JP2021015763A - Crimping terminal - Google Patents

Abstract

To provide a crimping terminal in which the tips of a pair of crimping pieces surely bite into a core wire, the conduction resistance with an electronic wire is low, and, the adhesive force is strong.SOLUTION: A crimping terminal 10 includes a core wire crimping portion 16 that includes a base portion 16a and a pair of crimping piece portions 16b extending from both side ends of the base portion 16a, and crimps a core wire 1 composed of a plurality of strands 1a of an electric wire W, and a pair of meshing portions 19 in which the pair of crimping piece portions 16b are arranged on both facing surfaces of the parts that are crimped inward in a curved shape and overlap each other, and whose surfaces perpendicular to the biting direction into a core wire 1 are meshing surfaces with each other.SELECTED DRAWING: Figure 2

Description

The present invention relates to a crimp terminal connected to an electric wire.

Conventional examples of crimp terminals that are crimped to an electric wire are shown in FIGS. 5 to 9 (see Patent Document 1). In FIGS. 5 to 7, the electric wire W connecting the crimp terminal 110 is composed of a core wire 101 composed of a plurality of strands 101a and an insulating outer skin 102 covering the outer periphery of the core wire 101. On the tip end side of the electric wire W, the insulating outer skin 102 is removed to expose the core wire 101.

The crimp terminal 110 has a mating terminal connecting portion 111 and an electric wire connecting portion 115. The electric wire connecting portion 115 has a core wire crimping portion 116 and an outer skin crimping portion 117. The core wire crimping portion 116 has a base portion 116a and a pair of crimping piece portions 116b extending from both sides of the base portion 116a. Engagement portions 120 are provided on the outer surfaces of the tip portions of the pair of crimping piece portions 116b, respectively.

The exodermis crimping portion 117 has a base portion 117a and a pair of crimping piece portions 117b extending from both sides of the base portion 117a.

The crimp terminal 110 crimps and crimps the core wire 101 exposed by the core wire crimping portion 116, and crimps and crimps the insulating outer skin 102 by the outer skin crimping portion 117.

The crimping and crimping of the core wire crimping portion 116 is performed by the crimping jig 140. As shown in FIG. 8, the crimping jig 140 has an anvil 141 and a crimper 142 having a crimping groove 142a having a final crimping outer peripheral shape on the crimping tip side. The core wire crimping portion 116 is placed on the upper surface of the anvil 141, and the crimper 142 is lowered from above. Then, the anvil 141 and the crimper 142 press the base portion 116a and the pair of crimping pieces 116b and plastically deform so as to wrap around the outer circumference of the core wire 101, and the tips of the pair of crimping pieces 116b are inside the core wire 1. (See Fig. 7).

Here, since the meshing portions 120 are provided on both facing surfaces of the pair of crimping piece portions 116b that overlap each other, the meshing portions 120 mesh with each other and the core wires are fixed to each other. It digs into 101. Therefore, the pair of crimping piece portions 116b are integrated and bite into the core wire 101 together. As a result, a stable conduction resistance can be obtained.

JP-A-2010-61944

However, as shown in FIG. 9, in the crimping and crimping process, the pair of meshing portions 120 mesh with the surfaces 120a in the oblique direction with respect to the biting direction T into the core wire 101. Therefore, the crimping and crimping force (energy) is dispersed in the core wire 101 other than the biting direction T and is not concentrated in the biting direction T, so that the core wire 101 may not be reliably bitten or the biting may be shallow. When the crimping piece portion 116b is crimped without biting into the core wire 101 or with a shallow bite, the contact area between the core wire crimping portion 116 and the core wire 1 is small, so that the conduction resistance is increased, and the conduction resistance is increased. There arises a problem that the fixing force between the core wire crimping portion 116 and the core wire 1 is weakened.

Therefore, the present invention has been made to solve the above-mentioned problems, and the tips of the pair of crimping pieces surely bite into the core wire, the conduction resistance with the electric wire is low, and the fixing force is strong. It is intended to provide a strong crimp terminal.

The present invention has a base portion and a pair of crimping pieces extending from both end ends of the base portion, and a core wire crimping portion for crimping a core wire composed of a plurality of strands of an electric wire, and a pair of the crimping portions. One part is provided on both abutting surfaces of the parts that are in a state of being crimped inward in a curved shape and overlap each other, and the surfaces in the direction perpendicular to the biting direction into the core wire mesh with each other. It is a crimp terminal characterized by having a pair of meshing portions.

According to the present invention, in the crimping process of the core wire crimping portion, the surfaces of the pair of meshing portions are engaged with each other in the direction perpendicular to the biting direction of the core wire, so that the crimping force is in the biting direction of the core wire. concentrate. From the above, the pair of crimping pieces surely bite into the core wire, the conduction resistance with the electric wire is low, and the fixing force is strong.

An embodiment of the present invention is shown, (a) is a perspective view before crimping an electric wire to a crimp terminal, and (b) is a sectional view taken along line AA of (a). An embodiment of the present invention is shown, where (a) is a side view of a crimp terminal to which an electric wire is crimped, and (b) is a sectional view taken along line BB of (a). An embodiment of the present invention is shown, and FIGS. (A) to (C) are cross-sectional views showing a crimping process. It is a figure which shows one Embodiment of this invention and explains the direction of the force which the crimping crimping force acts on the crimping piece portion through the meshing portion. A conventional example is shown, and it is a perspective view before crimping an electric wire to a crimp terminal. FIG. 5 is a cross-sectional view taken along the line CC of FIG. 5 showing a conventional example. It is sectional drawing of the core wire crimping part in the state which crimped the core wire which shows the conventional example. It is a figure which shows the conventional example and explains the crimping operation with a crimping jig. It is a figure which shows the conventional example and explains the direction of the force which a crimping force acts on a crimping piece portion through a meshing portion.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 to 4 show an embodiment of the present invention. As shown in FIGS. 1 and 2, the electric wire W is composed of a core wire 1 composed of a plurality of strands 1a and an insulating outer skin 2 covering the outer periphery of the core wire 1. On the tip end side of the electric wire W, the insulating outer skin 2 is removed to expose the core wire 1. The core wire 1 is made of a large number of strands 1a made of aluminum or an aluminum alloy (hereinafter, made of aluminum), and a large number of strands 1a are twisted together. That is, the electric wire W is an aluminum electric wire.

The crimp terminal 10 is made of, for example, a copper alloy, and is formed by bending a plate cut into a predetermined shape. The crimp terminal 10 has a mating terminal connecting portion 11 and an electric wire connecting portion 15. The electric wire connecting portion 15 has a core wire crimping portion 16 and an outer skin crimping portion 17. The core wire crimping portion 16 has a base portion 16a and a pair of crimping piece portions 16b extending from both side ends of the base portion 16a. As shown in FIG. 1 and the like, the pair of crimping piece portions 16b are in a state before crimping the electric wire W, and each has a straight shape extending diagonally outward as the distance between them gradually increases toward the tip. ..

A meshing portion 19 is provided at each of the tip portions 18 of the pair of crimping piece portions 16b. As shown in FIG. 1B and the like, the meshing portions 19 are in a state before crimping the core wire 1 and are provided on the outer surfaces of the meshing portions 19, but the pair of crimping piece portions 16b are directed inward. It is arranged on both contact surfaces of the portions that are in a curvedly crimped state (FIGS. 2B, 3B, etc.) and overlap each other.

As shown in detail in FIG. 4, each meshing portion 19 has a triangular cross section from a surface 19a perpendicular to the biting direction T into the core wire 1 and a surface 19b oblique to the biting direction T into the core wire 1. is there. Then, at the time of meshing, the surfaces 19a in the vertical direction and the surfaces 19b in the oblique direction mesh with each other.

The exodermis crimping portion 17 has a base portion 17a and a pair of crimping piece portions 17b extending from both sides of the base portion 17a.

In the crimp terminal 10, the core wire 1 exposed by the core wire crimping portion 16 is crimped and crimped, and the insulating outer skin 2 is crimped and crimped by the outer skin crimping portion 17.

The crimp terminal 10 is crimped by the crimping jig 20. As shown in FIG. 3, the crimping jig 20 has an anvil 21 and a crimper 22 that moves up and down with respect to the anvil 21. The upper surface 21a of the anvil 21 is formed in the final crimping outer peripheral shape of the core wire crimping portion 16 mainly on the base portion 16a. A crimping groove 22a is formed on the lower side of the crimper 22. The crimping groove 22a has the final crimping outer peripheral shape of the pair of crimping piece portions 16b of the core wire crimping portion 16.

Next, the crimping process of the core wire crimping portion 16 using the crimping jig 20 will be described. As shown in FIG. 3A, the core wire crimping portion 16 is placed on the upper surface 21a of the anvil 21. Next, the crimper 22 is lowered from above. Then, the crimper 22 presses the pair of crimping pieces 16b, and the pair of crimping pieces 16b having a shape that opens outward toward the tip are plastically deformed in a direction that narrows the distance between them. When the crimper 22 is further lowered, as shown in FIG. 3B, the anvil 21 and the crimper 22 are plastically deformed so as to press the base portion 16a and the pair of crimping piece portions 16b and wrap around the outer circumference of the core wire 1. At the same time, the tip surface of the tip portion 18 of each crimping piece portion 16b comes into contact with the core wire 1. The tip surface of the tip portion 18 of each crimping piece portion 16b abuts in a direction substantially perpendicular to the core wire 1 (a direction toward the substantially center of the core wire 1). Further, the meshing portions 19 of the tip portions 18 of the pair of crimping piece portions 16b mesh with each other.

When the crimper 22 is further lowered, the anvil 21 and the crimper 22 press the base portion 16a and the pair of crimping pieces 16b and plastically deform so as to wrap the outer circumference of the core wire 1 while compressing the base portion 16a and the pair of crimping pieces. The tip 18 of 16b gradually bites into the core wire 1.

Here, in the pair of meshing portions 19, the surfaces 19a in the direction perpendicular to the biting direction T into the core wire 1 mesh with each other, so that the crimping force F (shown in FIG. 3B) bites into the core wire 1. It concentrates in the biting direction without dispersing in directions other than the direction T.

Then, at the final crimping position by the anvil 21 and the crimper 22, as shown in FIG. 3C, the tip 18 of the pair of crimping pieces 16b is sufficiently bitten into the core wire 1 in the linear direction. It is tightened and crimped.

As described above, the crimp terminal 10 has a base portion 16a and a pair of crimping piece portions 16b extending from both side ends of the base portion 16a, and has a core wire 1 composed of a plurality of strands 1a of the electric wire W. The core wire crimping portion 16 to be crimped and the pair of crimping piece portions 16b are arranged on both opposite surfaces of the portions that are curved inward and overlap each other, and the direction of biting into the core wire 1. It is provided with a pair of meshing portions 19 having surfaces 19a in the direction perpendicular to T as meshing surfaces with each other.

Therefore, as described above, in the crimping process of the core wire crimping portion 16, the crimping force F is concentrated in the biting direction T of the core wire 1. From the above, the pair of crimping piece portions 16b surely bite into the core wire, the conduction resistance with the electric wire W is low, and the fixing force is strong.

Each meshing portion 19 has a triangular cross section from a surface 19a in the direction perpendicular to the biting direction into the core wire 1 and a surface 19b oblique to the biting direction T into the core wire 1, and both vertical surfaces 19a. The surfaces 19b in the diagonal direction mesh with each other. Therefore, the meshing portion 19 has a simple structure and is easy to process.

In the embodiment, the core wire 1 is made of aluminum, but the present invention can be applied to a core wire 1 other than aluminum (for example, made of copper alloy).

W Electric wire 1 Core wire 1a Wire 10 Crimping terminal 16 Core wire crimping part 16a Base part 16b Clamping piece part 18 Tip part 18a Tapered surface

Claims (2)

A core wire crimping portion that has a base portion and a pair of crimping pieces extending from both ends of the base portion and crimps a core wire composed of a plurality of strands of an electric wire.
The pair of crimping pieces are arranged on both opposite surfaces of the portions that are crimped inward in a curved shape and overlap each other, and the surfaces perpendicular to the biting direction into the core wire are arranged. A crimp terminal characterized by having a pair of meshing portions having meshing surfaces with each other. The crimp terminal according to claim 1.
Each of the meshing portions has a triangular cross section from a surface perpendicular to the direction of biting into the core wire and a surface oblique to the direction of biting into the core wire, and both of the surfaces in the vertical direction and the above. A crimp terminal characterized in that the surfaces in the diagonal direction mesh with each other.

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