JP2002245917A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a silent electromagnetic relay having a small number of parts and man-hours for assembly and allowing easy designing to provide stable operating characteristics. SOLUTION: A damping spring part 42 for operation which abut on the sucking surface edge part of a moving iron 30 during the operation is extended from a support spring 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silent electromagnetic relay in which sound generated during operation and recovery is reduced.

[0002]

2. Description of the Related Art Conventionally, as a silent type electromagnetic relay for reducing a collision sound of a movable part at the time of operation and return, for example, a damping material is used or a case has a double structure. There is something. However, these methods not only complicate the structure, but also require special materials, complicate the manufacturing process, and increase the manufacturing cost. For this reason, in order to solve the above-mentioned problem, for example, Japanese Unexamined Patent Application Publication No. 8-69737 discloses a silencer for a small relay.

However, in the above-described noise reduction device, the operation noise and the return noise are absorbed by attaching separate elastic members to each other, so that the number of parts and the number of assembly steps are large. Also,
During operation, an elastic member that absorbs operation noise is held between the iron core and the movable iron piece. Therefore, the movable iron piece is likely to vibrate due to an external impact force, and the operating characteristics are likely to be unstable. Further, since the elastic member is sandwiched between the iron core and the movable iron piece, the stroke and the contact follow of the movable iron piece are affected. For this reason, these must be considered as design items, and there is a problem that it takes time to design.

The present invention has been made in view of the above problems, and has a problem in that the number of parts,
An object of the present invention is to provide a silent electromagnetic relay that requires a small number of assembling steps and is easily designed having stable operation characteristics.

[0005]

According to the present invention, there is provided an electromagnetic relay for exciting an electromagnet block to achieve the above object.
Based on the demagnetization, the movable iron piece rotatably supported by the support spring is attracted to and separated from the magnetic pole of the iron core to drive the contact mechanism, and contacts the edge of the attracting surface of the movable iron piece during operation. The buffer cushion for operation is configured to extend from the support spring.

According to the present invention, since the buffer spring for operation extends from the support spring, an electromagnetic relay having a small number of parts and a small number of assembly steps can be obtained. Further, since the movable iron piece is directly attracted to the magnetic pole portion of the iron core during operation, the movable iron piece is less likely to be separated from the magnetic pole portion by an external impact force, and an electromagnetic relay having excellent shock resistance and vibration resistance can be obtained. Further, since the stroke of the movable iron piece and the follow of the movable contact piece do not change as in the conventional example, an electromagnetic relay that is easy to design can be obtained.

In another embodiment, a buffer spring for restoring, which comes into contact with the surface of the movable iron piece at the time of restoring to absorb and reduce impact energy, may extend from the support spring. According to the present embodiment, since the buffer spring for return also extends from the support spring, an electromagnetic relay having a small number of parts and a small number of assembly steps can be obtained.

In another embodiment, an elastic claw portion which is positioned in contact with a fixing member constituting the electromagnet block may be formed at the tip of the shock absorbing spring for operation. According to the present embodiment, the elastic claws are positioned by contacting the fixing members constituting the electromagnet block. For this reason, the position accuracy of the elastic claw portion abutting on the suction surface of the movable iron piece is high. As a result, there is no variation in the contact position of the elastic claw portion with the movable iron piece, and there is an effect that operating characteristics are stabilized.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to the accompanying drawings of FIGS. As shown in FIGS. 1 and 2, a first embodiment according to the present invention includes a base 10 and an electromagnet block 2 erected on the base 10.
0, a movable iron piece 30 rotatably supported by the electromagnet block 20 via a support spring 40, and a movable iron piece 3
And a contact mechanism 50 driven to zero.

In the electromagnet block 20, an iron core 23 is inserted into a center hole of a spool 22 around which a coil 21 is wound, and one end of the protruding iron core 23 is used as a magnetic pole part 24.
A substantially L-shaped yoke 25 is caulked and fixed to the other end protruding.

The movable iron piece 30 is formed by bending a thick plate into a substantially rectangular shape, and is rotatably supported by a top end of the yoke 25 via a support spring 40.

The support spring 40 is fixed to the vertical surface of the yoke 25 by caulking. As shown in FIG. 2, a thin spring material is stamped out and pressed. The support spring 40 has a buffer spring portion 42 for operation and a buffer spring portion 43 for return extending substantially in parallel with a hinge spring portion 41 extending from the center of the upper edge of the support spring 40 therebetween. An elastic claw portion 44 is formed by bending the distal end of the operation-time buffer spring portion 42 into a substantially U-shape so as to be engaged with the distal end edge 31 of the suction surface of the movable iron piece 30. Also,
The restoring buffer spring 43 is provided with the movable iron piece 30 during restoring.
Is bent so as to come into contact with the upper surface of the.

The contact mechanism 50 includes the movable iron piece 30
A fixed contact piece 55 having a movable contact piece 52 that rotates via a card 51 locked near the lower end 32 of the movable contact piece 52, and a fixed contact 54 that is detachably opposed to a movable contact 53 provided on the movable contact piece 52. And is composed of

Next, the operation of the electromagnetic relay having the above configuration will be described. Coil 21 of electromagnet block 20
When no voltage is applied to the movable iron piece 30, the vicinity of the lower end 32 of the movable iron piece 30 is pressed by the spring force of the movable contact piece 52. Therefore, the attracting surface of the movable iron piece 30 is separated from the magnetic pole portion 24 of the iron core 23, and the movable contact 53 is separated from the fixed contact 54.

When a voltage is applied to the coil 21, the attracting surface of the movable iron piece 30 is attracted to the magnetic pole portion 24 of the iron core 23 against the spring force of the movable contact piece 52, and the upper end edge of the yoke 25 is moved. It turns as a fulcrum. Therefore, the card 51
After the movable contact piece 52 is pressed via the contact and the movable contact 53 contacts the fixed contact 54, the movable iron piece 30 further rotates. On the other hand, immediately before the adsorbing surface of the movable iron piece 30 contacts the magnetic pole portion 24 of the iron core 23, the movable iron piece 30 contacts the elastic claw portion 44 of the buffer cushion for operation 42 to absorb and reduce the impact energy. For this reason, the movable iron piece 30 gently contacts the magnetic pole part 24, and the operation noise is reduced.

Then, when the application of the voltage of the coil 21 is stopped, the vicinity of the lower end 32 of the movable iron piece 30 is pushed back and rotated based on the spring force of the movable contact piece 52. Therefore, after the attraction surface of the movable iron piece 30 is separated from the magnetic pole part 24, the movable contact 53 is separated from the fixed contact 54. Further, the movable iron piece 30 that continues to rotate comes into contact with the buffer spring portion 43 at the time of the return of the support spring 40, and the impact energy is absorbed and reduced. For this reason, the lower end 32 of the movable iron piece 30
Does not collide with the side surface of the yoke 25, and the return sound is reduced.

The support spring is not limited to the above-described embodiment, as in the second embodiment shown in FIG. 3, but extends from the center of the upper edge of the support spring 40 to the buffer cushion 42 for operation. The return buffer springs 43 may be extended to both sides. Conversely, as in the third embodiment shown in FIG. 4, the return-time buffer spring 43 extends from the center of the upper end edge of the support spring 40, and the operation-use buffer springs 42 are provided on both sides thereof. , 42 may be extended. According to the above-described embodiment, the operation-time buffer spring 42 or the return buffer spring 43 also functions as a hinge spring portion.
There is an advantage that the shape is simplified.

As shown in FIG. 5, the support spring 40 has a hinge spring 41 extending from the center of the upper end edge of the support spring 40 and a substantially U-shaped connecting portion 45. It may extend. A return-time buffer spring 43 extends from the center of the leading edge of the connecting portion 45, and operation-time buffer springs 42 extend on both sides thereof. Conversely, as in the fifth embodiment shown in FIG. 6, the buffer cushion for operation 42 extends from the center of the distal end edge of the connecting portion 45, and the buffer springs for return are provided on both sides thereof. 43, 43 may be extended.

Further, as in the sixth embodiment shown in FIG. 7, the support spring 40 has a hinge spring portion 41 extending from the center of the upper edge of the support spring 40 and a buffer spring portion for returning from the tip thereof. 43 may be extended, and the operating shock-absorbing spring portion 42 may be extended from the end thereof.

As shown in FIGS. 8 and 9, the seventh embodiment is substantially the same as the first embodiment described above, except for the mounting structure of the support spring 40. For this reason, the same components are denoted by the same reference numerals and description thereof will be omitted. That is, the support spring 40 according to the present embodiment
Are fitted and engaged with a pair of engagement receiving portions 27 protruding from the flange portion 26. The support spring 40 has engaging claw portions 46, 46 formed symmetrically from both side edges, and a hinge spring portion 41 extending from one end side edge thereof, while a buffer spring for operation from the other end side edge. The section 42 and the return buffer spring section 43 extend substantially in parallel. Further, an elastic claw portion 44 is formed by bending the distal end portion of the operating shock absorbing spring portion 42 into a substantially U-shape so as to engage with the distal end portion 31 of the suction surface of the movable iron piece 30. Is

Therefore, when no voltage is applied to the coil 21 of the electromagnet block 20, the movable contact piece 5
The vicinity of the lower end 32 of the movable iron piece 30 is pressed by the spring force of 2. Therefore, the attracting surface of the movable iron piece 30 is separated from the magnetic pole portion 24 of the iron core 23, and the movable contact 53 is separated from the fixed contact 54.

When a voltage is applied to the coil 21, the attracting surface of the movable iron piece 30 is attracted to the magnetic pole portion 24 of the iron core 23 against the spring force of the movable contact piece 52, and the upper end edge of the yoke 25 is moved. It turns as a fulcrum. Therefore, the card 51
Then, the movable contact piece 52 is pressed via the contact, so that the movable contact piece 52 rotates and the movable contact 53 contacts the fixed contact 54, and then the movable iron piece 30 further rotates. On the other hand, immediately before the attraction surface of the movable iron piece 30 abuts on the magnetic pole part 24 of the iron core 23, it comes into contact with the elastic claw part 44, and the impact energy is absorbed and reduced. For this reason, the movable iron piece 30 gently contacts the magnetic pole part 24, and the operation noise is reduced.

When the application of the voltage to the coil 21 is stopped, the vicinity of the lower end 32 of the movable iron piece 30 is pushed back and rotated based on the spring force of the movable contact piece 52. Therefore, after the attraction surface of the movable iron piece 30 is separated from the magnetic pole part 24, the movable contact 53 is separated from the fixed contact 54. Further, the movable iron piece 30 continues to rotate, but the support spring 40
Abuts against the buffer spring portion 43 at the time of return, and the impact energy is absorbed and reduced. For this reason, the lower end 3 of the movable iron piece 30
2 does not collide with the side surface of the yoke 25, and the return sound is reduced.

The support spring 40 is not limited to the above-described seventh embodiment as in the eighth embodiment shown in FIG.
And a buffer spring portion 4 for return at both sides thereof.
3, 43 may be extended. Conversely, as in the ninth embodiment shown in FIG. 11, the return-time buffer spring 43 extends from the center of the upper end edge of the support spring 40, and the operation-purpose buffer springs 42 are provided on both sides thereof. , 42 may be extended.

Further, as in the tenth embodiment shown in FIG. 12, the support spring 40 extends from the center of the edge on the other end side of the support spring 40 with the buffer spring 43 for return.
This is a case where the substantially U-shaped connecting portion 45 is extended. An operating shock-absorbing spring 42 extends from the center of the leading edge of the connecting portion 45.

Further, as in the eleventh embodiment shown in FIG. 13, the support spring 40 has a return-time buffer spring 43 extending from the center of the other end side edge portion. The spring 42 may be extended.

The buffer spring 42 for the operation of the support spring 40
The elastic claw portion 44 is not limited to that of the above-described first to eleventh embodiments. For example, as shown in a twelfth embodiment of FIG. May be used. According to the present embodiment, the elastic claw portion 44 abuts against the flange portion 26 and is accurately positioned, and the positioning accuracy is high. For this reason, there is an advantage that variations in operating characteristics can be eliminated. Other configurations are the same as those of the above-described embodiment, and the description is omitted. In addition, the elastic claw portion 44 is not limited to the case where the elastic claw portion abuts on the flange portion 26 of the spool 22, but may of course be configured to abut another fixed component.

[0028]

FIG. 8 is a perspective view of the seventh embodiment shown in FIG. 9 and FIG.
Regarding the electromagnetic relay according to the twelfth embodiment, the frequency characteristics of the operation sound and the return sound were measured by the FFT analyzer. Further, for comparison, an electromagnetic relay in which a support spring without the operation-time buffer spring portion and the return-time buffer spring portion was assembled was used as a conventional example, and the measurement was performed in the same manner as described above. The measurement results are shown in FIGS. As is clear from FIGS. 15 and 16, when the present embodiment is compared with the conventional example, it is found that both the operation sound and the return sound are at least 10 dB or more, and the present embodiment is lower than the conventional example. .

[0029]

According to the present invention, since the buffer spring for operation extends from the support spring, an electromagnetic relay having a small number of parts and a small number of assembly steps can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of an electromagnetic relay according to the present invention.

2 shows a partially enlarged view of the electromagnetic relay shown in FIG. 1, wherein FIG. 2 (A) is an enlarged perspective view of a main part, and FIG. 2 (B) is an enlarged perspective view of a hinge spring alone.

FIG. 3 is a perspective view showing a hinge spring according to a second embodiment.

FIG. 4 is a perspective view showing a hinge spring according to a third embodiment.

FIG. 5 is a perspective view showing a hinge spring according to a fourth embodiment.

FIG. 6 is a perspective view showing a hinge spring according to a fifth embodiment.

FIG. 7 is a perspective view showing a hinge spring according to a sixth embodiment.

FIG. 8 is a front view showing an electromagnetic relay according to a seventh embodiment.

9 is a partially enlarged view of the electromagnetic relay shown in FIG. 8, wherein FIG. 9A is an enlarged perspective view of a main part, and FIG. 9B is an enlarged perspective view of a hinge spring alone.

FIG. 10 is a perspective view showing a hinge spring according to an eighth embodiment.

FIG. 11 is a perspective view showing a hinge spring according to a ninth embodiment.

FIG. 12 is a perspective view showing a hinge spring according to a tenth embodiment.

FIG. 13 is a perspective view showing a hinge spring according to an eleventh embodiment.

FIG. 14 is an enlarged view for explaining the operation of the electromagnetic relay according to the twelfth embodiment, where FIG. 14A is a partially enlarged view before operation and FIG. 14B is a partially enlarged view after operation. is there.

FIG. 15 is a graph showing operation sounds of the embodiment and the conventional example.

FIG. 16 is a graph showing return sounds of the embodiment and the conventional example.

[Explanation of symbols]

10 ... base, 20 ... electromagnet block, 21 ... coil,
Reference numeral 22: spool, 23: iron core, 24: magnetic pole portion, 25: yoke, 26: flange portion, 27: engagement receiving portion, 30: movable iron piece, 40: support spring, 41: hinge spring portion, 42: for operation Buffer spring part, 43 ... Buffer spring part for return, 44 ... Elastic claw part, 45 ... Connection part, 46 ... Engagement claw part, 50 ... Contact mechanism part, 51 ... Card, 52 ... Movable contact piece, 53 ... Movable Contacts, 54: fixed contact, 55: fixed contact piece.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tatsunori Hotta 801 Shidokoro Shiorikyo-dori Horikawa-Higashi-iri Minamifudo-cho, Shimogyo-ku, Kyoto Omron Corporation

Claims (3)

[Claims] 1. Based on excitation and demagnetization of an electromagnet block,
In an electromagnetic relay in which a movable iron piece rotatably supported by a support spring is attracted to and separated from a magnetic pole of an iron core to drive a contact mechanism portion, an operation buffer that abuts on an attraction edge of the movable iron piece during operation. An electromagnetic relay, wherein a spring portion extends from the support spring. 2. The electromagnetic relay according to claim 1, wherein a buffer spring portion for restoring, which abuts on the surface of the movable iron piece at the time of restoring to absorb and reduce impact energy, extends from the support spring. 3. An elastic claw portion, which is positioned at the tip of the operating shock-absorbing spring in contact with a fixing member constituting the electromagnet block, is formed.
Electromagnetic relay according to the item.