PT3015751T (en) * | 2014-10-31 | 2018-01-09 | Apex Gold International Ltd | Fitting for connecting to a tubular element, tubing connection and a method for connecting a fitting to a tubular element |
-
1996
- 1996-10-30 JP JP30402496A patent/JP3798086B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09196267A (en) | 1997-07-29 |
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