JP2018081828A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic relay capable of reliably maintaining attachment state of a coil bobbin to a case.SOLUTION: An electromagnetic relay 10 includes: a coil 320; a coil bobbin 330 on which the coil 320 is wound; and a coil terminal 340 which is connected to the coil 320 and is attached to the coil bobbin 330. The electromagnetic relay 10 also includes: a case 20 which has an attachment part 227 to which the coil terminal 340 is attached; and a yoke 350 which is attached to the coil bobbin 330 to form a magnetic circuit. The yoke 350 has a stationary portion 354 formed to be fixed to the case 20.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an electromagnetic relay.

  Conventionally, an electromagnetic relay including a coil bobbin around which a coil is wound, a coil terminal attached to the coil bobbin, and a yoke attached to the coil bobbin to form a magnetic circuit is known (for example, Patent Document) 1).

JP2015-133191A

  In Patent Document 1, the coil bobbin is attached to the case by attaching the coil terminal to the case. At this time, it is preferable that the state where the coil bobbin is attached to the case can be more reliably maintained.

  Then, an object of this invention is to obtain the electromagnetic relay which can maintain the state in which the coil bobbin is attached to the case more reliably.

  The electromagnetic relay of the present invention includes a coil, a coil bobbin around which the coil is wound, and a coil terminal to which the coil is connected and attached to the coil bobbin.

  The electromagnetic relay includes a case having an attachment portion to which the coil terminal is attached, and a yoke that is attached to the coil bobbin to form a magnetic circuit.

  And the fixing part fixed to the said case is formed in the said yoke.

  ADVANTAGE OF THE INVENTION According to this invention, the electromagnetic relay which can be made to maintain the state where the coil bobbin is attached to the case more reliably can be obtained.

It is a figure which shows the electromagnetic relay concerning one Embodiment of this invention, Comprising: (a) is a front view, (b) is a side view, (c) is a top view, (d) is a rear view, (e) is a back surface FIG. It is a disassembled perspective view of the electromagnetic relay concerning one Embodiment of this invention. It is sectional drawing which shows the state which removed the cover of the electromagnetic relay concerning one Embodiment of this invention. It is a rear view which shows the state which removed the cover of the electromagnetic relay concerning one Embodiment of this invention. It is a rear view which shows the state which removed the cover of the electromagnetic relay concerning the modification of one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, the direction in which the movable contact and the fixed contact face each other is defined as the front-rear direction (X direction), and the direction in which the fixed contacts are arranged in parallel is defined as the width direction (Y direction). The side on which the movable contact is disposed is defined as the front side in the front-rear direction, and the side on which the fixed contact is disposed is defined as the rear side in the front-rear direction. Further, in the state where the electromagnetic relay is arranged so that the tip of the external connection terminal faces downward, the upper side (cover side) is the upper side (Z direction) and the lower side (external connection terminal side) is the vertical direction (Z direction). It is defined as the lower side.

  As shown in FIGS. 1 and 2, the electromagnetic relay 10 according to the present embodiment has a substantially rectangular parallelepiped outer surface, and includes a case 20, an electromagnet block 30, a movable body 40, and a contact block. 50. However, the outer surface of the electromagnetic relay 10 may have any shape. In the present specification, “substantially rectangular parallelepiped” means that even if there are some irregularities, the virtual hexahedron drawn along the surface occupying most of the outer surface forms a rectangular parallelepiped shape as a whole. Means things.

  The case 20 includes a cover 210 as a lid member and a base 220 to which the electromagnet block 30 and the contact block 50 are attached. The cover 210 is formed in a substantially box shape having an opening 210a on the lower side. The cover 210 covers a substantially plate-shaped base 220, whereby the case 20 having an internal space is formed.

  Specifically, the base 220 includes a bottom wall portion 221 and a peripheral wall portion 222 that is connected to the outer peripheral end of the bottom wall portion 221 and rises upward. The case 20 having a substantially rectangular parallelepiped internal space is formed by fitting the peripheral wall portion 222 of the base 220 to the opening peripheral wall 210b of the cover 210.

  In the internal space formed in the case 20, members excluding the portions of the electromagnet block 30, the movable body 40, and the contact block 50 that protrude below the base 220 (outside the case 20) are accommodated. . Examples of the portion protruding to the lower side of the base 220 (outside the case 20) include an external connection terminal portion (a terminal main body 341 of a coil terminal 340 and an external connection terminal 523 of a fixed contact portion 520, which will be described later).

  The cover 210 and the base 220 can be formed of, for example, a synthetic resin that is an insulating material, and may be transparent or opaque.

  In the present embodiment, the bottom wall portion 221 of the base 220 is formed in a substantially rectangular plate shape. Coil terminal insertion holes 221a through which the coil terminals 340 are inserted are respectively formed on both sides in the Y direction at the rear portion in the X direction of the bottom wall portion 221. The coil terminal insertion hole 221a has an elongated slit shape in the Y direction, as shown in FIGS.

  On the other hand, fixed terminal insertion holes 221b through which the external connection terminal pieces 523 of the fixed contact portions 520 are inserted are respectively formed on both sides in the Y direction at the front portion in the X direction of the bottom wall portion 221. The fixed terminal insertion hole 221b has an elongated slit shape in the X direction, as shown in FIGS.

  In addition, an extension piece (first extension portion: fixing portion) of a yoke 350 to be described later is provided at a substantially central portion in the Y direction (between two coil terminal insertion holes 221a) at the rear portion in the X direction of the bottom wall portion 221. A yoke insertion hole 221c into which 354 is inserted is formed.

  In addition, a magnet housing portion 223 that opens downward and houses the permanent magnet 60 is formed at the center portion in the X direction of the bottom wall portion 221 (between the coil terminal insertion hole 221a and the fixed terminal insertion hole 221b). ing. In the present embodiment, the magnet housing portion 223 is connected to the bottom wall portion 221, and includes a side wall portion 223 a that forms four sides of a quadrangle in plan view (as viewed from above in the Z direction), and an upper end of the side wall portion 223 a And a ceiling wall portion 223b which is provided continuously around the entire periphery and covers the upper side.

  The permanent magnet 60 has a function as a magnetic field generating means for generating a magnetic field that stretches an arc that is generated when movable contacts 512a and 512b, which will be described later, and fixed contacts 524a and 524b contact and separate.

  In the present embodiment, a flat yoke 70 is disposed below the permanent magnet 60. Four positioning projections 71 formed by doweling are formed on the yoke 70, and the permanent magnet 60 is positioned by the four positioning projections 71. The yoke 70 has a pair of insertion holes 72. When the yoke 70 is arranged below the base 220, each insertion hole 72 communicates with a fixed terminal insertion hole 221 b formed in the base 220. Like to do.

  In the present embodiment, a pair of sandwiching pieces 224 and 224 projecting upward from the top wall portion 221b are formed at both ends in the Y direction at the front portion in the X direction of the magnet housing portion 223. When attached to the wall 221, the coil bobbin 330 (front flange 331) of the electromagnet block 30 is held between the pair of holding pieces 224 and 224.

  Furthermore, in the present embodiment, two sets of contacts that contact and separate from each other are provided, and one set of contacts (the movable contact 512a and the fixed contact 524a) and the other set of contacts (the other set of contacts ( A partition wall 225 that partitions the movable contact 512b and the fixed contact 524b) is formed. The partition wall 225 is formed so as to protrude forward in the X direction from the center in the Y direction of the side wall portion 223a located on the front side in the X direction.

  In this embodiment, the electromagnet block 30 includes a coil block 310, a yoke 350, an iron core 360, and a stopper spring 370. The coil block 310 includes a coil 320, a coil bobbin 330 around which the coil 320 is wound, and a coil terminal 340 to which the coil 320 is connected and attached to the coil bobbin 330.

  In the present embodiment, the coil bobbin 330 is formed with a through hole 330 a into which the iron core 360 is inserted. The coil bobbin 330 includes a front flange 331, a rear flange 332, and a cylindrical portion 333 that connects the front flange 331 and the rear flange 332 to each other. The coil bobbin 330 can be formed using, for example, a resin or the like. In the present embodiment, a resin molded product is illustrated as the coil bobbin.

  The front flange 331 has a substantially rectangular plate shape, and a stopper spring holding portion 331 a that holds the stopper spring 370 is formed at the front portion of the front flange 331. The stopper spring 370 suppresses the movable spring 511 in which the movable contacts 512a and 512b are formed from being separated from the fixed piece 522 in which the fixed contacts 524a and 524b are formed by a predetermined distance or more. The stopper spring 370 can be formed using metal, for example, and includes a main body 371 having a substantially rectangular plate shape. And this main-body part 371 is accommodated in the recessed part formed in the front part of the front side collar part 331. FIG. Thus, in this embodiment, the recessed part formed in the front part of the front side collar part 331 becomes the stopper spring holding | maintenance part 331a which hold | maintains the stopper spring 370. As shown in FIG.

  A through hole 371a into which the iron core 360 is inserted is formed at the center of the main body 371, and a spring piece 371b is formed at the peripheral edge of the through hole 371a in the main body 371. This spring piece 371b is formed so as to be elastically deformable. When the iron core 360 is inserted into the through hole 371a of the stopper spring 370, the spring piece 371b is pressed by the head 362 of the iron core 360 to bend (elastically deform). It has become.

  Further, the stopper spring 370 includes a hook portion 372 connected to the Y-direction central portion of the lower portion of the main body portion 371, and a free end portion of this hook portion 372 (a piece portion that is arranged forward in the X direction and rises upward) ) Is prevented from moving in a direction away from the fixed piece 522 of the movable spring 511.

  Further, wall portions 331b projecting forward in the X direction are formed at both ends in the Y direction of the front flange portion 331. An opening opening downward is formed in the wall portion 331b, and the fixed contact portion 520 is attached to the coil bobbin 330 by press-fitting the fixed contact portion 520 (the attachment piece 521 in this embodiment) into the opening. It has been.

  Further, a protruding wall portion 331c protruding forward in the X direction is formed between the pair of wall portions 331b at the lower end in the Z direction of the front side flange portion 331 (Y direction central portion at the lower end of the front side flange portion 331). A hook portion 372 of a stopper spring 370 is placed on the upper surface of the protruding wall portion 331c.

  Further, projecting portions 331d projecting upward are respectively formed at both ends in the Y direction at the upper end of the front flange portion 331, and the yoke 350 is sandwiched between the pair of projecting portions 331d.

  On the other hand, the rear collar part 332 includes a collar body 332a and an extending part 332b that extends downward from the lower part of the collar body 332a. Is formed with a recess 332c in which the yoke 350 is positioned.

  In addition, protrusions 332f that protrude upward are formed at both ends of the upper end of the collar body 332a in the Y direction, respectively. With the yoke 350 attached to the coil bobbin 330, the yoke 350 is a pair of protrusions. It is made to intervene between the portions 332f.

  In addition, at both ends in the Y direction of the extending portion 332b, coil terminal attachment portions 332d into which the attachment piece portions 342 of the pair of coil terminals 340 are press-fitted are formed. The coil terminal attachment portion 332d is an opening that opens downward, and the coil terminal 340 is attached to the coil bobbin 330 by press-fitting the attachment piece 342 of the coil terminal 340 into the opening.

  The cylindrical portion 333 has a cylindrical shape with both ends in the axial direction (X direction) opened. A front flange 331 is connected to the axial front end of the cylindrical portion 333, and a rear flange at the axial rear end. A portion 332 is provided continuously. A coil 320 is wound around the outer peripheral surface of the cylindrical portion 333, and a shaft portion 361 of the iron core 360 is inserted into the through hole 330 a inside the cylindrical portion 333.

  Each of the coil terminals 340 and 340 can be formed into a long plate shape using a conductive material such as copper, for example, and is inserted into the coil terminal insertion hole 221a and protrudes to the outside of the case 20. And an attachment piece portion 342 that is connected to the upper end of the terminal main body 341 and press-fitted into the coil terminal attachment portion 332d. Each attachment piece 342 is formed with a coil binding portion 342a. One end of the coil 320 is connected to one coil binding portion 342a, and the other end is connected to the other coil binding portion 342a. It is entwined. By doing so, the pair of coil terminals 340 and the coil 320 are electrically connected.

  The yoke 350 is attached to the coil bobbin 330 to form a magnetic circuit. In the present embodiment, the yoke 350 is bent into a substantially L shape. That is, the yoke 350 is disposed above the coil bobbin 330, is connected to the first wall portion 351 extending substantially horizontally, and the rear end of the first wall portion 351, and is disposed behind the coil bobbin 330. And a second wall portion 352 extending downward. The first wall portion 351 and the second wall portion 352 can be integrally formed of, for example, a magnetic material.

  In the present embodiment, a protrusion 351a to which a later-described return spring 420 is attached is formed on the upper portion of the first wall portion 351 so as to protrude upward. The second wall portion 352 includes a main body portion 353, and an attachment hole 353a into which the iron core 360 is inserted and supported is formed in the main body portion 353.

  The iron core 360 includes a substantially cylindrical shaft portion 361 and a bowl-shaped head portion 362 continuously provided on one end side of the shaft portion 361, and the yoke 350 and the coil block are interposed via the iron core 360. 310 is supported. The shaft portion 361 and the head portion 362 can be integrally formed of, for example, a magnetic material.

  The electromagnet block 30 having such a configuration can be assembled by the following method, for example.

  First, the coil 320 is wound around the outer peripheral surface of the cylindrical portion 333 of the coil bobbin 330.

  Next, the attachment piece portions 342 of the coil terminal 340 are press-fitted into the pair of coil terminal attachment portions 332 d formed on the coil bobbin 330, and the pair of coil terminals 340 are attached to the coil bobbin 330. At this time, the attachment piece 521 of the fixed contact portion 520 may be press-fitted into the opening of the wall portion 331 b so that the fixed contact portion 520 is also attached to the coil bobbin 330.

  Next, one end side of the coil 320 is entangled with the coil entangled portion 342a of one coil terminal 340, and the other end side is entangled with the coil entangled portion 342a of the other coil terminal 340. The coil terminal 340 and the coil 320 are electrically connected.

  Next, the stopper spring 370 is held by the coil bobbin 330 by inserting the main body portion 371 of the stopper spring 370 into the stopper spring holding portion 331a. At this time, the through hole 371a of the main body portion 371 communicates with the through hole 330a of the coil bobbin 330, and the hook portion 372 of the stopper spring 370 is placed on the upper surface of the protruding wall portion 331c.

  Next, the first wall portion 351 of the yoke 350 is held between the pair of protrusions 331d formed on the front flange portion 331 of the coil bobbin 330, and the recess portion 332c formed on the rear flange portion 332 of the coil bobbin 330 is inserted. The yoke 360 is attached to the coil bobbin 330 by inserting the front side of the second wall portion 352.

  Next, the shaft portion 361 of the iron core 360 with the head 362 positioned forward is inserted into the through hole 371a of the stopper spring 370 and the through hole 330a of the coil bobbin 330 from the front. At this time, the shaft portion 361 of the iron core 360 is inserted until the tip 361a protrudes rearward from the through hole 330a. Thus, when the shaft portion 361 is inserted into the through-hole 330a until the tip 361a protrudes rearward from the through-hole 330a, the spring piece 371b of the stopper spring 370 is pressed by the head 362 of the iron core 360 and bent backward. It will be. Then, with the spring piece 371 b bent backward by the head 362, the tip 361 a of the shaft portion 361 is inserted into the attachment hole 353 a of the yoke 350 and fixed. As a method for fixing the iron core 360 to the yoke 350, a conventionally known method such as press fitting or caulking can be used.

  Thus, the iron core 360 is fixed to the yoke 350. At this time, the main body 371 including the spring piece 371 is sandwiched between the head 362 of the iron core 360 and the front flange 331 of the coil bobbin 330 with the spring piece 371b bent backward. By doing so, the main body 371 including the spring piece 371 is sandwiched between the head 362 and the front flange 331 in a state where an elastic restoring force is generated, so that the stopper spring 370 is securely held by the coil bobbin 330. Can be made.

  Thus, the electromagnet block 30 is assembled. In addition, the assembly method of the electromagnet block 30 is not restricted to said method, The assembly | attachment order etc. of each member can be changed suitably.

  A movable body 40 is attached to the electromagnet block 30 so as to be movable relative to the electromagnet block 30.

  In the present embodiment, the movable body 40 includes an armature 410, a return spring 420, and an insulating holder 430.

  The armature 410 includes a main body portion 411 and an extending portion 412 that extends downward from the main body portion 411. The main body portion 411 and the extending portion 412 can be integrally formed of a magnetic material, for example. A projection 411 a that protrudes forward is formed on the front surface of the main body 411, and the armature 410 is attached to the return spring 420 by inserting the projection 411 a into an insertion hole 422 a formed in the return spring 420. ing. Further, as shown in FIG. 3, the extending portion 412 is thinner than the main body portion 411, and the insulating holder 430 is disposed on the front surface of the extending portion 412. Further, a projecting piece 412a projecting downward is formed at the center of the lower portion of the extending portion 412 in the Y direction. The movable spring 511 is restrained from moving in a direction away from the fixed piece 522.

  The return spring 420 can be formed using, for example, metal, and has a shape obtained by bending a single plate-like member. In this embodiment, the return spring 420 includes a fixed piece 421 fixed to the yoke 350, a fixed piece 422 fixed to the armature 410 and an insulating holder 430 connected to the tip (lower end). , And a spring portion 423 that connects the fixed piece 421 and the fixed piece 422.

  Then, the protrusions 351a provided on both sides in the Y direction of the first wall portion 351 of the yoke 350 are inserted into the insertion holes 421a formed on both sides in the Y direction of the fixing piece 421, and the protrusions 411a of the armature 410 are fixed. The armature 410 is swingably supported with respect to the yoke 350 by being inserted into the insertion holes 422a formed on both sides in the Y direction of the piece 422. In the present embodiment, the armature 410 is disposed at a position facing the head 362 of the iron core 360.

  When the coil 320 is not energized (when the electromagnet block 30 is not energized), the armature 410 is pulled away from the head 362 of the iron core 360 by the urging force (upward urging force) of the return spring 420. It is made to be held in the state where it was. On the other hand, when the coil 320 is energized (when the electromagnet block 30 is excited), the magnetic force of the head portion 362 of the iron core 360 exceeds the urging force of the return spring 420, and the armature 410 becomes the head portion 362 of the iron core 360. To touch.

  A movable contact portion 510 that swings according to the operation (swing) of the armature 410 is attached to the armature 410 via the insulating holder 430 and the return spring 420.

  The movable contact portion 510 can be formed of a conductive material such as copper, and constitutes a part of the contact block 50. Note that the contact block 50 further includes a fixed contact portion 520.

  In the present embodiment, the movable contact portion 510 is provided with a pair of movable contacts 512 a and 512 b, and the pair of movable contacts 512 a and 512 b provided on the fixed contact portion 520 in response to the swing of the movable contact portion 510. The contact switching is performed by contacting and separating the fixed contacts 524a and 524b.

  The movable contact portion 510 is attached to the armature 410 via an insulating holder 430, and includes a movable spring (movable side support portion) 511 provided with movable contacts 512a and 512b. In the present embodiment, the movable contact portion 510 has two movable springs 511.

  One movable contact (movable contact 512a or movable contact 512b) is formed at the tip of each of the two movable springs 511. Specifically, the movable contacts 512a and 512b are respectively inserted into and fixed to insertion holes 511a formed at the distal end portions of the movable springs 511, so that the movable contacts 512a and 512b are fixed to the movable springs 511, respectively. Yes.

  The fixed contact portion 520 includes two fixed contacts 524 a and 524 b fixed to each other, and is press-fitted into the coil bobbin 330 and attached to the base 220. The fixed contact portion 520 can also be formed of a conductive material such as copper, for example.

  Specifically, as shown in FIGS. 3 and 4, each fixed contact portion 520 has an attachment piece 521 press-fitted into the opening of the wall portion 331 b and a fixed contact (fixed contact 524 a or fixed contact 524 b) inserted and fixed. A fixed piece (fixed side support portion) 522 formed with an insertion hole 522a, and an external connection terminal piece 523 that is inserted into the fixed terminal insertion hole 221b of the base 220 and protrudes outward.

  When the coil 320 is not energized (when the electromagnet block 30 is de-energized), a set of contacts (movable contact 512a and fixed contact 524a, movable contact 512b and fixed contact 524b) that are separated from each other is separated. It is arranged. On the other hand, when the movable contact portion 510 swings when the coil 320 is energized (when the electromagnet block 30 is excited), the movable contacts (the movable contact 512a and the movable contact 512b) are fixed contacts (fixed). The contact 524a and the fixed contact 524b) are brought into close contact with each other.

  Next, the contact operation of the electromagnetic relay 10 having such a configuration will be described.

  In the electromagnetic relay 10, when the electromagnet block 30 is in a non-excited state, the return spring 420 urges the insulating holder 430 upward, so that the armature 410 rotates in the clockwise direction in FIG. . Therefore, the armature 410 is separated from the head 362 of the iron core 360, and one set of contacts (movable contact 512a and fixed contact 524a) and the other set of contacts (movable contact 512b and fixed contact). 524b) are also separated.

  Then, when the coil 320 is energized to excite the electromagnet block 30, a magnetic force that attracts the armature 410 to the head 362 of the iron core 360 is generated through the yoke 350, the iron core 360, and the armature 410. At this time, the armature 410 is attracted to the head portion 362 of the iron core 360 against the spring force (biasing force) of the return spring 420, and the armature 410 rotates counterclockwise in FIG. Accordingly, the movable contact portion 510 also moves in the counterclockwise direction, and the two movable contacts 512a and 512b come into contact with the opposed fixed contacts 524a and 524b, respectively.

  When energization of the coil 320 is stopped, the reverse operation is performed, and one set of contacts (movable contact 512a and fixed contact 524a) and the other set of contacts (movable contact 512b and fixed contact 524b) are respectively provided. Break apart.

  Thus, by switching on / off of energization to the coil 320, each movable contact (the movable contact 512a and the movable contact 512b) is brought into contact with and separated from the fixed contact (the fixed contact 524a and the fixed contact 524b) facing each other. It becomes.

  Incidentally, as described above, the coil terminal 340 and the fixed contact portion 520 are merely press-fitted into the coil bobbin 330 and are not fixed to the coil bobbin 330. That is, the coil terminal 340 is simply press-fitted into the press-fitting part (coil terminal mounting part 332d) of the coil bobbin 330, and the fixed contact part 520 is simply press-fitted into the press-fitted part (opening of the wall part 331b) of the coil bobbin 330. It has only been done. As described above, in the present embodiment, the coil terminal 340 and the fixed contact portion 520 are configured to be movable relative to the coil bobbin 330.

  On the other hand, the coil terminal 340 and the fixed contact portion 520 are generally fixed to the base 220 using an adhesive 226 or the like. In this embodiment, as shown in FIG. 1, the coil terminal 340 is fixed to the base 220 with the adhesive 226 in a state of being inserted into the coil terminal insertion hole 221a, and the fixed contact portion 520 is fixed to the fixed terminal insertion hole 221b. It is fixed to the base 220 with an adhesive 226 while being inserted into the base 220. As described above, in this embodiment, the base 220 includes the fixing portion (attachment portion) 227 to which the coil terminal 340 is fixed and the fixing portion (attachment portion) 228 to which the fixed contact portion 520 is fixed.

  In the case of such a configuration, for example, if excessive shock or vibration is applied to the electromagnetic relay 10 due to dropping or external vibration, the press fitting of the coil terminal 340 or the fixed contact portion 520 to the coil bobbin 330 may be loosened. As described above, if the press fitting of the coil terminal 340 and the fixed contact portion 520 to the coil bobbin 330 is loosened, the coil bobbin 330 may be lifted with respect to the base 220, or the coil bobbin 330 may be detached from the base 220. . That is, the state where the coil bobbin 330 is attached to the base 220 (case 20) may not be maintained.

  Therefore, in this embodiment, the state where the coil bobbin 330 is attached to the case 20 can be more reliably maintained.

  Specifically, an extension piece (first extension portion: fixing portion) 354 was formed on the yoke 350 attached to the coil bobbin 330. Then, by fixing the extended piece 354 to the base 220 (case 20), the coil bobbin 330 can be suppressed from being lifted with respect to the base 220.

  In the present embodiment, the extending piece 354 is formed so as to extend downward from the lower portion of the center in the Y direction of the main body portion 353 of the second wall portion 352. Then, the extension piece 354 is fixed to the base 220 using an adhesive or the like with the tip of the extension piece 354 inserted into the yoke insertion hole 221c formed in the base 220, so that the yoke 350 is fixed to the base 220. It is fixed to 220 (case 20). Such an extended piece 354 can be formed by rolling the yoke 350, for example.

  Further, in the present embodiment, as described above, a resin molded product is illustrated as the coil bobbin 330. That is, the coil bobbin 330 is formed by using a mold and pouring resin into the mold from a resin gate. Therefore, the resin bobbin 332e which is a resin gate trace is formed in the coil bobbin 330.

  The resin gate portion 332e can be formed at any part of the coil bobbin 330, but is preferably formed at a position where the coil bobbin 330 can be molded with higher accuracy.

  In the present embodiment, the resin gate portion 332e is formed at a relatively thick portion of the central portion in the Y direction of the rear flange portion 332. That is, the resin gate portion 332e is a rear portion of the coil bobbin 330 that is substantially plane-symmetric with respect to the XZ plane (the XZ plane including the central axis of the cylindrical portion 333) and a large portion of the molding volume. The portion 332 is formed in a relatively thick portion (below the concave portion 332c where the yoke 350 is positioned). By doing so, the molding flow (resin flow during resin molding) can be further stabilized, and the coil bobbin 330 can be molded more accurately.

  Further, in the present embodiment, the resin gate portion 332e is formed on the rear side of the rear flange portion 332, that is, on a portion away from the contacts (movable contacts 512a, 512b and fixed contacts 524a, 524b) that are in contact with and separated from each other. Yes. By doing so, it is possible to suppress the molding waste (for example, glass fiber and burrs blended for improving the strength) generated when the coil bobbin 330 is molded from affecting the contact operation.

  However, depending on how the electromagnetic relay 10 is used, molding waste that has fallen off from the molded product (coil bobbin 330) adheres to the contacts (movable contacts 512a, 512b and fixed contacts 524a, 524b), causing poor conduction. There is a risk of affecting the contact operation.

  Therefore, in the present embodiment, it is possible to more reliably suppress the molding waste of the molded product (coil bobbin 330) from affecting the contact operation.

  Specifically, a cover portion 355 that covers the resin gate portion 332e formed on the coil bobbin 330 is formed on the yoke 350, and when the yoke 350 is attached to the coil bobbin 330, the resin gate portion 332e is covered by the cover portion 355. I was covered.

  In the present embodiment, the resin gate portion 332e is covered with the extended piece 354 fixed to the base 220. As described above, in this embodiment, the extending piece 354 as a fixing portion fixed to the base 220 also serves as the cover portion 355.

  Furthermore, in this embodiment, the coil bobbin 330 is formed with a hollow resin gate portion 332e, and the hollow resin gate portion 332e is closed without any gap by the extended piece 354 (cover portion 355). ing. The resin gate portion 332e may be formed in a protruding shape, or may be formed to be flush with the surrounding surface. In this case, it is preferable to cover the resin gate portion 332e in a state where the cover portion 355 faces the resin gate portion 332e and is in contact with the resin gate portion 332e. If it carries out like this, it can suppress that molding waste falls from a molded article (coil bobbin 330).

  In the present embodiment, the extension piece 354 (cover portion 355) is thinner than the main body portion 353. Thus, by making the thickness of the extended piece 354 (covering portion 355) thinner than the thickness of the main body portion 353, the resin gate portion 332e formed in a portion where the rear flange portion 332 is relatively thick. It is possible to suppress an increase in the size in the front-rear direction when covering.

  As described above, in the present embodiment, the electromagnetic relay 10 includes the coil 320, the coil bobbin 330 around which the coil 320 is wound, and the coil terminal 340 to which the coil 320 is connected and attached to the coil bobbin 330. ing.

  The electromagnetic relay 10 includes a base 220 (case 20) having an attachment portion (fixed portion 227) to which the coil terminal 340 is attached, and a yoke 350 that is attached to the coil bobbin 330 and forms a magnetic circuit. .

  The yoke 350 is formed with an extended piece (fixed portion) 354 that is fixed to the base 220 (case 20).

  In this way, since the coil bobbin 330 is fixed to the base 220 (case 20) via the yoke 350, even if excessive shock or vibration is applied to the electromagnetic relay 10 due to dropping or external vibration, It becomes possible to suppress the coil bobbin 330 from being lifted with respect to the base 220 (case 20). That is, according to the present embodiment, the state where the coil bobbin 330 is attached to the base 220 (case 20) can be more reliably maintained.

  In the present embodiment, the yoke 350 includes the first wall portion 351 disposed on the upper portion of the coil bobbin 330 in a state where the case 20 is disposed such that the attachment portion (adhering portion 227) is located below. Yes.

  In this way, the coil bobbin 330 can be interposed between the base 220 (case 20) and the first wall portion 351, so that the coil bobbin 330 can be more reliably lifted with respect to the base 220 (case 20). Can be suppressed.

  Further, in the present embodiment, the yoke 350 includes a second wall portion 352 that is connected to the first wall portion 351 and extends downward, and a piece extending to the second wall portion 352. (Fixed portion) 354 is formed.

  By so doing, the first wall portion 351 is fixed to the base 220 (case 20) via the extending piece (fixing portion) 354 formed on the second wall portion 352, and thus the base 220 (case 20). And the first wall portion 351 can sandwich the coil bobbin 330. Therefore, the coil bobbin 330 can be more reliably suppressed from floating with respect to the base 220 (case 20).

  In the present embodiment, the coil bobbin 330 is formed with a coil terminal mounting portion (press-fit portion) 332 d into which the coil terminal 340 is press-fitted.

  Thus, even if the coil terminal 340 is simply press-fitted into the press-fitting part (coil terminal mounting part 332d) of the coil bobbin 330, in this embodiment, the extension piece (fixing part) 354 is attached to the base 220 (case 20). ), The coil bobbin 330 is lifted with respect to the base 220 (case 20) even when excessive shock or vibration is applied to the electromagnetic relay 10 due to dropping or external vibration. It becomes possible to suppress.

  That is, when attaching the coil terminal 340 to the coil bobbin 330, the coil bobbin 330 can be prevented from being lifted with respect to the base 220 (case 20) without fixing the coil terminal 340 to the coil bobbin 330.

  Moreover, in this embodiment, the attaching part to which the coil terminal 340 in the base 220 (case 20) is attached becomes the adhering part 227.

  As described above, when the coil terminal 340 is fixed to the base 220 (case 20), when an excessive impact or vibration is applied to the electromagnetic relay 10 due to dropping or external vibration, the coil bobbin 330 is attached to the base 220 ( It tends to float up against the case 20). However, in this embodiment, since the coil bobbin 330 is fixed to the base 220 (case 20) via the yoke 350, the coil bobbin 330 is prevented from being lifted with respect to the base 220 (case 20). become able to.

  In particular, in this embodiment, the extended piece (fixed portion) 354 formed on the yoke 350 is fixed to the base 220 (case 20) to which the coil terminal 340 and the fixed contact portion 520 are fixed. Therefore, compared with the case where the coil terminal 340 is fixed (fixed) to the coil bobbin 330 with an adhesive or the like, a configuration that can suppress the coil bobbin 330 from being lifted with respect to the base 220 can be obtained more easily. For example, when the coil terminal 340 and the fixed contact portion 520 are fixed to the base 220 (case 20) using an adhesive or the like, the extending piece (fixed portion) is attached together with the fixing of the coil terminal 340 or the fixed contact portion 520. The 354 can be fixed (fixed) to the base 220 (case 20).

  Thus, according to this embodiment, the structure which can maintain the state where the coil bobbin 330 is attached to the case 20 more reliably can be obtained more easily.

  In this embodiment, the coil bobbin 330 is formed by resin molding, and the yoke 350 is formed with a cover portion 355 that covers the resin gate portion 332e formed on the coil bobbin 330.

  If it carries out like this, it can suppress that molding waste falls from a molded article (coil bobbin 330), and suppresses more reliably that the molding waste of a molded article (coil bobbin 330) will affect contact operation. Will be able to.

  In this embodiment, the extended piece (fixed portion) 354 formed on the yoke 350 also serves as the cover portion 355.

  By doing so, it is not necessary to provide the cover portion 355 separately from the extended piece (fixed portion) 354 formed on the yoke 350, so that the configuration can be simplified. As a result, the manufacturing is facilitated and the cost can be reduced.

  In the above embodiment, the extension piece (fixed portion) 354 formed on the yoke 350 is also used as the cover portion 355. However, the extension piece (fixed portion) 354 and the yoke 350 are Alternatively, a cover portion 355 may be formed (see FIG. 5).

  In the configuration shown in FIG. 5, a pair of extending pieces 354 are formed on the main body portion 353 of the second wall portion 352 so as to extend downward from the lower portions at both ends in the Y direction. Then, the pair of extending pieces 354 are fixed to the base 220 using an adhesive or the like with the tips of the pair of extending pieces 354 inserted into the pair of yoke insertion holes 221c and 221c formed on the base 220, respectively. Thus, the yoke 350 is fixed to the base 220 (case 20).

  On the other hand, a second extending piece (covering portion) 355 projecting so as to extend downward is formed from the lower portion of the main body portion 353 of the second wall portion 352 in the Y direction center. A second extending piece (covering portion) 355 covers the resin gate portion 332e. As shown in FIG. 5, the second extending piece 355 is not fixed to the base 220 (case 20).

  Such extended pieces 354 and second extended pieces 355 can be formed, for example, by rolling the yoke 350.

  Even with this configuration, it is possible to achieve substantially the same operations and effects as in the above embodiment.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made.

  For example, in the above-described embodiment and its modification, an extension piece obtained by extending a part of the main body portion 353 downward is used as a fixing portion or a cover portion (an extension in which the width in the Y direction is narrower than that of the main body portion 353). Although the installation piece is a fixing part or a covering part), the fixing part or the covering part can be formed by extending a part of the main body part 353 downward.

  In the above-described embodiment and its modification, the fixing part (extending piece 354) is fixed to the base 220, but the fixing part (extending piece 354) is fixed to the cover 210. It is also possible to do.

  It is also possible not to provide the cover portion 355 on the yoke 350.

  In addition, the electromagnet block, the movable contact portion and the fixed contact portion, and other detailed specifications (shape, size, layout, etc.) can be changed as appropriate.

10 Electromagnetic relay 20 Case 227 Fixed part (mounting part)
320 Coil 330 Coil bobbin 332d Coil terminal mounting part (press-fit part)
332e Resin gate part 340 Coil terminal 350 Relay 351 First wall part 352 Second wall part 354 Extension piece (fixing part)
355 Cover

Claims (7)

Coils,
A coil bobbin around which the coil is wound;
A coil terminal to which the coil is connected and attached to the coil bobbin;
A case having an attachment portion to which the coil terminal is attached;
A yoke attached to the coil bobbin to form a magnetic circuit;
With
The electromagnetic relay according to claim 1, wherein a fixed portion fixed to the case is formed on the yoke.   2. The electromagnetic relay according to claim 1, wherein the yoke includes a first wall portion that is attached to an upper portion of the coil bobbin in a state in which the case is disposed so that the attachment portion is located below. The yoke includes a second wall portion that is provided continuously to the first wall portion and extends downward;
The electromagnetic relay according to claim 2, wherein the fixed portion is formed on the second wall portion.   The electromagnetic relay according to any one of claims 1 to 3, wherein the coil bobbin is formed with a press-fitting portion into which the coil terminal is press-fitted.   The electromagnetic relay according to claim 1, wherein the attachment portion is a fixed portion. The coil bobbin is formed by resin molding,
The electromagnetic relay according to any one of claims 1 to 5, wherein a cover portion that covers a resin gate portion formed on the coil bobbin is formed on the yoke.   The electromagnetic relay according to claim 6, wherein the fixing portion also serves as the covering portion.

Images