ELECTROMAGNETIC RELAY

Abstract

The electromagnetic relay includes a fixed terminal, a fixed contact, a movable contact, a movable piece, a coil, a coil terminal, and a solder joint. The fixed contact is connected to the fixed terminal. The movable contact is arranged to face the fixed contact. The movable contact is connected to the movable piece. The movable piece is movable between a closed position and an open position. In the closed position, the movable contact touches the fixed contact. In the open position, the movable contact is separated from the fixed contact. The coil generates an electromagnetic force to move the movable piece. The coil encloses a conductor wire. The coil terminal encloses a tied section. The conductor wire is wound around the tied section. The tied section encloses a recessed shape.The solder is applied to the connected section in the recessed shape, thereby securing the conductor wire to the connected section.

Description

TECHNICAL AREA This invention relates to an electromagnetic relay. STATE OF THE ART The electromagnetic relay includes a coil and coil terminals for supplying power to the coil. For example, in the electromagnetic relay of patent document 1, the coil's conductor wires are wound around a connected section of the coil terminals and secured to the connected section by soldering. QUOTE LIST Patent literature [Patent Document 1] JP 2010-10055 A SUMMARY Technical tasks As described above, when the coil's lead wire is soldered to the coil terminals, depending on the shape of the terminals, heat cannot be easily transferred to the terminals, resulting in inadequate soldering. Making the coil terminals thinner improves heat transfer, but reduces the strength of the terminals when wound with the lead wires. An object of the present invention is to improve the quality of the solder joint at the coil terminals while maintaining the strength of the terminals. Problem solving An electromagnetic relay according to one aspect of the present invention includes a fixed terminal, a fixed contact, a movable contact, a movable part, a coil, a coil terminal, and a solder. The fixed contact is connected to the fixed terminal. The movable contact is arranged to face the fixed contact. The movable contact is connected to the movable part. The movable part is movable between a closed position and an open position. When the movable part is in the closed position, the movable contact touches the fixed contact. When the movable part is in the open position, the movable contact is separated from the fixed contact. The coil generates an electromagnetic force to move the movable part between the open position and the closed position. The coil includes a conductor wire.The coil terminal includes a tied section. The tied section is wound around the conductor wire. The tied section forms a recessed area. Solder is applied to the tied section within this recessed area, thereby securing the conductor wire to the tied section. In the electromagnetic relay as described above, the connected section incorporates a recessed form, thus reducing its volume while maintaining its plate thickness. This facilitates heat transfer to the connected section, improving the soldering quality of the coil's lead wire. Since the plate thickness of the connected section is maintained, its strength is also preserved. The connected section can have a plate-like shape. The recessed form is a depression extending from the surface of the connected section in the plate thickness direction. In this case, the recessed form can extend over a wide area of ​​the connected section. The connected section can have a plate-like shape. The connected section can have an end surface that extends in the plate thickness direction. The recessed form can be displaced on the end surface. The recessed form can include a multitude of depressions. In this case, the strength of the connected section is improved compared to providing a single large depression. The recessed shape can be polygonal. The recessed shape can be circular. The recessed shape can be grooved. The recessed shape can penetrate the connected section. These recessed shapes improve heat transfer in the connected section and maintain the strength of the connected section. Advantageous effects of the invention According to the present invention, the quality of the soldering of the coil's conductor wire to the connected section is improved, while maintaining the strength of the connected section of the coil terminal. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a perspective view of an electromagnetic relay according to one embodiment. Fig. 2 shows a cross-sectional view of the electromagnetic relay. Fig. 3 shows a cross-sectional view of the electromagnetic relay. Fig. 4 shows a front view of the electromagnetic relay, with the cover omitted. Fig. 5 shows a cross-sectional view along line VV from Fig. 4. Fig. 6 shows a perspective view of a first coil terminal. Fig. 7 shows an enlarged perspective view of the first coil terminal. Fig. 8 shows an enlarged front view of the first coil terminal. Fig. 9 shows a cross-sectional view along line IX-IX from Fig. 8. Fig. 10 shows an enlarged front view of the first coil terminal, showing a first connected section around which a first conductor wire is wound and secured by soldering.Figure 11 shows an enlarged front view of the first coil terminal according to a first modified example. Figure 12 shows an enlarged front view of the first coil terminal according to a second modified example. Figure 13 shows an enlarged front view of the first coil terminal according to a third modified example. Figure 14 shows an enlarged front view of the first coil terminal according to the fourth modified example. Figure 15 shows a cross-sectional view of the first coil terminal according to a fifth modified example. DETAILED DESCRIPTION An electromagnetic relay according to one embodiment of this invention is described below with reference to the drawings. Fig. 1 shows a perspective view of an electromagnetic relay 1 according to one embodiment. Figs. 2 and 3 show cross-sectional views of the electromagnetic relay 1. As shown in Figs. 1, 2 to 3, the electromagnetic relay 1 includes a receptacle 2, a contact device 3, and a drive device 4. The receptacle 2 includes a housing 2A and a cover 2B. The cover 2B is attached to the housing 2A. The receptacle 2 houses the contact device 3 and the drive device 4. The contact device 3 includes a first fixed terminal 6, a second fixed terminal 7, a movable part 8, a movable mechanism 9, a first fixed contact 10, a second fixed contact 11, a first movable contact 12, and a second movable contact 13. In the following description, the direction in which the first fixed contact 10 and the first movable contact 12 are arranged facing each other is defined as the up-down direction. The direction perpendicular to the up-down direction is defined as the lateral direction. The lateral direction includes the left-right direction and the forward-backward direction. The longitudinal direction of the movable piece 8 is defined as the left-right direction. The direction perpendicular to the up-down direction and the left-right direction is defined as the forward-backward direction. The direction from the movable contacts 12 and 13 toward the fixed contacts 10 and 11 is defined as the contact direction (Z1). The direction from the fixed contacts 10 and 11 toward the movable contacts 12 and 13 is defined as the opening direction (Z2). The first fixed terminal 6, the second fixed terminal 7, the movable piece 8, the first fixed contact 10, the second fixed contact 11, the first movable contact 12, and the second movable contact 13 are made of a conductive material. For example, the first fixed terminal 6, the second fixed terminal 7, and the movable piece 8 are made of a material known as a terminal material, such as a copper-based metal. However, the first fixed terminal 6, the second fixed terminal 7, and the movable piece 8 can be made of different materials. The first fixed contact 10, the second fixed contact 11, the first movable contact 12, and the second movable contact 13 are made of a material known as a contact material, such as a copper-based metal or a silver-based metal. The first fixed terminal 6 and the second fixed terminal 7 are spaced apart in the left-right direction. Both the first fixed terminal 6 and the second fixed terminal 7 are plate-shaped. The first fixed terminal 6 and the second fixed terminal 7 protrude from the inside of the receptacle 2 to the outside of the receptacle 2. The first fixed contact 10 is connected to the first fixed terminal 6. The second fixed contact 11 is connected to the second fixed terminal 7. The first fixed contact 10 and the second fixed contact 11 are located in the receptacle 2. The movable piece 8, the first movable contact 12, and the second movable contact 13 are arranged within the receptacle 2. The first movable contact 12 and the second movable contact 13 are connected to the movable piece 8. The first movable contact 12 faces the first fixed contact 10. The second movable contact 13 faces the second fixed contact 11. The first movable contact 12 is spaced from the second movable contact 13 in the left-right direction. The movable piece 8 is movable in the up-down direction. The movable piece 8 is movable between an open position, shown in Fig. 2, and a closed position, shown in Fig. 3. According to the illustration in Fig. 2, the movable contacts 12 and 13 are separated from the fixed contacts 10 and 11 when the movable piece 8 is in the open position. According to the illustration in Fig. 3, the movable contacts 12 and 13 are in contact with the fixed contacts 10 and 11 when the movable piece 8 is in the closed position. The movable mechanism 9 carries the movable piece 8. The movable mechanism 9 includes a drive shaft 21 and a contact spring 22. The drive shaft 21 is connected to the movable piece 8. The drive shaft 21 extends in the upward-downward direction and passes through the movable piece 8 in the upward-downward direction. The drive shaft 21 is designed to be movable in the upward-downward direction. The contact spring 22 biases the movable piece 8 in the contact direction (Z1). As shown in Figures 2 and 3, the drive device 4 moves the drive shaft 21 in the up-down direction. The drive device 4 includes a coil 23, a roller 24, a movable iron core 25, a fixed iron core 26, a yoke 27, and a return spring 28. The drive device 4 moves the movable part 8 between the open and closed positions via the movable mechanism 9 by electromagnetic force. The coil 23 is wound around the roller 24. The movable iron core 25 and the fixed iron core 26 are arranged inside the roller 24. The movable iron core 25 is connected to the drive shaft 21. The movable iron core 25 is movable in the up-down direction. The fixed iron core 26 is arranged to face the movable iron core 25. The return spring 28 biases the movable iron core 25 in the opening direction (Z2). In the electromagnetic relay 1, the movable iron core 25 is attracted to the fixed iron core 26 by the magnetic force of the coil 23 when the coil 23 is energized. Consequently, the movable iron core 25 and the drive shaft 21 move in the contact direction (Z1) against the preload force of the return spring 28. As a result, the movable part 8 moves to the closed position shown in Fig. 3, and the movable contacts 12 and 13 come into contact with the fixed contacts 10 and 11. After the movable contacts 12 and 13 have come into contact with the fixed contacts 10 and 11, the drive shaft 21 continues to move in the contact direction (Z1), thereby compressing the contact spring 22. When the current to the coil 23 is switched off, the movable iron core 25 and the drive shaft 21 move in the opening direction (Z2) due to the preload force of the return spring 28. Consequently, the movable piece 8 moves into the open position shown in Fig. 2, and the movable contacts 12 and 13 move away from the fixed contacts 10 and 11. Fig. 4 is a front view of the electromagnetic relay 1, with the cover 2B omitted. Fig. 5 shows a cross-sectional view along line VV from Fig. 4. As shown in Figs. 4 and 5, the electromagnetic relay 1 includes a connector receptacle 30, a first coil terminal 31, and a second coil terminal 32. The connector receptacle 30 is attached to the outer surface of the housing 2A. The first coil terminal 31 and the second coil terminal 32 are made of a conductive material. For example, the first coil terminal 31 and the second coil terminal 32 are made of a material known as a terminal material, such as a copper-based metal. However, the first coil terminal 31 and the second coil terminal 32 can be made of a different material. A section of the first coil terminal 31 and a section of the second coil terminal 32 are arranged within the connector receptacle 30. The first coil terminal 31 and the second coil terminal 32 are connected to the coil 23. A current is passed through the coil 23 via the first coil terminal 31 and the second coil terminal 32. In detail, the coil 23 encloses a coil body 33, a first conductor wire 34, and a second conductor wire 35. The coil body 33 is wound around the reel 24. The first conductor wire 34 extends from the coil body 33 towards the first coil terminal 31. The first conductor wire 34 is connected to the first coil terminal 31. The second conductor wire 35 extends from the coil body 33 towards the second coil terminal 32. The second conductor wire 35 is connected to the second coil terminal 32. The roller 24 includes a cylindrical section 36, a first flanged section 37, a second flanged section 38, and a connecting support section 39. The coil former 33 is wound around the cylindrical section 36. The first flanged section 37 and the second flanged section 38 project from the cylindrical section 36 in the outer diameter direction of the roller 24. The cylindrical section 36 is located between the first flanged section 37 and the second flanged section 38. The connecting support section 39 is connected to the first flanged section 37. The connecting support section 39 carries the first coil connection 31 and the second coil connection 32. Fig. 6 is a perspective view of the first coil terminal 31. As shown in Fig. 6, the first coil terminal 31 includes a first terminal body 41, a first connecting section 42, and a first connected section 43. The first terminal body 41 projects from the inside of the receptacle 2 to the outside of the receptacle 2. A section of the first terminal body 41 is located within the connector receptacle 30. The first connecting section 42 is connected to the first terminal body 41 and the first connected section 43. The first connecting section 42 connects the first terminal body 41 and the first connected section 43 to each other. The first coil terminal 31 has a curved shape between the first terminal body 41 and the first connecting section 42. The first conductor wire 34 is wound around the first connected section 43. The first coil terminal 31 has the curved shape between the first connecting section 42 and the first connected section 43. The first connected section 43 has a plate shape. Fig. 7 shows an enlarged perspective view of the first coil terminal 31. Fig. 8 shows an enlarged front view of the first coil terminal 31. Fig. 9 shows a cross-sectional view along line IX-IX from Fig. 8. As shown in Figures 7, 8 to 9, the first connected section 43 includes a first surface 44 and a second surface 45. The first surface 44 and the second surface 45 are surfaces perpendicular to the plate thickness direction T1 of the first connected section 43. The first surface 44 is arranged to face the first connecting body 41. The second surface 45 is located on the side opposite the first surface 44 in the plate thickness direction T1. The first connected section 43 includes an upper end surface 46, a lower end surface 47, and a tip end surface 48. The upper end surface 46, the lower end surface 47, and the tip end surface 48 extend in the plate thickness direction T1. The first connected section 43 includes a first locking section 46A and a second locking section 47A. The first locking section 46A is recessed downwards from the upper end surface 46. The second locking section 47A is recessed upwards from the lower end surface 47. The first conductor wire 34, which is wound around the first connected section 43, is locked to the first locking section 46A and the second locking section 47A. The first connected section 43 includes recessed features 49. The recessed features 49 include a plurality of depressions 49A. In the drawings, only some of the depressions 49A are designated with reference numerals 49A, and the reference numerals of the other depressions 49A are omitted. The plurality of depressions 49A are provided in the second surface 45. The plurality of depressions 49A are provided on the second surface 45 in the area between the first locking section 46A and the tip end surface 48. The plurality of depressions 49A are recessed from the second surface 45 in the plate thickness direction T1 of the connected section. Fig. 10 shows an enlarged front view of the first coil terminal 31, showing the first connected section 43 around which the first conductor wire 34 is wound and secured by solder 50. As shown in Fig. 10, the solder 50 is applied to the first connected section 43 in the recessed forms 49, thereby securing the first conductor wire 34 to the first connected section 43. More precisely, the first conductor wire 34 is wound around the first connected section 43 in the area between the first locking section 46A and the second locking section 47A. The solder 50 is applied to the first connected section 43 at least in the area where the plurality of recesses 49A are provided in the first connected section 43.Therefore, the solder 50 is applied to the first connected section 43 to cover at least one section of the plurality of recesses 49A and at least one section of the first conductor wire 34. As shown in Fig. 5, the second coil terminal 32 has a shape that is symmetrical to the first coil terminal 31. The second coil terminal 32 includes a second terminal body 51, a second connecting section 52, and a second connected section 53. The second terminal body 51, the second connecting section 52, and the second connected section 53 each have the same shapes as the first terminal body 41, the first connecting section 42, and the first connected section 43, so detailed explanations are omitted. In the electromagnetic relay 1 according to the present embodiment described above, the first connected section 43 incorporates the recessed forms 49, which reduce the volume of the first connected section 43 while maintaining its thickness. Therefore, heat is more easily transferred to the first connected section 43, and the quality of the solder 50 applied to the first conductor wire 34 of the coil 23 on the first connected section 43 is improved. Since the thickness of the first connected section 43 is maintained, its strength is also preserved. The second coil terminal 32 has the same shape as the first coil terminal 31 and provides the same functionality. Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiments described above, and various variants are possible without deviating from the concept of the invention. The design of the electromagnetic relay 1 is not limited to that of the embodiment described above and can be modified. For example, the electromagnetic relay 1 is not limited to a so-called piston-type electromagnetic relay as in the embodiment described above, but can be another type of electromagnetic relay, such as a hinge-type relay. The first fixed contact 10 can be a separate body from the first fixed terminal 6 or can be integral with it. The second fixed contact 11 can be a separate body from the second fixed terminal 7 or can be integral with it. The first movable contact 12 and the second movable contact 13 can be separate bodies from the movable piece 8 or can be integral with it. The connector receptacle 30 can be omitted. The shapes of the first coil terminal 31 and the second coil terminal 32 can be modified. For example, the first coil terminal 31 and the second coil terminal 32 are not limited to having a curved shape and can have a linear shape. The recessed shapes 49 of the first coil terminal 31 and the second coil terminal 32 are not limited to those in the embodiment above and can be modified. For example, the shape of the recesses 49A is not limited to a square as in the embodiment above and can have other shapes. The recesses 49A can have a different polygonal shape, such as a triangle, pentagon, or hexagon. Fig. 11 shows an enlarged front view of the first coil terminal 31 according to a first modified example. As shown in Fig. 11, the recessed shapes 49 can enclose a circular recess 49B. The recessed forms 49 can have a groove shape. Fig. 12 shows an enlarged front view of a first coil terminal 31 according to a second modified example. As shown in Fig. 12, the recessed forms 49 can include a plurality of groove recesses 49C extending parallel to one another. Fig. 13 shows an enlarged front view of the first coil terminal 31 according to a third modified example. As shown in Fig. 13, the recessed forms 49 can be formed by a recess 49D. The recessed features 49 are not limited to being provided on the second surface 45 and may be provided on other sections of the first attached section 43. For example, the recessed features 49 may be provided on any of the surfaces between the first surface 44, the upper end surface 46, the lower end surface 47, and the tip end surface 48. The recessed features 49 may be provided on more than one of the surfaces between the first surface 44, the upper end surface 46, the lower end surface 47, and the tip end surface 48. Fig. 14 shows a front view of the first coil terminal 31 according to a fourth modified example. As shown in Fig. 14, recesses 49E may be provided on the upper end surface 46. Recesses 49F may be provided on the lower end surface 47. Recesses 49G may be provided on the tip end surface 48. Alternatively, two or more of the recesses 49A-49G of the recessed forms 49 may be provided in combination in the first connected section 43. The recessed forms 49 are not limited to the bottom-side recesses 49A as in the embodiment above. For example, Fig. 15 shows a cross-sectional view of the first coil terminal 31 according to a fifth modified example. As shown in Fig. 15, the recessed forms 49 can penetrate the first connected section 43. The second coil terminal 32 can also have the same shape as the first coil terminal 31 according to the modified example described above. INDUSTRIAL APPLICATION According to the present invention, the quality of the soldering of the coil's conductor wire to the connected section is improved, while maintaining the strength of the connected section of the coil terminal. REFERENCE MARK LIST 6 First fixed connection, 8 Movable piece, 10 Fixed contact, 12 First movable contact, 23 Coil, 31 First coil connection, 34 First conductor wire, 43 First connected section, 46 Upper end surface, 47 Lower end surface, 48 Tip end surface, 49A Recess, 50 Solder QUOTES INCLUDED IN THE DESCRIPTION This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature JP 2010-10055 A

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Claims

Electromagnetic relay comprising: a fixed terminal; a fixed contact connected to the fixed terminal; a movable contact arranged to face the fixed contact; a movable piece connected to the movable contact, wherein the movable piece is movable between a closed position in which the movable contact touches the fixed contact and an open position in which the movable contact is separated from the fixed contact; a coil enclosing a conductor wire, wherein the coil generates an electromagnetic force to move the movable piece between the open position and the closed position; a coil terminal enclosing a tied section wound by the conductor wire, the coil terminal enclosing the tied section which includes a recessed shape;and a solder applied to the attached section in the recessed form, the solder securing the conductor wire to the attached section. Electromagnetic relay according to claim 1, wherein the connected section has a plate shape, and the recessed shape is recessed from a surface of the connected section in a plate thickness direction. Electromagnetic relay according to claim 1, wherein the connected section has a plate shape, the connected section has an end surface extending in a plate thickness direction, and the recessed shape is arranged on the end surface. Electromagnetic relay according to claim 1, wherein the recessed shape includes a plurality of recesses. Electromagnetic relay according to claim 1, wherein the recessed shape has a polygonal shape. Electromagnetic relay according to claim 1, wherein the recessed shape has a circular shape. Electromagnetic relay according to claim 1, wherein the recessed shape has a groove shape. Electromagnetic relay according to claim 1, wherein the recessed shape penetrates the connected section.

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