JPS6019327Y2 - terminal fittings - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a terminal fitting suitable for connecting aluminum electric wires, particularly aluminum single wires.

In order to connect a single aluminum wire to a terminal fitting, sharp protrusions are arranged in a row on the upper edge of both side walls of the terminal fitting, and these are curled and press-fitted into the aluminum conductor, so that they are crimped and engaged with the conductor. It has conventionally existed as a connection means for obtaining electrical and mechanical connectivity.

In this case, in order to further improve the connection characteristics, it is necessary to increase the number of protrusions and increase the number of engagement points with the conductor.

However, since there is a limit to the length of both side walls of the terminal fitting in the front and back direction, increasing the number of protrusions requires narrowing the width of the protrusions, and if the width is narrowed, the strength of the protrusions themselves decreases. However, there is a problem that it may bend when press-fitting into the conductor.

If the height of the protrusion is reduced in order to prevent bending, the press-fit depth will become shallower and the electrical connection characteristics will deteriorate.

The purpose of this invention is to solve the above-mentioned contradictory problems and to provide a terminal fitting that can have more contact points with protrusions than the conventional ones.

In order to achieve the above object distantly, this invention has a structure in which a plurality of large protrusions are provided on the upper edge of both side walls of the terminal fitting, and a plurality of small protrusions are provided on the top of one or more large protrusions. be.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

1 to 4 show a first embodiment of this invention.

The terminal fitting of this embodiment is provided with opposing side walls 2 on both sides of a terminal fitting 1 made of a metal plate bent into a substantially U-shape, and a large triangular protrusion 3 having sloped sides in the front and back on the upper edge of each side wall 2. The top of each large protrusion 3 is cut into a V-shape, and two small sharp protrusions 4 are formed at the front and rear of the cut.

Incidentally, at the rear end of the terminal fitting 1, an insulating layer gripping part 5 for the conductor A is formed so as to protrude in the shape of a horn on both sides, and at the front end thereof, an appropriately shaped electrical contact part 6 is formed.

As is clear from the developed view of FIG. 2, the large protrusions 3 formed on one side wall 2 and the large protrusions 3 formed on the other side wall 2 are half-pitch so that their peaks and valleys face each other. They are staggered.

Further, the distance d between the valleys of the large protrusions 3 on both sides along the metal fitting material surface is set to a length sufficient to surround the outer periphery of the conductor A.

Therefore, as shown in FIGS. 3 and 4, when the conductor A is inserted between the both side walls 3, the protrusions 3 and 4 are curled inward and press-fitted into the conductor A, and the conductor A is crimped and engaged, both sides large protrusion 3
are press-fitted with their peaks and valleys fitting into each other, and the engaging outer edges of both side walls 2 (conductor crimping parts) (the envelope line of the valleys showing the interval d in FIG. 2) are in linear contact with each other, Corrosion of the conductor A is prevented by tightly closing the contact portion.

Next, in the second embodiment, the shape of the large projection is modified as shown in FIG. The large protrusion 3 formed on the side wall 2 and the large protrusion 3' formed on the other side wall 2 are formed so that the vertical side 7 and the inclined side 8 are in a reverse position. It is something that

The other configurations are the same as in the first embodiment.

In the case of this embodiment, the front surface of the large protrusion 3 formed on one side wall 2 has a surface including the vertical side 7, so when the conductor A is press-fitted into the conductor A, this surface is Since it is at a right angle, the resistance is greater than in the case of an inclined surface.
Has a retaining effect.

In the third embodiment, as shown in FIG. 6, both the front and rear surfaces of the large protrusion 3 are vertical, and the effect of preventing the large protrusion from slipping out is even more remarkable.

In the fourth embodiment, as shown in FIG.
It is provided so as to be offset toward the front of the holder, and a flat portion 9 is formed at the rear end portion.

Although this flat portion 9 is also somewhat press-fitted into the conductor, the stress is dispersed because the tip is not sharp.

This embodiment maintains sufficient electrical connection characteristics at the front of the side wall 2, which is the conductor crimping portion, while compensating for the weakening mechanical characteristics of the conductor A at the rear end of the side wall 2. It is possible to obtain better properties than conventional ones both physically and mechanically.

Furthermore, by providing the flat portion 9 with excellent mechanical gripping force at the rear end, it is possible to prevent deterioration of the connection due to force to pull out the wire from the terminal fitting or bending of the wire.

Incidentally, as shown in FIG. 8, minute irregularities 10 may be formed on the upper edge of the flat portion 9.

In order to replenish the bonding area between the protrusion 3.4 and the conductor A that has been reduced by adopting the flat portion 9, the minute unevenness 10 increases the bonding area between the flat portion 9 and the conductor A, and also increases the bonding area between the flat portion 9 and the conductor A. This is to facilitate press-fitting the edge into the conductor A.

In the fifth embodiment, as shown in FIG. 9, at the top of the small protrusion 4,
A chamfered portion 11 is formed on the side wall 2 and is inclined downward toward the outside, which has the effect of reducing the positive resistance to the conductor.

Note that the shape of the large protrusion 3 may be of any of the embodiments described above.

Further, it is more preferable to form the chamfered portion 11 by cold working, since the strength of the tip portion of the small protrusion 4 increases due to work hardening.

In the sixth embodiment, as shown in FIGS. 10 and 11, the front surface 12 and rear surface 13 of the large protrusion 3 and the small protrusion 4 are inclined with respect to the outward direction of the side wall 2, and in this case as well. ,
This has the effect of reducing the press-fit resistance to the conductor, and if the slope is formed by cold working, the effect of work hardening can be obtained as in the case described above.

In each of the above examples, two small protrusions are formed on the top of every large protrusion, but two or more small protrusions are formed on at least one large protrusion. There may be.

As described above, the terminal fitting of this invention has a plurality of small protrusions formed on the top of the large protrusion formed on the upper edge of the side wall, so the width of the large protrusion is not narrowed and the number of protrusions is reduced. It is possible to increase the

Therefore, according to the terminal fitting of this invention, when the large protrusion is curled and press-fitted into the conductor, it does not bend, and there are many engagement points with the conductor, and it can be inserted deeply, so that electrical , has the effect of improving mechanical properties.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the first embodiment, Fig. 2 is a developed view, Fig. 3 is a plan view in use, Fig. 4 is an enlarged sectional view in use, and Fig. 5 is a perspective view of the second embodiment. 6 is a perspective view of the third embodiment, FIGS. 7 and 8 are perspective views of the fourth embodiment, FIG. 9 is a partially enlarged perspective view of the fifth embodiment, and FIG. 10 is a perspective view of the fourth embodiment. FIG. 11, a partially enlarged side view of the sixth embodiment, is a sectional view taken along the line X-X. 1...Terminal fitting, 2...Side wall, 3,3
′...Large protrusion, 4...Small protrusion.

Claims (7)

[Scope of utility model registration request] (1) In a terminal fitting with opposing side walls on both sides,
A terminal fitting characterized in that a plurality of large protrusions are provided on the upper edge of the side wall, and a plurality of small protrusions are provided on the top of the larger protrusion. (2) The front and rear surfaces of the large protrusion are respectively formed by surfaces including vertical sides and inclined sides, and the large protrusion formed on one side wall and the large protrusion formed on the other side wall are defined as the above-mentioned large protrusion. The terminal fitting according to claim (1) of the utility model registration, characterized in that the vertical side and the inclined side have a forward and backward positional relationship. (3) The terminal fitting according to claim (1), wherein the front and rear surfaces of the large protrusion are each formed by a surface including a vertical side. (4) The terminal fitting according to claim 1, which is a registered utility model, characterized in that a chamfered portion is formed at the top of the small protrusion so as to be inclined downwardly toward the outside of the side wall. (5) Each of the front and rear surfaces forming the large protrusion and small protrusion,
The terminal fitting according to claim (1) of the utility model registration, characterized in that the side wall is inclined outward. (6) The distance between the valley of the large protrusion formed on one side wall and the valley of the large protrusion formed on the other side wall along the metal fitting material surface is long enough to surround the outer periphery of the conductor to be connected. The terminal fitting according to claim (1) of the utility model registration claim, which is characterized by the following. (7) The terminal fitting according to claim (1) of the utility model registration, characterized in that the large protrusion is formed to be biased toward the front of the upper edge of the side wall, and a flat portion is formed at the rear end portion.