JPS604382Y2 - terminal fittings - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an improvement in a conductor clamping portion of a terminal fitting.

Conventionally, when crimping and clamping a conductor to a terminal, as shown in Fig. 1, a cylindrical body 1 with a plurality of holes 1j drilled around the entire circumference is mounted in a crimp terminal 2, and then the conductor is inserted. It is crimped.

However, when using this method, if the conductor is an aluminum conductor, the oxide film on the surface of the aluminum conductor is destroyed by the chipping of the cylindrical body 1, and the contact resistance at that part is reduced and the electrical performance is improved, but the cylindrical body The tensile strength between 1 and the crimp terminal 2 is not very good, and since the cylindrical body 1 is used as an interposed part, the workability is poor, and for the same reason, the cost is also high.

This invention focuses on the above-mentioned points, and aims to provide a terminal fitting that has improved electrical performance and tensile strength, and has extremely low contact resistance, especially when connecting aluminum conductive wires.

Examples of this invention will be described below with reference to the drawings.

First, in Figures 2 to 4, A is an electrical contact part that is inserted and fitted into a female terminal or bolted to another conductor using a 66, B is a wire connection part, and this wire connection part B is a conductor clamping part. Part B1 and covering holding part B2 are held together.

The conductive wire holding part a has a folded double structure, and the two folded overlapping pieces 4, 4 folded inward from the substrate part 3 are provided with a plurality of recesses 4a symmetrically at their inner ends, and are overlapped. By carrying it upward, a plurality of curved pieces 4b are provided.

A developed view of this conducting wire clamping mechanism is shown in FIG. 3, with the broken line portions being bent.

In FIG. 2, the electric wire is inserted from the direction of the arrow X, and then the electric wire is caulked and clamped with considerable pressure by the conductor clamping part a, and the sheathing part is clamped by the sheath clamping pin.

FIG. 4 shows a cross section of the part marked by the ■ line after the conductor is clamped by the conductor clamping part B1. Since the curved piece 4b cuts into the conductor 5 to a large extent, in the case of an aluminum conductor with an oxide film, the oxide film is completely destroyed, and the surface area of the conductor 5 in contact with the folded overlapping piece 4 increases greatly. Therefore, the contact resistance is greatly reduced, and the tensile strength is also improved due to the recess 4a at the tip of the folded polymer piece 4.

As described above, this invention has a folded double structure for the conductor holding part of the wire connection part, and a plurality of recesses are symmetrically provided at the inner ends of the two folded overlapping pieces, and the two folded overlapping pieces are overlapped to form a beam in an upward direction. Since a plurality of curved pieces are provided by raising the conductor, when the conductor clamping portion is caulked to the conductor, the conductor receives a pressing force due to the elastic force of the folded overlapping piece, and the plurality of curved pieces bite into the conductor. This gives it strong tensile strength, and the oxide film of the aluminum conductor or the insulating film of the enamelled wire is also destroyed when it is crimped and clamped, making it possible to greatly improve electrical and mechanical performance. can.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional crimp terminal, Fig. 2 is a perspective view of a terminal fitting showing an embodiment of this invention, Fig. 3 is a developed view of the conductor clamping part of Fig. FIG. 2 is a sectional view taken along line I after the conductive wire is caulked and clamped. A... Electric contact part, B... Wire connection part, a... Conductor clamping part, 3... Board part,
4... Folded polymer piece, 4a... Concavity, 4
b... Curved piece, 5... Conductor.

Claims (1)

[Scope of utility model registration request] In a terminal fitting having an electrical contact part and a wire connection part, two folded overlapping pieces are provided in the conductor clamping part of the electric wire connection part, and a plurality of recesses are symmetrically provided at each inner end of the folded overlapping pieces. A terminal fitting characterized in that a plurality of curved pieces are provided and formed by overlapping and lifting upward.