JPS6343794Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic relay, in particular to a structural means for selecting and setting the functional dimensions (lever ratio) of an L-shaped armature.

An electromagnetic relay consisting of a magnetic circuit, a coil, a contact spring assembly, etc. has conventionally been constructed as shown schematically in FIG. 1. That is, in FIG. 1 showing the electromagnetic relay in a non-operating state, one end of a bar-shaped iron core 2 is fixed to the center of the vertical surface of the L-shaped yoke 1 when viewed from the side,
An electromagnetic coil 3 is inserted into the iron core 2. on the other hand,
The armature 4, which is approximately L-shaped in side view, has a bent portion swingably engaged with the tip of the horizontal plane 1' shown in the figure of the yoke 1 parallel to the axis of the iron core 2, and one swinging surface 4' 2
The other side faces the magnetic pole face 2' with a predetermined distance apart,
An insulating card 5 fixed to the other swinging surface 4'' is in contact with the lower surface of the movable contact spring 6. Therefore, when a predetermined current is applied to the coil 3 to excite the magnetic circuit, the armature 4 folds. Rotates around the curved part,
The swinging surface 4' is attracted to the core magnetic pole face 2'. At the same time, since the card 5 pushes up the movable contact spring 6,
Movable contact 7 fixed to the tip of movable contact spring 6
contacts the fixed contact 9 fixed to the tip of the fixed contact spring 8. As a result, the movable contact spring 6 and the fixed contact spring 8, which were electrically insulated via the insulator 10, form an electrically conductive path. Then,
When the current is cut off and the excitation of the magnetic circuit is eliminated,
Since the armature 4 returns to its original state due to the elastic restoring force of the movable contact spring 6, the contacts 7 and 9 are separated, and the electrical continuity is eliminated.

However, in such conventional electromagnetic relays, the tip of the yoke component (horizontal surface 1') parallel to the core axis and the core magnetic pole surface are located in substantially the same plane. Therefore, as shown in Fig. 2, the armature 4 has a length from the bent part to the center of the opposite magnetic pole surface as la, a length from the bent part to the card 5 as lb, and the magnetic attraction force of the iron core is If Fa, then the force Fb of the card 5 pushing up the movable contact spring is Fa×la/lb. In the conventional type shown in FIG. 1, the desired pressing force Fb and stroke s on the pressing side of the contact spring assembly of the armature are obtained by selecting la and lb.

However, if the dimensions of the electromagnet consisting of the iron core 2 and the coil 3 and the card mounting position of the movable contact spring set pressed by the armature 4 (pressing position of the movable contact spring set) are determined, the first In the conventional model shown in the figure, the dimensions la and lb are fixed, and therefore the lever ratio P (=la/lb) is also fixed, so for example,
If the movable contact spring set requires a pressure greater than Fb obtained with this lever ratio P, there is a problem that it cannot be driven, and its load characteristics (a function of the armature swing stroke s') There is a drawback that the range of applicable contact spring assemblies that can be matched with the pressing load of the contact spring assemblies is limited, and even in such cases, it has been desired to be able to select the lever ratio P over a wide range. .

The present invention is intended to eliminate the above-mentioned drawbacks, expand the selection range of lever ratios, and expand the range of applicable contact spring assemblies. is shorter than the core length to provide a difference, and the center of one swinging surface that approaches and separates from the magnetic pole surface of the iron core, of the armature whose bent portion is engaged with the tip of the component of the yoke, faces the magnetic pole surface of the armature. The ratio of the distance between the interlocking bent parts and the distance between the card pressing position on the other swing surface and the interlocking bending part can be adjusted without changing the dimensions of the rod-shaped core and the relative position of the card pressing position with respect to the iron core.
This is achieved by an electromagnetic relay characterized in that it is configured to be determined in accordance with the difference between the iron core length and the yoke component length.

The present invention will be described below with reference to FIG. 3, which shows the magnetic circuit and coil of an electromagnetic relay according to an embodiment of the present invention in a non-operating state.

In FIG. 3, in which the same reference numerals are used for parts that can be common to those in FIG. However, the electromagnetic coil 3 is attached to the iron core 2.
is inserted. On the other hand, the armature 14 is made of a magnetic material and is bent into two stages and has an approximately L-shape when viewed from the side.
One bending part is swingably engaged with the tip of the constituent part (horizontal plane in the figure) 11' of the yoke 1 parallel to the axis of the iron core 2, and one swinging surface extends further than the other bending part. 14' faces the iron core magnetic pole surface 2' at a predetermined distance, while the card 5 fixed to the other swinging surface 14'' is in contact with a movable contact spring (not shown). When a predetermined current is applied to the coil 3, the armature 14 rotates around the engaging bent portion, and the swinging surface 14' is attracted to the magnetic pole surface 2'.At the same time, the card 5 pushes up the movable contact spring. , a contact connection similar to that described with reference to FIG. 1 is made.Then, when the current is cut off, the armature 14 returns to its original position as shown, and the contact connection is opened.

However, the horizontal plane 11' of the yoke has a dimension m from the iron core 2.
Therefore, in the armature 14 that is engaged in the predetermined manner and swings, the length from the engaging bent part to the center of opposing magnetic pole faces is la', and the length from the engaging bent part to the card 5 is When the length dimension is lb' and the positional relationship between the card 5 and the movable contact spring is the same as that of the conventional one shown in FIG. 1, la'>la and lb'<lb. Therefore, the force Fb' with which the card 5 in FIG. Therefore, the swing stroke s' of the armature 14 (Figure 3 shows the non-operating state of the armature 14, and the stroke on the side where the iron core comes into contact with and leaves the magnetic pole face is s') However, the stroke on the side that presses the movable contact spring set can be converted) and the force Fb' that presses the movable contact spring set is the dimension m and its m
Correspondingly, la′, lb′A and the bending angle can be set to their optimum values by selecting the armature.

As explained above, according to the present invention, the range of load characteristics of contact spring sets that can be applied is expanded without changing the magnetic characteristics of the magnetic circuit, that is, an electromagnetic relay that can increase the types of contact spring sets. There is an effect that can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a schematic configuration of a conventional electromagnetic relay, Fig. 2 is a functional dimensional diagram of an armature attached to the relay, and Fig. 3 is a magnetic circuit of an electromagnetic relay according to an embodiment of the present invention. FIG. 3 is a side view showing the electromagnetic coil in a non-operating state. In addition, in the figure, 1 and 11 are yoke, 1', 1
1' is a yoke component parallel to the iron core, 2 is the iron core, 3 is a coil, 2' is the iron core magnetic pole surface, 4 and 14 are armatures,
4'4'', 14', 14'' are armature swinging surfaces, and 5 is an insulating card.

Claims (1)

[Claims for Utility Model Registration] A bending portion of an armature that is approximately L-shaped when viewed from the side is engaged with the tip of a component of a yoke that is approximately parallel to the axis of the rod-shaped iron core and is approximately L-shaped when viewed from the side, and the armature An electromagnetic relay in which one swinging surface of the iron core moves toward and away from the magnetic pole surface of the iron core, and the other swinging surface presses a movable contact spring via a card to operate the relay, the structure being parallel to the iron core axis of the yoke. The length of the part is made shorter than the length of the core to provide a difference, and the bending part is engaged with the tip of the component part, and the swinging surface of the armature, which approaches and separates from the magnetic pole surface of the core, has a difference in length. The relationship between the dimensions of the rod-shaped core and the card pressing position with respect to the iron core is determined by determining the ratio of the distance between the opposing center of the magnetic pole faces and the engaging bent part, and the distance between the card pressing position of the other swinging surface and the engaging bent part. An electromagnetic relay characterized in that it is configured to be determined in accordance with the difference without changing the position.