JP2012221719A

JP2012221719A - Crimp terminal

Info

Publication number: JP2012221719A
Application number: JP2011086007A
Authority: JP
Inventors: Osamu Okuyama; 修奥山; Kazuo Iura; 一雄井浦; Norio Kato; 範雄加藤
Original assignee: ASUKA BUSINESS Corp KK
Current assignee: ASUKA BUSINESS Corp KK
Priority date: 2011-04-08
Filing date: 2011-04-08
Publication date: 2012-11-12

Abstract

PROBLEM TO BE SOLVED: To provide a crimp terminal which can decrease the contact resistance to a wire conductor sufficiently, and can be molded easily of a terminal material.SOLUTION: In the crimp terminal 1 having a conductor crimp part 2 being crimped to the outer periphery of an uncoated wire conductor, a plurality of recesses 24 extending in a direction orthogonal to the wire conductor are formed in parallel on a crimp surface 2a of the conductor crimp part 2 which comes into contact with the wire conductor when being crimped. The recesses 24 and protrusions 23 therebetween have a substantially triangular section.

Description

本発明は圧着端子に関し、特に、その導体圧着部の接触抵抗を小さくできる圧着端子に関する。 The present invention relates to a crimp terminal, and more particularly to a crimp terminal capable of reducing the contact resistance of a conductor crimping portion.

この種の圧着端子として例えば特許文献１に示すものが知られている。ここでは、電線導体の外周に圧着される導体圧着部の圧着面に、電線導体が延びる方向と直交する方向へ複数の凹溝が平行に形成されている。これら凹溝は開放方向へ略逆台形断面をなすように形成されており、凹溝の開放縁に稜部が形成されている。このような構造により、電線導体を圧着する際には、上記稜部のエッジによって電線導体の表面酸化膜が剥がされて接触抵抗が低減される。 As this type of crimp terminal, for example, one shown in Patent Document 1 is known. Here, a plurality of concave grooves are formed in parallel in a direction orthogonal to the direction in which the wire conductor extends on the crimping surface of the conductor crimping portion that is crimped to the outer periphery of the wire conductor. These concave grooves are formed so as to have a substantially inverted trapezoidal cross section in the opening direction, and a ridge is formed at the open edge of the concave groove. With such a structure, when crimping the electric wire conductor, the surface oxide film of the electric wire conductor is peeled off by the edge of the ridge portion, and the contact resistance is reduced.

特開２０１０−９７８９JP 2010-9789

しかし、上記特許文献１に記載された従来の圧着端子では、凹溝が略逆台形断面となっているため、圧着時にこの断面形状に沿って電線導体を凹溝内に隙無く押し込むことは困難で、このため接触抵抗の低減が未だ不十分であるという問題があった。また、略逆台形断面の凹溝は底面が平面となっているためプレス成型に過大な圧力を必要とし、安定したプレス成型が困難であるという問題もあった。 However, in the conventional crimp terminal described in Patent Document 1, since the concave groove has a substantially inverted trapezoidal cross section, it is difficult to push the electric wire conductor into the concave groove along the cross-sectional shape during crimping without a gap. Therefore, there is a problem that the contact resistance is still insufficiently reduced. In addition, since the concave groove having a substantially inverted trapezoidal cross section has a flat bottom surface, excessive pressure is required for press molding, and there is a problem that stable press molding is difficult.

そこで、本発明はこのような課題を解決するもので、電線導体との接触抵抗を充分小さくでき、かつ端子材料からの成形が容易な圧着端子を提供することを目的とする。 Therefore, the present invention solves such a problem, and an object of the present invention is to provide a crimp terminal that can sufficiently reduce the contact resistance with a wire conductor and can be easily molded from a terminal material.

上記課題を解決するために本第１発明では、被覆（４１）を除去した電線導体（４２）の外周に圧着固定される導体圧着部（２）を備える圧着端子（１）であって、圧着時に前記電線導体（４２）に接触する前記導体圧着部（２）の圧着面（２ａ）の少なくとも一部に一方向へ延びる凹条（２４）を平行に複数形成し、前記凹条（２４）およびこれらの間に生じる凸条（２３）の断面形状を、実質的に三角断面とする。ここで、「実質的」とは、プレス成型等で凹条および凸条を形成する場合に三角断面の頂部が尖った形状にならず、平らになることがあるからである。 In order to solve the above-described problem, the first invention is a crimp terminal (1) including a conductor crimping portion (2) that is crimped and fixed to the outer periphery of the wire conductor (42) from which the coating (41) has been removed. Sometimes, a plurality of recesses (24) extending in one direction are formed in parallel on at least a part of the crimping surface (2a) of the conductor crimping part (2) that contacts the wire conductor (42), and the recesses (24) The cross-sectional shape of the ridge (23) generated between them is substantially a triangular cross section. Here, “substantially” is because when the concave and convex ridges are formed by press molding or the like, the top of the triangular cross section does not have a sharp shape but may become flat.

本第１発明において、三角断面の凸条は圧着時に頂部は潰れるものの、凸条の斜面が残ってこれに沿って電線導体が隣接する凹条に向けて円滑に塑性変形し広い接触面積が確保される。この結果、接触抵抗が充分小さくなる。また、三角断面の凸条は電線導体に良く食い込むから電線固定力が向上する。さらに三角断面の凹条は従来の略逆台形断面の凹溝等に比してプレス成型に過大な圧力を要さず、成型が容易である。 In the first aspect of the present invention, the convex portion of the triangular cross-section is crushed at the time of crimping, but the slope of the convex portion remains, along which the wire conductor smoothly plastically deforms toward the adjacent concave portion to ensure a wide contact area. Is done. As a result, the contact resistance becomes sufficiently small. In addition, since the triangular cross-section ridges bite into the wire conductor well, the wire fixing force is improved. Further, the concave groove having a triangular cross section does not require excessive pressure for press molding as compared with the conventional concave groove having a substantially inverted trapezoidal cross section, and is easy to mold.

本第２発明では、前記凹条（２３）を、前記電線導体（４２）が延びる方向と交差する方向へ形成する。 In this 2nd invention, the said groove (23) is formed in the direction which cross | intersects the direction where the said electric wire conductor (42) is extended.

本第２発明においては、凹条の間に生じる三角断面の凸条が電線導体を横切ってこれに食い込み、この際の余肉が隣接する凹条に向けて円滑に押し込まれてさらに電線固定力が向上し、かつ電線導体の延びる方向から侵入する空気や水をより効果的に遮断することができる。 In the second aspect of the present invention, the triangular cross-section ridge generated between the ridges cuts into the wire conductor, and the surplus at this time is smoothly pushed toward the adjacent ridges to further fix the wire. The air and water entering from the direction in which the wire conductor extends can be blocked more effectively.

本第３発明では、前記凸条（２３）の断面形状を、先端（２３１）を頂部とする二等辺三角断面とする。 In this 3rd invention, let the cross-sectional shape of the said protruding item | line (23) be an isosceles triangular cross section which makes a front-end | tip (231) a top.

本第３発明において、二等辺三角断面の凸条は圧着力を受けても潰れ難く、電線導体との広い接触面積が確保されて接触抵抗がより小さくなる。また、電線導体への食い込みも良いから電線固定力も向上する。加えて、プレス成型する際に端子材料が左右均等に流動するから成型がさらに容易となる。 In the third aspect of the invention, the ridges having an isosceles triangular cross section are not easily crushed even when subjected to a crimping force, and a wide contact area with the electric wire conductor is ensured, resulting in a smaller contact resistance. Further, since the bite into the electric wire conductor is good, the electric wire fixing force is also improved. In addition, since the terminal material flows evenly on the left and right when press molding, molding becomes easier.

本第４発明は前記圧着端子の製造方法であって、型面に前記一方向へ延びる三角断面の凸条（Ｍ１）を隣接させて平行に複数形成したプレス金型（Ｍ）によって端子板材の板面を塑性変形させる。 The fourth invention is a method of manufacturing the crimp terminal, wherein the terminal plate material is formed by a press mold (M) in which a plurality of parallel protrusions (M1) having a triangular cross section extending in one direction are adjacent to the mold surface. The plate surface is plastically deformed.

本第４発明においては、端子板材の表面に複数の凹条と凸条を比較的小さいプレス圧力で同時かつ容易に形成することができる。 In the fourth aspect of the present invention, a plurality of concave stripes and convex stripes can be simultaneously and easily formed on the surface of the terminal plate material with a relatively small pressing pressure.

上記カッコ内の符号は、後述する実施形態に記載の具体的手段との対応関係を示すものである。 The reference numerals in the parentheses indicate the correspondence with specific means described in the embodiments described later.

以上のように、本発明の圧着端子によれば、電線導体との接触抵抗を充分小さくできるとともに、端子材料からの成形も容易である。 As described above, according to the crimp terminal of the present invention, the contact resistance with the electric wire conductor can be sufficiently reduced, and molding from the terminal material is easy.

本発明の一実施形態における電線圧着前の圧着端子の斜視図である。It is a perspective view of the crimp terminal before electric wire crimping in one embodiment of the present invention. 図１のII−II線に沿った拡大断面図である。It is an expanded sectional view along the II-II line of FIG. 凹条とこれらの間に生じる凸条の拡大断面図である。It is an expanded sectional view of a ridge and the ridge produced between these. 電線圧着状態の圧着端子の斜視図である。It is a perspective view of the crimp terminal in the electric wire crimp state. 電線圧着状態における圧着端子の要部拡大断面図である。It is a principal part expanded sectional view of the crimp terminal in an electric wire crimping state.

図１には本発明を適用した圧着端子の一例を示す。なお、以下に説明する実施形態はあくまで一例であり、本発明の要旨を逸脱しない範囲で当業者が行う種々の設計的改良も本発明の範囲に含まれる。 FIG. 1 shows an example of a crimp terminal to which the present invention is applied. The embodiment described below is merely an example, and various design improvements made by those skilled in the art without departing from the gist of the present invention are also included in the scope of the present invention.

図１に示す圧着端子１はいわゆる丸形（ＬＡ）端子で、長手方向に延びる本体部１１と先端部１２で構成されている。このような圧着端子は、例えば黄銅、銅、鉄等の板材をプレス加工して成形されており、先端部１２は略円形に成形されてその中心に接続用の通孔１３が形成されている。 The crimp terminal 1 shown in FIG. 1 is a so-called round (LA) terminal, and is composed of a main body portion 11 and a tip portion 12 extending in the longitudinal direction. Such a crimp terminal is formed by pressing a plate material such as brass, copper, or iron, for example, and the tip end portion 12 is formed in a substantially circular shape, and a connection through hole 13 is formed at the center thereof. .

圧着端子１の本体部１１には、頭部１２に近い位置に導体圧着部（ワイヤーバレル）２が形成されるとともに、頭部１２から遠い本体部１１の基端には絶縁圧着部（インシュレーションバレル）３が形成されている。導体圧着部２および絶縁圧着部３は共に、これらの部分で幅広とした板材の両端を上方へ屈曲させて左右の側壁２１，２２，３１，３２を有する略Ｕ字状に成形したものである。このうち、導体圧着部２にはＵ字形の内面である圧着面２ａの全面に多数の凹条２４と凸条２３が形成されている。 A conductor crimping part (wire barrel) 2 is formed in the main body part 11 of the crimping terminal 1 at a position close to the head 12, and an insulating crimping part (insulation) is provided at the base end of the main body part 11 far from the head 12. Barrel) 3 is formed. Both the conductor crimping part 2 and the insulating crimping part 3 are formed in a substantially U shape having left and right side walls 21, 22, 31, 32 by bending both ends of a plate material wide at these parts upward. . Among them, the conductor crimping portion 2 has a large number of concave stripes 24 and convex stripes 23 formed on the entire crimping surface 2a which is a U-shaped inner surface.

凹条２４は圧着端子１の本体部１１を横切るようにその幅方向へ延び、これら凹条の間に凸条２３が生じて、互いに隣接して延びている。図２に示すように、凹条２４およびこれらの間の凸条２３は、型面に三角断面の凸条Ｍ１を隣接させて平行に複数形成したプレス金型Ｍによって端子板材の板面を押圧し塑性変形させることによって形成されている。 The concave strip 24 extends in the width direction so as to cross the main body portion 11 of the crimp terminal 1, and a convex strip 23 is formed between the concave strips and extends adjacent to each other. As shown in FIG. 2, the concave stripes 24 and the convex stripes 23 between them press the plate surface of the terminal plate material by a press mold M in which a plurality of parallel projections M1 having a triangular cross section are formed adjacent to the mold surface. It is formed by plastic deformation.

凹条２４とこれらの間に生じる凸条２３の断面は、本実施形態では図３に示すように先端２３１，２４１を頂部とする二等辺三角断面としてあり、各凹条２４の谷の頂角θとこれに隣接する凸条２３の山の頂角θは等しくなっている。なお、頂角θは９０度〜６０度の範囲で適宜選択される。頂角θを上記範囲に設定することにより、圧着力を受けて凸条２３の先端２３１が過度に潰れるのを防止することができるとともに、電線導体４２への凸条２３の食い込みも良好に行われ、しかも電線導体４２を凸条２３に隣接する凹条２４へ良好に押し込むことができる。 In this embodiment, as shown in FIG. 3, the cross section of the ridges 24 and the ridges 23 formed between them is an isosceles triangular cross section with the ends 231 and 241 as the tops, and the apex angles of the valleys of the respective ridges 24 θ and the apex angle θ of the ridge 23 adjacent to the ridge 23 are equal. The apex angle θ is appropriately selected within a range of 90 degrees to 60 degrees. By setting the apex angle θ in the above range, it is possible to prevent the tip 231 of the ridge 23 from being excessively crushed due to the pressure-bonding force, and the ridge 23 can be well bitten into the wire conductor 42. In addition, the electric wire conductor 42 can be pushed well into the recess 24 adjacent to the protrusion 23.

なお、図３は理解を容易にするために圧着端子１の本体部１１の板厚と凸条２３や凹条２４の大きさを実際とは異なる比率で描いてある。実際には各凹条２４の深さ、すなわちこれに隣接する凸条２３の高さＨは、導体圧着部２の板厚の３０％を超えないようにするのが良い。こうすることによって、圧着後の電線導体の締付け強度を十分確保することができる。さらに、上記各凸条２３の高さＨは、圧着する電線導体の直径の７０％を超えないようにするのが良い。圧着後の電線導体の強度を低下させないためである。凹条２４の一例は、本体部１１の板厚が２．０ｍｍの場合、その深さ（凸条２３の高さＨ）を０．６ｍｍとする。 In FIG. 3, for ease of understanding, the thickness of the main body 11 of the crimp terminal 1 and the sizes of the ridges 23 and the ridges 24 are drawn at a ratio different from the actual one. Actually, the depth of each recess 24, that is, the height H of the protrusion 23 adjacent to the recess 24 should not exceed 30% of the plate thickness of the conductor crimping portion 2. By doing so, it is possible to sufficiently secure the tightening strength of the wire conductor after crimping. Furthermore, it is preferable that the height H of each ridge 23 does not exceed 70% of the diameter of the wire conductor to be crimped. This is because the strength of the wire conductor after crimping is not lowered. An example of the concave stripe 24 has a depth (height H of the convex stripe 23) of 0.6 mm when the plate thickness of the main body 11 is 2.0 mm.

このような構造の圧着端子に対して、図４に示すように、先端の絶縁被覆４１を除去して一定長さで電線導体（芯線）４２を露出させた撚線電線４を、圧着端子１の本体部１１に沿わせてその基端方向から絶縁圧着部３と導体圧着部２のＵ字空間内に通す。この状態で導体圧着部２に形成された凹条２４および凸条２３（図１）は電線導体４２とほぼ直交するように延びている。 With respect to the crimp terminal having such a structure, as shown in FIG. 4, the stranded wire 4 in which the insulating coating 41 at the tip is removed and the wire conductor (core wire) 42 is exposed with a certain length is connected to the crimp terminal 1. The insulating crimping part 3 and the conductor crimping part 2 are passed through the U-shaped space from the base end direction along the main body part 11. In this state, the concave strip 24 and the convex strip 23 (FIG. 1) formed in the conductor crimping portion 2 extend so as to be substantially orthogonal to the wire conductor 42.

この後、圧着工具によって、絶縁圧着部３の左右の側壁３１，３２を絶縁被覆４１の外周を抱持するように屈曲させてこれに圧着させるとともに（図４の状態）、導体圧着部２の左右の側壁２１，２２を電線導体４２の外周を抱持するように屈曲させてこれに圧着させる。なお、電線導体４２部の圧着圧縮率は６０〜８０％とするのが良い。 Thereafter, the right and left side walls 31 and 32 of the insulating crimping portion 3 are bent so as to hold the outer periphery of the insulating coating 41 and crimped to the crimping tool (state of FIG. 4), and the conductor crimping portion 2 The left and right side walls 21 and 22 are bent so as to hold the outer periphery of the electric wire conductor 42 and are crimped thereto. In addition, it is good for the crimping | compression-bonding compression rate of the wire conductor 42 part to be 60 to 80%.

導体圧着部２が圧着されると、圧着面２ａに接する電線導体４２の側面（図５の下面）の長手方向複数個所で、三角断面の各凸条２３の尖った先端が余肉を左右両側の凹条２４に向けて塑性流動させつつ電線側面に食い込む。各凸条２３の先端は圧着に伴って押し潰されるものの、電線導体４２への食い込みは良好に行われ、これによって電線導体４２の固定が確実に行われる。同時に、凸条２３および凹条２４と電線導体４２との広い面積での接触が確保されて接触抵抗が十分低減される。ちなみに、従来構造に比して本実施形態の圧着端子の電線導体固定力は１０％程度向上し、接触抵抗は３０％程度低下し向上した。なお、図５は凸条２３および凹条２４に接する電線導体４２のみを断面で描いてある。 When the conductor crimping portion 2 is crimped, the sharp tips of the ridges 23 of the triangular cross-section at each of the longitudinal sides of the side surface (the lower surface in FIG. 5) of the wire conductor 42 in contact with the crimping surface 2a It bites into the side surface of the electric wire while plastically flowing toward the recess 24 of the wire. Although the tips of the ridges 23 are crushed along with the pressure bonding, the wire conductors 42 are bite well, and the wire conductors 42 are securely fixed. At the same time, contact over a wide area between the ridges 23 and 24 and the wire conductor 42 is ensured, and the contact resistance is sufficiently reduced. Incidentally, the wire conductor fixing force of the crimp terminal of this embodiment is improved by about 10% and the contact resistance is reduced by about 30% and improved as compared with the conventional structure. In FIG. 5, only the wire conductor 42 in contact with the ridges 23 and the ridges 24 is shown in cross section.

なお、本実施形態では板材をプレス成型することによって凹条および凸条を形成したが、プレス成型以外の加工方法で製造しても良い。 In the present embodiment, the concave strip and the convex strip are formed by press-molding a plate material, but the plate material may be manufactured by a processing method other than press molding.

また、凹条および凸条は電線導体の延びる方向とほぼ直交するように形成するのが良いが、必ずしも直交させる必要は無い。凹条および凸条を電線導体の延びる方向と同一方向へ形成した場合にも従来構造に比して充分な効果を得ることができる。 Moreover, although it is good to form a concave strip and a convex strip so that it may be substantially orthogonal to the direction where an electric wire conductor is extended, it is not necessary to make it orthogonal. Even when the concave stripe and the convex stripe are formed in the same direction as the direction in which the electric wire conductor extends, a sufficient effect can be obtained as compared with the conventional structure.

本実施形態では圧着面の全面に凹条および凸条を形成したが、必要部に局所的に形成するようにしても良く、また凹条および凸条の形成数も特に限定されるものではない。圧着対象となる電線は本実施形態のような撚線である必要は無く、単線でも良い。 In the present embodiment, the concave and convex ridges are formed on the entire surface of the pressure-bonding surface. However, the concave and convex ridges may be locally formed on the necessary portion, and the number of the concave and convex ridges is not particularly limited. . The electric wire to be crimped does not have to be a stranded wire as in this embodiment, and may be a single wire.

１…圧着端子、２…導体圧着部、２ａ‥圧着面、２３‥凸条、２３１‥先端、２４…凹条、４１…被覆、４２‥電線導体。 DESCRIPTION OF SYMBOLS 1 ... Crimp terminal, 2 ... Conductor crimping part, 2a ... Crimp surface, 23 ... Convex strip, 231 ... Tip, 24 ... Concave strip, 41 ... Cover, 42 ... Wire conductor.

Claims

被覆を除去した電線導体の外周に圧着固定される導体圧着部を備える圧着端子であって、圧着時に前記電線導体に接触する前記導体圧着部の圧着面の少なくとも一部に一方向へ延びる凹条を平行に複数形成し、前記凹条およびこれらの間に生じる凸条の断面形状を、実質的に三角断面としたことを特徴とする圧着端子。 A crimp terminal having a conductor crimping portion that is crimped and fixed to the outer periphery of the electric wire conductor from which the coating has been removed, and extending in one direction on at least a part of the crimp surface of the conductor crimping portion that contacts the electric wire conductor during crimping A crimp terminal having a triangular cross section substantially formed in a cross section of the concave strip and the convex strip formed between them.

前記凹条を、前記電線導体が延びる方向と交差する方向へ形成した請求項１に記載の圧着端子。 The crimp terminal according to claim 1, wherein the concave line is formed in a direction intersecting a direction in which the electric wire conductor extends.

前記凹条および前記凸条の断面形状を実質的に二等辺三角断面とした請求項１又は２に記載の圧着端子。 The crimp terminal according to claim 1 or 2, wherein a cross-sectional shape of the concave stripe and the convex stripe is substantially an isosceles triangular cross section.

請求項１ないし３に記載の圧着端子の製造方法であって、型面に前記一方向へ延びる三角断面の凸条を隣接させて平行に複数形成したプレス金型によって端子板材の板面を塑性変形させることを特徴とする圧着端子の製造方法。 4. The method of manufacturing a crimp terminal according to claim 1, wherein the plate surface of the terminal plate material is plasticized by a press mold in which a plurality of parallel protrusions having a triangular cross section extending in one direction are adjacent to the mold surface. A method of manufacturing a crimp terminal, wherein the crimp terminal is deformed.