JP5377108B2 - Electromagnetic relay - Google Patents

Description

  The present invention relates to an electromagnetic relay that uses a permanent magnet, forms a magnetic circuit with an armature and a yoke, and opens and closes contacts efficiently.

  Conventionally, an electromagnetic relay that performs a latching operation or a single stable operation by using a permanent magnet in a magnetic circuit is known. FIG. 3 is a diagram showing a schematic configuration of such an electromagnetic relay, in which (a) is a plan view and (b) is a front view. FIG. 4 is a perspective view showing a schematic configuration of a coil block in the electromagnetic relay.

  In FIG. 3, the electromagnetic relay 3 includes a coil block 31 in which a coil is wound around a body portion of a coil bobbin, an armature 32 that is slidably inserted into the coil block 31 and protrudes at both ends, and an armature 32, a pair of yokes 33a, 33b disposed opposite to both sides of the both ends, a permanent magnet (not shown) sandwiched between the yokes 33a, 33b, a card 35 locked to the armature 32, A pair of movable springs 36a and 36b, to which the movable contacts 37a and 37b are respectively fixed, and the card 35 is bridged, a pair of fixed contacts 38a and 38b that contact and separate from the movable contacts 37a and 37b, respectively, and a pair of coil terminals Plates 39a and 39b are provided, and these are erected on a body 30 made of an insulating resin (see, for example, Patent Documents 1 to 5).

  In the electromagnetic relay 3, when a current flows through the coil block 31 via the coil terminal plates 39 a and 39 b, the armature 32 is attracted to the yoke 33 a by the generated magnetic flux and the magnetic flux of the permanent magnet, and the card 35 moves the movable spring 36 a. , 36b are displaced, and the movable contacts 37a, 37b and the fixed contacts 38a, 38b, which have been separated, come into contact with each other. On the other hand, when the current to the coil block 31 is cut off, the armature 32 is restored by the spring load force of the movable springs 36a and 36b, and the movable contacts 37a and 37b and the fixed contacts 38a and 38b are separated from each other.

  FIG. 4 is a diagram showing a schematic configuration of the coil block 31. In the figure, a coil block 31 has a configuration in which a coil 40 is wound around a body portion of a bobbin block 41.

  The bobbin block 41 is formed in a rectangular tube shape with flanges at both ends by a resin mold, and a pair of convex coil binding portions 43a and 43b are provided on the end surface in the extending direction. Coil connection terminals 44a and 44b and bobbin terminals 45a and 45b connected to each other are provided on both side surfaces in the vicinity so as to protrude.

  In the bobbin block 41 configured as described above, the winding start end and the winding end end of the coil 40 are respectively wound around the coil binding portions 43a and 43b, and are then soldered after being wound around the coil connection terminals 44a and 44b. Thus, the coil block 31 shown in FIG. 4 is completed.

  Bobbin terminal plates 45a and 45b of the coil block 31 are soldered to coil terminal plates 39a and 39b press-fitted and fixed to the body 30, respectively.

However, in the coil block 31 of the electromagnetic relay 3 described above, since the coil binding portions 43a and 43b are in the vicinity of the coil connection terminals 44a and 44b, respectively, due to thermal and mechanical stress during soldering. There is a problem that the coil 40 is easily broken.
In addition, when soldering the bobbin terminals 45a and 45b and the coil terminal plates 39a and 39b, the scattered flux adheres to the surfaces of the movable contacts 37a and 37b and the fixed contacts 38a and 38b, causing poor conduction, and armature 32 and the yokes 33a and 33b may adhere to the magnetic pole surfaces and cause a magnetic malfunction.

  Thus, for example, in Patent Documents 1 to 3, the lead terminal joining portion joined to the lead terminal by soldering or the like is separated from the coil binding portion so that the lead wire is not subjected to thermal stress.

No. 05-011630 Japanese Patent Laid-Open No. 04-267026 Japanese Patent Laid-Open No. 04-174930 Japanese Utility Model Publication No. 63-102146 Japanese Utility Model Publication No. 63-040702

However, in Patent Documents 1 and 3, although the lead terminal joining portion and the coil binding portion are separated from each other, they are separately provided on the flange portion, which means that the separation distance of the lead wire is increased due to the separation itself. New issues have been raised.
Further, in Patent Document 2, although the lead terminal joint portion and the coil binding portion are separated, they are continuously provided on the same line, and the lead wire drawing distance is shortened, but at the time of solder joining. There was a problem that flux scattering was inevitable.
The present invention has been made in view of the above circumstances, and is an electromagnetic relay that can prevent coil disconnection due to thermal and mechanical stress, contact continuity failure due to flux scattering, and magnetic malfunction of magnetic poles. The purpose is to provide.

The electromagnetic relay of the present invention includes an electromagnet block composed of a coil and an iron core wound around a coil bobbin, a pair of coil terminals electrically connected to the coil, and a contact point that contacts and separates according to the excitation state of the coil. The coil bobbin includes a first extending portion extending in a horizontal direction with respect to the side surfaces of both end portions, and protruding from the side surface and orthogonal to the first extending portion. A bobbin terminal formed in an L shape with a second extending portion extending in a direction perpendicular to the side surface is provided at a position where the bobbin terminal comes into contact with the coil terminal, and the winding start and end of the coil are provided to the pair of bobbin terminals. Are wound around the first extension part and the second extension part, respectively, and are joined by laser welding in a state where the coil terminal and the second extension part of the bobbin terminal are in contact with each other. It is characterized in.
That is, the coil bobbin has flange portions at both ends, and is provided with a bobbin terminal formed in an L shape with a horizontal portion and a vertical portion protruding from the flange portion at a position where the coil bobbin contacts the coil terminal. The winding start and the winding end are respectively wound around the horizontal part (first extension part) and the vertical part (second extension part) of the pair of bobbin terminals, and the coil terminal and the second extension of the bobbin terminal It joins by laser welding in the state which contacted the part.

  With this configuration, since the portion where the coil is entangled and the portion where the coil is connected are separated from each other, it is difficult to be affected by thermal and mechanical stress, and disconnection of the coil can be prevented. Further, since laser welding is used for joining the coil and bobbin terminal and the bobbin terminal and coil terminal and soldering is not performed, it is possible to prevent contact conduction failure and magnetic malfunction of the magnetic pole due to scattering of flux.

  ADVANTAGE OF THE INVENTION According to this invention, the electromagnetic relay which can prevent the disconnection of the coil by thermal and mechanical stress, the conduction failure of the contact by the scattering of a flux, and the magnetic malfunction of a magnetic pole can be provided.

(A) Top view which shows schematic structure of electromagnetic relay in embodiment of this invention (b) Front view which shows schematic structure of electromagnetic relay in embodiment of this invention (A) Top view which shows schematic structure of coil block of electromagnetic relay in embodiment of this invention (b) Front view which shows schematic structure of coil block of electromagnetic relay in embodiment of this invention (c) of this invention The side view which shows schematic structure of the coil block of the electromagnetic relay in embodiment (A) Top view showing schematic configuration of conventional electromagnetic relay (b) Front view showing schematic configuration of conventional electromagnetic relay The perspective view which shows schematic structure of the coil block of the conventional electromagnetic relay

  Hereinafter, an electromagnetic relay according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1A is a plan view showing a schematic configuration of an electromagnetic relay according to an embodiment of the present invention, and FIG. 2B is a front view thereof. FIG. 2 shows a coil block of the electromagnetic relay according to the embodiment of the present invention. It is a schematic plan view, (a) a plan view, (b) a front view, (c) a side view.

  In FIG. 1, the electromagnetic relay 1 according to the embodiment of the present invention includes a coil block 11, an armature 12, a first yoke 13 a, a second yoke 13 b, an electromagnet block composed of a permanent magnet (not shown), a card 15, A contact mechanism portion including movable springs 16a and 16b, movable contacts 17a and 17b, fixed contacts 18a and 18b, and coil terminal plates 19a and 19b is provided, and these are erected on the body 10 made of an insulating resin. In addition, the electromagnetic relay 1 of this Embodiment is formed as a box body covered with a cover (not shown) in the completed manufacturing state.

  As shown in FIG. 2, the coil block 11 includes a bobbin block 21 in which a coil 20 is wound a predetermined number of times around a body portion.

  The bobbin block 21 is formed in a rectangular tube shape with flanges at both ends by a resin mold, and a pair of bobbin terminal plates 22a, 22b protrudes.

  The bobbin terminal plates 22a and 22b have a horizontal portion as a first extending portion whose projecting portions form coil binding portions 23a and 23b, and a vertical portion as a second extending portion forming coil connecting portions 24a and 24b. It is formed in an L shape.

  In the bobbin block 21 configured as described above, the winding start end and the winding end end of the coil 20 are respectively wound around the coil binding portions 23a and 23b and the coil connection portions 24a and 24b several times.

  The coil connection portions 24a and 24b of the bobbin terminal plates 22a and 22b are respectively brought into contact with the coil terminal plates 19a and 19b that are press-fitted and fixed to the body 10 and stand upright, and the welding position LW shown in FIGS. The coil 20 and the coil terminal plates 19a and 19b are electrically and mechanically joined by welding with each other.

  In the coil block 11 of this embodiment configured as described above, the coil binding portions 23a and 23b of the bobbin terminal plates 22a and 22b and the coil connection portions 24a and 24b joined to the coil terminal plates 19a and 19b are separated from each other. Therefore, the coil 20 is not easily affected by thermal and mechanical stress, and disconnection can be prevented.

  Further, since soldering is not used for joining the bobbin terminal plates 22a, 22b and the coil terminal plates 19a, 19b, the conduction failure between the movable contacts 17a, 17b and the fixed contacts 18a, 18b due to the scattering of the flux, It becomes possible to avoid a magnetic malfunction between the first and second yokes 13a and 13b.

  The armature 12 is formed in a long plate shape from a magnetic material such as electromagnetic soft iron, and is slidably inserted into the coil block 11 with both ends protruding, and both sides of the both ends are first and second. The yokes 13a and 13b are arranged so as to be opposed to both ends. When the coil block 11 is excited, a magnetic path is formed together with the first and second yokes 13a and 13b and the permanent magnet, and is attracted and separated from the first yoke 13a or the second yoke 13b.

  The first and second yokes 13a and 13b are formed in a U-shaped plate shape from a magnetic material such as electromagnetic soft iron, and are arranged opposite to both end portions of the armature 12 with both end portions serving as magnetic pole portions. Then, a magnetic path of magnetic flux generated by exciting the coil block 11 is formed, and by matching with the spring load force of the movable springs 16a and 16b, the armature 12 is attracted at both ends, and the movable contact 17a. 17b and the fixed contacts 18a and 18b are brought into contact with and separated from each other.

  A permanent magnet (not shown) is formed in a flat plate shape, is magnetized in the thickness direction, and is sandwiched between the first and second yokes 13a and 13b. The magnetic flux of the permanent magnet is the second closed coil 13b, the first closed magnetic path from the front end portion of the armature 12 to the rear end portion, the first yoke 13a to the permanent magnet, and the second yoke 13b, the rear of the armature 12. A second closed magnetic path is formed from the end portion to the tip portion, the first yoke 13a, and the permanent magnet again. These first and second closed magnetic paths generate an attractive holding force between the tip of the armature 12 and the second yoke 13b when the coil block 11 is not excited.

  The card 15 is formed in an inverted U shape by an insulating resin, its central portion is locked to the armature 12, and both ends are bridged by the movable springs 16a and 16b. With this configuration, the operation of the armature 12 can be transmitted to the movable springs 16a and 16b.

  The movable springs 16a and 16b are formed in a long shape by a non-magnetic thin plate spring material such as white and white, and the movable contacts 17a and 17b are caulked and fixed to one end, respectively, and substantially parallel to both sides in the longitudinal direction of the coil block 11. In this way, the other end is fixed to the movable terminal. The movable springs 16a and 16b are driven by the card 15 at the approximate center in the longitudinal direction, so that the movable contacts 17a and 17b are brought into contact with and separated from the fixed contacts 18a and 18b.

  The movable contacts 17a and 17b are formed in a disk shape having a convex curved surface using a contact material having a low contact resistance, such as a silver alloy, and are fixed by caulking to one ends of the movable springs 16a and 16b, respectively.

  The fixed contacts 18a and 18b are formed in a disk shape having a flat surface using a contact material such as a silver alloy similar to the movable contacts 17a and 17b, and are fixed to the movable terminals.

  The coil terminal plates 19a and 19b are made of a copper alloy plate such as phosphor bronze, and are fitted to the body 10 so that their tip portions are in contact with the bobbin terminal plates 22a and 22b of the bobbin block 21, respectively. The coil terminal plates 19a and 19b may be formed by press-fitting and fixing to the body 10.

  Next, the schematic operation of the electromagnetic relay 1 according to the embodiment of the present invention configured as described above will be described.

  In the state of FIG. 1, when the coil block 11 is excited to a predetermined polarity, the tip of the armature 12 is attracted to the end face of the tip of the first yoke 13a by the generated magnetic flux and the magnetic flux of the permanent magnet. Then, the movable springs 16a and 16b bridged by the card 15 locked to the armature 12 are displaced, and the separated movable contacts 17a and 17b come into contact with the fixed contacts 18a and 18b, respectively.

  When the excitation of the coil block 11 is cut off, the tip of the armature 12 and the movable springs 16a and 16b return to the original state by the spring load force against the attractive force of the second yoke 13b by the magnetic flux of the permanent magnet. The movable contacts 17a and 17b and the fixed contacts 18a and 18b are respectively separated from each other.

  As described above, according to the electromagnetic relay 1 in the embodiment of the present invention, the coil binding portions 23 a and 23 b are provided on both side surfaces of the end portion in the extending direction of the bobbin block 21 constituting the coil block 11. The bobbin terminal plates 22a and 22b formed in an L-shape projecting from the horizontal portion formed and the vertical portion forming the coil connecting portions 24a and 24b are provided so as to start winding of the coil 20 wound around the body portion of the bobbin block 21. After the end and the winding end are wound around the coil binding portions 23a and 23b and the coil connection portions 24a and 24b several times, they are brought into contact with the coil terminal plates 19a and 19b and joined by laser welding.

  As a result, the coil binding portions 23a and 23b of the bobbin terminal plates 22a and 22b and the coil connection portions 24a and 24b joined to the coil terminal plates 19a and 19b are separated from each other. It becomes difficult to be affected, and disconnection of the coil 20 can be prevented. Further, since soldering is not used for joining the bobbin terminal plates 22a, 22b and the coil terminal plates 19a, 19b, the conduction failure between the movable contacts 17a, 17b and the fixed contacts 18a, 18b due to the scattering of the flux, It becomes possible to avoid a magnetic malfunction between the first and second yokes 13a and 13b.

DESCRIPTION OF SYMBOLS 1 Electromagnetic relay 11 Coil block 19a, 19b Coil terminal board 20 Coil 21 Bobbin block 22a, 22b Bobbin terminal board 23a, 23b Coil binding part 24a, 24b Coil connection part

Claims (1)

An electromagnet block comprising a coil wound around a coil bobbin and an iron core; a pair of coil terminals electrically connected to the coil; and a contact mechanism having a contact point that contacts and separates according to the excitation state of the coil. An electromagnetic relay,
The coil bobbin
A first extending portion that extends in the horizontal direction with respect to the side surfaces of both ends, and a second extending portion that protrudes from the side surface and that extends perpendicular to the first extending portion and extends in a direction perpendicular to the side surface. A bobbin terminal formed in a shape is provided at a position where it abuts on the coil terminal,
Winding the winding start and winding end of the coil around the first extension part and the second extension part of the pair of bobbin terminals, respectively,
An electromagnetic relay, wherein the coil terminal and the second extended portion of the bobbin terminal are in contact with each other by laser welding.

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