KR100402431B1 - Terminal connection structure - Google Patents

Abstract

An object of the present invention is to ensure that strength is sufficiently obtained when a terminal of an electronic component such as a reed switch is welded to a terminal.

In the configuration, in a terminal connection structure in which a first terminal formed of a flat plate and a second terminal formed of a material different from the first terminal and having a circular cross section for forming a lead portion of an electronic component are welded and connected, The welded portion of the first terminal and the second terminal has a non-thermal conductivity structure.

Description

Terminal connection structure

(Industrial use)

TECHNICAL FIELD This invention relates to the connection structure of terminals, such as a mechanical acceleration switch used for the malfunction prevention of the air-bag system of a motor vehicle, for example.

(Conventional technology)

The conventional terminal connection structure of this type will be described by taking a vertical mechanical acceleration switch shown in Figs. 12 and 13 as an example, and details thereof will be described with reference to Figs.

That is, such a concrete structure is formed integrally with the casing 1 and its casing 1 made of a nonmagnetic insulating material such as 6 nylon, for example, and along the center of the shaft. A lead switch 2 is inserted into a cylindrical inner cylinder portion 1a, and the lead switch 2 has a pattern formed on one terminal 2a and a circuit board. pattern formed on the circuit board similarly to the lead wire 4 connected to the other terminal 2b and the terminal 3a at the same time as the electric welding of one terminal 3a soldered to the pattern) The other terminal 3b, which is connected by soldering, is fixed in the inner cylinder portion 1a with a filler 5 such as, for example, an epoxy resin after being electrically welded.

Further, the outer side of the inner cylinder portion 1a is mounted to move in the axial direction when the acceleration is applied to the magnet 6, and the magnet 6 is in the OFF direction of the reed switch 2, that is, the recessed portion 1b. The opening end on the opposite side to the recess 1b in the casing 1 is fitted with an O-ring 8 so as to be oriented by a spring in the It is attached to the gap 9, and by this gap 9, the magnet 6 and the spring 7 are prevented from coming out of the casing 1, and prevent the ingress of water droplets.

Next, according to FIGS. 14 to 17, the connection structure of the terminal 2b and the terminal 3b connected to the terminal 2a and the terminal 3a of the reed switch 2 and the lead wire 4 will be described. Explain. Since both terminals 3a and 3b have the same function and have the same shape, only one terminal 3a will be described.

That is, as shown in FIG. 15, the terminal 3b is formed of the plate-shaped terminal welding piece 10 and the terminal welding piece 10 of which the terminal 2a or 2b of the reed switch 2 is electrically welded and connected. It consists of a pair of pattern connecting piece 11 extended in one direction at right angles, and arranged in parallel.

Next, the operation will be described.

The acceleration switch configured as described above is usually in a state in which the magnet 6 is pulled to the off position of the reed switch 2 by the spring 7, that is, in the off state. In this off state, the malfunction of the airbag due to the malfunction of the electric circuit is prevented.

When an acceleration shock is applied to the acceleration switch caused by the collision of the vehicle in such an off state, the magnet 6 moves against the elastic force of the spring 7, and the reed switch 2 is turned on to turn on the airbag ignition primer. An ignition current flows through the airbag. In addition, when the electric acceleration shock becomes small, the magnet 6 moves by the spring 7 in the OFF direction of the reed switch 2, and the reed switch 2 returns to the off state.

In this configuration, when the vehicle receives a large acceleration in the front-rear direction, that is, in the vertical direction in FIG. 14 due to the collision of the vehicle, the magnet 6 moves up and down the inner cylinder portion 1a in response to the acceleration, and thus the contactor ( 2c, 2d). In this way, the magnetic force of the magnet 6 causes each of the contacts 2c and 2d to stick to each other so that an ignition current is applied to the primer (not shown) through the contacts 2c and 2d and the terminals 2a and 2b. Supplied, the airbag is activated.

Therefore, upon receiving the acceleration detection signal, the ignition current of the airbag ignition primer flows and an explosion causes the airbag to immediately inflate.

(Tasks to be solved by the invention)

However, in the terminal connection structure of the acceleration switch described above, the terminals 2a and 2b of the reed switch 2 are made of magnetic material such as Ni alloy, and the terminals 3a and 3b are made of copper-based nonmagnetic material. Since the conductive resistance values of the two terminals differ greatly, that is, the conductive resistance values of the terminals 3a and 3b are very low with respect to the terminals 2a and 2b, and the contact areas of the terminals 2a and 2b are large. When the electric welding is attempted to the welding portion 10 of 3b), the amount of heat generated is small with respect to the amount of current flowing in, and the generated heat spreads to the entire terminals 3a and 3b with good thermal conductivity. There was a problem that could not be obtained.

Accordingly, the present invention has been made in view of the above problems, and an object thereof is to ensure that the strength of welding a terminal of an electronic component such as a reed switch to a terminal is sufficiently firm.

(Configuration to solve the task)

According to a first aspect of the terminal connection structure, a first terminal formed of a flat plate and a second terminal having a circular cross section formed of a material different from the first terminal and forming a lead portion of an electronic component are welded to each other. In the terminal connection structure, the welding part with the 2nd terminal of a 1st terminal has a current concentrating structure.

According to a second aspect of the invention, the welded portion of the first terminal having a flat plate shape and the welded portion of the second terminal having a circular cross section are electrically welded so as to make point contact.

3rd invention consists of formed so that the welding part of a 1st terminal may be mountain-shaped, and the ridgeline is orthogonal to the axial direction of a 2nd terminal.

According to a fourth aspect of the invention, the welded portion of the first terminal has a hill shape and its height is about 1/2 of the diameter of the second terminal.

(Action)

According to the first aspect of the invention, since the current concentrates on the welded portions of the first and second terminals, the heat generation amount of the welded portion can be increased.

According to the second aspect of the invention, since the welded portion of the first terminal and the welded portion of the second terminal are in point contact, the heat generating force can be increased.

According to the 3rd invention, since the part which can weld a 1st terminal forms a ridgeline, and the 2nd terminal which has a circular cross section is welded and welded anywhere on the ridgeline, welding operation is easy.

According to the fourth invention, since the height of the welded portion of the first terminal is about 1/2 of the diameter of the second terminal, the second terminal does not melt and break at the time of welding, so that the welding strength can be sufficiently obtained.

(Example)

Examples of the present invention are shown below. The same components as those shown in Figs. 12 to 17 are denoted by the same reference numerals and the detailed description thereof will be omitted.

[First Embodiment]

As shown in FIGS. 1 to 4, the welded portions 12, 12 of the terminal welding pin portions 10, 10 of the terminals 3a, 3b have a semicircular cross section (see enlarged main portion of FIG. 7). The ridge line direction is arrange | positioned so that it may orthogonally cross the extension direction of the front-end | tip of the terminal 2a, 2b of the reed switch 2 (or the front-end | tip part of the lead wire 4). Therefore, when both welding parts are contacted with each other for electric welding, they can make point contact and can raise a calorific value. In FIG. 1, even if the terminals 2a and 2b of the reed switch 2 are slightly shifted upward and downward with respect to the terminals 3a and 3b, the welding portions 12 are in contact with each other, so that welding is possible. It works.

Further, the welded portion 12 is not limited to a semicircle as shown in FIG. 7, but is a mountain as shown in FIG. 8, an ellipse in FIG. 9, a saw blade in FIG. 10, and a flat hill in FIG. 11. Nothing can be said about anything. Moreover, the height H which protrudes at this time is set to about 1/2 of the diameter of the terminal 2a, 2b of the reed switch 2, and welding strength can fully be obtained at the time of electric welding.

Second Embodiment

Since this embodiment differs only in the shape of the welded portion 12 from the first embodiment, only the other portions thereof will be described with reference to FIG. That is, as shown in FIG. 5, the shape is hemispherical and protrudes on one surface of the terminal welding piece 10. As shown in FIG.

Third Embodiment

In this embodiment, as in the first embodiment, the hole or concave groove 14 (see FIG. 6) is formed such that the terminal welding piece 10 has a flat plate shape and the welding current is concentrated in the terminal welding piece 10. It is installed. In addition, explanatory drawing of a hole is the same as 5th figure, but is comprised so that the part of code | symbol 12 may become a hole. The terminal 2a and the lead wire 4 of the reed switch 2 are placed and welded so as to cut the center of the hole horizontally or in the concave groove 14.

1 is an explanatory diagram for assembling the reed switch 2 and the terminal 3 in the embodiment of the present invention.

2 is a plan explanatory view of the terminal 3 in FIG.

3 is an explanatory side view of the terminal 3 viewed from the bottom in FIG. 2;

4 is an explanatory view of the left side of the terminal 3 in FIG.

5 is an explanatory diagram of an embodiment showing a case where the welded part is a hemisphere and a case where a hole for reducing the contact area of the welded part is provided.

6 is a plan view of an embodiment in the case where the concave groove 14 is provided in order to reduce the contact area of the welded portion.

7 is an enlarged view of the welded portion 12 having a semicircular cross section.

8 is an enlarged view of the welded portion 12 whose cross section is mountain-shaped.

9 is an enlarged view of the welded portion 12 having a semi-elliptic cross section.

10 is an enlarged view of the welded portion 12 having a saw blade shape in cross section.

11 is an enlarged view of a weld 12 having a flat hill shape in cross section.

12 is a sectional side view of an acceleration switch showing a conventional example.

13 is a bottom view of the acceleration switch in FIG.

14 is an explanatory view of assembling the reed switch 2 and the terminals 3 and 3 in FIG.

15 is a plan explanatory view of the terminal 3 in FIG.

FIG. 16 is an explanatory side view of the terminal 3 viewed from the bottom in FIG. 14; FIG.

17 is an explanatory view of the left side of the terminal 3 in FIG.

Explanation of symbols on the main parts of the drawings

2: lead switch 3: terminal

4: lead line 6: magnet

7: spring 9: gap

10: terminal welding piece 11 pattern connecting piece

12: weld 14: recessed groove

As described above, the present invention has the effect that it is possible to reliably and easily weld electronic components such as a reed switch to a terminal.

Claims (2)

A first terminal formed of a flat plate, In a terminal connection structure, in which a second terminal formed of a material different from the first terminal and having a circular cross section for forming a lead portion of an electronic component is welded and connected, The welded portion of the first terminal on the flat plate is in point contact with the welded portion of the second terminal having a circular cross section, The weld of the first terminal is shaped like a mountain and its height is about one half of the diameter of the second terminal. Terminal connection structure, characterized in that. A first terminal formed of a flat plate, In a terminal connection structure, in which a second terminal formed of a material different from the first terminal and having a circular cross section for forming a lead portion of an electronic component is welded and connected, The welded portion of the first terminal has a mountain shape and is formed such that its ridge line is orthogonal to the axial direction of the second terminal.