Electromagnetic relay

Abstract

The invention provides an electromagnetic relay, which can restrain the enlargement of the electromagnetic relay and restrain the reduction of the insulating property between fixed terminals caused by wear powder accumulated in the electromagnetic relay. An electromagnetic relay includes a first fixed terminal, a second fixed terminal, a housing, a coil, and a spool. The second fixed terminal is disposed in front of the first fixed terminal so as to face the first fixed terminal. The housing includes a side surface covering the first fixed terminal and the second fixed terminal from a side. A coil is wound around the spool. The spool includes a support portion and a transverse wall portion. The support portion supports the first fixed terminal. The transverse wall portion extends from the support portion and is disposed between the first fixed terminal and the side surface of the housing in the left-right direction. The front end of the transverse wall portion is located between the first fixed terminal and the second fixed terminal in the front-back direction.

Description

Technical Field

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

[0002] Some electromagnetic relays have a pair of fixed terminals disposed so as to face each other, and a side surface of a housing is disposed to the side of the pair of fixed terminals (see, for example, Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

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

[0006] In an electromagnetic relay, wear powder or consumable powder (hereinafter referred to as wear powder, etc.) is generated by movable components such as contacts. When such wear powder is accumulated along the side of the housing on the side of the fixed terminal, the insulation between the fixed terminals is reduced due to the wear powder, etc. If the distance between the fixed terminal and the side of the housing is increased, the insulation between the fixed terminals is improved. 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 suppress a decrease in insulation between fixed terminals due to wear powder or the like accumulated inside the electromagnetic relay.

[0008] An electromagnetic relay of one embodiment of the present invention comprises a first fixed terminal, a second fixed terminal, a housing, a coil and a winding drum. The second fixed terminal is arranged in front of the first fixed terminal opposite to the first fixed terminal. The housing includes a side surface covering the first fixed terminal and the second fixed terminal from the side. The coil is wound on the winding drum. The winding drum includes a support portion and a transverse wall portion. The support portion supports the first fixed terminal. The transverse wall portion extends from the support portion and is arranged between the first fixed terminal and the side surface of the housing in the left-right direction. The front end of the transverse wall portion is located between the first fixed terminal and the second fixed terminal in the front-back direction.

[0009] In the electromagnetic relay of this embodiment, the creepage distance between the first fixed terminal and the second fixed terminal is lengthened by an amount corresponding to the thickness of the transverse wall portion, thereby suppressing the enlargement of the electromagnetic relay and suppressing the reduction of the insulation between the fixed terminals caused by the wear powder accumulated inside the electromagnetic relay.

[0010] The electromagnetic relay may also include a first fixed contact and a second fixed contact. The first fixed contact may also be provided at the first fixed terminal. The second fixed contact may also be provided at the second fixed terminal and arranged opposite to the first fixed terminal. The front end of the transverse wall portion may also be located between the first fixed contact and the second fixed contact in the front-to-back direction. In this case, the reduction in insulation between the fixed contacts can be suppressed.

[0011] The support portion may also be located at the same height as the central axis of the coil. In this case, the first fixed terminal is supported by the support portion at a position separated upward from the wear powder and the like accumulated inside the electromagnetic relay. Therefore, even if the portion supported by the support portion in the first fixed terminal is large, the reduction in insulation can be suppressed.

[0012] The transverse wall portion may also extend downward from the support portion. In this case, the transverse wall portion suppresses the reduction of insulation at a position lower than the support portion. The support portion may also be longer than the transverse wall in the front-to-back direction. In this case, the first fixed terminal is stably supported by the support portion.

[0013] A gap may also be provided between the side surface of the housing and the transverse wall portion. In this case, the surface distance between the first fixed terminal and the second fixed terminal is further expanded. Thus, the insulation between the fixed terminals is improved. The transverse wall portion may also include an opening. In this case, wear powder and the like can be released through the opening. Thus, the reduction in insulation between the fixed terminals can be suppressed.

[0014] The winding drum may also include a bent portion protruding from the lateral wall portion toward between the first fixed terminal and the second fixed terminal. In this case, the bent portion can suppress the scattering of wear powder and the like forward, thereby improving the insulation between the fixed terminals.

[0015] The electromagnetic relay may also include a coil terminal. The coil terminal may include a main body and a winding portion. The main body may be supported by a winding drum. The winding portion may extend from the main body toward the first fixed terminal. The winding drum may include a longitudinal wall portion. The longitudinal wall portion may be located between the first fixed terminal and the winding portion in the front-to-back direction. The transverse wall portion may extend forward from the longitudinal wall portion. In this case, the insulation distance between the first fixed terminal and the winding portion is lengthened by the longitudinal wall portion and the transverse wall portion. Thereby, the insulation between the first fixed terminal and the winding portion is improved.

[0016] According to the present invention, it is possible to suppress an increase in the size of the electromagnetic relay and to suppress a decrease in the insulation between the fixed terminals due to wear powder or the like accumulated inside 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 This is a three-dimensional view of an electromagnetic relay with the common terminal, movable piece, and armature omitted.

[0021] Figure 5 This is an exploded perspective view of the reel and base.

[0022] Figure 6 is a three-dimensional diagram of the first fixed terminal.

[0023] Figure 7 This is a perspective view of the electromagnetic relay viewed from below, with the common terminal, movable piece, and armature omitted.

[0024] Figure 8 is a perspective view of the second fixed terminal.

[0025] Fig. 9 It is a side view of an electromagnetic relay.

[0026] Fig.10 It is a cross-sectional top view of an electromagnetic relay.

[0027] Fig.11 yes Fig.10 Magnified image of .

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

[0029] Fig.13 It is a side view of the electromagnetic relay of the first modification.

[0030] Fig.14 It is a cross-sectional side view of an electromagnetic relay according to a second modification.

[0031] Fig.15 It is a perspective view of a base of an electromagnetic relay according to a second modification.

[0032] Fig.16 It is a cross-sectional plan view of an electromagnetic relay according to a third modified example.

[0033] Fig.17 It is a side view of the electromagnetic relay of the fourth modification.

[0034] Fig.18 It is a cross-sectional plan view of an electromagnetic relay according to a fifth modification.

[0035] Explanation of symbols

[0036] 2: housing; 11: first fixed terminal; 12: second fixed terminal; 13: first fixed contact; 14: second fixed contact; 21: coil; 22: winding drum; 25: first flange; 41: first supporting portion; 61: first coil terminal; 63: first main body portion; 64: first winding portion; 70: longitudinal wall portion; 71: first transverse wall portion; 83: opening; 84: bending portion; C1: gap. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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 when facing forward 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.

[0041] 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 3As 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 includes a hole 24. The hole 24 extends in the front-rear direction. The iron core 23 is arranged in the hole 24 of the winding drum 22. The iron core 23 is connected to the yoke 15.

[0042] The winding drum 22 is made of an insulating material such as resin. 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-to-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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] The armature 17 is attached to 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 attached to the movable support portion 34. The upper portion of the armature 17 contacts the horizontal portion 32 of the yoke 15.

[0049] Figure 4 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 5 FIG. 2 is an exploded perspective view of the winding drum 22 and the base 5. Figure 4 and Figure 5 As shown, the winding drum 22 includes a first supporting portion 41 and a second supporting portion 42. The first supporting portion 41 is disposed on the first flange 25. The first supporting portion 41 and the second supporting portion 42 are formed integrally with the first flange 25. The first supporting portion 41 and the second supporting portion 42 support the first fixed terminal 11.

[0050] The first support portion 41 protrudes forward from the first flange 25. 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.

[0051] 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 is arranged on the left side 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.

[0052] Figure 6 is a three-dimensional diagram of the first fixed terminal 11. Figure 6 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.

[0053] 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.

[0054] Figure 7 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. Figure 7 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.

[0055] Figure 8 is a three-dimensional diagram of the second fixed terminal 12. Figure 8As 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.

[0056] Fig. 9 is a side view of the electromagnetic relay 1. In addition, Fig. 9 , a portion of the spool 22 is shown in cross section. Fig.10 1 is a cross-sectional top view of the electromagnetic relay 1. Fig. 9 and Fig.10 As 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 installed 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. In addition, Fig. 9 The housing 6 is omitted.

[0057] like Fig. 9 As shown, 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.

[0058] 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.

[0059] 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.

[0060] like Fig.10As 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.

[0061] like Figure 5 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.

[0062] The first transverse wall portion 71 is bent relative to the longitudinal wall portion 70. 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.

[0063] The first lateral wall portion 71 extends forward from the vertical wall portion 70 . Fig. 9 In FIG. 7 , the double-dotted line shows the position of the front end 710 of the first transverse wall portion 71. Fig. 9 and Fig.10 As shown, the first transverse wall portion 71 extends forward from the longitudinal wall portion 70 to a position beyond the first fixed terminal 11. The front end 710 of the first transverse wall portion 71 is located between the first fixed terminal 11 and the second fixed terminal 12. The front end 710 of the first transverse wall portion 71 is located between the first fixed contact 13 and the second fixed contact 14. The position between the first fixed contact 13 and the second fixed contact 14 is the position from the position aligned with the contact surface of the first fixed contact 13 to the position aligned with the contact surface of the second fixed contact 14 when viewed from the side. In the present embodiment, the front end 710 of the first transverse wall portion 71 is located at a position aligned with the contact surface of the first fixed contact 13 when viewed from the side.

[0064] like Figure 3As 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.10 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] Fig.11 yes Fig.10 A magnified image of Fig.11 As shown, a gap C1 is provided between the first side surface 73 of the housing 6 and the first transverse wall portion 71. Figure 2 As shown in FIG. 1 , protrusions 75 to 77 are provided on the side of the base 5. Fig.11 As shown, the projections 75 to 77 are in contact with the first side surface 73 , so that a gap C1 is provided between the first side surface 73 and the first lateral wall portion 71 .

[0067] The second lateral wall portion 72 has the same shape as the first lateral wall portion 71. The second lateral wall portion 72 is disposed symmetrically with the first lateral wall portion 71. Although not shown in the figure, a gap is provided between the second lateral wall portion 74 and the second lateral wall portion 72, similarly to the first lateral wall portion 73 and the first lateral wall portion 71.

[0068] The vertical wall 70 and the first lateral wall 71 increase the insulation distance between the first coil terminal 61 and the first fixed terminal 11 . The vertical wall 70 and the second lateral wall 72 ensure the insulation distance between the second coil terminal 62 and the first fixed terminal 11 .

[0069] 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.

[0070] In the electromagnetic relay 1, when the coil 21 is not energized, Fig. 9 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.

[0071] When the coil 21 is energized, the armature 17 is attracted to the core 23 by the magnetic force generated by the magnetic field generated by the coil 21. As a result, the movable piece 16 is elastically deformed, and the movable support portion 34 moves toward the first fixed terminal 11. As a result, Fig.12 As shown, the movable contact 18 moves away from the second fixed contact 14 and contacts the first fixed contact 13 .

[0072] 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. 9 As shown, the movable contact 18 moves away from the first fixed contact 13 and contacts the second fixed contact 14 .

[0073] For the electromagnetic relay 1 of the present embodiment described above, Fig. 9 As shown, in the first coil terminal 61, the first winding portion 64 extends forward from the first main body portion 63 along the coil 21. Therefore, the first coil terminal 61 is compactly arranged together with the coil 21. In addition, the longitudinal wall portion 70 of the first flange 25 is located between the first fixed terminal 11 and the first winding portion 64. Therefore, the insulation distance between the first fixed terminal 11 and the first winding portion 64 is lengthened. In addition, the first transverse wall portion 71 extends forward from the longitudinal wall portion 70. Therefore, the insulation distance between the first fixed terminal 11 and the first winding portion 64 is further lengthened. Thus, the insulation between the first fixed terminal 11 and the first coil terminal 61 is improved. Similarly, through the second transverse wall portion 72, the insulation distance between the first fixed terminal 11 and the second winding portion 67 is lengthened. Thus, the insulation between the first fixed terminal 11 and the second coil terminal 62 is improved.

[0074] like Fig.11 As shown, in the electromagnetic relay 1, the creepage distance between the first fixed terminal 11 and the second fixed terminal 12 is lengthened by an amount corresponding to the thickness T1 of the first transverse wall portion 71. Thus, the electromagnetic relay 1 is prevented from being enlarged, and the insulation between the first fixed terminal 11 and the second fixed terminal 12 is improved. Furthermore, the creepage distance between the first fixed terminal 11 and the second fixed terminal 12 is lengthened by an amount corresponding to the gap C1 between the first transverse wall portion 71 and the first side surface 73. Thus, the insulation between the first fixed terminal 11 and the second fixed terminal 12 is improved.

[0075] 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.

[0076] 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 shape of the winding drum 22 is not limited to the above-mentioned embodiments and may be changed. For example, the second fixed terminal 12 may be supported by the first flange 25. The second fixed contact 14 of the second fixed terminal 12 may be omitted. In this case, the second external terminal portion 56 may be omitted and the second fixed terminal 12 may be used as a dummy terminal. The common terminal 31 may be separated from the yoke 15 without being formed as one piece. The common terminal 31 may be formed as one piece with the movable piece 16.

[0077] The shape of the first transverse wall portion 71 is not limited to the above-mentioned embodiment, and may also be changed. Fig.13 FIG. 1 is a side view of the electromagnetic relay 1 of the first variant. Fig.13 As shown, the first transverse wall portion 71 extends to a position aligned with the contact surface of the second fixed contact 14. Alternatively, the first transverse wall portion 71 may extend between a position aligned with the contact surface of the first fixed contact 13 and a position aligned with the contact surface of the second fixed contact 14. The shape of the second transverse wall portion 72 may also be changed in the same manner as the first transverse wall portion 71.

[0078] The shapes of the base 5 and the housing 6 are not limited to the above-mentioned embodiments, and may be changed. For example, the first side surface 73 may be provided on the base 5 instead of on the housing 6. That is, the first transverse wall portion 71 may be arranged between the first fixed terminal 11 and the side surface of the base 5 in the left-right direction. The second side surface 74 may be provided on the base 5 in the same manner as the first side surface 73. The protrusions 75 to 77 may be provided on the housing 6 or the winding drum 22 instead of on the base 5.

[0079] Fig.14 It is a cross-sectional side view of an electromagnetic relay 1 according to a second modification. Fig.15 FIG. 5 is a perspective view of the base 5 of the electromagnetic relay 1 according to the second modified example. Fig.14 and Fig.15 As shown, the base 5 includes a first base wall portion 78. The first base wall portion 78 may also be arranged between the first fixed terminal 11 and the first winding portion 64. As a result, the insulation distance between the first coil terminal 61 and the first fixed terminal 11 is further extended. The base 5 may also include a second base wall portion 79. The second base wall portion 79 may also be arranged between the first fixed terminal 11 and the second winding portion 67. As a result, the insulation distance between the second coil terminal 62 and the first fixed terminal 11 is further extended.

[0080] Fig.16 FIG. 1 is a cross-sectional top view of the electromagnetic relay 1 of the third variant. Fig.16As shown, the housing 6 includes a first housing wall portion 81. The first housing wall portion 81 may also be disposed between the first fixed terminal 11 and the first winding portion 64. Thus, the insulation distance between the first coil terminal 61 and the first fixed terminal 11 is further extended. The housing 6 may also include a second housing wall portion 82. The second housing wall portion 82 may also be disposed between the first fixed terminal 11 and the second winding portion 67. Thus, the insulation distance between the second coil terminal 62 and the first fixed terminal 11 is further extended.

[0081] Fig.17 FIG. 1 is a side view of the electromagnetic relay 1 of the fourth modified example. Fig.17 As shown, the first lateral wall portion 71 includes an opening 83. In this case, wear powder and the like can be released through the opening 83. Thus, a decrease in insulation between the first fixed terminal 11 and the second fixed terminal 12 due to wear powder and the like can be suppressed.

[0082] Fig.18 FIG. 1 is a side view of the electromagnetic relay 1 of the fifth modification. Fig.18 As shown, the winding drum 22 includes a bent portion 84. The bent portion 84 may protrude from the first transverse wall portion 71 toward between the first fixed terminal 11 and the second fixed terminal 12. In this case, the bent portion 84 can be used to suppress the scattering of wear powder and the like forward. Thus, the reduction in insulation between the first fixed terminal 11 and the second fixed terminal 12 caused by the wear powder and the like can be suppressed.

[0083] Industrial Applicability

[0084] According to the present invention, it is possible to suppress an increase in the size of the electromagnetic relay and to suppress a decrease in the insulation between the fixed terminals due to wear powder or the like accumulated inside the electromagnetic relay.

Claims

1. An electromagnetic relay, characterized in that: have: a first fixed terminal; a second fixed terminal, arranged in front of the first fixed terminal and opposite to the first fixed terminal; a housing including a side surface covering the first fixed terminal and the second fixed terminal from the side; Coil; as well as a winding drum including a support portion supporting the first fixed terminal and a transverse wall portion extending from the support portion and arranged between the first fixed terminal and a side surface of the housing in the left-right direction, the coil being wound around the winding drum, The front end of the lateral wall portion is located between the first fixed terminal and the second fixed terminal in the front-rear direction.

2. The electromagnetic relay according to claim 1, characterized in that: Also available: A first fixed contact, which is arranged at the first fixed terminal; and a second fixed contact provided on the second fixed terminal and arranged opposite to the first fixed terminal; The front end of the lateral wall portion is located between the first fixed contact and the second fixed contact in the front-rear direction.

3. The electromagnetic relay according to claim 1, characterized in that: The lateral wall portion extends downward from the support portion.

4. The electromagnetic relay according to claim 1, characterized in that: The support portion is longer than the transverse wall in the front-rear direction.

5. The electromagnetic relay according to claim 1, characterized in that: A gap is provided between the side surface of the housing and the transverse wall portion.

6. The electromagnetic relay according to claim 1, characterized in that: The transverse wall portion includes an opening.

7. The electromagnetic relay according to claim 1, characterized in that: The winding drum includes a bent portion protruding from the lateral wall portion toward between the first fixed terminal and the second fixed terminal.

8. The electromagnetic relay according to claim 1, characterized in that: A coil terminal is further provided, the coil terminal including a main body portion supported by the winding drum and a winding portion extending from the main body portion toward the first fixed terminal, The winding drum includes a longitudinal wall portion located between the first fixed terminal and the winding portion in the front-rear direction. The transverse wall portion extends forward from the vertical wall portion.

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