JP2015225802A - Terminal-provided wire and production method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration of waterproof performance of a waterproof member.SOLUTION: A terminal-provided wire includes a coated wire having a non-circular cross sectional shape, a terminal connected to the terminal part of the coated wire and a waterproof member which is attached to the coated wire and adheres an inner peripheral surface of a wire insertion hole matched to the outer shape of the coated wire to the outer peripheral surface of the coated wire. The terminal-provided wire has a shape retention member for retention of the shape of the coated wire attached between the terminal part of the coated wire and the waterproof member.

Description

  The present invention relates to an electric wire with a terminal to which a terminal is connected and a method for manufacturing the electric wire.

  Conventionally, a waterproof plug having an outer peripheral surface that is in close contact with the inner peripheral surface of the tubular portion for inserting the electric wire of the housing is attached to the covered electric wire, and the waterproof plug is accommodated in the tubular portion so as to be sandwiched between the front restraint portion and the rear holder. Thus, a waterproof connector for preventing water from entering the terminal portion of the electric wire is known (for example, see Patent Document 1).

  In the waterproof connector described in Patent Document 1, a waterproof plug is formed with a circular cross-section electric wire insertion hole that matches the outer shape of the covered electric wire having a circular cross section, and the covered electric wire is inserted into the electric wire insertion hole, thereby waterproofing. The inner peripheral surface of the plug is brought into close contact with the outer peripheral surface of the covered electric wire, and the waterproof function between the waterproof plug and the covered electric wire is exhibited.

JP 2014-44802 A

  In recent years, for example, when a plurality of covered electric wires are bundled and used, such as a three-phase AC electric wire, a cross-sectional fan-shaped covered electric wire having a central angle of 120 °, for example, rather than combining three covered electric wires having a circular cross section. Since the cross-sectional area of the entire bundle of electric wires can be reduced by combining the three wires so that the entire cross-sectional shape is circular, a covered electric wire with a non-circular cross-section is drawing attention.

  When applying a waterproof plug as described above to such a non-circular cross-section covered electric wire, for example, a non-circular cross-section wire insertion hole that matches the shape of the non-circular cross-section covered electric wire is formed in the waterproof plug. The adhesiveness between the inner peripheral surface of the electric wire insertion hole of the waterproof plug and the outer peripheral surface of the covered electric wire is ensured by inserting the covered electric wire having a circular cross section into the electric wire insertion hole.

  However, when using a covered electric wire with a non-circular cross section, if the terminal is connected to the end of the covered electric wire fitted with a waterproof plug by crimping or the like, the shape of the electric wire in the waterproof plug attached portion will change along with the deformation of the core wire in the terminal connecting portion The present inventor has also found that the adhesion between the covered electric wire and the waterproof plug at the waterproof plug mounting portion is lowered.

In other words, since a circle with a constant area and a minimum circumference is a circle, in the case of a covered electric wire with a circular cross section, which is a general electric wire, when connecting a terminal to the end of the covered electric wire with a waterproof plug Even if the wire shape of the terminal connection part is deformed into a non-circular cross section, since the circumference of the insulating material covering the outer periphery of the core wire is the minimum corresponding to the circular shape of the cross section, the deformation of the wire shape propagates to the waterproof plug mounting part Hard to do.
However, such an effect cannot be expected with a non-circular cross-section covered wire, and if the distance between the terminal mounting portion and the waterproof plug mounting portion is short, the waterproof plug follows the deformation of the wire shape at the terminal mounting portion. The wire shape of the mounting part is deformed, and a gap is created between the outer peripheral surface of the sheath of the wire and the inner peripheral surface of the wire insertion hole of the waterproof plug, reducing the waterproof effect due to adhesion, reducing the waterproof performance of the waterproof plug I found out.

  This invention provides the electric wire with a terminal which can eliminate the problem by the prior art mentioned above, and can prevent the fall of the waterproof performance by the waterproof plug with which the covering electric wire of the section noncircular shape was installed, and its manufacturing method With the goal.

  The terminal-attached electric wire according to the present invention includes a covered electric wire having a non-circular cross section, a terminal connected to a terminal portion of the covered electric wire, and an electric wire insertion hole that is attached to the covered electric wire and matches the outer shape of the covered electric wire. A terminal-attached electric wire provided with a waterproof member having an inner peripheral surface in close contact with the outer peripheral surface of the covered electric wire, the shape of the covered electric wire being maintained between the terminal portion of the covered electric wire and the waterproof member The shape holding member to be attached is attached.

  According to the electric wire with terminal according to the present invention, the shape holding member that holds the shape of the covered electric wire is attached between the terminal portion of the covered electric wire to which the terminal is connected and the waterproof member. For this reason, even if the covered electric wire located on the rear side of the terminal portion is deformed so as to collapse from the original shape so as to follow the deformation of the terminal portion when the terminal is connected, it is ahead of the mounting position of the waterproof member. In this part (terminal part side), the shape of the covered electric wire is held by the attached shape holding member.

  Thereby, since it can suppress that a deformation | transformation of a terminal part reaches the attachment location of the waterproof member of a covered wire, it deform | transforms between the outer peripheral surface of a covered electric wire, and the inner peripheral surface of the electric wire penetration hole of a waterproof member. There is no non-uniformity in contact force between the two due to. Therefore, the generation of a gap based on this is prevented, and it is possible to prevent the waterproof performance from being deteriorated by the waterproof member.

  In one Embodiment of this invention, the said covered electric wire is a fan-shaped electric wire of a cross-sectional fan shape.

  In other embodiment of this invention, the terminal part of the said covered electric wire connected with the said terminal is deform | transforming from the original shape into the substantially rounded-round rectangular shape, the substantially circular shape, or the substantially elliptical shape.

  In still another embodiment of the present invention, the shape holding member is a frame-shaped member that surrounds the outer peripheral surface of the covered electric wire in accordance with the shape of the covered electric wire.

  In still another embodiment of the present invention, the frame member is made of a metal material or a high-strength resin material.

  In still another embodiment of the present invention, the waterproof member is made of an oil-impregnated elastic material.

  The method for manufacturing a terminal-attached electric wire according to the present invention includes a step of attaching a waterproof member in which a wire insertion hole matching the outer shape of the covered electric wire is attached to the non-circular cross-section of the covered electric wire, It has the process of attaching the shape holding member which hold | maintains the shape of the said covered electric wire to the terminal part side rather than the attachment location of a waterproof member, and the process of connecting a terminal to the terminal part of the said covered electric wire, It is characterized by the above-mentioned.

  According to the manufacturing method of the electric wire with a terminal concerning the present invention, the electric wire with a terminal which has the same operation effect as the operation effect of the above-mentioned electric wire with a terminal can be manufactured easily.

  ADVANTAGE OF THE INVENTION According to this invention, the fall of the waterproof performance by a waterproof member can be prevented.

It is a perspective view showing an electric wire with a terminal concerning one embodiment of the present invention. It is sectional drawing of the electric wire with the terminal. It is sectional drawing which shows the electric wire with a terminal of a comparative example. It is a flowchart which shows the manufacturing process by the manufacturing method of the electric wire with a terminal concerning one embodiment of the present invention. It is sectional drawing which shows the electric wire with a terminal for every manufacturing process.

  Hereinafter, a terminal-attached electric wire and a method for manufacturing the same according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing a terminal-attached electric wire according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a terminal-attached electric wire. FIG. 3 is a cross-sectional view showing a terminal-attached electric wire of a comparative example. As shown in FIGS. 1 and 2, the terminal-attached electric wire 1 includes a covered electric wire 10, a terminal 20 connected to the core wire 11 of the terminal portion 15 of the covered electric wire 10, and a covered electric wire behind the terminal 20. 10 is a waterproof plug 30 that is a waterproof member mounted on the outer peripheral surface 12a, and a collar 40 that is a shape-retaining member attached to the outer peripheral surface 12a of the covered electric wire 10 at a portion ahead of the distal end surface 33 of the waterproof plug 30. And is configured.

  The covered electric wire 10 has a structure in which a core wire 11 made of a conductive material such as copper or aluminum is covered with a cover 12 made of an insulating material such as an insulating resin. The core wire 11 is formed by twisting a plurality of strands. The outer peripheral surface 12 a of the covered electric wire 10 is synonymous with the outer peripheral surface of the covering 12. The covered electric wire 10 is formed so that the cross-sectional shape is a non-circular shape, for example, a fan shape.

  Here, the fan shape or the fan shape means a shape surrounded by one arc portion and two radius portions passing through both ends thereof. Further, the two radius portions are not necessarily less than 180 °, and may be, for example, semicircular. Moreover, the cross-sectional shape of the main part of the covered electric wire 10 is not a strict fan shape, but may be a substantially fan shape.

  Since the cross-sectional shape of the main portion of the covered electric wire 10 is a fan shape, for example, in the form of a bundled electric wire in which a plurality of the covered electric wires 10 are bundled, the overall outer diameter is larger than that of a general round electric wire having an existing circular conductor. Can be reduced. Therefore, it is possible to save space such as a wiring space of the entire electric wire bundled with the main parts of the covered electric wire 10.

  If the conductive material of the core wire 11 is made of aluminum instead of copper, the weight of the covered electric wire 10 can be reduced. However, in this case, the conductivity of the core wire 11 is lower than that of copper. For this reason, when it is going to form the covered electric wire 10 which has the electrical conductivity similar to copper with aluminum, the size of the core wire 11 will necessarily become large. In this regard, according to the terminal-attached electric wire 1 of the present embodiment, since the cross-sectional shape of the covered electric wire 10 is a fan shape, for example, the overall outer diameter when three wires are bundled can be reduced, and the entire electric wire is large. Can be suppressed.

  Further, when the fan-shaped covered electric wire 10 is constituted by the core wire 11 having the same cross-sectional area as the cross-sectional area of the core wire and the thickness of the covering of the conventional round electric wire, and the covering 12 having the thickness, the outer peripheral surface 12a of the covering 12 The length of the entire circumference (peripheral length) is about 1.13 times that of the round electric wire. For this reason, when deform | transforming from a fan shape to circular shape, it has the characteristic that the contact | adherence condition of the core wire 11 and the coating | cover 12 becomes loose compared with a round electric wire. For this reason, even if the covered electric wire 10 is returned to the circular cross section at the waterproof plug 30, the covering 12 sag with respect to the core wire 11, and the desired waterproof performance cannot be ensured. For this reason, it is necessary to make the electric wire insertion hole 31 of the waterproof plug 30 into a fan shape matching the outer shape of the covered electric wire 10 as described later.

  On the other hand, the terminal 20 is formed by punching / bending a metal base material. The terminal 20 includes an electric wire connecting portion 21 electrically connected to the core wire 11 of the terminal portion 15 of the covered electric wire 10 by ultrasonic welding, crimping, or the like, and an electric contact portion extending from the electric wire connecting portion 21 to the tip side (forward). 22 integrally. The electric wire connection part 21 has the connection barrel part 21a arranged upright so as to oppose the both sides which pinched | interposed the terminal part 15 in the horizontal direction. The electrical contact portion 22 is a portion that comes into contact with and is connected to a terminal, an auxiliary machine, or the like, not shown.

  The terminal 20 of this embodiment is connected to a rod-shaped terminal such as a battery terminal, for example, and has a flat plate shape extending in the axial direction of the covered electric wire 10. And the through-hole 22a in which a rod-shaped terminal is penetrated is formed in the front end side of the electrical contact part 22, for example. In addition, the specific shape and structure of the terminal of the electric wire with a terminal which concerns on this invention are not limited, The terminal which has what is called a male and female fitting shape may be sufficient.

  The waterproof plug 30 is made of rubber which is an oil-impregnated elastic material, for example. The waterproof plug 30 has a non-circular cross section corresponding to the shape of the covered electric wire 10, for example, a cylindrical shape having a wire insertion hole 31 formed of a fan-shaped through hole at the center. The waterproof plug 30 has an outer peripheral surface 30a that can be in close contact with an inner peripheral surface of a hole having a circular cross section formed in a housing or the like (not shown). The wire insertion hole 31 of the waterproof plug 30 has an inner peripheral surface 31 a that can be in close contact with the outer peripheral surface 12 a of the covered electric wire 10.

  The collar 40 is attached between the terminal portion 15 of the covered electric wire 10 and the waterproof plug 30, specifically, on the outer peripheral surface 12 a of the covered electric wire 10 at the front portion 33 of the waterproof plug 30. The collar 40 is made of a hard-to-deform frame member that is formed in a fan shape so as to surround the outer periphery of the fan-shaped covered electric wire 10. The collar 40 is made of a metal material such as stainless steel or a high-strength resin such as reinforced plastic. When the collar 40 is made of a metal material, for example, the collar 40 is formed to have a thickness of about 1 mm.

  In the thus configured terminal-attached electric wire 1, the terminal portion 15 of the covered electric wire 10 is a connection portion with the terminal 20. The terminal portion 15 has the coating 12 removed and the core wire 11 exposed. In addition, the terminal portion 15 is connected to the electric wire connecting portion 21 of the terminal 20 by ultrasonic welding or the like. Thereby, the cross section of the terminal portion 15 is deformed into, for example, a substantially rounded rectangular shape (or a substantially circular shape or a substantially elliptical shape).

  For this reason, the core wire 11 of the covered electric wire 10 from the deformed portion of the terminal portion 15 to the waterproof plug 30 on the rear side follows, for example, the substantially rounded rectangular shape of the terminal portion 15 (so that it is dragged). The original fan shape collapses and deforms. In particular, the closer to the terminal portion 15, the more severe the deformation, and the influence extends to the place where the waterproof plug 30 is attached.

  In this case, as in the comparative example shown in FIG. 3, when the collar 40 is not attached on the outer peripheral surface 12 a of the front end surface 33 of the waterproof plug 30, The core wire 11 of the electric wire 10 tries to return to a circular shape, and a gap 32 that impairs waterproofing is generated between the outer peripheral surface 12a of the covering 12 and the inner peripheral surface 31a of the electric wire insertion hole 31 of the waterproof plug 30.

  Thus, if the collar 40 is not attached, the waterproof effect due to the close contact between the covered electric wire 10 and the waterproof plug 30 is diminished, and the waterproof performance of the waterproof plug 30 is significantly deteriorated.

  On the other hand, as shown in FIG. 2, when the collar 40 is attached, the covered electric wire 10 located on the rear side of the terminal unit 15 has the original fan shape with the deformation of the terminal unit 15 to which the terminal 20 is connected. Even if deformed so as to collapse, the shape of the covered electric wire 10 is maintained by the attached collar 40 at a portion ahead of the place where the waterproof plug 30 is attached.

  In other words, the inner peripheral surface 40a of the collar 40 is in close contact with the outer peripheral surface 12a of the covered electric wire 10, and suppresses a force to deform from a fan shape to a different shape. Thereby, the influence of the deformation of the terminal portion 15 does not reach the mounting position of the waterproof plug 30, and the outer peripheral surface 12 a of the covered electric wire 10 and the inner peripheral surface 31 a of the electric wire insertion hole 31 at the mounting position of the waterproof plug 30. There is no gap 32 due to non-uniform contact force between them. Therefore, the waterproof performance by the waterproof plug 30 can be maintained.

Next, the manufacturing process of the electric wire 1 with a terminal which concerns on this embodiment is demonstrated.
FIG. 4 is a flowchart showing a manufacturing process according to the method of manufacturing the electric wire with terminal according to the embodiment of the present invention. Drawing 5 is a sectional view showing an electric wire with a terminal for every manufacturing process. Here, the manufacturing process will be described with reference to the flowchart of FIG.

  First, as shown to Fig.5 (a), the covered electric wire 10 which has the core wire 11 and the coating | cover 12 and was formed in the fan shape of a non-circular cross section is prepared. Next, as shown in FIG. 5B, the waterproof plug 30 is attached to the covered electric wire 10 through the covered electric wire 10 through the electric wire insertion hole 31 of the waterproof plug 30 (step S100). Since the waterproof plug 30 is an oil-impregnated type, mounting is relatively easy.

  5C, the collar 40 is inserted in the insertion direction indicated by the arrow in FIG. 5C toward the front end surface 33 of the waterproof plug 30, and the inner peripheral surface 40a of the collar 40 and the covering are covered. The collar 40 is attached to the covered electric wire 10 so that the outer peripheral surface 12a of the electric wire 10 is in close contact (step S102).

  Then, as shown in FIG.5 (d), the coating | cover 12 in the terminal part 15 of the part ahead of the mounting location of the collar 40 of the covered electric wire 10 is removed (step S104), and the core wire 11 is exposed. Finally, as shown in FIG. 5 (e), the wire connecting portion 21 of the terminal 20 is connected to the terminal portion 15 by ultrasonic welding, resistance welding, crimping or the like (step S106), and the electric wire 1 with terminal is manufactured.

  In addition, the removal process of the coating | cover 12 in the said step S104 should just be performed prior to the connection process of the terminal 20 in the said step S106. Therefore, the removal process of the covering 12 may be performed before the mounting process of the collar 40 in the above step S102. However, in the case of using an oil-impregnated elastic material for the waterproof plug 30 as in this example, in order to avoid the oil from adhering to the core wire 11, in the sense that the time for which the core wire 11 is exposed is reduced as much as possible. It is desirable to remove the coating 12 after the collar 40 is installed. Thus, in the manufacturing process according to the present embodiment, the terminal-attached electric wire 1 can be easily manufactured.

DESCRIPTION OF SYMBOLS 1 Electric wire with a terminal 10 Coated electric wire 11 Core wire 12 Coated 12a Outer peripheral surface 15 Terminal part 20 Terminal 21 Electric wire connection part 21a Connection barrel part 22 Electrical contact part 22a Through hole 30 Waterproof plug 30a Outer peripheral surface 31 Electric wire insertion hole 31a Inner peripheral surface 32 Crevice 33 Front end face 40 Color 40a Inner peripheral face

Claims (7)

A non-circular cross-section covered electric wire;
A terminal connected to a terminal portion of the covered electric wire;
A wire with a terminal, comprising: a waterproof member attached to the covered electric wire, and having an inner peripheral surface of an electric wire insertion hole matched to the outer shape of the covered electric wire adhered to the outer peripheral surface of the covered electric wire,
A shape holding member that holds the shape of the covered electric wire is attached between the terminal portion of the covered electric wire and the waterproof member. The electric wire with a terminal according to claim 1, wherein the covered electric wire is a fan-shaped electric wire having a fan-shaped cross section. The terminal part of the said covered electric wire connected with the said terminal is deform | transforming from the original shape into the substantially round-round rectangular shape, the substantially circular shape, or the substantially elliptical shape in the cross section. Electric wire with terminal. The said shape holding member is a frame-shaped member surrounding the outer peripheral surface of the said covered electric wire according to the shape of the said covered electric wire. The electric wire with a terminal of any one of Claims 1-3 characterized by the above-mentioned. The said frame-shaped member consists of a metal material or a high-strength resin material. The electric wire with a terminal of Claim 4 characterized by the above-mentioned. The said waterproof member consists of an oil impregnation elastic material. The electric wire with a terminal of any one of Claims 1-5 characterized by the above-mentioned. A step of attaching a waterproof member in which a wire insertion hole matched to the outer shape of the covered electric wire is attached to the non-circular covered electric wire,
A step of attaching a shape holding member that holds the shape of the covered electric wire to the terminal portion side from the mounting location of the waterproof member of the covered electric wire;
And a step of connecting a terminal to a terminal portion of the covered electric wire.

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