Electromagnetic relay

Abstract

The electromagnetic relay includes a fixed contact, a movable contact piece, a drive shaft, an electromagnetic relay and a positioning portion. The movable contact piece includes a movable contact arranged opposite to the fixed contact, and can move in a first direction in contact with the fixed contact and in a second direction away from the fixed contact. The drive shaft is connected to the movable contact piece. The electromagnetic relay includes a movable iron core connected to the drive shaft in a manner that can move as a whole. The electromagnetic relay moves the drive shaft together with the movable iron core, switching between a contact state in which the movable contact contacts the fixed contact and a separation state in which the movable contact separates from the fixed contact. The positioning portion positions either the drive shaft or the movable iron core in the separation state. Either the drive shaft or the movable iron core includes a first inclined portion in contact with the positioning portion in the separation state.

Description

Technical Field

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

[0002] In the past, there is known an electromagnetic relay that opens and closes a circuit. The electromagnetic relay has a fixed contact, a movable contact, a drive shaft, and an electromagnetic drive device. The electromagnetic drive device includes a coil, a movable iron core connected to the drive shaft, and a force-applying component. The movable iron core can move between a working position and a disconnected position, and the force-applying component applies force toward the disconnected position side.

[0003] When voltage is applied to the coil, the movable iron core moves from the disconnected position to the working position against the elastic force of the force-applying member. As a result, the movable contact contacts the fixed contact via the drive shaft. On the other hand, when voltage is stopped from being applied to the coil, the movable iron core moves from the working position to the disconnected position due to the elastic force of the force-applying member. As a result, the movable contact separates from the fixed contact via the drive shaft.

[0004] Patent Document 1: Japanese Patent No. 5684650

[0005] Patent Document 2: Japanese Patent Application Publication No. 2016-201286 Summary of the invention

[0006] For example, in Patent Document 1, the movable iron core contacts the auxiliary yoke and is positioned in the disconnected position. Therefore, the movable iron core collides with the auxiliary yoke when it moves from the working position to the disconnected position. The portion where the movable iron core and the auxiliary yoke contact each other is formed by a flat surface orthogonal to the drive shaft, so when the movable shaft collides with the auxiliary yoke, a large impact force is generated in the axial direction. In the case where the impact force exceeds the elastic force of the force-applying member, there is a possibility of the following malfunction, that is, the movable iron core moves to the working position and the movable contact contacts the fixed contact.

[0007] In addition, Patent Document 1 discloses a structure in which magnets are arranged around a movable iron core and the vibration or impact of the movable iron core is absorbed by the attraction force of the magnets, but in this case, the manufacturing cost increases as the number of components increases. Similarly, Patent Document 2 discloses a structure in which a buffer rubber is used to absorb the vibration or impact of the movable iron core, but in this case, the manufacturing cost also increases as the number of components increases.

[0008] The present invention aims to improve the disconnection performance between the fixed contact and the movable contact. Another object of the present invention is to improve the disconnection performance between the fixed contact and the movable contact while suppressing an increase in manufacturing cost.

[0009] (1) An electromagnetic relay according to one embodiment of the present invention comprises a fixed contact, a movable contact piece, a drive shaft, an electromagnetic drive device and a positioning portion. The movable contact piece includes a movable contact arranged opposite to the fixed contact, and is movable in a first direction in contact with the fixed contact and in a second direction away from the fixed contact. The drive shaft is connected to the movable contact piece and is movable in the first direction and the second direction together with the movable contact piece. The electromagnetic drive device includes a movable iron core connected to the drive shaft in a manner that allows it to move as a whole, and moves the drive shaft together with the movable iron core, thereby switching between a contact state in which the movable contact contacts the fixed contact and a separation state in which the movable contact separates from the fixed contact. The positioning portion positions either the drive shaft or the movable iron core in the separation state. Either the drive shaft or the movable iron core includes a first inclined portion in contact with the positioning portion in the separation state.

[0010] In the electromagnetic relay, either the drive shaft or the movable iron core includes a first inclined portion that contacts the positioning portion in a separated state. For example, in the case where the movable iron core includes the first inclined portion, when the movable contact is switched from the contact state to the separated state, the movable iron core moves in the second direction, and the first inclined portion of the movable iron core collides with the positioning portion. Therefore, for example, compared with a case where the positioning portion and the first inclined portion collide with each other in a plane perpendicular to the drive shaft, the impact force generated in the axial direction can be suppressed. Therefore, when the movable iron core collides with the positioning portion, the occurrence of erroneous operation such as the movable iron core moving in the first direction and the movable contact contacting the fixed contact can be suppressed. That is, the improvement of the disconnection performance between the fixed contact and the movable contact can be achieved.

[0011] (2) Preferably, the first inclined portion is inclined toward the first direction side or the second direction side as it approaches the axis of the drive shaft. In this case, the first inclined portion can be realized with a simple structure.

[0012] (3) Preferably, the first inclined portion includes a curved surface portion formed in a curved shape. In this case, the impact force generated in the axial direction can be suppressed compared to a case where the positioning portion and the first inclined portion collide with each other in a plane perpendicular to the drive shaft.

[0013] (4) Preferably, the positioning portion includes a second inclined portion in contact with the first inclined portion. The first inclined portion and the second inclined portion are inclined toward the first direction side or the second direction side as they approach the axis of the drive shaft. In this case, since the second inclined portion of the positioning portion is in contact with the first inclined portion, the impact force generated in the axial direction can be suppressed compared to a case where the positioning portion and the first inclined portion collide with each other in a plane perpendicular to the drive shaft.

[0014] (5) Preferably, the device further comprises a contact housing for accommodating the fixed contact and the movable contact. The contact housing includes a cylindrical portion disposed opposite to the movable iron core. The positioning portion is formed in the cylindrical portion. The movable iron core includes a first inclined portion. In this case, the positioning portion can be formed integrally with the contact housing, thereby reducing manufacturing costs.

[0015] (6) Preferably, the electromagnetic drive device includes a bottomed cylindrical accommodating member for accommodating the movable iron core. The movable iron core includes a first inclined portion, which is arranged opposite to the bottom of the accommodating member. The positioning portion is formed at the bottom of the accommodating member. In this case, the positioning portion can be formed integrally with the accommodating member, thereby reducing manufacturing costs.

[0016] (7) Preferably, the contact housing is further provided to accommodate the fixed contact and the movable contact. The drive shaft includes a first inclined portion. The contact housing includes a cylindrical portion arranged opposite to the first inclined portion. The positioning portion is formed in the cylindrical portion. In this case, the positioning portion can be formed integrally with the contact housing, thereby reducing manufacturing costs.

[0017] (8) Preferably, the cover is further provided with a cover portion disposed at a position closer to the second direction side than the drive shaft. The positioning portion is disposed opposite to one end of the cover and the drive shaft. The drive shaft includes a first inclined portion. In this case, the positioning portion can be formed integrally with the cover portion, thereby controlling the manufacturing cost.

[0018] According to the present invention, the disconnection performance between the fixed contact and the movable contact can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A cross-sectional view of an electromagnetic relay according to an embodiment of the present invention.

[0020] Figure 2 This is a cross-sectional view of an electromagnetic relay when voltage is applied to the coil.

[0021] Figure 3 It is an enlarged cross-sectional view of the periphery of the movable iron core according to the first modification.

[0022] Figure 4 It is an enlarged cross-sectional view of the periphery of the movable iron core according to the first modification.

[0023] Figure 5 It is an enlarged cross-sectional view of the periphery of the movable iron core according to the second modification.

[0024] Figure 6 It is an enlarged cross-sectional view of the periphery of the movable iron core according to the third modification.

[0025] Figure 7 It is an enlarged cross-sectional view of the periphery of the cylindrical portion of the contact housing according to the fourth modified example.

[0026] Figure 8 It is an enlarged cross-sectional view of the periphery of the drive shaft of the fifth modified example.

[0027] Explanation of symbols

[0028] 2b: cover (an example of a cover part);

[0029] 4: driving shaft;

[0030] 4b: 1st inclined portion;

[0031] 5: Electromagnetic drive device;

[0032] 6: Positioning unit;

[0033] 6a: second inclined portion;

[0034] 11: contact housing;

[0035] 11b: barrel;

[0036] 14a: a first fixed contact (an example of a fixed contact);

[0037] 15a: second fixed contact (an example of a fixed contact);

[0038] 16: movable contact piece;

[0039] 16a: a first movable contact (an example of a movable contact);

[0040] 16b: a second movable contact (an example of a movable contact);

[0041] 34: movable iron core;

[0042] 34a: first inclined portion;

[0043] 34b: curved surface;

[0044] 40: accommodating components;

[0045] 100: electromagnetic relay;

[0046] Ax: axis of the drive shaft;

[0047] Z1: contact direction (an example of the first direction);

[0048] Z2: separation direction (an example of the second direction). DETAILED DESCRIPTION

[0049] 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 is a cross-sectional view of the electromagnetic relay 100. Figure 1As shown, the electromagnetic relay 100 includes a case 2 , a contact device 3 , a drive shaft 4 , an electromagnetic drive device 5 , and a positioning portion 6 .

[0050] In the following description, the direction in which the axis Ax of the drive shaft 4 extends is referred to as the "axial direction". Figure 1 The upper side is set as "upper", the lower side is set as "lower", the left side is set as "left", and the right side is set as "right" for explanation. In addition, in this embodiment, Figure 1 The lower part of the diagram is the contact direction Z1. Figure 1 The upward direction in the figure is the separation direction Z2. The details of the contact direction Z1 and the separation direction Z2 will be described later.

[0051] The shell 2 includes a shell 2a and a cover 2b. The shell 2a is a roughly quadrilateral box-shaped body, which is open at the top. The cover 2b covers the top of the shell 2a. The shell 2a and the cover 2b are formed of insulating materials. The contact device 3, the drive shaft 4 and the electromagnetic drive device 5 are accommodated inside the shell 2.

[0052] A contact housing 11 accommodating the contact device 3 and a contact cover 12 covering the upper side of the contact housing 11 are arranged in the housing 2. The contact housing 11 and the contact cover 12 are formed of a material having insulating properties.

[0053] The contact housing 11 includes a bottom 11a, a cylindrical portion 11b, a first contact support portion 11c, and a second contact support portion 11d. The bottom 11a is rectangular and plate-shaped. The length direction of the bottom 11a is Figure 1 The left and right directions in are consistent.

[0054] The barrel 11b extends in a cylindrical shape in the axial direction. The barrel 11b protrudes downward from the center of the bottom 11a, and protrudes upward from the center of the bottom 11a. The barrel 11b includes a through hole 18 that penetrates the bottom 11a in the axial direction. The through hole 18 penetrates the center of the bottom 11a in the axial direction. The through hole 18 allows the drive shaft 4 to penetrate in the axial direction. In addition, the barrel 11b does not necessarily have to be cylindrical.

[0055] The first contact support portion 11c is arranged 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 from the bottom 11a in a rectangular shape. The second contact support portion 11d is arranged on the right side of the center of the bottom 11a in the longitudinal direction. The second contact support portion 11d is formed to protrude upward from the bottom 11a in a rectangular shape.

[0056] The contact cover 12 covers the upper portion of the contact housing 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 ceramic material such as resin or alumina.

[0057] 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.

[0058] The first fixed terminal 14 extends in the left-right direction and is supported by the first contact support portion 11c of the contact housing 11 in the shell 2. 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 on the upper portion of the first contact support portion 11c in the contact housing 11. The first fixed contact 14a is an example of a fixed contact. The first external connection portion 14b protrudes from the housing 2a in the left-right direction.

[0059] The second fixed terminal 15 extends in the left-right direction and is supported by the second contact support portion 11d of the contact housing 11 in the shell 2. The second fixed terminal 15 includes a second fixed contact 15a and a second external connection portion 15b. Figure 1 As shown in FIG. 1 , the second fixed terminal 15 is bilaterally symmetrical with the first fixed terminal 14 across the axis Ax of the drive shaft 4, and thus description thereof is omitted. The second fixed contact 15a is an example of a fixed contact.

[0060] The movable contact piece 16 extends in the left-right direction in the contact housing 11. The movable contact piece 16 is arranged opposite to the first fixed terminal 14 and the second fixed terminal 15. The movable contact piece 16 is arranged above the first fixed contact 14a and the second fixed contact 15a. 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 to the first fixed contact 14a and can contact the first fixed contact 14a. The second movable contact 16b is arranged opposite to the second fixed contact 15a and can contact the second fixed contact 15a. The first movable contact 16a and the second movable contact 16b are examples of movable contacts.

[0061] The movable contact piece 16 is movable in a contact direction Z1 for contacting the first fixed contact 14 a and the second fixed contact 15 a and a separation direction Z2 for moving away from the first fixed contact 14 a and the second fixed contact 15 a .

[0062] The contact direction Z1 is a direction in which the first movable contact 16a and the second movable contact 16b come into contact with 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 are separated from the first fixed contact 14a and the second fixed contact 15a ( Figure 1 The contact direction Z1 and the separation direction Z2 are consistent with the axial direction.

[0063] 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 movable contact piece 16 is clamped in the axial direction by the upper portion of the bracket 24 and the flange portion 4a of the drive shaft 4. The contact spring 25 is arranged between the bottom of the bracket 24 and the flange portion 4a of the drive shaft 4, and applies force to the drive shaft 4 and the movable contact piece 16 toward the separation direction Z2 side.

[0064] 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 16 via the contact piece holding portion 17. The drive shaft 4 is movable together with the movable contact piece 16 in the contact direction Z1 and the separation direction Z2.

[0065] The electromagnetic drive device 5 moves the drive shaft 4 in the contact direction Z1 and the separation direction Z2. Thus, the electromagnetic drive device 5 switches between the contact state and the separation state. Figure 2 ) is a state in which the first movable contact 16a and the second movable contact 16b are in contact with the first fixed contact 14a and the second fixed contact 15a. Figure 1 ) is a state in which 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. The electromagnetic drive device 5 is arranged below the contact housing 11 in the case 2.

[0066] The electromagnetic drive device 5 includes a coil 32 , a bobbin 33 , a movable iron core 34 , a fixed iron core 35 , a biasing member 36 , and a yoke 37 .

[0067] The coil 32 is mounted on the outer periphery of the bobbin 33. The bobbin 33 includes a housing 33a. The housing 33a is provided on the inner periphery of the bobbin 33. The housing 33a is cylindrical and extends in the axial direction.

[0068] The movable iron core 34 is disposed in the housing 33a. The movable iron core 34 is disposed opposite to the cylindrical portion 11b of the contact housing 11. The movable iron core 34 is, for example, cylindrical, and the drive shaft 4 passes through the center in the axial direction, and is connected to the drive shaft 4 in a manner that allows it to move integrally. The movable iron core 34 can be Figure 1 The disconnect position shown is the same as Figure 2The movable iron core 34 moves in the axial direction together with the drive shaft 4 between the working positions shown. The movable iron core 34 is located in the disconnected position when in the separated state, and is located in the working position when in the contact state.

[0069] The movable iron core 34 includes a first inclined portion 34a. The first inclined portion 34a is formed on the surface of the movable iron core 34 on the separation direction Z2 side. The first inclined portion 34a is arranged opposite to the positioning portion 6 and can contact the positioning portion 6. The first inclined portion 34a is inclined toward the contact direction Z1 side as it approaches the axis Ax of the drive shaft 4.

[0070] In the accommodation portion 33a, the fixed iron core 35 is disposed facing the movable iron core 34 at a position closer to the contact direction Z1 side than the movable iron core 34. The fixed iron core 35 is fixed to the yoke 37.

[0071] The urging 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 separation direction Z2. Therefore, the urging member 36 is disposed between the movable iron core 34 and the fixed iron core 35 in a compressed state.

[0072] The yoke 37 includes a first yoke 37a and a second yoke 37b. The first yoke 37a is plate-shaped and is disposed between the bottom 11a of the contact housing 11 and the winding frame 33. The first yoke 37a overlaps the lower part of the cylinder 11b in the left-right direction. The first yoke 37a is connected to the annular core 38. The second yoke 37b is roughly U-shaped, and the bottom is disposed below the winding frame 33. The upper ends of both sides of the second yoke 37b are connected to the first yoke 37a.

[0073] The positioning portion 6 is disposed at the end portion of the cylindrical portion 11b of the contact housing 11 on the contact direction Z1 side. In the present embodiment, the positioning portion 6 positions the movable iron core 34 in the separated state. Figure 1 As shown, the positioning portion 6 contacts the movable iron core 34 in the separated state to position the movable iron core 34 at the disconnected position. That is, the positioning portion 6 prohibits the movable iron core 34 from moving to the separation direction Z2 side in the separated state.

[0074] The positioning portion 6 includes a second inclined portion 6a. The second inclined portion 6a is formed on the surface of the cylindrical portion 11b of the contact housing 11 on the contact direction Z1 side. The second inclined portion 6a has a shape corresponding to the first inclined portion 34a of the movable iron core 34. In detail, the second inclined portion 6a is inclined toward the contact direction Z1 side as it approaches the axis Ax of the drive shaft 4. That is, the second inclined portion 6a has a tapered shape whose front end becomes thinner as it approaches the axis Ax of the drive shaft 4. The second inclined portion 6a contacts the first inclined portion 34a of the movable iron core 34 in a separated state. Thereby, the movable iron core 34 is positioned in the disconnected position. In addition, as Figure 2As shown, when the movable iron core 34 is in the working position, the positioning portion 6 is in a state of being separated from the movable iron core 34 .

[0075] Next, the operation of electromagnetic relay 100 will be described. Figure 1 Indicates a state where no voltage is applied to the coil 32. When no voltage is applied to the coil 32, the movable iron core 34 is prevented from moving in the separation direction Z2 by the force applying member 36, so that the movable iron core 34 is located in the disconnected position. Therefore, 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.

[0076] Figure 2 Indicates the state of applying voltage to the coil 32. When voltage is applied to the coil 32 to excite it, the movable iron core 34 overcomes the elastic force of the force-applying member 36 and moves from the disconnected position to the working position by the electromagnetic force of the coil 32. As the movable iron core 34 moves to the working position, 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.

[0077] If the voltage applied to the coil 32 stops, the movable iron core 34 moves from the working position to the disconnected position due to the elastic force of the force applying member 36, and 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 movable iron core 34 moves from the working position to the disconnected position, it collides with the positioning portion 6 and generates an impact force in the axial direction. In the case where the collision force exceeds the elastic force of the force applying member 36, it is possible that the movable iron core 34 moves to the working position and the first movable contact 16a and the second movable contact 16b contact the first fixed contact 14a and the second fixed contact 15a.

[0078] In the present embodiment, the application of voltage to the coil 32 is stopped, and when the movable iron core 34 moves from the operating position to the disconnecting position, the first inclined portion 34a of the movable iron core 34 collides with the second inclined portion 6a of the positioning portion 6. Thus, since the impact force generated in the axial direction is vector-dispersed corresponding to the inclination angles of the first inclined portion 34a and the second inclined portion 6a, the impact force generated in the axial direction can be suppressed compared to the case where the movable iron core 34 and the positioning portion 6 collide with each other in a plane perpendicular to the drive shaft 4.

[0079] Therefore, when the movable iron core 34 collides with the positioning portion 6, it is possible to suppress the occurrence of erroneous operations such as the movable iron core 34 moving to the working position and the first movable contact 16a and the second movable contact 16b contacting the first fixed contact 14a and the second fixed contact 15a. As a result, the disconnection performance between the first fixed contact 14a and the first movable contact 16a can be improved, and the disconnection performance between the second fixed contact 15a and the second movable contact 16b can also be improved. In addition, the impact of the movable iron core 34 can be suppressed without using components such as magnets and buffer rubbers, so the manufacturing cost can also be controlled.

[0080] The above is a description of an embodiment of an electromagnetic relay according to one embodiment of the present invention, but the present invention is not limited to the above embodiment, and various changes can be made without departing from the main purpose of the invention. For example, the structure of the electromagnetic drive device 5 can also be changed. The shape or configuration of the coil 32, the winding frame 33, the movable iron core 34, the force member 36, or the yoke 37 can also be changed. The shape or configuration of the shell 2, the contact device 3, the contact housing 11, and the contact cover 12 can also be changed.

[0081] In particular, the shapes of the positioning portion 6 and the first inclined portion 34a of the movable iron core 34 are not limited to the above embodiment. The shapes of the positioning portion 6 and the first inclined portion 34a of the movable iron core 34 can be any shape as long as the impact force generated in the axial direction when the positioning portion 6 and the first inclined portion 34a collide with each other can be suppressed.

[0082] Figure 3 It is an enlarged cross-sectional view of the periphery of the movable iron core 34 according to the first modified example. Figure 3 Indicates the state when the movable iron core 34 is in the disconnected position. In the first variant, it is an embodiment in which the shapes of the first inclined portion 34a of the movable iron core 34 and the second inclined portion 6a of the positioning portion 6 are interchanged. The first inclined portion 34a of the movable iron core 34 is inclined toward the separation direction Z2 side as it approaches the axis Ax of the drive shaft 4. That is, the first inclined portion 34a of the movable iron core 34 has a tapered shape whose front end becomes thinner as it approaches the axis Ax of the drive shaft 4. The second inclined portion 6a of the positioning portion 6 is inclined toward the separation direction Z2 side as it approaches the axis Ax of the drive shaft 4. In addition, as Figure 4 As shown in FIG. 1 , the first inclined portion 34a may include a curved surface portion 34b formed in a curved surface shape. Similarly, the second inclined portion may also be formed in a curved surface shape.

[0083] Figure 5 It is an enlarged cross-sectional view of the periphery of the movable iron core 34 according to the second modified example. Figure 5Indicates the state when the movable iron core 34 is in the disconnected position. In the disconnected position. The first inclined portion 34a of the movable iron core 34 has the same shape as that of the above-mentioned embodiment. The surface on the contact direction Z1 side of the barrel 11b has a flat shape along the direction orthogonal to the drive shaft 4. The positioning portion 6 is the outer end 11e of the surface on the contact direction Z1 side of the barrel 11b. Therefore, the movable iron core 34 is positioned due to the line contact between the first inclined portion 34a of the movable iron core 34 and the outer end 11e. In addition, the first inclined portion 34a of the movable iron core 34 may also be a tapered shape whose front end becomes thinner as it approaches the axis Ax of the drive shaft 4 as in the first modified example. In this case, the first inclined portion 34a of the movable iron core 34 is in contact with the inner end 11f of the barrel 11b (refer to Figure 5 ) line contact and is positioned.

[0084] Figure 6 It is an enlarged cross-sectional view of the periphery of the movable iron core 34 according to the third modified example. Figure 6 Indicates the state when the movable iron core 34 is in the disconnected position. In the third variant, the contact direction Z1 and the separation direction Z2 are opposite to those in the above-mentioned embodiment. In addition, the movable iron core 34, the fixed iron core 35 and the force-applying member 36 are accommodated in a bottomed cylindrical accommodating member 40, and the accommodating member 40 is arranged on the inner periphery of the winding frame 33. The movable iron core 34 is arranged opposite to the fixed iron core 35 at a position closer to the separation direction Z2 side than the fixed iron core 35. The movable iron core 34 is urged toward the separation direction Z2 side by the force-applying member 36. In this embodiment, the movable iron core 34 is urged downward.

[0085] The positioning portion 6 is formed on the bottom 40a of the housing member 40. The positioning portion 6 includes a second inclined portion 6a. The second inclined portion 6a is formed on the bottom surface on the contact direction Z1 side. The second inclined portion 6a is formed to be inclined toward the separation direction Z2 side as it approaches the axis Ax of the drive shaft 4.

[0086] The first inclined portion 34a of the movable iron core 34 is formed on the surface on the separation direction Z2 side in the same manner as in the above-mentioned embodiment. The first inclined portion 34a is arranged opposite to the positioning portion 6 and can contact the positioning portion 6. The first inclined portion 34a has a shape corresponding to the second inclined portion 6a of the positioning portion 6. The first inclined portion 34a is formed to be inclined toward the separation direction Z2 side as it approaches the axis Ax of the drive shaft 4. In the third modified example, the same effect as in the above-mentioned embodiment can also be obtained.

[0087] Figure 7This is an enlarged cross-sectional view of the periphery of the barrel portion 111b of the contact housing 111 of the fourth modified example. In the fourth modified example, the first fixed terminal 114 and the second fixed terminal 115 are composed of substantially cylindrical terminals extending in the axial direction. The first fixed terminal 114 and the second fixed terminal 115 are, for example, mounted on a shell portion not shown. The first fixed terminal 114 includes a first fixed contact 114a. The second fixed terminal 115 includes a second fixed contact 115a.

[0088] The drive shaft 4 includes a first inclined portion 4b in contact with the positioning portion 6. The first inclined portion 4b is inclined toward the separating direction Z2 as it approaches the axis Ax of the drive shaft 4. The first inclined portion 4b is disposed facing the cylindrical portion 111b of the contact housing 111.

[0089] The positioning portion 6 positions the drive shaft 4 in the separated state. The positioning portion 6 is formed in the barrel 111b of the contact housing 111. The positioning portion 6 includes a second inclined portion 6a. The second inclined portion 6a is formed at the periphery of the through hole 118 of the barrel 111b on the contact direction Z1 side. The second inclined portion 6a is inclined toward the separation direction Z2 side as it approaches the axis Ax of the drive shaft 4. In the fourth modified example, when the positioning portion 6 positions the drive shaft 4, the impact force generated in the axial direction can be suppressed compared to the case where the drive shaft 4 and the positioning portion 6 collide with each other in a plane perpendicular to the drive shaft 4.

[0090] Figure 8 It is an enlarged sectional view of the periphery of the drive shaft 4 of the fifth variant. Specifically, it is an enlarged sectional view of the periphery of the end portion on the separation direction Z2 side of the drive shaft 4. In the fifth variant, similar to the fourth variant, the drive shaft 4 includes a first inclined portion 4b. The first inclined portion 4b is formed at the end portion on the separation direction Z2 side of the drive shaft 4. The first inclined portion 4b is inclined toward the separation direction Z2 side as it approaches the axis Ax of the drive shaft 4. The positioning portion 6 is arranged opposite to the end portion on the separation direction Z2 side of the drive shaft 4 at the cover 2b. The cover 2b is arranged at a position closer to the separation direction Z2 side than the drive shaft 4. The second inclined portion 6a of the positioning portion 6 is inclined toward the separation direction Z2 side as it approaches the axis Ax of the drive shaft 4.

[0091] Industrial Applicability

[0092] According to the present invention, the disconnection performance between the fixed contact and the movable contact can be improved.

Claims

1. An electromagnetic relay, characterized in that: include: Fixed contacts; A movable contact piece, comprising a movable contact point disposed opposite to the fixed contact point, wherein the movable contact piece is movable in a first direction in contact with the fixed contact point and in a second direction away from the fixed contact point; a driving shaft connected to the movable contact piece and movable along the first direction and the second direction together with the movable contact piece; A contact housing, comprising a through hole for the drive shaft to pass through and having a gap between the through hole and the drive shaft, and accommodating the fixed contact and the movable contact; an electromagnetic drive device including a movable iron core connected to the drive shaft in an integrally movable manner, the electromagnetic drive device causing the drive shaft to move together with the movable iron core, thereby switching between a contact state in which the movable contact is in contact with the fixed contact and a separation state in which the movable contact is separated from the fixed contact; and A positioning portion, which positions either the drive shaft or the movable iron core in the separated state, wherein: Either the drive shaft or the movable iron core includes a first inclined portion that contacts the positioning portion in the separated state, and only the first inclined portion contacts the positioning portion to be positioned.

2. The electromagnetic relay according to claim 1, characterized in that: The first inclined portion is inclined toward the first direction side or the second direction side as it approaches the axis of the drive shaft.

3. The electromagnetic relay according to claim 1 or 2, characterized in that: The first inclined portion includes a curved surface portion formed in a curved surface shape.

4. The electromagnetic relay according to claim 1 or 2, characterized in that: The positioning portion includes a second inclined portion in contact with the first inclined portion, The first inclined portion and the second inclined portion are inclined toward the first direction side or the second direction side as they approach the axis of the drive shaft.

5. The electromagnetic relay according to claim 1 or 2, characterized in that: Also includes a contact housing for accommodating the fixed contact and the movable contact, The contact housing includes a cylindrical portion disposed opposite to the movable iron core. The positioning portion is formed on the barrel portion, The movable iron core includes the first inclined portion.

6. The electromagnetic relay according to claim 1 or 2, characterized in that: The electromagnetic drive device includes a bottomed cylindrical accommodating member for accommodating the movable iron core. The movable iron core includes the first inclined portion, which is arranged opposite to the bottom of the accommodating member. The positioning portion is formed at the bottom of the accommodating component.

7. The electromagnetic relay according to claim 1 or 2, characterized in that: Also includes a contact housing for accommodating the fixed contact and the movable contact, The driving shaft includes the first inclined portion, The contact housing includes a cylindrical portion disposed opposite to the first inclined portion. The positioning portion is formed on the cylindrical portion.

8. The electromagnetic relay according to claim 1 or 2, characterized in that: further comprising a cover disposed on the second direction side relative to the drive shaft, The positioning portion is disposed opposite to the cover and one end of the drive shaft. The driving shaft includes the first inclined portion.

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