JP7426862B2 - Electric wire with terminal and its manufacturing method - Google Patents
Electric wire with terminal and its manufacturing method Download PDFInfo
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- JP7426862B2 JP7426862B2 JP2020046614A JP2020046614A JP7426862B2 JP 7426862 B2 JP7426862 B2 JP 7426862B2 JP 2020046614 A JP2020046614 A JP 2020046614A JP 2020046614 A JP2020046614 A JP 2020046614A JP 7426862 B2 JP7426862 B2 JP 7426862B2
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- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 238000002788 crimping Methods 0.000 claims description 246
- 239000004020 conductor Substances 0.000 claims description 49
- 238000000034 method Methods 0.000 claims description 18
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- 230000006835 compression Effects 0.000 description 7
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
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- 238000005452 bending Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
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- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
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- Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
Description
本発明は自動車等に用いられる端子付き電線及びその製造方法に関するものである。 TECHNICAL FIELD The present invention relates to an electric wire with a terminal used in automobiles and the like, and a method for manufacturing the same.
従来、自動車、ＯＡ機器、家電製品等の分野では、電力線や信号線として、電気導電性に優れた銅系材料からなる電線が使用されている。特に、自動車分野においては、車両の高性能化、高機能化が急速に進められており、車載される各種電気機器や制御機器が増加している。したがって、これに伴い、使用される端子付き電線も増加する傾向にある。 Conventionally, electric wires made of copper-based materials with excellent electrical conductivity have been used as power lines and signal lines in fields such as automobiles, OA equipment, and home appliances. In particular, in the automobile field, the performance and functionality of vehicles are rapidly increasing, and the number of various electrical devices and control devices mounted on vehicles is increasing. Therefore, along with this, there is a tendency for the number of electric wires with terminals to be used to increase.
一方、環境問題が注目される中、自動車の軽量化が要求されている。したがって、ワイヤハーネスの使用量増加に伴う重量増加が問題となる。このため、従来使用されている銅線に代えて、軽量なアルミニウム電線が注目されている。 On the other hand, with environmental issues attracting attention, there is a demand for lighter automobiles. Therefore, an increase in weight due to an increase in the amount of wire harness used becomes a problem. For this reason, lightweight aluminum electric wires are attracting attention in place of conventionally used copper wires.
ここで、このような電線同士を接続する際や機器類等の接続部においては、接続用端子が用いられる。しかし、アルミニウム電線を用いた端子付き電線であっても、接続部の信頼性等のため、端子部には、電気特性に優れる銅が使用される場合がある。このような場合には、アルミニウム電線と銅製の端子とが接合されて使用される。 Here, connection terminals are used when connecting such electric wires to each other or at connection parts of devices and the like. However, even in the case of an electric wire with a terminal using an aluminum electric wire, copper, which has excellent electrical properties, is sometimes used for the terminal part in order to ensure the reliability of the connection part. In such cases, aluminum wires and copper terminals are used together.
しかし、異種金属を接触させると、標準電極電位の違いから、いわゆる電食が発生する恐れがある。特に、アルミニウムと銅との標準電極電位差は大きいため、接触部への水の飛散や結露等の影響により、電気的に卑であるアルミニウム側の腐食が進行する。このため、接続部における電線と端子との接続状態が不安定となり、接触抵抗の増加や線径の減少による電気抵抗の増大、更には断線が生じて電装部品の誤動作、機能停止に至る恐れがある。 However, when dissimilar metals are brought into contact, so-called electrolytic corrosion may occur due to the difference in standard electrode potential. In particular, since the standard electrode potential difference between aluminum and copper is large, corrosion on the electrically base aluminum side progresses due to the influence of water splashing and dew condensation on the contact portion. As a result, the connection between the wire and the terminal at the connection point becomes unstable, increasing contact resistance, increasing electrical resistance due to a decrease in wire diameter, and even breaking the wire, which may lead to malfunction or stoppage of electrical components. be.
このような異種金属が接触するワイヤハーネスにおいて、例えば、一端閉塞型の筒状圧着部を有する端子を用い、この筒状圧着部内に電線の端部を挿入した後、該筒状圧着部をかしめ加工により圧着して、芯線端部を雨水や海水等の付着から保護する方法が提案されている（特許文献１）。 In such a wire harness where dissimilar metals come into contact, for example, a terminal having a cylindrical crimping part with one end closed is used, and after inserting the end of the electric wire into the cylindrical crimping part, the cylindrical crimping part is caulked. A method has been proposed in which the ends of the core wire are crimped by processing to protect them from adhesion of rainwater, seawater, etc. (Patent Document 1).
特許文献１のように、一端が封止された圧着部によって被覆導線を圧着し、圧着部と被覆導線の被覆部とを密着させることで水密性を確保することができる。このため、圧着部と被覆部との隙間から水が浸入し、内部で腐食が発生することを抑制することができる。 As in Patent Document 1, watertightness can be ensured by crimping the covered conducting wire with a crimping portion whose one end is sealed and bringing the crimping portion and the covering portion of the covered conducting wire into close contact. Therefore, it is possible to prevent water from entering through the gap between the crimping part and the covering part and causing corrosion inside.
一方、太径の被覆導線に端部に端子を圧着する場合には、圧着後の被覆圧着部の高さが問題となる場合がある。被覆圧着部の高さが高くなると、これを収容するキャビティへの挿入が困難となる。 On the other hand, when a terminal is crimped to the end of a large-diameter covered conductor, the height of the covered crimped portion after crimping may pose a problem. As the height of the covering crimp portion increases, it becomes difficult to insert it into the cavity that accommodates it.
これに対し、被覆圧着部を扁平形状にした圧着方法が提案されている（特許文献２）。このように、被覆圧着部を扁平化することで、特に太径の被覆導線と端子とを圧着する場合においても全体の高さを低くすることができる。 On the other hand, a crimping method has been proposed in which the covering crimping part is made flat (Patent Document 2). By flattening the covered crimping portion in this way, the overall height can be reduced, especially when crimping a large-diameter covered conductor and a terminal.
しかし、前述したように、一端封止型の端子においては、圧着部の内面と被覆部の外面との間で止水性を確保しているため、両者を確実に密着させることが重要である。特に、扁平圧着を行った場合には、圧着部が上面から大きく潰されるため、このような部位の被覆部に力がかかりすぎないように、注意が必要である。このため、特に太径の被覆導線を圧着する場合において問題となる、被覆部にかかる力を緩和することが可能な端子付き電線が望まれる。 However, as described above, in the one-end sealed terminal, water-tightness is ensured between the inner surface of the crimp part and the outer surface of the covering part, so it is important to ensure that the two are in close contact with each other. In particular, when flat crimping is performed, the crimping part is largely crushed from the top surface, so care must be taken not to apply too much force to the covering part in such areas. For this reason, an electric wire with a terminal is desired that can alleviate the force applied to the sheathing portion, which is a problem especially when crimping a large-diameter sheathed conductor wire.
本発明は、このような問題に鑑みてなされたもので、被覆圧着部において、被覆部へかかる力を緩和することが可能な端子付き電線及びその製造方法を提供することを目的とする。 The present invention has been made in view of such problems, and an object of the present invention is to provide an electric wire with a terminal that can reduce the force applied to the sheathing portion at the sheathing crimping portion, and a method for manufacturing the same.
前述した目的を達するために第１の発明は、被覆導線と端子とが接続された端子付き電線であって、前記端子は、前記被覆導線が圧着される圧着部と、端子本体とを有し、前記圧着部は、前記被覆導線の被覆部を圧着する被覆圧着部と、前記被覆導線の先端部において前記被覆部から露出する導線を圧着する導線圧着部とを有し、前記被覆導線が挿入される部位を除き、他の部位が封止されており、前記被覆圧着部の後端部において、平面視における幅方向の略中央の前記被覆圧着部の長さが短く、幅方向の両側方に向かうにつれて徐々に前記被覆圧着部の長さが長くなり、前記被覆圧着部の後端部において、幅方向の両端部の前記被覆圧着部の長さと幅方向の略中央の前記被覆圧着部の長さの差が、前記被覆部の厚さよりも大きいことを特徴とする端子付き電線である。 In order to achieve the above-mentioned object, a first invention provides an electric wire with a terminal in which a covered conductor wire and a terminal are connected, the terminal having a crimping part to which the covered conductor wire is crimped, and a terminal body. , the crimping part has a covering crimping part that crimps the covering part of the covered conducting wire, and a conducting wire crimping part that crimps the conducting wire exposed from the covering part at the tip of the covered conducting wire, and when the covered conducting wire is inserted, At the rear end of the covering crimping part, the length of the covering crimping part approximately at the center in the width direction in a plan view is short, and the length of the covering crimping part is short at the rear end of the covering crimping part, and The length of the covering crimping part gradually becomes longer as the covering crimping part gradually increases, and at the rear end of the covering crimping part, the length of the covering crimping part at both ends in the width direction and the covering crimping part approximately at the center in the width direction. The electric wire with a terminal is characterized in that the difference in length is greater than the thickness of the covering portion .
前記被覆導線の長手方向に垂直な前記被覆圧着部の断面形状が、高さよりも幅が広い扁平形状であってもよい。 The cross-sectional shape of the covered crimping portion perpendicular to the longitudinal direction of the covered conducting wire may be a flat shape with a width wider than a height.
前記被覆圧着部の後端部において、幅方向の両端部の前記被覆圧着部の長さと幅方向の略中央の前記被覆圧着部の長さの差が、前記被覆圧着部の肉厚よりも大きいことが望ましい。 At the rear end portion of the covering crimping portion, the difference between the length of the covering crimping portion at both ends in the width direction and the length of the covering crimping portion approximately at the center in the width direction is greater than the wall thickness of the covering crimping portion. This is desirable.
前記圧着部の上面には、長手方向に沿って接合部が形成され、前記被覆圧着部の後端部において、平面視における幅方向の略中央の前記被覆圧着部の長さが短い部位が、前記接合部の端部の位置と略一致してもよい。 A joint portion is formed along the longitudinal direction on the upper surface of the crimp portion, and at the rear end portion of the sheathing crimp portion, a portion where the length of the sheathing crimp portion is shorter is approximately at the center in the width direction in a plan view. The position may substantially coincide with the position of the end of the joint.
第１の発明によれば、被覆圧着部の後端部において、平面視における幅方向の略中央の被覆圧着部の長さを短くし、幅方向の両側方に向かうにつれて徐々に被覆圧着部の長さが長くなるようにすることで、被覆圧着部の後端部の形状の一部において、被覆導線の長手方向に対する傾斜部を形成することができる。すなわち、被覆圧着部の後端部の形状が、被覆導線の長手方向に垂直な方向に対して略直線状ではなく、屈曲又は湾曲した形状とすることができる。このため、被覆圧着部の後端部と被覆部との接触長が長くなり、せん断力や曲げ力等が加わった際に、被覆部へかかる力を緩和することができる。 According to the first invention, at the rear end portion of the covering crimping portion, the length of the covering crimping portion at approximately the center in the width direction in plan view is shortened, and the length of the covering crimping portion is gradually increased toward both sides in the width direction. By making the length longer, it is possible to form an inclined portion with respect to the longitudinal direction of the covered conductor wire in a part of the shape of the rear end portion of the covered crimping portion. That is, the shape of the rear end portion of the covering crimping portion may not be substantially straight in the direction perpendicular to the longitudinal direction of the covered conducting wire, but may be bent or curved. Therefore, the contact length between the rear end of the sheathing crimping part and the sheathing section becomes long, and when shearing force, bending force, etc. are applied, the force applied to the sheathing section can be alleviated.
特に、被覆圧着部の断面形状を扁平形状とした場合において、上記の効果をより効果的に得ることができる。 In particular, when the cross-sectional shape of the covering and crimping portion is made into a flat shape, the above-mentioned effects can be obtained more effectively.
また、被覆圧着部の後端部における長さの差が、被覆圧着部の肉厚よりも大きい場合や、被覆部の厚さよりも大きい場合に、上記の効果をより効果的に得ることができる。 Further, the above effect can be obtained more effectively when the difference in length at the rear end of the covering crimping part is larger than the wall thickness of the covering crimping part or when it is larger than the thickness of the covering part. .
また、平面視における幅方向の略中央において、圧着部の上面に長手方向に沿って溶接部が形成される場合に、上記の効果をより効果的に得ることができる。 Moreover, when a welded portion is formed along the longitudinal direction on the upper surface of the crimp portion at approximately the center in the width direction in plan view, the above effect can be obtained more effectively.
第２の発明は、被覆導線と端子とが接続された端子付き電線の製造方法であって、前記端子は、前記被覆導線が圧着される圧着部と、端子本体とを有し、前記圧着部は、前記被覆導線の被覆部を圧着する被覆圧着部と、前記被覆導線の先端部において前記被覆部から露出する導線を圧着する導線圧着部とを有し、前記被覆導線が挿入される部位を除き、他の部位が封止されており、前記圧着部の上面には、長手方向に沿って接合部が形成され、前記圧着部に前記被覆導線を挿入し、前記導線圧着部と前記導線を圧着するとともに、前記被覆圧着部と前記被覆部を仮圧着する第１圧着工程と、前記第１圧着工程の後、前記被覆圧着部と、前記被覆部を強圧着する第２圧着工程と、を具備し、前記第２圧着工程における金型の長さが、前記被覆圧着部よりも長く、前記被覆圧着部の後方に前記金型がはみ出した状態で前記第２圧着工程を行い、前記第２圧着工程において、前記接合部の前記被覆圧着部の後方への伸び量を、前記接合部以外の前記被覆圧着部の後方への伸び量より小さくすることを特徴とする端子付き電線の製造方法である。 A second invention is a method for manufacturing an electric wire with a terminal in which a covered conductive wire and a terminal are connected, wherein the terminal has a crimping part to which the covered conductor is crimped, and a terminal main body, and the terminal has a crimping part to which the covered conductor is crimped, and a terminal main body, has a covered crimping part for crimping the covering part of the covered conductor wire, and a conducting wire crimping part for crimping the conducting wire exposed from the covering part at the distal end of the covered conducting wire, and has a part into which the covered conducting wire is inserted. A joint is formed along the longitudinal direction on the upper surface of the crimping part, and the covered conductor is inserted into the crimping part, and the conductor crimping part and the conductor are connected. a first crimping step of crimping and temporarily crimping the covering crimping part and the covering part; and a second crimping process of strongly crimping the covering crimping part and the covering part after the first crimping process. The length of the mold in the second crimping process is longer than the covering crimping part, and the second crimping process is performed in a state where the mold protrudes behind the covering crimping part, A method for manufacturing an electric wire with a terminal, characterized in that in the crimping step, the amount of rearward expansion of the covered crimped portion of the joint portion is made smaller than the amount of backward expansion of the covered crimped portion other than the bonded portion. be.
第２の発明によれば、被覆圧着部を２回に分けて圧着し、被覆圧着部を強圧着する際に、被覆圧着部の後方に金型がはみ出すように配置することで、圧着の際に、被覆圧着部の後方への伸びを摩擦によって軽減することができる。この際、特に幅方向中央の上面に設けられた溶接部は、表面に微小な凹凸が形成されているため、金型との摩擦が大きく、この部位の後方への伸びを、他の部位と比較して抑制することができる。この結果、幅方向の略中央部における被覆圧着部の長さを短くすることができる。 According to the second invention, the covering crimping part is crimped in two steps, and when the covering crimping part is strongly crimped, the mold is arranged so as to protrude behind the covering crimping part, so that when crimping In addition, the rearward extension of the cover crimped portion can be reduced by friction. At this time, especially the welded part provided on the upper surface at the center in the width direction has minute irregularities formed on the surface, so there is large friction with the mold, and the rearward elongation of this part is less than that of other parts. can be compared and suppressed. As a result, it is possible to shorten the length of the covering crimping portion at the substantially central portion in the width direction.
本発明によれば、被覆圧着部において、被覆部へかかる力を緩和することが可能な端子付き電線及びその製造方法を提供することができる。 According to the present invention, it is possible to provide an electric wire with a terminal capable of relieving the force applied to the covering portion in the covering crimping portion, and a method for manufacturing the same.
図１は、本発明にかかる端子付き電線１０を示す斜視図であり、図２は、端子付き電線１０の平面図である。また、図３（ａ）は、図２のＸ－Ｘ線断面図であり、図３（ｂ）は、図２のＹ－Ｙ線断面図である。端子付き電線１０は、端子１と被覆導線２３とが圧着されて構成される。 FIG. 1 is a perspective view showing an electric wire 10 with a terminal according to the present invention, and FIG. 2 is a plan view of the electric wire 10 with a terminal. 3(a) is a sectional view taken along the line XX in FIG. 2, and FIG. 3(b) is a sectional view taken along the line YY in FIG. The electric wire 10 with a terminal is constructed by crimping the terminal 1 and the covered conductor 23.
被覆導線２３は、導線２５が絶縁性の被覆部２７によって被覆されて構成される。導線２５は、例えばアルミニウムまたはアルミニウム合金製である。被覆導線２３を端子１の圧着部５に挿入する際には、被覆導線２３の先端の一部の被覆部２７が剥離され、導線２５が露出される。なお、被覆部２７としては、ポリ塩化ビニル（ＰＶＣ）、ポリエチレン等、この技術の分野において通常用いられるものを選択することができる。 The covered conductive wire 23 is constructed by covering the conductive wire 25 with an insulating covering portion 27 . The conducting wire 25 is made of aluminum or aluminum alloy, for example. When inserting the covered conductive wire 23 into the crimp portion 5 of the terminal 1, a part of the covering portion 27 at the tip of the covered conductive wire 23 is peeled off, and the conductive wire 25 is exposed. Note that as the covering portion 27, materials commonly used in this technical field, such as polyvinyl chloride (PVC) and polyethylene, can be selected.
端子１は、例えば銅または銅合金製であり、端子本体３と、被覆導線２３が圧着される圧着部５とからなる。端子本体３は、所定の形状の板材を、断面が矩形の筒体に形成したものである。端子本体３は、前端部１７に、板材を矩形の筒体内に折り込んで形成される弾性接触片１５を有する。端子本体３は、前端部１７から雄型端子などが挿入されて接続される。 The terminal 1 is made of copper or a copper alloy, for example, and includes a terminal body 3 and a crimping part 5 to which a covered conductor 23 is crimped. The terminal main body 3 is a plate material having a predetermined shape formed into a cylindrical body having a rectangular cross section. The terminal main body 3 has an elastic contact piece 15 formed by folding a plate material into a rectangular cylinder at a front end portion 17. A male terminal or the like is inserted into the terminal body 3 from the front end 17 and connected thereto.
なお、以下の説明では、端子本体３が、雄型端子等の挿入タブ（図示省略）の挿入を許容する雌型端子である例を示すが、本発明において、この端子本体３の細部の形状は特に限定されない。例えば、雌型の端子本体３に代えて雄型端子の挿入タブを設けてもよいし、丸型端子のようなボルト締結部を設けても良い。 In the following description, an example will be shown in which the terminal main body 3 is a female terminal that allows insertion of an insertion tab (not shown) such as a male terminal, but in the present invention, the detailed shape of the terminal main body 3 is not particularly limited. For example, instead of the female terminal main body 3, an insertion tab for a male terminal may be provided, or a bolt fastening portion such as a round terminal may be provided.
圧着部５は、断面が円形の筒体となるように丸められ、側縁部同士を突き合わせて接合部２１で接合して一体化することにより形成される。また、圧着部５の前端側（端子本体３側）には封止部１１が設けられる。被覆導線２３は、筒状に形成された圧着部５の開口端部側から挿入される。すなわち、圧着部５は、一方が閉じた略筒状で、被覆導線２３が挿入される後端部１９以外の他の部位は封止される。なお、接合部２１および封止部１１は、例えばレーザ溶接やろう付け等によって接合および封止される。 The crimp portion 5 is formed by rounding the cylinder so as to have a circular cross section, and by abutting the side edges against each other and joining them at the joint portion 21 to be integrated. Further, a sealing portion 11 is provided on the front end side (terminal body 3 side) of the crimp portion 5. The covered conductive wire 23 is inserted from the open end side of the cylindrical crimp portion 5 . That is, the crimp portion 5 has a substantially cylindrical shape with one end closed, and the other portions other than the rear end portion 19 into which the covered conductive wire 23 is inserted are sealed. Note that the joint portion 21 and the sealing portion 11 are joined and sealed by, for example, laser welding, brazing, or the like.
圧着部５は、被覆導線２３の被覆部２７を圧着する被覆圧着部９と、被覆導線２３の先端部分において、被覆部が除去されて導線２５が露出した部位を圧着する導線圧着部７とからなる。すなわち、被覆部２７が剥離されて露出する導線２５は、導線圧着部７により圧着され、導線２５と端子１とが電気的に接続される。 The crimping section 5 includes a covered crimping section 9 that crimps the covering section 27 of the covered conductor wire 23, and a wire crimping section 7 that crimps a portion of the tip of the covered conducting wire 23 where the covering section is removed and the conducting wire 25 is exposed. Become. That is, the conducting wire 25 exposed by peeling off the covering portion 27 is crimped by the conducting wire crimping portion 7, and the conducting wire 25 and the terminal 1 are electrically connected.
なお、圧着部５の被覆導線２３が挿入される側の端部を後端部１９とする。すなわち、被覆導線２３は、被覆圧着部９の後端部１９から挿入される。また、側縁部同士を突き合せて接合された接合部２１が形成される側を上面とする。すなわち、接合部２１は、圧着部５の上面において、長手方向に沿って形成される。 Note that the end portion of the crimp portion 5 on the side into which the covered conductor wire 23 is inserted is referred to as the rear end portion 19. That is, the covered conductor 23 is inserted from the rear end 19 of the covered crimping part 9. Further, the side on which the joint portion 21 is formed by butting the side edges against each other is defined as the upper surface. That is, the joint portion 21 is formed on the upper surface of the crimp portion 5 along the longitudinal direction.
なお、導線圧着部７の内面の一部には、周方向に、図示を省略したセレーションが設けられる。このようにセレーションを形成することで、導線２５を圧着した際に、導線２５の表面の酸化膜を破壊しやすく、また、導線２５との接触面積を増加させることができる。 Note that serrations (not shown) are provided on a part of the inner surface of the conductive wire crimping portion 7 in the circumferential direction. By forming the serrations in this manner, when the conducting wire 25 is crimped, the oxide film on the surface of the conducting wire 25 is easily destroyed, and the contact area with the conducting wire 25 can be increased.
図３（ｂ）に示すように、被覆導線２３の長手方向に垂直な方向の、被覆圧着部９の断面形状は、高さＨよりも幅Ｗが広い扁平形状である。なお、前述したように、接合部２１が形成される側を上面とした図３（ｂ）において、上下方向を高さ方向とし、これと直交する左右方向を幅方向とする。 As shown in FIG. 3(b), the cross-sectional shape of the covering crimping portion 9 in the direction perpendicular to the longitudinal direction of the covering conducting wire 23 is a flat shape in which the width W is wider than the height H. As described above, in FIG. 3B, where the side where the joint portion 21 is formed is the top surface, the vertical direction is the height direction, and the left-right direction perpendicular thereto is the width direction.
なお、扁平形状としては、略楕円形状や略長円形状などが適用可能であるが、略全周にわたって曲線で構成される略楕円形状であることが望ましい。このように、断面が略楕円形状の場合には、縦横比＝幅Ｗ／高さＨは１６５％以下であることが望ましい。縦横比が１６５％を超えると、圧着後において、被覆部２７が被覆圧着部９の内面を押返す応力の周方向のバラつきが大きくなる。特に被覆圧着部９の幅方向の両端において、被覆部２７の反発力による止水性を得ることが難しくなる。 Note that as the flat shape, a substantially elliptical shape, a substantially elliptical shape, etc. can be applied, but a substantially elliptical shape having a curved line over substantially the entire circumference is preferable. In this way, when the cross section is approximately elliptical, it is desirable that the aspect ratio=width W/height H be 165% or less. If the aspect ratio exceeds 165%, after crimping, the stress caused by the covering portion 27 to push back the inner surface of the covering crimping portion 9 will vary widely in the circumferential direction. In particular, at both ends of the covering crimping portion 9 in the width direction, it becomes difficult to obtain water-stopping properties due to the repulsive force of the covering portion 27.
なお、扁平形状の縦横比は１１５％以上であることが望ましい。縦横比が１１５％未満では、前述したような、圧着部５の全高を低くする効果が小さくなる。なお、圧着部５の全高を低くする必要がなければ、被覆圧着部９の断面形状を扁平形状とせずに、略円形としてもよい。 Note that the aspect ratio of the flat shape is preferably 115% or more. If the aspect ratio is less than 115%, the effect of lowering the overall height of the crimp portion 5 as described above will be reduced. Note that if there is no need to reduce the overall height of the crimping part 5, the cross-sectional shape of the covering crimping part 9 may be substantially circular instead of being flat.
図２に示すように、端子付き電線１０の平面視において、圧着部５（被覆圧着部９）の後端部１９の一部は、被覆導線２３の長手方向に対して斜めに形成される。すなわち、端子付き電線１０の平面視において、被覆圧着部９の後端部１９は、被覆導線２３の長手方向に直交する方向に略直線状に形成されずに、部位によって被覆圧着部９の長さが異なる。より詳細には、被覆圧着部９の後端部１９において、平面視における幅方向の略中央の被覆圧着部９の長さが短く、幅方向の両側方に向かうにつれて徐々に被覆圧着部９の長さが長くなる。 As shown in FIG. 2, in a plan view of the electric wire 10 with a terminal, a part of the rear end 19 of the crimping part 5 (covered crimping part 9) is formed obliquely with respect to the longitudinal direction of the covered conductor 23. That is, in a plan view of the electric wire 10 with a terminal, the rear end portion 19 of the sheathing crimping portion 9 is not formed in a substantially straight line in a direction perpendicular to the longitudinal direction of the sheathed conductor 23, but the length of the sheathing crimping portion 9 varies depending on the portion. The quality is different. More specifically, in the rear end portion 19 of the covering crimping portion 9, the length of the covering crimping portion 9 is short at approximately the center in the width direction in plan view, and the length of the covering crimping portion 9 gradually increases toward both sides in the width direction. length becomes longer.
図４（ａ）は、被覆圧着部９の後端部近傍の平面拡大図である。ここで、被覆圧着部９の幅方向の略中央部において、被覆圧着部９の長さが最も短くなる部位を谷部２０とする。すなわち、被覆圧着部９の後端部１９において、谷部２０の部位と接合部２１の端部の位置とが略一致する。また、谷部２０から、幅方向の両端部に向かう被覆圧着部９の長さの変化部を傾斜部２２とする。 FIG. 4A is an enlarged plan view of the vicinity of the rear end of the covering crimping portion 9. FIG. Here, the portion where the length of the covering crimping part 9 is the shortest at approximately the center in the width direction of the covering crimping part 9 is defined as the trough 20 . That is, in the rear end portion 19 of the covering crimping portion 9, the position of the trough portion 20 and the position of the end portion of the joint portion 21 substantially coincide. Further, a portion where the length of the covering crimping portion 9 changes from the trough portion 20 toward both ends in the width direction is defined as an inclined portion 22 .
図４（ａ）に示すように、端子付き電線１０の被覆導線２３にせん断力（図中矢印Ｇ）が加わる場合を想定する。この場合、被覆圧着部９の後端部１９に傾斜部２２及び谷部２０がなく、幅方向に対して直線（力の向きと略同一方向に直線）の場合には、被覆圧着部９から露出する被覆部２７に略直線状のせん断力が付与される。これに対し、本実施形態では、被覆圧着部９の後端部１９に傾斜部２２及び谷部２０が形成されるため、せん断力が傾斜部２２の方向へも分散されるとともに、被覆圧着部９から露出する被覆部２７の線長も長くなるため、力が分散されて、被覆部２７へかかる力を緩和することができる。 As shown in FIG. 4A, a case is assumed in which a shearing force (arrow G in the figure) is applied to the covered conductor 23 of the electric wire 10 with a terminal. In this case, if the rear end 19 of the covering crimping part 9 does not have the slope part 22 and the trough 20 and is straight in the width direction (a straight line in substantially the same direction as the direction of force), the covering crimping part 9 can be A substantially linear shearing force is applied to the exposed covering portion 27. On the other hand, in this embodiment, since the inclined part 22 and the valley part 20 are formed at the rear end part 19 of the covering crimping part 9, the shearing force is also dispersed in the direction of the inclined part 22, and the covering crimping part Since the line length of the covering part 27 exposed from the covering part 9 is also increased, the force is dispersed and the force applied to the covering part 27 can be alleviated.
なお、端子付き電線１０の被覆導線２３に曲げ力（図中矢印Ｇ）が加わる場合も同様である。例えば、被覆圧着部９の後端部１９に傾斜部２２及び谷部２０がなく、幅方向に対して直線の場合には、曲げの内側となる部位の被覆圧着部９から露出する被覆部２７に力が集中するが、本実施形態では、曲げ力を傾斜部２２が受けることができるため（図中矢印Ｉ）、力が分散されて、被覆部２７へかかる局所的な力を緩和することができる。 The same applies when bending force (arrow G in the figure) is applied to the covered conductor 23 of the electric wire 10 with a terminal. For example, if the rear end 19 of the covering crimping part 9 does not have the slope part 22 and the valley part 20 and is straight in the width direction, the covering part 27 exposed from the covering crimping part 9 on the inside of the bend However, in this embodiment, since the inclined portion 22 can receive the bending force (arrow I in the figure), the force is dispersed and the local force applied to the covering portion 27 can be alleviated. I can do it.
また、図４（ｂ）に示すように、端子付き電線１０の被覆導線２３に引張力（図中矢印Ｋ）が加わる場合も同様である。この場合、被覆圧着部９の後端部１９に傾斜部２２及び谷部２０がなく、幅方向に対して直線の場合には、被覆圧着部９から露出する被覆部２７に略直線状の力が付与される。これに対し、本実施形態では、被覆圧着部９の後端部１９に傾斜部２２及び谷部２０が形成され、被覆圧着部９から露出する被覆部２７の線長が長くなるため、引張力への対抗力が傾斜部２２の方向に分散されて（図中矢印Ｊ）、被覆部２７へかかる力を緩和することができる。 Further, as shown in FIG. 4(b), the same applies when a tensile force (arrow K in the figure) is applied to the covered conductor 23 of the electric wire 10 with a terminal. In this case, if the rear end 19 of the covering crimping part 9 does not have the slope part 22 and the valley part 20 and is straight in the width direction, a substantially linear force is applied to the covering part 27 exposed from the covering crimping part 9. will be granted. On the other hand, in this embodiment, the inclined part 22 and the valley part 20 are formed at the rear end part 19 of the covering crimping part 9, and the line length of the covering part 27 exposed from the covering crimping part 9 becomes longer, so that the tensile force The force acting against the covering portion 27 is dispersed in the direction of the inclined portion 22 (arrow J in the figure), and the force applied to the covering portion 27 can be alleviated.
なお、このような谷部２０及び傾斜部２２は、被覆圧着部９の上面にのみ形成されればよい。すなわち、被覆圧着部９の幅方向の両側部から下面側に対しては、被覆圧着部９の長さ変化がなく（又は小さく）、後端部１９の形状が、被覆導線２３の長手方向に略垂直な略直線状であってもよい。このように、谷部２０及び傾斜部２２を被覆圧着部９の上面のみに形成することの理由は以下の通りである。 Incidentally, such valley portions 20 and slope portions 22 need only be formed on the upper surface of the covering crimping portion 9. That is, the length of the sheathing crimp portion 9 does not change (or is small) from both sides in the width direction of the sheathing crimp portion 9 to the lower surface side, and the shape of the rear end portion 19 changes in the longitudinal direction of the sheathed conductor 23. It may be a substantially vertical, substantially linear shape. The reason why the trough portion 20 and the slope portion 22 are formed only on the upper surface of the cover crimping portion 9 is as follows.
前述したように、被覆圧着部９の上面側には接合部２１が形成される。この接合部２１は、内面側に凸形状が形成される場合がある。このような内面に凸形状を有する部位においては、被覆部２７には特に力が集中しやすくなる。しかし、被覆圧着部９の上面側に谷部２０及び傾斜部２２を形成することで、当該部位近傍の被覆部２７へかかる力を効率良く分散させることができる。 As described above, the joint portion 21 is formed on the upper surface side of the covering and crimping portion 9 . This joint portion 21 may have a convex shape formed on the inner surface side. In such a portion having a convex shape on the inner surface, force is particularly likely to be concentrated on the covering portion 27. However, by forming the valley portion 20 and the slope portion 22 on the upper surface side of the covering crimping portion 9, the force applied to the covering portion 27 in the vicinity of the portion can be efficiently dispersed.
なお、谷部２０及び傾斜部２２を、被覆圧着部９の下面側にも形成してもよい。すなわち、被覆圧着部９の上下面において、幅方向の略中央部に谷部２０及び傾斜部２２を形成してもよい。 Note that the trough portion 20 and the slope portion 22 may also be formed on the lower surface side of the covering crimping portion 9. That is, on the upper and lower surfaces of the covering and crimping portion 9, the trough portion 20 and the slope portion 22 may be formed approximately at the center in the width direction.
ここで、被覆圧着部９の後端部１９において、幅方向の両端部の被覆圧着部９の長さと幅方向の略中央の被覆圧着部９の長さ（谷部２０における被覆圧着部９の長さ）の差（図２中Ｌ）は、被覆圧着部９の肉厚よりも大きいことが望ましい。また、被覆圧着部９の後端部１９において、上述した長さの差Ｌは、被覆部２７の厚さよりも大きいことが望ましい。このようにすることで、上述したような、力の分散効果を効率良く得ることができる。 Here, in the rear end part 19 of the covering crimping part 9, the length of the covering crimping part 9 at both ends in the width direction and the length of the covering crimping part 9 at approximately the center in the width direction (the length of the covering crimping part 9 at the valley part 20) It is desirable that the difference in length (L in FIG. 2) be larger than the thickness of the covering crimping portion 9. Further, in the rear end portion 19 of the covering crimping portion 9, it is desirable that the above-described length difference L is greater than the thickness of the covering portion 27. By doing so, it is possible to efficiently obtain the force dispersion effect as described above.
なお、長さの差Ｌをさらに大きくし、谷部２０における被覆圧着部９の長さを短くしすぎると、被覆圧着部９における止水性を確保することが困難となる。このため、谷部２０における被覆圧着部９の長さは、止水性を確保することができる範囲で設定される。 Note that if the length difference L is further increased and the length of the covering crimping portion 9 at the valley portion 20 is too short, it becomes difficult to ensure water-stopping properties in the covering crimping portion 9. Therefore, the length of the covering crimping portion 9 in the valley portion 20 is set within a range that can ensure water-stopping properties.
また、図示した例では、傾斜部２２は直線状であり、平面視における被覆圧着部９の後端部１９の形態が略Ｖ字状であるが、本発明はこれには限られない。例えば、傾斜部２２は、幅方向外側に膨らんだ曲線形状（すなわち略Ｕ字状）であってもよく、逆に幅方向の中心側に膨らんだ曲線形状であってもよい。 Further, in the illustrated example, the inclined portion 22 is linear, and the rear end portion 19 of the covering crimping portion 9 has a substantially V-shape in plan view, but the present invention is not limited to this. For example, the inclined portion 22 may have a curved shape that swells outward in the width direction (that is, a substantially U-shape), or may conversely have a curved shape that swells toward the center in the width direction.
次に、端子付き電線１０の製造方法について説明する。図５は、端子１へ被覆導線２３を挿入する前の状態を示す分解斜視図である。なお、圧着前の端子１の導線圧着部７は、被覆圧着部９に対して外径および内径が小さい。このように、導線圧着部７と被覆圧着部９の径をあらかじめ変えておき、より径の大きな被覆部２７を圧着する被覆圧着部９の内径を、より径の小さな導線２５を圧着する導線圧着部７の内径よりも大きくしておくことで、端子１の圧縮量を少なくすることができる。 Next, a method for manufacturing the electric wire 10 with a terminal will be described. FIG. 5 is an exploded perspective view showing the state before the covered conductor 23 is inserted into the terminal 1. Note that the conductor crimping portion 7 of the terminal 1 before crimping has a smaller outer diameter and inner diameter than the covering crimping portion 9. In this way, the diameters of the conductor crimping part 7 and the sheathing crimping part 9 are changed in advance, and the inner diameter of the sheathing crimping part 9, which crimp the sheathing part 27 with a larger diameter, is changed to the inside diameter of the sheathing crimping part 9, which crimp the conductor 25 with a smaller diameter. By making the inner diameter larger than the inner diameter of the portion 7, the amount of compression of the terminal 1 can be reduced.
まず、被覆導線２３の先端の所定長さの被覆部２７を剥離して、内部の導線２５を露出させる。次に、筒状の圧着部５に、後端部１９側から被覆導線２３の先端部を挿入する。この際、導線圧着部７の内部には導線２５の露出部が位置し、被覆圧着部９の内部には被覆部２７が位置する。すなわち、被覆部２７の端面は、被覆圧着部９と導線圧着部７の間に位置する。 First, a predetermined length of the covering portion 27 at the tip of the covered conducting wire 23 is peeled off to expose the internal conducting wire 25. Next, the tip of the coated conductive wire 23 is inserted into the cylindrical crimp portion 5 from the rear end 19 side. At this time, the exposed portion of the conducting wire 25 is located inside the conducting wire crimping section 7 , and the covering section 27 is located inside the covering crimping section 9 . That is, the end surface of the covering portion 27 is located between the covering crimping portion 9 and the conductor crimping portion 7.
図６（ａ）は、圧着前における金型３１ａ、３１ｂ等を示す断面図、図６（ｂ）は、圧着中の圧着部５を示す断面図である。金型３１ａは、長手方向に延びる略半円柱状の空洞を有し、被覆圧着部９に対応するとともに被覆圧着部９の半径よりも僅かに小さい径の被覆圧着刃型３４と、導線圧着部７に対応するとともに被覆圧着刃型３４よりも径の小さい導線圧着刃型３２とを備える。 FIG. 6(a) is a sectional view showing the molds 31a, 31b, etc. before crimping, and FIG. 6(b) is a sectional view showing the crimping part 5 during crimping. The mold 31a has a substantially semi-cylindrical cavity extending in the longitudinal direction, and has a covering crimping blade mold 34 which corresponds to the covering crimping part 9 and has a diameter slightly smaller than the radius of the covering crimping part 9, and a conductor crimping part. 7 and has a smaller diameter than the covering crimping blade 34.
図６（ｂ）に示すように、金型３１ａ、３１ｂを噛み合わせて、圧着部５を圧縮すると、導線圧着部７が導線２５に圧着され（図中Ｂ）、被覆圧着部９は、仮圧縮される（図中Ｃ）（第１圧着工程）。すなわち、金型３１ａ、３１ｂを用いた第１圧着工程は、導線圧着部７と導線２５を完全に圧着するとともに、被覆圧着部９と被覆部２７を仮圧縮するものである。 As shown in FIG. 6(b), when the molds 31a and 31b are engaged and the crimping part 5 is compressed, the conductor crimping part 7 is crimped to the conductor 25 (B in the figure), and the covering crimping part 9 is temporarily It is compressed (C in the figure) (first crimping step). That is, the first crimping step using the molds 31a and 31b completely crimps the wire crimping portion 7 and the conducting wire 25, and temporarily compresses the covering crimping portion 9 and the covering portion 27.
ここで、仮圧縮とは、被覆圧着部９をわずかに圧縮するものである。すなわち、被覆圧着部９の圧縮率は、１００％に近い数値であってもよい。ここで、被覆圧着部９の圧縮率とは、第１圧着工程前の被覆部２７における断面積（被覆部２７の外周面に対する内側の全断面積。以下同様。）をＡ０とし、金型３１ａ、３１ｂによって圧縮された後の被覆圧着部９の内部の断面積をＡ１とすると、圧縮率＝Ａ１／Ａ０（％）である。なお、仮圧縮工程では、被覆圧着部９の断面形状は扁平形状でなくてもよく、例えば略円形であってもよい。 Here, the temporary compression is to slightly compress the cover crimping portion 9. In other words, the compression ratio of the covering crimping portion 9 may be close to 100%. Here, the compression rate of the covering crimping part 9 is defined as A0, which is the cross-sectional area of the covering part 27 before the first crimping process (total cross-sectional area inside the covering part 27 with respect to the outer peripheral surface; the same applies hereinafter), and the mold 31a , 31b, the compression ratio=A1/A0 (%). In addition, in the temporary compression process, the cross-sectional shape of the covering crimping part 9 does not need to be flat, and may be approximately circular, for example.
次に、図７（ａ）に示すように、第１圧着工程後の端子付き電線を、金型３３ａ、３３ｂの間に配置する。金型３３ａ、３３ｂは、金型３１ａ、３１ｂとほぼ同様の構造であるが、被覆圧着刃型３４の径が異なる。金型３３ａ、３３ｂの被覆圧着刃型３４の内径は、金型３１ａ、３１ｂの被覆圧着刃型３４の内径よりも小さい。なお、金型３３ａ、３３ｂには、導線圧着刃型３２は不要である。 Next, as shown in FIG. 7(a), the electric wire with a terminal after the first crimping process is placed between the molds 33a and 33b. The molds 33a and 33b have almost the same structure as the molds 31a and 31b, but the diameter of the cover crimping blade mold 34 is different. The inner diameter of the covered crimping blade 34 of the molds 33a, 33b is smaller than the inner diameter of the covered crimping blade 34 of the molds 31a, 31b. Note that the conductor crimping blade mold 32 is not necessary for the molds 33a and 33b.
次に、図７（ｂ）に示すように、金型３３ａ、３３ｂを噛み合わせて、圧着部５を圧縮すると、被覆圧着部９が強圧着される（図中Ｄ）（第２圧着工程）。すなわち、被覆圧着部９が本圧着される。圧着後の被覆圧着部９の内部（被覆部２７）の断面積をＡ２とすると、Ａ２／Ａ０が、最終的な被覆部２７の圧縮率となる。最終的な圧縮率は、被覆が破れるのを抑制するため、５０％以上であるのが好ましく、圧着部の密着性を確保するため、８５％以下であるのが好ましい。 Next, as shown in FIG. 7(b), when the molds 33a and 33b are engaged and the crimping part 5 is compressed, the covering crimping part 9 is strongly crimped (D in the figure) (second crimping step) . That is, the covering crimping portion 9 is fully crimped. If the cross-sectional area of the inside of the covering crimping part 9 (covering part 27) after crimping is A2, then A2/A0 becomes the final compression ratio of the covering part 27. The final compression rate is preferably 50% or more in order to prevent the coating from tearing, and is preferably 85% or less in order to ensure the adhesion of the crimped portion.
このように、金型３３ａ、３３ｂによる圧着後には、被覆圧着部９の内面と被覆部２７の外面との密着によって圧着部５を封止することができる。この際、圧着部５の後端部１９以外の他の部位は、接合部２１および封止部１１によって水密に封止されるため、圧着部５への水分の浸入を防止することができる。 In this way, after the crimping by the molds 33a and 33b, the crimping part 5 can be sealed by the close contact between the inner surface of the covering crimping part 9 and the outer surface of the covering part 27. At this time, other parts of the crimping part 5 other than the rear end 19 are watertightly sealed by the joining part 21 and the sealing part 11, so that moisture can be prevented from entering the crimping part 5.
ここで、金型３３ａ、３３ｂの長さ（被覆導線２３の長手方向に対応する長さ）は、被覆圧着部９よりも長い。すなわち、被覆圧着部９の後方に金型３３ａ、３３ｂがはみ出した状態で第２圧着工程が行われる。このように、被覆圧着部９の後方に金型３３ａ、３３ｂがはみ出した状態で第２圧着工程を行う理由は以下の通りである。 Here, the length of the molds 33a and 33b (the length corresponding to the longitudinal direction of the covered conductive wire 23) is longer than the covered crimping portion 9. That is, the second crimping process is performed in a state where the molds 33a and 33b protrude behind the cover crimping part 9. The reason why the second crimping process is performed in a state where the molds 33a and 33b protrude behind the cover crimping part 9 is as follows.
被覆圧着部９を強圧着すると、被覆圧着部９の金属は、後方へ伸びようとする。この際、被覆圧着部９の後方に金型３３ａ、３３ｂがあると、金型３３ａ、３３ｂとの摩擦力によって、この伸びが抑制される。この際、金型３３ａ、３３ｂとの摩擦抵抗が大きな部位は、相対的に伸びが強く抑制され、金型３３ａ、３３ｂとの摩擦抵抗が小さい部位は、相対的に伸び量が多くなる。 When the cover crimping part 9 is strongly crimped, the metal of the cover crimping part 9 tends to extend rearward. At this time, if the molds 33a and 33b are located behind the covering crimping portion 9, this elongation is suppressed by the frictional force with the molds 33a and 33b. At this time, the elongation is relatively strongly suppressed in areas where the frictional resistance with the molds 33a and 33b is large, and the amount of elongation is relatively large in the areas with small frictional resistance with the molds 33a and 33b.
本実施形態では、被覆圧着部９の上面には接合部２１が形成される。接合部２１は、例えば溶接によって形成されるが、この部位の表面には細かな凹凸が形成されるため、金型３３ａ、３３ｂとの摩擦抵抗が他の部位と比較して大きくなる。また、金型３３ａ、３３ｂからの圧縮力を最も強く受けるのは、被覆圧着部９の上面側となるため、接合部２１近傍では、より大きな摩擦抵抗を受けることとなる。このため、接合部２１における後方への伸び量が他の部位における後方への伸び量よりも小さくなる。すなわち、第２圧着工程においては、接合部２１近傍の被覆圧着部９の後方への伸び量を、接合部２１以外の部位の被覆圧着部９の後方への伸び量より小さくすることができる。このため、接合部２１において谷部２０を形成することができる。 In this embodiment, a bonding portion 21 is formed on the upper surface of the cover crimping portion 9 . The joint portion 21 is formed by, for example, welding, but since fine irregularities are formed on the surface of this portion, the frictional resistance with the molds 33a and 33b is greater than that of other portions. Furthermore, since the upper surface side of the covering crimping portion 9 receives the strongest compressive force from the molds 33a and 33b, the area near the joint portion 21 receives greater frictional resistance. Therefore, the amount of rearward expansion at the joint portion 21 is smaller than the amount of rearward expansion at other parts. That is, in the second crimping step, the amount of rearward expansion of the covering crimping portion 9 near the joint portion 21 can be made smaller than the amount of rearward expansion of the covering crimping portion 9 at a portion other than the joining portion 21 . Therefore, the valley portion 20 can be formed in the joint portion 21.
なお、導線圧着部７を圧着する際には、端子１の導体が被覆圧着部９側に伸びる。このため、２段階圧着を行わないと、被覆圧着部９の内部の被覆部２７が、被覆圧着部９の伸びに追従しながら強圧着される。この結果、被覆部２７は、被覆圧着部９による断面中心方向に向けた圧縮だけでなく、軸方向にずれながら圧縮される。このため、被覆部２７に対する管軸方向に垂直な方向への圧縮力が軸方向に逃げてしまい、十分な圧縮力を得られない恐れがある。 In addition, when the conductor crimping part 7 is crimped, the conductor of the terminal 1 extends toward the covering crimping part 9 side. Therefore, unless two-step crimping is performed, the covering portion 27 inside the covering crimping portion 9 will be strongly crimped while following the elongation of the covering crimping portion 9. As a result, the covering portion 27 is not only compressed in the direction of the center of the cross section by the covering crimping portion 9, but also compressed while shifting in the axial direction. For this reason, the compressive force applied to the covering portion 27 in the direction perpendicular to the tube axis direction escapes in the axial direction, and there is a possibility that sufficient compressive force cannot be obtained.
これに対し、本実施形態では、導線圧着部７を圧着する際には、被覆圧着部９は仮圧着されるのみであり、被覆圧着部９に対して被覆部２７の多少の移動が許容される。このため、導線圧着部７を圧着する際に、被覆部２７の軸方向へのずれ等を吸収可能である。したがって、被覆部２７が安定した状態で、被覆部２７を強圧着することができる。特に、本実施形態のように、被覆圧着部９の後方において、伸び量が部位よって異なる場合でも、被覆部２７の切れ等を抑制することができる。 In contrast, in this embodiment, when the conductor crimping part 7 is crimped, the sheathing crimping part 9 is only temporarily crimped, and some movement of the sheathing part 27 with respect to the sheathing crimping part 9 is allowed. Ru. Therefore, when the conducting wire crimping portion 7 is crimped, it is possible to absorb displacement of the covering portion 27 in the axial direction. Therefore, the covering portion 27 can be strongly compressed while the covering portion 27 is in a stable state. Particularly, as in the present embodiment, even if the amount of elongation differs depending on the region behind the covering crimping section 9, breakage of the covering section 27 can be suppressed.
なお、上述した例では、２段階圧着を行ったが、被覆部２７に損傷なく１回の圧着により谷部２０を形成可能であれば１回の圧着でも良い。また、谷部２０の形成は、被覆圧着工程と同時でなくてもよい。例えば、端子１を形成する際に、予め谷部形状を形成しておけば、被覆圧着部９の後方にはみ出すような金型を用いなくても、谷部２０を形成することができる。 In the above example, two-step crimping was performed, but one crimping may be used as long as the trough 20 can be formed in one crimping without damaging the covering portion 27. Furthermore, the formation of the troughs 20 does not have to be done simultaneously with the coating and pressure bonding process. For example, if the trough shape is formed in advance when forming the terminal 1, the trough 20 can be formed without using a mold that protrudes behind the cover crimping part 9.
以上、本実施の形態によれば、被覆圧着部９の後端部１９に谷部２０と傾斜部２２が設けられるため、端子付き電線１０の被覆導線２３に力が加わった場合において、被覆部２７に局所的にかかる力を緩和することができる。 As described above, according to the present embodiment, since the trough portion 20 and the slope portion 22 are provided at the rear end portion 19 of the sheathed crimping portion 9, when force is applied to the sheathed conductor wire 23 of the electric wire 10 with a terminal, the sheathed portion The force locally applied to 27 can be alleviated.
このような効果は、被覆圧着部９の断面形状を扁平形状とした場合に特に顕著に得ることができる。また、このような効果は、圧着部５の上面に、長手方向に沿って接合部２１が形成される場合に特に顕著に得ることができる。 Such an effect can be particularly remarkable when the cross-sectional shape of the covering and crimping portion 9 is made into a flat shape. Moreover, such an effect can be obtained particularly significantly when the joint part 21 is formed on the upper surface of the crimp part 5 along the longitudinal direction.
以上、添付図を参照しながら、本発明の実施の形態を説明したが、本発明の技術的範囲は、前述した実施の形態に左右されない。当業者であれば、特許請求の範囲に記載された技術的思想の範疇内において各種の変更例または修正例に想到し得ることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。 Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical scope of the present invention is not limited to the embodiments described above. It is clear that those skilled in the art can come up with various changes and modifications within the scope of the technical idea stated in the claims, and these naturally fall within the technical scope of the present invention. It is understood that it belongs.
１………端子
３………端子本体
５………圧着部
７………導線圧着部
９………被覆圧着部
１０………端子付き電線
１１………封止部
１５………弾性接触片
１７………前端部
１９………後端部
２０………谷部
２１………接合部
２２………傾斜部
２３………被覆導線
２５………導線
２７………被覆部
３１ａ、３１ｂ、３３ａ、３３ｂ………金型
３２………導線圧着刃型
３４………被覆圧着刃型
1...Terminal 3...Terminal body 5...Crimping part 7...Conductor crimping part 9...Sheathing crimping part 10...Electric wire with terminal 11...Sealing part 15...Elasticity Contact piece 17...Front end 19...Rear end 20...Trough 21...Joint section 22...Slanted section 23...Coated conductor 25...Conductor 27...Coated section 31a, 31b, 33a, 33b...Mold 32...Conductor crimping blade type 34...Coated crimping blade type
Claims (5)
前記端子は、前記被覆導線が圧着される圧着部と、端子本体とを有し、
前記圧着部は、前記被覆導線の被覆部を圧着する被覆圧着部と、前記被覆導線の先端部において前記被覆部から露出する導線を圧着する導線圧着部とを有し、前記被覆導線が挿入される部位を除き、他の部位が封止されており、
前記被覆圧着部の後端部において、平面視における幅方向の略中央の前記被覆圧着部の長さが短く、幅方向の両側方に向かうにつれて徐々に前記被覆圧着部の長さが長くなり、
前記被覆圧着部の後端部において、幅方向の両端部の前記被覆圧着部の長さと幅方向の略中央の前記被覆圧着部の長さの差が、前記被覆部の厚さよりも大きいことを特徴とする端子付き電線。 An electric wire with a terminal in which a covered conductor and a terminal are connected,
The terminal has a crimping part to which the covered conductor is crimped, and a terminal main body,
The crimping part includes a covered crimping part that crimps the covering part of the covered conductive wire, and a conductor crimping part that crimps the conducting wire exposed from the covering part at the tip of the covered conducting wire, and the covered conducting wire is inserted into the crimping part. The other parts are sealed except for the part where the
At the rear end portion of the covering crimping portion, the length of the covering crimping portion approximately at the center in the width direction in plan view is short, and the length of the covering crimping portion gradually increases toward both sides in the width direction. ,
At the rear end portion of the covering crimping portion, the difference between the length of the covering crimping portion at both ends in the width direction and the length of the covering crimping portion approximately at the center in the width direction is greater than the thickness of the covering portion. Features electric wires with terminals.
前記被覆圧着部の後端部において、平面視における幅方向の略中央の前記被覆圧着部の長さが短い部位が、前記接合部の端部の位置と略一致することを特徴とする請求項１から請求項３のいずれかに記載の端子付き電線。 A joint part is formed along the longitudinal direction on the upper surface of the crimp part,
In the rear end portion of the covering crimping portion, a portion having a shorter length of the covering crimping portion at approximately the center in the width direction in a plan view substantially coincides with a position of an end portion of the joint portion. An electric wire with a terminal according to any one of claims 1 to 3 .
前記端子は、前記被覆導線が圧着される圧着部と、端子本体とを有し、
前記圧着部は、前記被覆導線の被覆部を圧着する被覆圧着部と、前記被覆導線の先端部において前記被覆部から露出する導線を圧着する導線圧着部とを有し、前記被覆導線が挿入される部位を除き、他の部位が封止されており、
前記圧着部の上面には、長手方向に沿って接合部が形成され、
前記圧着部に前記被覆導線を挿入し、
前記導線圧着部と前記導線を圧着するとともに、前記被覆圧着部と前記被覆部を仮圧着する第１圧着工程と、
前記第１圧着工程の後、前記被覆圧着部と、前記被覆部を強圧着する第２圧着工程と、
を具備し、
前記第２圧着工程における金型の長さが、前記被覆圧着部よりも長く、前記被覆圧着部の後方に前記金型がはみ出した状態で前記第２圧着工程を行い、
前記第２圧着工程において、前記接合部の前記被覆圧着部の後方への伸び量を、前記接合部以外の前記被覆圧着部の後方への伸び量より小さくすることを特徴とする端子付き電線の製造方法。 A method for manufacturing an electric wire with a terminal in which a covered conductor and a terminal are connected,
The terminal has a crimping part to which the covered conductor is crimped, and a terminal main body,
The crimping part includes a covered crimping part that crimps the covering part of the covered conductive wire, and a conductor crimping part that crimps the conducting wire exposed from the covering part at the tip of the covered conducting wire, and the covered conducting wire is inserted into the crimping part. The other parts are sealed except for the part where the
A joint part is formed along the longitudinal direction on the upper surface of the crimp part,
Inserting the covered conductor into the crimping part,
a first crimping step of crimping the conducting wire crimping part and the conducting wire, and temporarily crimping the covering crimping part and the covering part;
After the first crimping step, a second crimping step of strongly crimping the covering crimping portion and the covering portion;
Equipped with
The length of the mold in the second crimping step is longer than the covering crimping part, and the second crimping step is performed in a state where the mold protrudes behind the covering crimping part,
In the second crimping step, the amount of rearward extension of the covered crimped portion of the joint portion is made smaller than the amount of rearward extension of the covered crimped portion other than the bonded portion. Production method.
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| JP2004071437A (en) | 2002-08-08 | 2004-03-04 | Sumitomo Wiring Syst Ltd | Grounding terminal for automobile and waterproof connection structure of wire |
| JP2014049334A (en) | 2012-08-31 | 2014-03-17 | Furukawa Electric Co Ltd:The | Method of manufacturing crimp terminal, crimp terminal, and wire harness |
| JP2015050038A (en) | 2013-09-02 | 2015-03-16 | 住友電装株式会社 | Terminal fitting |
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