JP3985400B2 - Coil bobbin structure of electromagnetic relay and iron core fixing method of electromagnetic relay - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes a yoke having a fixed portion formed in an L shape and having a through hole, and a protrusion formed in a column shape larger than the through hole and slightly smaller than the through hole. The structure of a coil bobbin used for an electromagnet of an electromagnetic relay composed of an iron core that is inserted into a through-hole and is crimped to the yoke by crimping its tip side and a coil wound around the iron core Is.
[0002]
[Prior art]
Conventionally, various thin electromagnetic relays having high insulating properties and a small mounting area are commercially available and proposed. In this type of electromagnetic relay, a rectangular through-hole is drilled in the yoke, a part of the iron core is inserted into the through-hole, and the tip thereof is caulked by so-called spin caulking etc. There is a case where a method of fixing is used.
[0003]
[Problems to be solved by the invention]
However, in the fixing method of the iron core and the yoke by such caulking, if the iron core is unevenly drawn from the yoke surface, the portion near the through hole in the yoke swells and deforms during caulking. However, there may be a gap (remain) between the iron core and the yoke. In this case, the magnetic coupling is weakened and the attractive force by the electromagnet is weakened.
[0004]
In order to solve this problem, the present applicant has proposed an electromagnetic fixing structure for an electromagnetic relay and a method therefor in Japanese Patent Application No. 11-180922. The electromagnet of this electromagnetic relay includes a yoke having a fixed portion (bent surface portion) formed in an L shape and having a rectangular through hole formed on one end side, a direction longer than the through hole and a direction perpendicular thereto. At least one of the two is formed in a columnar shape having a long cross section, and has a protruding portion having a slightly smaller protruding surface than the through hole on one end side, a flange portion on the other end side, and inserting the protruding portion into the through hole. The iron core is fixed to the yoke by crimping the tip end thereof, and a coil block having a pair of coil terminals wound around a bobbin and electrically connected to the coil. According to this configuration, the inclination of the iron core during caulking with respect to the iron core and the yoke can be prevented, and as a result, the decrease in the attractive force of the electromagnet can be prevented, and the attractive force of the electromagnet can be increased stably.
[0005]
However, in the case of the electromagnet fixing method of the electromagnetic relay, the yoke and the iron core are fixed from the through hole while being fixed with a fixing jig from a total of five directions of the outer peripheral direction of the fixing portion and one direction of the flange portion. Although spin caulking is performed so as to fill the gap formed between the through hole and the protrusion with respect to the iron core, the axial fixing of the iron core and prevention of its inclination are sufficient, The iron core is not sufficiently fixed with respect to the spin, and the iron core may rotate with respect to the fixed portion of the yoke to cause a malfunction.
[0006]
The present invention has been made in view of the above circumstances, and an object of the present invention is to propose a coil bobbin structure of an electromagnetic relay that can reliably fix the iron core against the spin when the iron core and the yoke are fixed by spin caulking. And
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention described in claim 1 is characterized in that a yoke having an L-shaped fixing part with a rectangular through hole formed at one end thereof and a longitudinal direction longer than the through hole are provided. And formed in a column shape having a long cross section in at least one of the directions orthogonal thereto, and having a projecting portion of a projecting surface slightly smaller than the through hole on one end side and a flange portion on the other end side, A coil bobbin used for an electromagnet of an electromagnetic relay constituted by an iron core inserted into the through hole and caulked at its tip side and fixed to the yoke, and a coil wound around the iron core The coil bobbin has a ridge partially formed with a notch for inserting a fixing jig, and is interposed between the iron core and the coil.
[0008]
In this structure, since the iron core is exposed in the notch region of the ridge, the iron core can be fixed in the region by the fixing jig. Thereby, when fixing an iron core and a yoke by spin caulking, an iron core can be reliably fixed to spin.
[0009]
The coil bobbin structure of the electromagnetic relay according to claim 1, wherein the coil bobbin is formed in a shape having a U-shaped cross section and having ridges at both ends, and the ridge located on the flange portion side of the iron core has the notches. It may be a structure (claim 2). According to this structure, when the iron core and the yoke are fixed by spin caulking, the iron core can be reliably fixed to the spin.
[0010]
The coil bobbin structure of the electromagnetic relay according to claim 1, wherein the coil bobbin is formed in a cylindrical shape having ridges at both ends, and the ridge located on the flange portion side of the iron core has the notch. (Claim 3) According to this structure, when the iron core and the yoke are fixed by spin caulking, the iron core can be reliably fixed to the spin.
[0011]
Furthermore, in the coil bobbin structure of the electromagnetic relay according to any one of claims 1 to 3, the protrusion that restricts the movement of the card is formed on the flange located on the flange portion side of the iron core. Good (Claim 4). According to this structure, when the iron core and the yoke are fixed by spin caulking due to the notch for inserting the fixing jig, the iron core can be securely fixed to the spin. The inclination of the protrusion of the collar resulting from the inclination of the iron core relative to the part can be prevented. Thereby, the clearance of the protrusion of the collar with respect to the card can be ensured, and stable operation becomes possible.
[0012]
According to a fifth aspect of the present invention, there is provided an electromagnet for an electromagnetic relay comprising the coil bobbin having the coil bobbin structure of the electromagnetic relay according to any one of the first to fourth aspects, the yoke, the iron core, and the coil. The iron core and the iron core in a state in which the protrusion is inserted into the through-hole are arranged in a total of 5 directions in the outer periphery 4 direction of the fixing portion and in one direction on the flange portion side. From the direction, when performing spin caulking so as to fill a gap generated between the through hole and the protrusion, with respect to the iron core from the through hole while fixing with a fixing jig, Furthermore, the iron core is fixed through the notch with the fixing jig.
[0013]
According to this method, when the iron core and the yoke are fixed by spin caulking, the iron core can be reliably fixed to the spin.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a coil bobbin structure of an electromagnetic relay according to an embodiment of the present invention, and is a perspective view of the coil bobbin seen from two opposite directions. FIG. 2 is a front view of an electromagnetic relay formed by applying the coil bobbin structure of the electromagnetic relay. FIG. 3 is an exploded perspective view of the electromagnet block shown in FIG. 2, and the embodiment will be described below with reference to these drawings.
[0015]
First, the structure of the electromagnetic relay will be described. The electromagnetic relay shown in FIG. 2 includes a container body 1 made of a resin body 11 and a cover 12, a fixed contact block 2, another fixed contact block 3, and these fixed contacts. A movable contact spring block 4 interposed between the blocks 2 and 3, an electromagnet block 5 (electromagnet), an armature 6, and a card 7 are provided.
[0016]
The fixed contact block 2 includes a metal fixed side terminal 21 and a metal fixed contact 22 provided on the upper left surface of the fixed side terminal 21. Similarly, the fixed contact block 3 is also composed of a metal fixed side terminal 31 and a metal fixed contact 32 provided on the upper right surface of the fixed side terminal 31, and these fixed contact blocks 2 and 3 The fixed contacts 22 and 32 are incorporated in the body 11 so as to face each other and are accommodated in the container 1.
[0017]
The movable contact spring block 4 includes a metal movable side terminal 41, a metal leaf spring 42 whose lower end is connected to the upper end of the movable side terminal 41 (for example, fastened with a rivet), and the upper left and right sides of the leaf spring 42. A pair of metal movable contacts 43 provided on the surface, and the pair of movable contacts 43 are incorporated in the body 11 so as to face the above-described fixed contacts 22 and 32 so as to be detachable from each other. It is stored inside.
[0018]
As shown in FIG. 3, the electromagnet block 5 is integrated by a yoke 51, an iron core 52, a coil bobbin 53 (see FIG. 1), a coil 54 wound around the coil bobbin 53, and a hinge spring 55 for attaching the armature 6. Configured in the body 11 and housed in the container 1.
[0019]
The yoke 51 is formed in an L shape and has a fixing portion 511 with a rectangular through hole 511a formed on the right end side, and two protrusions for fastening the hinge spring 55 on the lower surface on the left end side. 511b (see FIG. 2A). The hinge spring 55 has a hole (not shown) through which each protrusion 511b is inserted. The protrusion 511b is inserted into each hole, and the distal end side of the protrusion 511b is caulked to be fastened to the yoke 51. The
[0020]
The iron core 52 is formed in a columnar shape having a cross section longer in the longitudinal direction than the through-hole 511a, and has a protruding portion 521 of a protruding surface 521a slightly smaller than the through-hole 511a on the right end side and a flange portion 522 on the left end side. The protrusion 521 is inserted into the through hole 511a and the tip end side thereof is caulked to be fixed to the yoke 51. The specific structure of the coil bobbin 53 will be described later.
[0021]
As shown in FIG. 2, the armature 6 is supported at the lower end side thereof by the yoke 51 via a hinge spring 55 so as to be substantially rotatable, and is attached to and detached from the flange portion 522 of the iron core 52. The card 7 is engaged with both the movable contact spring block 4 and the armature 6, and one movable contact 43 of the movable contact spring block 4 is fixed to the fixed contact blocks 2 and 3 according to the rotation of the armature 6. The contact is made to contact either one of the contacts 22 and 32. In the example of FIG. 2, a pair of engagement grooves 61 are formed on both sides of the upper end of the armature 6, and hook-like protrusions 71 that engage with the engagement grooves 61 are integrally formed on both sides of the right end of the card 7. On the other hand, a shaft-like protrusion 72 is integrally formed at the right end of the card 7 which is a pressing portion with respect to the upper end portion of the movable contact spring block 4, and the protrusion is formed at the upper end portion of the movable contact spring block 4. A hole through which 72 is inserted is formed. Further, a projecting piece 73 having a hole 73 a is integrally formed at the center of the left end of the card 7.
[0022]
FIG. 4 is a view showing a reference example of a coil bobbin suitable for the comparative explanation of the coil bobbin of FIG. 1. Next, the structure of the coil bobbin 53 will be described by further using FIG.
[0023]
As shown in FIG. 1, the coil bobbin 53 includes a central part 531 having a U-shaped cross section that extends in the left-right direction and opens rearward, a thin collar part 532 formed at the right end of the central part 531, and a central part 531. A thick collar portion 533 formed at the left end of the collar portion, the front portion being cut away, a square-shaped projection portion 534 projecting from the upper surface of the collar portion 533, and extending downward from the rear of the lower end of the collar portion 533. The coil 54 is integrally formed with a pair of coil terminals 535 to which both ends are connected, and the lower surface side is integrally formed with an extending portion 536 that also serves as the outer wall of the container body 1 (FIG. 2A). )reference).
[0024]
That is, the coil bobbin 53 has a structure having a flange portion 533 formed by cutting out the hatched portion A in FIG. 4. Thus, when the iron core 52 is mounted on the coil bobbin, in the reference example in FIG. The right side from the flange portion 522 of 52 is covered with the coil bobbin, but in the coil bobbin 53 of the present embodiment, a part of the right side (shaded portion B in FIG. 3) is exposed from the flange portion 522 of the iron core 52. It becomes a state.
[0025]
Further, the left end of the front surface of the central portion 531 extends slightly to the left from the right end of the flange portion 533 as shown in FIGS. 1 and 2A.
[0026]
Further, the protrusion 534 of the collar 533 is provided to restrict the movement of the card 7 in the left-right direction, and is inserted into the hole 73a in the protrusion 73 of the card 7 in the example of FIG. The outer dimension of the protrusion 534 and the hole diameter of the protrusion 73 are a predetermined clearance C between the protrusion 534 and the inner wall of the hole 73a of the protrusion 73 in the front-rear direction (vertical direction in FIG. 2B). Designed to have
[0027]
FIG. 5 is an explanatory view of a fixing method during spin caulking with respect to the yoke 51 and the iron core 52, FIG. 6 is a perspective view of the electromagnet block 5 before and after spin caulking, and FIG. In the explanatory view of the obtained effect, an example of the assembly procedure of the electromagnet block 5 will be described below using these drawings.
[0028]
First, the iron core 52 is attached to the coil bobbin 53, the coil 54 is wound around the coil bobbin 53, and then both ends of the coil 54 are connected to a pair of coil terminals 535 of the coil bobbin 53 (for example, solder connection). Alternatively, the coil 54 may be wound around the coil bobbin 53, both ends of the coil 54 may be connected to the pair of coil terminals 535 of the coil bobbin 53, and then the iron core 52 may be attached to the coil bobbin 53.
[0029]
Thereafter, the protrusion 521 of the iron core 52 is inserted into the through hole 511 a of the yoke 51. Thereby, the temporarily fixed electromagnet block 5 as shown to Fig.6 (a) is obtained. At this time, since the protruding length of the protruding portion 521 is longer than the through length of the through hole 511a, a part of the protruding portion 521 protrudes rightward from the through hole 511a, and that portion is to be taken out.
[0030]
Thereafter, as shown in FIG. 5, the yoke 51 and the iron core 52 are divided by the divided portions J1 to J3 from a total of five directions including the outer periphery 4 directions D1 to D4 of the fixing portion 511 and the one direction D5 on the flange portion 522 side. The projection 521 protrudes from the through hole 511a while being fixed downward by the fixing jig J and pressing downward around the through hole 511a in the fixing portion 511 with a cylindrical elastic member EM made of urethane rubber or the like. On the other hand, spin caulking is executed so as to fill a gap formed between the through hole 511a and the protrusion 521.
[0031]
Here, in the example of FIG. 5, the fixing jig J fixes the direction of D1 at the dividing portion J1, fixes the direction of D2 at the dividing portion J2, and fixes the directions of D3 to D5 at the dividing portion J3. It is configured as follows. Further, the split part J3 is provided with a presser part J31 for pressing a part of the iron core 52 exposed by the notch of the flange part 533 (see the hatched part B in FIG. 3). Both a part and the rear side wall of the flange portion 522 of the iron core 52 (see the hatched portion E in FIG. 3) are fixed. If both the part and the rear side wall of the flange portion 522 are not fixed in this way, the iron core 52 is shown in FIG. 7, for example, with respect to the fixing portion 511 of the yoke 51 during spin caulking. There is a risk of turning in the direction of the arrow. If the yoke 51 and the iron core 52 are caulked and fixed in a rotated state, the coil bobbin 53 is also inclined according to the inclination of the iron core 52 relative to the fixing portion 511 of the yoke 51. Then, since the protrusion 534 at the flange 533 of the coil bobbin 53 is also inclined in the same direction as the inclination of the iron core 52, the clearance C shown in FIG. 2B is eliminated, and the protrusion 534 of the coil bobbin 53 and the card 7 Friction with the protrusion 73 increases. As a result, a malfunction occurs in the operation. For this reason, in this embodiment, since both the part and the rear side wall of the flange portion 522 are fixed, the iron core 52 rotates with respect to the fixing portion 511 of the yoke 51 during spin caulking. Therefore, an electromagnetic relay with stable operation can be obtained.
[0032]
As described above, as shown in FIG. 6B, the iron core 52 is almost completely removed, and the gap between the through hole 511a and the protrusion 521 is eliminated, and the electromagnet block 5 fixed by caulking is obtained. When performing the above-described spin caulking, the iron core 52 is pressed against the right surface of the fixing portion 511 of the yoke 51 so as to press the left surface of the fixing portion 511 against the stepped surface of the iron core 52 generated by the protrusion 521. Spin caulking may be performed to such an extent that it does not buckle.
[0033]
As described above, according to the present embodiment, when the iron core 52 and the yoke 51 are fixed by spin caulking, the iron core 52 can be reliably fixed to the spin. As a result, the clearance C can be ensured as designed, and stable operation is possible. Further, since the magnetic pole surface of the iron core 52 is not fixed in a rotated state, the magnetic flux is transmitted to the armature 6 without loss as designed. Further, as in the invention of Japanese Patent Application No. 11-180922, the attraction force of the electromagnet can be increased, and the tilt of the iron core during spin caulking can be prevented.
[0034]
In the present embodiment, the coil bobbin has a structure having a central portion 531 having a U-shaped cross section, but is not limited to this structure, and may have a structure having a cylindrical central portion. An example of this structure is shown in FIG. 8, and a reference example of a coil bobbin suitable for the comparative explanation is shown in FIG. A coil bobbin 53A shown in FIG. 8 is formed in the same manner as the coil bobbin 53 shown in FIG. 1 except that the central portion 531A is formed in a cylindrical shape. However, in FIG. 8, the coil terminal 535 is not shown, and the hatched area F indicates a notch area. Also in this case, when the iron core 52 is attached to the coil bobbin, in the reference example of FIG. 9, the portion G is not cut out, so the right side from the flange portion 522 of the iron core 52 is covered with the coil bobbin. On the other hand, in the coil bobbin 53A shown in FIG. 8, since a part of the iron core 52 corresponding to the hatched area F (shaded area B in FIG. 3) is exposed, the same effects as in the above embodiment are achieved. It becomes possible. Further, in the structure of FIG. 8A, as in FIG. 2A, the left end of the front surface of the central portion 531A extends slightly to the left of the right end of the flange portion 533, so that it is wound around the coil bobbin 53A. Even if the formed coil 54 swells to the left, the extending portion of the central portion 531A is interposed between the swelled coil portion and the iron core 52. It is possible to ensure a sufficient insulation distance.
[0035]
Moreover, the connection structure of a yoke and an iron core is not restricted to the structure shown in FIG. 3, You may employ | adopt another connection structure. Other examples of the coupling structure are shown in FIGS. In the example of FIG. 10, the yoke 51 </ b> A has a fixed portion 511 </ b> A in which a rectangular through hole 511 a </ b> A having a short length in the front-rear direction and a long length in the vertical direction is formed on the right end side as compared with FIG. 3. Except having it, it forms similarly to the yoke 51 shown in FIG. The iron core 52A is formed in a columnar shape having a slightly shorter length in the longitudinal direction than the through hole 511aA and having a wide cross section, and has a protrusion 521A having a slightly smaller protruding surface on the right end side than the through hole 511aA and a flange portion. 522 on the left end side. On the other hand, in the example of FIG. 11, the yoke 51 </ b> B has a fixing portion 511 </ b> B provided with a rectangular through-hole 511 a </ i> B having a shorter length in the front-rear direction and the vertical direction on the right end side as compared with FIG. 3. It is formed similarly to the yoke 51 shown in FIG. The iron core 52B is formed in a column shape having a cross section that is slightly larger than the through hole 511aB, and has a protruding portion 521B having a slightly smaller protruding surface than the through hole 511aB on the right end side and a flange portion 522 on the left end side. Yes. Even with these coupling structures, it is possible to increase the attractive force of the electromagnet and prevent the iron core from tilting during spin caulking.
[0036]
Furthermore, in this embodiment, the notch region is structured to be provided in front of the flange portion 533. However, the structure may be provided in the rear, and in this case, the pressing portion corresponding to the pressing portion J31 is divided into divided portions. Needless to say, it is necessary to provide J1.
[0037]
【The invention's effect】
As is apparent from the above, according to the first aspect of the present invention, a yoke having a fixed portion formed on an L side and having a rectangular through hole formed at one end thereof, and the through hole The protrusion is formed in a columnar shape having a long cross section in at least one of the longitudinal direction and the direction orthogonal thereto, and has a protruding portion with a slightly smaller protruding surface than the through hole on one end side and a flange portion on the other end side. The projection is inserted into the through-hole and the tip side thereof is caulked to be used for an electromagnet of an electromagnetic relay constituted by an iron core fixed to the yoke and a coil wound around the iron core. The coil bobbin is formed with a ridge partially formed with a notch for inserting a fixing jig, and is interposed between the iron core and the coil. When fixing the core and yoke with spin caulking, The iron core can be reliably fixed to.
[0038]
According to a second aspect of the present invention, in the coil bobbin structure of the electromagnetic relay according to the first aspect, the coil bobbin is formed in a shape having a U-shaped cross section and having flanges at both ends, and is positioned on the flange portion side of the iron core. In this structure, when the iron core and the yoke are fixed by spin caulking, the iron core can be reliably fixed to the spin.
[0039]
According to a third aspect of the present invention, in the coil bobbin structure of the electromagnetic relay according to the first aspect, the coil bobbin is formed in a cylindrical shape having ridges at both ends and is located on the flange portion side of the iron core. Even in this structure, when the iron core and the yoke are fixed by spin caulking, the iron core can be securely fixed to the spin.
[0040]
According to a fourth aspect of the present invention, in the coil bobbin structure of the electromagnetic relay according to any one of the first to third aspects, the protrusion positioned on the flange portion side of the iron core has a protrusion that restricts the movement of the card. In this structure, when fixing the iron core and the yoke by spin caulking, the iron core is securely fixed to the spin by the notch for inserting the fixing jig. Therefore, it is possible to prevent the inclination of the protrusion of the ridge caused by the inclination of the iron core with respect to the fixed portion of the yoke. Thereby, the clearance of the protrusion of the collar with respect to the card can be ensured, and stable operation becomes possible.
[0041]
According to invention of Claim 5, the electromagnetic relay comprised by the coil bobbin with the coil bobbin structure of the electromagnetic relay in any one of Claims 1-4, the said yoke, the said iron core, and the said coil The iron core in the electromagnet is fixed to the yoke and the iron core in a state in which the protrusion is inserted into the through hole in the four directions of the outer periphery of the fixing portion and one direction of the flange portion. From a total of five directions, spin caulking is performed so as to fill the gap formed between the through hole and the protrusion with respect to the iron core from the through hole while being fixed with a fixing jig. At this time, since the iron core is fixed through the notch with the fixing jig, the iron core can be reliably fixed to the spin when the iron core and the yoke are fixed by spin caulking.
[Brief description of the drawings]
1A and 1B show a coil bobbin structure of an electromagnetic relay according to an embodiment of the present invention, and are perspective views of the coil bobbin as viewed from two opposite directions.
FIGS. 2A to 2C are cross-sectional views of the electromagnetic relay formed by applying the coil bobbin structure of the present electromagnetic relay, as viewed from the front, top, and left.
3 is an exploded perspective view of the electromagnet block shown in FIG. 2. FIG.
4A and 4B are perspective views of a coil bobbin suitable for comparison with the coil bobbin of FIG. 1 as viewed from two opposite directions.
FIG. 5 is an explanatory view of a fixing method during spin caulking with respect to a yoke and an iron core.
6A and 6B are perspective views of an electromagnet block before and after spin caulking, respectively.
FIG. 7 is an explanatory diagram of an effect obtained by a collar part with a part cut away;
FIGS. 8A and 8B show another coil bobbin having a cylindrical central portion, where FIG. 8A is a front view and FIG. 8B is a left side view.
FIG. 9 shows a reference example of a coil bobbin suitable for comparison with the coil bobbin in FIG. 8, wherein (a) is a front view and (b) is a left side view.
FIG. 10 is a perspective view showing another example of a joint structure of a yoke and an iron core.
FIG. 11 is a perspective view showing another example of a joint structure of a yoke and an iron core.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Container 2 Fixed contact block 3 Fixed contact block 4 Movable contact spring block 5 Electromagnet block 6 Armature 7 Card 51 yoke 52 Iron core 53 Coil bobbin 54 Coil 531 Center part 532 collar part 533 collar part 534 Projection part 535 Coil terminal 536 Extension part

Claims (5)

A yoke having an L-shaped, fixed portion with a rectangular through hole drilled on one end side;
Formed in a columnar shape having a longer cross section in at least one of the longitudinal direction and the direction perpendicular to the through hole, the protrusion portion having a slightly smaller protrusion surface on the one end side than the through hole and the flange portion on the other end And an iron core that is fixed to the yoke by inserting the protrusion into the through hole and caulking the tip side thereof,
A coil bobbin used for an electromagnet of an electromagnetic relay composed of a coil wound around the iron core,
The coil bobbin is a coil bobbin structure of an electromagnetic relay that has a hook partially formed with a notch for inserting a fixing jig and is interposed between the iron core and the coil. The coil bobbin structure for an electromagnetic relay according to claim 1, wherein the coil bobbin is formed in a shape having a U-shaped cross section and having a flange at both ends, and the notch is formed in a flange located on the flange portion side of the iron core. The coil bobbin structure for an electromagnetic relay according to claim 1, wherein the coil bobbin is formed in a cylindrical shape having ridges at both ends, and the notches are formed in a ridge located on the flange portion side of the iron core. The coil bobbin structure of the electromagnetic relay according to any one of claims 1 to 3, wherein a protrusion that restricts the movement of the card is formed on the flange located on the flange portion side of the iron core. In the method of fixing the iron core in the electromagnet of the electromagnetic relay comprised by the coil bobbin with the coil bobbin structure of the electromagnetic relay in any one of Claims 1-4, the said yoke, the said iron core, and the said coil. There,
While fixing the yoke and the iron core in a state where the protrusion is inserted into the through hole from a total of five directions of the outer peripheral 4 direction of the fixing portion and one direction on the flange portion, When carrying out spin caulking so as to fill a gap formed between the through hole and the protrusion with respect to the iron core from the through hole, the fixing jig further passes the notch through the notch. An iron core fixing method for an electromagnetic relay that fixes the iron core.

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