JP6624384B2 - Electromagnetic relay - Google Patents

Description

  The present invention generally relates to an electromagnetic relay, and more particularly, to an electromagnetic relay that opens and closes contacts using magnetic attraction generated by energizing a coil.

  2. Description of the Related Art Conventionally, a relay (electromagnetic relay) such as a latching relay has been known, and is disclosed in, for example, Patent Document 1. In the relay described in Patent Literature 1, when the coil is excited, the armature is rotated by magnetic attraction generated between the attracting portion of the stator and the attracting piece of the armature, and the driving piece of the armature is contacted. By pressing the spring (movable element), the movable contact comes into contact with the fixed contact and the contact closes. Further, in the relay described in Patent Document 1, when the coil is excited in the reverse direction, the armature returns to the original state, the movable contact is separated from the fixed contact, and the contact is opened.

JP 2006-278057 A

  However, in the above-described conventional example, since the armature directly presses the mover, there is a problem that the mover may be shaved by the armature and abrasion powder may be generated.

  The present invention has been made in view of the above points, and has as its object to provide an electromagnetic relay capable of suppressing generation of wear powder.

  An electromagnetic relay according to a first aspect of the present invention includes a fixed contact, a movable contact that moves between a closed position that contacts the fixed contact, and an open position that is separated from the fixed contact, and a first end in one direction. A movable element for moving the movable contact between the closed position and the open position with a second end opposite to the first end as a fulcrum; a coil; An armature that drives the mover by a magnetic flux generated by energization, and a transmission spring that is provided between the armature and the mover and that transmits a force between the armature and the mover. The transmission spring is characterized in that the hardness of a portion in contact with the armature is higher than the hardness of the mover.

  In the electromagnetic relay according to the second aspect of the present invention, in the first aspect, the armature is opposed to the transmission spring, and includes a protrusion that contacts the transmission spring in a state where the movable contact is in the closed position. Preferably, the protrusion has a spherical surface in contact with the transmission spring.

  An electromagnetic relay according to a third aspect of the present invention is the electromagnetic relay according to the second aspect, wherein the transmission spring is configured such that hardness of a portion that contacts the armature is equal to hardness of the protrusion. Is preferred.

  In the electromagnetic relay according to a fourth aspect of the present invention, in the first or second aspect, it is preferable that an electroless nickel plating film is formed on a surface of the armature facing the transmission spring.

  An electromagnetic relay according to a fifth aspect of the present invention is the electromagnetic relay according to any one of the first to fourth aspects, wherein the transmission spring has a portion that contacts the armature when the movable contact is in the closed position. It is preferable that a gap is provided between the movable element and the movable element.

  The present invention is configured such that the transmission spring contacts the armature instead of the mover. Further, according to the present invention, since the hardness of the portion of the transmission spring that comes into contact with the armature is greater than the hardness of the mover, the generation of wear powder is suppressed as compared with the case where the mover contacts the armature. Can be.

FIG. 1 is a sectional view of the electromagnetic relay according to the embodiment of the present invention. FIG. 2A is a cross-sectional view showing a part of the electromagnetic relay, and showing an ON state of the contact device. FIG. 2B is a cross-sectional view showing a part of the electromagnetic relay of the above and showing an off state of the contact device. FIG. 3 is an exploded perspective view of the electromagnetic relay. FIG. 4 is a perspective view of a part of the armature in the electromagnetic relay of the above. FIG. 5A is a perspective view of a transmission spring in the electromagnetic relay according to the first embodiment. FIG. 5B is a perspective view of the mover to which the transmission spring is attached in the electromagnetic relay of the above.

  As shown in FIGS. 1 to 3, the electromagnetic relay 100 according to the embodiment of the present invention includes a fixed contact 13, a movable contact 14, a movable element 15, a coil 2, an armature 6, a transmission spring 8, It has. The movable contact 14 moves between a closed position in contact with the fixed contact 13 and an open position away from the fixed contact 13. The movable element 15 is provided with a movable contact 14 at a first end 153 in one direction, and moves the movable contact 14 between a closed position and an open position with a second end 154 opposite to the first end 153 as a fulcrum. Let it. The armature 6 drives the mover 15 by a magnetic flux generated by energization of the coil 2.

  The transmission spring 8 is provided between the armature 6 and the mover 15, and transmits a force between the armature 6 and the mover 15. Then, the transmission spring 8 is configured such that the hardness of a portion that comes into contact with the armature 6 is higher than the hardness of the mover 15.

  Hereinafter, the electromagnetic relay 100 according to the present embodiment will be described in detail. However, the configuration described below is merely an example of the present invention, and the present invention is not limited to the following embodiment, and departs from the technical idea of the present invention even in other embodiments. Various changes can be made in accordance with the design and the like as long as the change is not performed.

  In addition, hereinafter, in FIG. 1, the direction in which the fixed contact 13 and the movable contact 14 are arranged will be referred to as the up-down direction, the movable contact 14 side as viewed from the fixed contact 13 will be described as upper, and the reverse will be described as lower. In addition, in the following, in FIG. 1, the direction in which the first terminal plate 11 and the second terminal plate 12 (described later) are arranged is referred to as the left-right direction, and the second terminal plate 12 side as viewed from the first terminal plate 11 is rightward. The opposite will be described on the left.

  1 and 3 show arrows indicating these directions (up, down, left, right). However, these arrows are merely described for the purpose of assisting the explanation, and Not accompanied. Further, the definition of the direction is not intended to limit the usage mode of the electromagnetic relay 100 of the present embodiment.

  In the present embodiment, an example in which the electromagnetic relay 100 is mounted on an automobile having an idling stop function will be described. In the present embodiment, the electromagnetic relay 100 is connected and used so as to insert a contact device A1 (described later) into a supply path of DC power from a running battery to a load (for example, an LED lamp or an inverter). Let's take an example. For this reason, in the electromagnetic relay 100 of this embodiment, the state of supply of DC power from the battery to the load can be switched by opening and closing the contact device A1.

  The electromagnetic relay 100 of the present embodiment is a so-called hinge-type relay. As shown in FIGS. 1 and 3, the electromagnetic relay 100 of the present embodiment includes a contact device A1, a driving device B1, and a case C1.

  The contact device A1 includes a pair of terminal plates 1, a pair of fixed contacts 13, a pair of movable contacts 14, and a movable element 15, as shown in FIGS. Hereinafter, the left terminal plate 1 of the pair of terminal plates 1 is referred to as a “first terminal plate 11”, and the right terminal plate 1 is referred to as a “second terminal plate 12”.

  The first terminal plate 11 is formed of a conductive material (for example, copper (Cu)) in a flat plate shape that is long in the left-right direction. As shown in FIG. 3, a pair of mounting holes 111 penetrating in the thickness direction (vertical direction) is provided at an intermediate portion in the longitudinal direction (left-right direction) of the first terminal plate 11. The shaft portions 131 of the pair of fixed contacts 13 are inserted into the pair of mounting holes 111, respectively. Then, the pair of fixed contacts 13 is attached to the first terminal plate 11 by caulking each shaft portion 131 to the first terminal plate 11. Note that the pair of fixed contacts 13 may be formed integrally with the first terminal plate 11.

  The second terminal plate 12 is formed of a conductive material (for example, copper (Cu)) in a flat plate shape that is long in the left-right direction. A pair of fixing holes 121 penetrating in the thickness direction (vertical direction) is provided at an intermediate portion in the longitudinal direction (left-right direction) of the second terminal plate 12. The pair of fixing holes 121 are used for fixing the mover 15 to the second terminal plate 12.

  The first terminal plate 11 and the second terminal plate 12 have a first terminal portion 112 and a second terminal portion 122, respectively. The first terminal portion 112 is formed in a rectangular plate shape, and protrudes upward from one end (left end) in the longitudinal direction of the first terminal plate 11. The second terminal portion 122 is formed in a rectangular plate shape, and protrudes upward from one end (right end) of the second terminal plate 12 in the longitudinal direction. The first terminal portion 112 and the second terminal portion 122 are provided with a first terminal hole 113 and a second terminal hole 123 into which screws and the like are inserted, respectively. The first terminal portion 112 and the second terminal portion 122 are electrically connected to an electric path connecting the battery and the load, for example, by screwing.

  The mover 15 is formed from a conductive material (for example, copper (Cu)) in a plate shape long in the left-right direction. In the present embodiment, the mover 15 is configured by stacking a plurality of (here, three) leaf springs in the vertical direction. A first end (left end) 153 in the longitudinal direction of the mover 15 is provided with a pair of mounting holes 152 penetrating in the thickness direction (vertical direction). The shaft portions 141 of the pair of movable contacts 14 are inserted into the pair of mounting holes 152, respectively. The pair of movable contacts 14 are attached to the mover 15 by caulking each shaft portion 141 to the mover 15. That is, a pair of movable contacts 14 is provided at a first end (left end) 153 in one direction (longitudinal direction) of the mover 15. Note that the pair of movable contacts 14 may be formed integrally with the mover 15.

  The second end (right end) 154 of the mover 15 in the longitudinal direction is provided with a pair of fixing holes 151 penetrating in the thickness direction (vertical direction). The second end 154 of the mover 15 is fixed to the second terminal plate 12. Specifically, the pair of fixing holes 151 of the mover 15 are overlapped with the pair of fixing holes 121 of the second terminal plate 12, and pins are inserted into these fixing holes 151 and 121 and caulked, whereby the mover 15 is moved. 15 is fixed to the second terminal plate 12.

  The mover 15 is bent at the second end (right end) 154 side in the longitudinal direction so that the first end (left end) 153 in the longitudinal direction faces the first terminal plate 11 with an interval in the vertical direction. It is configured. Therefore, the pair of movable contacts 14 of the mover 15 are opposed to the pair of fixed contacts 13 of the first terminal plate 11 in the vertical direction.

  The mover 15 is driven by the driving device B1 to move the pair of movable contacts 14 between the closed position and the open position with the second end (right end) 154 opposite to the first end (left end) 153 as a fulcrum. To move between. Here, the closed position is a position where the pair of movable contacts 14 comes into contact with the pair of fixed contacts 13 (see FIG. 2A). The open position is a position where the pair of movable contacts 14 are separated from the pair of fixed contacts 13 (see FIG. 2B).

  When the pair of movable contacts 14 are in the closed position, that is, in the ON state of the contact device A1, the first terminal plate 11 and the second terminal plate 12 are short-circuited via the movable element 15. Therefore, when the contact device A1 is in the ON state, conduction is provided between the first terminal plate 11 and the second terminal plate 12, and DC power is supplied from the battery to the load. When the pair of movable contacts 14 are in the open position, that is, in the OFF state of the contact device A1, the space between the first terminal plate 11 and the second terminal plate 12 is opened, so that DC power is not supplied from the battery to the load. .

  1 and 3, the drive device B1 includes a coil 2, a bobbin 3, a stator 4, a yoke 5, an armature 6, a return spring 7, and a transmission spring 8. I have. The stator 4, the yoke 5, and the armature 6 are all made of a magnetic material.

  The coil 2 is configured by winding an electric wire (for example, a copper wire) around the outer peripheral surface of the bobbin 3. The coil 2 has a pair of coil terminals 21 to each of which a first end and a second end of the electric wire are electrically connected. The coil 2 is energized by receiving a current through a pair of coil terminals 21 to generate a magnetic flux. The bobbin 3 is formed in a cylindrical shape from a material having electrical insulation such as a synthetic resin material. The bobbin 3 is arranged so that its axial direction coincides with the left-right direction.

  The stator 4 is an iron core formed in a long column shape in the left-right direction. The stator 4 is inserted into the hollow portion 31 of the bobbin 3 such that both ends in the longitudinal direction (left-right direction) are exposed from the bobbin 3. The first end (right end) in the longitudinal direction of the stator 4 has a larger diameter dimension than the intermediate portion, and faces the armature 6. Hereinafter, the first end of the stator 4 is referred to as a “suction unit 41”. The second end (left end) in the longitudinal direction of the stator 4 has a smaller diameter than the intermediate portion, and is fixed to a first plate 51 (described later) of the yoke 5.

  The yoke 5, together with the stator 4 and the armature 6, forms a magnetic path through which a magnetic flux generated when the coil 2 is energized passes. The yoke 5 is formed such that the middle part of a rectangular plate that is long in the left-right direction is bent so that the cross-section becomes L-shaped. The yoke 5 has a first plate 51 and a second plate 52. Each of the first plate 51 and the second plate 52 is formed in a rectangular plate shape. The first plate 51 is provided on one end side (left side) of the coil 2 in the axial direction (left-right direction). The first plate 51 is provided with an insertion hole 511 that penetrates in the thickness direction (left-right direction). The second end of the stator 4 is inserted into the insertion hole 511. The second plate 52 is provided below the coil 2.

  The armature 6 is formed such that its cross section is L-shaped by bending an intermediate portion 63 of a rectangular plate that is long in the left-right direction. The armature 6 has a first plate 61 and a second plate 62. Each of the first plate 61 and the second plate 62 is formed in a rectangular plate shape. Further, the dimension of the first plate 61 in the width direction is smaller than the dimension of the second plate 62 in the width direction. Here, the width direction is a direction substantially orthogonal to both the up-down direction and the left-right direction.

  The first plate 61 of the armature 6 has a protrusion 611 as shown in FIGS. The protrusion 611 protrudes downward from one surface (lower surface) of the first plate 61 facing the mover 15. The protrusion 611 is formed integrally with the first plate 61. One surface of the protrusion 611 facing the mover 15 is formed in a spherical shape.

  The armature 6 has a first position where the second plate 62 contacts the suction portion 41 of the stator 4 and a second position where the second plate 62 separates from the suction portion 41 of the stator 4 with the intermediate portion 63 as a fulcrum. It is configured to be rotatable between. When the armature 6 is at the first position, the first plate 61 (here, the protrusion 611) of the armature 6 presses the mover 15 via the transmission spring 8. When the armature 6 is at the second position, the first plate 61 (here, the protrusion 611) of the armature 6 is pressed from the movable element 15 via the transmission spring 8.

  The return spring 7 is formed from a metal leaf spring so as to have an L-shaped cross section. The return spring 7 is formed by integrally forming a pair of a first piece 71 and a second piece 72. Each of the pair of first pieces 71 is fixed to the second plate 52 of the yoke 5. The second piece 72 is fixed to the second plate 62 of the armature 6. The return spring 7 is configured to bend when the armature 6 is at the first position. Then, the return spring 7 acts on the armature 6 in a direction to move the armature 6 from the first position to the second position by trying to return to the original state. That is, the return spring 7 is configured to apply a force to the armature 6 in a direction of moving the armature 6 from the first position to the second position by the elastic force.

  The transmission spring 8 is provided between the armature 6 and the mover 15, and transmits a force between the armature 6 and the mover 15. That is, in the present embodiment, a force is transmitted from the armature 6 to the movable element 15 via the transmission spring 8, and a force is transmitted from the movable element 15 to the armature 6 via the transmission spring 8.

  As shown in FIGS. 5A and 5B, the transmission spring 8 is formed in a U-shape in plan view from a metal leaf spring such as stainless steel (SUS). In particular, the transmission spring 8 is formed of a material having a higher hardness than the mover 15. As a specific example, when the transmission spring 8 is formed of stainless steel, the hardness of the transmission spring 8 is, for example, about 400 to 500 [HV] when expressed in Vickers hardness. The transmission spring 8 is formed by integrally forming a pair of mounting pieces 81 and a connecting piece 82. Each of the pair of mounting pieces 81 and the connecting piece 82 is formed in a rectangular shape.

  Each of the pair of mounting pieces 81 is provided with a hole 811 that penetrates in the thickness direction (vertical direction). In the present embodiment, a pair of mounting pieces 81 are mounted on the mover 15 by inserting and caulking the shaft portions 141 of the pair of movable contacts 14 into the holes 811 respectively. Note that the pair of mounting pieces 81 need not be mounted together with the pair of movable contacts 14. That is, the transmission spring 8 may be attached to a portion of the mover 15 that is different from the portion to which the pair of movable contacts 14 is attached.

  The connecting piece 82 connects the ends of the pair of mounting pieces 81 in the longitudinal direction. Here, the connecting piece 82 is bent upward along a connecting portion 83 with each of the pair of mounting pieces 81. Therefore, the connecting piece 82 can bend with the connecting portion 83 as a fulcrum. The connecting piece 82 faces the first plate 61 of the armature 6 with the pair of mounting pieces 81 attached to the mover 15. The connecting piece 82 is in contact with the protrusion 611 of the armature 6.

  The case C1 is formed of an electrically insulating material such as a ceramic or a synthetic resin, or stainless steel (SUS). The case C1 is configured by joining the base C11 and the cover C12 by, for example, welding, brazing, bonding using a thermosetting resin adhesive, or the like. The case C1 houses the contact device A1 and the driving device B1. In addition, as shown in FIG. 1, the first terminal portion 112 of the first terminal plate 11 and the second terminal portion 122 of the second terminal plate 12 of the contact device A1 are exposed from the case C1. Further, as shown in FIG. 1, a part of each of the pair of coil terminals 21 of the driving device B1 is exposed from the case C1.

  Hereinafter, the operation of the electromagnetic relay 100 of the present embodiment will be described with reference to FIGS. 2A and 2B. In the following description, the state of the mover 15 in the off state of the contact device A1 is referred to as an “original state”. When the coil 2 is energized in the off state of the contact device A1, the coil 2 generates a magnetic flux. Then, a magnetic attraction force is generated between the second plate 62 of the armature 6 and the suction portion 41 of the stator 4, whereby the second plate 62 is drawn toward the suction portion 41 against the elastic force of the return spring 7. Can be Thereby, the armature 6 rotates counterclockwise and moves from the second position to the first position.

  As the armature 6 moves to the first position, the first plate 61 (here, the protrusion 611) of the armature 6 pushes the connecting piece 82 of the transmission spring 8. Then, the transmission spring 8 transmits a force from the armature 6 to the mover 15. The mover 15 rotates counterclockwise around the second end (right end) 154 as a fulcrum by being pushed downward by receiving a force from the transmission spring 8. Then, the pair of movable contacts 14 move to the closed position where they contact the pair of fixed contacts 13 (see FIG. 2A). Therefore, the contact device A1 is turned on, and conduction between the first terminal plate 11 and the second terminal plate 12 is established.

  Next, when the energization of the coil 2 is released, the coil 2 stops generating magnetic flux. Then, the magnetic attraction between the second plate 62 of the armature 6 and the attraction portion 41 of the stator 4 is also lost. Then, the armature 6 rotates clockwise by the elastic force of the return spring 7 and moves from the first position to the second position.

  As the armature 6 moves to the second position, the force with which the first plate 61 of the armature 6 pushes the mover 15 via the transmission spring 8 decreases. Therefore, the mover 15 rotates clockwise around the second end (right end) 154 as a fulcrum due to its own elastic force. Then, the pair of movable contacts 14 move to an open position apart from the pair of fixed contacts 13 (see FIG. 2B).

  When the armature 6 returns to the second position and the movement of the armature 6 is completed, the armature 6 is fixed at the second position. Therefore, the connecting piece 82 of the transmission spring 8 is elastically deformed by being sandwiched between the first plate 61 of the armature 6 and the movable element 15. That is, the transmission spring 8 contacts the armature 6 (here, the protrusion 611) in an elastically deformed state in a state where the pair of movable contacts 14 are at the open position.

  Then, the elastic force for returning the connecting piece 82 of the transmission spring 8 to the original state acts on the movable element 15, so that the movable element 15 is decelerated. Therefore, the vibration of the mover 15 is suppressed by the transmission spring 8 and converges, and the movement of the mover 15 is completed.

  As described above, the electromagnetic relay 100 of the present embodiment includes the transmission spring 8 that is provided between the armature 6 and the mover 15 and that transmits a force between the armature 6 and the mover 15. . Therefore, in the electromagnetic relay 100 of the present embodiment, the generation of wear powder due to the friction between the mover 15 and the armature 6 is prevented by bringing the transmission spring 8 into contact with the armature 6 instead of the mover 15. Can be.

  Further, in the electromagnetic relay 100 of the present embodiment, the transmission spring 8 is formed of, for example, stainless steel, and has a higher hardness than the mover 15 formed of, for example, copper. That is, the hardness of the portion (here, the connecting piece 82) of the transmission spring 8 that comes into contact with the armature 6 (here, the protrusion 611) is larger than the hardness of the mover 15. As described above, in the electromagnetic relay 100 of the present embodiment, the hardness of the transmission spring 8 is set to be closer to the hardness of the armature 6 by making the hardness of the transmission spring 8 larger than the hardness of the mover 15. For this reason, in the electromagnetic relay 100 of the present embodiment, the transmission spring 8 is less likely to be shaved by the armature 6 and less wear powder is generated than when the mover 15 contacts the armature 6.

  As a result, the electromagnetic relay 100 of the present embodiment can suppress the generation of wear powder. Therefore, in the electromagnetic relay 100 of the present embodiment, there is a case where the on / off operation of the contact device A1 is affected, for example, abrasion powder is sandwiched between the pair of movable contacts 14 and the pair of fixed contacts 13. Unlikely to happen.

  Here, as means for suppressing the generation of abrasion powder, for example, it is conceivable to make the hardness of the mover 15 close to the hardness of the armature 6 without providing the transmission spring 8. However, with this means, the hardness must be increased while securing the elasticity and conductivity required by the mover 15, and it is difficult to design the mover 15. On the other hand, in the electromagnetic relay 100 of the present embodiment, it is possible to suppress the generation of abrasion powder without changing the design of the mover 15.

  Further, as another means for suppressing the generation of abrasion powder, for example, it is conceivable to apply lubricating oil to a portion where the mover 15 and the armature 6 come into contact with each other without providing the transmission spring 8. However, this method has a problem that the number of steps is increased because a step of applying a lubricating oil is required. In addition, this means has a problem in that the gas generated from the lubricating oil may affect the durability of the electromagnetic relay 100. On the other hand, in the electromagnetic relay 100 of the present embodiment, it is possible to suppress the generation of wear powder without causing the above problem.

  Here, the hardness of the transmission spring 8 may be greater than the hardness of the mover 15, but is preferably closer to the hardness of the armature 6. In other words, if the hardness of the transmission spring 8 is close to the hardness of the armature 6, the friction between the transmission spring 8 and the armature 6 makes it difficult for the transmission spring 8 or the armature 6 to be scraped, so that the wear powder is more effectively removed. It is possible to suppress the occurrence. For example, the hardness of the transmission spring 8 is preferably equal to the hardness of the armature 6. This configuration can be realized, for example, by forming the transmission spring 8 from a material having the same hardness as the armature 6.

  Moreover, in the electromagnetic relay 100 of the present embodiment, the armature 6 includes the protrusion 611. The protrusion 611 faces the transmission spring 8 (here, the connecting piece 82), and comes into contact with the transmission spring 8 in a state where the pair of movable contacts 14 are in the closed position. The projection 611 has a spherical surface in contact with the transmission spring 8. In this configuration, since the contact area of the transmission spring 8 with the armature 6 can be reduced, the friction of the transmission spring 8 with the armature 6 can be reduced. Further, in this configuration, when the transmission spring 8 comes into contact with the projection 611, the transmission spring 8 moves along the spherical surface of the projection 611, so that friction hardly occurs. As a result, in this configuration, generation of wear powder from the transmission spring 8 can be more effectively suppressed. In addition, whether or not to adopt the configuration is optional.

  In addition, in the electromagnetic relay 100 of the present embodiment, the transmission spring 8 is configured such that the hardness of the portion (here, the connecting piece 82) that comes into contact with the armature 6 is equal to the hardness of the protrusion 611. Is preferred. In this configuration, the transmission spring 8 is hardly shaved due to the friction between the transmission spring 8 and the protrusion 611, so that generation of wear powder from the transmission spring 8 can be more effectively suppressed.

  In the electromagnetic relay 100 of the present embodiment, it is preferable that an electroless nickel plating film is formed on a surface of the armature 6 facing the transmission spring 8 (here, the surface of the protrusion 611). The electroless nickel plating film is formed by, for example, performing an electroless Ni-P (nickel-phosphorus) plating process on the protrusion 611 and performing a heat treatment. With this configuration, as compared with the case of forming an electrolytic nickel plating film, the film is hardly peeled off, and abrasion powder is hardly generated. The hardness of the film formed on the surface of the protrusion 611 is lower when the electroless nickel plating film is formed than when the electroless nickel plating film is formed. It is considered that it depends not only on the large size but also on the adhesion of the film to the base and the fine surface condition.

  Further, in the electromagnetic relay 100 of the present embodiment, the transmission spring 8 has a gap D1 (see FIG. 2A) between the movable element 15 and a portion that contacts the armature 6 when the pair of movable contacts 14 are in the closed position. ) Is provided. That is, the transmission spring 8 has such an elasticity that a gap D1 is generated even when the transmission spring 8 is sandwiched between the movable element 15 and the armature 6 in a state where the pair of movable contacts 14 are in the closed position. In this configuration, since the transmission spring 8 does not contact the mover 15, the generation of wear powder due to friction between the transmission spring 8 and the mover 15 can be suppressed. In addition, whether or not to adopt the configuration is optional.

  By the way, in the present embodiment, the protrusion 611 is in contact with the transmission spring 8, but another configuration may be used. For example, the transmission spring 8 may be configured to directly contact the armature 6. In this case, the protrusion 611 of the armature 6 is unnecessary. In this case, similarly to the case where the electroless nickel plating film is formed on the surface of the protrusion 611, the electroless nickel plating film is formed on the surface (lower surface) of the armature 6 that contacts the transmission spring 8. Is also good.

  Further, in the present embodiment, a film is formed on the surface of the protrusion 611, but another configuration may be used. For example, when a film is not formed on the surface of the protrusion 611, the transmission spring 8 is configured such that the hardness of the portion (here, the connecting piece 82) that comes into contact with the protrusion 611 is close to the hardness of the protrusion 611. Is preferred.

  In the electromagnetic relay 100 of the present embodiment, the contact device A1 includes the pair of fixed contacts 13 and the pair of movable contacts 14, but may have another configuration. For example, the contact device A1 may include one fixed contact 13 and one movable contact 14. Further, the contact device A1 may include three or more fixed contacts 13 and three or more movable contacts 14.

  Further, the electromagnetic relay 100 of the present embodiment can be used for any of a contact relay, b contact relay, and c contact relay. For example, when the electromagnetic relay 100 is used as a c-contact relay, a fixed contact that contacts when the movable contact 14 is at the open position may be provided separately from the fixed contact 13. In this configuration, in accordance with the energization / de-energization of the coil 2, the electric path connected to the fixed contact 13 where the movable contact 14 contacts at the closed position, and the electric path connected to the fixed contact 13 where the movable contact 14 contacts at the open position. And can be switched.

DESCRIPTION OF SYMBOLS 13 Fixed contact 14 Movable contact 15 Mover 153 1st end 154 2nd end 2 Coil 6 Armature 611 Projection 8 Transmission spring 100 Electromagnetic relay D1 Gap

Claims (5)

Fixed contacts,
A closed position that contacts the fixed contact, and a movable contact that moves between an open position away from the fixed contact,
A movable element that is provided with the movable contact at a first end in one direction, and that moves the movable contact between the closed position and the open position with a second end opposite to the first end as a fulcrum;
Coils and
An armature that drives the mover by a magnetic flux generated by energizing the coil,
A transmission spring that is provided between the armature and the mover and that transmits a force between the armature and the mover,
An electromagnetic relay, wherein the transmission spring is configured such that hardness of a portion that contacts the armature is greater than hardness of the mover. The armature includes a protrusion that faces the transmission spring in a state in which the movable contact is opposed to the transmission spring and the movable contact is in the closed position.
The electromagnetic relay according to claim 1, wherein a surface of the protrusion that contacts the transmission spring is formed in a spherical shape.   3. The electromagnetic relay according to claim 2, wherein the transmission spring is configured such that hardness of a portion that contacts the armature is equal to hardness of the protrusion. 4.   The electromagnetic relay according to claim 1, wherein an electroless nickel plating film is formed on a surface of the armature facing the transmission spring.   The said transmission spring is comprised so that a space | gap may be provided between the said movable armature and the site | part which contacts the said armature, when the said movable contact is in the said closed position. The electromagnetic relay according to any one of claims 1 to 4.

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