JP5720609B2 - Protective cap with crimp terminal and method for forming terminal splice portion using the protective cap - Google Patents

Description

  The present invention relates to a protective cap with a crimp terminal and a method of forming a terminal splice portion using the protective cap, and more particularly, to provide a splice portion at an electric wire terminal arranged in a vehicle and protect the splice portion.

Conventionally, as a method of connecting a circuit by connecting an electric wire and branching a circuit, first, as described in JP-A-11-74005, the insulation coating is peeled off at an intermediate position of the electric wire to expose the core wire, There is a method in which after the core wire is passed through a joint crimp terminal, the joint terminal is crimped and crimped, and an insulation sheet is wound around the crimp portion to protect the coating.
Secondly, there is a method in which a terminal is connected to each wire end, the terminal is inserted into a joint connector, and connected to a joint bus bar in the joint connector.
Third, the insulation coating is peeled off at the end of the electric wire to expose the core wire, and a plurality of core wire exposed portions are stacked to perform ultrasonic welding or resistance welding to form a terminal concentrated splice. There is a method of protecting by inserting into a resin cap.

  A structure shown in FIGS. 9A and 9B is provided in Japanese Patent Application Laid-Open No. 11-67287 as a structure for grounding and waterproofing the terminal concentration splice. The core wire exposed portion 101 of the end of the electric wire 100 is crimped and connected to the crimp portion 111 of the crimp terminal 110 with the ground terminal, the crimp portion 111 is inserted into the protective cap 120, and the ground fixing portion 112 is inserted from the opening end of the protective cap 120. The seal cap 130 is filled in the protective cap 120 so as to protrude outward.

Japanese Patent Application Laid-Open No. 11-74005 Japanese Patent Laid-Open No. 11-67287

In the method of splicing core wires using the first joint crimping terminal, manual work is required to protect the insulation by wrapping a resin sheet around the outer periphery of the splice, and the finishing accuracy tends to vary depending on the skill level of the work. There's a problem.
In the method using the second joint connector, there is a problem that the number of parts and the number of work are increased and the cost tends to increase.
In the method of forming the terminal concentrated splice of the third terminal and accommodating it in the protective cap, equipment cost is required for ultrasonic welding or resistance welding, and it can be performed in-line continuously with the accommodating operation in the protective cap. There is no problem.

  The present invention has been made in view of the above problems, and it is an object of the present invention to be able to form a splice in a simple and reliable manner at a low cost and to protect the formed splice from insulation.

In order to solve the above-mentioned problem, the present invention has a protective cap made of a resin or rubber molded product that has a bottom portion on one end side of the cylindrical portion and has an opening on the other end side, and accommodates the wire terminal splice portion,
It consists of a crimp terminal that inserts a core wire exposed part from which the insulation coating of a plurality of wire terminals has been peeled off and crimps it,
One end side of the crimp terminal is fixed by insert molding to the bottom part, and is attached in advance in the cylindrical part except for the fixing part on the one end side,
The core terminal exposed portion of the electric wire terminal is inserted into and crimped to the crimp terminal exposed by turning the tube portion upside down, and the crimped terminal is covered by returning the tube portion folded back after crimping. We provide protective caps with crimp terminals.

As described above, in the present invention, the core wire exposed portions provided on a plurality of electric wires are crimped with a crimp terminal, and the splice is insulated and protected with a protective cap. Splice connection with the crimp terminal and insulation with the protective cap A protective cap with a crimp terminal having both functions of protection is provided.
When the protective cap with a crimp terminal is used, a splice is formed by crimping an electric wire with a crimp terminal, so that the connection reliability can be improved and the insulating treatment only returns the cylindrical portion of the protective cap. There is an advantage that the number of work steps is reduced.

  When it is necessary to connect the terminal splice to the ground, the crimp terminal is a ground crimp terminal in which a ground fixing portion provided with a bolt hole is further projected from one end in the length direction to be insert-molded at the bottom of the protective cap. The ground fixing portion protrudes outward from the bottom of the protective cap.

  When a large number of electric wires are subjected to terminal concentration splicing, the electric wires to be subjected to terminal concentration splicing are electric wires of an earth circuit, the terminal concentration splicing portion is connected to an earth terminal, and the earth terminal is bolted to a vehicle body panel to be grounded. There are many cases. Therefore, if the grounding fixing portion is provided integrally with the crimp terminal fixed and attached in advance to the protective cap, there is an advantage that it is not necessary to separately connect to the grounding terminal, and the ground connection work can be easily performed.

The crimping part of the crimping terminal is an endless cylindrical shape with a perfect circular cross section, and the central part sandwiched between both sides in the length direction of the cylindrical part is crimped and crimped and flattened. Is preferred.
In addition, although the part crimped | compressed is good also as a barrel shape similar to an intermediate | middle crimp terminal, since the direction of the crimp terminal at the time of crimping crimping will be designated, it will require work work. Therefore, the endless cylindrical shape having a perfect cross section as described above has an advantage that the direction of the crimp terminal at the time of caulking and crimping is not specified and there is no directionality, so that the operation is simplified.
In the case of the cylindrical shape, one end in the length direction of the cylindrical portion is insert-molded to the bottom portion of the protective cap. When the crimping portion is a barrel, it is preferable to project a flat insert mold portion from one end in the length direction of the barrel.

Moreover, this invention provides the formation method of the terminal splice using the said protective cap with a crimp terminal. The method
Turn over the cylindrical part of the protective cap and expose the crimp terminal to the outside,
The core wire exposed by peeling the insulation coating of a plurality of wire ends is focused and inserted into the crimp terminal,
Then, crimping the crimp terminal with a jig, crimping the core wires and the core wire and the crimp terminal, and electrically connecting to form a terminal splice,
Thereafter, the tubular portion of the inverted protective cap is returned to its original position to cover the crimp terminal and to insulate and protect the terminal splice.

When it is necessary to make it waterproof, the tubular portion of the inverted protective cap is returned to its original position and the crimp terminal is covered, and then the protective cap is filled with a water-stopping agent.
When waterproofing is used by filling with a waterproofing agent, the crimping terminal accommodated in the protective cap may have a through hole for the waterproofing agent between the crimped portion and the insert molded portion. preferable.

  Furthermore, the present invention provides a protective structure for a terminal splice protected by the protective cap.

  As described above, the protective cap with a crimp terminal according to the present invention is formed by insert-molding the crimp terminal to form a protective cap, and crimping the core wire exposed portion of the electric wire to form a splice, and the formed splice. Since the protective cap for insulation protection is provided integrally in advance, the crimping process and the insulation protection process can be performed continuously with one component, the work process and the number of parts can be reduced, and the electrical connection accuracy and insulation can be reduced. Protection accuracy can be increased.

The protection cap with a crimp terminal of a 1st embodiment of the present invention is shown, (A) is a sectional view and (B) is an exploded perspective view. It is explanatory drawing which shows the electric wire terminal splice formed using the protective cap with a crimp terminal of the said 1st Embodiment. (A)-(D) is drawing which shows the splice formation process of the electric wire using the said protective cap with a crimp terminal. The protection cap with a crimp terminal of 2nd Embodiment is shown, (A) is sectional drawing, (B) is a perspective view of a ground crimp terminal. It is explanatory drawing which shows the electric wire terminal splice formed using the protective cap with a crimp terminal of the said 2nd Embodiment. It is drawing which shows the splice formation process of 2nd Embodiment. It is sectional drawing which shows 3rd Embodiment. It is drawing which shows the modification of 3rd Embodiment. (A) (B) is drawing which shows a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment.

  As shown in FIGS. 1A and 1B, the protective cap 1 with a crimp terminal of the first embodiment is formed by bending a conductive metal plate in advance inside a protective cap 2 made of a resin molded product having flexibility. The crimp terminal 3 formed in this manner is fixed.

The protective cap 2 has a bottom portion 6 on one end side of a cylindrical tube portion 5 and an opening 7 on the other end side. In addition, the tape winding tongue piece with an electric wire is not protrudingly provided from the other end.
The bottom 6 of the protective cap 2 is relatively thick, and an embedded fixing portion 3a at one end in the length direction of the crimp terminal 3 is insert-molded and fixed to the bottom 6 by being embedded. The cylindrical part 5 protruding from the bottom part 6 is thin and excellent in flexibility so that the cylindrical part 5 can be easily turned over.
The protective cap 2 may be formed of polypropylene, polyethylene, nylon, or the like, or may be formed of an elastic elastomer. Furthermore, you may shape | mold with rubber | gum.

  The crimp terminal 3 is formed into an endless cylindrical shape with an open end at both ends in the length direction, and does not have a shape that specifies the caulking direction. One end of the crimp terminal 3 in the axial direction is embedded and fixed to the bottom 6 of the protective cap 2 as described above. The length of the protruding portion 3b protruding from the embedded fixing portion 3a of the bottom portion 6 into the cylindrical portion 5 is shorter than the length of the cylindrical portion 5 of the protective cap 2, and the crimp terminal 3 does not protrude from the opening 7 of the protective cap 2. I am doing so. An annular gap C is provided between the inner peripheral surface of the cylindrical portion 5 of the protective cap 2 and the outer peripheral surface of the protruding portion 3 b of the crimp terminal 3.

  A splice forming method using the protective cap 1 with a crimp terminal provided by molding the protective terminal 2 by insert molding of the crimp terminal 3 will be described below with reference to FIGS.

As shown in FIG. 3 (A), the cylindrical portion 5 of the protective cap 1 with a crimp terminal is turned over and extended from the bottom portion 6 to the opposite side, and the protruding portion 3b of the crimp terminal 3 is exposed to the outside.
Next, as shown in FIG. 3 (B), the core wires 10b that are exposed by peeling off the insulation coating 10a of the terminals of a plurality (three in the drawing) of the electric wires 10 (10-1 to 10-3) are bundled. Then, the crimping terminal 3 is inserted into the protruding portion 3 b from the tip opening 3 h and the tip of the core wire 10 b is abutted against the bottom 6. In this state, the core wire 10 b of the electric wire 10 is completely inserted into the protruding portion 3 b of the crimp terminal 3, and the electric wire covered with the insulating coating 10 a protrudes from the crimp terminal 3.

  Next, as shown in FIG. 3C, the central portion of the protruding portion 3b of the crimp terminal 3 is crimped by a crimping jig (not shown) from the top and bottom as indicated by arrows in the figure. Thereby, the core wire 10b of a some electric wire is crimped | bonded, and the crimp terminal 3 and the core wire 10b are crimped | bonded, and the electric wire terminal concentration splice S is formed. At the time of the caulking operation, the bottom embedded fixing portion 3a of the crimping terminal 3 is firmly fixed to the bottom portion 6, so that it does not come off from the bottom portion 6, and the central portion of the protruding portion 3b is flattened and crimped to the core wire 10b. . At the time of crimping, the crimp terminal 3 has a circular cross section and has no directionality. Therefore, the direction of the crimp terminal 3 with respect to the crimping jig is not specified, and the crimping operation can be easily performed.

Next, as shown in FIG. 3D, the tube portion 5 turned upside down is returned to its original position, and the crimp terminal 3 crimped to the core wire 10 b is accommodated inside the tube portion 5. In this state, the crimp terminal 3 crimped to the core wire 10b is accommodated in the cylindrical portion 5 with one end side embedded and fixed in the bottom portion 6, and the insulation coating 10a portion of the electric wire 10 (10-1 to 10-3) Is pulled out from the protective cap 2 to the outside. Since the electric wire 10 is fixed to the crimp terminal 3 and the crimp terminal 3 is fixed to the protective cap 2, there is no need to tape the electric wire 10 which has been conventionally performed to the protective cap.
That is, the splicing operation is completed by returning the tube portion 5 of the protective cap 2 that has been turned over to the state shown in FIG. The returning operation of the cylindrical portion 5 is a simple operation, and it is preferable to provide equipment that can automatically perform the returning operation continuously with the crimping and crimping operation.
Note that FIG. 2 is a perspective view of the crimp terminal 3 in which the protective cap is broken and the inner splice S is crimped.

  As described above, in order to form splices for a plurality of wire ends, the core wire exposed portion is inserted into the crimping portion and crimped with a crimping jig, and ultrasonic welding or resistance welding is not used. High welding equipment can be eliminated. In addition, it is only necessary to return the cylindrical portion of the protective cap after the core wire exposed portion is crimped to the crimping portion, so that the fixing work between the electric wire and the protective cap is unnecessary, and the number of work can be reduced and the working cost can be reduced.

4 to 6 show a second embodiment.
In the protective cap 20 with a crimp terminal of the second embodiment, the crimp terminal is different from the crimp terminal 3 of the first embodiment and is used as a ground crimp terminal 21. Other configurations including the protective cap 2 are the same as those of the first embodiment, and the same reference numerals are given and description thereof is omitted.

  The ground crimping terminal 21 includes a cylindrical crimping part 22 having the same shape as the crimping terminal 3 of the first embodiment, and a ground fixing part 23 projecting in a flat plate shape from the lower side of the tip of the crimping part 22. It has a different shape. One end portion 22a of the crimping portion 22 and a base portion 23a on one end side in the length direction of the ground fixing portion 23 are fixed to the bottom portion 6 of the protective cap 2 by insert molding. A bolt hole 23 h is provided at a substantially central position of the ground fixing portion 23 that protrudes outward from the outer surface of the bottom portion 6 of the protective cap 2.

  The protective cap 20 with a crimp terminal that accommodates and fixes the ground crimp terminal 21 is the same as in the first embodiment. As shown in FIG. 6, the cylindrical portion 5 of the protective cap 2 is turned over and covered with the ground fixing portion 23. The part 22 is exposed. After inserting the core wire exposed portions of the plurality of electric wire ends into the crimp portion 22, the crimp portion 22 is crimped and crimped. Thereafter, the cylindrical portion 5 is returned to the original position, the formation of the terminal splice and the insulation protection work by the protective cap 2 are finished, and the state shown in FIG. 5 is obtained.

  In the second embodiment, since the earth crimping terminal 21 formed integrally with the ground fixing part 23 extending at the tip of the crimping part is insert-molded into the protective cap 2 and integrally molded in advance, It can be easily connected to the body panel or the like without connecting a separate ground terminal.

FIG. 7 shows a third embodiment.
When a terminal splice is formed by collecting a group of electric wires in the engine room and the terminal splice is connected to the ground, the engine room is a flooded area and needs to be waterproof. The crimp terminal of the second embodiment The protective cap 20 is used and the protective cap 2 is filled with a water-stopping agent 30 to be waterproof.

  That is, in the step shown in FIG. 6 of the second embodiment, after the core wire exposed portion of the electric wire end is crimped to form the terminal splice S and the cylindrical portion 5 of the protective cap 2 is returned to the original position, the state shown in FIG. As described above, the bottom 6 of the protective cap 2 is positioned on the lower surface, the opening 7 is disposed at the upper end, and the water-stopping agent 30 is filled from the opening 7. For example, silicone is used as the water stop agent 30. Since the silicone is filled in the protective cap 2 having the bottom 6, the viscosity can be relatively low. Therefore, silicone can be surely permeated into the inside of the ground crimp terminal 21 and the gap between the ground crimp terminal and the cylindrical portion 5 of the protective cap 2, thereby improving the water stop accuracy.

  In addition, although 3rd Embodiment is an example using the protective cap with a crimp terminal which provided the earth | ground fixing | fixed part, when the protective cap with a crimp terminal of 1st Embodiment is arrange | positioned in a flooded area | region, a protective cap You may fill a water-stopper in the inside.

FIG. 8 shows a modification of the third embodiment.
In this modification, the crimping portion 22 of the ground crimping terminal 21 is provided with a through hole 22h through which a waterstop agent flows between the crimped portion 22p and the one end portion 22a that is insert-molded. The water-stopping agent 30 can surely flow into the space between the caulking portion 22p and the bottom portion 6 through the through hole 22h, and the water-stopping performance can be improved.

DESCRIPTION OF SYMBOLS 1 Protective cap with a crimp terminal 2 Protective cap 3 Crimp terminal 5 Cylinder part 6 Bottom part 10 Electric wire 10b Core wire S Splice

Claims (6)

A protective cap made of a resin or rubber molded product that has a bottom portion on one end side of the tube portion and the other end side is an opening, and accommodates the wire terminal splice portion;
It consists of a crimp terminal that inserts a core wire exposed part from which the insulation coating of a plurality of wire terminals has been peeled off and crimps it,
One end side of the crimp terminal is fixed by insert molding to the bottom, and is attached to the inside of the cylinder part with a gap in the inner peripheral surface of the cylinder part except for the fixing part on the one end side,
The core terminal exposed portion of the electric wire terminal is inserted into and crimped to the crimp terminal exposed by turning the tube portion upside down, and the crimped terminal is covered by returning the tube portion folded back after crimping. Protective cap with crimp terminal.   The crimp terminal is a ground crimp terminal in which a ground fixing part provided with a bolt hole is further projected from one end in the length direction of insert molding to the bottom part of the protective cap, and the ground fixing part is formed from the bottom part of the protective cap. The protective cap with a crimp terminal according to claim 1, wherein the protective cap projects outward.   2. The crimped portion of the crimp terminal is a cylindrical shape having a perfectly circular cross section, and a central portion sandwiched between both sides in the length direction of the cylindrical portion is a crimped and flattened portion. Or the protective cap with a crimp terminal of Claim 2. A method for forming a terminal splice using the protective cap with a crimp terminal according to any one of claims 1 to 3,
Turn over the cylindrical part of the protective cap and expose the crimp terminal to the outside,
The core wire exposed by peeling the insulation coating of a plurality of wire ends is focused and inserted into the crimp terminal,
Then, crimping the crimp terminal with a jig, crimping the core wires and the core wire and the crimp terminal, and electrically connecting to form a terminal splice,
Thereafter, the tubular portion of the inverted protective cap is returned to its original position to cover the crimp terminal, and the terminal splice is insulated and protected.   The method for forming a terminal splice according to claim 4, wherein a water-stopper is filled in the protective cap after the tubular portion of the inverted protective cap is returned to its original position and the crimp terminal is covered.   The protection structure of the terminal splice protected by the protective cap of any one of Claims 1 thru | or 3.

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