JP2574751Y2 - Electromagnetic relay - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay having an armature rotatably supported at a substantially central portion.

[0002]

2. Description of the Related Art Conventionally, as an electromagnetic relay of this type, an iron core around which a coil is wound, and a shaft portion provided at a substantially central portion in a longitudinal direction are rotatably supported on one side while a coil is provided. A substantially flat armature having directionality by fixing a non-magnetic metal plate to the suction surface of the one end to the iron core so that the other end is always attracted to the iron core when in the non-excited state. A and a movable contact spring directionally coupled to the other surface of the armature so that the movable contact moves toward and away from the fixed contact in response to the armature
B.

Here, the above-mentioned armature A and movable contact spring
B will be described in more detail with reference to FIG.

The armature A is formed in a substantially rectangular flat plate shape from a magnetic material such as electromagnetic soft iron, and is plated with metal such as nickel. shaft portion a _1, a ₂ each having a curved surface portion a _3, a ₄ to a ₅ side is provided, also on both sides of the center line connecting the shaft portions a _1, a _2, on one side a ₅ side By providing the circular concave dents A ₇ , A ₇ , circular projections (not shown) are formed on the other surface A ₆ side at positions opposite to those. The curved surfaces A ₃ , A ₄ of the shafts A ₁ , A ₂ are rotatably supported, and the armature A has both ends.
A ₈ and A ₉ are sucked and released by an iron core (not shown), and the curved surface portions A ₃ and A ₄ have abrasion-resistant resin polyfluorinated ethylene fiber ( (Trade name: Teflon) is coated.

In this case, since it is difficult to coat only the curved surface portions A ₃ and A ₄ , a plurality of armatures A contact one shaft portion A ₁ and the other shaft portion A ₂ adjacent to each other. In the state of being aligned, the concave dents A ₇ , A ₇ are formed over the coating portion A _10, that is, the center portion of the one surface A ₅ side including the shaft portions A ₁ , A ₂ in the lateral direction.
Except for the band portion around the width, after being sprayed Teflon subjected to so-called masking, when removing the masking, so that the Teflon is coated on the coating unit A _10.

[0006] Next, armature A is at one end A ₈ of the both end portions A _8, A ₉ is a suction surface of the iron core, for example, non-magnetic metal plate A _11, such as phosphor bronze is fixed, longitudinal It is asymmetrical in direction and has directionality. This non-magnetic metal plate A
_11, when the end portion A ₈ is sucked into the iron core, by which voids are formed on the suction surface by the thickness portion of the non-magnetic metal plate A _11, when the coil has been de-energized, constantly, its One end A ₈ is released from the iron core and the other end A ₉
Is attracted to the iron core, which is for performing a so-called monostable operation.

[0007] movable contact spring B is a leaf spring material such as phosphor bronze, provided with a movable contact B ₁ at both ends of the twins shape, and the external lead terminal on one side of the central portion B ₂ connecting both ends spring support portion B ₃ to be connected is formed. And, in the central portion B ₂ of the movable contact spring B, and provided with a coupling hole, by caulking the coupling hole in a circular projection provided on the other surface A ₆ side of the armature A, the movable contact Spring
B is coupled to the armature A, and the movable contact
B ₁ comes into contact with and separates from a fixed contact (not shown). When performing this connection, the spring support B ₃ of the movable contact spring B
Must be located on _one shaft part A ₁ side of the armature A,
That is, the movable contact spring B is directionally coupled to the armature A which is asymmetric in the longitudinal direction.

[0008]

In the above-described conventional electromagnetic relay, as described above, the movable contact spring B is directionally coupled to the armature A which is asymmetric in the longitudinal direction. Therefore, when performing the coupling, it is necessary to reliably determine the direction of the armature A, but the non-magnetic metal plate A ₁₁ that determines the direction is made of a metal such as phosphor bronze, and Since the armature A is plated with metal such as nickel, it is often difficult to identify these metals with a normal visual sensor, so it is difficult to perform automatic assembly. It takes time and effort.

In consideration of the wear of both ends A ₈ and A ₉ when the number of times that the armature A is suctioned and released from the iron core increases, one end A ₈ may be made of, for example, phosphor bronze. It is good because the non-magnetic metal plate A _{11 which} is relatively hard to wear is fixed,
The other end portion A ₉ is After peeling the metal plating such as nickel surface material becomes easily worn because it is relatively soft magnetic material such as electromagnetic soft iron.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electromagnetic relay capable of easily and automatically identifying the direction of an armature.

[0011]

According to another aspect of the present invention, there is provided an electromagnetic relay according to the first aspect of the present invention, wherein an iron core on which a coil is wound and a shaft provided at a substantially central portion in a longitudinal direction are provided on one side. The non-magnetic metal plate is fixed on the suction surface of the one end to the iron core so that the other end is always attracted to the iron core when the coil is in the non-excited state while being rotatably supported on the side. A substantially plate-shaped armature having directivity, and a movable contact spring directionally coupled to the other surface of the armature so that the movable contact moves toward and away from the fixed contact in response to the armature And
In an electromagnetic relay in which the armature is provided with a coating part made of abrasion-resistant resin on one surface side including the shaft part, the coating part does not cover at least the non-magnetic metal plate with respect to the longitudinal direction of the armature. The configuration is such that the asymmetric shape is provided.

Further, the electromagnetic relay according to the present invention is configured such that the coating portion is provided including the other end of the armature.

[0013]

According to the electromagnetic relay of the first aspect, the coating portion made of abrasion-resistant resin is provided so as to be asymmetric with respect to the longitudinal direction of the armature without covering at least the nonmagnetic metal plate. However, this abrasion-resistant resin can be made identifiable with a visual sensor, for example, by coloring it in black, so that the direction of the armature can be easily adjusted automatically by using the coating part to prevent abrasion of the shaft part. Can be identified.

Further, according to the electromagnetic relay of the present invention, when the armature is attracted and released from the iron core by a large number of times, the wear at both ends is considered. A non-magnetic metal plate such as phosphor bronze, which is relatively hard to wear, is fixed, and a coating portion made of a wear-resistant resin is provided at the other end, so that both ends are hard to wear.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes an iron core, which is formed of a magnetic material and has a substantially U-shape having opposed magnetic pole pieces 1a and 1b, and a coil 1c is wound around a central piece via a coil frame 1d. .

Reference numeral 2 denotes an armature, which is formed in a substantially rectangular flat plate shape from a magnetic material such as electromagnetic soft iron, and is plated with metal such as nickel. Shafts 2a and 2b having curved surfaces 2c and 2d, respectively, are provided on the side 2e, and two circular stamps are formed on one side 2e on both sides of a center line connecting the shafts 2a and 2b. Trace 2g, 2
By providing g, two circular projections 2h, 2h are formed on the other surface 2f side at positions opposite to those. This shaft part 2a, 2b
The curved surface portions 2c, 2d of the armature 2 are rotatably supported, and the armature 2 has both ends 2i, 2j alternately attracted and released to the magnetic pole pieces 1a, 1b of the iron core 1. Curved surface part
2c and 2d are polyethylene fluoride fibers which are abrasion resistant resin
(Trade name Teflon) is colored black and coated.

In this case, the coating portion 2k to be coated with Teflon is provided on the entire surface on one surface 2e side, including the curved surface portions 2c and 2d, except for one end 2i to which a non-magnetic metal plate 2m described later is fixed. That is, it is formed in an asymmetric shape with respect to the longitudinal direction of the armature 2 so as not to cover the nonmagnetic metal plate 2m, and has a directionality. In the procedure, so-called masking is performed on one end 2i on one surface 2e side in a state where a plurality of armatures 2 are arranged with one adjacent shaft 2a and the other shaft 2b in contact with each other. After spraying and spraying Teflon, the masking is removed and formed.

The armature 2 has a nonmagnetic metal plate 2m such as phosphor bronze fixed to one surface 2e of the one end 2i where the coating 2k is not provided. When the one end 2i is attracted to one pole piece 1a of the iron core 1, the nonmagnetic metal plate 2m has a coil formed on the suction surface by the thickness of the nonmagnetic metal plate 2m. When one is in a non-excited state, its one end 2i is always released from the pole piece 1a, and the other end 2j is attracted to the other pole piece 1b of the iron core 1. For the operation of.

Reference numeral 3 denotes a movable contact spring, which is provided with movable contacts 3a at both ends in a twin shape using a leaf spring material such as phosphor bronze, and a spring support 3c at one side of a central portion 3b connecting the both ends. Is formed. The center portion 3b of the movable contact spring 3 is provided with two coupling holes.
The two coupling holes are caulked and coupled to two circular protrusions 2h, 2h provided on the other surface 2f side of the armature 2. When this coupling is performed, the spring support 3c of the movable contact spring 3 is connected to one shaft 2a of the armature 2.
The movable contact spring 3 must be directionally connected to the armature 2 which is asymmetric in the longitudinal direction.

Reference numeral 4 denotes a permanent magnet which is formed in a flat plate shape and has an iron core.
Both ends inserted between the two magnetic pole pieces 1a and 1b are magnetized to the same polarity S pole, and the center is magnetized to the different polarity N pole.

Reference numeral 5 denotes a base, which is formed in a substantially box shape by a molding material such as a synthetic resin, has a fixed contact 5a at one end on one of the opposed side walls, and has the other end led out. Contact terminals 5b are provided at both ends, and a common connection portion 5c is provided at one end.
The common terminal 5d having the other end and extending to the outside is provided at the center, and a coil terminal 5e is provided on the other side wall. In the middle recess, an insulating wall 5f is erected, and a coil chamber 5g and a contact chamber 5h are formed on both sides thereof.
Above the inner surface side of the side wall provided with the contact chamber 5h side of 5f and the common connection portion 5c, bearing portions 5i and 5j having a substantially semicircular concave shape are formed respectively.

The coil frame 1d is fitted in the coil chamber 5g, the permanent magnet 4 and the armature 2 are fitted in the contact chamber 5h, and the movable contacts 3a provided at both ends of the movable contact spring 3 are fitted. The spring support portion 3c of the movable contact spring 3 is electrically connected to the common connection portion 5c so that the fixed contact 5a can be brought into contact with and separated from the fixed contact 5a, and the shaft portions 2a and 2b of the armature 2 have the curved surface portions 2c and 2d as bearing portions. 5i, 5j
Is supported rotatably.

Reference numeral 6 denotes a case, which is formed in a substantially box shape by a molding material such as a synthetic resin and is fitted to the base 5.

Next, the operation will be described. When the coil 1c is excited in a predetermined direction to magnetize the magnetic pole pieces 1a and 1b of the iron core 1 to S and N poles respectively, both ends of the permanent magnet 4 inserted between the pole pieces 1a and 1b are S poles. Since the central portion is magnetized to the N pole, the magnetic flux of the coil 1c and the permanent magnet 4 flows in the same direction between the one end 2i of the armature 2 and the one pole piece 1a of the iron core 1. As a result, the armature 2 operates with the shaft portions 2a and 2b rotatably supported by the bearing portions 5i and 5j, and one movable contact 3a contacts the fixed contact 5a. At this time, since the nonmagnetic metal plate 2m is fixed to the one end 2i, a gap is formed on the suction surface by the thickness of the nonmagnetic metal plate, and the magnetic resistance is increased. Therefore, when the coil is de-energized, the armature 2 has one end 2i released from one pole piece 1a and the other end 2j attracted and held by the other pole piece 1b by the magnetic flux of the permanent magnet 4. And performs a so-called monostable operation.

In such an electromagnetic relay, in order to perform a monostable operation, the armature 2 has a direction with a non-magnetic metal plate 2m fixed to one end 2i.
Also, since the spring supporting portion 3c is formed on one side of the central portion 3b and has directionality, it is necessary to reliably identify the direction of the armature 2 when the movable contact spring 3 is coupled to the armature 2. There is a coating part 2k made of abrasion resistant resin colored black
However, since the shaft portions 2a and 2b are provided so as not to cover the nonmagnetic metal plate 2m and to be asymmetric with respect to the longitudinal direction of the armature 2, the coating portion 2k is worn by the shaft portions 2a and 2b. In addition, the direction of the armature 2 can be easily and reliably identified by automatically recognizing the black color with a visual sensor.

Further, when the number of times that the armature 2 is attracted and released to the magnetic pole pieces 1a and 1b of the iron core 1 increases,
Considering the wear of 2i, 2j, a non-magnetic metal plate 2m, such as phosphor bronze, which is relatively hard to wear, is fixed to one end 2i, and the other end 2j is coated with a wear-resistant resin. Part 2k
Is provided, both ends 2i, 2j are hardly worn, and the life is prolonged accordingly.

Further, the second armature 2 provided on the other surface 2f side of the armature 2
When crimping the two coupling holes of the movable contact spring 3 to the two circular projections 2h, 2h, the diameter is adjusted to the two circular concave dents 2g, 2g provided on the one surface 2e side of the armature 2. The round projections 2h, 2h are press-fitted from the other surface 2f side to be joined by caulking the round pins 2h and 2h into a receiving jig. At this time, for example, as shown in FIG. If both ends of the width of the coating part are halfway on the concave dent, the inner diameter of the concave dent will vary, and the receiving jig of the round pin will not fit securely and caulking will be unstable On the other hand, in the present embodiment, as shown in FIG. 1, since the coating portion 2k is provided so as to completely include the concave dents 2g, 2g, there is no variation in the inner diameter of the concave dents 2g. Thus, the receiving jig of the round pin is securely fitted and the caulking connection is also stabilized.

In this embodiment, the coating portion 2k
Is formed by coloring the wear-resistant resin in black, but the color may be appropriately set so that it can be identified according to the type of the visual sensor.

In this embodiment, the coating portion 2k
Is provided on the entire surface on the one surface 2e side so as not to cover the nonmagnetic metal plate 2m fixed to one end 2i of the armature 2, but includes the shaft portions 2a and 2b and at least includes the nonmagnetic metal plate. 2m
As long as the armature is formed in an asymmetric shape with respect to the longitudinal direction without covering, the direction of the armature 2 can be easily and automatically identified by a visual sensor.Therefore, the coating 2k is not necessarily provided at the other end 2j. It is not necessary.

[0031]

According to the electromagnetic relay of the first aspect, the coating portion made of abrasion-resistant resin is provided so as to be at least asymmetric with respect to the longitudinal direction of the armature without covering the nonmagnetic metal plate. However, this abrasion-resistant resin can be made identifiable by a visual sensor, for example, by coloring it in black, etc. Can be automatically identified.

Further, according to the electromagnetic relay of the second aspect, in consideration of wear at both ends when the number of times the armature is attracted and released to the iron core increases, for example, one end is provided with A non-magnetic metal plate such as phosphor bronze which is relatively hard to wear is fixed, and the other end is provided with a coating made of wear-resistant resin, so that both ends are hard to wear. , It can prolong the life.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of an embodiment of the present invention.

FIG. 2 is a plan view of a main part of the above.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is an exploded perspective view of the same.

FIG. 5 is a perspective view of a main part showing a conventional example.

[Explanation of symbols]

 1 Iron core 1c Coil 2 Armature 2a Shaft 2b Shaft 2e One side 2f Other side 2i One end 2j Other end 2k Coating 2m Non-magnetic metal plate 3 Movable contact spring 3a Movable contact 5a Fixed contact

Claims (2)

(57) [Scope of request for utility model registration] 1. An iron core on which a coil is wound, and a shaft provided at a substantially central portion in a longitudinal direction are rotatably supported on one side, and the other end is always provided when the coil is in a non-excited state. A non-magnetic metal plate is fixed to the suction surface of the iron core at one end so that the part is attracted to the iron core. A movable contact spring directionally coupled to the other surface of the armature so that the contact comes into contact with or separates from the fixed contact, and the armature is abrasion-resistant to a portion on one surface including the shaft. An electromagnetic relay provided with a resin coating portion, wherein the coating portion is provided so as to be at least asymmetrical with respect to the longitudinal direction of the armature without covering the nonmagnetic metal plate. 2. The electromagnetic relay according to claim 1, wherein the coating portion is provided including the other end of the armature.