WO2015005313A1

WO2015005313A1 - Contact point mechanism part, and electromagnetic relay provided with same

Info

Publication number: WO2015005313A1
Application number: PCT/JP2014/068132
Authority: WO
Inventors: 裕二小材; 弘泰田中; 伸一古荘
Original assignee: オムロン株式会社
Priority date: 2013-07-12
Filing date: 2014-07-08
Publication date: 2015-01-15
Also published as: EP3021342A4; EP3021342B1; RU2615981C1; CN104508787A; JP2015018762A; CN104508787B; JP5692298B2; EP3021342A1

Abstract

In this contact mechanism part, driving protrusion parts (43, 44) disposed on one end of a card (40) that slides engage with the free edge part of a moveable contact piece (60), the moveable contact piece (60) is turned by sliding the card (40), and moveable contact points (56, 57) provided to the moveable contact piece (60) come into and out of contact with fixed contact points (52, 53). In particular, the present invention is provided with a pair of driving protrusion parts (43, 44) which protrudes in the opposite direction from corner parts adjacent to the one end of the card (40), and a pair of elastic returning tongue pieces (67b, 67c) which is cut out of the free edge part of the moveable contact piece (60) and which is arranged so as to be able to come into contact with the driving protrusion parts (43, 44). When the moveable contact points (56, 57) and the fixed contact points (52, 53) come into contact with one another, the distance between one of the driving protrusion parts (43) and one of the elastic returning tongue pieces (67b) becomes shorter than the distance between the other driving protrusion part (44) and the other elastic returning tongue piece (67c).

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 the force in the substantially vertical direction acts on the movable contact piece 4, the contacts are not easily separated 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 has an object to provide a contact mechanism unit that does not require a large driving force for opening a contact and consumes less power, and an electromagnetic relay including the contact mechanism unit. .

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, and a pair of protrusions projecting in opposite directions from adjacent corners on one end side of the card A drive protrusion and a pair of return elastic tongue pieces cut out from the free end of the movable contact piece and arranged so as to contact each of the drive protrusions, and the movable contact and the fixed In a state where the contact is in contact, the distance between one of the driving protrusions and one of the return elastic tongues is such that the other drive protrusion and the other return elastic tongue The distance is smaller than the distance between the two.

According to the present invention, after one driving protrusion of the card abuts on one return elastic tongue of the movable contact piece at the time of return after operation, the other driving protrusion of the card is moved to the movable contact piece. It abuts against the other return elastic tongue piece and temporarily becomes a so-called one-contact state. 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.
In addition, the desired opening force and torsional moment can be applied simply by adjusting the mutual distance between the pair of drive protrusions of the card and the return elastic tongue of the pair of movable contact pieces. Not only is it easy, but also high-precision control is possible, improving reliability.

As an embodiment of the present invention, in the process of shifting from a state where the movable contact and the fixed contact are in contact to a state where they are separated, one drive protrusion and one return elastic tongue And the other driving projection and the other return elastic tongue piece may be separated from each other.
According to this embodiment, in addition to the above-described effects, unnecessary backlash of the return elastic tongue piece can be reduced, dead space is eliminated, and a small contact mechanism portion can be obtained.

As another embodiment of the present invention, the pair of driving protrusions of the card may have different shapes, and the pair of return elastic tongues of the movable contact piece may have the same shape.
According to the present embodiment, the pair of return elastic tongues of the elastic movable contact piece can be brought into contact with the pair of driving protrusions of the card with a time difference substantially like the contact mechanism portion described above. Thus, a contact mechanism unit with low power consumption and high contact reliability can be obtained.

As another embodiment of the present invention, the pair of driving protrusions of the card may have the same shape, and the pair of return elastic tongues of the movable contact piece may have different shapes.
According to the present embodiment, the degree of freedom of design is widened and the design is facilitated.

In another embodiment of the present invention, a pair of movable contacts may be 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 may be arranged in parallel. Good.
According to this embodiment, since it becomes a double contact structure, a contact mechanism part with higher contact reliability is obtained.

The electromagnetic relay according to the present invention has a configuration including any one of the above-described contact mechanism units in order to achieve the above-described problem.

According to the present invention, after one driving protrusion of the card abuts on one return elastic tongue of the movable contact piece at the time of return after operation, the other driving protrusion of the card is moved to the movable contact piece. It abuts against the other return elastic tongue piece and temporarily becomes a so-called one-contact state. 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 an electromagnetic relay with low power consumption can be obtained.
In addition, the desired opening force and torsional moment can be applied simply by adjusting the mutual distance between the pair of drive protrusions of the card and the return elastic tongue of the pair of movable contact pieces. In addition to facilitating the control, high-precision control is possible and the reliability is improved.

FIG. A is an overall perspective view of an electromagnetic relay to which the first embodiment according to the present invention is applied, and FIG. B is a perspective view showing a state where a cover is removed from the first embodiment of FIG. FIGS. A and B are plan views showing before and after operation. It is a disassembled perspective view of 1st Embodiment shown in FIG. 1A. It is the disassembled perspective view seen from the angle different from FIG. It is a perspective view of the box-shaped base shown in FIG. 1B. It is a principal part disassembled perspective view of 1st Embodiment shown in FIG. 1B. FIGS. A, B and C are a front view, a bottom view and a rear view of the contact mechanism shown in FIG. FIGS. A and B are a plan view and a cross-sectional view of the card shown in FIG. FIGS. A and B are a partially enlarged perspective view and a bottom view of the drive mechanism shown in FIG. FIGS. A and B are a front view and a rear view showing a contact mechanism part of a second embodiment according to the present invention. FIGS. A and B are a bottom view of the contact mechanism shown in FIG. 10 and a perspective view of a third conductive thin plate spring.

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.
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 50, a support plate 70, and a cover 80. .

As shown in FIG. 5, 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. 6, the electromagnet block 20 has a coil 23 wound around a spool 21 having

flanges

22a and 22b at both ends, and an iron core 24 is inserted into a through hole 22c provided in the spool 21, The

yokes

25 and 27 are caulked and fixed to both projecting 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, 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, 29 and soldered. It is.
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.

The rotating block 30 has a rotating block main body 33 formed by sandwiching a permanent magnet (not shown) between a pair of plate-shaped

movable iron pieces

31 and 32 and insert molding. 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 formed at the tip thereof.

As shown in FIG. 8, the card 40 has a drive hole 41 on one end side and an engagement hole 42 on the other end side. Further, driving

protrusions

43 and 44 project from the adjacent corners on the one end side in opposite directions, have a substantially planar T shape, and have a full-safe protrusion 45 at the edge of the driving hole 41. Is protruding. Of the drive protrusions 43, 44, one drive protrusion 43 is larger in thickness than the other drive protrusion 44, and has a shape in which a movable contact piece 60 described later cannot abut simultaneously. .

As shown in FIGS. 6 and 7, the contact mechanism unit 50 includes a fixed contact terminal 51 and a movable contact terminal 54. In FIG. 7, for convenience of explanation, the distal end portions of the return

elastic tongue pieces

67 b and 67 c provided at the free end portion of the second conductive thin plate spring 65 are shown in a partially cut away state.
A pair of fixed

contacts

52 and 53 are fixed to the fixed contact terminal 51 in the width direction at one end thereof.
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 hole 55 is provided at the lower end thereof. The movable contact piece 60 has a structure in which three first, second, and third conductive thin plate springs 61, 65, 67 are sequentially stacked, and a pair of

movable contacts

56, 57 are provided at the free ends thereof. They are integrated by caulking in the width direction.

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. 3, the support plate 70 is bridged with its both ends locked to the opening edge of the box-shaped base 10. The support plate 70 is fitted with a rotation shaft portion 34b of the rotation block 30 in a bearing hole 71 provided in the center thereof, and positioning

rectangular holes

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

The cover 80 has a planar rectangular shape capable of covering the opening of the box-shaped base 10, and has elastic locking portions 81 extending downward from each side of the outer peripheral edge.

The procedure for assembling the electromagnetic relay will be described.
First, as shown in FIGS. 3 and 5, one end of the

wide portions

26 and 28 of the

yokes

25 and 27 is formed in the positioning recesses 17 a and 17 b provided on the bottom surface of the first recess 12 of the box-shaped base 10. 26a and 28a 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 FIGS. 3 and 9, 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.
That is, as shown in FIG. 9, 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. Are engaged with each other to regulate the position in the vertical direction. Further, the engaging claw portion 36 of the rotating block 30 is engaged with the engaging hole 42 of the card 40 and 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

wide portions

26 and 28 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. 2A, the rotating block 30 is configured such that one end portion 32 a of the 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), and The other end 31 b is adsorbed 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 and 57 are separated from the fixed

contacts

52 and 53, respectively. For convenience of explanation, the support plate 70 is not shown in FIGS. 2A and 2B.

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 electromagnet block 20 is generated. As a result, one end 31 a of the movable iron piece 31 of the rotating block 30 is attracted to the wide portion 26 of the yoke 25 and the movable iron piece 32 of the rotating block 30 is attracted to the wide portion 28 of the yoke 27. The other end 32b 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 its spring force, and the

movable contacts

56 and 57 abut against the fixed

contacts

52 and 53, respectively. Next, one end 31 a of the movable iron piece 31 of the rotating block 30 is attracted to the wide portion 26 of the yoke 25, and the other end 32 b of the movable iron piece 32 is attracted to the wide portion 28 of the yoke 27. For this reason, even if the application of the voltage to the coil 23 is stopped, the position of the card 40 is fixed, and the

movable contacts

56 and 57 and the fixed

contacts

52 and 53 are kept in contact with each other. In this state, the distance between the drive protrusion 43 and the return elastic tongue 67b is smaller than the distance between the drive protrusion 44 and the return elastic tongue 67c.

Next, when a voltage in the opposite direction to that described above is applied to the coil 23, one end portion 32 a of the movable iron piece 32 is attracted to the wide portion 26 of the yoke 25, and the other end portion 31 b of the movable iron piece 31 is attracted to the width of the yoke 27. Sucked into the wide portion 28. 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, after the driving projection 43 contacts the return elastic tongue 67b of the third conductive thin plate spring 67, the drive protrusion 44 contacts the return elastic tongue 67c. That is, a process of shifting from the state where the

movable contacts

56, 57 and the fixed

contacts

52, 53 are in contact with each other to the state where the

movable contacts

56, 57 and the fixed

contacts

52, 53 are separated from each other. , The card 40 is temporarily brought into contact with the movable contact piece 60, and not only a tensile force but also a torsional moment acts on the third conductive thin plate spring 67. As a result, after the movable contact 56 is separated from the fixed contact 52, the movable contact 57 is separated from the fixed contact 53.
Therefore, 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. 10 and 11, the second embodiment is substantially the same as the first embodiment described above, except that the driving

protrusions

43 and 44 of the T-shaped card 40 have the same shape. And the bending angle of the pair of return

elastic tongues

67b and 67c provided at the front edge of the third conductive thin plate spring 67 is different (FIG. 11B).
Therefore, even when the driving projection 44 of the card 40 comes into contact with the return elastic tongue 67c of the third conductive thin plate spring 67 during the return shown in FIGS. The driving protrusion 43 is not in contact with the return elastic tongue 67 b of the third conductive thin plate spring 67.

As in the first embodiment, when the electromagnet block 20 is excited to rotate the rotating block 30 and the card 40 is slid, the operation of the second embodiment is performed via the first conductive thin plate spring 61. Thus, the

movable contacts

56 and 57 are in contact with the fixed

contacts

52 and 53 simultaneously.

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, after the driving protrusion 43 of the card 40 abuts on the return elastic tongue 67c of the third conductive thin plate spring 67, the drive protrusion 44 returns to the return elastic elasticity of the third conductive thin plate spring 67. A torsional moment is applied to the entire movable contact piece 60 by contacting the tongue piece 67b. For this reason, the card 40 comes into contact with the movable contact piece 60, and not only a tensile force but also 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.

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

10: Box-shaped base 11: Insulating wall 11a: Notch for operation 12: First recess 13: Second recess 15a, 15b: Terminal groove 16: Bearing portion 17a, 17b: Positioning recess 18: Notch step portion 20: Electromagnet block 21: Spool 22a, 22b: collar part 23: coil 24: iron core 25, 27: yoke 26, 28: wide part 29: coil terminal 30: rotating block 31, 32: movable iron piece 33: times Moving block body 34a, 34b: Rotating shaft portion 35: Driving arm portion 36: Engaging claw portion 40: Card 41: Driving hole 42: Engaging hole 43, 44: Driving projection 45: Full safe projection 50: Contact mechanism 51: Fixed contact terminal 52, 53: Fixed contact 54: Movable contact terminal 55: Operation hole 56, 57: Movable contact 60: Movable contact piece 61: First guide Electric thin plate springs 62a, 62b: slits for adjusting spring constants 63a, 63b, 63c: curved portions 64a: elastic tongue pieces for driving 64b, 64c: elastic tongue pieces for reinforcement 65: second conductive thin plate springs 66b, 66c: position Restricting elastic tongue 67: Third conductive thin plate spring 67a: Position restricting elastic tongue 67b, 67c: Return elastic tongue 70: Support plate 71: Bearing hole 72: Positioning square hole 80: Cover 81: Elasticity Locking 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 pair of driving protrusions protruding in opposite directions from adjacent corners on one end side of the card, and cut out from the free end of the movable contact piece, and arranged so as to be able to contact the driving protrusions, respectively. A distance between one of the driving protrusions and one of the return elastic tongues in a state where the movable contact and the fixed contact are in contact with each other. Is smaller than the distance between the other driving projection and the other return elastic tongue.
In the process of shifting from the state in which the movable contact and the fixed contact are in contact to the state in which they are separated, one of the driving protrusions and one of the return elastic tongues are in contact, The contact mechanism according to claim 1, wherein the other driving protrusion and the other return elastic tongue are separated from each other.
3. The contact mechanism according to claim 1, wherein the pair of driving protrusions of the card have different shapes, and the pair of return elastic tongues of the movable contact piece have the same shape. Department.
3. The contact mechanism according to claim 1, wherein the pair of driving protrusions of the card have the same shape, and the pair of return elastic tongues of the movable contact piece have different shapes. Department.
The 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. The contact mechanism part of Claim 1.
An electromagnetic relay comprising the contact mechanism according to any one of claims 1 to 5.