JPH10189085A - Female terminal structure for printed board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a risk for developing crack of a soldered part by increasing the plate thickness of a pressure contact part for pressure contacting a bus bar or the like at the prescribed contact pressure, while reducing the plate thickness of a fixing part for the alleviation of stress. SOLUTION: The thickness t2 of a pressure contact part 5a is made large, and the thickness t3 of a fixing part 5b is made small so as to keep a relationship of t2>t3, thereby enabling the thick pressure contact part 5a to pressure contact a bus bar 3 or the like at the prescribed contact pressure, and alleviating stress via the deflection of the thin fixing part 5b. A female terminal 5A has the plug part 5d of a fixing part 5b inserted in the mounting hole of a printed board, and the lower end of the fixing part 5b and the plug part 5d are soldered to both sides of the printed board. As a result, the thick pressure contact part 5a having the thickness of t2 can pressure contact the bus bar 3 or the like at the prescribed contact pressure, and stress is alleviated via the deflection of the thin fixing part 5b having the thickness of t3, thereby eliminating a risk for developing crack in a soldered part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a female terminal for soldering a printed circuit board housed in an electric connection box of an automobile to press-connect a bus bar or a terminal for press-contacting a core wire.

[0002]

2. Description of the Related Art Hitherto, as the above-mentioned female terminals, box-shaped tongue female terminals have been often used. However, it is difficult to arrange a large number of female terminals at a narrow pitch and the structure is complicated. Therefore, there is a problem that the cost of the molding die becomes high.

For this reason, as shown in FIG.
It is conceivable to use a flat female terminal 1 having a press-contact portion 1a for press-contacting the like and a fixing portion 1b for soldering a to the printed circuit board 2.

[0004]

However, when the thickness t1 of the fixing portion 1b is increased together with the fixing portion 1b so that the bus bar 3 and the like can be pressed against the pressing portion 1a of the female terminal 1 with a predetermined contact pressure.
Due to the thermal stress of the vehicle environment, soldering a
Cracks may occur.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a structure of a female terminal for a printed circuit board which can obtain a predetermined contact pressure and does not have a risk of cracking in soldering. It is intended for.

[0006]

According to the present invention, there is provided a flat female terminal having a pressure contact portion for pressing a bus bar or the like and a fixing portion for soldering to a printed circuit board. The plate thickness of the press-contact portion is formed to be thick enough to press a bus bar or the like with a predetermined contact pressure, and the plate thickness of the fixing portion is formed to be a thin thickness capable of relaxing stress. An object of the present invention is to provide a structure of a female terminal for a printed circuit board.

According to the present invention, by increasing the plate thickness of the press contact portion and reducing the plate thickness of the fixed portion, the bus bar can be pressed against the thick press contact portion with a predetermined contact pressure. The stress is relieved, and there is no risk of cracking in soldering.

In addition, since it is not a conventional female terminal with a tongue piece but a female terminal of a press-contact type, a large number of terminals can be arranged at a narrow pitch and the structure is simple, so that the cost of a molding die is low. become.

The female terminal may be constituted by a single plate having a thick press contact portion and a thin fixing portion, or a single plate having a thin fixing portion may be formed by folding the single terminal. It is possible to form a thick press-contact portion by overlapping.

Further, when a curved portion for relaxing stress is formed in the fixing portion of the female terminal as described above, the stress is further relaxed by the curved portion.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. The parts having the same configuration and operation as those of the prior art in FIG. 5 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 1 shows a single-plate female terminal 5A. That is, the plate thickness t2 of the press contact portion 5a is increased, and the plate thickness t of the fixed portion 5b is increased.
3 is thinned (t2> t3) so that the bus bar 3 and the like can be pressed by the thick press contact portion 5a with a predetermined contact pressure, and the stress can be relieved by bending of the thin fixing portion 5b.

The female terminal 5A is formed by drawing a base material having a thick press contact portion 5a and a thin fixing portion 5b.
It can be easily formed by punching out the predetermined female terminal 5A with a press or the like.

The fixed portion 5b of the female terminal 5A has a curved portion 5
c and the mounting holes 2a of the printed circuit board 2.
5d is formed.

As shown in FIG. 2, the female terminal 5A has an insertion portion 5d of a fixing portion 5b inserted into a mounting hole 2a of the printed circuit board 2, and a lower end of the fixing portion 5b and the insertion portion 5d are connected to the printed circuit board 2. Solder a, a on both sides. When the female terminal 5A is covered by the case 6 attached to the printed circuit board 2, when the bus bar 3 or the like is inserted into the press contact portion 5a, the press contact portion 5a is likely to bend in the insertion direction (see arrow c). Since the stop is performed, the insertion of the bus bar 3 and the like can be performed smoothly.

In the case of the above-mentioned female terminal 5A, the bus bar 3 and the like can be pressed with a predetermined contact pressure at the thick pressure contact portion 5a with the plate thickness t2, and the stress is relaxed by bending at the thin fixed portion 5b with the plate thickness t3. In addition, there is no possibility that cracks may occur in the soldering a. In particular, when the curved portion 5c for stress relaxation is formed in the fixed portion 5b, the stress is further relaxed by the curved portion 5c.

Further, since the female terminal 5A is a press-contact type flat plate-shaped terminal, as in the case of a normal press-contact terminal, a large number of the terminals can be arranged at a narrow pitch. Become cheap.

Like the female terminal 5B shown in a plan view in FIG. 3A, a single plate having a small thickness t3 of the fixing portion 5b is double-folded to form a press contact portion 5a having a thickness t2 (t3 + t3). 3 or folded three times as shown in FIG.
2 (t3 + t3 + t3) pressure contact portions 5a may be formed.

In the above embodiments, the female terminals 5A, 5B
Although the pressure contact portion 5a is downward, it may be upward as shown in FIG. 4 (A) or laterally as shown in FIG. 4 (B).

[0020]

As is clear from the above description, the structure of the female terminal according to the present invention is such that the thickness of the press contact portion is increased so that the bus bar and the like can be press-contacted with a predetermined contact pressure, and the fixing portion is fixed. By reducing the plate thickness so that the stress can be relieved, there is no risk of cracking in the soldering.

Further, since it is a press-contact type flat female terminal, a large number of terminals can be arranged at a narrow pitch, and since the structure is simple, the cost of a molding die is reduced.

The female terminal can be formed by a single plate as described in claim 2, or can be formed by folding a single plate as described in claim 3.

Further, the stress can be further reduced by the curved portion of the fixing portion of the female terminal.

[Brief description of the drawings]

FIG. 1 is a female terminal of the present invention, wherein (A) is a plan view,
(B) is a front view, (C) is a side view.

FIG. 2 is a front view of a female terminal covered by a case.

FIGS. 3A and 3B are plan views of a female terminal obtained by folding a single thin plate.

4A and 4B are front views of the female terminal, in which a press contact portion is directed upward and FIG. 4B is a front view in which a press contact portion is directed downward;

FIG. 5 is a conventional female terminal, (A) is a front view,
(B) is a side view.

[Explanation of symbols]

 2 Printed circuit board 3 Bus bar etc. 5A, 5B Female terminal 5a Press-contact part 5b Fixed part 5c Curved part 5d Insertion part t2, t3 Thickness

Claims (4)

[Claims] 1. A flat female terminal having a pressure contact portion for pressing a bus bar or the like and a fixing portion for soldering to a printed board, wherein the thickness of the pressure contact portion is such that the bus bar or the like is pressed at a predetermined contact pressure. The structure of the female terminal for a printed circuit board, wherein the structure is formed to have a large thickness capable of being pressed against and a thin thickness capable of relaxing stress. 2. The structure of a female terminal for a printed circuit board according to claim 1, wherein said female terminal comprises a single plate having a thick press contact portion and a thin fixing portion. 3. The structure of a female terminal for a printed circuit board according to claim 1, wherein the female terminal forms a thick press-contact portion by folding a single plate having a thin fixed portion. 4. The structure of a female terminal for a printed circuit board according to claim 1, wherein a curved portion for reducing stress is formed in the fixing portion of the female terminal.