WO2020044608A1

WO2020044608A1 - Electromagnetic relay

Info

Publication number: WO2020044608A1
Application number: PCT/JP2019/005934
Authority: WO
Inventors: 航平大塚; 亮太箕輪; 岩坂　博之; 靖雄林田; 真吾森; 直樹川口
Original assignee: オムロン株式会社
Priority date: 2018-08-28
Filing date: 2019-02-18
Publication date: 2020-03-05
Also published as: JP2020035562A; JP7143679B2

Abstract

This electromagnetic relay is provided with a fixed terminal, a fixed contact, a fixed contact, a movable contact arm, and a movable contact. The fixed contact is disposed on the fixed terminal. The movable contact arm includes a contact arm body, one end of which faces a portion of the fixed contact, a first flat surface that is formed on one end side of the contact arm body and that does not overlap the fixed contact in a plan view, and a first step part that is formed in a recessed manner from the first flat surface and extends to the one end of the contact arm body. The movable contact is disposed in the first step part of the movable contact arm so as to be flush with the first flat surface, and is capable of coming into contact with the fixed contact.

Description

Electromagnetic relay

The present invention relates to an electromagnetic relay.

電磁 Conventionally, electromagnetic relays for opening and closing electric circuits are known. For example, the electromagnetic relay of Patent Document 1 includes a fixed terminal, a fixed contact disposed on the fixed terminal, a movable contact piece, and a movable contact disposed on the movable contact piece. The movable contact can contact the fixed contact, and when the movable contact comes into contact with or separates from the fixed contact, an electric circuit is opened and closed. Further, the electromagnetic relay is provided with a permanent magnet for extending an arc generated when the movable contact is separated from the fixed contact (see Patent Document 1).

Japanese Patent No. 6281301

In the electromagnetic relay of Patent Document 1, the fixed contact protrudes from the fixed terminal toward the movable contact. The movable contact projects from the movable contact piece toward the fixed contact. For this reason, steps occur between the fixed contact and the fixed terminal and between the movable contact and the movable contact piece.

(4) If there is a step between the fixed contact and the fixed terminal and between the movable contact and the movable contact piece, when the arc is generated, the arc sticks to the step, and the elongation of the arc is hindered. For this reason, it is necessary to use an unnecessarily strong magnet to extend the arc. In addition, when the arc is stuck, the arc interruption time becomes long, so that the contact is worn out and the life of the electromagnetic relay may be shortened.

課題 The object of the present invention is to suppress arc sticking when the movable contact is separated from the fixed contact.

(1) An electromagnetic relay according to one aspect of the present invention includes a fixed terminal, a fixed contact, a movable contact piece, a movable contact, a drive shaft, and an electromagnetic drive device. The fixed contact is arranged on the fixed terminal. The movable contact piece includes a contact piece main body having one end facing a part of the fixed contact, a first flat surface formed on one end side of the contact piece main body and not overlapping with the fixed contact in plan view, and formed concavely from one flat surface. And a first step portion extending to one end of the contact piece main body. The movable contact is arranged on the first step portion of the movable contact piece so as to be flush with the first flat surface, and can contact the fixed contact. The drive shaft is connected to the movable contact piece so as to be integrally movable. The electromagnetic drive device moves the drive shaft in a contact direction in which the fixed contact and the movable contact are in contact with each other, and in a separating direction in which the fixed contact and the movable contact are separated.

In this electromagnetic relay, since the movable contact is arranged on the first step portion so as to be flush with the first flat surface of the movable contact piece, no step is generated between the movable contact and the movable contact piece. For this reason, when an arc is generated, it is possible to suppress the arc from sticking between the movable contact and the movable contact piece. In addition, arranging the movable contact on the first step facilitates positioning of the movable contact. Further, since the first step extends to one end of the contact piece main body, one end of the first step is open. For this reason, when resistance-welding the movable contact to the movable contact piece, displacement of the electrode toward the open side can be tolerated, so that the size and positioning of the electrode during resistance welding are facilitated.

(2) Preferably, the first flat surface of the movable contact piece does not overlap with the fixed terminal in plan view. In this case, it is possible to prevent the first flat surface of the movable contact piece from contacting the fixed terminal.

(3) Preferably, the fixed contact is movable when an end nearer to the axis of the drive shaft overlaps with the movable contact in a plan view, and an end farther from the axis of the drive shaft does not overlap with the movable contact. In the plan view, the end of the contact farther from the axis of the drive shaft overlaps with the fixed contact, and the end closer to the axis of the drive shaft does not overlap with the movable contact. In this case, even when the position of the movable contact piece shifts during the movement of the movable contact piece, the movable contact can be brought into contact with the fixed contact.

(4) Preferably, the fixed terminal has a terminal body having one end facing a part of the movable contact, a second flat surface parallel to the first flat surface of the movable contact piece and not overlapping with the movable contact in plan view. A second stepped portion formed from the second flat surface and extending to one end of the terminal body. The fixed contact is disposed on the second step portion of the fixed contact so as to be flush with the second flat surface. In this case, no step is generated between the fixed contact and the fixed terminal, and an arc is generated. At times, it is possible to prevent the arc from sticking between the fixed contact and the fixed terminal.

(5) Preferably, the second flat surface of the fixed terminal does not overlap with the movable contact piece in plan view. In this case, it is possible to prevent the movable contact piece from contacting the second flat surface of the fixed terminal.

(6) Preferably, the first flat surface of the movable contact is arranged in a direction in which the arc is extended. In the width direction of the movable contact piece, the dimension of the fixed contact is smaller than the dimension of the movable contact. In this case, when the movable contact contacts the fixed contact, the movable contact piece can be prevented from contacting the fixed terminal. In addition, by arranging the first flat surface in the direction in which the arc is extended, it is possible to suppress wear of the movable contact when the arc is extended.

(7) Preferably, the second flat surface of the fixed contact is arranged in a direction in which the arc is extended. The dimension of the movable contact in the width direction of the movable contact piece is smaller than the dimension of the fixed contact. In this case, it is possible to suppress the consumption of the fixed contact when the arc is extended.

(8) Preferably, the first step of the movable contact piece is rectangular in plan view, formed over the entire length of the movable contact piece in the width direction, and the second step of the fixed terminal is viewed in plan. It has a rectangular shape and is formed over the entire length of the fixed terminal in the width direction. In this case, the movable contact and the fixed contact can be stably contacted.

According to the present invention, the sticking of the arc when the movable contact is separated from the fixed contact can be suppressed.

It is a sectional view of an electromagnetic relay concerning one embodiment of the present invention. FIG. 3 is an enlarged cross-sectional view around a movable contact piece. It is the figure which looked around the 1st fixed contact from the separation direction side. It is the figure which looked around the 1st fixed contact from the contact direction side. It is sectional drawing of the electromagnetic relay when a voltage is applied to a coil. It is the figure which looked around the 1st fixed contact concerning a 1st modification from the separation direction side. It is the figure which looked at the circumference of the 1st fixed contact concerning a 2nd modification from the separation direction side. FIG. 13 is an enlarged schematic diagram around a movable contact piece according to a third modification.

Hereinafter, an embodiment of an electromagnetic relay according to one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of the electromagnetic relay 100. As shown in FIG. 1, the electromagnetic relay 100 includes a housing 2, a contact device 3, a drive shaft 4, and an electromagnetic drive device 5. In the following description, the direction in which the axis Ax of the drive shaft 4 extends is referred to as “axial direction”. In addition, when referring to the drawings, the upper side in FIG. 1 will be described as “upper”, the lower side as “lower”, the left side as “left”, and the right side as “right” for easy understanding. In this embodiment, the lower part in FIG. 1 is the contact direction Z1. The upper direction in FIG. 1 is the separation direction Z2. The details of the contact direction Z1 and the separation direction Z2 will be described later.

The housing 2 includes a case 2a and a cover 2b. The case 2a has a substantially rectangular box shape and is open at the top. The cover 2b covers the upper part of the case 2a. The interior of the housing 2 is sealed by a case 2a and a cover 2b. The case 2a and the cover 2b are formed of an insulating material. Inside the housing 2, a contact device 3, a drive shaft 4, and an electromagnetic drive device 5 are accommodated.

In the housing 2, a contact case 11 in which the contact device 3 is accommodated and a contact cover 12 that covers the contact case 11 from above are arranged. The contact case 11 and the contact cover 12 are formed of an insulating material.

The contact case 11 includes a bottom 11a, a cylindrical portion 11b, a first contact support 11c, and a second contact support 11d. The bottom 11a is formed in a rectangular and plate-like shape. The longitudinal direction of the bottom 11a matches the left-right direction in FIG.

The cylindrical portion 11b extends in a cylindrical shape in the axial direction. The cylindrical portion 11b protrudes downward from the center of the bottom 11a and protrudes upward from the center of the bottom 11a. The cylindrical portion 11b includes a through hole 18 that passes through the bottom portion 11a in the axial direction. The through hole 18 passes through the center of the bottom 11a in the axial direction. The drive shaft 4 passes through the through hole 18 in the axial direction.

The first contact support 11c is disposed on the left side of the center of the bottom 11a in the longitudinal direction. The first contact support portion 11c is formed to protrude upward in a rectangular shape from the bottom portion 11a. The second contact support portion 11d is disposed on the right side of the center of the bottom portion 11a in the longitudinal direction. The second contact support portion 11d is formed to protrude upward in a rectangular shape from the bottom portion 11a.

The contact cover 12 covers the upper part of the contact case 11. The contact cover 12 includes an arc extension wall 12a extending toward the bottom 11a. The arc extension wall 12a is formed of, for example, a resin or a ceramic material such as aluminum oxide.

The contact device 3 includes a first fixed terminal 14, a second fixed terminal 15, a first fixed contact 16, a second fixed contact 17, a movable contact piece 20, a first movable contact 26, and a second movable contact. 27 and a contact piece holding portion 30. The first fixed terminal 14, the second fixed terminal 15, the first fixed contact 16, the second fixed contact 1, the movable contact piece 20, the first movable contact 26, and the second movable contact 27 are made of a conductive material. Is formed.

The first fixed terminal 14 extends in the left-right direction, and is supported in the housing 2 by the first contact support 11c of the contact case 11. FIG. 2 is an enlarged view around the movable contact piece 20 in FIG. FIG. 3 is a view of the periphery of the first fixed contact 16 viewed from the separation direction Z2 side. FIG. 4 is a view of the periphery of the first fixed contact 16 viewed from the contact direction Z1 side. As shown in FIGS. 1 to 4, the first fixed terminal 14 includes a terminal body 14a, a flat surface 14b, a step 14c, and an external connection 14d. The flat surface 14b is an example of a second flat surface, and the step 14c is an example of a second step.

The terminal body 14a extends in the left-right direction, and an end 14e of the drive shaft 4 closer to the axis Ax faces a part of the first movable contact 26.

The flat surface 14b is provided on a part of the surface of the contact case 11 on the side of the opening direction Z2. The flat surface 14b has a flat shape along a direction orthogonal to the drive shaft 4. The flat surface 14b is arranged near the end 14e. The flat surface 14b does not overlap with the first movable contact 26 in plan view. The flat surface 14b does not overlap with the movable contact piece 20 in a plan view.

The step portion 14c is formed at the end 14e of the terminal body 14a. Specifically, the step portion 14c is formed to be recessed from the flat surface 14b and extends to the end portion 14e of the terminal main body 14a. The step portion 14c is formed such that a part of the flat surface 14b is cut out from the outer edge of the flat surface 14b. As shown in FIGS. 3 and 4, in the present embodiment, the step portion 14c has a rectangular shape in plan view, and extends in the width direction between the pair of

side portions

14f, 14g of the terminal body 14a. The step portion 14c is formed over the entire length of the first fixed terminal 14 in the width direction. Therefore, the step 23a has a shape in which both ends in the width direction and the end 14e are open. Thereby, when the first fixed contact 16 is resistance-welded to the first fixed terminal 14, the displacement of the electrode to the open side can be allowed, so that the size and positioning of the electrode during the resistance welding are facilitated. . The external connection part 14d protrudes from the case 2a in the left-right direction.

The second fixed terminal 15 extends in the left-right direction, and is supported in the housing 2 by the second contact supporting portion 11d of the contact case 11. The second fixed terminal 15 includes a terminal body 15a, a flat surface 15b, a step portion 15c, and an external connection portion 15d. As shown in FIG. 1, the second fixed terminal 15 is symmetrical to the first fixed terminal 14 with respect to the axis Ax of the drive shaft 4, and thus the description is omitted.

The first fixed contact 16 is connected to the first fixed terminal 14. The first fixed contact 16 has a flat shape whose surface on the side of the separation direction Z <b> 2 is along a direction orthogonal to the drive shaft 4. The first fixed contact 16 is arranged on the step portion 14c of the first fixed terminal 14 so as to be flush with the flat surface 14b. Therefore, the surface of the first fixed contact 16 on the side of the separation direction Z2 is connected to the flat surface 14b without any step. The first fixed contact 16 is arranged over the entire step 14c so as to fill up the step between the flat surface 14b and the step 14c. That is, the first fixed contact 16 has a rectangular shape in plan view, and entirely overlaps the bottom of the step portion 14c.

The first fixed contact 16 extends to the end 14e of the terminal body 14a in the longitudinal direction of the first fixed terminal 14. The first fixed contact 16 extends over the entire length of the terminal body 14 a in the width direction of the first fixed terminal 14. By arranging the first fixed contact 16 on the step portion 14c, the positioning of the first fixed contact 16 when the first fixed contact 16 is welded to the first fixed terminal 14 becomes easy.

The second fixed contact 17 is connected to the second fixed terminal 15. The second fixed contact 17 is arranged on the step 15c of the second fixed terminal 15 so as to be flush with the flat surface 15b. Since the second fixed contact 17 has a symmetrical shape with respect to the first fixed contact 16 with respect to the axis Ax of the drive shaft 4, the description is omitted.

The movable contact piece 20 extends in the left-right direction in the contact case 11. The movable contact piece 20 is arranged to face a part of the first fixed terminal 14 and a part of the second fixed terminal 15. Note that the movable contact piece 20 does not contact the first fixed terminal 14, the second fixed terminal 15, the first fixed contact 16, and the second fixed contact 17.

The movable contact piece 20 includes a contact piece main body 21, a flat surface 22a, a flat surface 22b, a step 23a, and a step 23b. The

flat surfaces

22a and 22b are examples of a first flat surface, and the

steps

23a and 23b are examples of a first step.

The contact piece main body 21 extends in the left-right direction, and the drive shaft 4 passes through the center in the axial direction. The contact piece main body 21 has a first end 21 a facing a part of the first fixed contact 16, and a second end 21 b facing a part of the second fixed contact 17.

The flat surface 22a is provided on a part of the surface on the side of the contact direction Z1 on the first end 21a side of the contact piece main body 21. The flat surface 22a is parallel to the flat surface 14b of the first fixed terminal 14, and has a flat shape along a direction orthogonal to the drive shaft 4. The flat surface 22a is arranged near the first end 21a of the contact piece main body 21. The flat surface 22a does not overlap with the first fixed contact 16 in plan view. The flat surface 22a does not overlap with the first fixed terminal 14 in a plan view. The flat surface 22b is symmetrical to the flat surface 22a with respect to the axis Ax of the drive shaft 4, and a description thereof will be omitted.

The step 23a is formed at the first end 21a of the contact piece main body 21. Specifically, the step 23 a is formed so as to be recessed from the flat surface 22 a and extends to the first end 21 a of the contact piece main body 21. The step portion 23a is formed such that a part of the flat surface 22a is cut out from the outer edge of the flat surface 22a. In the present embodiment, the step portion 23a is rectangular in plan view, and extends in the width direction between the pair of

side portions

21c and 21d of the contact piece main body 21. The step portion 23a is formed over the entire length of the movable contact piece 20 in the width direction. Therefore, the step 23a has a shape in which both ends in the width direction and the first end 21a side are open. Thereby, when the first movable member 26 is resistance-welded to the movable contact piece 20, displacement of the electrode to the open side can be allowed, so that the size and positioning of the electrode at the time of resistance welding are facilitated. The step portion 23b is symmetrical with the step portion 23a with respect to the axis Ax of the drive shaft 4, and a description thereof will be omitted.

The movable contact piece 20 is movable in a contact direction Z1 that contacts the first fixed contact 16 and the second fixed contact 17 and a separation direction Z2 that is separated from the first fixed contact 16 and the second fixed contact 17.

The contact direction Z1 is a direction in which the first movable contact 26 and the second movable contact 27 contact the first fixed contact 16 and the second fixed contact 17 (downward in FIG. 1). The separation direction Z2 is a direction in which the first movable contact 26 and the second movable contact 27 are separated from the first fixed contact 16 and the second fixed contact 17 (upward in FIG. 1). The contact direction Z1 and the separation direction Z2 coincide with the axial direction.

The first movable contact 26 is connected to the movable contact piece 20. The first movable contact 26 has a flat shape whose surface on the side of the contact direction Z <b> 1 is along a direction orthogonal to the drive shaft 4. The first movable contact 26 is arranged on the step portion 23a of the movable contact piece 20 so as to be flush with the flat surface 22a. Therefore, the surface of the first movable contact 26 on the contact direction side Z <b> 1 is connected to the flat surface 22 a of the movable contact piece 20 without any step. The first movable contact 26 is arranged over the entire step 23a so as to fill up the step between the flat surface 22a of the movable contact piece 20 and the step 23a. That is, the first movable contact 26 has a rectangular shape in plan view, and entirely overlaps the bottom of the step portion 23a. Note that the first movable contact 26 is approximately the same size as the first fixed contact 16.

The first movable contact 26 extends to the first end 21 a of the contact piece main body 21 in the longitudinal direction of the movable contact piece 20. The first movable contact 26 extends over the entire length of the contact piece main body 21 in the width direction of the movable contact piece 20. By arranging the first movable contact 26 on the step 23a of the movable contact piece 20, the positioning of the first movable contact 26 when welding the first movable contact 26 to the movable contact piece 20 becomes easy.

The first movable contact 26 is partially disposed so as to face the first fixed contact 16, and can contact the first fixed contact 16. More specifically, the end of the first movable contact 26 that is farther from the axis Ax of the drive shaft 4 overlaps with the first fixed contact 16 in plan view, and the end that is closer to the axis Ax of the drive shaft 4 is the first end. Do not overlap with one fixed contact 16. On the other hand, in plan view, the first fixed contact 16 has an end closer to the drive shaft 4 and the first movable contact 26, and an end farther from the axis Ax of the drive shaft 4 and the first movable contact 26. Do not overlap. As described above, by disposing the part of the first movable contact 26 and the part of the first fixed contact 16 so as to be shifted from each other, the position of the movable contact piece 20 when the movable contact piece 20 moves is adjusted. The first movable contact 26 can be brought into contact with the first fixed contact 16 even when the position is shifted.

The second movable contact 27 is connected to the movable contact piece 20. The second movable contact 27 is disposed so as to partially face the second fixed contact 17 and can contact the second fixed contact 17. The second movable contact 27 has a symmetrical shape with respect to the second movable contact 27 with respect to the axis Ax of the drive shaft 4, and a description thereof will be omitted.

The contact piece holding section 30 holds the movable contact piece 20 via the drive shaft 4. The contact piece holding section 30 connects the movable contact piece 20 and the drive shaft 4. The contact piece holding section 30 includes a holder 24 and a contact spring 25. The movable contact piece 20 is sandwiched between the upper part of the holder 24 and the flange 4 a of the drive shaft 4 in the axial direction. The contact spring 25 is disposed between the bottom of the holder 24 and the flange 4a of the drive shaft 4, and urges the drive shaft 4 and the movable contact piece 20 toward the separating direction Z2.

The drive shaft 4 extends along the contact direction Z1 and the separation direction Z2. The drive shaft 4 is connected to the movable contact piece 20 via the contact piece holding section 30. The drive shaft 4 is movable together with the movable contact piece 20 in the contact direction Z1 and the separation direction Z2.

The electromagnetic drive device 5 moves the drive shaft 4 in the contact direction Z1 by the electromagnetic force. The electromagnetic drive device 5 is disposed below the contact case 11 in the housing 2.

The electromagnetic drive device 5 includes a coil 32, a spool 33, a movable core 34, a fixed core 35, a biasing member 36, and a yoke 37.

The coil 32 is mounted on the outer periphery of the spool 33. The spool 33 includes a storage part 33a. The accommodating portion 33a is provided on an inner peripheral portion of the spool 33. The accommodation portion 33a has a cylindrical shape and extends along the axial direction.

The movable iron core 34 is arranged in the housing part 33a. The movable core 34 has a cylindrical shape, and the drive shaft 4 penetrates the center in the axial direction, and is connected to the drive shaft 4 so as to be integrally movable. The movable iron core 34 is movable in the axial direction together with the drive shaft 4.

The fixed iron core 35 is disposed in the housing portion 33a so as to face the movable iron core 34 on the contact direction Z1 side of the movable iron core 34. The fixed iron core 35 is fixed to the yoke 37.

The biasing member 36 is, for example, a coil spring, and is disposed between the movable iron core 34 and the fixed iron core 35. The urging member 36 urges the movable iron core 34 in the separating direction Z2. Therefore, the biasing member 36 is disposed between the movable core 34 and the fixed core 35 in a compressed state.

The yoke 37 includes a first yoke 37a and a second yoke 37b. The first yoke 37 a has a plate shape, and is disposed between the bottom 11 a of the contact case 11 and the spool 33. The first yoke 37a overlaps the lower part of the cylindrical portion 11b in the left-right direction. The first yoke 37a is connected to the annular core 38. The second yoke 37b is substantially U-shaped, and has a bottom portion disposed below the spool 33. The upper ends of both sides of the second yoke 37b are connected to the first yoke 37a.

Next, the operation of the electromagnetic relay 100 will be described. FIG. 1 shows a state where no voltage is applied to the coil 32. When no voltage is applied to the coil 32, the movement of the movable iron core 34 in the separating direction Z2 is suppressed by the biasing member 36. Therefore, the first movable contact 26 and the second movable contact 27 are separated from the first fixed contact 16 and the second fixed contact 17.

FIG. 5 shows a state where a voltage is applied to the coil 32. When a voltage is applied to the coil 32 to excite it, the movable core 34 moves in the contact direction Z1 against the elastic force of the urging member 36 due to the electromagnetic force of the coil 32. With the movement of the movable core 34, the drive shaft 4 and the movable contact piece 20 move in the contact direction Z1, and the first movable contact 26 and the second movable contact 27 move to the first fixed contact 16 and the second fixed contact 17, respectively. Contact.

When the application of the voltage to the coil 32 is stopped, the movable iron core 34 moves in the separating direction Z2 by the elastic force of the urging member 36, and the first movable contact 26 and the second movable contact 27 And the second fixed contact 17 is opened.

Here, as shown in FIGS. 1 and 5, a pair of arc extinguishing permanent magnets 40 are provided in the contact case 11. The permanent magnet 40 generates a magnetic flux directed in the left-right direction at a position between the first fixed contact 16 and the first movable contact 26. When a current flows vertically between the first fixed contact 16 and the first movable contact 26, Lorentz force acts on the arc in the width direction of the movable contact piece 20, and the arc is extended to the arc extension wall 12a. . At this time, for example, if there is a step between the first fixed contact 16 and the first fixed terminal 14, the arc will stick to the step and the arc will be prevented from elongating.

However, in the electromagnetic relay 100 according to the present embodiment, no steps occur between the first fixed terminal 14 and the first fixed contact 16 and between the movable contact piece 20 and the first movable contact 26. For this reason, when an arc is generated, it is possible to prevent the arc from sticking between the first fixed terminal 14 and the first fixed contact 16 and between the movable contact piece 20 and the first movable contact 26. Thus, the arc can be extinguished quickly. Note that, even when arcs are generated between the second fixed contact 17 and the second movable contact 27 and between the movable contact piece 20 and the second movable contact 27, the same effects as described above can be obtained. .

Although the embodiment of the electromagnetic relay according to one aspect of the present invention has been described above, the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the invention. For example, the configuration of the electromagnetic drive device 5 may be changed. The shape or arrangement of the coil 32, the spool 33, the movable iron core 34, the urging member 36, or the yoke 37 may be changed. The shape or arrangement of the housing 2, the contact device 3, the contact case 11, and the contact cover 12 may be changed.

FIG. 6 is a view of the periphery of the first fixed contact 16 according to the first modification viewed from the separation direction Z2 side. In the first modified example, in the first fixed terminal 14, the flat surface 14b is arranged in the direction in which the arc indicated by the arrow in FIG. Here, both ends of the first fixed contact 16 in the width direction of the first fixed terminal 14 are connected to the flat surface 14b of the first fixed terminal 14 without any step. The step portion 14c of the first fixed terminal 14 is formed in a substantially U-shape in plan view, and an end of the drive shaft 4 closer to the axis Ax is open toward the axis Ax of the drive shaft 4.

接触 The contact piece main body 21 of the movable contact piece 20 includes a protrusion 21e. The protrusion 21e protrudes in the longitudinal direction at the first end 21a and the second end 21b of the contact piece main body 21. In the width direction of the movable contact piece 20, the size of the protrusion 21 e is smaller than the other parts of the contact piece main body 21 and the size of the first fixed contact 16. The step 23a is formed on the contact direction Z1 side of the protrusion 21e, and the first movable contact 26 is arranged on the step 23a so as to be flush with the flat surface 22a. The first movable contact 26 entirely overlaps the step portion 23a and the convex portion 21e in a plan view. Therefore, the dimension of the first movable contact 26 in the width direction of the movable contact piece 20 is smaller than the dimension of the first fixed contact 16. Thereby, when the first movable contact 26 contacts the first fixed contact 16, it is possible to prevent the movable contact piece 20 from contacting the first fixed terminal 14.

By arranging the flat surface 14b in the direction in which the arc is extended with respect to the first fixed contact 16, for example, when the arc is extended toward the arc extension wall 12a, the arc is extended from the flat surface 14b to the arc extension wall. Stretched to 12a. For this reason, compared with the case where only the first fixed contact 16 is arranged in the direction in which the arc is extended, the consumption of the first fixed contact 16 due to the arc can be suppressed. The second fixed contact 17, the movable contact piece 20, and the second movable contact 27 are symmetrical with respect to the first fixed contact 16 with respect to the axis Ax of the drive shaft 4.

FIG. 7 is a view of the periphery of the first fixed contact 16 according to the second modification viewed from the separation direction Z2 side. The second modification is an embodiment in which the shapes of the first fixed contact 16 and the first movable contact 26 in the first modification are exchanged with each other. Specifically, in the movable contact piece 20, the flat surface 22a is arranged in the direction in which the arc is extended with respect to the first movable contact 26. Here, both ends of the first movable contact 26 in the width direction of the movable contact piece 20 are connected to the flat surface 22a of the movable contact piece 20 without any step. The step portion 23a of the movable contact piece 20 is formed in a substantially U-shape in plan view, and an end of the drive shaft 4 remote from the axis Ax is opened in a direction away from the axis Ax of the drive shaft 4.

端子 The terminal main body 14a of the first fixed terminal 14 includes a protrusion 14h. The protrusion 14h protrudes at one end of the terminal body 14a in a direction approaching the axis Ax of the drive shaft 4. In the width direction of the first fixed terminal 14, the size of the protrusion 14h is smaller than the size of the other part of the terminal body 14a and the size of the first movable contact 26. The step portion 14c is formed on the contact direction Z1 side of the convex portion 14h, and the first fixed contact 16 is arranged on the step portion 14c so as to be flush with the flat surface 14b. The first fixed contact 16 entirely overlaps the step portion 14c and the convex portion 14h in a plan view. Therefore, in the width direction of the movable contact piece 20, the dimension of the first fixed contact 16 is smaller than the dimension of the first movable contact 26. In this case, the consumption of the first movable contact 26 due to the arc can be suppressed as compared with the case where only the first movable contact 26 is arranged in the direction in which the arc is extended.

FIG. 8 is an enlarged schematic diagram around the movable contact piece 120 according to the third modification. In the third modification, the contact direction Z1 and the separation direction Z2 are opposite to those in the above embodiment. Each of the first fixed terminal 114 and the second fixed terminal 115 is a substantially cylindrical terminal extending in the axial direction. The first fixed contact 116 is connected to the first fixed terminal 114. The first fixed contact 116 does not overlap with the flat surface 122a of the movable contact piece 120 in plan view. The second fixed contact 117 is connected to the second fixed terminal 115. The second fixed contact 117 does not overlap with the flat surface 122b of the movable contact piece 120 in plan view.

接触 In the contact piece main body 121 of the movable contact piece 120, the first end 121a faces part of the first fixed contact 116, and the second end 121b faces part of the second fixed contact 117.

The first movable contact 126 is arranged on the step 123a of the movable contact piece 120 so as to be flush with the flat surface 120a. The step portion 123a is formed to be recessed from the flat surface 122a and extends to the first end portion 121a of the contact piece main body 21. The second movable contact 127 is arranged on the step portion 123b of the movable contact piece 120 so as to be flush with the flat surface 120b. Note that, similarly to the above-described embodiment, the first fixed terminal 114 and the second fixed terminal 115 are provided with a flat surface and a step, respectively, so that the first fixed contact 116 and the second fixed contact 117 are flush with the flat surface. It may be arranged on the step so that

4 Drive shaft 5 Electromagnetic drive 14 First fixed terminal (an example of fixed terminal)
14a Terminal body 14b Flat surface (an example of a second flat surface)
14c Step (an example of the second step)
15 Second fixed terminal 15a Terminal body 15b Flat surface (an example of a second flat surface)
15c Step 16 First fixed contact 17 Second fixed contact 20 Movable contact piece 21 Contact piece main body 22a Flat surface (an example of a first flat surface)
22b Flat surface (an example of a first flat surface)
23a Step (an example of a first step)
23b Step (an example of a first step)
26 First movable contact 27 Second movable contact 100 Electromagnetic relay Z1 Contact direction Z2 Separation direction Ax Axis

Claims

Fixed terminals,
A fixed contact arranged on the fixed terminal,
A contact piece main body having one end facing a part of the fixed contact, a first flat surface formed on one end side of the contact piece main body and not overlapping with the fixed contact in plan view, and formed concavely from the first flat surface; A movable contact piece comprising: a first step portion extending to one end of the contact piece main body;
A movable contact arranged on the first step portion of the movable contact piece so as to be flush with the first flat surface, and capable of contacting the fixed contact;
A drive shaft connected to the movable contact piece so as to be integrally movable,
An electromagnetic drive device that moves the drive shaft in a contact direction in which the fixed contact and the movable contact make contact with each other, and in a separation direction in which the fixed contact and the movable contact are separated.
With
Electromagnetic relay.
The first flat surface of the movable contact piece does not overlap with the fixed terminal in a plan view,
The electromagnetic relay according to claim 1.
In the fixed contact, an end closer to the axis of the drive shaft overlaps with the movable contact in a plan view, and an end farther from the axis of the drive shaft does not overlap with the movable contact,
In the movable contact, an end farther from the axis of the drive shaft overlaps with the fixed contact in plan view, and an end closer to the drive shaft with respect to the axis does not overlap with the movable contact.
The electromagnetic relay according to claim 1.
The fixed terminal has a terminal body having one end facing a part of the movable contact, a second flat surface parallel to the first flat surface of the movable contact piece and not overlapping the movable contact in plan view, A second step formed to be concave from a second flat surface and extending to one end of the terminal body.
The fixed contact is disposed on the second step portion of the fixed contact so as to be flush with the second flat surface,
The electromagnetic relay according to claim 1.
The second flat surface of the fixed terminal does not overlap with the movable contact piece in a plan view,
An electromagnetic relay according to claim 4.
The first flat surface of the movable contact piece is disposed in a direction in which an arc is extended with respect to the movable contact,
The electromagnetic relay according to claim 1, wherein a dimension of the fixed contact is smaller than a dimension of the movable contact in a width direction of the movable contact piece.
The second flat surface of the fixed terminal is disposed in a direction in which an arc is extended with respect to the fixed contact,
In the width direction of the movable contact piece, the dimension of the movable contact is smaller than the dimension of the fixed contact,
The electromagnetic relay according to claim 4.
The first step portion of the movable contact piece is rectangular in plan view, and is formed over the entire length of the movable contact piece in the width direction,
The second step portion of the fixed terminal is rectangular in a plan view, and is formed over the entire length of the fixed terminal in the width direction.
The electromagnetic relay according to claim 4.