JPH09288957A - Electromagnetic relay and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure operation. SOLUTION: When this electromagnetic relay includes an iron core 1, a coil wound in order to form magnetic pole parts at the iron core 1, an armature attracted to and released from the magnetic pole parts of the iron core 1, and contact parts that open and close in response to the armature, at least either the iron core 1 or the armature is coated on its surface with a coating member 9 containing at least one resin, such as polyamide imide, polyimide, or polyether sulfone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay in which constituent parts such as an iron core are surface-treated.

[0002]

2. Description of the Related Art As a first conventional example of this type of electromagnetic relay, there is one having a structure shown in FIGS. This is an iron core A, a coil C wound around a coil bobbin B to form a magnetic pole portion A ₁ on the iron core A, and a magnetic path of a magnetic flux generated by energizing the coil C. Yoke D
And an armature E that is swingably supported by a yoke D and is attracted and released to the magnetic pole portion A ₁ of the iron core A, and a movable contact in response to the armature E.
A contact portion F in which F ₂ contacts and separates from the fixed contact F ₁ and a housing G made of a molding material that accommodates the contact portion F are provided.

More specifically, the iron core A of this electromagnetic relay is
The processing shown in FIG. 14 is performed. That is, punching into a predetermined shape, annealing, metal plating such as nickel plating under copper to form a first plating layer H _{1 made} of copper and a second plating layer H ₂ made of nickel, A coating member H ₃ containing polyparaxylene or the like is vacuum-deposited on the surface.

As a second conventional example of this type of electromagnetic relay, FIG.
There are configurations shown in FIGS. 15 to 20. This one is
Balanced amateur type with a coat on the surface
Member H_ThreeIs coated with central piece A_TwoAnd both legs A_Three, A
_FourAn approximately U-shaped iron core A consisting of_Three, A_FourEach
Of a pair of coil bobbins B, B formed integrally with the iron core A
Both legs A_Three, A_FourMagnetic pole part A at the tip of_Five, A₆To form
The winding space is restricted between the pair of coil bobbins B, B.
In the state, the center piece A of the iron core A_TwoCoil C wound around and longitudinal direction
Central axis E₀Is pivotably supported at both ends E₁, E_TwoIs an iron core
Both ends of A Magnetic pole part A_Five, A₆Armature to be released by suction
E and movable contact F in response to armature E_Three, F _FourIs a fixed contact
F_Five, F₆Both the contact part F and the iron core A
End magnetic pole part A_Five, A₆To the same pole and to magnetize the armature E to the opposite pole.
And a permanent magnet J, which
For adhesion to other members such as Hisamij J
Adhesive K consisting of is applied.

More specifically, the iron core A of this electromagnetic relay is
Similar to the iron core A of the electromagnetic relay of the first conventional example, the processing shown in FIG. 14 is performed. That is, punching into a predetermined shape,
Annealing is performed, metal plating such as nickel plating under copper is performed, and a coating member H ₃ containing polyparaxylene or the like is vacuum-deposited on the surface. The movable contacts F ₃ and F ₄ are provided at both ends of a movable spring L, which is integrally fixed to the armature E by a molded body L ₀ so that its central portion is along the longitudinal direction of the armature E. There is. Fixed contacts F ₅ and F ₆ are covered by cover G ₁
It is also provided on a base G ₂ which constitutes the housing G together with The supporting spring M protruding from the movable spring L in the lateral direction of the armature E is fixedly supported by the supporting portion G ₃ provided on the base G ₂ , and the central axis E ₀ Give a restoring force to.

[0006]

In the first conventional example of an electromagnetic relay described above [0008], by the armature E is sucked away to the magnetic pole portion A ₁ of the iron core A, the magnetic pole portion A ₁ of the iron core A Also, if the armature E becomes worn and the abrasion powder adheres to the contact F, contact failure may occur and the electromagnetic relay itself may not operate reliably.

Further, when an organic substance or the like formed at the time of contact and separation of the contact portion F based on the gas generated from the housing G made of a molding material adheres to the magnetic pole portion A ₁ and the armature E of the iron core A, There is a risk that the iron core A and the armature E will be fixed via the organic substance and will not operate, and the electromagnetic relay itself will not operate reliably.

In the electromagnetic relay of the second conventional example described above,
Is the coil C surface for adhesion with other members such as the permanent magnet J.
The adhesive L applied to the surface is hardened as shown by the arrow in Fig. 17.
During the aging process, the capillaries will be drawn along the gap between the coil bobbin B and the iron core A.
It moves due to a phenomenon, and during the transfer, it is divided into a main agent and a curing agent.
When separated, the separated main agent is magnetic pole part A_Five, A ₆
It oozes out on the surface of the iron core A that will become
The electromagnetic relay itself will not operate reliably.
There is a risk that.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electromagnetic relay that operates reliably.

[0010]

In order to solve the above-mentioned problems, according to a first aspect of the present invention, an iron core, a coil wound to form a magnetic pole portion on the iron core, and an iron core are provided. In an electromagnetic relay provided with an armature that is suction-released to a magnetic pole part, and a contact part that contacts and separates in response to the armature, at least one of the iron core or the armature has a polyamideimide or polyimide surface. Alternatively, a coating member containing at least one resin of polyether sulfone is coated.

According to a second aspect of the present invention, in the first aspect, there is provided a supporting member for swingably supporting the armature that is suction-released to the iron core. The support member is coated with the coating member.

According to a third aspect of the present invention, an iron core, a coil wound to form a magnetic pole portion on the iron core, an armature sucked and released to the magnetic pole portion of the iron core, and an armature. An electromagnetic relay comprising: a contact part that responds to and separates from the contact part, and a housing made of a molding material that houses the contact part, wherein the iron core and the armature each have a coating containing a fluororesin on the surface thereof. The member is coated.

According to a fourth aspect of the present invention, a substantially U-shaped iron core having a central piece and both leg pieces whose surface is coated with a coating member, and a pair of coil bobbins integrally formed on the both leg pieces of the iron core, respectively. A coil wound around the center piece of the iron core in a winding space formed by being regulated by a pair of coil bobbins to form magnetic pole portions at the ends of the two legs of the iron core; Armature to be released by suction to the department,
A contact portion that responds to and contacts an armature, and the coil is an electromagnetic relay in which an adhesive is applied to the surface of the coil for bonding with another member, wherein the coating member is
It is configured to contain a fluororesin.

According to the fifth aspect of the present invention,
In any one of 3 or 4, the surface is
It has a blasted structure.

[0016] According to a sixth aspect of the present invention, in the third aspect of the present invention, the fluororesin is polytetrafluoroethylene.

A seventh aspect of the present invention is the structure of the third or fourth aspect, wherein the coating member contains at least one additive resin of polyamideimide, polyimide or polyether sulfone. I am doing it.

The eighth aspect is the one according to the seventh aspect, wherein the coating member contains the added resin in an amount of 1 to 10 times that of the fluororesin. There is.

The method according to claim 9 is the method according to claim 1,
The manufacturing method for manufacturing the electromagnetic relay according to 3 or 4, wherein a solution in which the coating member is dissolved by an organic solvent is spray-painted on the surface that has been heated in advance in a heated state, and the coating member is baked and fixed. I am doing it.

[0019]

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

This electromagnetic relay includes an iron core 1, a coil bobbin.
2, 2, a coil 3, a yoke (support member) 4, an armature 5, a fixed contact plate 6, a movable spring 7, a housing 8, and a coating member 9.

As shown in FIG. 4, the iron core 1 is made of a magnetic material which is surface-treated to coat the coating member 9. This coating member 9 contains polytetrafluoroethylene which is a fluororesin and polyamideimide as an additive resin. More specifically, the coating member 9 contains 1 to 10 times as much polyamideimide as poly (polytetrafluoroethylene) which is polyamideimide. Incidentally, it is desirable to contain 3 to 5 times as much polyamideimide as polytetrafluoroethylene. This iron core
To describe the surface treatment of 1 in detail, punching into a predetermined shape, annealing, removal of burrs after punching, so-called barrel processing, blasting with silica powder, etc.
It is preheated to about 100 ° C, and a solution of coating member 9 dissolved in an organic solvent such as dimethylformamide is spray-painted on the preheated surface in a heated state, and the coating member 9 is baked and fixed at 200 ° C or higher. . In addition,
When removing burrs after punching by blasting, barreling does not have to be performed.

The coil bobbins 2, 2 are made of a molding material such as plastic and are formed in a disk shape, and are provided so that one end and the other end of the iron core 1 pass through. coil
3 is wound around the iron core 1 in a state where the winding space is restricted between the coil bobbins 2 and 2. By winding the coil 3 in this manner, the iron core 1 has the magnetic pole portion 1a formed at one end portion formed to have a large diameter, and constitutes the electromagnet 20 together with the coil 3.

The yoke (support member) 4 is made of a magnetic material which is surface-treated in the same manner as the iron core 1. The yoke 4 has one piece 4a and the other piece 4b, is formed by bending into an L-shape, and serves as a magnetic path of a magnetic flux generated when the electromagnet 20 is excited. On the other hand, in the piece 4a, the other end of the iron core 1 is fixed by penetrating, so that the electromagnet 20 is fixed in close contact with the coil bobbin 2. The other piece 4b has an iron core with its tip.
An armature (5) which is sucked and released by the magnetic pole portion (1a) of (1) is swingably supported.

The armature 5 is made of a surface-treated magnetic material like the iron core 1. This armature 5 has one piece 5a and the other piece 5b, and is formed by bending it into an obtuse L-shape. The inside corner of the bent portion is the tip of the other piece 4b of the yoke 4. Therefore, it is swingably supported.

The fixed contact plate 6 is made of a plate material such as a copper alloy, the base end of which is erected on the housing 8 and the fixed contact 6a is provided at the tip.

The movable spring 7 is made of a thin leaf spring material such as a copper alloy and is formed in a long shape. The base end portion of the movable spring 7 is one of the armatures 5.
It is stuck to 5a. When the electromagnet 20 is excited, the movable spring 7 attracts and releases the contact 5 to the magnetic pole portion 1a of the iron core 1 to contact and separate from the fixed contact 6a, thereby forming the contact portion 30 together with the fixed contact 6a. The movable contact 7a is provided at the tip.

The housing 8 is made of a molding material, and as described above, the fixed contact plate 6 is erected and accommodates the contact portion 30.

A second embodiment of the present invention will be described below with reference to FIGS. The members having substantially the same functions as those in the first embodiment are designated by the same reference numerals. This electromagnetic relay consists of iron core 1, coil bobbins 2,2, coil 3,
The armature 5 includes a movable spring 7, a housing 8, a coating member 9, a permanent magnet 10, and a support spring 11.

As in the first embodiment, the iron core 1 is made of a surface-treated magnetic material for coating a coating member 9 containing polytetrafluoroethylene which is a fluororesin and polyamideimide as an added resin. ,
The center piece 1b and the two leg pieces 1c, 1c are formed in a substantially U shape. This coating member 9 contains 1 to 10 times as much polyamideimide as polytetrafluoroethylene, as in the first embodiment. Incidentally, it is desirable to contain 3 to 5 times as much polyamideimide as polytetrafluoroethylene. The surface of the iron core 1 is processed similarly to the first embodiment.

The coil bobbins 2 and 2 are made of a molding material such as plastic and are formed integrally with the leg pieces 1c and 1c of the iron core 1 to form a pair. Coil 3
Is wound around the center piece 1b of the iron core 1 in the winding space regulated by the pair of coil bobbins 2, 2. By winding the coil 3 in this manner, the iron core 1 is fixed to both leg pieces 1c and 1c.
Magnetic poles 1d and 1e are formed at the tip of the
3 together with the electromagnet 20. Then, the surface of the coil 3 is coated with an adhesive S 2 for adhesion with other members such as the housing 8 and the permanent magnet 10.

Similar to the first embodiment, the armature 5 is made of a surface-treated magnetic material for coating a coating member 9 containing polytetrafluoroethylene which is a fluororesin and polyamideimide as an additive resin. , Both ends 5c, 5d in the longitudinal direction are magnetic poles 1d, 1 at both ends of the iron core 1.
In order to be able to face e, it is formed in a substantially rectangular flat plate shape, and in the central portion on the one surface side, a pivotal ridge 5e having a semicircular convex cross section that can be fitted to a pivotal support portion 10a of the permanent magnet 10 described later, The center of the semicircle is provided so as to coincide with the central axis 5f in the longitudinal direction.

The movable spring 7 is formed of a thin leaf spring material such as a copper alloy into a long shape, and has a movable contact 7b at the tip thereof.
On the other hand, the movable contacts 7c are fixed to the tips of the armatures.
In each of the two sides of the armature 5 in the width direction, the central part partially cut out in the width direction is fixedly supported by an insulator 7d integrally molded to cover the center part of the other side of the armature 5 It is installed side by side substantially parallel to the longitudinal direction of 5.

The housing 8 comprises a base 81 and a cover 82. The base 81 is made of a resin material and is formed into a rectangular box shape with one side open. Fixed contacts 81a are provided at two corners on one end side in the longitudinal direction of the one side, and fixed contacts are provided at two corners on the other end side. 81b are provided respectively and their fixed contacts
The fixed terminal piece 81c connected to 81a, 81b, the coil terminal piece 81d connected to the coil 3, the supporting portion 81e provided in the recess at the center of both longitudinal sides on one side, and the common terminal piece 81f connected thereto are conductive. The plates are integrally formed.
The fixed contacts 81a, 81b described above are replaced by the movable contacts 7b, 7c.
Together with this, the contact portion 30 is formed. Like the base 81, the cover 82 is formed of a resin material in a box shape.

The permanent magnet 10 is formed in a substantially flat plate shape having a groove-shaped pivotal support portion 10a having a semicircular cross section at a central position on one surface side, and both end portions 10b and 10c in the longitudinal direction are both formed. N pole,
It is magnetized at three points so that the central part becomes the S pole, and both ends 10b, 10c
Are arranged so as to be located inside the magnetic pole portions 1d and 1e at both ends of the iron core 1, respectively.

The support springs 11 extend from the movable springs 7 provided on both sides of the armature 5 in the lateral direction of the armature 5, respectively.

Next, the assembled state of the above members will be described. On one side of the base 81, the coil 3 is connected to the coil terminal piece 81d and the iron core 1 is mounted,
10 is the both ends 10b, inside the magnetic poles 1d, 1e at both ends of the iron core 1.
10c are located and arranged. Next armature 5
Support springs 11 provided on both sides of the armature 5 are located on the central axis 5f of the armature 5 so that the pivotal support 5e provided in the center of the armature 5 fits into the pivotal support 10a of the permanent magnet 10. Welding position 11
A is spot-welded on the support 81e of the base 81 to form a weld at the welding position 11a. Thus, the movable spring
7 is a common terminal piece 81f led out from the supporting portion 81e to the outside.
The armature 5 is pivotally supported on the permanent magnet 10 so that the armature 5 can be swingably connected to both ends 5 of the armature 5.
The c and 5d are arranged so as to face the magnetic pole portions 1d and 1e at both ends of the iron core 1 so as to be respectively suction-released. And a box-shaped case 82
Are fitted on the sides of the base 81.

Next, the operation will be described. When the coil 3 is energized in the specified direction, one end 5c of the armature 5 is attracted to the one magnetic pole part 1d of the iron core 1 according to the direction of its magnetization, and the pivot bar 5e on the central shaft 5f causes the permanent magnet 10 to move. The movable contact 7b, which is pivotally supported by the pivotal support portion 10a of the movable spring 7a, responds to the armature 5 of the movable contact 7b and is a normally open side (NOmal side) so-called NO side contact provided at one end of the movable spring 7 and is a fixed contact. Contact 81a. Coil here
When power is applied to 3 in the opposite direction, the armature 5 has the other end 5d
The other end of the movable spring 7 is attracted to the other end magnetic pole portion 1e and oscillates in the reverse direction, and the movable contact 7c, which is a normally closed side (so-called NC side) contact provided on the other end of the movable spring 7, contacts the fixed contact 81b. Return to the state. In this way, this electromagnetic relay changes the energization direction of the coil 3 to move the movable contact 7b which is the NO side contact.
Contacts the fixed contact 81a, and the movable contact 7c, which is the NC side contact, contacts the fixed contact 81b.
It is a so-called bistable balanced amateur type that can swing freely around 5f as a fulcrum. Then, the spring force of the movable spring 7 and the support spring 11 acts as a spring load on the armature 5.

In the electromagnetic relay of the first embodiment, since the yoke 4 coated with the coating member 9 has high abrasion resistance, the armature 5 that is suction-released to the iron core 1 is used.
The armature is less likely to wear when swingably supported.
5 will operate reliably, and the electromagnetic relay itself will operate more reliably.

In the electromagnetic relay of the second embodiment, since the fluororesin contained in the coating member 9 coated on the surface of the iron core 1 has water repellent property and releasability, the other member is used. It is possible to prevent the adhesive S applied to the coil 3 to adhere to a certain permanent magnet 10 and the base 81 from moving along between the iron core 1 and the coil bobbin 2 due to a capillary phenomenon or the like. It is possible to prevent the armature 5 from operating steadily by exuding to the surface of the iron core 1 which becomes the parts 1d and 1e, and eventually to operate the electromagnetic relay itself.

In both the electromagnetic relays of the first and second embodiments, the polyamide-imide contained in the coating member 9 coated on both the iron core 1 and the armature 5 has a comparatively high abrasion resistance. Therefore, when the armature 5 is attracted and separated from the iron core, the magnetic pole part 1a and the armature 5 or the magnetic pole parts 1d and 1e and the armature 5 are less likely to be worn, and wear powder is reduced. The electromagnetic relay itself can operate reliably without being attached to the contact portion 30 and causing contact failure.

Further, since the fluororesin contained in the coating member 9 coated on the surfaces of the iron core 1 and the armature 5 has water repellency and releasability, it is generated from the housing 8 made of a molding material. Organic matter and the like formed when the contact part 30 is opened and closed based on gas does not adhere to the magnetic pole part 1a and the armature 5 of the iron core 1 or the magnetic pole parts 1d, 1e and the armature 5 of the iron core 1. Since the iron core 1 and the armature 5 are not fixed to each other through the organic substance, the armature 5 can be operated reliably, and the electromagnetic relay itself can be operated more reliably.

Further, since the coating member 9 is baked and fixed to the blasted surface, the adhesion between the surface and the coating member 9 can be improved.

Among the fluororesins, polytetrafluoroethylene has hydrogen atoms completely replaced by fluorine atoms and has a symmetrical structure, so that the water repellent property and releasability are extremely high. The height is high, and organic substances and the like are magnetic pole portion 1a of iron core 1 and armature 5 or magnetic pole portions 1d and 1e of iron core 1.
Also, since it does not adhere to the armature 5, the electromagnetic relay itself operates more reliably.

Further, the added resin called polyamide-imide has relatively high heat resistance, so that the heat resistance is improved. Therefore, it is possible to deal with UL / B type to H type with a margin, and surface mounting accompanied by SMD processing is also possible.

Since the added resin called polyamide-imide has an insulating property, the coil 3 can be wound directly. Therefore, in order to ensure insulation when the coil 3 is wound, it is not necessary to wind the coil 3 through an insulating member made of a separate member such as a molded product or a tape, and therefore the insulating member is not provided. Since a large winding space can be secured and the number of windings of the coil 3 can be increased, the magnetic efficiency can be improved.

By coating the coating member 9 containing 1 to 10 times the amount of polyamide-imide with respect to polytetrafluoroethylene, the properties of both polyamide-imide and poly-tetrafluoroethylene can be sufficiently satisfied. Therefore, the electromagnetic relay itself can operate more reliably.

Further, by spray-coating a solution in which the coating member 9 is dissolved with an organic solvent in a heated state on the preheated surface, the coating member 9 having a uniform film thickness can be baked and fixed to adhere. The electromagnetic relay itself will operate more reliably.

Further, all of the iron core 1, the armature 5 and the yoke 4 are coated with the coating member 9 on their surfaces, so that when the housing 8 is filled with nitrogen or the like, the contact portion 30 is Nitrogen oxides generated by contact and separation prevent corrosion.

Further, unlike the conventional example, since the plating process is not performed, it is not necessary to process the waste liquid such as the plating liquid.

Although the iron core 1 and the armature 5 are coated with the coating member 9 in the first embodiment, for example, when wear of the iron core 1 and the armature 5 can be reduced, Only one of them may be coated, in which case the production of either the iron core 1 or the armature 5 becomes easier.

In the first embodiment, the armature 5 is swingably supported by the yoke 4, but a support member coated with the coating member 9 is provided separately from the yoke 4, and Even when the support member is swingably supported, it is possible to reduce wear when swingably supporting the support member.

In each of the first and second embodiments, the yoke 4 is coated with the coating member 9, but for example, the armature 5 which is sucked and released by the iron core 1 is swingably supported. If the wear is relatively low, it may be uncoated, which makes the yoke 4 easier to manufacture.

In each of the first and second embodiments, the surfaces of the iron core 1, the armature 5 and the yoke 4 are blasted, but they need not be blasted.

Although polytetrafluoroethylene is used as the fluororesin in both the first and second embodiments, other fluororesins may be used.

In each of the first and second embodiments, polyamideimide is used as the added resin, but polyimide or polyether sulfone may be used.
Further, a mixture of these added resins may be used.

In each of the first and second embodiments, the coating member 9 contains 1 to 10 times the amount of the added resin with respect to the fluororesin, but the ratio is not limited to this.

In each of the first and second embodiments, the solution in which the coating member 9 is dissolved is spray-painted on the preheated surface in a heated state. However, by immersing each member in the solution, It may be applied or may be applied with a brush.

[0058]

According to the first aspect of the present invention, the polyamide imide, polyimide or polyether sulfone contained in the coating member coated with at least one of the iron core and the armature has relatively high abrasion resistance. Therefore, the magnetic pole part and the armature are less likely to be worn when the armature is attracted and separated from the iron core, and the abrasion powder does not adhere to the contact part to cause poor contact, The electromagnetic relay itself will operate reliably.

According to a second aspect of the present invention, in addition to the effect of the first aspect, the support member coated with the coating member has high abrasion resistance, so that the armature is suction-released to the iron core. The wear when swingingly supporting the armature is reduced, the armature operates reliably, and the electromagnetic relay itself also operates reliably.

According to the third aspect of the present invention, since the fluororesin contained in the coating member coated on the surface of the iron core and the armature has water repellent property and releasability, the housing made of a molding material is used. Organic matter, etc., formed when the contact part is opened and closed based on the generated gas does not adhere to the magnetic pole part and armature of the iron core, so the iron core and armature are fixed through the organic matter. Is eliminated, the armature can operate reliably, and by extension, the electromagnetic relay itself can operate reliably.

According to the fourth aspect, since the fluororesin contained in the coating member coated on the surface of the iron core has water repellent property and releasability, the coil for adhering the coil to another member is It is possible to prevent the adhesive from moving along the space between the iron core and the coil bobbin due to capillary phenomenon, etc. Then, the electromagnetic relay itself will operate reliably.

According to a fifth aspect of the present invention, in addition to the effect of any one of the second, third or fourth aspects, the coating member is baked and adhered to the blasted surface so that the surface and the coating member are It is possible to improve the adhesion.

In the polytetrafluoroethylene according to the sixth aspect, among the fluororesins, the hydrogen atoms are completely replaced by the fluorine atoms, and the polytetrafluoroethylene has a symmetrical structure. And the releasability is extremely high, and the effect of any one of claims 3 and 4 can be further enhanced.

The resin according to claim 7 has a relatively high heat resistance in any of the polyamideimide, polyimide and polyether sulfone added resins. Also, the heat resistance is improved.

According to the eighth aspect of the present invention, by coating a coating member containing 1 to 10 times as much polyamideimide as polytetrafluoroethylene, both polyamideimide and polytetrafluoroethylene are coated. Since each of the characteristics can be sufficiently exhibited, the effect of the invention described in claim 7 can be further enhanced.

According to the method described in claim 9, since the coating member having a uniform film thickness can be fixed by firing and adhered, the effect of the invention described in claim 1, 3 or 4 can be further enhanced.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of an iron core according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a partial sectional view of the above.

FIG. 4 is a process explanatory view showing the surface treatment method of the iron core of the above.

FIG. 5 is an exploded perspective view of a second embodiment of the present invention.

FIG. 6 is a plan sectional view of the above.

FIG. 7 is a sectional view taken along line YY of FIG. 6;

FIG. 8 is a perspective view of the iron core of the above.

FIG. 9 is a partial cross-sectional view of the iron core of the above.

FIG. 10 is a perspective view showing a state in which a coil is wound around the iron core of the above.

FIG. 11 is a perspective view of a first conventional example.

FIG. 12 is a sectional view of the above.

FIG. 13 is a partial cross-sectional view of the iron core of the above.

FIG. 14 is a process explanatory view showing the surface treatment method for the iron core of the above.

FIG. 15 is an exploded perspective view of a second conventional example.

FIG. 16 is a plan sectional view of the above.

FIG. 17 is a sectional view taken along line XX of FIG. 16;

FIG. 18 is a perspective view of the iron core of the above.

FIG. 19 is a partial cross-sectional view of the iron core of the above.

FIG. 20 is a perspective view showing a state in which a coil is wound around the iron core of the above.

[Explanation of symbols]

 1 Iron core 1a Magnetic pole part 1b Center piece 1c, 1c Leg piece 1d, 1e Magnetic pole part 2 Coil bobbin 3 Coil 4 Yoke (support member) 5 Armature 8 Housing 9 Coating member 30 Contact part S adhesive

Claims (9)

[Claims] 1. An iron core, a coil wound to form a magnetic pole portion on the iron core, an armature that is sucked and released to the magnetic pole portion of the iron core, and a contact point that contacts and separates in response to the armature. In the electromagnetic relay comprising a part, at least one of the iron core or the armature has a surface coated with a coating member containing at least one resin of polyamide imide, polyimide or polyether sulfone. The characteristic electromagnetic relay. 2. A support member for swingably supporting the armature sucked and released to the iron core is provided, and the support member is coated with the coating member. The electromagnetic relay according to claim 1. 3. An iron core, a coil wound to form a magnetic pole portion on the iron core, an armature that is attracted and released to the magnetic pole portion of the iron core, and a contact that contacts and separates in response to the armature. And a housing made of a molding material for accommodating the contact portion, wherein the iron core and the armature are both coated with a coating member containing a fluororesin. And electromagnetic relay. 4. A substantially U-shaped iron core having a central piece and both leg pieces whose surface is coated with a coating member, a pair of coil bobbins integrally formed on the both leg pieces of the iron core, and both of the iron core leg pieces. A coil wound around a central piece of an iron core in a winding space formed by being regulated by a pair of coil bobbins to form a magnetic pole portion at the tip portion, and an armature that is attracted and released to the magnetic pole portion of the iron core. And a contact portion that moves in contact with and separates from the armature, wherein the coil is an electromagnetic relay to which an adhesive is applied for adhering to another member, wherein the coating member is a fluororesin. An electromagnetic relay characterized by containing. 5. The electromagnetic relay according to claim 1, wherein the surface is blasted. 6. The electromagnetic relay according to claim 3, wherein the fluororesin is polytetrafluoroethylene. 7. The electromagnetic relay according to claim 3, wherein the coating member contains at least one additive resin of polyamide imide, polyimide or polyether sulfone. 8. The electromagnetic relay according to claim 7, wherein the coating member contains the additive resin in an amount of 1 to 10 times that of the fluororesin. 9. A manufacturing method for manufacturing the electromagnetic relay according to claim 1, 3 or 4, wherein a solution in which the coating member is dissolved by an organic solvent is sprayed on the surface which has been heated in advance in a heated state. A method for manufacturing an electromagnetic relay, which comprises coating and baking and fixing the coating member.