JPWO2002037613A1 - Insulation cover coated compression sleeve - Google Patents

Insulation cover coated compression sleeve Download PDF

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JPWO2002037613A1
JPWO2002037613A1 JP2002540254A JP2002540254A JPWO2002037613A1 JP WO2002037613 A1 JPWO2002037613 A1 JP WO2002037613A1 JP 2002540254 A JP2002540254 A JP 2002540254A JP 2002540254 A JP2002540254 A JP 2002540254A JP WO2002037613 A1 JPWO2002037613 A1 JP WO2002037613A1
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insulating cover
sleeve
compression
cover
compression sleeve
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石山　文昭
清原　智之
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旭テック株式会社
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
    • H01R4/18—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping
    • H01R4/20—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping using a crimping sleeve

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Abstract

金属製スリーブ本体と、その金属製スリーブ本体の外周を覆うように設けられた電気絶縁材料からなる被覆部及びその被覆部から一体的に延長して設けられた突出部からなる絶縁カバーとにより構成される絶縁カバー被覆型圧縮スリーブである。絶縁カバーの引張伸び率やロックウェル硬さ、アイゾッド衝撃強さなどを適切な値に設定したことにより、スリーブ本体を圧縮して電線を接続する際に、絶縁カバーに割れ等の欠陥が生じにくく、良好な接続状態が得られる。A metal sleeve body, and an insulating cover composed of a covering portion made of an electrically insulating material provided so as to cover the outer periphery of the metal sleeve body and a projecting portion integrally extended from the covering portion. Is a compression sleeve covered with an insulating cover. By setting the tensile elongation, Rockwell hardness, Izod impact strength, etc. of the insulation cover to appropriate values, when the sleeve body is compressed and the electric wires are connected, defects such as cracks are unlikely to occur in the insulation cover. And a good connection state can be obtained.

Description

技術分野
本発明は、被覆電線の接続に用いられる絶縁カバー被覆型圧縮スリーブに関する。
背景技術
従来、この種の絶縁カバー被覆型圧縮スリーブ（以下、「圧縮スリーブ」という。）は、接続する被覆電線（以下、「電線」という。）の芯線の材質と同種の銅製やアルミニウム製等の電気導体からなる金属製スリーブ本体（以下、「スリーブ本体」という。）と、そのスリーブ本体の外周を覆うとともに、そのスリーブ本体から外方へ少し突出した電気絶縁材料からなる絶縁カバーとにより構成されている（例えば、特開平１０−１２２９０号公報参照）。
このスリーブ本体は、両端側に電線の絶縁性の被覆を除去して現れた芯線を挿入できる開口部をそれぞれ有するチューブ状を呈し、それら開口部に電線の芯線を挿入した後、スリーブ本体の外周を絶縁カバーの上から油圧シリンダーで駆動されるダイスを用いて圧縮すると、スリーブ本体の両側の電線の芯線は、スリーブ本体を介して物理的にも電気的にも接続される。
上述のように、従来の圧縮スリーブは、スリーブ本体を圧縮することにより、容易に電線を接続できるという特徴を有しているが、絶縁カバーを構成する電気絶縁材料の物理的特性、具体的には、引張伸び率や硬度、衝撃強度などが適切な範囲にないと、圧縮の際に絶縁カバーに割れが生じたり、圧縮が不完全となって所定の電気抵抗や引張荷重を満たすことができなくなり、良好な接続状態が得られないという問題があった。
本発明は、このような従来の事情に鑑みてなされたものであり、その目的とするところは、スリーブ本体を圧縮して電線を接続する際に、絶縁カバーに割れ等の欠陥が生じることなく、良好な接続状態が得られるような圧縮スリーブを提供することにある。
発明の開示
すなわち、本発明によれば、金属製スリーブ本体と、その金属製スリーブ本体の外周を覆うように設けられた電気絶縁材料からなる被覆部及びその被覆部から一体的に延長して設けられた突出部からなる絶縁カバーとにより構成される絶縁カバー被覆型圧縮スリーブであって、前記絶縁カバーの引張伸び率が６５〜２００％であることを特徴とする絶縁カバー被覆型圧縮スリーブ、が提供される。
発明を実施するための最良の形態
以下、本発明の実施の形態を図面に基づいて説明する。図１は本発明の一実施形態に係る圧縮スリーブ１を長手方向の上半分を断面として示し、かつ、左側の端部を省略した正面図である。
スリーブ本体２は、従来のスリーブ本体と同様に、銅製あるいはアルミニウム製等の電気導体の金属製からなる所定の長さを有するパイプから構成されている。そして、このスリーブ本体２の両端側には、電線Ｌの電気絶縁性の被覆Ｌ′を除去して現れた芯線Ｌ″が挿入される開口部２ａ、２ｂ（左側の開口部２ｂは、図１で省略されている。なお、開口部２ｂ側は、開口部２ａ側と同一構成なので、以下、開口部２ａ側のみで説明する。）がそれぞれ設けられているとともに、スリーブ本体２のほぼ中央部には、挿入された芯線Ｌ″の位置決め用の突起２ｃが設けられている。なお、図１では、スリーブ本体２の左側から挿入される電線Ｌは省略されている。
絶縁カバー３は、スリーブ本体２の長手方向の外周全面を覆う被覆部３ａと、スリーブ本体２の開口部２ａ側からスリーブ本体２の長手方向の外側へ所定長さ延長して設けられている筒状の突出部３ｂとから構成されている。
絶縁カバー３の被覆部３ａの外側に設けられている突出部３ｂは、被覆部３ａと一体的に構成されている。そして、この突出部３ｂの外径は、被覆部３ａと等しく、その突出部３ｂの内壁３ｂ′は、電線被覆の外径よりも少し大きく形成されている。したがって、スリーブ本体２に電線Ｌを挿入する場合には、スリーブ本体２内の空気がスムーズに抜けて、電線Ｌの挿入が容易になる。
前記突出部３ｂの内周３ｂ′の内径は、ストレートでもよいが、電線Ｌの芯線Ｌ″の挿入を容易にするために、スリーブ本体２側よりも外側の方が内径が大きく、つまりラッパ状に形成されていることが好ましい。このように、ラッパ状に形成した場合には、芯線Ｌ″が図１の二点鎖線の矢印方向からスリーブ２本体に挿入されるときの案内の役目を果たすことができ、このため、スリーブ本体２の開口部２ａへ芯線Ｌ″を挿入する作業を活線工具やロボットのマニピュレータで行うときに特に有効となる。
図１中、点で示されるＳは、圧縮スリーブ１を用いて電線Ｌを挿入する際に塗布されるシリコングリースである。このシリコングリースＳは、スリーブ本体２内への芯線Ｌ″の挿入を容易にするとともに、後述の図２に示されるように、圧縮されたのちの水密状態を良好に保つことが可能となり、スリーブ本体２内への雨水の侵入を効果的に防止するとともに、端部の電気絶縁性の確保が可能となる。
上記構成の圧縮スリーブ１で電線Ｌを接続するには、まず、電線Ｌの芯線Ｌ″が突出部３ｂを介してスリーブ本体２内に挿入される。そして、芯線Ｌ″がスリーブ本体２に挿入された後、図示しない油圧シリンダで駆動されるダイスを用いて圧縮される。この圧縮は、絶縁カバー３の被覆部３ａ及び突出部３ｂの外側から行われる。したがって、被覆部３ａとスリーブ本体２、スリーブ本体２と芯線Ｌ″、及び、突出部３ｂと被覆Ｌ′は、図２に示されるように、ダイスの当接部分がそれぞれ屈曲した状態となって、スリーブ本体２と芯線Ｌ″、及び、突出部３ｂと被覆Ｌ′の固着がそれぞれ図られる。
本発明において、絶縁カバー３は、電気絶縁性を有するとともに、その引張伸び率が６５〜２００％の範囲に限定される。本発明者らが鋭意検討した結果、引張伸び率がこのような範囲にある材料で絶縁カバー３を構成すると、スリーブ本体２を圧縮する際に、絶縁カバー３に割れが発生しにくいことが分かった。
また、本発明においては、絶縁カバー３のロックウェル硬さが１００〜１２０であることが好ましい。絶縁カバー３のロックウェル硬さが１００未満だと、絶縁カバー３の外側からスリーブ本体２を十分に圧縮することが難しく、圧縮が不完全になりやすい。一方、絶縁カバー３のロックウェル硬さが１２０を超えると、引張伸び率が前記適切な範囲にあっても、圧縮時に割れが生じることがある。
更に、本発明においては、絶縁カバー３のアイゾッド衝撃強さ（反ノッチ側）が８００Ｊ／ｍ以上であることが好ましい。絶縁カバー３のアイゾッド衝撃強さ（反ノッチ側）が８００Ｊ／ｍ未満では、引張伸び率及びロックウェル硬さが適切な範囲にあっても、圧縮時に割れが生じることがある。
なお、引張伸び率についてはＡＳＴＭ　Ｄ−６３８に、ロックウェル硬さについてはＡＳＴＭ　Ｄ−７８５に、アイゾッド衝撃強さについてはＡＳＴＭ　Ｄ−２５６に、それぞれ試験法が規定されている。
絶縁カバー３の具体的な材料としては、例えばポリアセタール系樹脂が好ましく使用できる。
また、本発明のスリーブは、電線を接続する際に、スリーブ本体２の外周を絶縁カバー３の外側から六角ダイスを用いて圧縮することが好ましい。図４に示すように、丸型ダイス６を用いてスリーブ本体２の断面が円形から口唇形状になるように圧縮すると、ダイス６が絶縁カバー３に広い範囲で直接接触したまま圧縮がなされるため、絶縁カバー３の一部が上下のダイス間に逃げ、最後にダイスの縁に挿まれて、破れたり、穴があくことがある。
これに対し、図３に示すように、六角ダイス５を用いて圧縮を行うと、絶縁カバー３とダイス５との間に隙間７ができ、圧縮された絶縁カバー３の一部は、この隙間７に逃げるため、前記のように絶縁カバー３が破れたり、穴があくことがない。
また、この圧縮は圧縮率１５〜２０％の範囲でなされることが好ましい。圧縮率が１５％未満だと圧縮が不完全になりやすく、２０％を超えると絶縁カバー３に割れが発生しやすくなる。なお、圧縮率は、下式により求めることができる。
圧縮率（％）＝（Ａ１−Ａ２）／Ａ１×１００
Ａ１：圧縮前のスリーブ本体と絶縁カバーと電線（芯線）の断面積の和
Ａ２：圧縮後のスリーブ本体と絶縁カバーと電線（芯線）の断面積の和
産業上の利用可能性
以上説明したように、本発明の圧縮スリーブは、絶縁カバーの引張伸び率やロックウェル硬さ、アイゾッド衝撃強さなどを適切な値に設定したことにより、スリーブ本体を圧縮して電線を接続する際に、絶縁カバーに割れ等の欠陥が生じにくく、良好な接続状態が得られる。
【図面の簡単な説明】
図１は、本発明の一実施形態に係る圧縮スリーブの長手方向の半分を断面で示し、かつ、左側を省略した正面図である。
図２は、圧縮後の状態を示す参考図である。
図３は、六角ダイスを用いたスリーブの圧縮を示す説明図である。
図４は、丸型ダイスを用いたスリーブの圧縮を示す説明図である。TECHNICAL FIELD The present invention relates to an insulating cover-coated compression sleeve used for connecting a coated electric wire.
2. Description of the Related Art Conventionally, this type of insulating cover-coated compression sleeve (hereinafter, referred to as "compression sleeve") is made of copper, aluminum, or the like, which is the same as the material of the core wire of a coated electric wire to be connected (hereinafter, referred to as "electric wire"). (Hereinafter referred to as "sleeve body"), and an insulating cover made of an electrically insulating material that covers the outer periphery of the sleeve body and slightly protrudes outward from the sleeve body. (See, for example, Japanese Patent Application Laid-Open No. 10-12290).
The sleeve body has a tubular shape having openings at both ends, into which the cores appearing after removing the insulating coating of the wires can be inserted, and after inserting the cores of the wires into the openings, the outer periphery of the sleeve body is removed. Is compressed from above the insulating cover using a die driven by a hydraulic cylinder, the core wires of the electric wires on both sides of the sleeve body are physically and electrically connected via the sleeve body.
As described above, the conventional compression sleeve has a feature that the electric wire can be easily connected by compressing the sleeve body, but the physical characteristics of the electric insulating material forming the insulating cover, specifically, If the tensile elongation, hardness, impact strength, etc. are not in the appropriate ranges, the insulation cover will crack during compression or the compression will be incomplete and the specified electrical resistance and tensile load can be satisfied. There is a problem that a good connection state cannot be obtained.
The present invention has been made in view of such a conventional situation, and an object of the present invention is to prevent a defect such as a crack from occurring in an insulating cover when compressing a sleeve body and connecting an electric wire. To provide a compression sleeve capable of obtaining a good connection state.
DISCLOSURE OF THE INVENTION That is, according to the present invention, a metal sleeve main body, a covering portion made of an electrically insulating material provided so as to cover the outer periphery of the metal sleeve main body, and integrally provided from the covering portion are provided. An insulating cover comprising an insulating cover having a protruding portion, wherein the insulating cover has a tensile elongation of 65 to 200%. Provided.
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a compression sleeve 1 according to an embodiment of the present invention, in which an upper half in a longitudinal direction is shown as a cross section and a left end is omitted.
The sleeve main body 2 is formed of a pipe having a predetermined length made of metal such as copper or aluminum as an electric conductor, similarly to the conventional sleeve main body. Openings 2a and 2b (left-side openings 2b are formed on both sides of the sleeve body 2) into which core wires L ″ appearing after removing the electrically insulating covering L ′ of the electric wires L are inserted. Note that the opening 2b side has the same configuration as the opening 2a side, so that only the opening 2a side will be described below.) Is provided with a projection 2c for positioning the inserted core wire L ″. In FIG. 1, the electric wire L inserted from the left side of the sleeve main body 2 is omitted.
The insulating cover 3 is provided with a covering portion 3a that covers the entire outer periphery in the longitudinal direction of the sleeve main body 2 and a tube that is provided to extend a predetermined length from the opening 2a side of the sleeve main body 2 to the outside in the longitudinal direction of the sleeve main body 2. And a protruding portion 3b.
The protruding portion 3b provided outside the covering portion 3a of the insulating cover 3 is formed integrally with the covering portion 3a. The outer diameter of the projection 3b is equal to that of the covering 3a, and the inner wall 3b 'of the projection 3b is formed to be slightly larger than the outer diameter of the electric wire coating. Therefore, when the electric wire L is inserted into the sleeve main body 2, the air in the sleeve main body 2 is smoothly released, and the insertion of the electric wire L becomes easy.
The inner diameter of the inner circumference 3b 'of the protruding portion 3b may be straight, but in order to facilitate insertion of the core wire L "of the electric wire L, the inner diameter is larger on the outer side than on the sleeve body 2 side. In this manner, when formed in a trumpet shape, the core wire L "serves as a guide when the core wire L" is inserted into the sleeve 2 main body from the direction of the two-dot chain line arrow in FIG. This is particularly effective when the operation of inserting the core wire L ″ into the opening 2a of the sleeve main body 2 is performed using a live tool or a manipulator of a robot.
In FIG. 1, S indicated by a dot is silicon grease applied when the electric wire L is inserted using the compression sleeve 1. The silicone grease S facilitates insertion of the core wire L ″ into the sleeve main body 2 and, as shown in FIG. 2 described later, makes it possible to maintain a watertight state after being compressed. It is possible to effectively prevent rainwater from entering the main body 2 and to secure electrical insulation at the ends.
In order to connect the electric wire L with the compression sleeve 1 having the above configuration, first, the core wire L ″ of the electric wire L is inserted into the sleeve main body 2 via the protruding portion 3b. Then, it is compressed using a die driven by a hydraulic cylinder (not shown). This compression is performed from outside the covering portion 3a and the protruding portion 3b of the insulating cover 3. Accordingly, as shown in FIG. 2, the covering portion 3a and the sleeve main body 2, the sleeve main body 2 and the core wire L ″, and the protruding portion 3b and the covering L ′ are in a state where the contact portions of the dies are bent. The sleeve body 2 is fixed to the core wire L ″, and the protrusion 3b is fixed to the cover L ′.
In the present invention, the insulating cover 3 has electrical insulation properties, and its tensile elongation is limited to a range of 65 to 200%. As a result of intensive studies by the present inventors, it has been found that when the insulating cover 3 is made of a material having a tensile elongation in such a range, the insulating cover 3 is less likely to crack when the sleeve body 2 is compressed. Was.
Further, in the present invention, the Rockwell hardness of the insulating cover 3 is preferably 100 to 120. If the Rockwell hardness of the insulating cover 3 is less than 100, it is difficult to sufficiently compress the sleeve body 2 from the outside of the insulating cover 3, and the compression tends to be incomplete. On the other hand, if the Rockwell hardness of the insulating cover 3 exceeds 120, cracks may occur during compression even if the tensile elongation is within the appropriate range.
Further, in the present invention, it is preferable that the Izod impact strength (the side opposite to the notch) of the insulating cover 3 is 800 J / m or more. When the Izod impact strength (anti-notch side) of the insulating cover 3 is less than 800 J / m, cracks may occur during compression even if the tensile elongation and the Rockwell hardness are within appropriate ranges.
The test methods are defined in ASTM D-638 for tensile elongation, in ASTM D-785 for Rockwell hardness, and in ASTM D-256 for Izod impact strength.
As a specific material of the insulating cover 3, for example, a polyacetal resin can be preferably used.
Further, in the sleeve of the present invention, when connecting the electric wires, it is preferable that the outer periphery of the sleeve main body 2 is compressed from the outside of the insulating cover 3 using a hexagonal die. As shown in FIG. 4, when the cross section of the sleeve body 2 is compressed from a circular shape to a lip shape using a round die 6, the compression is performed while the die 6 is in direct contact with the insulating cover 3 in a wide range. In some cases, a part of the insulating cover 3 escapes between the upper and lower dies, and is finally inserted into the edge of the dies, causing breakage or holes.
On the other hand, as shown in FIG. 3, when compression is performed using a hexagonal die 5, a gap 7 is formed between the insulating cover 3 and the die 5, and a part of the compressed insulating cover 3 7, the insulating cover 3 is not torn or punctured as described above.
This compression is preferably performed at a compression ratio of 15 to 20%. If the compression ratio is less than 15%, the compression tends to be incomplete, and if it exceeds 20%, the insulating cover 3 tends to crack. The compression ratio can be obtained by the following equation.
Compression rate (%) = (A 1 −A 2 ) / A 1 × 100
A 1 : Sum of cross-sectional area of sleeve body, insulating cover, and electric wire (core wire) before compression A 2 : Sum of cross-sectional area of sleeve body, insulating cover, and electric wire (core wire) after compression As described above, the compression sleeve of the present invention, when the tensile elongation and Rockwell hardness of the insulating cover, the Izod impact strength and the like are set to appropriate values, when compressing the sleeve body and connecting the electric wire In addition, defects such as cracks are unlikely to occur in the insulating cover, and a good connection state can be obtained.
[Brief description of the drawings]
FIG. 1 is a front view in which a longitudinal half of a compression sleeve according to an embodiment of the present invention is shown in cross section and the left side is omitted.
FIG. 2 is a reference diagram showing a state after compression.
FIG. 3 is an explanatory diagram showing compression of a sleeve using a hexagon die.
FIG. 4 is an explanatory diagram showing compression of a sleeve using a round die.

Claims (6)

金属製スリーブ本体と、その金属製スリーブ本体の外周を覆うように設けられた電気絶縁材料からなる被覆部及びその被覆部から一体的に延長して設けられた突出部からなる絶縁カバーとにより構成される絶縁カバー被覆型圧縮スリーブであって、
前記絶縁カバーの引張伸び率が６５〜２００％であることを特徴とする絶縁カバー被覆型圧縮スリーブ。Consisting of a metal sleeve main body, a covering portion made of an electrically insulating material provided so as to cover the outer periphery of the metal sleeve main body, and an insulating cover consisting of a projecting portion integrally extended from the covering portion. An insulating cover-coated compression sleeve,
The insulating cover-coated compression sleeve, wherein a tensile elongation of the insulating cover is 65 to 200%. 前記絶縁カバーのロックウェル硬さが１００〜１２０である請求の範囲第１項記載の絶縁カバー被覆型圧縮スリーブ。The insulating cover-coated compression sleeve according to claim 1, wherein the insulating cover has a Rockwell hardness of 100 to 120. 前記絶縁カバーのアイゾッド衝撃強さ（反ノッチ側）が８００Ｊ／ｍ以上である請求の範囲第１項又は第２項に記載の絶縁カバー被覆型圧縮スリーブ。The insulating cover-coated compression sleeve according to claim 1 or 2, wherein the Izod impact strength (anti-notch side) of the insulating cover is 800 J / m or more. 前記絶縁カバーがポリアセタール系樹脂からなる請求の範囲第１項ないし第３項のいずれか１項に記載の絶縁カバー被覆型圧縮スリーブ。The compression sleeve according to any one of claims 1 to 3, wherein the insulating cover is made of a polyacetal resin. 電線を接続する際に、前記金属製スリーブ本体の外周を前記絶縁カバーの外側から六角ダイスを用いて圧縮した請求の範囲第１項ないし第４項のいずれか１項に記載の絶縁カバー被覆型圧縮スリーブ。The insulation cover-coated mold according to any one of claims 1 to 4, wherein when connecting the electric wire, an outer periphery of the metal sleeve body is compressed from outside the insulation cover using a hexagonal die. Compression sleeve. 前記圧縮が圧縮率１５〜２０％でなされた請求の範囲第５項記載の絶縁カバー被覆型圧縮スリーブ。The compression sleeve according to claim 5, wherein the compression is performed at a compression ratio of 15 to 20%.
JP2002540254A 2000-10-31 2000-10-31 Insulation cover coated compression sleeve Pending JPWO2002037613A1 (en)

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JP2007250363A (en) * 2006-03-16 2007-09-27 Nishi Nippon Electric Wire & Cable Co Ltd Sleeve for electric wire with insulation coating
JP5181248B2 (en) * 2007-12-25 2013-04-10 国立大学法人 大分大学 Sleeve with insulation coating for electric wire

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JPS5619874A (en) * 1979-07-25 1981-02-24 Mitsubishi Electric Corp Method of connecting lead wires for semiconductor device
JPH05146045A (en) * 1991-11-21 1993-06-11 Toshin Denki Kk Electrical wire branch connection part
GB9414037D0 (en) * 1994-07-11 1994-08-31 Raychem Ltd Electrical interconnection
JPH1012290A (en) * 1996-06-18 1998-01-16 Kyushu Electric Power Co Inc Compressive sleeve

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