WO2015045738A1

WO2015045738A1 - Contact point mechanism part and electromagnetic relay equipped with same

Info

Publication number: WO2015045738A1
Application number: PCT/JP2014/072815
Authority: WO
Inventors: 裕二小材; 弘泰田中; 高橋　慶; 近藤　純久; 和也早田; 香織林田
Original assignee: オムロン株式会社
Priority date: 2013-09-27
Filing date: 2014-08-29
Publication date: 2015-04-02
Also published as: EP3051564A4; CN105103257B; MX2015003167A; EP3051564A1; CN105103257A; RU2015107537A; JP2015088463A; JP5720840B2; BR112015004484A2

Abstract

The objective of the present invention is to provide a highly reliable contact point mechanism part such that a large driving force is not required for separating and opening contact points, power consumption is low, and high precision control is possible. For this purpose, in the contact point mechanism part, a driving protrusion (43) provided at one end of a sliding card (40) engages with the free end of a movable contact piece (60), and the card (40) is caused to slide so as to pivot the movable contact piece (60), bringing a movable contact point (56) provided on the movable contact piece (60) into contact with a fixed contact point (52) or separating the movable contact point (56) therefrom. In particular, the driving protrusion (43) disposed on one end side of the card (40) and a return elastic tongue piece (67c) disposed on the free end side of the movable contact piece (60) so as to be abuttable against the driving protrusion (43) are provided so that the driving protrusion (43) and the return elastic tongue piece (67c) engage when the movable contact point (56) is in a state of abutting the fixed contact point (52).

Description

Contact mechanism and electromagnetic relay equipped with the same

The present invention relates to a contact mechanism, and more particularly to a contact mechanism incorporated in a switching device such as an electromagnetic relay.

Conventionally, as a contact mechanism unit incorporated in a switching device such as an electromagnetic relay, for example, as shown in FIG. 1 of Patent Document 1, an armature 10 is rotated based on application and stop of a voltage to an electromagnetic coil 8. As a result, the actuator 13 slides up and down. For this reason, the actuator 13 rotates the elastic contact piece 4, and the contact button 6 contacts and separates from the second relay contact 3.

US Pat. No. 6,661,319

However, in the contact mechanism described above, the projection 15 provided at the lower end of the actuator 13 has a substantially U-shape, so that the separation force at the time of return is almost uniformly applied to the entire width direction of the movable contact piece 4. Is done. For this reason, at the time of return, since only a substantially vertical tensile force acts on the movable contact piece 4, the contacts are not easily peeled from each other. As a result, there is a problem in that a large driving force is required for the armature 10 in order to separate it, and the power consumption is large.
In view of the above-described problems, an electromagnetic relay according to the present invention is to provide a contact mechanism unit that consumes less power and does not require a large driving force for opening a contact, and an electromagnetic relay including the same. .

In order to achieve the above object, the contact mechanism unit according to the present invention engages a driving protrusion provided on one end of a sliding card with a free end of a movable contact piece, and slides the card to move the card. A contact mechanism for rotating the movable contact piece and moving the movable contact provided on the movable contact piece to and away from the fixed contact, the driving protrusion disposed on one end side of the card, and the movable contact piece A return elastic tongue piece arranged on the free end side so as to be able to come into contact with the driving protrusion is provided, and the state shifts from the state in which the movable contact and the fixed contact are in contact with each other. In the process, the torsional moment acts on the movable contact piece by the driving protrusion engaging the return elastic tongue piece.

According to the present invention, at the time of return, the driving protrusion of the card comes into contact with the return elastic tongue piece of the movable contact piece, so that a so-called one-contact state is obtained. For this reason, since a torsional moment acts on the movable contact piece, a large opening force is not required for opening the contact, and a contact mechanism unit with low power consumption can be obtained.

As an embodiment of the present invention, a drive protrusion provided at a corner on one end side of the card, and a cut-out along the axial direction from at least one corner of the free end of the movable contact piece, and A return elastic tongue arranged so as to be able to come into contact with the driving protrusion, and in the process of shifting from the state in which the movable contact and the fixed contact are in contact with each other, A configuration may be adopted in which a torsional moment acts on the movable contact piece by engaging the projecting protrusion with the return elastic tongue piece.
According to this embodiment, at the time of return, the driving protrusion of the card comes into contact with the return elastic tongue piece of the movable contact piece, so that a so-called one-contact state is obtained. For this reason, since a torsional moment acts on the movable contact piece, a large opening force is not required for opening the contact, and a contact mechanism unit with low power consumption can be obtained.

As another embodiment of the present invention, a slit formed by providing a substantially L-shaped driving protrusion at a corner on one end side of the card, and at least one corner of the free end of the movable contact piece And a return elastic tongue piece disposed in the slit so as to be able to come into contact with the driving protrusion, and is separated from a state in which the movable contact and the fixed contact are in contact with each other. In the process of transitioning to a state, a torsional moment may be applied to the movable contact piece by the driving projection coming into contact with the return elastic tongue piece engaged with the slit.
According to the present embodiment, in addition to the above-described effects, by engaging the return elastic tongue piece with the slit, it becomes difficult for the return elastic tongue piece to come off, and a highly reliable contact mechanism portion is obtained. .

As a different embodiment of the present invention, the return elastic tongue extends from a free end of the one side edge located on the opposite side of the one side edge while providing a movable contact at one side edge of the movable contact piece. The driving protrusion may be brought into contact with the piece.
According to this embodiment, since the distance between fulcrums becomes long, a much larger torsional moment can be applied, and contact welding can be effectively eliminated.

As another embodiment of the present invention, a pair of movable contacts are arranged in parallel in the width direction at the free end of the movable contact piece, and a pair of fixed contacts that can be contacted and separated from the movable contact are arranged in parallel. May be.
According to the present embodiment, a double contact structure is provided, and a contact mechanism unit with higher contact reliability can be obtained.

The electromagnetic relay according to the present invention is configured to include any of the above-described contact mechanism units in order to achieve the above-described problem.

According to the present invention, at the time of return, the driving protrusion of the card comes into contact with the return elastic tongue piece of the movable contact piece, so that a so-called one-contact state is obtained. For this reason, since a torsional moment acts on the movable contact piece, there is an effect that an electromagnetic relay with low power consumption can be obtained without requiring a large opening force for opening the contact.

FIG. A is an overall perspective view of an electromagnetic relay to which the first embodiment of the present invention is applied, and FIG. B is an overall perspective view of the electromagnetic relay viewed from a different angle. It is a disassembled perspective view of 1st Embodiment shown in FIG. 1A. It is a disassembled perspective view of 1st Embodiment shown in FIG. 1B. It is a perspective view which shows the state which removed the cover from FIG. 1A. FIG. A is a plan sectional view of FIG. 4, and FIG. B is a partially enlarged perspective view of FIG. It is a perspective view of the box-shaped base shown in FIG. FIGS. A and B are a plan view and a cross-sectional view of the card shown in FIG. It is a disassembled perspective view of the movable contact piece shown in FIG. FIGS. A and B are plan views showing before and after operation of the electromagnetic relay shown in FIG. FIGS. A, B, and C are a front view, a back view, and a bottom view before the operation of the contact mechanism shown in FIG. FIGS. A, B, and C are a front view, a rear view, and a bottom view after the operation of the contact mechanism shown in FIG. It is a perspective view which shows the state which removed the cover from the electromagnetic relay to which 2nd Embodiment which concerns on this invention is applied. It is a disassembled perspective view of the electromagnetic relay which concerns on 2nd Embodiment shown in FIG. It is the disassembled perspective view seen from the different angle of 2nd Embodiment shown in FIG. FIGS. A and B are plan views showing before and after operation of the electromagnetic relay shown in FIG. FIGS. A, B, and C are a front view, a rear view, and a bottom view before the operation of the contact mechanism shown in FIG. FIGS. A, B, and C are a front view, a rear view, and a bottom view after the operation of the contact mechanism shown in FIG. It is a perspective view which shows the state which removed the cover from the electromagnetic relay to which 3rd Embodiment which concerns on this invention is applied. It is a disassembled perspective view of the electromagnetic relay which concerns on 3rd Embodiment shown in FIG. It is the disassembled perspective view seen from the different angle of 3rd Embodiment shown in FIG. It is a disassembled perspective view of the movable contact terminal and movable contact piece which were shown in FIG. FIGS. A and B are enlarged perspective views of the card shown in FIGS. FIGS. A and B are enlarged perspective views of the rotating block shown in FIGS. FIGS. A and B are a schematic front view and a schematic bottom view before the operation of the contact mechanism shown in FIG. FIGS. A and B are a schematic front view and a schematic bottom view after the operation of the contact mechanism shown in FIG.

An electromagnetic relay which is an embodiment to which the present invention is applied will be described with reference to the accompanying drawings of FIGS.
As shown in FIGS. 1 to 11, the electromagnetic relay according to the first embodiment includes a box-shaped base 10, an electromagnet block 20, a rotating block 30, a card 40, a contact mechanism unit 50, and a support plate 70. And a cover 80.

As shown in FIG. 6, the box-shaped base 10 has a planar rectangular shallow box shape, and the inside thereof is partitioned by an insulating wall 11 having an operation cutout portion 11 a, and a first recess 12. And a second recess 13 is formed. Further, the box-shaped base 10 has a shallow groove 14a extending vertically along the outer surface thereof, and a latch receiving portion 14b protruding from the bottom surface of the shallow groove 14a.
The first recess 12 is provided with a bearing portion 16 for supporting a rotation shaft portion 34a of the rotation block 30 described later on the bottom surface thereof, and is opposed to the bearing portion 16 therebetween. Positioning recesses 17a and 17b for positioning an electromagnet block 20 to be described later are provided at the positions. Further, a notch step portion 18 for positioning a spool 21 of an electromagnet block 20 described later is provided at the opening edge portion of the first recess 12.
Furthermore,

terminal grooves

15a and 15b for assembling a fixed contact terminal 51 and a movable contact terminal 54 of a contact mechanism section 50, which will be described later, are formed at the opening edge of the second recess 13.

As shown in FIG. 2, the electromagnet block 20 has a coil 23 wound around a spool 21 having

flanges

22 a and 22 b at both ends, and an iron core 24 in a through hole 22 c (FIG. 5) provided in the spool 21. And the

yokes

25 and 27 are fixed by caulking to both protruding ends. The

yokes

25 and 27 are formed by bending plate-like magnetic materials having

wide portions

26 and 28 each punched into a substantially T shape into an L-shaped cross section. Then, a pair of

coil terminals

29 and 29 are appropriately press-fitted into a plurality of terminal holes provided in the flange portion 22a of the spool 21, and lead wires of the coil 23 are respectively tangled to the

coil terminals

29 and 29, and soldered. It is attached.
In addition, by arranging a total of five terminal holes in the collar portion 22a, the number of coil terminals 29 and the press-fitting position can be appropriately selected according to customer needs and specifications. In addition, the coil terminal 29 does not have to be a simple bar shape, and may have a substantially T shape, for example, if necessary.

As shown in FIG. 5, the rotating block 30 includes a permanent magnet 30 a sandwiched between a pair of plate-shaped

movable iron pieces

31 and 32 and insert-molded to form a rotating block main body 33. As shown in FIG. 2, the rotating block body 33 has rotating

shaft portions

34 a and 34 b protruding on the same axial center on the upper and lower surfaces facing each other, and on the side surface of the rotating block body 33. The driving arm 35 is integrally formed. The driving arm portion 35 has an engaging claw portion 36 at the tip thereof.

As shown in FIG. 7, the card 40 has a drive hole 41 on one end side and an engagement hole 42 on the other end side. In addition, a driving protrusion 43 is provided at the corner on the one end side to have a substantially L-shaped plane, and a full-safe protrusion 45 is protruded from the edge of the driving hole 41. The driving protrusion 43 has a shape that allows one side edge of a movable contact piece 60 to be described later to come into contact with the torsional moment.

As shown in FIG. 2, the contact mechanism unit 50 includes a fixed contact terminal 51 and a movable contact terminal 54.
As shown in FIG. 3, a fixed contact 52 is caulked and fixed to the corner on one end side of the fixed contact terminal 51. On the other hand, as shown in FIG. 2, the movable contact terminal 54 has the movable contact piece 60 fixed by caulking on one end side thereof, and an operation hole 55 is provided on the lower end side thereof.
As shown in FIG. 8, the movable contact piece 60 has a structure in which three first, second, and third conductive thin plate springs 61, 65, and 67 are sequentially stacked. A movable contact 56 is caulked and integrated with one side edge portion.

The first conductive thin plate spring 61 has a spring constant adjusting slit 62a extending from one end portion to which the caulking is fixed toward the free end portion, and absorbs and alleviates expansion and contraction when rotating in the middle portion. In order to ensure smooth operation characteristics, a substantially U-shaped curved portion 63a is provided. The first conductive thin plate spring 61 has its free end divided into three in the width direction, a driving elastic tongue 64a is formed at the center thereof, and reinforcing

elastic tongues

64b and 64c are formed on both sides thereof. It is provided.

The second conductive thin leaf spring 65 has a spring constant adjusting slit 62b extending from one end portion to which the caulking is fixed toward the free end portion, and absorbs and relaxes expansion and contraction when it rotates in the middle portion. In order to ensure smooth operation characteristics, a substantially U-shaped curved portion 63b is provided. Further, the second conductive thin plate spring 65 is formed with an engagement notch 66a at the center of the free end thereof, and the inner edge of the engagement notch 66a is opposed to raise the position.

Elastic tongue pieces

66b and 66c are formed.

The third conductive thin plate spring 67 is provided with a substantially U-shaped curved portion 63c in the middle portion thereof to absorb and relieve expansion and contraction when rotating, and to ensure smooth operation characteristics. In addition, the third conductive thin plate spring 67 is obtained by dividing the free end portion of which the center portion is notched into three in the width direction and bending it in the same direction, whereby the position restricting elastic tongue piece 67a and the return elastic member 67a.

Tongue pieces

67b and 67c are formed.

The spring constant can be changed by appropriately adjusting the width and length dimensions of the spring

constant adjusting slits

62a and 62b provided in the first and second conductive thin plate springs 61 and 65, respectively. For this reason, it is easy to adjust the spring load at the time of operation and return, and there is an advantage that the degree of freedom of design is large.

As shown in FIG. 4, the support plate 70 is bridged with its both ends locked to the opening edge of the box-shaped base 10. As shown in FIG. 2, the support plate 70 is fitted with the rotation shaft portion 34 b of the rotation block 30 in the bearing hole 71 provided in the center thereof, and is provided on both sides of the bearing hole 71. By fitting the

other end portions

26b and 28b of the

wide portions

26 and 28 of the

yokes

25 and 27 into the positioning

square holes

72 and 72, the electromagnet block 20 and the rotating block 30 can be assembled with high assembly accuracy. Can be positioned.

The cover 80 is a flat rectangular shape that can cover the opening of the box-shaped base 10, and an elastic locking portion 81 extends downward from each side of the outer peripheral edge.

The procedure for assembling the electromagnetic relay will be described.
First, as shown in FIGS. 2 and 5,

wide portions

26, 27 of the

yokes

25, 27 are formed in

positioning recesses

17a, 17b provided on the bottom surface of the first recess 12 of the box-shaped base 10 (FIG. 6). The one

end portions

26a and 28a of 28 are fitted and positioned. Further, positioning is performed by fitting the flange portion 22 a of the spool 21 to the notch step portion 18 of the box-shaped base 10. In this embodiment, since the electromagnet block 20 is positioned at a plurality of locations on the box-shaped base 10, there is an advantage that assembly accuracy is high. Then, the fixed contact terminal 51 is press-fitted into the terminal groove 15a of the second recess 13 and positioned.

On the other hand, as shown in FIG. 5, the card 40 is inserted into the operation hole 55 of the movable contact terminal 54, and the card 40 is assembled to the movable contact piece 60 that is caulked and fixed to the movable contact terminal 54. For convenience of explanation, the movable contact terminal 54 is not shown in FIG. 5B.
That is, as shown in FIG. 5B, the elastic tongue piece 64a for driving the first conductive thin plate spring 61 is inserted into the drive hole 41 of the card 40, and the elastic tongue piece for position regulation of the second conductive thin plate spring 65 is inserted. 66b, 66c engages both sides of the card 40 to restrict (hold) the position. Then, the elastic tongue 67a for position restriction of the third conductive thin plate spring 67 is locked to one end of the card 40, and the

elastic tongues

67b and 67c for return are driven protrusions 43 and 44 of the card 40. (FIG. 10C), and the vertical position is restricted. Further, the engaging claw portion 36 of the rotating block 30 is engaged with the engaging hole 42 of the card 40 (FIG. 5), and is inserted into the box-shaped base 10 as it is. And the said card | curd 40 is inserted in the notch 11a for operation of the insulating wall 11 of the said box-shaped base 10, and the said movable contact terminal 54 is press-fitted and positioned in the said terminal groove 15b. Next, the rotation shaft portion 34a of the rotation block 30 is fitted to the bearing portion 16 of the box-shaped base 10, and the rotation block 30 is rotatably supported.

Further, both ends of the support plate 70 are engaged and bridged to the opening edge of the box-shaped base 10, and the rotation shaft portion 34 b of the rotation block 30 is fitted into the bearing hole 71 and the positioning square is fitted. The other ends 26b and 28b of the

yokes

25 and 27 are fitted and positioned in the

holes

72 and 72, respectively. For this reason, the electromagnet block 20 and the rotation block 30 are positioned with high positional accuracy on the box-shaped base 10, and there is an advantage that there is no variation in operating characteristics.
Finally, the cover 80 is positioned so as to cover the opening of the box-shaped base 10, and the elastic locking portion 81 of the cover 80 is locked to the locking receiving portion 14b of the box-shaped base 10, Assembly work is completed.

Next, the operation of this embodiment will be described.
As shown in FIG. 9A, the rotating block 30 has a plate-like shape in which one end portion 32 a of the plate-like movable iron piece 32 is attracted to the wide portion 26 of the yoke 25 by the magnetic force of a permanent magnet (not shown). The other end 31 b of the movable iron piece 31 is attracted to the wide portion 28 of the yoke 27. For this reason, the movable contact piece 60 is pulled in the direction of the movable contact terminal 54 against the spring force via the card 40. As a result, the movable contacts 56 are separated from the fixed contacts 52, respectively. For convenience of explanation, the support plate 70 is not shown in FIGS. 9A and 9B.

Then, a voltage is applied to the coil 23 to excite it so that a magnetic force in a direction to cancel the magnetic force of the permanent magnet of the rotating block 30 is generated. As a result, one end portion 31 a of the plate-shaped movable iron piece 31 of the rotating block 30 is attracted to the wide portion 26 of the yoke 25, and the plate-like shape of the rotating block 30 to the wide portion 28 of the yoke 27. The other end 32b of the movable iron piece 32 is sucked and the turning block 30 is turned. For this reason, the driving arm portion 35 presses the card 40, and further, the spring force of the movable contact piece 60 acts on the card 40 via the driving elastic tongue 64a. Slide in the direction you head. As a result, the movable contact piece 60 moves in a direction away from the movable contact terminal 54 by the spring force, and the movable contact 56 contacts the fixed contact 52. Next, one end 31 a of the plate-shaped movable iron piece 31 of the rotating block 30 is adsorbed to the wide portion 26 of the yoke 25, and the other end 32 b of the plate-shaped movable iron piece 32 is adsorbed to the wide portion 28 of the yoke 27. To do. Therefore, even when the application of voltage to the coil 23 is stopped, the position of the card 40 is fixed based on the magnetic force of the permanent magnet, and the movable contact 56 and the fixed contact 52 are kept in contact with each other. To do. In this state, the drive projection 43 and the return elastic tongue 67b are separated.

Next, when a voltage in the opposite direction to the above is applied to the coil 23, one end portion 32a of the plate-shaped movable iron piece 32 is attracted to the wide portion 26 of the yoke 25, and the other end portion 31b of the plate-shaped movable iron piece 31 is It is attracted to the wide portion 28 of the yoke 27. For this reason, the rotation block 30 rotates in the opposite direction, the card 40 is pulled by the engaging claw portion 36 of the rotation block 30, and the card 40 slides in a direction to be separated from the fixed contact terminal 51. At this time, the driving protrusion 43 abuts on the return elastic tongue 67 b of the third conductive thin plate spring 67. That is, in the process of shifting from the state in which the movable contact 56 and the fixed contact 52 are in contact with each other to the state in which the movable contact 56 and the fixed contact 52 are separated from each other, The driving projection 43 of the card 40 is in a one-sided state. Therefore, not only a tensile force but also a torsional moment acts on the third conductive thin plate spring 67, and the movable contact 56 is separated from the fixed contact 52. In particular, since the driving protrusion 43 comes into contact with one side edge opposite to the one side edge provided with the fixed contact 52, the distance between the fulcrums is long and a large torsional moment is applied. There is an advantage that you can.
Therefore, even if contact welding occurs, there is an advantage that the movable contact 56 can be easily separated from the fixed contact 52.

As shown in FIGS. 12 to 17, the second embodiment is substantially the same as the first embodiment described above. And, as shown in FIG. 13, as shown in FIG. 13, the

movable contacts

56 and 57 are juxtaposed in the width direction at the free end portion of the movable contact piece 60 and fixed by caulking, and as shown in FIG. The fixed

contacts

52 and 53 are juxtaposed in the width direction on one end side of the fixed contact terminal 51 and are fixed by caulking.
Accordingly, as shown in FIGS. 15 to 17, the

movable contacts

56 and 57 are opposed to the fixed

contacts

52 and 53 so as to be able to contact and separate. The other parts are the same as those in the first embodiment, and the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

The operation of the second embodiment is almost the same as that of the first embodiment. When the electromagnet block 20 is excited to rotate the rotation block 30 and the card 40 is slid, the first conductive thin plate spring 61 is moved. Accordingly, the

movable contacts

56 and 57 simultaneously contact the fixed

contacts

52 and 53. Even if the application of voltage to the coil 23 of the electromagnet block 20 is stopped, the operating state of the card 40 is maintained based on the magnetic force of the permanent magnet, and the

movable contacts

56 and 57 and the fixed

contacts

52 and 53 are maintained. The closed state is maintained.

Next, when a reverse voltage is applied to the coil 23 of the electromagnet block 20, the rotating block 30 rotates in the reverse direction, and the card 40 is reversed via the engaging claw 36 of the rotating block 30. Slide in the direction. For this reason, the driving protrusion 43 of the card 40 abuts on the return elastic tongue 67c of the third conductive thin plate spring 67, and a torsional moment acts on the entire movable contact piece 60. For this reason, not only a tensile force but a torsional moment acts on the third conductive thin plate spring 67. As a result, after the movable contact 57 is separated from the fixed contact 53, the movable contact 56 is separated from the fixed contact 52. As a result, even if contact welding occurs, there is an advantage that the

movable contacts

56 and 57 can be easily separated from the fixed

contacts

52 and 53.

As shown in FIGS. 18 to 25, the third embodiment is substantially the same as the first embodiment described above, and includes a box-shaped base 10, an electromagnet block 20, a rotating block 30, a card 40, and contacts. The mechanism unit 50, the support plate 70, and the cover 80 are configured. For this reason, the same numbers are assigned to the same parts and the description thereof is omitted, but the main differences between the components are described in detail.

As shown in FIG. 19, the box-shaped base 10 is substantially the same as that of the first embodiment described above. The major difference is that a pair of positioning protrusions 10 a are provided on the bottom surface of the first recess 12. The positioning projection 10a is provided with a positioning hole 10b. However, for the convenience of explanation, the positioning protrusion located on the near side is not shown. The box-shaped base 10 is provided with mounting

holes

19 and 19 at corners on a diagonal line.

In the electromagnet block 20, a coil 23 is wound with two windings around a spool 21 having

flange portions

22a and 22b at both ends, and the lead wire is wound around three coil terminals 29 press-fitted into the flange portion 22a. Soldered. Then, the iron core 24 inserted into the spool 21 is inserted, and substantially L-shaped

yokes

25 and 27 are fixed by caulking to both protruding ends. The front ends of the

yokes

25 and 27 are

magnetic pole portions

25a and 27a.

As shown in FIG. 23, the rotating block 30 includes a permanent magnet 30a (not shown) sandwiched between a pair of plate-shaped

movable iron pieces

31 and 32, and insert-molded to form a rotating block main body 33. It is. The rotating block body 33 has rotating

shaft portions

34 a and 34 b projecting on the same upper axis on the upper and lower surfaces facing each other, and a driving arm portion 35 is integrally formed on the side surface of the rotating block body 33. Molded. The driving arm portion 35 has an engaging claw portion 36 at the tip thereof.

As shown in FIG. 22, the card 40 has an engagement hole 42 on one end side, a substantially L-shaped driving projection 43 at a corner on the other end side, and a slit 46. It is. The driving protrusion 43 has a shape that allows one side edge of a movable contact piece 60 to be described later to come into contact with the torsional moment. The drive protrusion 43 is provided with a pair of

position restricting protrusions

47, 47.

As shown in FIGS. 19 and 20, the contact mechanism unit 50 includes a fixed contact terminal 51 and a movable contact terminal 54.
As shown in FIG. 19, a fixed contact 52 is fixed to the corner of one end of the fixed contact terminal 51 by caulking. On the other hand, the movable contact terminal 54 has the movable contact piece 60 fixed by caulking at one end thereof, and an operation slit 55a is provided at the lower end thereof.
The movable contact piece 60 has a structure in which four first, second, third, and fourth conductive thin plate springs 61, 65, 67, 68 are sequentially stacked as shown in FIG. The movable contact 56 is caulked and fixed at one corner of the free end.

The first conductive thin plate spring 61 is formed with divided

pieces

61a and 61b that are divided into two in the width direction from the one end portion to be caulked and fixed to the free end portion. The

split pieces

61a and 61b are provided with a substantially U-shaped curved portion 63a at the intermediate portion in order to absorb and relieve expansion and contraction when rotating, and to ensure smooth operation characteristics. Further, the

split pieces

61a and 61b are cut into elastically deformable

bent pieces

61c and 61d by providing semicircular slits in the vicinity of their free ends, respectively. Further, the movable contact 56 is caulked and fixed to the bent piece 61c so that the contact pressure can be adjusted.

The second conductive thin plate spring 65 is formed with divided

pieces

65a and 65b that are divided into two in the width direction from one end portion to be caulked and fixed to the free end portion. The

split pieces

65a and 65b are provided with a substantially U-shaped curved portion 63b in the middle portion thereof to absorb and relieve expansion and contraction when rotating, and to ensure smooth operation characteristics. Further, the movable contact 56 is caulked and fixed to the divided piece 65a.

The third conductive thin plate spring 67 is formed with

split pieces

67d and 67e that are divided into two in the width direction from one end portion to be caulked and fixed to the free end portion. The

split pieces

67d and 67e are provided with a substantially U-shaped curved portion 63c at an intermediate portion thereof to absorb and relieve expansion and contraction when rotating, and to ensure smooth operation characteristics. Further, the movable contact 56 is caulked and fixed to the divided piece 67d.

The fourth conductive thin plate spring 68 is provided with a substantially U-shaped curved portion 63d at its intermediate portion in order to absorb and relieve expansion and contraction when rotating, and to ensure smooth operation characteristics. Further, the fourth conductive thin plate spring 68 has a return elastic tongue piece 68a and a position restricting elastic member that can be locked from above and below to the driving protrusion 43 of the card 40 from one corner of the free end edge thereof. The tongue piece 68b is projected and bent. The return elastic tongue 68a is formed with

position restricting ribs

68c and 68c for restricting the position in the width direction by bending both ends thereof. Further, a movable contact 56 is caulked and fixed to the corner of the free end of the fourth conductive thin plate spring 68.

The first, second, and third conductive

thin leaf springs

61, 65, and 67 are divided into two parts in the width direction so as to be shared with other electromagnetic relays. Instead, it may be in the form of a single conductive thin leaf spring. Further, the

bent pieces

61c and 61d of the first conductive thin plate spring 61 are not necessarily required, and may be provided as necessary.

19 and 20, the support plate 70 has a bearing hole 71 at the center thereof, and is provided with

positioning projections

73 and 74 having different diameters from the lower surfaces of both end portions thereof. The diameters of the

positioning protrusions

73 and 74 are different in order to prevent erroneous insertion. The support plate 70 is fitted with a rotation shaft portion 34b of the rotation block 30 in a bearing hole 71 provided at the center thereof, and the

positioning projections

73 and 74 are positioned on the positioning projection portion of the box-shaped base 10. The rotary block 30 can be positioned with high assembly accuracy by being press-fitted into the positioning hole 10b provided in 10a and suspended.

The cover 80 is a flat rectangular shape that can cover the opening of the box-shaped base 10, and has elastic locking portions 81 extending downward from each side of the outer peripheral edge portion, and at the corners of the lower surface thereof. A mounting cylinder portion 82 provided with a through hole 82a is projected.

The procedure for assembling the electromagnetic relay will be described.
First, as shown in FIG. 19, a pair of positioning protrusions 10a (the positioning protrusions 10a on the front side not shown) projecting from the bottom surface of the box-shaped base 10 are connected to the magnetic pole portions 25a of the

yokes

25 and 27. 27a are engaged and positioned. In this embodiment, since the electromagnet block 20 is positioned at a plurality of locations on the box-shaped base 10, there is an advantage that assembly accuracy is high. Then, the fixed contact terminal 51 is press-fitted and positioned in the terminal groove 15 a communicating with the second recess 13.

On the other hand, the engaging claw portion 36 of the rotating block 30 is engaged with the engaging hole 42 of the card 40, inserted into the box-shaped base 10 as it is, positioned, and insulated from the box-shaped base 10. The card 40 is inserted into the operation notch 11 a provided on the wall 11. Then, the movable contact terminal 54 is press-fitted and positioned in the terminal groove 15b. At this time, the movable contact piece 60 is inserted into the slit 46 of the already positioned card 40 while being elastically deformed. For this reason, the

position restricting ribs

68 c and 68 c are elastically engaged between the pair of

position restricting protrusions

47 and 47 protruding from the driving protrusion 43 of the card 40. At the same time, the drive protrusion 43 is sandwiched between the return elastic tongue 68a and the position restricting elastic tongue 68b. At this time, the free end portion of the first conductive thin plate spring 61 comes into pressure contact with the inner surface of the slit 46 of the card 40 and urges the card 40 toward the movable contact terminal 54 side.
According to this embodiment, since the movable contact piece 60 can be assembled to the card 40 through the slit 46 of the card 40 with one touch, there is an advantage that productivity is high.

Further, the

positioning projections

73 and 74 of the support plate 70 are press-fitted into the positioning holes 10b of the pair of positioning projections 10a projecting from the box-shaped base 10 and bridged. The rotating shaft part 34b is fitted. For this reason, the electromagnet block 20 and the rotation block 30 are positioned with high positional accuracy on the box-shaped base 10, and there is an advantage that there is no variation in operating characteristics.
Finally, the cover 80 is positioned so as to cover the opening of the box-shaped base 10 and fitted into the mounting

holes

19 and 19 of the box-shaped base 10 respectively. Further, the assembly operation is completed by locking the elastic locking portion 81 of the cover 80 to the locking receiving portion 14 b of the box-shaped base 10.
According to this embodiment, since all the components can be assembled sequentially from above the box-shaped base 10, there is an advantage that assembly is easy and productivity is high.

Next, the operation of the electromagnetic relay will be described.
As shown in FIG. 24, the rotating block 30 has a plate-like movable portion while the one end portion 32 a of the plate-like movable iron piece 32 is attracted to the magnetic pole portion 25 a of the yoke 25 by the magnetic force of a permanent magnet (not shown). The other end portion 31 b of the iron piece 31 is attracted to the magnetic pole portion 27 a of the yoke 27. For this reason, the movable contact piece 60 is pulled in the direction of the movable contact terminal 54 against the spring force via the card 40. As a result, the movable contacts 56 are separated from the fixed contacts 52, respectively. For convenience of explanation, the support plate 70 is not shown in FIGS.

Then, a voltage is applied to the coil 23 to excite it so that a magnetic force in a direction to cancel the magnetic force of the permanent magnet of the rotating block 30 is generated. Thereby, one end 31a of the plate-shaped movable iron piece 31 of the rotating block 30 is attracted to the magnetic pole part 25a of the yoke 25, and the plate-shaped movable iron piece of the rotating block 30 is attracted to the magnetic pole part 27a of the yoke 27. The other end 32b of 32 is sucked, and the rotation block 30 rotates. For this reason, the driving arm portion 35 presses the card 40 and the card 40 slides in the direction toward the fixed contact terminal 51, whereby the card 40 is moved to the first conductive thin plate spring 61 of the movable contact piece 60. Act on. As a result, the movable contact piece 60 rotates in a direction away from the movable contact terminal 54, and the movable contact 56 contacts the fixed contact 52. Next, one end portion 31 a of the plate-shaped movable iron piece 31 of the rotating block 30 is attracted to the magnetic pole portion 25 a of the yoke 25, and the other end portion 32 b of the plate-shaped movable iron piece 32 is attracted to the magnetic pole portion 27 a of the yoke 27 ( FIG. 25). Therefore, even when the application of voltage to the coil 23 is stopped, the position of the card 40 is fixed based on the magnetic force of the permanent magnet, and the movable contact 56 and the fixed contact 52 are kept in contact with each other. To do. In this state, the driving protrusion 43 is not in pressure contact with the free end of the fourth conductive thin plate spring 68.

Next, when a voltage in the opposite direction to the above is applied to the coil 23, one end portion 32a of the plate-shaped movable iron piece 32 is attracted to the magnetic pole portion 25a of the yoke 25, and the other end portion 31b of the plate-shaped movable iron piece 31 is 27 magnetic poles 27a are attracted. For this reason, the rotation block 30 rotates in the opposite direction, the card 40 is pulled by the engaging claw portion 36 of the rotation block 30, and the card 40 slides in a direction to be separated from the fixed contact terminal 51. At this time, the driving protrusion 43 abuts on the base of the return elastic tongue piece 68 a of the fourth conductive thin plate spring 68. That is, in the process of shifting from the state in which the movable contact 56 and the fixed contact 52 are in contact with each other to the state in which the movable contact 56 and the fixed contact 52 are separated from each other, The driving projection 43 of the card 40 is in a one-sided state. Therefore, not only a tensile force but also a torsional moment acts on the fourth conductive thin plate spring 68, and the movable contact 56 is separated from the fixed contact 52. In particular, since the driving protrusion 43 comes into contact with one side edge opposite to the one side edge provided with the fixed contact 52, the distance between the fulcrums is long and a large torsional moment is applied. There is an advantage that you can.
Therefore, even if contact welding occurs, there is an advantage that the movable contact 56 can be easily separated from the fixed contact 52.

Of course, the movable contact piece and the contact mechanism according to the present invention are not limited to the electromagnetic relay described above, and may be applied to other electric switches.

DESCRIPTION OF SYMBOLS 10: Box-shaped base 10a: Positioning protrusion 10b: Positioning hole 11: Insulating wall 11a: Notch for operation 12: 1st recessed part 13: 2nd recessed part 15a, 15b: Terminal groove 16: Bearing part 17a, 17b : Positioning concave portion 18: Notched step portion 19: Mounting hole 20: Electromagnet block 21: Spool 22 a, 22 b: collar portion 23: coil 24: iron core 25, 27: yoke 26, 28: wide portion 29: coil terminal 30 : Rotating block 31, 32: plate-shaped movable iron piece 33: rotating block main body 34a, 34b: rotating shaft portion 35: driving arm portion 36: engaging claw portion 40: card 41: driving hole 42: engaging hole 43: Drive projection 45: Full safe projection 46: Slit 50: Contact mechanism 51: Fixed contact terminal 52, 53: Fixed contact 54: Movable contact end Element 55: Operation hole 56, 57: Movable contact 60: Movable contact piece 61: First conductive thin plate spring 62a, 62b: Spring constant adjusting slit 63a, 63b, 63c: Curved portion 64a: Driving elastic tongue piece 64b, 64c: elastic tongue piece for reinforcement 65: second conductive thin plate springs 66b, 66c: elastic tongue piece for position regulation 67: third conductive thin plate spring 67a: elastic tongue piece for position regulation 67b, 67c: elastic tongue piece for return 67d, 67e: Dividing piece 68: Fourth conductive thin plate spring 68a: Return elastic tongue piece 68b: Position restricting elastic tongue piece 68c: Position restricting rib 70: Support plate 71: Bearing hole 72: Positioning rectangular hole 73, 74: Positioning projection 80: Cover 81: Elastic locking part 82: Mounting cylinder part

Claims

A driving protrusion provided at one end of a sliding card is engaged with a free end of a movable contact piece, the card is slid to rotate the movable contact piece, and a movable provided on the movable contact piece. A contact mechanism that contacts and separates the contact from the fixed contact;
A driving protrusion disposed on one end of the card; and a return elastic tongue disposed on the free end of the movable contact piece so as to be able to contact the driving protrusion; and the movable contact; In the process of shifting from the state in which the fixed contact is in contact to the state in which the fixed contact is released, the torsional moment is applied to the movable contact piece by the drive protrusion engaging the return elastic tongue piece. The contact mechanism part characterized by that.
Cut out along the axial direction from at least one corner of the free end of the movable contact piece and the drive projection provided at the corner on one end of the card, and abut against the drive projection An elastic tongue for return that can be arranged, and in the process of shifting from a state in which the movable contact and the fixed contact are in contact to a state in which the movable contact is separated, the drive protrusion is configured to return the return elastic 2. The contact mechanism according to claim 1, wherein a torsional moment acts on the movable contact piece by engaging with the tongue piece.
A slit formed by providing a substantially L-shaped driving protrusion at a corner on one end side of the card; and a protrusion protruding from at least one corner of the free end of the movable contact piece; In the process of shifting from the state where the movable contact and the fixed contact are in contact to each other, the slit is formed in the slit. 2. The contact mechanism according to claim 1, wherein a torsional moment acts on the movable contact piece when the driving protrusion comes into contact with the engaged return elastic tongue piece.
While providing a movable contact at one side edge of the movable contact piece, the drive projection is provided on the return elastic tongue extending from the free end of the one side edge located on the opposite side of the one side edge. The contact mechanism according to claim 1, wherein the contact mechanism is in contact with the contact mechanism.
5. A pair of movable contacts are arranged side by side in the width direction at the free end of the movable contact piece, and a pair of fixed contacts that can be brought into contact with and separated from the movable contact are arranged in parallel. The contact mechanism part according to item 1.
An electromagnetic relay comprising the contact mechanism according to any one of claims 1 to 5.