Electromagnetic relay

Abstract

This electromagnetic relay comprises a contact part, an electromagnet part, and a base. The contact part includes a fixed terminal and a movable terminal. The movable terminal is positioned facing the fixed terminal. The electromagnet part includes a coil that generates an electromagnetic force for operating the movable terminal. The base supports the contact part and the electromagnet part. The base includes a first inner wall and a first outer wall. The first inner wall extends upward from an upper surface of the base. The electromagnet part is attached to the first inner wall. The first outer wall extends upward from the upper surface of the base and is positioned outside the first inner wall.

Description

Electromagnetic relay

[0001] The present invention relates to an electromagnetic relay.

[0002] Some electromagnetic relays include a contact portion, an electromagnet portion, and a base. The contact portion includes a movable terminal and a fixed terminal. The electromagnet portion generates an electromagnetic force for operating the movable terminal. The base supports the contact portion and the electromagnet portion. For example, in the electromagnetic relay of Patent Document 1, the base includes a wall portion for supporting the electromagnet portion. The wall portion extends upward from the upper surface of the base. The wall portion includes a mounting groove. By inserting a part of the electromagnet portion into the mounting groove of the wall portion, the electromagnet portion is attached to the base.

[0003] Japanese Patent Application Laid-Open No. 2019-175602

[0004] In the above-described electromagnetic relay, when the base is molded, the base may be deformed due to an external force or the influence of the surrounding environment. When the base is deformed, the positions of the electromagnet portion and the contact portion change, and the characteristics of the electromagnetic relay may change. Therefore, it is preferable to improve the rigidity of the base. For example, by increasing the height of the wall portion of the base, the rigidity of the base can be improved. However, in that case, the mounting groove becomes deeper, and when attaching the electromagnet portion to the base, it is necessary to insert a part of the electromagnet portion deeper into the mounting groove. Therefore, when assembling the electromagnet portion to the base, the electromagnet portion may scrape the mounting groove and resin chips may be generated. Also, attention must be paid to insufficient assembly of the electromagnet portion to the base. As a result, the assembly property of the electromagnet portion to the base deteriorates. An object of the present invention is to improve the rigidity of the base in an electromagnetic relay and suppress a decrease in the assembly property of the electromagnet portion to the base.

[0005] An electromagnetic relay according to one aspect of the present invention comprises a contact portion, an electromagnet portion, and a base. The contact portion includes a fixed terminal and a movable terminal. The movable terminal is positioned opposite the fixed terminal. The electromagnet portion includes a coil that generates an electromagnetic force for operating the movable terminal. The base supports the contact portion and the electromagnet portion. The base includes a first inner wall and a first outer wall. The first inner wall extends upward from the upper surface of the base. The electromagnet portion is attached to the first inner wall. The first outer wall extends upward from the upper surface of the base and is positioned outside the first inner wall.

[0006] In the electromagnetic relay according to this embodiment, the first outer wall is positioned outside the first inner wall. Therefore, the rigidity of the base can be improved by the first outer wall. Furthermore, the electromagnet is attached to the first inner wall. Therefore, even if the first outer wall has a shape that improves the rigidity of the base, the reduction in the ease of assembling the electromagnet to the base is suppressed.

[0007] The first exterior wall may be higher than the first interior wall. In this case, the higher the first exterior wall, the greater the rigidity of the base.

[0008] The first outer wall may include a partition wall positioned between the contact portion and the electromagnet portion. In this case, the partition wall improves the rigidity of the base. Furthermore, the partition wall increases the insulation distance between the contact portion and the electromagnet portion, thereby improving the insulation between the contact portion and the electromagnet portion.

[0009] The base may include a groove positioned between the first inner wall and the partition wall. In this case, the groove increases the insulation distance between the contact portion and the electromagnet portion. This improves the insulation between the contact portion and the electromagnet portion.

[0010] The electromagnetic relay may further include a card positioned between the contact portion and the electromagnet portion. The electromagnet portion may include an anode that operates by the electromagnetic force of the coil. The card may include a contact portion that contacts the anode. The groove may be positioned below the contact portion. In this case, wear particles generated by the contact between the contact portion and the positive portion of the card are collected in the groove. This suppresses the reduction in insulation between the contact portion and the electromagnet portion due to wear particles.

[0011] The base may include a first rib extending from the first inner wall to the partition wall within the groove. In this case, the rigidity of the base is improved by the first rib.

[0012] The first outer wall may include a first outer wall and a second outer wall. The first outer wall may be located on one side of the first inner wall. The second outer wall may be located on the other side of the first inner wall. In this case, the rigidity of the base is improved by the first outer wall and the second outer wall.

[0013] The electromagnet section may include a yoke. The first inner wall may include a mounting groove to which the yoke is attached. In this case, the electromagnet section is attached to the base by the yoke being attached to the mounting groove.

[0014] The base may include a second inner wall and a second outer wall. The second inner wall may extend upward from the top surface of the base, and movable terminals or fixed terminals may be attached to the second inner wall. The second outer wall may extend upward from the top surface of the base and be located outside the second inner wall. In this case, the second outer wall is located outside the second inner wall. Therefore, the rigidity of the base can be improved by the second outer wall. Also, the movable terminals or fixed terminals are attached to the second inner wall. Therefore, even if the second outer wall has a shape that improves the rigidity of the base, the reduction in the ease of assembling the movable terminals or fixed terminals to the base is suppressed.

[0015] The second exterior wall may be higher than the second interior wall. In this case, the higher the second exterior wall, the greater the rigidity of the base.

[0016] The second outer wall may include a third outer wall and a fourth outer wall. The third outer wall may be located on one side of the second inner wall. The fourth outer wall may be located on the other side of the second inner wall. In this case, the rigidity of the base is improved by the third and fourth outer walls.

[0017] The first outer wall may include a partition wall positioned between the contact point and the electromagnet. The base may include a second rib extending from the second inner wall to the partition wall. In this case, the second rib improves the rigidity of the base.

[0018] According to the present invention, in an electromagnetic relay, the rigidity of the base is improved, and the decrease in the ease of assembling the electromagnet to the base is suppressed.

[0019] A perspective view of an electromagnetic relay according to an embodiment. A perspective view of an electromagnetic relay. A cross-sectional view of an electromagnetic relay. A cross-sectional view of an electromagnetic relay. A perspective view of a base. A perspective view of a base. A side view of a base. A top view of a base. A rear view of a base. A cross-sectional view of a base.

[0020] Hereinafter, an electromagnetic relay according to an embodiment will be described with reference to the drawings. Figures 1 and 2 are perspective views of the electromagnetic relay 1. Figures 3 and 4 are cross-sectional views of the electromagnetic relay 1. As shown in Figures 1 to 4, the electromagnetic relay 1 includes a contact portion 2, an electromagnet portion 3, a base 4, a case 5, and a card 6.

[0021] Note that Case 5 is omitted in Figures 2 to 4. In the following explanation, the direction in which the contact portion 2, electromagnet portion 3, and card 6 are arranged relative to the base 4 is defined as upward, and the opposite direction is defined as downward. The direction from the electromagnet portion 3 toward the contact portion 2 is defined as forward, and the opposite direction is defined as backward. Also, the left and right directions when facing forward are defined as left and right, respectively. However, these directional definitions are used for the convenience of explanation and do not limit the arrangement direction of the electromagnetic relay 1.

[0022] The contact section 2 includes a fixed terminal 11, a fixed contact 12, a movable terminal 13, and a movable contact 14. The fixed terminal 11 and the fixed contact 12 are made of a conductive material. The fixed contact 12 is connected to the fixed terminal 11. The fixed terminal 11 is supported by the base 4. The fixed terminal 11 extends upward from the base 4. The lower end of the fixed terminal 11 protrudes downward from the base 4 to the outside of the electromagnetic relay 1.

[0023] The movable terminal 13 and the movable contact 14 are made of a conductive material. The movable contact 14 is connected to the movable terminal 13. The movable terminal 13 is supported by the base 4. The movable terminal 13 extends upward from the base 4. The lower end of the movable terminal 13 protrudes downward from the base 4 to the outside of the electromagnetic relay 1. The movable terminal 13 is made of an elastic material. The movable terminal 13 is positioned between the fixed terminal 11 and the electromagnet 3. The movable terminal 13 is positioned opposite the fixed terminal 11. The movable contact 14 is positioned opposite the fixed contact 12.

[0024] The electromagnet unit 3 operates the movable terminal 13 by electromagnetic force. The electromagnet unit 3 is supported by the base 4. The electromagnet unit 3 includes a coil 15, a spool 16, an iron core 17, a yoke 18, and an armature 19. The coil 15 is wound around the spool 16. The coil 15 is connected to coil terminals 21 and 22. The coil terminals 21 and 22 are supported by the spool 16 or the base 4. As shown in Figure 3, the spool 16 includes a hole 20 that extends in the vertical direction. The iron core 17 is inserted into the hole 20 of the spool 16.

[0025] The yoke 18 has an L-shaped bend. The yoke 18 is connected to the iron core 17. The yoke 18 has a yoke bottom 23 and a yoke side 24. The yoke bottom 23 is located below the coil 15. The lower end of the iron core 17 is connected to the yoke bottom 23. The yoke side 24 is located to the side of the coil 15. The yoke side 24 extends in the vertical direction.

[0026] The armature 19 is rotatably supported at a support point 25 on the yoke side 24. The support point 25 is located at the upper end of the yoke side 24. The armature 19 operates by an electromagnetic force generated from the coil 15. The armature 19 includes an armature upper part 26 and an armature side part 27. The armature 19 has a bent shape between the armature upper part 26 and the armature side part 27. The armature upper part 26 is positioned above the iron core 17. The armature upper part 26 is positioned opposite the iron core 17. The armature side part 27 is positioned opposite the card 6. The armature side part 27 is positioned between the yoke side part 24 and the card 6.

[0027] A hinge spring 28 is attached to the anode 19 and the yoke 18. The hinge spring 28 is made of an elastic material. The hinge spring 28 is a leaf spring. The hinge spring 28 biases the anode 19 so that it does not separate from the yoke 18 at the support point 25.

[0028] The base 4 is made of an insulating material. The base 4 is made of resin. However, the base 4 may be made of a material other than resin. The base 4 supports the contact portion 2 and the electromagnet portion 3. The case 5 is attached to the base 4. The case 5 covers the fixed terminal 11, the movable terminal 13, the electromagnet portion 3, and the card 6.

[0029] Card 6 is positioned between the abutment 19 and the movable terminal 13. Card 6 is made of resin. Card 6 is insulating. Card 6 is connected to the abutment 19 and the movable terminal 13. Card 6 is movable in the contact direction and the separation direction and transmits the operation of the abutment 19 to the movable terminal 13. The contact direction is the direction in which the movable contact 14 contacts the fixed contact 12. The separation direction is the direction in which the movable contact 14 moves away from the fixed contact 12. In this embodiment, the contact direction is forward and the separation direction is backward.

[0030] Card 6 includes a first connecting portion 31, a second connecting portion 32, a first contact portion 33, and a second contact portion 34. The first connecting portion 31 is connected to the abutment 19. The second connecting portion 32 is connected to the movable terminal 13. The first contact portion 33 contacts the abutment 19. The second contact portion 34 contacts the movable terminal 13.

[0031] When the coil 15 is not energized, as shown in Figure 3, the upper part 26 of the abutment is separated from the iron core 17 by the elastic force of the movable terminal 13. Therefore, the card 6 is in the separated position shown in Figure 3. When the card 6 is in the separated position, the movable contact 14 is separated from the fixed contact 12.

[0032] When the coil 15 is energized, as shown in Figure 4, the upper part 26 of the axle is attracted to the iron core 17 by the electromagnetic force of the coil 15. As a result, the axle 19 rotates around the support point 25 of the yoke side 24 against the elastic force of the movable terminal 13. The card 6 is pressed against the axle side 27 in the contact direction and moves to the contact position shown in Figure 4. The card 6 presses the movable terminal 13 in the contact direction against the elastic force of the movable terminal 13. As a result, the movable contact 14 moves in the contact direction and makes contact with the fixed contact 12.

[0033] When the coil 15 is demagnetized, the elastic force of the movable terminal 13 causes the upper part 26 of the axle to separate from the iron core 17. The card 6 moves in the separation direction and returns to the separated position shown in Figure 3. As a result, the movable contact 14 separates from the fixed contact 12.

[0034] Next, we will describe the base 4 in detail. Figures 5 and 6 are perspective views of the base 4. Figure 7 is a side view of the base 4. Figure 8 is a top view of the base 4. Figure 9 is a rear view of the base 4. Figure 10 is a cross-sectional view of the base 4.

[0035] The base 4 includes a bottom portion 40, a first inner wall 41, a first outer wall 42, a second inner wall 43, and a second outer wall 44. The first inner wall 41, the first outer wall 42, the second inner wall 43, and the second outer wall 44 extend upward from the upper surface of the bottom portion 40. Holes 45 and 46 are provided in the bottom portion 40. The holes 45 and 46 extend vertically through the bottom portion 40. Coil terminals 21 and 22 are passed through the holes 45 and 46.

[0036] The electromagnet unit 3 is attached to the first inner wall 41. The first inner wall 41 includes a mounting groove 47. The mounting groove 47 extends in the vertical direction. The mounting groove 47 opens upward. The mounting groove 47 opens rearward. As shown in Figure 3, a yoke 18 is attached to the mounting groove 47. The yoke 18 is press-fitted into the mounting groove 47. This attaches the electromagnet unit 3 to the base 4.

[0037] The first inner wall 41 includes an inner front wall 50, a first inner wall 51, and a second inner wall 52. The inner front wall 50 is located in front of the mounting groove 47. The inner front wall 50 extends in the left-right direction. The first inner wall 51 is located to the right of the mounting groove 47. The first inner wall 51 extends rearward from the right end of the inner front wall 50. The second inner wall 52 is located to the left of the mounting groove 47. The second inner wall 52 extends rearward from the left end of the inner front wall 50.

[0038] The first outer wall 42 is located outside the first inner wall 41. The first outer wall 42 surrounds the first inner wall 41 from the front, right, and left. The first outer wall 42 is higher than the first inner wall 41. The first outer wall 42 includes a partition wall 53, a first outer wall 54, and a second outer wall 55. The partition wall 53 extends in the left-right direction. The partition wall 53 is located between the contact portion 2 and the electromagnet portion 3. The partition wall 53 faces the first inner wall 41 and is located in front of the first inner wall 41. As shown in Figure 10, the upper end 86 of the partition wall 53 is located above the upper end 62 of the first inner wall 41.

[0039] The partition wall 53 is positioned away from the first inner wall 41 in the front-rear direction. A first groove 57 is provided between the partition wall 53 and the first inner wall 41. The first groove 57 extends in the left-right direction. The first groove 57 extends in the up-down direction and opens upward. As shown in Figure 3, the first groove 57 is positioned below the first contact portion 33. As shown in Figure 8, the base 4 includes a plurality of first ribs 58-60. The plurality of first ribs 58-60 are positioned within the first groove 57. The plurality of first ribs 58-60 are positioned side by side. The plurality of first ribs 58-60 protrude upward from the upper surface of the bottom portion 40. The plurality of first ribs 58-60 extend in the front-rear direction. The plurality of first ribs 58-60 extend from the first inner wall 41 to the partition wall 53.

[0040] The first outer wall 54 is disposed to the right of the first inner wall 41. The first outer wall 54 is disposed away from the first inner wall 41 to the right. The first outer wall 54 is disposed to the right of the electromagnet portion 3. The first outer wall 54 extends rearward from the partition wall 53. As shown in FIG. 9, the upper end 61 of the first outer wall 54 is located above the upper end 62 of the first inner wall 41. The rear end 63 of the first outer wall 54 is inclined rearward and downward.

[0041] The second outer wall 55 is disposed to the left of the first inner wall 41. The second outer wall 55 is disposed away from the first inner wall 41 to the left. The second outer wall 55 is disposed to the left of the electromagnet portion 3. The second outer wall 55 extends rearward from the partition wall 53. The upper end 64 of the second outer wall 55 is located above the upper end 62 of the first inner wall 41. The rear end 65 of the second outer wall 55 is inclined rearward and downward.

[0042] The base 4 includes a rear wall 56. The rear wall 56 is disposed behind the first outer wall 42. The rear wall 56 extends in the left - right direction. The rear wall 56 is connected to the rear end of the first outer wall 54 and the rear end of the second outer wall 55. The rear wall 56 is lower than the first outer wall 42. The rear wall 56 is lower than the first inner wall 41.

[0043] The second inner wall 43 is disposed in front of the partition wall 53. A movable terminal 13 and a fixed terminal 11 are attached to the second inner wall 43. The second inner wall 43 is lower than the first inner wall 41. The second inner wall 43 supports the movable terminal 13. The second inner wall 43 extends in the left - right direction. The second inner wall 43 includes a first support hole 66. The first support hole 66 extends vertically through the second inner wall 43. The movable terminal 13 is press - fitted into the first support hole 66. The movable terminal 13 projects below the base 4 through the first support hole 66.

[0044] The base 4 includes a plurality of second ribs 67 - 69. The plurality of second ribs 67 - 69 are disposed between the partition wall 53 and the second inner wall 43. The plurality of second ribs 67 - 69 are arranged side by side in the left - right direction. The plurality of second ribs 67 - 69 extend in the front - rear direction. The plurality of second ribs 67 - 69 are connected to the partition wall 53 and the second inner wall 43.

[0045] The second outer wall 44 is disposed outside the second inner wall 43. The second outer wall 44 surrounds the second inner wall 43 from the front, right, and left. The second outer wall 44 is higher than the second inner wall 43. The second outer wall 44 is lower than the first outer wall 42. The second outer wall 44 is lower than the first inner wall 41. The second outer wall 44 includes a front wall 70, a third outer wall 71, and a fourth outer wall 72.

[0046] The front wall 70 extends in the left - right direction. The front wall 70 faces the second inner wall 43 and is disposed in front of the second inner wall 43. The upper end 73 of the front wall 70 is located above the upper end 74 of the second inner wall 43. The front wall 70 supports the fixed terminal 11. The front wall 70 includes a second support hole 75. The second support hole 75 extends vertically through the front wall 70. The fixed terminal 11 is press - fitted into the second support hole 75. The fixed terminal 11 projects downward from the base 4 through the second support hole 75.

[0047] The front wall 70 is disposed away from the second inner wall 43 in the front - rear direction. A second concave groove 76 is provided between the front wall 70 and the second inner wall 43. The second concave groove 76 extends in the left - right direction. The second concave groove 76 extends vertically and opens upward. As shown in FIG. 3, the second concave groove 76 is disposed below the second connecting portion 32.

[0048] The third outer wall 71 is disposed on the right side of the second inner wall 43. The third outer wall 71 is disposed away from the second inner wall 43 to the right. The third outer wall 71 extends rearward from the front wall 70. The third outer wall 71 is connected to the first outer wall 54. The third outer wall 71 is provided integrally with the first outer wall 54. The upper end 77 of the third outer wall 71 is located above the upper end 74 of the second inner wall 43. The upper end 77 of the third outer wall 71 is located below the upper end 61 of the first outer wall 54. The upper end 77 of the third outer wall 71 includes a first recess 78. The first recess 78 is recessed downward from the upper end 77 of the third outer wall 71. The first recess 78 is located on the right side of the second inner wall 43. A first locking projection 79 is provided on the outer surface of the third outer wall 71. The first locking projection 79 locks to the case 5.

[0049] The fourth outer wall 72 is located to the left of the second inner wall 43. The fourth outer wall 72 is located away to the left of the second inner wall 43. The fourth outer wall 72 extends rearward from the front wall 70. The fourth outer wall 72 is connected to the second outer wall 55. The fourth outer wall 72 is integrally provided with the second outer wall 55. The upper end 81 of the fourth outer wall 72 is located above the upper end 74 of the second inner wall 43. The upper end 81 of the fourth outer wall 72 is located below the upper end 64 of the second outer wall 55. The upper end 81 of the fourth outer wall 72 includes a second recess 82, which is recessed downward from the upper end 81 of the fourth outer wall 72. The second recess 82 is located to the left of the second inner wall 43. A second locking projection 83 is provided on the outer surface of the fourth outer wall 72. The second locking projection 83 locks into the case 5.

[0050] Base 4 includes a first transverse rib 84 and a second transverse rib 85. The first transverse rib 84 is positioned between the third outer wall 71 and the second inner wall 43. The first transverse rib 84 extends in the left-right direction. The first transverse rib 84 is connected to the third outer wall 71 and the second inner wall 43. The second transverse rib 85 is positioned between the fourth outer wall 72 and the second inner wall 43. The second transverse rib 85 extends in the left-right direction. The second transverse rib 85 is connected to the fourth outer wall 72 and the second inner wall 43.

[0051] In the electromagnetic relay 1 according to this embodiment, the first outer wall 42 is arranged outside the first inner wall 41. Therefore, the rigidity of the base 4 can be improved by the first outer wall 42. In addition, the electromagnet 3 is attached to the first inner wall 41. Therefore, even if the first outer wall 42 has a shape that improves the rigidity of the base 4, a decrease in the ease of assembling the electromagnet 3 to the base 4 is suppressed.

[0052] Furthermore, a second outer wall 44 is positioned outside the second inner wall 43. Therefore, the rigidity of the base 4 can be improved by the second outer wall 44. Also, the movable terminal 13 is attached to the second inner wall 43. Therefore, even if the second outer wall 44 has a shape that improves the rigidity of the base 4, the reduction in the ease of assembling the movable terminal 13 to the base 4 is suppressed.

[0053] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the invention.

[0054] The configuration of the electromagnetic relay 1 is not limited to that of the above embodiment and may be modified. For example, the fixed terminal 11 and the movable terminal 13 may be arranged opposite to each other. In that case, the contact direction and the separation direction may be opposite to those of the above embodiment. The fixed terminal 11 may be attached to the second inner wall 43.

[0055] The shape of the base 4 or case 5 is not limited to that of the above embodiment and may be changed. For example, the shape of the first outer wall 42 is not limited to that of the above embodiment and may be changed. The shape of the first inner wall 41 is not limited to that of the above embodiment and may be changed. The shape of the second outer wall 44 is not limited to that of the above embodiment and may be changed. The shape of the second inner wall 43 is not limited to that of the above embodiment and may be changed. The arrangement, shape, or number of the first ribs 58-60 is not limited to that of the above embodiment and may be changed. The arrangement, shape, or number of the second ribs 67-69 is not limited to that of the above embodiment and may be changed.

[0056] According to the present invention, in an electromagnetic relay, the rigidity of the base is improved, and the decrease in the ease of assembling the electromagnet to the base is suppressed.

[0057] 2: Contact part, 3: Electromagnet part, 4: Base, 6: Card, 11: Fixed terminal, 13: Movable terminal, 15: Coil, 18: Yoke, 19: Axis, 33: First contact part, 41: First inner wall, 42: First outer wall, 43: Second inner wall, 44: Second outer wall, 47: Mounting groove, 53: Partition wall, 54: First outer wall, 55: Second outer wall, 57: First recessed groove, 58-60: First rib, 67-69: Second rib, 71: Third outer wall, 72: Fourth outer wall

Claims

1. An electromagnetic relay comprising: a contact portion including a fixed terminal and a movable terminal arranged opposite to the fixed terminal; an electromagnet portion including a coil for generating an electromagnetic force to operate the movable terminal; and a base supporting the contact portion and the electromagnet portion, wherein the base includes: a first inner wall extending upward from the upper surface of the base to which the electromagnet portion is attached; and a first outer wall extending upward from the upper surface of the base and arranged outside the first inner wall.

2. The electromagnetic relay according to claim 1, wherein the first outer wall is higher than the first inner wall.

3. The electromagnetic relay according to claim 1, wherein the first outer wall includes a partition wall disposed between the contact portion and the electromagnet portion.

4. The electromagnetic relay according to claim 3, wherein the base includes a groove disposed between the first inner wall and the partition wall.

5. The electromagnetic relay according to claim 4, further comprising a card disposed between the contact portion and the electromagnet portion, wherein the electromagnet portion includes an axle that operates by the electromagnetic force of the coil, the card includes a contact portion that contacts the axle, and the groove is disposed below the contact portion.

6. The electromagnetic relay according to claim 4, wherein the base includes a first rib extending from the first inner wall to the partition wall within the groove.

7. The electromagnetic relay according to claim 1, wherein the first outer wall includes a first outer wall disposed on one side of the first inner wall and a second outer wall disposed on the other side of the first inner wall.

8. The electromagnetic relay according to claim 1, wherein the electromagnet portion includes a yoke, and the first inner wall includes a mounting groove to which the yoke is attached.

9. The electromagnetic relay according to claim 1, wherein the base includes a second inner wall extending upward from the upper surface of the base to which the movable terminal or the fixed terminal is attached, and a second outer wall extending upward from the upper surface of the base and positioned outside the second inner wall.

10. The electromagnetic relay according to claim 9, wherein the second outer wall is higher than the second inner wall.

11. The electromagnetic relay according to claim 9, wherein the second outer wall includes a third outer wall disposed on one side of the second inner wall and a fourth outer wall disposed on the other side of the second inner wall.

12. The electromagnetic relay according to claim 9, wherein the first outer wall includes a partition wall disposed between the contact portion and the electromagnet portion, and the base includes a second rib extending from the second inner wall to the partition wall.

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