Electromagnetic relay

Abstract

The electromagnetic relay includes a pair of fixed terminals, a movable contact piece and a magnet portion. The pair of fixed terminals includes a fixed contact. The movable contact piece includes a movable contact arranged opposite to the fixed contact, and can move in a first direction in which the movable contact contacts the fixed contact and in a second direction in which the movable contact moves away from the fixed contact. The magnet portion generates a magnetic field for extending an arc generated between the fixed contact and the movable contact. At least one of a corner portion on a first direction side of the fixed terminal in the arc extension direction or a corner portion on a second direction side of the movable contact piece in the arc extension direction has a chamfered shape within a range where the arc passes.

Description

Technical Field

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

[0002] In the past, electromagnetic relays that open and close circuits were known. For example, the electromagnetic relay disclosed in Patent Document 1 includes a fixed terminal containing a fixed contact and a movable contact piece containing a movable contact. The movable contact can contact the fixed contact, and the circuit is opened and closed by the movable contact contacting or separating from the fixed contact. In addition, the electromagnetic relay is provided with a permanent magnet for extending the arc generated when the movable contact separates from the fixed contact (see Patent Document 1). The fixed terminal has a chamfered portion at the end opposite the movable contact piece, thereby allowing the arc to move smoothly away from the fixed contact, thereby extending the arc.

[0003] Patent Document 1: Japanese Patent No. 6281301

[0004] In Patent Document 1, the end of the fixed terminal opposite the movable contact piece is shaped like an edge, causing the arc to stagnate at this end. Consequently, it is difficult for the arc to move smoothly along the surface of the fixed terminal opposite the movable contact piece. In other words, the smooth movement of the arc is hindered, making it difficult for the arc to extend smoothly. Similarly, in Patent Document 1, since the end of the movable contact piece opposite the fixed terminal is shaped like an edge, it is difficult for the arc to move smoothly along the surface of the movable contact piece opposite the fixed terminal. Summary of the Invention

[0005] An object of the present invention is to smoothly extend an arc in an electromagnetic relay.

[0006] An electromagnetic relay according to one embodiment of the present invention includes a pair of fixed terminals, a movable contact piece, and a magnet portion. The pair of fixed terminals includes a fixed contact. The movable contact piece includes a movable contact arranged opposite the fixed contact. The movable contact piece is movable in a first direction in which the movable contact contacts the fixed contact and in a second direction in which the movable contact moves away from the fixed contact. The magnet portion generates a magnetic field for extending an arc generated between the fixed contact and the movable contact. At least one of a corner portion of the fixed terminal located on a first direction side in the arc extension direction or a corner portion of the movable contact piece located on a second direction side in the arc extension direction has a chamfered shape within a range through which the arc passes.

[0007] In this electromagnetic relay, within the range through which the end of the arc passes, at least one of the corners of the fixed terminal on the first side in the arc extension direction or the corners of the movable contact piece on the second side in the arc extension direction is chamfered. Therefore, when the corners of the fixed terminal on the first side in the arc extension direction are chamfered, the end of the arc can smoothly move to the surface of the fixed terminal on the first side when the arc is extended by the magnet portion. Furthermore, when the corners of the movable contact piece on the second side in the arc extension direction are chamfered, the end of the arc can smoothly move to the surface of the movable contact piece on the second side when the arc is extended by the magnet portion. As a result, the arc can be extended smoothly.

[0008] Preferably, at least one of the corners of the fixed terminal on the second side of the arc extension direction or the corners of the movable contact piece on the first side of the arc extension direction has a chamfered shape within the arc's path. In this case, when the arc is extended by the magnet, the arc's end can smoothly move to the surface of the fixed terminal on the first side or the surface of the movable contact piece on the second side. As a result, the arc can be extended more smoothly.

[0009] Preferably, the chamfered shape is formed into a C-chamfered shape or an R-chamfered shape so that the arc can move smoothly.

[0010] Preferably, at least one of the surface of the fixed terminal located in the arc extension direction or the surface of the movable contact piece located in the arc extension direction has an overall R shape within the arc passage range. In this case, the arc can move more smoothly.

[0011] Preferably, at least one of the fixed terminal or the movable contact piece includes a stop portion for stopping the movement of the arc end. The stop portion is positioned on the first side of the fixed terminal or on the second side of the movable contact piece. In this case, the stop portion can be used to purposefully stop the movement of the arc end. Furthermore, since the stop portion is positioned on the side opposite the contact point, the arc extension is less likely to be significantly hindered.

[0012] Preferably, the fixed terminal includes: a first fixed terminal including a first fixed contact serving as an anode contact; and a second fixed terminal including a second fixed contact. The movable contact piece includes a first movable contact serving as a cathode contact disposed opposite the first fixed contact, and a second movable contact disposed opposite the second fixed contact. The chamfered shape of the corner portion of the movable contact piece on the first direction side and the corner portion on the second direction side relative to the first movable contact in the arc extension direction is formed to be larger than the chamfered shape of the corner portion of the first direction side and the corner portion of the first fixed terminal on the first direction side and the corner portion on the second direction side relative to the first fixed contact in the arc extension direction. In this case, by forming the chamfered shape of the corner portion of the movable contact piece, which is disposed with the contact on the cathode side, where the arc is less likely to extend than the anode side, larger, the end of the arc can be smoothly moved to the surface of the movable contact piece on the first direction side.

[0013] According to the present invention, in the electromagnetic relay, the arc can be smoothly extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional schematic diagram of an electromagnetic relay.

[0015] Figure 2 This is a schematic diagram showing the interior of the storage unit as viewed from above.

[0016] Figure 3 This is a schematic cross-sectional view of the periphery of the first fixed contact as viewed from the first magnet toward the second magnet.

[0017] Figure 4 This is a schematic diagram of the first fixed terminal, the second fixed terminal, and the movable contact piece viewed from the rear toward the front.

[0018] Figure 5 It is a schematic diagram showing the chamfered shape of a corner portion according to another embodiment.

[0019] Figure 6 It is a schematic diagram showing the chamfered shape of a corner portion according to another embodiment.

[0020] Figure 7 It is a schematic diagram showing the chamfered shape of a corner portion according to another embodiment.

[0021] Figure 8 It is a schematic diagram showing the chamfered shape of a corner portion according to another embodiment.

[0022] Figure 9 It is a schematic diagram showing the chamfered shape of a corner portion according to another embodiment.

[0023] Figure 10 It is a schematic diagram showing the chamfered shape of a corner portion according to another embodiment.

[0024] Figure 11 It is a schematic diagram showing the chamfered shape of a corner portion according to another embodiment.

[0025] Figure 12 It is a schematic diagram showing the chamfered shape of a corner portion according to another embodiment.

[0026] Figure 13 It is a schematic diagram showing the chamfered shape of a corner portion according to another embodiment.

[0027] Description of reference numerals:

[0028] 6…magnet part;

[0029] C1…first corner;

[0030] C2…second corner;

[0031] C5…fifth corner;

[0032] C6…sixth corner;

[0033] 14…first fixed terminal;

[0034] 14: a first fixed contact (an example of a fixed contact);

[0035] 15…second fixed terminal;

[0036] 15…second fixed contact (an example of a fixed contact);

[0037] 16… movable contact piece;

[0038] 16: a first movable contact (an example of a movable contact);

[0039] 16 ... a second movable contact (an example of a movable contact);

[0040] 28…stop department;

[0041] 100…electromagnetic relay. DETAILED DESCRIPTION

[0042] Hereinafter, an embodiment of an electromagnetic relay according to one aspect of the present invention will be described with reference to the drawings. Figure 1 1 is a schematic cross-sectional view of the electromagnetic relay 100. Figure 1 As shown, the electromagnetic relay 100 includes a housing 2 , a contact device 3 , a drive shaft 4 , an electromagnetic drive device 5 , and a magnet portion 6 .

[0043] In addition, when referring to the drawings, for easy understanding of the description, Figure 1 In the description, the upper side is set as "up", the lower side is set as "down", the left side is set as "left", and the right side is set as "right". Figure 1 The direction perpendicular to the paper surface is described as the front-back direction. In addition, in this embodiment, Figure 1 The upper side of the diagram is the contact direction Z1. Figure 1 The lower side in the middle is the separation direction Z2. Details of the contact direction Z1 and the separation direction Z2 will be described later.

[0044] The housing 2 is a substantially rectangular box-shaped housing made of an insulating material. The housing 2 accommodates a contact device 3, a drive shaft 4, an electromagnetic drive device 5, and a magnet 6.

[0045] The housing 2 includes a housing portion 11. The housing portion 11 is formed of, for example, a substantially rectangular parallelepiped housing member disposed within the housing 2. The housing portion 11 is formed of an insulating material.

[0046] Figure 2 This is a schematic diagram of the interior of the housing portion 11 as viewed from above. The housing portion 11 includes a first inner wall surface 11a, a second inner wall surface 11b, a third inner wall surface 11c, and a fourth inner wall surface 11d. The first to fourth inner wall surfaces 11a to 11d are the front, rear, left, and right inner side surfaces of the housing portion 11, respectively. The first inner wall surface 11a and the second inner wall surface 11b extend in the up-down direction and the left-right direction. The first inner wall surface 11a and the second inner wall surface 11b are arranged opposite to each other in the front-to-back direction. The third inner wall surface 11c and the fourth inner wall surface 11d extend in the up-down direction and the front-to-back direction. The third inner wall surface 11c and the fourth inner wall surface 11d are arranged opposite to each other in the left-to-right direction. The left-to-right dimension of the first inner wall surface 11a and the second inner wall surface 11b is longer than the up-down dimension of the third inner wall surface 11c and the fourth inner wall surface 11d.

[0047] The housing portion 11 includes a housing space 12 for housing the contact device 3. In this embodiment, the housing space 12 is a substantially rectangular parallelepiped space isolated from the outside. The sides of the housing space 12 are surrounded by first to fourth inner wall surfaces 11a to 11d.

[0048] The contact device 3 includes a first fixed terminal 14, a second fixed terminal 15, a movable contact piece 16, and a contact piece holding portion 17. The first fixed terminal 14, the second fixed terminal 15, and the movable contact piece 16 are formed of a conductive material.

[0049] The first fixed terminal 14 and the second fixed terminal 15 are plate-shaped terminals extending in the left-right direction. The first fixed terminal 14 and the second fixed terminal 15 are arranged at intervals from each other in the left-right direction. The first fixed terminal 14 and the second fixed terminal 15 are an example of a pair of fixed terminals.

[0050] The first fixed terminal 14 includes a first fixed contact 14a and a first external connection portion 14b. The first fixed contact 14a is disposed within the housing space 12. The first external connection portion 14b protrudes leftward from the housing 2 and is exposed externally. The second fixed terminal 15 includes a second fixed contact 15a and a second external connection portion 15b. The second fixed contact 15a is disposed within the housing space 12. The second external connection portion 15b protrudes rightward from the housing 2 and is exposed externally.

[0051] like Figure 1 and Figure 2 As shown, the movable contact piece 16 is a plate-shaped member that is elongated in one direction and extends horizontally within the housing space 12. The movable contact piece 16 is spaced apart from the first inner wall surface 11a and the second inner wall surface 11b in the front-to-back direction within the housing space 12. Arc extension spaces 12a and 12b for extending the arc are provided between the movable contact piece 16 and the first inner wall surface 11a, and between the movable contact piece 16 and the second inner wall surface 11b, respectively. The arc extension spaces 12a and 12b are located near the first fixed contact 14a and the first movable contact 16a (described later), or near the second fixed contact 15a and the second movable contact 16b (described later).

[0052] The movable contact piece 16 is arranged within the accommodating space 12, spaced apart from the third inner wall surface 11c and the fourth inner wall surface 11d in the left-right direction. The movable contact piece 16 is arranged below the first fixed terminal 14 and the second fixed terminal 15. In this embodiment, the longitudinal direction of the movable contact piece 16 coincides with the left-right direction. Furthermore, the short side of the movable contact piece 16 coincides with the front-back direction.

[0053] The movable contact piece 16 includes a first movable contact 16a and a second movable contact 16b. The first movable contact 16a is arranged opposite the first fixed contact 14a and is capable of contacting the first fixed contact 14a. The second movable contact 16b is arranged with a gap in the left-right direction from the first movable contact 16a. The second movable contact 16b is arranged opposite the second fixed contact 15a and is capable of contacting the second fixed contact 15a.

[0054] The movable contact piece 16 is movable in a contact direction Z1 for contacting the first fixed contact 14a and the second fixed contact 15a and a separation direction Z2 for separating from the first fixed contact 14a and the second fixed contact 15a. The contact direction Z1 is an example of a first direction, and the separation direction Z2 is an example of a second direction.

[0055] The contact direction Z1 is the direction in which the first movable contact 16a and the second movable contact 16b contact the first fixed contact 14a and the second fixed contact 15a ( Figure 1The separation direction Z2 is the direction in which the first movable contact 16a and the second movable contact 16b move away from the first fixed contact 14a and the second fixed contact 15a ( Figure 1 ).

[0056] like Figure 1 As shown, the contact piece holding portion 17 holds the movable contact piece 16 via the drive shaft 4. The contact piece holding portion 17 connects the movable contact piece 16 to the drive shaft 4. The contact piece holding portion 17 includes a bracket 24 and a contact spring 25. The contact spring 25 urges the drive shaft 4 and the movable contact piece 16 toward the contact direction Z1.

[0057] The drive shaft 4 extends along the contact direction Z1 and the separation direction Z2 . The drive shaft 4 is movable in the contact direction Z1 and the separation direction Z2 together with the movable contact piece 16 .

[0058] The electromagnetic drive device 5 drives the contact device 3. The electromagnetic drive device 5 moves the movable contact piece 16 in the contact direction Z1 and the separation direction Z2 together with the drive shaft 4 by electromagnetic force. The electromagnetic drive device 5 is arranged below the accommodating portion 11 in the housing 2.

[0059] The electromagnetic drive device 5 includes a movable iron core 31, a fixed iron core 32, and a yoke 33. The electromagnetic drive device 5 also includes a coil, a bobbin, and a coil spring (not shown). The electromagnetic drive device 5 has the same structure as conventional devices, so detailed description thereof will be omitted.

[0060] The magnet portion 6 generates a magnetic field in the housing portion 11, and the magnetic field is used to extend the arc generated between the first fixed contact 14a and the first movable contact 16a and between the second fixed contact 15a and the second movable contact 16b. Figure 1 As shown, the magnet portion 6 includes a first magnet 6a and a second magnet 6b. The first magnet 6a and the second magnet 6b are permanent magnets.

[0061] The first magnet 6a and the second magnet 6b extend in the front-to-back direction and the up-down direction. In the present embodiment, the first magnet 6a and the second magnet 6b are fixed to the outer periphery of the housing portion 11. The first magnet 6a and the second magnet 6b are arranged around the housing portion 11 so that opposite poles are opposed to each other in the longitudinal direction of the movable contact piece 16. The first magnet 6a is arranged so that the north pole faces the housing portion 11. The second magnet 6b is arranged so that the south pole faces the housing portion 11. By thus arranging the first magnet 6a and the second magnet 6b, a magnetic flux flows in a direction substantially parallel to the short side direction of the movable contact piece 16 within the housing portion 11.

[0062] Next, the operation of electromagnetic relay 100 will be described. Note that the operation of electromagnetic relay 100 is the same as that of the related art, and therefore the description will be brief.

[0063] Figure 1 Indicates the state of applying voltage to the coil. When voltage is applied to the coil, the movable iron core 31 overcomes the elastic force of the coil spring and moves in the contact direction Z1. As the movable iron core 31 moves in the contact direction Z1, the drive shaft 4 and the movable contact piece 16 move in the contact direction Z1, and the first movable contact 16a and the second movable contact 16b contact the first fixed contact 14a and the second fixed contact 15a. If the application of voltage to the coil is stopped, the movable iron core 31 moves in the separation direction Z2 together with the movable contact piece 16 due to the elastic force of the coil spring. As a result, the first movable contact 16a and the second movable contact 16b are separated from the first fixed contact 14a and the second fixed contact 15a. When the first movable contact 16a and the second movable contact 16b are separated from the first fixed contact 14a and the second fixed contact 15a, arcs are generated between the first movable contact 16a and the first fixed contact 14a and between the second movable contact 16b and the second fixed contact 15a.

[0064] Here, if Figure 2 As shown, for example, when current flows from first fixed contact 14a to first movable contact 16a, a Lorentz force F1 acts on the arc generated between first fixed contact 14a and first movable contact 16a in the direction toward second inner wall surface 11b. Consequently, the arc extends within arc extension space 12a. Furthermore, a Lorentz force F2 acts on the arc generated between second fixed contact 15a and second movable contact 16b in the direction toward first inner wall surface 11a. Consequently, the arc extends within arc extension space 12b. Furthermore, when current flows from first movable contact 16a to first fixed contact 14a, the directions of the Lorentz force F1 and the Lorentz force F2 acting on the arc are opposite to those described above. In this embodiment, unless otherwise specified, the direction of current flow is from first fixed contact 14a to first movable contact 16a.

[0065] Figure 3 This is a schematic cross-sectional view of the periphery of the first fixed contact 14a viewed from the direction of the first magnet 6a toward the second magnet 6b. Figure 3 , a state in which the arc is extended toward the second inner wall surface 11 b by the Lorentz force F1 acting on the arc is schematically shown.

[0066] The first fixed terminal 14 includes a first surface 20a, a second surface 20b, a third surface 20c, and a fourth surface 20d. The first surface 20a is the surface on the separation direction Z2 side of the first fixed terminal 14. The second surface 20b is the surface on the opposite side of the first surface 20a and is the surface on the contact direction Z1 side of the first fixed terminal 14. The first surface 20a and the second surface 20b extend in the front-to-back direction and the left-to-right direction. In this embodiment, the first surface 20a and the second surface 20b have a flat shape. The third surface 20c is the rear surface of the first fixed terminal 14. The fourth surface 20d is the surface on the opposite side of the third surface 20c and is the front surface of the first fixed terminal 14. The third surface 20c and the fourth surface 20d extend in the top-to-bottom direction and the left-to-right direction.

[0067] The first fixed terminal 14 further includes a first corner portion C1, a second corner portion C2, a third corner portion C3, and a fourth corner portion C4. The first corner portion C1 is located between the second surface 20b and the third surface 20c. The second corner portion C2 is located between the first surface 20a and the third surface 20c. The third corner portion C3 is located between the first surface 20a and the fourth surface 20d. The fourth corner portion C4 is located between the second surface 20b and the fourth surface 20d.

[0068] The first corner C1 is an example of a corner located on the contact direction Z1 side of the first fixed terminal 14 in the arc extension direction. The second corner C2 is an example of a corner located on the separation direction Z2 side of the first fixed terminal 14 in the arc extension direction. The arc extension direction is the same direction as the Lorentz force F1 acting on the arc.

[0069] The first to fourth corners C1 to C4 have chamfered shapes. In this embodiment, the first to fourth corners C1 to C4 are respectively rounded, and the first and second surfaces 20a and 20b are smoothly connected to the third and fourth surfaces 20c and 20d.

[0070] The movable contact piece 16 includes a first surface 30a, a second surface 30b, a third surface 30c, and a fourth surface 30d. The first surface 30a is the surface on the contact direction Z1 side of the movable contact piece 16 and is opposite the first surface 20a of the first fixed terminal 14. The second surface 3b is the surface on the opposite side of the first surface 30a and is the surface on the separation direction Z2 side of the movable contact piece 16. The first surface 30a and the second surface 30b extend in the front-to-back direction and the left-to-right direction. In this embodiment, the first surface 30a and the second surface 30b have a flat shape. The third surface 30c is the rear surface of the movable contact piece 16. The fourth surface 20d is the surface on the opposite side of the third surface 30c and is the front surface of the movable contact piece 16. The third surface 30c and the fourth surface 30d extend in the vertical direction and the left-to-right direction.

[0071] The movable contact piece 16 also includes a fifth corner C5, a sixth corner C6, a seventh corner C7, and an eighth corner C8. The fifth corner C1 is located between the second surface 30b and the third surface 30c. The sixth corner C5 is located between the first surface 30a and the third surface 30c. The seventh corner C7 is located between the first surface 30a and the fourth surface 30d. The eighth corner C8 is located between the second surface 30b and the fourth surface 30d. The fifth corner C5 is an example of a corner of the movable contact piece 16 located on the separation direction Z2 side in the arc extension direction. The sixth corner C6 is an example of a corner of the movable contact piece 16 located on the contact direction Z1 side in the arc extension direction.

[0072] The fifth to eighth corners C5 to C8 have chamfered shapes. In this embodiment, the fifth to eighth corners C5 to C8 are respectively rounded, and the first and second surfaces 30a and 30b are smoothly connected to the third and fourth surfaces 30c and 30d.

[0073] The distance from the first fixed contact 14a to the second corner C2 is the same as the distance from the first movable contact 16a to the sixth corner C6. The distance from the first fixed contact 14a to the third corner C3 is the same as the distance from the first movable contact 16a to the seventh corner C7.

[0074] Figure 4 This is a diagram for explaining the range of the chamfered shape having the first to eighth corners C1 to C8, and is a schematic diagram of the first fixed terminal 14, the second fixed terminal 15 and the movable contact piece 16 viewed from the rear toward the front. Figure 4 As shown, the first to eighth corners C1 to C8 may be chamfered only in at least the range R1 through which the arc ends pass, or only in the vicinity of range R1. For example, range R1 through which the arc ends pass is the range near first fixed contact 14a of first fixed terminal 14, located in the arc extension direction. Alternatively, range R1 may be the range near first movable contact 16a of movable contact piece 16, located in the arc extension direction. Alternatively, the first to eighth corners C1 to C8 may be chamfered throughout range R2.

[0075] like Figure 3 As shown, when Lorentz force F1 acts on the arc generated between first fixed contact 14a and first movable contact 16a, the arc extends toward second inner wall surface 11b. At this time, end A1 of the arc on the first fixed contact 14a side moves from first fixed contact 14a through first surface 20a, second corner C2, third surface 20c, and first corner C1 to second surface 20b. Furthermore, end A2 of the arc on the first movable contact 16a side moves from first movable contact 16a through first surface 30a, sixth corner C6, third surface 30c, and fifth corner C5 to second surface 30b.

[0076] Here, the first corner C1 and the fifth corner C5 have a chamfered shape, so when the arc is extended by the Lorentz force F1, the ends A1 and A2 of the arc move smoothly from the first surface 20a and 30a to the second surface 20b and 30b. That is, it is possible to prevent the ends A1 and A2 of the arc from being retained at the first corner C1 and the fifth corner C5 and hindering the extension of the arc. As a result, the arc can be quickly extinguished. In addition, in this embodiment, since the second corner C2 and the sixth corner C6 have a chamfered shape, the ends A1 and A2 of the arc can move more smoothly from the first surface 20a and 30a to the second surface 20b and 30b, thereby quickly extinguishing the arc.

[0077] Furthermore, the second fixed terminal 15 is symmetrical with the first fixed terminal 14 across the drive shaft 4, and the movable contact piece 16 is symmetrical across the drive shaft 4. Therefore, even when an arc is generated between the second fixed contact 15a and the second movable contact 16b and the arc is stretched by the Lorentz force F2, the same effect as described above can be achieved.

[0078] While the above describes an embodiment of an electromagnetic relay according to one aspect of the present invention, the present invention is not limited to the aforementioned embodiment and various modifications may be made without departing from the spirit of the invention. For example, the shape or arrangement of the housing 2, contact device 3, drive shaft 4, electromagnetic drive device 5, or housing 11 may also be modified.

[0079] For example, the first fixed terminal 14 and the second fixed terminal 15 may be bent into a substantially L-shape within the housing 2. Alternatively, the first fixed terminal 14 and the second fixed terminal 15 may be disposed below the movable contact piece 16, and the electromagnetic drive device 5 may be used to pull the movable contact piece 16 toward the first fixed terminal 14 and the second fixed terminal 15.

[0080] In the above embodiment, the magnetic field generated by the magnet portion 6 causes the Lorentz forces F1 and F2 to act in a direction parallel to the short side direction of the movable contact piece 16. However, the magnetic field generated by the magnet portion 6 may also cause the Lorentz forces F1 and F2 to act in a direction parallel to the long side direction of the movable contact piece 16. In this case, the corners at both ends of the movable contact piece 16 in the long side direction may have a chamfered shape.

[0081] The chamfered shapes of the first to eighth corners C1 to C8 may be formed only at the corners located in the arc extension direction. Figure 5 As shown in FIG, the chamfered shapes of the first to eighth corners C1 to C8 may also be C-chamfered shapes. Figure 6As shown, for example, other components 26 such as resin are arranged on the second surface 20b side of the first fixed terminal 14. If it is not desired to move the arc to the second surface 20b side, only the second corner C2 and the third corner C3 may be chamfered. Figure 7 As shown, the entire third surface 20c and the fourth surface 20d may also be formed by arcuate surfaces. Similarly, the entire third surface 30c and the fourth surface 30d may also be formed by arcuate surfaces.

[0082] like Figure 8 As shown, the chamfer shapes of the first corner C1 and the second corner C2 may be different. Similarly, the chamfer shapes of the fifth corner C5 and the sixth corner C6 may be different. For example, the chamfer shape of either the first corner C1 or the second corner C2 may be larger than the chamfer shape of the other.

[0083] like Figure 9 As shown, when the electromagnetic relay 100 has polarity, the chamfered shape of the contact on the cathode side where the arc is difficult to extend may be formed larger than the chamfered shape of the contact on the anode side. Figure 9 For example, first fixed contact 14a is formed as an anode-side contact, and first movable contact 16a is formed as a cathode-side contact. The chamfered shapes of fifth corner C5 and sixth corner C6 are formed larger than those of first corner C1 and second corner C2. This allows the end of the arc on the cathode side (first movable contact 16a side) to move smoothly from first surface 30a to second surface 30b.

[0084] like Figure 10 As shown, the first fixed terminal 14 may also be a cylindrical terminal. In this case, the outer peripheral portion 14c of the end surface of the first fixed terminal 14 on the separation direction Z2 side may also have a chamfered shape. Furthermore, the second fixed terminal 15 may also have the same structure as the first fixed terminal 14.

[0085] like Figure 11 (A) and Figure 11 As shown in (B), for example, the chamfered shape of the first corner C1 and the chamfered shape of the fourth corner C4 may also be connected to each other. Figure 11 As shown in (A), the first corner C1 and the fourth corner C4 may be connected to form an arc shape. Figure 11 As shown in (B), the first corner portion C1 and the fourth corner portion C4 may also be formed in a C-chamfered shape, and one end of the first corner portion C1 and one end of the second corner portion C4 may be connected to each other.

[0086] like Figure 12As shown, for example, if it is desired to stop the movement of the end of the arc at a predetermined position, a stop portion 28 for stopping the movement of the end of the arc may be provided. For example, the stop portion 28 may be formed by a corner portion 29a of a recess 29 formed by recessing the second surface 20b of the first fixed terminal 14. Alternatively, the stop portion 28 may be provided on the second fixed terminal 15 or the movable contact piece 16.

[0087] like Figure 13 As shown in (A), the first fixed contact 14a may be arranged to be flush with the first surface 20a. Alternatively, Figure 13 As shown in (B), the first fixed contact 14a may be integral with the first fixed terminal 14. In this case, the first surface 20a of the first fixed terminal 14 contacts the first movable contact 16a or the movable contact piece 16. Alternatively, this structure may be applied to the first fixed terminal 14 or the movable contact piece 16.

[0088] Industrial applicability

[0089] According to the present invention, in the electromagnetic relay, the arc can be smoothly extended.

Claims

1. An electromagnetic relay, It is characterized in that have: A pair of fixed terminals including fixed contacts; a movable contact piece including a movable contact arranged opposite to the fixed contact and movable in a first direction in which the movable contact contacts the fixed contact and in a second direction in which the movable contact separates from the fixed contact; and a magnet portion that generates a magnetic field for extending an arc generated between the fixed contact and the movable contact, At least one of a corner portion of the fixed terminal on the first direction side in the arc extension direction of the arc extension or a corner portion of the movable contact piece on the second direction side in the arc extension direction has a chamfered shape within a range where the arc passes. At least one of the fixed terminal or the movable contact piece includes a stopper for stopping movement of an end portion of the arc. The stop portion is arranged on the first direction side of the fixed terminal or on the second direction side of the movable contact piece.

2. An electromagnetic relay, It is characterized in that have: A pair of fixed terminals including fixed contacts; a movable contact piece including a movable contact arranged opposite to the fixed contact and movable in a first direction in which the movable contact contacts the fixed contact and in a second direction in which the movable contact separates from the fixed contact; and a magnet portion that generates a magnetic field for extending an arc generated between the fixed contact and the movable contact, At least one of a corner portion of the fixed terminal on the first direction side in the arc extension direction of the arc extension or a corner portion of the movable contact piece on the second direction side in the arc extension direction has a chamfered shape within a range where the arc passes. The fixed terminal includes a first fixed terminal including a first fixed contact and a second fixed terminal including a second fixed contact, The movable contact piece includes a first movable contact arranged opposite to the first fixed contact and a second movable contact arranged opposite to the second fixed contact. The first fixed contact is an anode contact, The first movable contact is a cathode contact, The chamfered shape of the corner on the first direction side and the corner on the second direction side of the movable contact piece located in the arc extension direction relative to the first movable contact is formed to be larger than the chamfered shape of the corner on the first direction side and the corner on the second direction side of the first fixed terminal located in the arc extension direction relative to the first fixed contact.

3. The electromagnetic relay according to claim 1 or 2, It is characterized in that At least one of a corner portion of the fixed terminal located on the second direction side in the arc extension direction or a corner portion of the movable contact piece located on the first direction side in the arc extension direction has a chamfered shape within a range where the arc passes.

4. The electromagnetic relay according to claim 1 or 2, It is characterized in that The chamfered shape is a C chamfered shape or an R chamfered shape.

5. The electromagnetic relay according to claim 1 or 2, It is characterized in that At least one of a surface of the fixed terminal located in the arc extension direction or a surface of the movable contact piece located in the arc extension direction has an R shape as a whole within a range where the arc passes.

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