JP5376639B2 - Crimp terminal structure and harness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To crimp the electric wire without deteriorating mechanical strength and durability. <P>SOLUTION: The crimp style terminal 10 is provided with, for example, a connecting part 11, a crimping barrel part 12, and a support barrel part 13, and an aluminum wire 20 has a structure in which a core wire 21 is covered with a coating 22. The crimping barrel part 12 consists of a pair of pinching members 16, 16 and the thickness L2 near the top end parts 16a, 16a is formed thinner than the thickness L1 of the pinching members 16, 16. Upon crimping, the edge portion near the top end parts 16a, 16a shaves off the oxidized coating of the core wire 21 and the top end parts 16a, 16a eat into the core wire, thereby, conduction is certainly secured, and deterioration of mechanical strength and durability can be prevented. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a terminal structure and a harness of a crimp terminal that is crimp-connected to an electric wire having a core wire made of a conductive material.

  2. Description of the Related Art Conventionally, aluminum wire crimp terminals (see, for example, Patent Document 1 (page 3-4, FIG. 1-3)) are known to be crimped and connected to electric wires. This crimp terminal for an aluminum electric wire includes a crimp part connected by crimping to a conductor of the aluminum electric wire. A crimping | compression-bonding part has a crimping piece on the right and left of the base which receives the aluminum conductor which exposed the terminal part of the aluminum electric wire.

  Further, a serration extending obliquely with respect to the length direction of the conductor is formed on the inner surface of the crimping portion that contacts the conductor. At the time of crimping, the serration is crimped to the surface of the aluminum conductor in a spiral manner, and the oxide film on the surface of the conductor is destroyed to make contact conduction.

JP 2003-249284 A

  However, in the crimp terminal for an aluminum electric wire disclosed in Patent Document 1 described above, a structure in which the conductor of the aluminum electric wire is twisted and stretched to be firmly connected is realized. For this reason, the tensile strength in the length direction of the conductor after crimping is weak, and there is a problem that the overall mechanical strength is inferior.

  In addition, even if a coating crimping part (insulation barrel) that holds the coating part of the aluminum electric wire is further provided, when the crimping part (conductor crimping part) with the above-described conductor is simultaneously crimped together with this coating crimping part, There is a problem in that the stress due to the action of the conductor extending between these crimped portions remains and the mechanical durability is poor.

  An object of the present invention is to provide a terminal structure of a crimp terminal and a harness that can be crimped to an electric wire without deteriorating mechanical strength and durability in order to eliminate the above-described problems caused by the prior art.

  In order to solve the above-described problems and achieve the object, a terminal structure of a crimp terminal according to the present invention is a terminal structure of a crimp terminal to be crimped and connected to an electric wire having a core wire made of a conductive material, The terminal has at least a crimping barrel portion including a pair of clamping pieces that are crimped to the core wire by being bent inward in the opposite direction, and an end portion of the crimping barrel portion that is crimped to the core wire is formed of the core wire. It is characterized in that it is formed in a thin shape that is thinner than other parts over the entire axial direction.

  At least one stepped shape extending along the axial direction of the core wire, for example, is formed inside the thinned portion of the crimp barrel portion.

  Moreover, the said crimping | compression-bonding barrel part is formed by press work, for example.

  The conductive material constituting the core wire is, for example, aluminum or an aluminum alloy.

  The crimp terminal further includes, for example, a connection portion connected to the connection partner connection terminal, and a holding barrel portion that crimps and holds the electric wire together with the coating.

  The harness according to the present invention is characterized in that a plurality of electric wires each having a crimp terminal having a crimp terminal structure according to the invention are bundled.

  The plurality of electric wires are used, for example, for automobile wiring.

  ADVANTAGE OF THE INVENTION According to this invention, the terminal structure and harness of a crimp terminal which can be crimped | bonded to an electric wire, without reducing mechanical strength and durability can be provided.

It is a side view for demonstrating the example of the crimp terminal and electric wire to which the terminal structure of the crimp terminal concerning one Embodiment of this invention is applied. It is a figure which shows the A-A 'cross section of FIG. 1 before and behind crimping | compression-bonding in the same crimp terminal. It is a figure which shows the cross section before and behind crimping of the other example of the crimp terminal to which the terminal structure of the crimp terminal concerning one Embodiment of this invention is applied. It is a partially expanded sectional view which shows the further another example of the crimp terminal to which the terminal structure of the crimp terminal concerning one Embodiment of this invention is applied. It is explanatory drawing which shows the harness concerning one Embodiment of this invention. It is explanatory drawing which shows the example which applied the harness to the motor vehicle.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a terminal structure of a crimp terminal and a harness according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a side view for explaining an example of a crimp terminal and an electric wire to which a terminal structure of a crimp terminal according to an embodiment of the present invention is applied, and FIG. 2 is a cross-sectional view of FIG. It is a figure which shows A 'cross section. FIG. 3 is a diagram showing a cross section of another example of a crimp terminal to which the terminal structure of the crimp terminal according to the embodiment of the present invention is applied, and FIG. 4 is a diagram of the crimp according to the embodiment of the present invention. It is a partially expanded sectional view which shows the further another example of the crimp terminal to which the terminal structure of a terminal is applied.

  FIG. 5 is an explanatory view showing a harness according to an embodiment of the present invention, and FIG. 6 is an explanatory view showing an example in which the harness is applied to an automobile. As shown in FIG. 1, the crimp terminal 10 having the terminal structure according to the present embodiment includes, for example, punching (pressing) / bending (bending) a metal (iron, copper, copper alloy, etc.) base material, respectively. It has at least a crimping barrel portion 12 including a pair of sandwiching pieces 16 and 16 described later, which are crimped to the core wire 21 by being bent inward in the facing direction.

  Further, the crimp terminal 10 has a connection part 11 fitted and connected to a connection counterpart connection terminal (not shown) on the distal end side, the crimp barrel part 12 on the proximal side of the connection part 11, and A holding barrel portion 13 is provided on the proximal end side to hold an aluminum electric wire (hereinafter referred to as “aluminum electric wire”) 20 together with a coating 22 and press-fit.

  The aluminum electric wire 20 has a structure in which the core wire 21 is made of a conductor (conductive material) such as aluminum or an aluminum alloy, and the core wire 21 is covered with a coating 22 made of an insulating material. The aluminum electric wire 20 may be, for example, one in which a core wire 21 made of a single-wire aluminum conductor is covered with a coating 22, or one in which a core wire 21 made of a stranded wire formed by twisting a plurality of aluminum conductors is covered with a coating 22. But you can.

  Here, the locking piece 14 or the locking hole 15 formed in the connection portion 11 of the crimp terminal 10 is, for example, a recess formed in the terminal receiving hole of the connector 31 (see FIG. 6) into which the crimp terminal 10 is inserted. It is used for engaging with the convex portion and positioning and mounting / fixing the crimp terminal 10 in the terminal accommodating hole, and is appropriately formed as necessary.

  The crimping barrel portion 12 of the crimping terminal 10 is composed of a pair of sandwiching pieces 16 and 16 (see, for example, FIG. 1) that are erected in parallel when not crimped, and a core wire between the sandwiching pieces 16 and 16. After placing 21, each of them is crimped to the core wire 21 by bending them inward in the opposite direction.

  The distal end portions 16a and 16a of the crimping barrel portion 12 are thinner than the other portions of the pair of sandwiching pieces 16 and 16 over the entire axial direction of the core wire 21, that is, over the distal end portions 16a and 16a. It is formed to be thin. That is, as shown in FIG. 2A, when the normal thickness of the pair of sandwiching pieces 16 and 16 is L1, the thickness L2 in the vicinity of the tip portions 16a and 16a is formed to be thinner than L1. .

  Here, the opposing inner surfaces in the vicinity of the tip portions 16a and 16a of the pair of sandwich pieces 16 and 16 are formed in a tapered manner obliquely over the tip portions 16a and 16a, so that the sandwich pieces 16 and 16 as described above are formed. Thickness L1> thickness L2. In addition, it is preferable to make the front end surfaces of the front end portions 16a and 16a flat in consideration of safety in handling.

  When the crimping terminal 10 configured in this manner is crimped to the aluminum electric wire 20, the pair of sandwiching pieces 16 and 16 of the crimping barrel portion 12 are bent inward in the opposing direction, as shown in FIG. Then, by being deformed into an M-shaped cross section, the tip ends 16a and 16a are crimped to the core wire 21 of the aluminum electric wire 20 in a crimped state.

  Specifically, in the tip portions 16a and 16a of the pair of sandwiching pieces 16 and 16 of the crimping barrel portion 12, an edge portion on the inner side in the opposing direction of the tip portions 16a and 16a is formed on the surface of the core wire 21 during crimping. After cutting off the strong oxide film, the core wire 21 is cut into the core wire 21 and strongly pressed to ensure conduction. At the same time, the pair of sandwiching pieces 16 and 16 are deformed and pressure-bonded in a state of including the core wire 21. At the same time, the aluminum wire 20 is crimped and fixed to the crimp terminal 10 by the holding barrel portion 13 together with the covering 22.

  Therefore, according to the crimp terminal 10 of the present example, the length of the core wire 21 in the lengthwise direction is not increased more than necessary as in the conventional case, and the aluminum electric wire 20 can be reliably connected without reducing mechanical strength and durability. In addition, it can be firmly bonded. In addition, since the jig | tool etc. which crush the crimping | compression-bonding barrel part 12 can use a conventional thing as it is, a special jig | tool etc. are unnecessary separately, and the conduction | electrical_connection of the crimp terminal 10 to the core wire 21 of the aluminum electric wire 20 was ensured. It can be reliably crimped in the state.

  Moreover, the crimp barrel part 12 of the crimp terminal 10 can also be comprised as follows. That is, as shown in FIG. 3 (a), the crimp barrel portion 12 here has a thickness L2 of the tip portions 16a, 16a on the inner surfaces in the opposing direction of the pair of sandwiching pieces 16, 16, as described above. Step portions 16b, 16b extending along the axial direction of the core wire 21 for thinning are formed.

  With the stepped portions 16b and 16b as a boundary, the thickness of the sandwiching pieces 16 and 16 is formed such that L1> L2. Therefore, when the aluminum wire 20 is crimped, the pair of sandwiching pieces 16 and 16 of the crimping barrel portion 12 are bent inward in the opposite direction as shown in FIG. By being deformed, the tip end portions 16a and 16a are crimped to the core wire 21 of the aluminum electric wire 20.

  And in the front-end | tip parts 16a and 16a of a pair of clamping pieces 16 and 16 of the crimping | compression-bonding barrel part 12, the edge part inside the opposing direction of front-end | tip parts 16a and 16a and the edge part of step part 16b, 16b are core wires in the case of crimping | compression-bonding. The oxide film on the surface of 21 is scraped off and crimped in a state of biting into the core wire 21 to ensure conduction. Thereby, it can be reliably and firmly crimped to the core wire 21 of the aluminum electric wire 20 without similarly reducing the mechanical strength and durability.

  Further, as shown in FIG. 4, a plurality of step portions 16b1 and 16b2 are formed on the inner surfaces in the opposing direction of the pair of sandwiching pieces 16 and 16 of the crimping barrel portion 12, and the thickness L2 of the tip portions 16a and 16a is reduced. You may make it do. In this case, assuming that the thickness of the sandwiching piece 16 is L1a, the thickness on the tip 16a side beyond the step 16b1 is L1b, and the thickness of the tip 16a beyond the step 16b2 is L2, the thickness is L1a> It is good to form so that thickness may become thin gradually toward the front-end | tip part 16a so that it may become L1b> L2.

  Even if the crimping barrel portion 12 is configured in this manner, the edge portion on the inner side in the opposing direction of the tip portions 16a, 16a, the edge portions of the step portions 16b2, 16b2, and the edge portions of the step portions 16b1, 16b1 The oxide film can be scraped off. Therefore, it can be securely and firmly crimped to the core wire 21 of the aluminum electric wire 20 without lowering the mechanical strength and durability.

  In addition, as shown in FIG. 5, the aluminum electric wire 20 which crimped | bonded the crimp terminal 10 in this way can be used as the harness 30 in the state (bundled state) which set the multiple pieces, for example, In this case, each crimp terminal 10 is normally housed and used in a terminal housing hole 32 such as the connector 31.

  As shown in FIG. 6, the harness 30 to which the connector 31 is attached is used for wiring of the seat connector 49 of the seat 40 mounted on the vehicle 1. For example, if the connector 31 of the harness 30 and the sheet connector 49 are connected, electrical wiring from the sheet 40 by each aluminum electric wire 20 of the harness 30 becomes possible, and the crimp terminal 10 having high crimping reliability with the core wire 21 can be obtained. The electrical connection used can be made possible.

DESCRIPTION OF SYMBOLS 1 Vehicle 10 Crimp terminal 11 Connection part 12 Crimp barrel part 13 Holding barrel part 14 Locking piece 15 Locking hole 16 Clamping piece 16a Tip part 16b Step part 20 Aluminum electric wire 21 Core wire 22 Covering 30 Harness 31 Connector 40 Sheet 49 Sheet side connector

Claims (6)

A terminal structure of a crimp terminal to be crimped and connected to an electric wire having a core wire made of a conductive material,
The crimp terminal has at least a crimp barrel portion formed by press working including a pair of clamping pieces that are crimped to the core wire by being bent inward in the opposing direction,
The end of the crimp barrel that is crimped to the core wire extends along the axial direction across the entire axial direction of the core wire and falls along the thickness direction from the inner side to the outer side in the opposite direction. A terminal structure of a crimp terminal, characterized in that it is formed thinner than other parts with the stepped part formed as a boundary . The terminal structure of the crimp terminal according to claim 1 , wherein a plurality of the stepped portions are formed toward a distal end portion of the clamping piece . The terminal structure of the crimp terminal according to claim 1 or 2, wherein the conductive material constituting the core wire is aluminum or an aluminum alloy. The crimp terminal is connected to the connection portion to be connected to the mating connection terminal, crimping of any one of claims 1-3, characterized in that it further comprises a holding barrel portion for crimping held together cover the electric wire Terminal structure of the terminal. The harness characterized by bundling the some electric wire by which the crimp terminal provided with the terminal structure of the crimp terminal of any one of Claims 1-4 was crimped | compressed, respectively. The harness according to claim 5 , wherein the plurality of electric wires are used for wiring of an automobile.

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