JP6368071B2 - Wire connection structure - Google Patents

Description

  The present invention relates to a wire connection structure.

  Conventionally, as a wire connection structure for connecting an electric wire and a terminal, a needle contact attached to the surface of the terminal is inserted from the end surface of the electric wire along the longitudinal direction of the electric wire, and this contact enters the conductor portion of the electric wire. By doing so, an electric wire connection structure for connecting an electric wire and a terminal via a contact is known.

  As this type of electric wire connection structure, for example, a structure is known in which a cylindrical member having an insertion hole for an electric wire is attached to an end face of a terminal, and a needle-like contact is provided behind the insertion hole for the electric wire (patent) Reference 1). This cylindrical member forms a plurality of protrusions on the inner peripheral surface on the inlet side of the insertion hole of the electric wire, deforms the inner peripheral surface of the insertion hole, and presses the protrusion against the outer peripheral surface of the electric wire, thereby It is preventing it from coming off.

  In addition, a needle-like contact is provided in the back of the insertion hole of the electric wire of the connector housing, and the locking piece is slid toward the outer peripheral surface of the electric wire inserted into the insertion hole, and is formed on the locking piece. A structure is known in which the protruding portion is pressed against the outer peripheral surface of the electric wire to prevent the electric wire from coming off (see Patent Document 2).

  According to the techniques of Patent Documents 1 and 2, the electric wire can be connected to the terminal by a simple operation without performing an operation such as stripping the wire or tightening the screw.

Japanese Patent Laid-Open No. 11-307152 JP 2010-170706 A

  However, since the electric wire connection structures of Patent Documents 1 and 2 cannot be said to have sufficient electric wire holding force simply by inserting a contact into the electric wire, a separate structure for holding the electric wire is required. For this reason, when these structures are applied to a connector or the like, the structure of the connector becomes complicated, leading to an increase in size of the connector and an increase in manufacturing cost.

  An object of the present invention is to secure a holding force of an electric wire with a simple structure in an electric wire connection structure in which a needle-like contact is inserted into a conductor of an electric wire to connect the electric wire.

To solve the above problems, the present invention provides a wire connecting structure of the needle-like contacts that will be connected to the terminal by entering the conductor inside portion from the end face of the electric wire connecting the terminal and the electric wire electrically, The terminal is provided with a joint portion having a contact surface that is substantially orthogonal to the extending direction of the terminal and abutted with the end surface of the electric wire at one end, and the contact is cantilevered by the joint portion and is separated from the contact surface. barrel Extruded straight in direction a plurality of arranged parallel to each other around a virtual axis, the protrusion protruding in a direction away from the imaginary axis is provided at the distal end portion of the body portion of each contact, the end face of the wire is a tip portion and a body portion of the contact to the conductor portion of the intrusion, the ring member mounted on the outer peripheral surface of the electric wire, crimping an outer circumferential surface of the wire opposite to the body portion excluding the front end portions of the contact It is characterized by.

According to this, the tip of the contact can be penetrated from the end face of the electric wire to the back of the conductor, and the protrusion protruding from the tip can be bitten into the conductor, so that the electric wire contacts The movement along the axial direction of the child can be suppressed, and the holding force of the electric wire by the contact can be increased. Accordingly, it is not necessary to separately provide a structure for holding the electric wire, the electric wire can be held with a predetermined holding force, and the size and cost of the structure can be reduced.

In addition, the ring member attached to the outer peripheral surface of the electric wire caulks the outer peripheral surface of the electric wire facing the body portion excluding the tip of the contact member, so that the covering portion that forms the outer peripheral surface of the electric wire Since it can push in toward the trunk | drum except for the front-end | tip part, it can control that the front-end | tip part of a contactor moves within a conductor. Therefore, the holding power of the electric wire can be remarkably increased without increasing the size of the entire structure. Furthermore, since the tip of each contact is formed so that the protrusion protrudes in a direction away from the virtual axis, an increase in the holding force of the electric wire by caulking the outer peripheral surface of the electric wire can be obtained more reliably. .

  ADVANTAGE OF THE INVENTION According to this invention, the holding | maintenance force of an electric wire is securable with a simple structure in the electric wire connection structure which inserts a needle-shaped contact into the inside of the conductor of an electric wire, and connects an electric wire.

In one Embodiment of the electric wire connection structure which concerns on this invention, it is a perspective view which shows the state in which a contactor is attached to a terminal. It is a figure explaining the operation | movement which connects an electric wire to the terminal of FIG. It is sectional drawing of the AA arrow of FIG. In other embodiment of the electric wire holding structure which concerns on this invention, it is a perspective view which shows the state in which a contactor is attached to a terminal. It is a figure explaining the operation | movement which connects an electric wire to the terminal of FIG. It is sectional drawing of the BB arrow of FIG.

  Hereinafter, an embodiment of a wire connection structure to which the present invention is applied will be described with reference to FIGS. In the present embodiment, a wire connection structure for connecting a wire to a terminal of a connector mounted on a moving body such as an automobile will be described, but the mode of the terminal to which the wire is connected is not limited to this example. .

  The electric wire connection structure of the present embodiment includes a terminal 1, a needle-like contact 2, and an electric wire 3. As shown in FIG. 1, the terminal 1 is formed by bending a metal plate material into an L shape as a whole. One end face 4 of the terminal 1 is provided with a plurality of (five in FIG. 1) through holes 5 through which the contact 2 is inserted. In FIG. 1, only the terminals and contacts are shown, and other configurations of the connector are omitted.

  Each contact 2 is formed of a conductor such as metal, and has a cylindrical body 6 and a front end 7 provided on the front end in the axial direction of the body 6 (the front end in the direction of insertion into the through hole 5). And the collar part 8 provided in the base end side of the axial direction of the trunk | drum 6 is provided. The trunk | drum 6, the front-end | tip part 7, and the collar part 8 are mutually coaxially formed. The distal end portion 7 is formed in a conical shape, and the maximum outer diameter thereof is larger than the outer diameter of the body portion 6. That is, the distal end portion 7 is formed to bulge in a direction intersecting the axial direction (a direction orthogonal in the present embodiment) and continuously reduce in diameter toward the distal end. The flange portion 8 is formed in a columnar shape, and the outer diameter thereof is larger than the outer diameter of the body portion 6 and the maximum outer diameter of the distal end portion 7. In this embodiment, an example in which the tip portion is formed in a conical shape is shown, but the shape of the tip portion is not limited to this example. What is necessary is just to have the part bulged in the direction which cross | intersects a direction.

  The contacts 2 formed in this way are inserted through the through holes 5 of the terminals 1 from the direction indicated by the arrows in FIG. The contact 2 inserted through the through hole 5 is welded or the like in a state where the flange portion 8 is in contact with the end surface of the peripheral edge of the through hole 5 and is held by the terminal 1 in a cantilever manner. The plurality of contacts 2 supported by the terminal 1 are arranged in parallel with a predetermined distance from each other.

  An electric wire 3 is connected to the terminal 1 holding the contact 2 in this way. One end of the electric wire 3 is a cut surface. The cut surface of the electric wire 3 exposes a substantially circular cross section of the conductor portion 9 formed of a bundle of a plurality of strands and a cross section of the insulating covering portion 10 surrounding the conductor portion 9 (FIG. 2). ).

  As shown in FIG. 2, when connecting the electric wire 3 to the terminal 1, the cut surface of the electric wire 3 is brought close to the pointed tip of each contact 2, and this tip is attached to the conductor portion 9 exposed from the cut surface of the electric wire 3. Make contact. Then, the electric wire 3 is pressed along the axial direction of the contact 2 until the cut surface of the electric wire 3 comes into contact with the end surface 4 of the terminal 1. As a result, each contact 2 is inserted into the conductor portion 9 of the electric wire 3, and the distal end portion 7 penetrates deeply between the plurality of strands of the conductor portion 9. Thus, the electric wire 3 is electrically connected to the terminal 1 via the plurality of contacts 2.

  In FIG. 3, the cross section of the electric wire 3 when FIG. 2 is seen from arrow AA direction is shown. As shown in FIG. 3, the distal end portions 7 and the trunk portions 6 of the plurality of contacts 2 enter the conductor portion 9 of the electric wire 3 along the longitudinal direction of the electric wire 3.

  According to the present embodiment, not only the tip 7 of the contact 2 but also the body 6 penetrates into the conductor 9, so that the tip 7 of the contact 2 extends from the end face of the electric wire 3 to the back of the conductor 9. The portion that bulges from the tip portion 7 of the contact 2 can be bitten into the conductor portion 9. Thereby, since it can suppress that the electric wire 3 moves along the axial direction of the contactor 2, the retention strength of the electric wire 3 by the contactor 2 is improved, and the contact reliability of the terminal 1 and the electric wire 3 is improved. be able to. Moreover, in this embodiment, since the trunk | drum 6 of the electric wire 3 is made to penetrate | invade into the conductor part 9 of the electric wire 3, the enlargement of the longitudinal direction of the electric wire 3 can be avoided in a connector. Since it is not necessary to provide a new structure for holding the connector, the connector can be miniaturized and the cost can be reduced.

  Here, the contact area between the contact 2 including the body 6 and the conductor 9 increases as the depth (the dimension a in FIG. 3) at which the tip 7 of the contact 2 enters the conductor 9 increases. Thus, the holding power of the electric wire 3 can be increased, but the burden of the assembling work when the contact 2 is inserted into the conductor portion 9 is increased accordingly. For this reason, it is desirable to appropriately set the dimension a of the contact 2 in consideration of, for example, the balance between the holding force of the electric wire 3 and the workability during the assembly work.

  Further, in the present embodiment, as a structure for holding the contact 2 on the terminal 1, a structure is employed in which the flange 8 of the contact 2 is welded in a state where it is in contact with the peripheral edge of the through hole 5 of the terminal 1. However, the present invention is not limited to this. For example, the contact 2 may be press-fitted and held in the through hole 5 of the terminal 1. According to this, since the dimension b in FIG. 3 can shorten the length corresponding to the thickness of the flange part 8, the dimension of the connector in the longitudinal direction of the electric wire 3 can be further reduced.

  Further, in the present embodiment, the five contactors 2 are made to enter the conductor portion 9 of the electric wire 3, but the number of the contactors 2 is suitably from one to a plurality depending on the outer diameter of the electric wire 3 and the like. It is possible to set.

  Next, another embodiment of the wire connection structure to which the present invention is applied will be described with reference to the drawings. In the present embodiment, a plurality of contacts are intruded into the conductor portion 9 of the electric wire 3 to hold the electric wire 3, but the shape of the contact is different from that of the above embodiment. Therefore, this difference will be mainly described. In the present embodiment, the same components as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 4, in the present embodiment, the needle-like contactor 21 is formed by being erected from one end face of the disc-like base end portion 22. The plurality of contacts 21 (four in FIG. 4) are integrally formed via the base end portion 22 by casting or the like, and are arranged in parallel at equal intervals along the outer peripheral surface of the virtual cylindrical body. Yes. Each contactor 21 includes a straight body portion 23 and a distal end portion 24 provided on the distal end side in the axial direction of the trunk portion 23 (front end side in the direction of insertion into the through hole). The body portion 23 is formed to have a substantially rectangular cross section, and the tip portion 24 is formed by bulging the protruding portion 25 in a direction away from at least the central axis of the virtual cylindrical body. The end surface 4 of the terminal 1 is formed with a circular through hole 26 through which the plurality of contacts 21 are inserted.

  The contact 21 thus formed is inserted into the through hole 26 of the terminal 1 from the direction indicated by the arrow in FIG. The contact 21 inserted into the through hole 26 is welded or the like with the disc-shaped base end portion 22 in contact with the periphery of the through hole 26 and is held by the terminal 1 in a cantilever manner. The operation of causing these contacts 21 to enter the conductor portion 9 from the end face of the electric wire 3 is the same as that in the above embodiment.

  According to this embodiment, since the plurality of contacts 21 are integrally formed, the work of assembling the contacts 21 to the end surface 4 of the terminal 1 is simplified as compared with the above-described embodiment. For this reason, the efficiency of the operation | work which attaches the contact 21 to the terminal 1 can be improved.

  On the other hand, in the present embodiment, as shown in FIG. 5, an annular metal piece 27 is attached in advance along the outer peripheral surface of the electric wire 3, and a plurality of contacts 21 are inserted into the conductor of the electric wire 3. Later, the metal piece 27 may be crimped. FIG. 6 shows a cross section of the electric wire 3 when FIG. 5 is viewed from the arrow BB direction. As shown in FIG. 6, the leading end portions 24 and the trunk portions 23 of the plurality of contacts 21 enter the conductor portion 9 of the electric wire 3 along the longitudinal direction of the electric wire 3. Here, the metal piece 27 is caulking the outer peripheral surface of the electric wire 3 facing the trunk portion 23 of the contactor 21, avoiding the distal end portion 24 of the contactor 21.

  According to this, since the covering portion 10 of the electric wire 3 can be pushed toward the trunk portion 23 of the contact 21 by caulking the metal piece 27, when a force in the pulling direction is applied to the contact 21. In addition, the protrusion 25 of the tip 24 of the contact 21 is caught by the pressed cover 10. Accordingly, the contact 21 can be restricted from moving along the longitudinal direction of the conductor portion 9. Thus, the holding force of the electric wire 3 can be remarkably increased only by caulking the metal piece 27 in a state where the contact 21 of the present embodiment has entered the conductor portion 9 of the electric wire 3.

  In the present embodiment, the contact 21 has been described as an example in which the protruding portion 25 bulges in a direction away from the central axis of the virtual cylindrical body. However, the present invention is not limited to this example. Even if the metal piece 27 is caulked against the structure of the contact 2, the same effect can be obtained. Moreover, the depth (dimension c in FIG. 6) at which the tip of the contactor 21 enters the conductor portion 9 can be appropriately set according to the width dimension of the metal piece 27 (horizontal direction in FIG. 6).

  As mentioned above, although embodiment of this invention has been explained in full detail with drawing, the said embodiment is only an illustration of this invention and this invention is not limited only to the structure of the said embodiment. Needless to say, changes in design and the like within the scope of the present invention are included in the present invention.

  For example, the tip of the contact is not limited to the example described above, that is, an example in which a conical shape or a protrusion is formed, and a circumferential groove is formed with a space in the front and rear in the axial direction. Also good. According to this, since the region sandwiched between the front and rear grooves bulges against the groove bottom of each groove, when it is inserted into the conductor part 9 of the electric wire 3, it bites into the conductor part 9. The effect can be expected.

DESCRIPTION OF SYMBOLS 1 Terminal 2, 21 Contact 3 Electric wire 5,26 Through-hole 6,23 Body part 7,24 Front-end | tip part 8 Eaves part 9 Conductor part 10 Covering part 22 Base end part 25 Protrusion part 27 Metal piece

Claims (2)

A wire connection structure for electrically connecting the terminal and the electric wire by allowing a needle-like contact connected to the terminal to enter the inside of the conductor from the end face of the electric wire,
The terminal is provided at one end with a joining portion having an abutting surface on which the end surface of the electric wire abuts substantially orthogonal to the extending direction of the terminal,
The contacts, said straight body portion which is cantilevered protruded in a direction away from the contact surface to the junction is more arranged parallel to each other around a virtual axis, the body portion of each contact protrusions provided protruding in a direction away from the previous SL virtual axis of the distal end portion,
The front end portion and the body portion of the contact are intruded into the conductor portion of the end surface of the electric wire, and the ring member attached to the outer peripheral surface of the electric wire is the body portion excluding the front end portion of the contact. electric wire connection structure of the outer peripheral surface pressure becomes Shimete of the wire opposite to. Each of the contacts protrudes from one surface of the support plate and is integrally formed with the support plate.
In the state where each contact is inserted into a through hole provided in the joint portion of the terminal, the support plate is formed on the periphery of the through hole on the surface opposite to the contact surface of the joint portion. The wire connection structure according to claim 1, wherein one surface is fixed.

Images