JP2015095406A - Terminal waterproof structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal waterproof structure capable of stabilizing waterproof performance and anti-corrosion performance while enabling setting of an inexpensive material by expanding a range of resin material selection of a mold resin.SOLUTION: A terminal waterproof structure includes: a terminal 13 having an electric connection part 15 and a wire connection part 20 connected to the electric connection part 15; a covered wire 11 whose terminal is electrically connected to the wire connection part 20; a flexible extension part 21 connected to the wire connection part 20 and extending along the covered wire 11; and a mold resin part 39 from which the covered wire 11 is pulled out by molding the wire connection part 20 connected to the terminal of the covered wire 11 and the flexible extension part 21.

Description

  The present invention relates to a waterproof terminal structure.

  Conventionally, as an example of a terminal fitting connected to a terminal portion of an electric wire, for example, a grounding terminal fitting is known. This grounding terminal fitting includes a core wire crimping part connected to the terminal part of the electric wire and an electrical contact part in which a bolt hole is formed, and is used by being bolted to a vehicle body panel. However, in such a structure, when water droplets adhere to the core crimping portion due to rain, vehicle washing, or the like, the water droplets may enter the coating from the terminal portion of the electric wire due to capillary action. Then, the terminal waterproof structure which molds the terminal part of an electric wire with mold resin and waterproofs is known (for example, refer to patent documents 1 and 2).

  For example, in the electric wire with a molded connector shown in FIG. 6, the core wire 501 is exposed from the end of the covered electric wire 505 in which the core wire 501 is covered with the insulating coating 503, and the terminal 507 is connected to the core wire 501. Then, the electrical contact portion 509 of the terminal 507 is exposed, and the wire connection portion including the barrel 511 of the terminal 507 and the end of the covered wire 505 connected to the terminal 507 are molded with the mold resin 513 so that the molded connector is integrated. Is provided. Concave and convex portions 515 are provided in advance on the surface of the insulating coating 503 of the covered electric wire 505, and the joint surface between the surface of the insulating coating 503 and the mold connector has an uneven fitting shape. Thereby, the adhesiveness of the surface of the insulation coating 503 and the joint surface of the mold connector is enhanced by the rubber elasticity of the insulation coating 503 on which the uneven portion 515 is formed.

  In addition, the waterproof structure of the wire end portion shown in FIG. 7 has a low rigidity at the front side of the portion corresponding to the insulating coating 503 of the covered wire 505 (the portion on the side where the covered wire 505 is led out) in the mold resin 513. A portion 517 is formed. The low-rigidity portion 517 is a portion in which the rigidity is lowered by making it thinner over the entire circumference than the thickness of the main body portion 519 in the mold resin 513. The rear end edge portion (the end edge portion on the side where the covered electric wire 505 is led out) of the mold resin 513 is left without being thinned, and the high-rigidity portion 521 having higher rigidity than the low-rigidity portion 517 Has been. Accordingly, when the covered electric wire 505 is swung at the same angle, the bending angle of the covered electric wire 505 at the position of the rear end surface of the mold resin 513 (the end surface 523 on the side where the covered electric wire 505 is led out) is lower than that of the mold resin 513. Compared with the case where there is no rigid portion 517, it is smaller, and it is avoided that the coating is broken or a gap is generated.

JP 2010-97704 A JP 2007-134134 A

However, the terminal waterproof structure in which the terminal of the covered electric wire 505 is molded with the mold resin 513 as described above, the load is directly applied to the mold portion, such as when the electric wire portion is greatly bent for mounting on the vehicle, It is considered that peeling occurs between the covered electric wire 505 and the mold resin 513.
Further, for example, as shown in FIG. 8, when the covered electric wire 505 is lifted upward and bent greatly, stress concentrates on the resin portion covering the terminal end portion 525, and in the worst case, cracks occur in the mold resin 513. 527 or the like occurs. In order to prevent this, it is necessary to increase the elongation (rubber elasticity referred to in Patent Document 1) and strength of the resin material of the mold resin, but an expensive resin material is required. Moreover, when forming the low rigidity part of patent document 2, an expensive resin material with high extensibility is required. Furthermore, a structure that allows bending by providing a low-rigidity part has a disadvantage that fatigue tends to occur under use conditions in which engine vibration or the like is applied over a long period of time.

  The present invention has been made in view of the above situation, and its purpose is to expand the range of resin material selection of the mold resin, and to enable the setting of inexpensive materials, while allowing the waterproof performance and anticorrosion performance to be stabilized. It is to provide a waterproof structure.

The above object of the present invention is achieved by the following configuration.
(1) A terminal having an electrical contact portion and a wire connection portion connected to the electrical contact portion, a covered wire whose end is electrically connected to the wire connection portion, and a wire connection portion connected to the wire connection portion A flexible extension extending along the covered wire, a wire connecting portion to which the end of the covered wire is connected, and a mold resin portion from which the covered wire is drawn by molding the flexible extension And a terminal waterproof structure.

According to the terminal waterproof structure having the above configuration (1), the flexible extension portion is further extended along the covered electric wire from the electric wire connecting portion of the terminal which has conventionally been the terminal end portion.
Therefore, when the covered electric wire drawn from the mold resin portion is bent, the bending load applied to the mold resin portion is supported by the flexible extension portion. That is, the bending load directly applied to the mold resin portion is suppressed by the flexible extension portion being bent and deformed. Therefore, the coated electric wire and the mold resin portion are hardly separated, and the mold resin portion is not cracked.
Since the bending load applied to the mold resin portion is suppressed by the flexible extension portion, it is not necessary to increase the elongation / strength of the resin material of the mold resin portion, and an inexpensive resin material can be used.

(2) The terminal waterproof structure having the configuration of (1), wherein the flexible extension portion protrudes from the mold resin portion, and the covered electric wire is caulked to a protruding tip portion protruding from the mold resin portion. A waterproof terminal structure characterized in that an external caulking portion to be fixed is formed.

According to the terminal waterproof structure having the configuration (2), the flexible extension portion protrudes from the mold resin portion along the covered electric wire. The covered electric wire drawn out from the mold resin portion is integrally fixed to the flexible extension portion by an external caulking portion formed at the protruding tip portion. That is, the waterproof treatment by the mold resin portion is completed between the electric wire connecting portion and the external caulking portion.
Therefore, when the covered electric wire drawn out from the mold resin portion is bent, the bending force is supported by the external caulking portion of the flexible extension portion. As a result, a bending force is not directly applied to the mold resin portion. Since the external caulking part is caulking and fixing the covered electric wire, it can support the force generated by bending in all directions.

(3) The terminal waterproof structure having the configuration of (1) or (2), wherein the flexible extension portion of the portion covered with the mold resin portion is spaced apart from the outer periphery of the covered electric wire. A terminal waterproof structure in which a concave portion is formed to wrap around the mold resin portion.

  According to the terminal waterproof structure having the above configuration (3), the recess formed in the flexible extension portion of the portion covered with the mold resin portion is separated from the outer periphery of the covered electric wire. This separation ensures a resin injection space between the covered electric wire and the flexible extension. As the mold resin wraps around the resin injection space, the mold resin portion is continuously formed in the outer peripheral direction of the covered electric wire. Thus, the molded resin portion is not divided in the outer peripheral direction of the covered electric wire by the covered electric wire coming into contact with the flexible extension portion, and the terminal is surely molded by the molded resin portion.

(4) The terminal waterproof structure configured as described in (3) above, wherein an outer surface of a portion of the flexible extension portion where the concave portion is formed is exposed on a surface of the mold resin portion, and the flexibility A waterproof terminal structure characterized in that a resin confirmation hole is formed in a portion of the extension portion where the recess is formed.

  According to the terminal waterproof structure having the configuration of the above (4), the outer surface of the flexible extension portion of the portion where the recess is formed is exposed on the surface of the mold resin portion, and the resin confirmation hole is formed on the outer surface of the exposed portion. Is provided. The mold resin injected into the resin injection space formed by the concave portion can be visually confirmed or confirmed with a jig or the like through the resin confirmation hole. That is, it can be easily confirmed whether or not the mold resin is reliably injected into the resin injection space of the recess.

  According to the terminal waterproof structure according to the present invention, it is possible to stabilize the waterproof performance and the anticorrosion performance while expanding the range of resin material selection of the mold resin and enabling the setting of an inexpensive material.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

(A) is the side view which notched a part of terminal with the terminal waterproof structure which concerns on 1st Embodiment of this invention, (b) is a top view of the terminal shown to (a). (A) is the side view which notched a part of terminal with the terminal waterproof structure which concerns on 2nd Embodiment of this invention, (b) is a top view of the terminal shown to (a). (A) is the side view which notched a part of terminal with the terminal waterproof structure which concerns on 3rd Embodiment of this invention, (b) is AA sectional drawing in (a). It is a cross-sectional view in the flexible extension part of the terminal concerning a comparative example. It is the side view which notched a part of terminal provided with the terminal waterproofing structure concerning a 4th embodiment of the present invention. It is sectional drawing which notched some electric wires with the conventional mold connector. It is sectional drawing which notched a part in the waterproof structure of the conventional electric wire terminal part. It is operation | movement explanatory drawing at the time of the crack generation | occurrence | production in the conventional terminal waterproof structure.

Embodiments according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the terminal waterproof structure according to the first embodiment of the present invention includes a terminal 13 having an electrical contact portion 15 and a wire connection portion 20 connected to the electrical contact portion 15, and a terminal having a wire connection. A covered electric wire 11 electrically connected to the portion 20, a flexible extension 21 connected to the electric wire connecting portion 20 and extending along the covered electric wire 11, and an electric wire to which the end of the covered electric wire 11 is connected A molding resin portion 39 from which the coated wire 11 is drawn by molding the connecting portion 20 and the flexible extension portion 21;

  The terminal 13 is obtained by bending a metal plate material punched into a predetermined shape, and is an LA terminal having an electrical contact portion 15 fixed to a vehicle body panel (not shown). A bolt hole 23 is formed at the center of the electrical contact portion 15. A crank bending portion 25 is connected to the rear portion of the electrical contact portion 15. The crank bending portion 25 is bent upward at the rear position of the electrical contact portion 15 and then bent backward, and the electric wire connecting portion 20 is formed (continuously provided) at the rear end thereof. .

The electric wire connecting portion 20 includes a core wire crimping portion 17 provided continuously with the electrical contact portion 15 and an insulating coating crimping portion 19 provided continuously with the core wire crimping portion 17.
The core wire crimping portion 17 has a known open barrel shape in which crimping pieces 27 are raised from the left and right side edges at the rear end portion of the crank bending portion 25. The core wire crimping portion 17 is electrically connected to the covered electric wire 11 by tightening the core wire 29 exposed at the terminal portion of the covered electric wire 11. The terminal 13 is fixed by being tightened with a nut through a bolt hole 23 of the electrical contact portion 15 to a stud bolt (not shown) rising from a predetermined position of the vehicle body panel, and is electrically connected to the vehicle body panel.

  The insulation coating caulking part 19 is connected to the side opposite to the electrical contact part 15 of the core wire crimping part 17. The insulation coating crimping portion 19 has a crimping claw 31 for crimping the insulation coating of the coated electric wire 11. The crimping claws 31 are crimped to fix the insulating coating 33 of the covered electric wire 11.

  The flexible extension portion 21 is connected to the insulation coating crimping portion 19 of the electric wire connection portion 20 and extends along the covered electric wire 11. The distal end portion 35 of the flexible extension portion 21 may be disposed in the mold resin portion 39, may be disposed so as to be exposed on the resin surface 37, or may protrude from the mold resin portion 39. When the distal end portion 35 of the flexible extension portion 21 is disposed in the mold resin portion 39, it is preferably disposed close to the resin surface 37. This is to make it difficult for stress to concentrate on the central portion of the mold resin portion 39 when the covered electric wire 11 is bent.

  In the covered electric wire 11, the core wire 29 exposed at the end is crimped to the core wire crimping portion 17 of the wire connecting portion 20. In the covered electric wire 11 in which the core wire 29 is fixed to the core wire crimping portion 17, the insulating coating 33 is further crimped and fixed to the insulating coating crimping portion 19 of the electric wire connecting portion 20.

  The mold resin portion 39 molds the core wire crimping portion 17 and the insulating coating crimping portion 19 of the wire connecting portion 20 to which the covered electric wire 11 is attached, and the flexible extension portion 21. From the mold resin portion 39, the covered electric wire 11 whose end is connected to the terminal 13 is drawn out. The molded resin portion 39 surrounds the connection portion between the covered electric wire 11 and the terminal 13 without a gap, and is configured so that water does not enter the connection portion from the outside.

In the terminal waterproof structure according to the first embodiment, the flexible extension portion 21 further extends along the covered electric wire 11 from the insulation coating crimping portion 19 of the electric wire connecting portion 20 of the terminal 13 which has conventionally been a terminal end portion. It has been extended. Therefore, when the covered electric wire 11 drawn out from the mold resin portion 39 is bent, the bending load applied to the mold resin portion 39 is supported by the flexible extension portion 21.
That is, the bending load directly applied to the mold resin portion 39 is suppressed by the flexible extension portion 21 being bent and deformed. Therefore, the covered electric wire 11 and the mold resin portion 39 are hardly peeled off, and the mold resin portion 39 is not cracked.

As a result, even if water droplets adhere due to rainfall, vehicle washing, or the like, the water droplets do not enter the insulating coating 33 from the terminal portion of the covered electric wire 11 by capillary action.
In particular, by connecting the core wire 29 made of aluminum or an aluminum alloy to the terminal 13 made of copper or a copper alloy, even when it becomes a copper-aluminum contact that easily causes electrolytic corrosion due to a dissimilar metal contact, This dissimilar metal contact portion can be reliably waterproofed by the mold resin portion 39, and good corrosion resistance can be ensured.
Since the bending load applied to the mold resin portion 39 by the flexible extension portion 21 is suppressed, there is no need to increase the elongation / strength of the resin material of the mold resin portion 39, and an inexpensive resin material can be used. .

Next, a terminal waterproof structure according to a second embodiment of the present invention will be described.
In the following embodiments, the same members as those shown in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.
In the terminal waterproof structure according to the second embodiment, the flexible extension 43 of the terminal 41 protrudes from the mold resin part 39 as shown in FIG. Then, an external crimping portion 45 for crimping and fixing the covered electric wire 11 is formed on the protruding tip portion 35A protruding from the mold resin portion 39. The external crimping portion 45 has a crimping claw 31 for crimping the insulating coating 33 of the covered electric wire 11. The crimping claws 31 are crimped to fix the insulating coating 33 of the covered electric wire 11.

According to the terminal waterproof structure according to the second embodiment, the flexible extension portion 43 protrudes from the rear end surface of the mold resin portion 39 along the covered electric wire 11. The covered electric wire 11 drawn out from the rear end surface of the mold resin portion 39 is integrally fixed to the flexible extension portion 43 by an external crimping portion 45 formed at the protruding tip portion 35A. That is, the waterproof treatment by the mold resin portion 39 is completed between the insulating coating crimping portion 19 and the external crimping portion 45 of the wire connection portion 20. At this time, the rear end surface of the mold resin portion 39 is a region between the rear end of the insulating coating crimp portion 19 and the rear end of the external crimp portion 45 and does not protrude from the rear end of the external crimp portion 45. Any position is acceptable.
Therefore, when the covered electric wire 11 drawn out from the mold resin portion 39 is bent, the bending force is supported by the external caulking portion 45 of the flexible extension portion 43. As a result, the bending force is not directly applied to the mold resin portion 39. Since the external crimping part 45 crimps and fixes the covered electric wire 11, it can support the force generated by bending in all directions.

Next, the waterproof terminal structure according to the third embodiment will be described.
In the terminal waterproof structure according to the third embodiment, as shown in FIG. 3, a recess 51 is formed in the flexible extension 49 of the terminal 47. The recess 51 is formed in the portion 53 of the flexible extension 49 covered with the mold resin portion 39. The recess 51 is separated from the outer periphery of the covered electric wire 11, so that the mold resin portion 39 is wound between the covered electric wire 11 and the flexible extension portion 49 as shown in FIG.

According to the terminal waterproof structure according to the third embodiment, the concave portion 51 formed in the flexible extension portion 49 of the portion 53 covered with the mold resin portion 39 is separated from the outer periphery of the covered electric wire 11. This separation ensures the resin injection space 55 between the covered electric wire 11 and the flexible extension 49. As the mold resin wraps around the resin injection space 55, the mold resin portion 39 is continuously formed in the outer peripheral direction of the covered electric wire 11. At this time, the rear end surface of the mold resin portion 39 is located between the resin injection space 55 and the rear end of the external crimping portion 45 and any position as long as it does not protrude from the rear end of the external crimping portion 45. But you can.
Thereby, like the flexible extension part 49A of the terminal 47A according to the comparative example shown in FIG. 4, the covered electric wire 11 is divided in the circumferential direction by contacting the part 53A covered with the mold resin part 39. As a result, the terminal 47 according to the third embodiment is surely molded with the covered electric wire 11 by the mold resin portion 39.

Next, the waterproof terminal structure according to the fourth embodiment will be described.
In the terminal waterproof structure according to the fourth embodiment, as shown in FIG. 5, the outer surface 61 of the portion 53 where the recess 51 is formed in the flexible extension portion 49 of the terminal 57 is the resin surface of the mold resin portion 39 ( A resin confirmation hole 59 is formed in a portion 53 of the flexible extended portion 49 where the concave portion 51 is formed. That is, the resin confirmation hole 59 is visible from the outside of the mold resin portion 39. At this time, the rear end surface of the mold resin portion 39 is located between the resin confirmation hole 59 and the rear end of the external crimping portion 45 and any position as long as it does not protrude from the rear end of the external crimping portion 45. But you can.

  According to the terminal waterproof structure according to the fourth embodiment, the outer surface 61 of the flexible extension portion 49 of the portion 53 where the recess 51 is formed is exposed to the resin surface 37 of the mold resin portion 30 and exposed. A resin confirmation hole 59 is provided on the outer side surface 61 of 53. The mold resin injected into the resin injection space 55 formed by the recess 51 can be visually confirmed by the resin confirmation hole 59 or confirmed by a jig or the like. That is, it can be easily confirmed whether or not the mold resin is reliably injected into the resin injection space 55 of the recess 51.

Here, the characteristics of the embodiment of the terminal waterproof structure according to the present invention described above will be briefly summarized below.
[1] A terminal 13 having an electrical contact portion 15 and a wire connection portion 20 connected to the electrical contact portion 15, a covered wire 11 whose end is electrically connected to the wire connection portion 20, and the wire A flexible extension 21 connected to the connecting portion 20 and extending along the covered electric wire 11, and the electric wire connecting portion 20 and the flexible extending portion 21 to which the end of the covered electric wire 11 is connected. And a molded resin portion 39 from which the covered electric wire 11 is drawn out.
[2] The terminal waterproof structure configured as described in [1] above, wherein the flexible extension portion 43 protrudes from the mold resin portion 39, and the protruding tip portion 35A protruding from the mold resin portion 39 has the covering. An external crimping part 45 for crimping and fixing the electric wire 11 is formed.
[3] The terminal waterproof structure configured as described in [1] or [2] above, wherein the flexible extension portion 49 of the portion 53 covered with the mold resin portion 39 has an outer periphery of the covered electric wire 11. A terminal waterproofing structure is characterized in that a recess 51 is formed to wrap around the mold resin portion 39 apart from the mold resin portion 39.
[4] The terminal waterproof structure configured as described in [3] above, wherein the outer surface 61 of the portion 53 where the concave portion 51 is formed in the flexible extension portion 49 is a surface (resin surface) of the mold resin portion 39. 37, a resin waterproof hole 59 is formed in a portion 53 of the flexible extension 49 where the recess 51 is formed.

Therefore, according to the terminal waterproof structure according to this embodiment, the waterproof performance and the anticorrosion performance can be stabilized while expanding the range of resin material selection of the mold resin and enabling the setting of an inexpensive material.
In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

DESCRIPTION OF SYMBOLS 11 ... Covered electric wire 15 ... Electric contact part 13 ... Terminal 17 ... Core wire crimping part 19 ... Insulation coating crimping part 20 ... Electric wire connection part 21 ... Flexible extension part 29 ... Core wire 33 ... Insulation coating 35 ... Tip part 35A ... Projection Tip 37 ... resin surface (surface)
39 ... Mold resin part 45 ... External caulking part 51 ... Recess 53 ... Part 59 ... Resin confirmation hole 61 ... Outer surface

Claims (4)

A terminal having an electrical contact part and a wire connection part connected to the electrical contact part;
A covered electric wire whose end is electrically connected to the electric wire connecting portion;
A flexible extension that is connected to the wire connection portion and extends along the covered wire; and
Molded resin part from which the coated electric wire is drawn out by molding the electric wire connecting part to which the end of the covered electric wire is connected and the flexible extension part,
A terminal waterproof structure comprising: The terminal waterproof structure according to claim 1,
The flexible extension portion protrudes from the mold resin portion, and an external crimping portion for crimping and fixing the covered electric wire is formed at a protruding tip portion protruding from the mold resin portion. Waterproof structure. The terminal waterproof structure according to claim 1 or 2,
The waterproof terminal structure is characterized in that the flexible extension portion of the portion covered with the mold resin portion is formed with a recess which is spaced from the outer periphery of the covered electric wire and turns around the mold resin portion. . The terminal waterproof structure according to claim 3,
An outer surface of a portion of the flexible extension portion where the recess is formed is exposed on the surface of the mold resin portion, and a resin confirmation hole is formed in the portion of the flexible extension portion where the recess is formed. Terminal waterproof structure characterized by being provided.

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