JPS6237319Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a recovery spring for an electromagnetic relay.

The restoration spring of the electromagnetic relay is used to quickly restore the contacts after the excitation of the electromagnet is released, and to maintain this restored state. Most recovery springs for conventional electromagnetic relays are composed of a single leaf spring, and the stiffness of the spring characteristics is constant. Therefore, the load force exerted by the recovery spring on the moving member that contacts the recovery spring and moves by the excitation of the electromagnet to open and close the contact, etc., is due to external vibrations, as shown by A in Fig. 1. A linear change between the load force f ₁ required to overcome an impact and maintain the moving member in its restored state, and the load force f ₂ required to quickly restore the moving member after the electromagnet is de-energized. do. On the other hand, the magnetic attraction force required to operate an electromagnetic relay that moves a moving member by excitation of an electromagnet must be greater than the total load, which is the sum of the load on the recovery spring, the load on the contact springs, the friction load on the mechanism, etc. . However, this magnetic attraction force characteristic is a quadratic curve bulging downward as shown in B in FIG. 1, and must always be above straight line A. Therefore, straight line A
Since the point B _{' that} is closest to It was hot.

The object of the present invention is to provide a recovery spring for an electromagnetic relay that overcomes these drawbacks.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 2 is a cross-sectional view showing the entire electromagnetic relay using the restoration spring of the present invention, Figure 3 is a perspective view with the case and cover removed, and Figure 4 is an enlarged perspective view of the restoration spring. It is.

In these figures, 1 is a case, 2 is a cover, and 3 is an electromagnet.

Above the electromagnet 3 (in FIGS. 2 and 3), a rectangular flat contact board 5 on which a plurality of contacts 4 are arranged in a plane is fixed to the case 1. A holding member 8, which is a moving member that holds a coil-shaped conductive member in a recess 7 on the lower surface and moves by electromagnetic drive, is disposed so as to be movable in a direction parallel to the contact substrate 5.

This holding member 8 is sandwiched between the upper end of an armature 9 provided on the iron core 3a side of the electromagnet 3 and the upper end of a recovery spring 10 provided on the opposite side of the electromagnet 3 from the armature 9. It's summery. When the electromagnet 3 is energized, the upper end of the armature 9 becomes the recovery spring 1.
Therefore, the armature 9 moves in the direction of the recovery spring 10, and when the excitation is released, the holding member 8 is moved to the armature 9 by the urging force of the recovery spring 10. It's starting to move back towards the direction.
As the holding member 8 moves, the conductive member 6 sandwiched between the recess 7 of the holding member 8 and the contact substrate 5 moves while being in contact with the upper surface of the contact substrate 5. For example, as shown in FIG. 5, the contact board 5 has contacts 4a, 4.
b, 4c are arranged and the holding member 8 is located on the right side (in FIG. 2), the contact 4a and the contact 4b are electrically connected by the conductive member 8,
When the holding member 8 is located on the left side (in FIG. 2), the conductive member 8 connects the contacts 4a and 4c.
are electrically connected. Therefore, by moving the holding member 8, the connection state between the contacts can be changed.

The armature 9 is attached to a hinge spring 12 bent at a substantially right angle to one end of a metal strip 11,
The recovery spring 10 is constituted by a single leaf spring bent at a substantially right angle to the other end of the strip 11.

As shown in FIG. 4, this restoration spring 10 has a bent portion 10c in which the free end 10b side is slightly bent toward the armature 9 at an intermediate point between the fulcrum 10a bent at an approximately right angle and the free end 10b, and the free end 1
It has two cuts 13, 13 cut from 0b toward the fulcrum 10a to a slightly upper part of the bent part 10c,
These two cuts 13, 13 constitute three leaf spring parts 14a, 14b, 14c.
At least the leaf spring portions 14a, 1 on both sides
4c are formed to have the same width and the same stiffness, and the stiffness of the central leaf spring portion 14b is set to be smaller than the total stiffness of the leaf spring portions 14a and 14c on both sides, and the central leaf spring portion 14b is set to have the same width and stiffness. The stiffness of the portion 14b is set to f ₁ shown in FIG. This central leaf spring part 1
4b has a greater degree of tension bending so that it is tilted more deeply toward the armature 9 than the other two leaf springs 14a and 14c, and the electromagnet 3 is not excited as shown in FIGS. 2 and 3. In this case, as shown in FIG. 6a, only the central plate spring portion 14b is attached to the holding member 8.
the holding member 8 as shown in FIGS. 6b and 6c.
All the leaf spring parts 14a, 14b, 14c come into contact with the holding member 8 from a certain position where the holding member 8 moves to the left. Then, when the holding member 8 moves leftward and stops, the leaf spring parts 14a, 14b,
The load force applied to the holding member 8 by the entire 14c is set to be _f2 shown in FIG.

As described above, in the recovery spring of the present invention, the number of leaf spring parts that contact the three leaf spring parts 14a, 14b, and 14c changes from only one leaf spring part 14b to three leaf spring parts 14a, 14b, and 14c during the displacement of the holding member 8. The stiffness of the entire leaf spring is divided into two types: when there is only one leaf spring and when there are three leaf springs. Therefore, the load force applied to the holding member 8 by the recovery spring 10 has a characteristic similar to that of a magnetic attraction force whose gradient changes in two steps as shown in c in FIG. For this reason, the magnetic attraction force need not be lower than the load force shown by c, so it may be the one shown by D in FIG. 1, and it can be much smaller than the magnetic attraction force shown by A in the conventional case.

FIG. 7 shows another embodiment of the present invention.

In this embodiment, narrow leaf spring parts 14d and 14f are formed on both sides of the leaf spring, and are subjected to a greater tension bending process than the central leaf spring part 14e.

FIG. 8 shows yet another embodiment of the present invention.

In this embodiment, four notches 13 are provided to form five leaf spring parts 14g to 14k, the central leaf spring part 14i is bent with the maximum tension, and the leaf spring parts 14h and 14j on both sides thereof are bent as leaf spring parts. 14i and the leaf spring parts 14g, 14k, and as the holding member 8 moves leftward, the one leaf spring part 14i changes from the three leaf spring parts 14h, 14i, 14j. , Next, the number of contacting parts with all the leaf spring parts 14g to 14k changes in three stages.

As explained above, according to the recovery spring for an electromagnetic relay of the present invention, (a) the magnetic attraction force required for the operation of the electromagnetic relay can be significantly reduced compared to the conventional one, and therefore power consumption can be reduced.

(b) It is possible to set ideal load characteristics that match the magnetic attraction force characteristics.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the characteristics of the load force and magnetic attraction force of the restoration spring with respect to the displacement of the moving member, Fig. 2 is a sectional view showing an electromagnetic relay using the restoration spring according to an embodiment of the present invention, and Fig. 3 4 is a perspective view of a recovery spring according to an embodiment of the present invention; FIG. 5 is a perspective view of the electromagnetic relay shown in FIGS. 2 and 3; FIG. 6 is a diagram showing the relationship between the displacement of the moving member (holding member) and the recovery spring, and FIGS. 7 and 8 are perspective views showing other embodiments of the present invention. 3...Electromagnet, 4...Contact, 5...Contact board,
6... Conductive member, 7... Recessed portion, 8... Holding member,
9... Armature, 10... Recovery spring, 10a... Fulcrum, 10b... Free end, 10c... Bent part, 13
...Notch, 14a to 14k...Plate spring part.

Claims (1)

[Claims for Utility Model Registration] A movable member and an armature having an urging force that presses the movable member and the armature, the movable member being held between the free end and the armature, and the armature being attracted and moved by energization of an electromagnet. The movable member is allowed to move against the biasing force and is elastically deformed in a direction away from the armature around the fulcrum, and when the electromagnet is deenergized, the movable member is pushed back toward the armature. A restoration spring consisting of a single leaf spring for an electromagnetic relay that is restored by a user, wherein at least one notch is provided in the direction of the fulcrum so that the single leaf spring is divided into a plurality of parts from the free end. at least two leaf spring portions are formed, and the degree of tension bending of at least one leaf spring portion toward the moving member is made greater than the degree of tension bending of the other leaf spring portions, and the degree of tension bending of at least one leaf spring portion is made greater in the restored state. Only the free end of the leaf spring portion with a large degree of tension is brought into contact with the movable member, and the free end of the leaf spring portion with a small degree of tension bending is brought into contact with the movable member during the displacement of the movable member. A restoration spring for an electromagnetic relay, characterized in that the stiffness of the entire leaf spring changes from midway through the displacement of the moving member.