Electromagnetic relay

Abstract

The invention provides an electromagnetic relay, which suppresses the enlargement of the electromagnetic relay, and improves the insulation between an iron core and a fixed terminal. The electromagnetic relay includes a fixed contact, a fixed terminal, a coil, an iron core, and a spool. The fixed terminal includes a contact support portion on which a fixed contact is provided. The coil is disposed such that the central axis extends in the front-rear direction. The coil is arranged behind the fixed terminal. The iron core comprises a shaft part and a head part. The shaft portion is disposed within the coil and extends in the front-rear direction. The head part is connected with the front end of the shaft part. A coil is wound around the spool. The spool includes a bore and a flange. The shaft portion is disposed in the hole. The flange includes a first front surface and a second front surface. A hole opens in the first front surface. The first front surface is disposed rearward of the head portion so as to face the head portion. The second front surface is disposed rearward of the contact support portion so as to face the contact support portion. The second front surface is rearward away from the first front surface by a predetermined distance. The predetermined distance is greater than a thickness of the contact support portion in the front-rear direction.

Description

Technical Field

[0001] The invention relates to an electromagnetic relay. Background Art

[0002] Among electromagnetic relays, there are electromagnetic relays having a coil, a winding drum, an iron core, an armature, a movable piece, and a movable contact. For example, in the electromagnetic relay of Patent Document 1, a coil is wound on the winding drum. The iron core is inserted into the hole of the winding drum, and the head of the iron core is arranged on the outer side of the flange of the winding drum. The armature is arranged opposite to the head. The armature is connected to the movable piece provided with a movable contact. The armature is attracted to the head by the electromagnetic force generated by the coil. As a result, the movable piece is elastically deformed, and the movable contact contacts with the fixed contact.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 6344282

[0006] In the above-mentioned electromagnetic relay, the head of the iron core and the fixed terminal are arranged opposite to the flange of the winding drum. Therefore, the insulation distance between the iron core and the fixed terminal is small. Furthermore, the insulation between the iron core and the fixed terminal is reduced. If the fixed terminal is arranged much away from the head, the insulation distance between the iron core and the fixed terminal becomes larger. However, in this case, the electromagnetic relay becomes large. Summary of the invention

[0007] An object of the present invention is to suppress an increase in the size of an electromagnetic relay and to improve the insulation between an iron core and a fixed terminal.

[0008] The electromagnetic relay of the present invention comprises a fixed contact, a fixed terminal, a coil, an iron core and a winding drum. The fixed terminal comprises a contact support portion on which the fixed contact is arranged. The coil is arranged in such a manner that the central axis extends in the front-to-back direction. The coil is arranged behind the fixed terminal. The iron core comprises a shaft portion and a head portion. The shaft portion is arranged in the coil and extends in the front-to-back direction. The head portion is connected to the front end of the shaft portion. The coil is wound on the winding drum. The winding drum comprises a hole and a flange. The shaft portion is arranged in the hole. The flange comprises a first front surface and a second front surface. The hole opens on the first front surface. The first front surface is arranged behind the head portion opposite to the head portion. The second front surface is arranged behind the contact support portion opposite to the contact support portion. The second front surface is separated from the first front surface to the rear by a predetermined distance. The predetermined distance is greater than the thickness of the contact support portion in the front-to-back direction.

[0009] In the electromagnetic relay of this mode, the second front surface is thicker than the contact support portion in the front-to-back direction and is spaced away from the first front surface to the rear. The shape of the flange of the winding drum can compactly arrange the fixed terminal and increase the insulation distance between the iron core and the fixed terminal in the front-to-back direction. Thus, the electromagnetic relay is prevented from becoming larger and the insulation between the iron core and the fixed terminal is improved.

[0010] The contact support portion as a whole may also be located at a position further back than the first front surface. In this case, the insulation distance between the iron core and the fixed terminal becomes larger in the front-to-back direction. Thus, the electromagnetic relay is prevented from becoming larger in size, and the insulation between the iron core and the fixed terminal is improved.

[0011] The contact support portion as a whole may also be located at a position further back than the head portion. In this case, the insulation distance between the iron core and the fixed terminal becomes larger in the front-to-back direction. Thus, the electromagnetic relay is prevented from becoming larger in size, and the insulation between the iron core and the fixed terminal is improved.

[0012] The flange may include a third front surface disposed around the first front surface. The third front surface may be located behind the first front surface. In this case, the winding drum becomes small. Thus, the electromagnetic relay can be prevented from becoming larger.

[0013] The second front surface may also be located at a position further back than the third front surface. In this case, the insulation distance between the iron core and the fixed terminal increases in the front-to-back direction. Thus, the electromagnetic relay is prevented from becoming larger in size, and the insulation between the iron core and the fixed terminal is improved.

[0014] The fixed terminal may also include a locking portion. The flange may also include a support portion for mounting the locking portion. The support portion may also protrude forward from the third front surface. In this case, the winding drum becomes small, but the fixed terminal is stably supported by the support portion.

[0015] The electromagnetic relay may also include a movable contact, a movable piece, and an armature. The movable contact may also be arranged opposite to the fixed contact. The movable contact may also be provided on the movable piece. The armature may also be mounted on the movable piece. The contact support portion may also be arranged below the head. Alternatively, the armature is attracted to the core by the electromagnetic force generated by the coil, so that the armature contacts the head at a position lower than the center axis. In this case, it is ensured that the contact pressure between the movable contact and the fixed contact is large.

[0016] According to the present invention, the insulation between the core and the fixed terminal is improved while suppressing the increase in size of the electromagnetic relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a perspective view of the electromagnetic relay according to the embodiment.

[0018] Figure 2 It is a perspective view of the electromagnetic relay according to the embodiment.

[0019] Figure 3 It is a side view of an electromagnetic relay.

[0020] Figure 4 is a sectional side view of an electromagnetic relay.

[0021] Figure 5 This is a three-dimensional view of an electromagnetic relay with the common terminal, movable piece, and armature omitted.

[0022] Figure 6 This is an exploded perspective view of the reel and base.

[0023] Figure 7 is a three-dimensional diagram of the first fixed terminal.

[0024] Figure 8 yes Figure 4 Magnified image of .

[0025] Fig. 9 This is a perspective view of the electromagnetic relay viewed from below, with the common terminal, movable piece, and armature omitted.

[0026] Fig.10 is a perspective view of the second fixed terminal.

[0027] Fig.11 It is a cross-sectional top view of an electromagnetic relay.

[0028] Fig.12 It is an enlarged side view of the electromagnetic relay.

[0029] Fig.13 It is an enlarged side view of the electromagnetic relay.

[0030] Explanation of symbols

[0031] 11: first fixed terminal; 13: first fixed contact; 16: movable piece; 17: armature; 18: movable contact; 21: coil; 23: iron core; 24: hole; 25: first flange; 28: shaft; 29: head; 22: winding drum; 35: first front surface; 36: second front surface; 37: third front surface; 45: first locking portion; 41: first supporting portion; 47: first contact supporting portion. DETAILED DESCRIPTION

[0032] Hereinafter, an electromagnetic relay according to an embodiment will be described with reference to the drawings. Figure 1 and Figure 2 It is a perspective view of the electromagnetic relay 1 according to the embodiment. Figure 3 is a side view of the electromagnetic relay 1. Figures 1 to 3 As shown, the electromagnetic relay 1 includes a housing 2, a contact device 3 and a drive device 4. The contact device 3 and the drive device 4 are arranged in the housing 2.

[0033] The housing 2 includes a base 5 and a shell 6. The base 5 supports the drive device 4. The shell 6 is mounted on the base 5 and covers the drive device 4 and the contact device 3. The base 5 and the shell 6 are formed of insulating materials such as resin. Alternatively, the base 5 and the shell 6 can also be made of other insulating materials such as ceramics. In addition, Figure 2 and Figure 3 The housing 6 is omitted.

[0034] The contact device 3 includes a first fixed terminal 11, a second fixed terminal 12, a first fixed contact 13, a second fixed contact 14, a common terminal 31, a movable piece 16, an armature 17, and a movable contact 18. The first fixed terminal 11, the second fixed terminal 12, the first fixed contact 13, the second fixed contact 14, the movable contact 18, the common terminal 31, and the movable piece 16 are made of conductive metal. The armature 17 is made of a magnetic body.

[0035] In addition, in the following description, the direction in which the second fixed contact 14 is arranged relative to the first fixed contact 13 is defined as "front", and the opposite direction is defined as "rear". The direction in which the contact device 3 and the drive device 4 are arranged relative to the base 5 is defined as "upward", and the opposite direction is defined as "downward". In addition, the left and right directions facing the front are defined as "left" and "right", respectively. The above directions are defined for the convenience of description and are not limited to the directions in which the electromagnetic relay 1 is used.

[0036] The driving device 4 uses electromagnetic force to operate the contact device 3. The driving device 4 includes a coil 21, a winding drum 22, a yoke 15, and an iron core 23. The coil 21 is wound around the winding drum 22. The winding drum 22 is supported by the base 5. Figure 3 As shown, the winding drum 22 and the coil 21 are arranged such that the central axis A1 of the coil 21 faces the front-rear direction. The winding drum 22 is made of an insulating material such as resin. The iron core 23 is connected to the yoke 15.

[0037] The winding drum 22 includes a first flange 25, a second flange 26, and a central flange 27. The first flange 25, the second flange 26, and the central flange 27 protrude in the radial direction of the coil 21. The first flange 25 is located at the front end of the winding drum 22. The second flange 26 is located at the rear end of the winding drum 22. The central flange 27 is arranged between the first flange 25 and the second flange 26 in the front-back direction. The first flange 25 is opposite to the first fixed terminal 11. The second flange 26 is opposite to the common terminal 31. The central flange 27 is arranged between the first fixed terminal 11 and the common terminal 31.

[0038] Figure 4 2 is a cross-sectional side view of the coil 21 along the central axis A1. Figure 4 As shown, the winding drum 22 includes a hole 24. The hole 24 extends in the front-to-back direction. The iron core 23 includes a shaft portion 28 and a head portion 29. The shaft portion 28 extends in the front-to-back direction and is arranged in the hole 24 of the winding drum 22. The head portion 29 is connected to the front end of the shaft portion 28. The head portion 29 has a larger outer diameter than the shaft portion 28. The head portion 29 is arranged in front of the first flange 25.

[0039] A portion of the first fixed terminal 11 protrudes from the base 5 to the outside of the electromagnetic relay 1. The first fixed terminal 11 is supported by the winding drum 22. The first fixed terminal 11 is arranged in front of the coil 21. The first fixed terminal 11 is arranged in front of the first flange 25. The first fixed terminal 11 is mounted on the first flange 25. The first fixed terminal 11 is provided with a first fixed contact 13.

[0040] A portion of the second fixed terminal 12 protrudes from the base 5 to the outside of the electromagnetic relay 1. The second fixed terminal 12 is supported by the winding drum 22. The second fixed terminal 12 is arranged in front of the coil 21. The second fixed terminal 12 is arranged in front of the first fixed terminal 11. The second fixed terminal 12 is mounted on the central flange 27. The second fixed terminal 12 is provided with a second fixed contact 14.

[0041] A portion of the common terminal 31 protrudes from the base 5 to the outside of the electromagnetic relay 1. The common terminal 31 is formed integrally with the yoke 15. The common terminal 31 is supported by the winding drum 22 via the yoke 15. The common terminal 31 is arranged behind the coil 21. The common terminal 31 is arranged behind the second flange 26. The common terminal 31 is mounted on the second flange 26 via the yoke 15.

[0042] The common terminal 31 extends in the up-down direction. The lower end of the common terminal 31 protrudes downward from the base 5. The yoke 15 extends upward from the common terminal 31 and has an L-shaped shape. The yoke 15 includes a horizontal portion 32. The horizontal portion 32 extends in the front-back direction. The horizontal portion 32 is arranged above the winding drum 22. The horizontal portion 32 is arranged above the first flange 25, the second flange 26, and the center flange 27.

[0043] The movable piece 16 is connected to the common terminal 31 via the yoke 15. The movable contact 18 is provided on the movable piece 16. The movable piece 16 has elasticity. The movable piece 16 includes a leaf spring portion 33 and a movable support portion 34. The movable piece 16 has a shape bent between the leaf spring portion 33 and the movable support portion 34. The leaf spring portion 33 is arranged above the horizontal portion 32 of the yoke 15. The leaf spring portion 33 is fixed to the horizontal portion 32. The movable support portion 34 is arranged in front of the winding drum 22. The movable support portion 34 extends in the up-down direction. The lower portion of the movable support portion 34 is arranged between the first fixed terminal 11 and the second fixed terminal 12. The movable contact 18 is provided at the lower portion of the movable support portion 34. The movable contact 18 is arranged between the first fixed terminal 11 and the second fixed terminal 12 in the front-back direction.

[0044] The armature 17 is mounted on the movable piece 16. The armature 17 is arranged in front of the winding drum 22. The armature 17 is arranged between the movable support portion 34 of the movable piece 16 and the iron core 23. The armature 17 is arranged to face the head portion 29 of the iron core 23. The armature 17 is mounted on the movable support portion 34. The upper portion of the armature 17 contacts the horizontal portion 32 of the yoke 15.

[0045] Figure 5 It is a perspective view of the electromagnetic relay 1 with the case 6, the yoke 15, the movable piece 16, and the armature 17 omitted. Figure 6 FIG. 2 is an exploded perspective view of the winding drum 22 and the base 5. Figure 5 and Figure 6 As shown, the first flange 25 includes a first front surface 35, a second front surface 36, and a third front surface 37. The hole 24 opens at the first front surface 35. The hole 24 extends rearward from the first front surface 35. Figure 4 As shown, the first front surface 35 is disposed behind the head 29 so as to face the head 29. The first front surface 35 includes an annular portion 38 and an extending portion 39. The annular portion 38 has a substantially circular shape that matches the outer shape of the head 29. The extending portion 39 extends upward from the annular portion 38.

[0046] The second front surface 36 is arranged below the first front surface 35. The second front surface 36 extends in the left-right direction. The second front surface 36 is arranged at a position behind the first front surface 35. The third front surface 37 is arranged around the first front surface 35. The third front surface 37 is located at a position behind the first front surface 35. A first step portion 75 is provided between the third front surface 37 and the first front surface 35. The first step portion 75 protrudes forward from the third front surface 37. The second front surface 36 is located at a position behind the third front surface 37. A second step portion 76 is provided between the second front surface 36 and the third front surface 37. The second step portion 76 protrudes forward from the third front surface 37.

[0047] The winding drum 22 includes a first support portion 41 and a second support portion 42. The first support portion 41 is provided on the first flange 25. The first support portion 41 and the second support portion 42 are formed integrally with the first flange 25.

[0048] The first supporting portion 41 and the second supporting portion 42 support the first fixed terminal 11 .

[0049] The first support portion 41 protrudes forward from the first flange 25. The first support portion 41 protrudes forward from the third front surface 37. The first support portion 41 is arranged on the right side of the hole 24 of the winding drum 22. The first support portion 41 supports the first fixed terminal 11. The first support portion 41 is located at the same height as the central axis A1 of the coil 21. The upper end of the first support portion 41 is located above the central axis A1 of the coil 21. The first support portion 41 includes a first groove 43. The first groove 43 extends in the first support portion 41 in the up-down direction.

[0050] The second support portion 42 is arranged to be separated from the first support portion 41 in the left-right direction. The second support portion 42 is provided on the first flange 25. The second support portion 42 protrudes forward from the first flange 25. The second support portion 42 protrudes forward from the third front surface 37. The second support portion 42 is arranged to the left of the hole 24 of the winding drum 22. The second support portion 42 supports the first fixed terminal 11. The second support portion 42 is located at the same height as the central axis A1 of the coil 21. The upper end of the second support portion 42 is located above the central axis A1 of the coil 21. The second support portion 42 includes a second groove 44. The second groove 44 extends in the second support portion 42 in the up-down direction.

[0051] Figure 7 is a three-dimensional diagram of the first fixed terminal 11. Figure 7 As shown, the first fixed terminal 11 includes a first stopper 45, a second stopper 46, a first contact support portion 47 and a first external terminal portion 48. The first stopper 45 extends in the front-to-back direction and the up-down direction. The first stopper 45 is pressed into the first groove 43. Thus, the first fixed terminal 11 is mounted on the first support portion 41. The second stopper 46 extends in the front-to-back direction and the up-down direction. The second stopper 46 is pressed into the second groove 44. Thus, the first fixed terminal 11 is mounted on the second support portion 42.

[0052] The first contact support portion 47 extends in the left-right direction. The first contact support portion 47 connects the first stop portion 45 and the second stop portion 46. The first fixed contact 13 is provided in the first contact support portion 47. The first external terminal portion 48 extends downward from the first contact support portion 47. The first external terminal portion 48 protrudes from the base 5 to the outside of the electromagnetic relay 1.

[0053] Figure 8 yes Figure 4A magnified image of Figure 8 As shown, the first contact support portion 47 is arranged below the head portion 29. The first contact support portion 47 is arranged as a whole at a position behind the first front surface 35 of the first flange 25. The first contact support portion 47 is located as a whole at a position behind the head portion 29. In detail, the front surface 471 of the first contact support portion 47 is located at a position behind the first front surface 35. The front surface 471 of the first contact support portion 47 is located at a position behind the rear surface 291 of the head portion 29.

[0054] The first contact support portion 47 is disposed below the first step portion 75 and the second step portion 76 so as to face the first step portion 75 and the second step portion 76. The second front surface 36 is disposed behind the first contact support portion 47 so as to face the first contact support portion 47. The second front surface 36 is disposed to be spaced a predetermined distance D1 rearward from the first front surface 35. The predetermined distance D1 is greater than a thickness T1 of the first contact support portion 47 in the front-rear direction.

[0055] Fig. 9 1 is a perspective view of the electromagnetic relay 1 from below, omitting the housing 2, the yoke 15, the movable piece 16 and the armature 17. Fig. 9 As shown, the winding drum 22 includes a third supporting portion 51. The third supporting portion 51 is disposed on the central flange 27. The third supporting portion 51 supports the second fixed terminal 12. The third supporting portion 51 includes a third groove 52. The third groove 52 is disposed on the bottom surface of the central flange 27.

[0056] Fig.10 is a three-dimensional diagram of the second fixed terminal 12. Fig.10 As shown, the second fixed terminal 12 includes a third stopper 53, a second contact support portion 54, a connecting portion 55 and a second external terminal portion 56. The third stopper 53 extends in the up-down direction. The third stopper 53 is pressed into the third groove 52. Thus, the second fixed terminal 12 is mounted on the third support portion 51. The second contact support portion 54 extends in the left-right direction. The second fixed contact 14 is provided in the second contact support portion 54. The connecting portion 55 extends in the front-back direction. The connecting portion 55 connects the third stopper 53 with the second contact support portion 54. The second external terminal portion 56 extends downward from the second contact support portion 54. The second external terminal portion 56 protrudes from the base 5 to the outside of the electromagnetic relay 1.

[0057] Fig.11 1 is a cross-sectional top view of the electromagnetic relay 1. Fig. 9 and Fig.11As shown, the electromagnetic relay 1 includes a first coil terminal 61 and a second coil terminal 62. The first coil terminal 61 and the second coil terminal 62 are connected to the coil 21. The first coil terminal 61 and the second coil terminal 62 are mounted on the central flange 27. The first coil terminal 61 and the second coil terminal 62 are arranged between the first fixed terminal 11 and the common terminal 31.

[0058] The first coil terminal 61 includes a first main body portion 63 and a first winding portion 64. The first main body portion 63 is supported by the central flange 27. The first main body portion 63 extends downward from the central flange 27. The first main body portion 63 protrudes from the base 5 to the outside of the electromagnetic relay 1.

[0059] The first winding portion 64 is formed integrally with the first main body portion 63. The first winding portion 64 is bent relative to the first main body portion 63. The first winding portion 64 extends forward from the first main body portion 63 along the axial direction of the coil 21. The first winding portion 64 extends from the first main body portion 63 toward the first flange 25. The first winding portion 64 extends from the first main body portion 63 toward the first fixed terminal 11. The end of the coil 21 is wound around the first winding portion 64.

[0060] The second coil terminal 62 has the same shape as the first coil terminal 61. The second coil terminal 62 is arranged to be separated from the first coil terminal 61 in the left-right direction. The second coil terminal 62 includes a second main body 66 and a second winding portion 67. The second main body 66 and the second winding portion 67 have the same shape as the first main body 63 and the first winding portion 64, respectively.

[0061] like Fig. 9 As shown, the central flange 27 includes a fourth groove 65 and a fifth groove 68. The fourth groove 65 and the fifth groove 68 are arranged to be separated from the third groove to the left and right. The first body portion 63 is pressed into the fourth groove 65. Thus, the first coil terminal 61 is mounted on the central flange 27. The central flange 27 has a fifth groove 68. The second body portion 66 is pressed into the fifth groove 68. Thus, the second coil terminal 62 is mounted on the central flange 27.

[0062] like Figure 6 As shown, the first flange 25 includes a longitudinal wall portion 70, a first transverse wall portion 71, and a second transverse wall portion 72. The longitudinal wall portion 70 extends in the left-right direction. The longitudinal wall portion 70 extends upward from the base 5. The longitudinal wall portion 70 is arranged behind the first fixed terminal 11. The longitudinal wall portion 70 is arranged between the first fixed terminal 11 and the first winding portion 64. The longitudinal wall portion 70 is arranged between the first fixed terminal 11 and the second winding portion 67. The second front surface 36 is a surface on the front side of the longitudinal wall portion 70.

[0063] The first transverse wall portion 71 is bent relative to the longitudinal wall portion 70. The first transverse wall portion 71 protrudes forward from the second front surface 36. The first transverse wall portion 71 is arranged on the outer side of the first contact support portion 47 of the first fixed terminal 11. The first transverse wall portion 71 covers the first contact support portion 47 from the outer side. When viewed from the side, the first transverse wall portion 71 overlaps with the first contact support portion 47. The first transverse wall portion 71 is arranged on the outer side of the first fixed contact 13. The first transverse wall portion 71 covers the first fixed contact 13 from the outer side. When viewed from the side, the first transverse wall portion 71 overlaps with the first fixed contact 13. The first transverse wall portion 71 is arranged at a position that does not overlap with the second contact support portion 54 when viewed from the side. The first transverse wall portion 71 is arranged at a position that does not overlap with the second fixed contact 14 when viewed from the side. The first transverse wall portion 71 extends forward from the longitudinal wall portion 70.

[0064] like Figure 3 As shown, the first lateral wall portion 71 extends downward from the first support portion 41. The first lateral wall portion 71 is shorter than the first support portion 41 in the front-rear direction. That is, the first support portion 41 is longer than the first lateral wall portion 71 in the front-rear direction.

[0065] like Fig.11 As shown, the housing 6 includes a first side surface 73 and a second side surface 74. The first side surface 73 and the second side surface 74 are arranged to be separated from each other in the left-right direction. The first side surface 73 covers the first fixed terminal 11 and the second fixed terminal 12 from the right side. The second side surface 74 covers the first fixed terminal 11 and the second fixed terminal 12 from the left side. The first transverse wall portion 71 is arranged between the first fixed terminal 11 and the first side surface 73. In detail, the first transverse wall portion 71 is arranged between the first contact support portion 47 of the first fixed terminal 11 and the first side surface 73.

[0066] The second transverse wall portion 72 has the same shape as the first transverse wall portion 71. The second transverse wall portion 72 is disposed symmetrically with the first transverse wall portion 71. The insulation distance between the first coil terminal 61 and the first fixed terminal 11 is increased by the longitudinal wall portion 70 and the first transverse wall portion 71. Furthermore, the insulation distance between the second coil terminal 62 and the first fixed terminal 11 is ensured by the longitudinal wall portion 70 and the second transverse wall portion 72.

[0067] In the electromagnetic relay 1 of the present embodiment, the electromagnetic relay 1 is operated by energizing the coil 21 via the first coil terminal 61 and the second coil terminal 62. The operation of the electromagnetic relay 1 will be described below.

[0068] In the electromagnetic relay 1, when the coil 21 is not energized, Fig.12 As shown, the armature 17 is separated from the iron core 23 by the elastic force of the contact piece, and the movable contact 18 is urged toward the second fixed contact 14. As a result, the movable contact 18 is separated from the first fixed contact 13 and contacts the second fixed contact 14.

[0069] If the coil 21 is energized, the armature 17 is attracted to the core 23 by the magnetic force formed by the magnetic field generated by the coil 21. As a result, the armature 17 rotates around the support position P1 of the horizontal portion 32, as shown in FIG. Fig.13 As shown, the movable contact 18 contacts the head 29 at the contact position P2. The contact position P2 is located below the center axis A1. By the movement of the armature 17, the movable piece 16 is elastically deformed, and the movable support portion 34 moves toward the first fixed terminal 11. As a result, the movable contact 18 leaves the second fixed contact 14 and contacts the first fixed contact 13.

[0070] When the power supply to the coil 21 is cut off, the movable support portion 34 moves toward the second fixed contact 14 due to the elastic force of the movable piece 16. As a result, the armature 17 is separated from the iron core 23. As a result, Fig.12 As shown, the movable contact 18 moves away from the first fixed contact 13 and contacts the second fixed contact 14 .

[0071] In the electromagnetic relay 1 of the present embodiment described above, the second front surface 36 of the first flange 25 is larger than the thickness T1 of the first contact support portion 47 in the front-rear direction, and is separated from the first front surface 35 to the rear. With such a shape of the first flange 25, the first fixed terminal 11 can be compactly arranged, and the insulation distance between the iron core 23 and the first fixed terminal 11 can be increased in the front-rear direction. As a result, the electromagnetic relay 1 is prevented from being enlarged, and the insulation between the iron core 23 and the first fixed terminal 11 is improved.

[0072] As mentioned above, although one embodiment of the present invention has been described, the present invention is not limited to the above-mentioned embodiment, and various modifications can be made within the scope not departing from the gist of the invention.

[0073] The shapes of the first fixed terminal 11, the second fixed terminal 12, and the common terminal 31 are not limited to the above-mentioned embodiments and may be changed. The shape of the movable piece 16 is not limited to the above-mentioned embodiments and may be changed. The shapes of the base 5 and the housing 6 are not limited to the above-mentioned embodiments and may be changed. The second fixed contact 14 of the second fixed terminal 12 may also be omitted. In this case, the second external terminal portion 56 may also be omitted, and the second fixed terminal 12 may be used as a dummy terminal. The common terminal 31 may also be separated from the yoke 15 without being formed as one piece. The common terminal 31 may also be formed as one piece with the movable piece 16.

[0074] The shape of the winding drum 22 is not limited to the above-mentioned embodiment and may be changed. For example, the second fixed terminal 12 may be supported by the first flange 25. The shape of the first transverse wall portion 71 is not limited to the above-mentioned embodiment and may be changed. The shape of the second transverse wall portion 72 may be changed in the same manner as the first transverse wall portion 71.

[0075] Industrial Applicability

[0076] According to the present invention, the insulation between the core and the fixed terminal is improved while suppressing the increase in size of the electromagnetic relay.

Claims

1. An electromagnetic relay, characterized in that: have: Fixed contacts; A fixed terminal, comprising a contact support portion where the fixed contact is disposed; a coil disposed behind the fixed terminal and arranged in such a manner that a central axis thereof extends in a front-rear direction; an iron core including a shaft portion disposed in the coil and extending in a front-rear direction and a head portion connected to a front end of the shaft portion; and a bobbin on which the coil is wound, The reel comprises: a hole configured with the shaft portion; and The flange includes a first front surface having the hole and arranged behind the head so as to face the head, and a second front surface which is spaced a predetermined distance rearward from the first front surface and arranged behind the contact support portion so as to face the contact support portion. The predetermined distance is greater than a thickness of the contact support portion in a front-rear direction.

2. The electromagnetic relay according to claim 1, characterized in that: The contact support portion is entirely located rearward of the first front surface.

3. The electromagnetic relay according to claim 1, characterized in that: The contact support portion is entirely located rearward of the head portion.

4. The electromagnetic relay according to claim 1, characterized in that: The flange includes a third front surface disposed around the first front surface, The third front surface is located rearward of the first front surface.

5. The electromagnetic relay according to claim 4, characterized in that: The second front surface is located rearward of the third front surface.

6. The electromagnetic relay according to claim 4, characterized in that: The fixed terminal includes a locking portion, The flange includes a support portion for mounting the stop portion, The support portion protrudes forward from the third front surface.

7. The electromagnetic relay according to claim 1, characterized in that: Also available: A movable contact arranged opposite to the fixed contact; a movable piece provided with the movable contact; and an armature mounted on the movable piece, The contact support portion is arranged below the head portion, The armature is attracted to the core by the electromagnetic force generated by the coil, so that the armature comes into contact with the head at a position below the central axis.

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