JP2017103073A - Wire with terminal and manufacturing method of wire with terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an adhesive from flowing out when thermally shrinking a heat-shrinkable tube, and to improve adhesiveness of the adhesive to a terminal surface.SOLUTION: A wire 10 with terminal comprises: a terminal 20 which includes a wire connection part 22, a mating connection part 26 and a coupling part 28 and with which a rugged portion 29 is formed on an at least partial surface of the coupling party 28; a wire 30 of which an exposed core portion 33 in an end is connected to the wire connection part 22; a heat-shrinkable tube 40 which is thermally shrunk while covering a connection portion of the wire 30 and the wire connection part 22 and the rugged portion 29; and an adhesive 50 which fills a gap between the connection portion of the wire 30 and the wire connection part 22 and the heat-shrinkable tube 40 and fills a gap between the rugged portion 29 and the heat-shrinkable tube 40.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a technique for attaching a heat shrinkable tube to a connection portion between a terminal and an electric wire.

  In Patent Document 1, an insulating member such as a thermoplastic resin is placed on a crimping portion between a terminal and an electric wire, and a heat-shrinkable tube is covered so as to wrap the crimping portion on which this member is placed, and this heat-shrinkable tube is heated. Thus, a technique for contraction is disclosed.

JP 2012-94340 A

  However, according to the technique disclosed in Patent Document 1, when the heat-shrinkable tube is thermally contracted, an insulating member such as a thermoplastic resin may flow into the terminal main body. When the insulating member adheres to the terminal main body, a contact failure or the like may occur between the terminal main body and the counterpart member.

  Moreover, the heat-shrinkable tube normally stores a cylindrical initial shape, and contracts to a cylindrical initial shape by heating. For this reason, even when the heat-shrinkable tube covers the plate-like portion of the terminal and heat-shrinks, it is trying to return to the cylindrical shape. In this state, if the adhesive is deteriorated, a gap may be generated between the terminal surface and the heat-shrinkable tube.

  Accordingly, an object of the present invention is to suppress the flow of the adhesive when the heat-shrinkable tube is thermally contracted, and to improve the adhesiveness of the adhesive to the terminal surface.

  In order to solve the above-described problem, the terminal-attached electric wire according to the first aspect includes an electric wire connecting portion, a mating side connecting portion, and a flat plate-like connecting portion that connects the electric wire connecting portion and the mating side connecting portion. A terminal having a concavo-convex portion formed on at least a part of the surface of the connecting portion, an electric wire having an exposed core wire portion connected to the electric wire connecting portion, and a connecting portion between the electric wire and the electric wire connecting portion. The heat-shrinkable tube that is heat-shrinked in a state of covering the uneven portion, the connection portion between the electric wire and the wire connecting portion, and the heat-shrinkable tube are filled, and the uneven portion and the heat-shrinkable tube are filled And an adhesive filling the gap.

  A 2nd aspect is an electric wire with a terminal which concerns on a 1st aspect, Comprising: The said uneven | corrugated | grooved part includes a ditch | groove or a protruding item | line part along the width direction of the said connection part.

  A 3rd aspect is an electric wire with a terminal concerning the 2nd aspect, Comprising: The said ditch | groove or the said protruding item | line part is formed over the whole width direction of the said connection part.

  Moreover, in order to solve the said subject, the manufacturing method of the electric wire with a terminal which concerns on a 4th aspect connects (a) electric wire connection part, the other party connection part, the said electric wire connection part, and the said other party connection part. A step of preparing a terminal including an uneven portion formed on at least a part of the surface of the connecting portion, and an electric wire in which an exposed core portion of the end portion is connected to the electric wire connecting portion. (B) a step of covering the connecting portion between the electric wire and the electric wire connecting portion and the uneven portion; and (c) a connecting portion between the electric wire and the electric wire connecting portion; A step of disposing an adhesive between the shrinkable tube, and (d) shrinking the heat shrinkable tube by heating, and between the connection portion of the wire and the wire connecting portion and the heat shrinkable tube, And disposing the adhesive between the uneven portion and the heat shrinkable tube; Equipped with a.

  According to the 1st-4th aspect, the uneven | corrugated | grooved part is formed in the surface of at least one part of the connection part of a terminal. For this reason, even if the adhesive inside the heat shrinkable tube tries to flow into the mating connecting portion side when the heat shrinkable tube is thermally contracted, the flow is suppressed by the uneven portion. Moreover, the adhesive agent that has flowed into the concavo-convex portion of the connecting portion solidifies in the same shape. For this reason, the uneven | corrugated | grooved part of a connection part and an adhesive agent are adhere | attached firmly. For this reason, when the heat-shrinkable tube is thermally contracted, it is possible to suppress the flow of the adhesive and to improve the adhesiveness of the adhesive to the terminal surface.

  According to the 2nd aspect, since the said uneven | corrugated | grooved part contains the ditch | groove or the protruding item | line part along the width direction of the said connection part, an adhesive agent does not flow easily into the other party connection part side.

  According to the 3rd aspect, since the ditch | groove or the protruding item | line part is formed over the whole width direction of the said connection part, an adhesive agent does not flow easily into the other party connection part side in the whole width direction of a connection part. .

It is a schematic plan view which shows the electric wire with a terminal which concerns on embodiment. It is a schematic side view which shows an electric wire with a terminal. It is a schematic sectional drawing in the III-III line of FIG. FIG. 4 is a partially enlarged view of FIG. 3. It is explanatory drawing which shows the manufacturing process of an electric wire with a terminal. It is explanatory drawing which shows the manufacturing process of an electric wire with a terminal. It is explanatory drawing which shows the manufacturing process of an electric wire with a terminal.

  Hereinafter, the electric wire with a terminal concerning the embodiment and its manufacturing method are explained. 1 is a schematic plan view showing a terminal-attached electric wire 10, FIG. 2 is a schematic side view showing the terminal-attached electric wire 10, FIG. 3 is a schematic cross-sectional view taken along the line III-III of FIG. FIG. 4 is a partially enlarged view of FIG. 3.

  The electric wire with terminal 10 includes a terminal 20, an electric wire 30, a heat shrinkable tube 40, and an adhesive 50.

  The terminal 20 is a member integrally formed by press-molding a metal plate material such as copper, copper alloy, aluminum, or aluminum alloy, and includes a wire connection portion 22, a mating connection portion 26, and a coupling portion 28.

  The electric wire connecting portion 22 is a portion to which an exposed core portion 33 (described later) of the electric wire 30 is connected. Here, the electric wire connecting portion 22 has a pair of covering caulking portions 24 extending outward from both side portions of one end portion of the strip-shaped base portion 23 (the end portion on the opposite side to the mating side connecting portion 26). It is configured.

  Then, in a state in which the end portion of the covering portion 34 is disposed on the base portion 23 and between the pair of covering caulking portions 24, the pair of covering caulking portions 24 are plastically deformed inward to form a pair of covering caulking portions. 24 is fixed by caulking to the end portion of the covering portion 34.

  Further, in this state, the exposed core part 33 is joined to one main surface of the base part 23. That is, the exposed core part is connected to the wire connection part 22 so as to be positioned on the one main surface side of the terminal 20. The exposed core portion 33 and the base portion 23 can be joined by ultrasonic welding, resistance welding, soldering, or the like. A pair of core wire caulking portions are extended on both sides of the base portion 23 at positions closer to the mating connecting portion 26 than the pair of covering caulking portions 24, and the pair of core wire caulking portions are caulked and fixed to the exposed core wire portion 33. It may be configured. The covering caulking portion 24 may be omitted.

  The mating side connection portion 26 is a portion to which a mating member that is an electrical connection destination of the terminal-attached electric wire 10 is connected. Here, the counterpart connection portion 26 is formed in a plate shape (more specifically, a disc shape) in which a hole 26h is formed. Then, when the bolt erected on the mating member is inserted into the hole 26h, the nut is fastened to the bolt, whereby the mating connection portion 26 is fixed to the mating member. In addition to the above-described configuration, the mating connection portion may be formed in a pin-shaped or tab-shaped male terminal shape, or a cylindrical female terminal shape.

  The connecting portion 28 is formed in a flat plate shape that connects the wire connecting portion 22 and the counterpart connecting portion 26. More specifically, it is formed in an elongated plate shape having a constant width. An uneven portion 29 is formed on at least a part of the surface of the connecting portion 28. Here, the concavo-convex portions 29 are formed on both the front and back surfaces of the portion of the connecting portion 28 that is close to the mating connection portion 26 and that is covered with the heat-shrinkable tube 40. The concavo-convex portions 29 are configured such that the concave grooves 29 a and the ridge portions 29 b are alternately formed along the direction connecting the wire connection portion 22 and the counterpart connection portion 26. The concave groove 29 a is an elongated groove formed along the width direction of the connecting portion 28, and is here formed over the entire width direction of the connecting portion 28. The protruding portion 29 b is a long and narrow protrusion formed along the width direction of the connecting portion 28, and is formed over the entire width direction of the connecting portion 28 here. The uneven portion 29 is formed by pressing the connecting portion 28. For this reason, the convex part 29b is formed in the main surface on the opposite side of the part in which the concave groove 29a was formed among the one main surfaces of the connection part 28, and the convex line part 29b is in one main surface of the connection part 28. A concave groove 29a is preferably formed on the main surface on the opposite side of the formed portion. In addition, it is not essential that the concavo-convex portions 29 are formed on both surfaces of the connecting portion 28, and the concavo-convex portions 29 only need to be formed on one of the main surfaces of the connecting portion 28.

  In addition, the ditch | groove and the protruding item | line part may be formed along the said width direction in a part of width direction of a connection part. Moreover, it is not essential that the concavo-convex part is formed by a concave groove or a ridge part having the shape as described above. The uneven portion may have a concave or convex shape such as a spherical shape, a cylindrical shape, or a cone shape. Moreover, the uneven | corrugated | grooved part may be a shape containing the recessed part or convex part of an irregular shape. Further, the concavo-convex portion may be formed by cutting using a cutting blade, a file, or the like. The size of the concave or convex portion of the concave and convex portion is not particularly limited, but in order to effectively improve the inflow prevention effect and the adhesive effect described later, the width of the minimum portion of the concave groove and each convex portion is 100 μm or more. Is preferred. If a concave portion is formed on the plane of the connecting portion, the surrounding portion can be evaluated as a relatively convex portion, and if a convex portion is formed on the surface of the connecting portion, the surrounding portion is relatively It can be evaluated that it is a recessed part.

  The electric wire 30 includes a core wire 32 and a covering portion 34.

  The core wire 32 is a linear member formed of a metal such as copper, a copper alloy, aluminum, or an aluminum alloy. The core wire 32 may be comprised with the single core wire, and may be comprised with the strand wire of the some strand.

  The covering portion 34 is a portion formed of an insulating material such as a resin, and is formed by extrusion-coating the insulating material around the core wire 32.

  The covering portion 34 is peeled off at the end portion of the electric wire 30, and the exposed core portion 33 is formed at the end portion of the electric wire 30. The exposed core portion 33 is connected to the electric wire connecting portion 22.

  The heat-shrinkable tube 40 is a member that is heat-shrinked in a state in which the connection portion between the electric wire 30 and the electric wire connection portion 22 and the uneven portion 29 are covered. The heat-shrinkable tube 40 that has undergone heat shrinkage covers at least the connection portion between the exposed core wire portion 33 and the wire connection portion 22. The heat-shrinkable tube 40 extends to the connecting portion 28 side and covers a portion of the connecting portion 28 where the uneven portion 29 is formed. However, it is not necessary that all the concavo-convex portions 29 formed in the connecting portion 28 are accommodated in the heat shrinkable tube 40, and they may protrude from the end of the heat shrinkable tube 40. It is preferable that the end portion of the heat shrinkable tube 40 on the side where the electric wire 30 extends is positioned so as to reach the covering portion 34 beyond the base end portion of the terminal 20.

  The heat-shrinkable tube 40B (see FIG. 6) before heat-shrinking is a cylindrical member formed of a polyolefin resin or the like. The heat-shrinkable tube 40B is formed by, for example, a member that has been formed into a relatively thin cylindrical shape by extrusion molding, further stretched into a thick cylindrical shape in a heated state, and then cooled. Manufactured. The heat-shrinkable tube 40B thus obtained has a shape memory characteristic that, when heated, contracts to a thin cylindrical shape before being stretched. The inner diameter of the heat-shrinkable tube 40B is set to a size that can accommodate the exposed core wire portion 33 and the wire connecting portion 22 therein. Moreover, the length dimension of the heat shrinkable tube 40B is set to a size that covers the connecting portion of the exposed core portion 33 and the wire connecting portion 22 and covers the uneven portion 29 of the connecting portion 28 after the heat shrinking. Yes. The heat-shrinkable tube 40 after the heat shrinkage is a member that is heat-shrinked in a state in which the heat-shrinkable tube 40B before the heat shrinkage covers the exposed core wire portion 33 and the connection portion of the wire connecting portion 22 and the uneven portion 29. is there.

  The adhesive 50 is formed of a resin that is softened by heat called a hot melt adhesive or the like, and is disposed so as to fill the inside of the heat shrinkable tube 40. Inside the heat shrinkable tube 40, the adhesive 50 fills between the heat shrinkable tube 40 at the connection portion between the electric wire 30 and the wire connecting portion 22, and fills between the uneven portion 29 and the heat shrinkable tube 40. , A member interposed between them in a filling state. In particular, in the portion where the concavo-convex portion 29 is formed, the adhesive 50 is interposed between the surface of the concavo-convex portion 29 and the inner peripheral surface of the heat-shrinkable tube 40 in a filled state while entering the concave groove 29a. ing. By this adhesive 50, it is possible to prevent external liquid from entering the connecting portion between the exposed core wire portion 33 and the wire connecting portion 22, particularly the exposed core wire portion 33.

  For example, the adhesive 50 is provided inside the heat-shrinkable tube 40B, and the heat-shrinkable tube 40B is softened when the heat-shrinkable tube 40B is heat-shrinked. It can interpose in the inside of a packing. The adhesive 50 may be applied or attached in advance to at least a part of the outer peripheral surfaces of the exposed core wire portion 33 and the wire connection portion 22 before covering the heat shrinkable tube 40B.

  A method for producing the terminal-attached electric wire 10 will be described.

  First, as shown in FIG. 5, one in which the electric wire connecting portion 22 of the terminal 20 and the exposed core portion 33 of the electric wire 30 are connected is prepared (step (a)). The connecting portion 28 of the terminal 20 has an uneven portion 29 formed therein.

  Next, as shown in FIG. 6, the heat shrinkable tube 40 </ b> B provided with the adhesive 50 on the inner layer is covered so as to cover the connection portion between the mating connection portion 26 and the end portion of the electric wire 30 and the uneven portion 29. (Step (b)). Since the adhesive 50 is previously provided inside the heat shrinkable tube 40B, the adhesive 50 is disposed between the connection portion between the electric wire 30 and the electric wire connecting portion 22 and the heat shrinkable tube 40B in this state. (Step (c)).

  In this state, as shown in FIG. 7, the heat-shrinkable tube 40B and the adhesive 50 are heated by a heating device 70 such as a heater. Then, the heat-shrinkable tube 40B is heat-shrinked and the adhesive 50 is softened. Then, the heat-shrinkable tube 40 </ b> B is heat-shrinked into a shape corresponding to the outer shape of the end portion of the electric wire 30 and the electric wire connecting portion 22 to become the heat-shrinkable tube 40. At the same time, the softened adhesive 50 spreads in a filling manner inside the heat-shrinkable tube 40 that has been heat-shrinked at the end portion of the electric wire 30 and the electric wire connecting portion 22 and before and after that. At this time, an excess amount of the softened adhesive 50 tends to flow outward from both ends of the heat shrinkable tube 40. In particular, the adhesive 50 that has flowed out from the mating connection part 26 in the heat shrinkable tube 40 tends to flow out to the mating connection part 26. However, since the softened adhesive 50 accumulates in the concave groove 29a at the concavo-convex portion 29, the excess adhesive 50 is prevented from flowing out. Moreover, when the adhesive 50 moves on the concavo-convex portion 29, the flow rate of the adhesive 50 is slowed by the concavo-convex shape, and the flow of the adhesive 50 from the heat-shrinkable tube 40 can also be suppressed from that point. I can expect.

  In addition, since the adhesive 50 is solidified in a filled state between the uneven portion 29 and the heat-shrinkable tube 40, the adhesive 50 and the uneven portion 29 have a structure that fits into each other. The adhesion area of becomes larger. For this reason, the heat-shrinkable tube 40 and the concavo-convex portion 29 are bonded to each other with a relatively large adhesive force by the adhesive 50.

  According to the terminal-attached electric wire 10 configured as described above and the manufacturing method thereof, the uneven portion 29 is formed on at least a part of the surface of the connecting portion 28 of the terminal 20. For this reason, when the heat shrinkable tube 40 </ b> B thermally shrinks, even if the adhesive 50 inside the heat shrinkable tube 40 </ b> B tries to flow into the mating connection portion 26, the flow is suppressed by the uneven portion 29. For this reason, when the counterpart connection portion 26 is connected to the counterpart connection member, the adhesive 50 is unlikely to cause a contact failure, and the terminal 20 and the counterpart connection member can be more reliably and stably connected. . Further, the adhesive 50 that has flowed into the concavo-convex portion 29 of the connecting portion 28 is solidified in the same shape. For this reason, the uneven part 29 and the adhesive 50 are firmly bonded, and the heat shrinkable tube 40 and the uneven part 29 are also firmly bonded via the adhesive 50. For this reason, even if the adhesive 50 is deteriorated due to vehicle environmental factors under the condition that the heat shrinkable tube 40 returns to the initial shape before the heat shrinkage, the end portion of the heat shrinkable tube 40 and the uneven portion 29 are It is difficult to form a gap in the opponent. Thereby, the water stop property of the heat-shrinkable tube 40 can be maintained more reliably.

  Moreover, since the uneven | corrugated | grooved part 29 contains the ditch | groove 29a or the protruding item | line part 29b along the width direction of the connection part 28, the adhesive agent 50 accumulates around the said elongate ditch | groove 29a or the protruding item | line part 29b. For this reason, it is difficult for the adhesive 50 to flow into the counterpart connection part 26 side.

  In addition, since the concave groove 29 a or the convex strip portion 29 b is formed over the entire width direction of the connecting portion 28, the adhesive 50 hardly flows into the mating connection portion 26 in the entire width direction of the connecting portion 28.

{Modifications}
In addition, each structure demonstrated in the said embodiment and each modification can be suitably combined unless it mutually contradicts.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Electric wire with a terminal 20 Terminal 22 Electric wire connection part 26 Opposite side connection part 28 Connection part 29 Concave part 29a Concave groove 29b Convex part 30 Electric wire 32 Core wire 33 Exposed core wire part 34 Covering part 40, 40B Heat shrinkable tube 50 Adhesive

Claims (4)

A terminal including an electric wire connecting portion, a mating side connecting portion, and a flat plate-like connecting portion that connects the electric wire connecting portion and the mating side connecting portion, and an uneven portion formed on at least a part of the surface of the connecting portion. When,
An electric wire in which an exposed core part at an end is connected to the electric wire connection part;
A heat-shrinkable tube that is heat-shrinked in a state of covering the connecting portion between the electric wire and the electric-wire connecting portion, and the uneven portion;
An adhesive that fills a space between the heat shrinkable tube and a connection portion between the electric wire and the wire connection portion, and fills a gap between the uneven portion and the heat shrinkable tube,
An electric wire with a terminal. It is an electric wire with a terminal according to claim 1,
The concavo-convex portion is a terminal-attached electric wire including a concave groove or a ridge portion along the width direction of the connecting portion. It is an electric wire with a terminal according to claim 2,
The said ditch | groove or the said protruding item | line part is an electric wire with a terminal currently formed over the whole width direction of the said connection part. (a) including a wire connection portion, a counterpart connection portion, and a flat plate-like connection portion connecting the wire connection portion and the counterpart connection portion, and an uneven portion is formed on at least a part of the surface of the connection portion. A step of preparing a terminal and an electric wire in which an exposed core portion of the end portion is connected to the electric wire connection portion;
(b) a step of covering a heat shrinkable tube so as to cover the connection portion between the electric wire and the electric wire connection portion and the uneven portion;
(c) a step of disposing an adhesive between the connection portion between the electric wire and the electric wire connection portion, and the heat shrinkable tube;
(d) shrinking the heat-shrinkable tube by heating, and between the heat-shrinkable tube and the connecting portion between the electric wire and the electric-wire connecting portion, and between the uneven portion and the heat-shrinkable tube, Arranging the adhesive; and
The manufacturing method of the electric wire with a terminal provided with.

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