JP2013143284A - Terminal and wire with terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance connection reliability of a wire and a terminal.SOLUTION: A terminal 20 includes a conductor 12 and a wire connection 21 which is connected with the exposed conductor 12 exposed at an end of a wire 11 having an insulating coating 13 covering the conductor 12. The wire connection 21 includes a mounting part 22 on which the exposed conductor 12 is mounted, a pair of plate members 24 projecting from both side edges of the mounting part 22 and having a thread 25 formed therein, a nut 30 into which the thread 25 of the pair of plate members 24 is screwed, and a pressed member 26 being pressed by the exposed conductor 12 mounted on the mounting part 22 when the thread 25 is screwed into the nut 30.

Description

  The present invention relates to a terminal and an electric wire with a terminal.

  As an electric wire with a terminal provided with an electric wire from which the conductor is exposed at the terminal and a terminal connected to the terminal of the electric wire while covering the conductor with an insulating coating, for example, the one described in Patent Document 1 is known. ing.

  In the electric wire with a terminal described in Patent Document 1, a wire barrel of a terminal is crimped and electrically connected to a conductor exposed at the end of the electric wire.

Japanese Utility Model Publication No. 5-72053

  In the electric wire with terminal as described above, due to the effects of creep phenomenon, vibration, etc., the barrel crimped to the electric wire returns to the state before crimping, and the contact load between the barrel and the exposed conductor of the electric wire decreases, so that the connection state May deteriorate and the connection resistance may increase.

  This invention is completed based on the above situations, Comprising: It aims at improving the connection reliability of an electric wire and a terminal.

  In order to solve the above problems, the present invention is a terminal having a wire connecting portion connected to a conductor and an exposed conductor exposed at an end of an electric wire having an insulating coating covering the conductor, and the wire connecting portion is A mounting portion on which the exposed conductor is mounted, a pair of plate members protruding from both side edges of the mounting portion and having a screw portion formed thereon, and a nut screwed into the screw portions of the pair of plate members And a pressing member pressed against the exposed conductor placed on the mounting portion by screwing the nut onto the screw portion.

  Further, the present invention is an electric wire with a terminal comprising: a conductor and an electric wire having an insulating coating covering the conductor; and a terminal having a wire connecting portion connected to an exposed conductor exposed at an end of the electric wire. The wire connection portion of the terminal includes a placement portion on which the exposed conductor is placed, a pair of plate members that protrude from both side edges of the placement portion, and are formed with screw portions, and the pair of pairs. A terminal-attached electric wire comprising: a nut screwed into a screw portion of a plate member; and a pressing member pressed against the exposed conductor placed on the mounting portion by screwing the nut into the screw portion. is there.

  In the present invention, when connecting an electric wire to the terminal, a pair of plate members that place the end of the electric wire (exposed conductor) on the placement portion of the wire connection portion of the terminal and project from both side edges of the placement portion A nut is screwed into the threaded portion of In the present invention, the exposed conductor placed on the placement portion of the wire connection portion is sandwiched between the pair of plate members, and the nuts are screwed into the screw portions formed on the pair of plate members. Pressed against the pressed pressing member. That is, according to the present invention, the exposed conductor at the end of the electric wire is clamped and connected to the terminal by both the clamping force by the pair of plate members and the pressing force of the nut, thereby preventing a reduction in contact load. A good connection state can be maintained, and the connection reliability between the electric wire and the terminal can be improved.

The present invention may have the following configuration.
The pressing member may be formed integrally with the pair of plate members.
With such a configuration, the number of parts can be reduced, and the pair of plate members and the pressing member can be manufactured from one conductive plate material.

The screw portion may be formed by press-molding a conductive plate material.
With such a configuration, since the threaded portion can be formed when the conductive plate material is press-formed into the shape of the terminal, a process of forming the threaded portion separately becomes unnecessary.

The mounting portion may have a shape along the shape of the exposed conductor.
Of the metal wires constituting the conductor of the electric wire, the metal wire that does not contact the terminal may not be electrically connected to the terminal, but with the above configuration, the placement portion (terminal) and the exposed conductor The contact area can be increased.

A convex portion that protrudes toward the exposed conductor may be formed on the placement portion.
When the metal oxide film is formed on the surface of the metal wire constituting the exposed conductor, there is a problem that the contact resistance increases even if the metal wire is in contact with the terminal. However, with the configuration as described above, the contact between the convex portion of the mounting portion and the exposed conductor promotes the destruction of the metal oxide film formed on the surface of the metal wire constituting the exposed conductor, so the contact resistance is reduced. An increase can be prevented.

A pressing protrusion that protrudes toward the exposed conductor may be formed on the pressing member.
With such a configuration, the portion of the exposed conductor that contacts the pressing protrusion is compressed so that the cross-sectional area is smaller than the other portions, and the metal that constitutes the exposed conductor by contact with the pressing protrusion The destruction of the metal oxide film formed on the surface of the strand is promoted.

The conductor may be made of aluminum or aluminum alloy.
An electric wire provided with a conductor made of aluminum or an aluminum alloy has a large difference in coefficient of thermal expansion from the terminal, so that there is a problem that it is easily affected by a creep phenomenon and a connection state is easily deteriorated. There is a problem in that a hard aluminum oxide film is easily formed on the surface of the wire and the contact resistance increases. Therefore, in the electric wire provided with a conductor made of aluminum or an aluminum alloy, the contact load between the pressing member and the exposed conductor can be prevented from decreasing, and the contact between the pressing member and the metal element wire can prevent the strands of the strands from being exposed. Since the destruction of the metal oxide film formed on the surface is promoted, the connection reliability with the terminal can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the connection reliability of an electric wire and a terminal can be improved.

The perspective view of the electric wire with a terminal of Embodiment 1 Partial sectional view in the longitudinal direction of the electric wire with terminal Sectional drawing in the AA line of FIG. Terminal perspective view Perspective view of the terminal with the nut removed FIG. 5 is a plan view of the terminal in the state of FIG. Side view of the terminal in the state of FIG. Terminal development Perspective view of terminals with wires arranged 9 is a partial cross-sectional view in the longitudinal direction of the terminal in the state of FIG. Sectional drawing in the BB line of FIG. Side view of the terminal in the state of FIG. The perspective view of the electric wire with a terminal of Embodiment 2 The perspective view of the electric wire with a terminal explained in other embodiments

<Embodiment 1>
A terminal-equipped electric wire 10 including the terminal 20 according to the first embodiment will be described with reference to FIGS. As illustrated in FIG. 1, the electric wire with terminal 10 according to the first embodiment includes a terminal 20 having an electric wire connection portion 21 to which two electric wires 11 and an exposed conductor 12 (exposed conductor 12) at the end of each electric wire 11 are connected. It consists of. In the following description, the vertical direction will be described with reference to FIG. 2, and the front-back direction will be described with the left side of FIG. 2 as the front and the right side as the rear.

  Each electric wire 11 is covered with an insulating coating 13 made of synthetic resin around the conductor 12. At the end of each electric wire 11, as shown in FIG. 1, the insulation coating 13 is stripped and the conductor 12 is exposed (exposed conductor 12). The conductor 12 is made of a stranded wire in which a large number (plural) of metal strands 14 are twisted together. The metal strand 14 (also referred to as the strand 14) is made of aluminum or aluminum alloy.

  In the following description, when distinguishing the two electric wires 11 connected to the terminal 20 of the present embodiment, the left (front) electric wire 11 shown in FIG. 1 and FIG. The second (11) electric wire 11 is defined as the second electric wire 11B.

  As shown in FIG. 2, the exposed conductor 12 exposed at the end of the first electric wire 11 </ b> A is placed in contact with the upper surface of the placement portion 22 of the terminal 20. The exposed conductor 12 exposed at the end of the second electric wire 11B is placed so as to overlap the exposed conductor 12 of the first electric wire 11B and is in contact with the lower surface of the pressing member 26.

  The terminal 20 of this embodiment has the electric wire connection part 21 to which the exposed conductor 12 of the two electric wires 11 is connected, as shown in FIG. Examples of the material of the terminal 20 include conductive plate materials such as copper, copper alloy, aluminum, and aluminum alloy, and an appropriate metal material is selected as necessary. In the present embodiment, the terminal 20 is made of copper or a copper alloy.

  A plating layer may be formed on the surface of the metal material constituting the terminal 20. Examples of the metal constituting the plating layer include tin, nickel, and the like, and are appropriately selected from arbitrary metal materials as necessary.

  Now, the wire connection part 21 of the terminal 20 of the present embodiment includes a placement part 22 on which the exposed conductor 12 exposed at the end of the wire 11 is placed, and a pair of protrusions protruding upward from both side edges of the placement part 22. The plate member 24, a nut 30 that is screwed into the screw portion 25 of the pair of plate members 24, and a pressing member 26 that is pushed downward by the screwing of the nut 30.

  As shown in FIGS. 3 and 7, the mounting portion 22 of the electric wire connection portion 21 has an arc shape along the shape of the exposed conductor 12 of the electric wire 11. As shown in FIGS. 4 and 5, the upper surface of the mounting portion 22 (the surface on which the exposed conductor 12 is mounted, the surface on the exposed conductor 12 side) is uneven in which convex portions 23 </ b> A and concave portions 23 </ b> B are alternately formed. It has a shape. A metal oxide film (aluminum oxide in this embodiment) formed on the surface of the strand 14 constituting the conductor 12 by the projections 23A and the recesses 23B formed on the upper surface of the mounting portion 22 contacting the exposed conductor 12 Breaking of the coating) is promoted.

  As shown in FIGS. 3 to 5, the pair of plate members 24 are formed so as to protrude from the placement portion 22. As shown in FIG. 5, a screw thread 25 (an example of a screw portion 25) having a male screw structure into which the nut 30 can be screwed is formed on the end surfaces of the pair of plate members 24.

  As shown in FIG. 4, the nut 30 is formed with a thread groove 31 that can be screwed into the screw thread 25 formed in the pair of plate members 24, and the nut 30 is screwed into the screw thread 25. 30 moves downward.

  A pressing member 26 is disposed below the nut 30. The pressing member 26 continues from the rear end portion of the right plate member 24A shown in FIG. 5 of the pair of plate members 24, and has an arc shape in a side view (see FIG. 7). In the present embodiment, the pressing member 26 is integrally formed with the mounting portion 22 and the pair of plate members 24 as shown in FIG.

  As shown in FIGS. 5 to 7, a pressing protrusion 27 that protrudes downward (on the exposed conductor 12 side) is provided at the approximate center of the pressing member 26. The portion of the exposed conductor 12 that contacts the pressing protrusion 27 is compressed by the pressing protrusion 27 so that the cross-sectional area is smaller than the other portions. Further, when the pressing protrusion 27 comes into contact with the exposed conductor 12, the destruction of the metal oxide film formed on the surface of the strand 14 constituting the conductor 12 is promoted.

Next, the manufacturing method of the terminal 20 of this embodiment is demonstrated.
Using a copper or copper alloy plate material (an example of a conductive plate material), a developed terminal plate material 20A as shown in FIG. 8 is press-molded. At this time, the screw portion 25 is formed on the end surface of the portion corresponding to the pair of plate members 24. By bending the terminal plate material 20A, the terminal 20 having a shape as shown in FIGS. 5 to 7 including the placement portion 22, the pair of plate members 24, and the pressing member 26 is obtained. When the nut 30 is screwed into the thread 25 of the pair of plate members 24 of the terminal 20, the terminal 20 of the present embodiment shown in FIG. 4 is obtained.

  Next, the electric wire 11 is connected to the terminal 20 of this embodiment. A terminal 20 shown in FIG. 4 and two electric wires 11 are prepared. The insulation coating 13 at the end of each electric wire 11 is peeled and removed to expose the core wire 12.

  Next, the exposed conductor 12 of the first electric wire 11 </ b> A and the exposed conductor 12 of the second electric wire 11 </ b> B are placed on the terminal 20. At this time, the nut 30 is loosely attached to the pair of plate members 24 so that the exposed conductors 12 of the two electric wires 11 can be smoothly inserted between the placement portion 22 of the terminal 20 and the pressing member 26. Keep it.

  When the exposed conductor 12 of the first electric wire 11A is inserted from the front end (left end in FIG. 10) of the electric wire connection portion 21 and placed on the placement portion 22, the conductor 12 is arranged along the placement portion 22 and mounted. The convex portion 23A of the placement portion 22 and the element wire 14 constituting the exposed conductor 12 come into contact with each other, thereby destroying the metal oxide film formed on the surface of the element wire 14 and forming a new metal surface.

  Next, the exposed conductor 12 of the second electric wire 11B is inserted from the rear end (right end in FIG. 10) of the electric wire connection portion 21 and placed on the placement portion 22 together with the second electric wire 11B (see FIGS. 9 and 10). ). Here, in the state shown in FIGS. 9 to 12, the exposed conductor 12 is sandwiched from both sides by the pair of plate members 24, but the pressing force by the pressing member 26 is not applied (particularly FIGS. 10 and 10). 11).

  When the nut 30 is further moved downward from the state shown in FIG. 9, the pressing member 26 that is in contact with the lower end portion of the nut 30 is pressed downward, and the pressing protrusion 27 constitutes the exposed conductor 12. 14, the metal oxide film formed on the surface of the strand 14 is broken and a new metal surface is formed. Further, the exposed conductor 12 is pressed by the pressing member 26 while being sandwiched between the pair of plate members 24 by screwing the nut 30 downward. Then, in the exposed conductor 12, the portion where the pressing protrusion 27 of the pressing member 26 contacts is compressed so that the cross-sectional area becomes smaller than other portions (see FIG. 2). When the screwing of the nut 30 is completed, the terminal-attached electric wire 10 shown in FIGS. 1 to 3 is obtained.

Next, the operation and effect of this embodiment will be described.
According to this embodiment, the exposed conductor 12 exposed at the end of the electric wire 11 is clamped and connected to the terminal 20 by both the clamping force by the pair of plate members 24 and the pressing force of the nut 30, so that the contact load It is possible to maintain a good connection state and to improve the connection reliability between the electric wire 11 and the terminal 20.

  In addition, according to the present embodiment, the pressing member 26 is formed integrally with the pair of plate members 24, so that the number of parts can be reduced, and the pair of plate members 24 and the pressing member 26 are electrically connected to each other. It can produce from a property board material.

  Further, according to the present embodiment, since the screw thread 25 (screw portion 25) is formed by press-molding the conductive plate material, the screw portion 25 is formed when the conductive plate material is press-formed into the shape of the terminal 20. Therefore, the process of forming the screw part 25 separately becomes unnecessary.

  Moreover, according to this embodiment, since the mounting part 22 has a shape along the shape of the exposed conductor 12, the contact area between the mounting part 22 (terminal 20) and the exposed conductor 12 can be increased. The connection state can be made favorable.

  Further, according to the present embodiment, since the mounting portion 22 is formed with the convex portion 23 </ b> A protruding toward the exposed conductor 12, it is exposed by the contact between the convex portion 23 </ b> A of the mounting portion 22 and the exposed conductor 12. Since the destruction of the metal oxide film formed on the surface of the metal wire 14 constituting the conductor 12 is promoted, an increase in contact resistance can be prevented.

  Furthermore, according to the present embodiment, the pressing member 26 is formed with the pressing protrusion 27 that protrudes toward the exposed conductor 12, so that the portion of the exposed conductor 12 that contacts the pressing protrusion 27 has a cross-sectional area. Is compressed so as to be smaller than other portions, and the destruction of the metal oxide film formed on the surface of the metal wire 14 constituting the exposed conductor 12 by the contact with the pressing protrusion 27 is promoted.

  Further, according to the present embodiment, since the conductor 12 is made of aluminum or aluminum alloy, in the electric wire 11 including the conductor 12 made of aluminum or aluminum alloy, the contact load between the pressing member 26 and the exposed conductor 12 is reduced. Since the destruction of the metal oxide film formed on the surface of the element wire 14 is promoted by the contact between the pressing member 26 and the metal element wire 14, the connection reliability with the terminal 20 can be improved. .

<Embodiment 2>
The electric wire 40 with a terminal provided with the terminal 41 of Embodiment 2 is demonstrated with FIG. The electric wire with terminal 40 of this embodiment is different from that of the first embodiment in that the shape of the terminal 41 and the number of the electric wires 11 connected to the electric wire connecting portion 42 are one. The same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The electric wire 11 is covered with a synthetic resin insulating coating 13 around the conductor 12, and at the end thereof, as shown in FIG. 13, the insulating coating 13 is stripped and the conductor 12 is exposed (exposed conductor 12). ).

  The terminal 41 includes an electric wire connecting portion 42 to which the exposed conductor 12 of the electric wire 11 is connected, and a flat terminal connecting portion 47 connected from the electric wire connecting portion 42 to a counterpart terminal (not shown). . A terminal connection hole 47 </ b> A for connecting a mating terminal is provided in a substantially central portion of the terminal connection portion 47.

  As in the first embodiment, the electric wire connecting portion 42 includes a placement portion 43 on which the electric wire 11 is placed, a pair of plate members 44 protruding from both side edges of the placement portion 43, a pressing member 46, and a pair of plate members. A nut 30 is provided to be screwed into a screw part 45 (thread 45) formed in 44. Other configurations are generally the same as those of the first embodiment. According to this embodiment, the same effect as that of the first embodiment can be obtained.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the first embodiment, an example in which one electric wire 11 is connected to each of the front and rear of the electric wire connecting portion 21 of the terminal 20 has been shown. For example, as shown in FIG. You may connect only to one (front) of the electric wire connection part 21 of. Moreover, three or more electric wires may be inserted into the electric wire connecting portion.
In the electric wire 50 with a terminal shown in FIG. 14, the configurations of the terminal 20 and the electric wire 11 are the same as those in the first embodiment, and the same reference numerals are given to the same configurations as those in the first embodiment.
(2) In the second embodiment, the example in which one electric wire 11 is connected to the terminal 41 having the terminal connecting portion 47 connected to the counterpart terminal is shown. However, two or more terminals are configured in the configuration as in the second embodiment. May be connected.
(3) Although the pressing member 26 has shown the terminal 20 integrally formed with a pair of plate member 24 in the said embodiment, a pressing member may be a different body from a pair of plate member.
(4) In the above embodiment, the pair of plate members 24 including the screw portions 25 formed by press-molding the conductive plate material is shown. However, after the conductive plate material is pressed into a predetermined shape, the pair of plate members You may form a screw part in.
(5) In the above embodiment, the terminal 20 including the mounting portion 22 that has an arc shape along the shape of the exposed conductor 12 is shown. However, even if the terminal 20 includes a mounting portion that does not conform to the shape of the exposed conductor. Good.
(6) In the above embodiment, the terminal 20 including the mounting portion 22 formed with the convex portion 23A protruding to the exposed conductor 12 side is shown. However, even if the convex portion is not formed on the mounting portion. Good.
(7) In the above embodiment, the pressing member 26 having the pressing protrusion 27 protruding toward the exposed conductor 12 is shown, but the pressing protrusion 26 may not be formed.
(8) In the said embodiment, although the electric wire 11 provided with the conductor 12 which consists of the strand 12 which twisted the strand 14 made from aluminum or aluminum alloy was shown, the conductor provided with the strand made from copper or a copper alloy is shown. It may be an electric wire.
(9) In the above embodiment, the terminal 20 made of copper or copper alloy is shown, but it may be a terminal made of aluminum or aluminum alloy.

DESCRIPTION OF SYMBOLS 10, 40, 50 ... Electric wire with a terminal 11 ... Electric wire 11A ... 1st electric wire 11B ... 2nd electric wire 12 ... Conductor (exposed conductor)
DESCRIPTION OF SYMBOLS 13 ... Insulation coating 20, 41 ... Terminal 21, 42 ... Electric wire connection part 22, 43 ... Mounting part 23A ... Convex part 24, 44 ... A pair of board member 25, 45 ... Screw thread (screw part)
26,46 ... Pressing member 27 ... Pressing protrusion 30 ... Nut 31 ... Thread groove

Claims (13)

A terminal having a wire connecting portion connected to an exposed conductor exposed at a terminal of a conductor and an electric wire having an insulating coating covering the conductor,
The wire connecting portion is a placement portion on which the exposed conductor is placed;
A pair of plate members protruding from both side edges of the mounting portion and having screw portions formed thereon, and nuts screwed into the screw portions of the pair of plate members;
And a pressing member pressed against the exposed conductor placed on the mounting portion by screwing the nut onto the screw portion. The terminal according to claim 1, wherein the pressing member is formed integrally with the pair of plate members. The terminal according to claim 1, wherein the screw portion is formed by press-molding a conductive plate material. The terminal according to any one of claims 1 to 3, wherein the placement portion has a shape along the shape of the exposed conductor. The terminal according to any one of claims 1 to 4, wherein the placement portion is formed with a protrusion protruding toward the exposed conductor. The terminal according to any one of claims 1 to 5, wherein a pressing protrusion that protrudes toward the exposed conductor is formed on the pressing member. An electric wire with a terminal, comprising: a conductor and an electric wire having an insulating coating covering the conductor; and a terminal having an electric wire connecting portion connected to an exposed conductor exposed at an end of the electric wire,
The wire connection portion of the terminal includes a placement portion on which the exposed conductor is placed;
A pair of plate members protruding from both side edges of the mounting portion and having screw portions formed thereon, and nuts screwed into the screw portions of the pair of plate members;
An electric wire with a terminal, comprising: a pressing member that is pressed against the exposed conductor placed on the placement portion by screwing the nut onto the screw portion. The electric wire with a terminal according to claim 7, wherein the pressing member is formed integrally with the pair of plate members. The electric wire with a terminal according to claim 7 or 8, wherein the screw portion is formed by press-molding a conductive plate material. The terminal-attached electric wire according to any one of claims 7 to 9, wherein the placement portion has a shape along the shape of the exposed conductor. The electric wire with a terminal according to any one of claims 7 to 10, wherein a convex portion protruding toward the exposed conductor is formed on the placement portion. The electric wire with a terminal according to any one of claims 7 to 11, wherein a pressing protrusion that protrudes toward the exposed conductor is formed on the pressing member. The electric wire with a terminal according to any one of claims 7 to 12, wherein the conductor is made of aluminum or an aluminum alloy.

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