JP2000195400A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve heat resistance in an electromagnetic relay with respect to use it in a high-temperature atmosphere, e.g. to mount it by the use of high- melting point solder, or to use it for an on-vehicle device. SOLUTION: This electromagnetic relay has an electromagnet, a magnetic circuit and a set of contact springs. Swinging of an armature 25 in the magnetic circuit swings moving contact springs 632 of the contact spring set, while moving contacts 13 are contacted with or separated from fixed contacts 654 (or 655) of the contact spring set by the swinging of the moving contact springs 632. A middle part of the moving contact spring 632 is formed with a metal protrusion 633 projecting towards the armature 25 and functioning as a medium for transmitting the swinging of the armature 25 to the moving contact spring 632, while an insulating layer 643 is formed on a prescribed part of the armature 25 which abuts on the metal protrusions 633.

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 better heat resistance than conventional ones, and more particularly to an electromagnetic relay which uses a high-temperature solder at the time of mounting and has excellent resistance to high temperatures in an atmosphere.

In recent years, the use of magnetic relays incorporated in in-vehicle equipment has been expanded and the amount of use has been increasing due to the pursuit of luxury, comfort and safety of automobiles. These electromagnetic relays have been reduced in size and heat resistance. There is a demand for higher capacity, and a new configuration that meets the demand is being pursued.

[0003]

2. Description of the Related Art FIG. 5 is a perspective view in which a conventional electromagnetic relay is exploded into main parts, 1 is a movable contact block, 2 is an electromagnet block, 3 is a base, 4 is an armature recovery spring,
Is a pair of fixed terminals.

[0004] The movable contact block 1 is formed by inserting an intermediate portion of a pair of movable contact springs 12 into an insulator 11 formed by molding a resin into a substantially U-shape. A movable contact 13 is fixed to the upper and lower surfaces of the distal end portions of the pair of movable contact springs 12, and an insulating member 14 made of resin is formed on an intermediate portion between the movable contact 13 fixed portion and the insert portion. A pair of through holes 1 are formed in the insulator 11 to be mounted on the base 3.
5 and one vertical groove 16 are formed.
2 has a rear end protruding rearward of the insulator 11, and the insulator 11 and the insulating member 14 are generally made of PBT resin (polybutylene terephthalate) having excellent moldability, electrical characteristics, and mechanical characteristics.

The electromagnet block 2 comprises a bobbin 21 made of insulating resin, a coil 22 wound around the bobbin 21, and an iron core 23 penetrating through the center of the bobbin 21 and only the front end is visible.
And a yoke 24 having a substantially L shape, an armature 25 having a substantially L shape, and a pair of coil terminals 26 for connecting windings of the coil 22.

The front end of the iron core 23 is fixed to the vertical piece 24a in front of the yoke 24 by caulking, and the vertical piece 24a is connected to the front flange 21 of the bobbin 21.
a so as to be buried in the concave portion of FIG. Such a yoke 24
Has a pair of projecting pieces 24b projecting sideways from an intermediate portion, and the pair of projecting pieces 24b is provided with a through hole 24c for fixing the yoke 24 to the base 3.

The armature 25 in which the bent portion abuts on the rear end of the yoke 24 and the vertical piece is hidden and invisible has a T-shaped portion along the upper surface of the yoke 24, and the T-shaped tip portion 25a.
A pin-like projection 25b into which the through hole 4a provided in the armature recovery spring 4 fits protrudes upward in the middle of the L-shaped bent portion. The armature recovery spring 4 having three elastic projections fits the through-hole 4b formed in the flat plate portion with the pin-shaped projection 36 of the base 3.

[0008] The vertical part of the amateur 25 (not shown)
The rear end portion of the iron core 23 is opposed to the rear end portion of the iron core 23 with an appropriate gap, and the vertical piece is attracted or sucked to the rear end portion of the iron core 23 by flowing or cutting off the current to the coil 22 and the urging force of the armature urging spring 4. The bobbin 21
Is made of a PBT resin having excellent moldability, electrical characteristics, and mechanical characteristics, and the coil terminal 26 uses a nickel-white wire having a diameter of about 0.7 mm.

The pair of fixed terminals 51 and 5 are made of insulating resin.
The base 3 into which the electromagnet block 2 has been inserted has a concave portion 31 for accommodating the electromagnet block 2 and a pair of fixed terminals 53 and 5 which have not been inserted.
4 and the insulator 1
1 and a pair of pin-shaped protrusions 34 for fixing the yoke 24, a pair of pin-shaped protrusions 35 for fixing the insulator 11, and a pin-shaped protrusion 36 for mounting the armature 4 and positioning the insulator 11. And a pair of through holes 3 for projecting the pair of coil terminals 26 on the bottom surface of the concave portion 31.
7 (only one is visible in the figure), and a pair of fixed terminals 5 for the movable contact spring connected to the movable contact spring 12.
5 and 56 are planted.

Fixed contacts 57 are fixed to the tips of the fixed terminals 51 to 54. A pair of fixed contacts 57 fixed to the fixed terminals 51 and 52 and a pair of fixed contacts 57 fixed to the fixed terminals 53 and 54, respectively. The contacts 57 are vertically opposed at appropriate intervals, and the movable contacts 13 fixed to each of the pair of movable contact springs 12 are inserted between the opposed contacts. Then, the movable contact 13 comes into contact with the upper or lower fixed contact 57 by the operation of the armature 25, that is, by flowing or cutting off the current to the coil 22.

[0011]

In the above-described conventional electromagnetic relay, the conventional electromagnetic relay may be used in a relatively high temperature atmosphere such as an in-vehicle device, or may be higher in temperature than a normal one depending on use conditions. It is desirable to use a high-temperature solder having a higher melting point than the above-mentioned solder, that is, a high-temperature solder having a melting point of about 185 ° C. to 300 ° C.

The conventional electromagnetic relay has a movable contact spring 1 for heat resistance and a long service life of 10 million times or more for the above-mentioned applications.
The insulating member 14 which is in contact with the armature 25 due to the spring pressure of 2 softens during use, and sometimes softens close to a molten state, losing electrical insulation between the movable contact spring 12 and the armature 25, or using high-temperature solder during mounting. And the high temperature of the use atmosphere softens the bobbin 21, thereby loosening the coil terminal 26, and removing the coil terminal 26 and the coil 2.
There has been a problem that a disconnection may occur between the two.

The contact surface (lower surface) 14a of the insulating member 14 that contacts the tip 25a of the armature 25 is generally spherical, and the contact surface 14a slides on the tip 25a. As the simplest solution to the above-mentioned problem due to the softening of the resin 14, the use of a heat-resistant plastic for the insulating member 14 can be considered.

However, even if a heat-resistant plastic that can be molded is used for the insulating member 14 instead of the conventional PBT, the generally known heat-resistant plastic is heated for several tens of minutes (one of the softening temperature of the plastic used). (Approximately / 2 continuous heating), deformation due to creep occurs, and smooth sliding with the arm tip 25a is impaired, and contact bounce occurs, which is inappropriate.

[0015]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide an electromagnetic relay capable of withstanding a high-temperature atmosphere and a use condition of a vehicle-mounted device or the like.

A first electromagnetic relay of the present invention corresponding to the above object comprises an electromagnet, a magnetic circuit, and a contact spring set, and the movable contact spring of the contact spring set swings by the swing of the armature of the magnetic circuit. And, in the electromagnetic relay in which the fixed contact and the movable contact of the set of contact springs are closed or opened by the swing of the movable contact spring, an intermediate portion of the movable contact spring projects toward the armature and is protruded toward the armature. A metal projection serving as a medium for transmitting the swing to the movable contact spring is provided, and an insulating layer is provided at a predetermined portion of the armature where the metal projection contacts.

According to a second electromagnetic relay of the present invention corresponding to the above object, in the first electromagnetic relay of the present invention, the insulating layer is a ceramic coating layer.

According to a third electromagnetic relay of the present invention corresponding to the above object, in the first electromagnetic relay of the present invention, the insulating layer is a baked layer of a fluorine resin.

According to a fourth electromagnetic relay of the present invention corresponding to the above object, in the first electromagnetic relay of the present invention, the coil terminal implanted on the bobbin of the electromagnet for connection to the coil of the electromagnet is provided at an intermediate portion. Is bent, and at least a part of the bent portion is inserted into the bobbin.

[0020] The first electromagnetic relay of the present invention is a PBT.
Metal protrusions are provided in place of the conventional insulator 14 made of resin, and an insulating layer is provided at a predetermined portion of the armature to which the metal protrusions abut. An electromagnetic relay that can withstand long-term use can be provided.

In the second electromagnetic relay of the present invention, as the insulating layer formed on the amateur, a ceramic having excellent heat resistance is limited, and the ceramic is also excellent in abrasion resistance. Will be guaranteed.

In the third electromagnetic relay of the present invention, the conductive insulating layer formed on the amateur is made of a fluorine resin having excellent heat resistance, and the present invention is directed to the second electromagnetic relay of the present invention using a ceramic. The formation of an insulating layer is easier than an electromagnetic relay.

According to the fourth electromagnetic relay of the present invention, in addition to the first electromagnetic relay of the present invention, even if the bobbin is softened, the coil terminals are hardly removed.

[0024]

FIG. 1 is a perspective view of an electromagnetic relay according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the electromagnetic relay of FIG. 1 in a main part, and FIG. 3 is a movable contact in the electromagnetic relay of FIG. FIG. 4 is an explanatory view of a spring and an amateur insulating layer, and FIG. 4 is an explanatory view of a coil terminal in the electromagnetic relay of FIG.

In FIG. 1, an electromagnetic relay 61 has a movable contact block 63, an electromagnet block 64, a fixed contact unit 65, and an armature recovery spring (not shown: see FIG. 2) 66 mounted on a base 62 made of PBT resin. Alternatively, the lead portion of the fixed contact terminal, the lead portion of the movable contact spring, and the lead portion of the coil terminal hang down.

In FIG. 2, a box-shaped base 62 for accommodating an electromagnet block 64 is the same PBT as the conventional base 3.
A pair of pin-shaped projections 622 for mounting the movable contact block 63, the electromagnet block 64, and the fixed contact unit 65, and a spring 66 for positioning the movable contact block 63 and restoring the armature. Of the movable contact block 63, the electromagnet block 64 and the fixed contact unit 65 on the upper surface.
Are formed on the concave and convex portions to which the predetermined portions are fitted.

In FIG. 2, the movable contact block 63 is made of an insulator 631 made of the same PBT resin as the conventional insulator 11.
, A middle portion of a pair of movable contact springs 632 is inserted, and a movable contact spring 63 from which a lead portion 632b hangs.
The second movable part 632a includes the movable contact 13 and the metal protrusion 633.
Having.

The metal projection 633 at the middle of the movable portion 632a of the movable contact spring 632 is connected to the movable portion 632 as shown in FIG.
Various metals such as iron, copper, brass, or nickel silver can be used.

The movable contact 13 projects above and below the tip of the movable portion 632a. The metal projection 633 fixed by ordinary means, for example, caulking, has a dome-shaped head projecting downward. 62, a pair of through holes 634 and a vertical groove 635 for fixing to the insulator 6.
On the lower surface of the base 31, there are formed projections and recesses to be fitted when the base 31 is overlaid.

In the figure, a pin-shaped projection 622 of the base 62 is fitted into a pair of through holes 634 provided in the insulator 631, and a groove 635 extending in the vertical direction is fitted in the base 62.
Are fitted. Then, the through hole 634
The tip of the pin-shaped projection 622 into which is fitted is caulked, and the movable contact block 63 is fixed to the base 62.

In FIG. 2, an electromagnet block 64 is a bobbin 641 made of the same PBT resin as the conventional bobbin 21.
And the coil 22 wound around the bobbin 641 and the bobbin 64
1 has a core 23 penetrating through the center, a substantially L-shaped yoke 24, a substantially L-shaped armature 25, and a pair of coil terminals 642 for connecting windings of the coil 22.

The front end of the iron core 23 is fixed by caulking to the vertical piece 24a in front of the yoke 24, and the vertical piece 24a is connected to the front flange 6 of the bobbin 641.
41a so as to be buried in the concave portion.

The intermediate portion of the yoke 24 is provided with a pair of projecting pieces 24b projecting sideways.
4 is fixed to the base 62, that is, the through hole 24c in which the pin-shaped protrusion 622 of the base 62 is fitted.
Has been opened.

The armature 25 whose bent portion abuts on the rear end of the yoke 24 and whose vertical piece is hidden and invisible has a T-shaped portion along the upper surface of the yoke 24, and a T-shaped tip corresponding to a pair of metal projections 633. An insulating layer 643 is formed on the upper surface of the portion 25a, and a protrusion 644 corresponding to the through hole 66e of the armature spring 66 is provided in the middle of the T-shaped portion.

The insulating layer 643 provided on the amateur 25
Since it is necessary to withstand 10 million operations required for the electromagnetic relay 61, that is, to prevent the electrical insulation from being lost even if the metal projection 633 is brought into contact with the electromagnetic projection 61 more than 10 million times, ceramic is deposited or a fluorine resin is used. (For example, polytetrafluoroethylene) was formed by baking or the like, and the thickness was set to 10 μm or more.

The vertical portion of the armature 25 (not shown) faces the rear end of the iron core 23 with an appropriate gap.
The vertical piece is caused to flow or cut off the current to the coil 22 and the urging force of the armature recovery spring 66 causes the iron core 2 to move.
3 is attracted or separated at the rear end.

As shown in FIG. 4, a pair of coil terminals 642 whose intermediate portions are offset-bent are inserted into the rear flange 641b of the bobbin 641, and the coil terminals 642 using a nickel-white wire having a diameter of about 0.7 mm are offset from the offset. The lead portion 642a from the bent portion is the rear flange 6
41b is exposed to the side, and the middle part thereof is the groove 6 of the base 62.
24.

In FIG. 2, an armature recovery spring 66 is provided.
The central projection 6 is formed by projecting the projections 66b, 66c, and 66d from the flat plate portion 66a in the same direction, and bending the projection into a U shape.
A through hole 66e into which the protrusion 644 of the armature 25 is fitted is formed in the bent portion of the armature 6b, and protrusions 66c and 66d bent in a K-shape are provided on both sides of the protrusion 66b. A through hole 66f that fits into the pin-shaped protrusion 623 of the base 62 is formed in the base 66a.

When the spring 66 is incorporated in the electromagnetic relay 61, the protrusion 66b presses the armature 25, and the protrusions 66c and 66d abut on the yoke 24.

Therefore, when no current is supplied to the coil 22, the T-shaped part of the armature 25 is pushed down,
As shown in (a), the insulating layer 643 is separated from the metal protrusion 633 so that the movable contact 13 provided on the movable portion 632a of the movable contact spring 632 is brought into contact with the fixed contact 654. Since the tip of the T-shaped portion of the amateur 25 is pushed up, the metal protrusion 633 is pushed up via the insulating layer 643 as shown in FIG.
The movable contact 13 fixed contact 6 pushed up by the pushing up
It comes into contact with 55.

In FIG. 2, the fixed contact unit 65
A pair of fixed contact terminals 652 and 653 near the upper ends are respectively inserted into an insulator 651 made of BT resin,
The break-side fixed contact 654 of the fixed contact terminal 652 and the make-side fixed contact 65 of the fixed contact terminal 653 (see FIG. 3) 65
5 are opposed in the vertical direction as shown in FIG. 3 in the rectangular side hole 651a of the insulator 651, and the fixed contact terminals 652 and 653
Lead portions 652a and 653a are led out to the side surface of the insulator 651 and hang down.

A pair of tongue pieces 651b projecting from the lower rear surface of the insulator 651 are formed with through holes 651c that fit into the pin-shaped projections 622 of the base 62. When the electromagnetic relay 61 is completed, the movable contact 13 As shown in FIG.
The movable contact spring 632 is inserted between the opposed sides of 54 and 655.
The insulating layer 643 of the amateur 25 faces below the protrusion 633 of FIG. When the movable contact 13 contacts the fixed contact 654, the protrusion 633 and the insulating layer 643 are separated from each other. When the coil 22 is energized and the armature 25 is operated, the insulating layer 643 pushes up the protrusion 633. The movable contact 13 separated from the fixed contact 654 by pushing up
Comes into contact with the fixed contact 655.

[0043]

According to the electromagnetic relay of the present invention described above, the structure of the medium for transmitting the operation of the armature to the movable contact spring is changed, and further, the shape of the coil terminal is changed.
Withstands high-temperature soldering and high-temperature atmospheres such as in-vehicle equipment, eliminating the characteristic changes and malfunctions that occurred in conventional electromagnetic relays.

[Brief description of the drawings]

FIG. 1 is a perspective view of an electromagnetic relay according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of the electromagnetic relay of FIG. 1;

FIG. 3 is an explanatory diagram of a movable contact spring and an amateur insulating layer in the electromagnetic relay of FIG. 1;

FIG. 4 is an explanatory diagram of a coil terminal in the electromagnetic relay of FIG. 1;

FIG. 5 is a perspective view in which a conventional electromagnetic relay is exploded into main parts.

[Explanation of symbols]

 Reference Signs List 13 movable contact 22 coil 25 amateur 61 electromagnetic relay 62 base 63 movable contact block 64 electromagnetic block 65 fixed contact unit 632 movable contact spring 641 bobbin 642 coil terminal 643 insulating layer 644 metal protrusion 652, 653 fixed contact terminal 654, 655 fixed contact

Continued on the front page (72) Inventor Kenichi Ihara 2-3-5 Higashi Gotanda, Shinagawa-ku, Tokyo Inside Fujitsu Takamizawa Component Co., Ltd. (72) Inventor Koichi Kondo 2-3-5 Higashi-Gotanda, Shinagawa-ku, Tokyo Fujitsu Takamisawa Component Co., Ltd.

Claims (4)

[Claims] 1. An electromagnet, a magnetic circuit, and a contact spring set, wherein a movable contact spring of the contact spring set swings by swinging of an armature of the magnetic circuit, and the contact spring is swung by swinging of the movable contact spring. In an electromagnetic relay in which a fixed contact and a movable contact of a set are closed or separated, an intermediate portion of the movable contact spring projects toward the armature and serves as a medium for transmitting the swing of the armature to the movable contact spring. An electromagnetic relay, wherein a metal projection is provided, and an insulating layer is provided at a predetermined portion of the armature where the metal projection contacts. 2. The electromagnetic relay according to claim 1, wherein said insulating layer is a ceramic coating layer. 3. The electromagnetic relay according to claim 1, wherein said insulating layer is a baked layer of a fluorine resin. 4. A coil terminal implanted on a bobbin of the electromagnet for connection to a coil of the electromagnet, a middle portion of which is bent, and at least a part of the bent portion is inserted into the bobbin. The electromagnetic relay according to claim 1, wherein: