JPH0129707Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a structure in which a fixed contact spring is fixed to a fixed contact spring terminal in an electromagnetic relay, and a free end of the fixed contact spring is movably supported by the fixed contact spring terminal. .

The structure of a fixed contact spring terminal in a conventional electromagnetic relay is as shown in FIGS. 1 and 2.

In the figure, 1 is a molded base block, 2
is an armature, 2a is a bushing, 3 is a yoke, 4 is a coil winding frame, 5 is a coil terminal, 6 is an electromagnetic coil wound around the coil winding frame 4, 7 is an iron core, 8 is a movable contact spring terminal, 9 is a movable contact spring, 9a is a movable contact,
10 is a hinge spring, 11 is a fixed contact spring terminal, 1
2a is a fixed contact.

The operation of the electromagnetic relay with this configuration is well known: when the coil terminal 5 is energized, the iron core 7 is excited and the armature 2 is attracted. When the armature 2 is attracted, the movable contact spring 9 is pushed up by the bushing 2a provided on the arm of the armature 2, and the movable contact 9a contacts the fixed contact 12a, thereby closing the contact circuit. When the energization is interrupted, the armature 2 is separated from the iron core 7 by the return force of the movable contact spring 9, and the contact circuit is opened.

In the structure shown in FIG. 1, the relationship between the displacement δ of the position of the bushing 2a provided on the arm portion of the armature 2 and the load p when the electromagnetic relay is in operation has the characteristics shown in FIG. Here, δ1 means that the movable contact 9a is the fixed contact 12
It is the amount of displacement from when the armature 2 comes into contact with the iron core 7 until it is completely attracted to the iron core 7, and p1 is the load in the same state. In this structure, when the load is opened and closed by the operation of the electromagnetic relay, the movable contact 9a and the fixed contact 1
2a is consumed and δ1 decreases, p1 also decreases, and p1 decreases greatly for a slight decrease in δ1, which has the disadvantage that the contacts may weld or the contact resistance increases, causing trouble in the contact circuit. ing.

FIG. 2 shows a structure in which the above-mentioned drawbacks have been eliminated, in which one side of the fixed contact spring 12 to which the fixed contact 12a is fixed is fixed to the fixed contact spring terminal 11, and its free end 12b
is arranged so as to press against the protrusion 1a provided on the base block 1, and when the electromagnetic relay is in operation, the free end 12b of the fixed contact spring 12 presses against the protrusion 1a provided on the base block 1.
It was made to float from above.

The relationship between the displacement δ of the bushing 2a provided on the arm of the armature 2 and the load p during this operation is the fourth
The characteristics are shown in the figure. In this structure, the decrease in p1 due to the decrease in δ1 is extremely small compared to the structure shown in FIG. 1, and has excellent effects on the welding resistance and life of the contact.

The base block 1 is made of plastic for its electrical insulation properties, and in the configuration shown in Figure 2, especially in the case of a contact circuit that switches on and off a large current, the base block 1 is fixed due to the heat caused by the arc generated when the current is applied to the contacts and when the current is switched on and off. Projection 1 provided on base block 1 movably supporting free end 12b of contact spring 11
A has the disadvantage that it deforms and impairs the characteristics of the electromagnetic relay. In addition, the fixed contact spring terminal 11
The variation in the gap A between the fixed part to which the fixed contact spring 12 is fixed and the free end 12b of the fixed contact spring 12 depends on the fitting accuracy between the fixed contact spring terminal 11 and the base block 1, and the protrusion provided on the base block 1. Since the sum of the variations in the position of 1a becomes large, it has the disadvantage that the variation in load also becomes large.

In order to eliminate the above drawbacks, the present invention provides a support portion for the fixed contact spring 12 on the fixed contact spring terminal 11.

Hereinafter, the present invention will be explained in detail based on the drawings. FIG. 5 is a front view showing the electromagnetic relay of the present invention, in which 11a indicates the fixed contact spring 12 integrally raised with the fixed contact spring terminal 11. This is a support portion of the free end portion 12b. The following configuration is the same as that described above.

FIG. 6 shows an embodiment showing the main parts of the present invention, in which FIG. 6A is an exploded perspective view showing the structure of the fixed contact spring terminal and the fixed contact spring, and FIG. 6 is an assembled perspective view thereof. A hole 12c is formed in the fixed contact spring 12, and the hole 12c is fitted into a protrusion 11b provided on the fixed contact spring terminal 11 and fixed thereto.

Note that the shape of the support portion 11a that movably supports the free end portion 12b of the fixed contact spring 12 provided on the fixed contact spring terminal 11 may be in the shape of a hole 11c as shown in FIG. 7, or may be in the shape of a hole 11c as shown in FIG. The shape of the supporting portion 11d may also be used.

The electromagnetic relay of the present invention assembled in this way has the same excellent features as the electromagnetic relay shown in FIG. Since the gap A between the fixing surface and the supporting surface can also be manufactured with high precision due to integral processing, it has great effects such as extremely little variation in load and making it possible to provide an electromagnetic relay with high sensitivity.

[Brief explanation of drawings]

1 and 2 are front views showing a conventional electromagnetic relay, and FIGS. 3 and 4 show the displacement and load of the arm portion 2a of the armature 2 during the operation shown in FIGS. 1 and 2, respectively. It is a characteristic diagram showing a relationship. FIG. 5 is a front view showing the electromagnetic relay of the present invention, and FIGS. 6 to 8 are perspective views showing the configuration of the main parts of the present invention. 11...Fixed contact spring terminal, 11a...Fixed contact spring support portion, 12...Fixed contact spring.

Claims (1)

[Scope of utility model registration request] An electromagnetic relay characterized in that a fixed contact spring is fixed to a fixed contact spring terminal, and a support part that movably supports a free end part of the fixed contact spring other than the fixed part is integrally provided with the fixed contact spring terminal.