JPH0754909Y2 - Electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a hinge type electromagnetic relay that opens and closes a relatively large capacity load.

[Prior Art] FIGS. 8 and 9 show a conventional example in which an armature 53 attracted to an attracting surface of an iron core 52 having a coil 51 wound around the outer periphery thereof, a contact spring 54 and the like are molded by simultaneous molding. An amateur block 55 is formed. A return spring 56 is interposed between the yoke 57 and the amateur block 55. In this conventional configuration, the armature 53 and the contact spring 54 are simultaneously swung to open and close the contact.

[Problems to be solved by the invention] In such a conventional system, a large capacity of AC250V, 30A is controlled, so that contact wear is severe, the amount of overtravel at the contact part is reduced, and welding or contact failure occurs, resulting in a long service life. There was a problem that it was difficult to secure.

The present invention has been made in view of the above points, and an object of the present invention is to provide an electromagnetic relay for the purpose of extending the life of the contact portion.

[Means for Solving the Problem] The present invention provides a dowel that is contacted with a contact spring, which is held at a fixed position in the returning state of an amateur block, in the returning direction so as to compensate for overtravel and which can be consumed depending on whether the contact is opened or closed. It is a projecting piece on the base side.

[Operation] As the dowel wears out while the contacts are repeatedly opened and closed, the gap between the armature and the suction surface of the iron core widens, and this widening secures a larger amount of overtravel.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First, the entire electromagnetic relay will be described with reference to FIGS. 1 and 2. A substantially U-shaped partition wall 2 is formed on the upper surface of a body 1 made of an insulating material, a coil block is disposed on one side of the partition wall 2, and a contact block is disposed on the other side. Outer peripheral core 5 is inserted through the inside of the coil bobbin 3 which is wound around the coil 4, the horizontal piece ₆₁ of the base portion of the iron core 5 is the yoke 6
Stuck to. The tip of the iron core 5 protrudes from the coil bobbin 3, and the tip surface of the iron core 5 serves as a suction surface 5a. The positioning piece 6a of the yoke 6 is inserted into the slit 2a formed inside the partition wall 2 of the body 1 to position the yoke 6. The coil terminal 7 is inserted into the insertion hole 1a of the body 1.

The armature 9 and the holding terminal 11 are integrally formed by a molded base 10, a contact spring 12 is coupled to the holding terminal 11, and a movable contact 14 is fixed to the contact spring 12.
The amateur block 8 is formed by fixing 13 together. Tongues of the yoke 9 in the grooves 9a formed on both sides of the amateur 9.
6b is inserted, and the amateur block 8 is pivotally supported by the yoke 6 so as to be swingable. Movable contacts 14 on both sides of movable contact plate 13
The fixed terminal plates 16 provided with the fixed contacts 15 respectively corresponding to the above are arranged in the body 1. Elastic pieces on both sides of the top of the return spring 17
18 elastically contacts the base 10 of the amateur block 8 upward and urges the amateur block 8 in the direction of returning. Further, a locking piece 19 formed by notching in the approximate center of the return spring 17 is locked in a recess 20 formed in the inner surface of the partition wall 2 as shown in FIG. The cover 21 that covers the upper surface of the body 1 is formed in a box shape with an opening on the lower surface.

FIG. 1 shows a non-excited state, the contacts 14 and 15 are separated, and the coil 9 is excited to cause the armature 9 to move to the iron core 5.
The contact points 14 and 15 are closed by being attracted to the suction surface 5a. Then, when the coil 4 is de-energized, the return spring 17 causes the armature block 8 to return and the contacts 14 and 15 are separated. The elastic piece 18 indicated by the alternate long and short dash line in FIG. 1 (d) shows a natural returning state.

Next, the gist of the present invention will be described. As shown in FIG. 1 (d), a dowel 22 is provided so as to project from the surface of the holding terminal 11 of the amateur block 8 on the side of the contact spring 12. Movable contact plate 13
The fixed position of is fixed by the partition wall 2 of the body 1.
When the contact spring 12 contacts the contact spring 12, the contact spring 12 bends, and the armature block 8 bends as a whole. In this state, a gap of a predetermined size b is formed between the armature 9 and the attraction surface 5a of the iron core 5. To be done.

Here, the dowel 22 is consumed as the opening and closing are repeated. Then, the contact position (FIG. 1 (d)) a with respect to the holding terminal 11 becomes large, and the fixed position of the movable contact 14 is constant,
The gap b is relatively widened, so that a larger amount of overtravel can be secured. Therefore, the contact is consumed by opening and closing, and the overtravel amount is reduced at the contact portion, while the dowel 22 is consumed, the overtravel amount is increased, and the decrease in the overtravel amount can be suppressed as a whole.

Next, the structure of the fixed terminal board 16 will be described. Fig. 3 ~
As shown in FIG. 6, cut and raised pieces 23 are formed on both sides of the upper portion of the fixed terminal plate 16, and the cut and raised pieces 23 are inserted into the groove-shaped insertion portions 24 of the body 1. As shown in FIG. 6, the cut-and-raised piece 23 is bent at the upper portion and protrudes only c with respect to the insertion portion 24 of the body 1. Therefore, the cut-and-raised piece 23 is inserted by the projection c. It is bent by c along 24, and the hatched portion of the fixed terminal plate 16 shown in FIG. 4 is pressed against the body 1. By providing the cut-and-raised pieces 23 on the fixed terminal plate 16 in this manner, it is possible to suppress the backlash due to bending and heat shrinkage of the fixed terminal plate 16, and since the cut-and-raised pieces 23 are simply bent, the cut-and-raised pieces twenty three
It is easy to manage the dimension c of the above, and since the cut-and-raised piece 23 has a cut-and-raised shape, insertion into the body 1 is easy.

By the way, the stopper piece 25 on the upper part of the return spring 17 is located on the upper surface of the armature 9 so as to press the inertial force of the amateur block 8 when an impact is applied in the direction of the arrow shown in FIG. . In this embodiment, the bending angle of the stopper piece 25 is about 98 °. This is the 7th
This is because, as shown in the figure, when the drop impact is applied as shown by the arrow, the inertial force of the amateur block 8 is pressed by the bending of the spring of the stopper piece 25. in this way,
With the configuration, the locking piece 19 of the return spring 17 does not apply an inertial force to the partition wall 2, the partition wall 2 on the recess 20 side can be made thin, and space can be saved. It can be wound many times.

[Advantage of the Invention] As described above, the present invention provides a dowel that is contacted with a contact spring held at a fixed position in the returning state of the amateur block in the returning direction and wears depending on whether the contact is opened or closed for overtravel compensation. Since it is projected on the base side, as the dowel wears out as the contacts are repeatedly opened and closed, the gap between the amateur and the attraction surface of the iron core widens, and this widening secures more overtravel. Therefore, even if the contact is consumed, a stable contact pressure can be obtained for a long period of time, and the life of the whole can be extended.

[Brief description of drawings]

1 (a) to 1 (d) are a sectional view of an embodiment of the present invention, a cutaway front view, a plan view and a sectional view with a cover removed, and FIG.
Fig. 3 is an exploded perspective view of the same as above, Figs. 3 (a) and 3 (b) are side and front views of the fixed terminal plate, Fig. 4 is a plan view of relevant parts of the same, and Fig. 5 is a view of the same as above. Partial sectional view, FIG. 6 is an enlarged sectional view of the same as above, FIG. 7 is a sectional view of relevant parts of the same, FIG. 8 is a perspective view of a conventional example, and FIG. 9 is a sectional view of the same. 1 is a body, 4 is a coil, 5 is an iron core, 5a is a suction surface, 8 is an amateur block, 9 is an amateur, 10 is a base, 12
Is a contact spring, 14 is a movable contact, 15 is a fixed contact, and 22 is a dowel.

Claims (1)

[Scope of utility model registration request] 1. An iron core around which a coil is wound, a yoke whose one end is connected to the other end of the iron core whose one end is an attracting surface, and an armature pivotally supported at the other end of the yoke so that an armature is attached to the attracting surface of the iron core. A substantially L-shaped amateur block that can be freely sucked, and the amateur block includes an armature, a base that supports the armature, and a contact spring supported on the base side.
In an electromagnetic relay consisting of a movable contact that is fixed to the tip of this contact spring and is opposed to a fixed contact, the contact spring that is held at a fixed position in the return state of the amateur block is contacted in the return direction to compensate for overtravel. An electromagnetic relay characterized in that a dowel that can be consumed according to opening and closing of the contact is provided on the base side.