JP2022144146A - electromagnetic relay - Google Patents

Abstract

To provide an electromagnetic relay that suppresses transmission of vibration to a bobbin even when a movable armature of an electromagnet repeatedly contacts an iron core.SOLUTION: An electromagnet 2 includes a core 6 having one end 6a fixed to a core fixing portion 5a of a yoke 5, a bobbin 7 attached to the outside of the iron core, an exciting coil 8 wound around the bobbin, and a movable armature 11 fixed to an armature fixing portion 5b of the yoke and arranged opposite to the other end 6b of the core. Due to the exciting operation of the exciting coil, the movable armature is attracted to the other end of the iron core and comes into contact with the other end, and a contact portion 3 opens and closes in conjunction with the operation of the movable armature. Bobbin restraining means for restraining the movement of the bobbin in the axial direction of the core is provided on the other end side of the core. The bobbin restraining means includes an annular groove 6d formed on the outer circumference of the core on the other end side and an E-shaped retaining ring 22 fitted in this annular groove.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay in which a movable armature of an electromagnet performs a contacting/separating operation with respect to an iron core, and a contact portion performs an opening/closing operation in conjunction with the movable armature.

For example, as shown in Patent Documents 1 and 2, this type of electromagnetic relay includes an iron core having one end fixed to a yoke, a bobbin attached to the outside of the iron core, and an exciting relay formed by winding a coil winding around the bobbin. An electromagnet having a coil and a movable armature fixed to a yoke and arranged opposite to the other end of an iron core is provided. Then, when the movable armature is attracted to the other end of the iron core by the excitation of the excitation coil and comes into contact with the other end, the contact portion opens and closes in conjunction with the movement of the movable armature.

JP 2020-30904 A Japanese Patent No. 4826618

By the way, in the above-described electromagnet, the impact force is transmitted to the bobbin when the movable armature contacts the other end of the iron core. The bobbin vibrates easily. If the bobbin is repeatedly vibrated by such contact operation of the movable armature with respect to the iron core, there is a risk that part of the coil winding wound around the bobbin that constitutes the exciting coil will break.

Therefore, the present invention has been made in view of the above circumstances, and suppresses the transmission of vibration to the bobbin even if the movable armature of the electromagnet repeatedly contacts the iron core, thereby preventing the coil winding wound around the bobbin. An object of the present invention is to provide an electromagnetic relay that does not affect wires and has a long life.

In order to achieve the above object, an electromagnetic relay according to an aspect of the present invention includes an electromagnet and a contact portion that performs opening/closing operation by exciting operation of the electromagnet. The electromagnet consists of a core whose one end is fixed to the core fixing portion of the yoke, a bobbin attached to the outside of the core, an excitation coil wound around the bobbin, and the other end of the core fixed to the armature fixing portion of the yoke. and a movable armature arranged opposite to the Then, due to the excitation operation of the exciting coil, the movable armature is attracted to the other end of the iron core and comes into contact with it, and the contact portion performs opening/closing operation in conjunction with the operation of the movable armature. A bobbin restraining means for restraining the movement of the bobbin in the axial direction of the core is provided on the other end side of the core.

According to the electromagnetic relay of the present invention, even if the movable armature of the electromagnet repeatedly contacts the iron core, the vibration transmission to the bobbin is suppressed, and the coil winding wound around the bobbin is not affected by the vibration. , a long service life can be achieved.

1 is a side view showing an electromagnetic relay according to an embodiment of the present invention with a cover removed; FIG. FIG. 4 is a diagram showing an E-shaped retaining ring attached to the iron core of an electromagnet of one embodiment; FIG. 3 is a view taken along line III-III in FIG. 2; It is a figure which shows the state which the E-shaped retaining ring with which the iron core of the electromagnet of 1 Embodiment was mounted|worn is pressing the bobbin.

Next, embodiments according to the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between thickness and planar dimension, the ratio of thickness of each layer, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined with reference to the following description. In addition, it is a matter of course that there are portions with different dimensional relationships and ratios between the drawings.

Further, the embodiments shown below are examples of devices and methods for embodying the technical idea of the present invention. etc. are not specified below. Various modifications can be made to the technical idea of the present invention within the technical scope defined by the claims.

FIG. 1 is a side view showing an electromagnetic relay 1 according to one embodiment of the present invention with a cover (not shown) removed.

An electromagnetic relay 1 of this embodiment includes an electromagnet 2 and contact portions 3 .

The electromagnet 2 consists of a plate-shaped yoke 5 that is fixed to a main body base 4 made of an insulator and bent into a substantially U shape when viewed from the side, and an iron core 6 having one end 6a fixed to an iron core fixing portion 5a of the yoke 5. and a bobbin 7 coaxially attached to the outside of the iron core 6. - 特許庁The electromagnet 2 includes an exciting coil 8 wound around a bobbin 7, a coil terminal 10 fixed to the body base 4 and connected to the coil winding of the exciting coil 8 via a lead wire 9a, and a yoke at one end. The movable armature 11 is fixed to the armature fixing portion 5b of 5 and the other end side contacts the other end 6b of the iron core 6 by a hinge operation, and the movable armature 11 is biased in a direction to separate from the other end 6b of the iron core 6. a return spring 12;

The contact portion 3 is fixed to the movable armature 11 of the electromagnet 2 via a movable contact base 15 made of an insulator. and movable contacts 17 and 18 provided on both sides of the tip of the movable leaf spring 16 . The contact portion 3 is fixed to the main body base 4, and is fixed to the main body base 4 by a movable contact terminal 19 electrically connected to a multipolar movable leaf spring 16 via a plurality of lead wires 9b. , fixed contact terminals 20 and 21 with fixed contacts 20a and 21a opposed to movable contacts 17 and 18 with a plurality of poles.

2 to 4 show the structure of the electromagnet 2. FIG.

As shown in FIG. 3, the bobbin 7 includes a central cylindrical portion 7a through which the iron core 6 is inserted, a lower flange portion 7b projecting radially outward from the lower end of the central cylindrical portion 7a, and an upper end of the central cylindrical portion 7a. and an upper flange portion 7c projecting radially outwardly from the portion. An exciting coil 8 such as a coil wire having a diameter of about 30 μm is wound in a coil storage space formed by the central cylindrical portion 7a, the lower flange portion 7b and the upper flange portion 7c of the bobbin 7. As shown in FIG.

The iron core 6 has a yoke insertion portion 6c formed on one end 6a side and an annular groove 6d formed on the other end 6b side. A through hole 5c is formed in the iron core fixing portion 5a of the yoke 5. As shown in FIG.

The iron core 6 inserted through the central cylindrical portion 7a of the bobbin 7 is inserted into the through hole 5c of the yoke 5 at the yoke insertion portion 6c on the one end 6a side. By crimping the end portion of the yoke insertion portion 6c, the end portion of the yoke insertion portion 6c is plastically deformed to have a larger diameter than the through hole 5c, and the one end 6a side of the iron core 6 is attached to the iron core fixing portion 5a of the yoke 5. Fixed.

As shown in FIG. 2, an E-shaped retaining ring 22 is attached to the annular groove 6d on the other end 6b side of the iron core 6. As shown in FIG.

The E-shaped retaining ring 22 is a substantially E-shaped member having three first to third engaging rods 22a, 22b, and 22c by forming a flat metal plate into a substantially E-shaped configuration. The E-shaped retaining ring 22 is elastically deformed in the direction in which the first and second engaging rods 22a, 22b are separated from each other, and moves to the outer peripheral position of the annular groove 6d. are elastically restored, the insides of the first and second engaging rods 22a and 22b and the tip of the third engaging rod 22c are engaged with the annular groove 6d.

As shown in FIG. 4, the E-shaped retaining ring 22 of this embodiment has the upper flange portion 7c of the bobbin 7 on the outer edge side that does not engage with the annular groove 6d of the first to third engaging rods 22a, 22b, and 22c. (Although not shown, the first engaging rod 22a is also formed with a first protrusion 23 that contacts the upper flange portion 7c.). Further, as shown in FIG. 2, the first to third engaging rods 22a, 22b, and 22c are formed with curved second protrusions 24 on the other sides of the first protrusions 23 in the thickness direction. ing.

As shown in FIG. 4, the first projecting portion 23 of the first to third engaging rods 22a, 22b, 22c of the E-shaped retaining ring 22 mounted in the annular groove 6d of the iron core 6 is located on the upper flange portion 7c of the bobbin 7. abut on.

The E-shaped snap ring 22 is fixed to the other end 6b side of the iron core 6 by engaging the tips of the first to third engagement rods 22a, 22b, 22c with the annular groove 6d. Further, the E-shaped retaining ring 22 holds the bobbin 7 at one end of the iron core 6 by contacting the upper flange portion 7c of the bobbin 7 with the first protrusions 23 of the first to third engaging rods 22a, 22b, and 22c. A pressing force F acts in the direction toward the iron core fixing portion 5a of the yoke 5 to which the yoke 6a is fixed.

Next, the operation and effects of the electromagnetic relay 1 of this embodiment will be described.

When the excitation coil 8 is de-energized, as shown in FIG. 1, the movable contact 17 and the fixed contact 20a of the contact portion 3 are in contact, and the fixed contact terminal 20 and the movable contact terminal 19 are electrically connected.

When the exciting coil 8 is excited, the movable armature 11 is attracted to the other end 6b of the iron core 6 by hinge operation against the spring force of the return spring 12 and comes into contact therewith. With the hinge operation of the movable armature 11, the movable leaf spring 16 fixed to the movable armature 11 via the movable contact base 15 is also interlocked, whereby the movable contact 17 is separated from the fixed contact 20a, and the movable contact 20a is moved. Contact 18 contacts fixed contact 21a. As a result, the fixed contact terminal 21 and the movable contact terminal 19 are connected. Then, when the excitation coil 8 is de-excited again, the action of the return spring 12 restores the state shown in FIG.

Here, the exciting coil 8 is excited, and the collision force is transmitted to the bobbin 7 when the movable armature 11 contacts the other end 6 b of the iron core 6 .

The E-shaped retaining ring 22 mounted in the annular groove 6d of the iron core 6 abuts on the upper flange portion 7c of the bobbin 7 at the first protrusions 23 formed on the first to third engagement rods 22a, 22b, and 22c. Thus, the bobbin 7 is fixed by applying a pressing force F in the direction toward the iron core fixing portion 5a of the yoke 5. As shown in FIG.

In this manner, the bobbin 7 is fixed in a state of being pressed in the direction toward the core fixing portion 5a of the yoke 5 by the E-shaped retaining ring 22 attached to the core 6, so that the movable armature 11 is attached to the core 6. Even if the impact force when contacting the end 6b is transmitted, it is less likely to be transmitted as vibration.

Therefore, in the electromagnetic relay 1 of the present embodiment, even if the movable armature 11 of the electromagnet 2 repeatedly contacts the other end 6b of the iron core 6, the transmission of vibration to the bobbin 7 can be suppressed. It is possible to prevent the excitation coil 8 wound around 7 from being adversely affected. Therefore, it is possible to provide the electromagnetic relay 1 having a long life.

Further, the bobbin 7 does not vibrate even if an external force is applied to the bobbin 7 from the outside of the electromagnetic relay 1, not limited to the case where the movable armature 11 of the electromagnet 2 repeatedly contacts the other end 6b of the iron core 6. It is possible to prevent the excitation coil 8 wound around the bobbin 7 from being adversely affected.

Further, the E-shaped retaining ring 22 is attached to the annular groove 6d of the iron core 6, and the first projecting portions 23 of the first to third engaging rods 22a, 22b, 22c are brought into contact with the upper flange portion 7c of the bobbin 7. , the bobbin 7 can be fixed by applying the pressing force F in the direction toward the iron core fixing portion 5a of the yoke 5, so that the electromagnet 2 can be easily assembled.

Furthermore, since the E-shaped retaining ring 22 is a member having the first projection 23 formed on one surface (front surface) and the second projection 24 formed on the other surface (back surface), the E-shaped retaining ring 22 can be The electromagnet 2 can be mounted in the annular groove 6d of the iron core 6 without considering the orientation of the electromagnet 2, and the assembling work of the electromagnet 2 can be easily performed.

In this embodiment, the E-shaped snap ring 22 is used, but if it is easy to attach to the annular groove 6d of the iron core 6 and has a structure in which the first and second protrusions 23 and 24 are formed on the front and back sides, , a C-shaped retaining ring may be used.

1 electromagnetic relay 2 electromagnet 3 contact portion 4 body base 5 yoke 5a iron core fixing portion 5b armature fixing portion 5c through hole 6 iron core 6a one end 6b of iron core other end 6c yoke insertion portion 6d annular groove 7 bobbin 7a central cylindrical portion 7b Lower flange portion 7c Upper flange portion 8 Exciting coils 9a, 9b Lead wire 10 Coil terminal 11 Movable armature 12 Return spring 15 Movable contact base 16 Movable plate springs 17, 18 Movable contact 19 Movable contact terminals 20, 21 Fixed contact terminal 20a, 21a fixed contact 22 E-shaped retaining ring 22a first engaging rod 22b second engaging rod 22c third engaging rod 23 first projection (projection)
24 second projection (projection)

Claims (6)

An electromagnet and a contact portion that performs opening and closing operations by exciting the electromagnet,
The electromagnet includes a core fixed at one end to a core fixing portion of a yoke, a bobbin mounted outside the core, an excitation coil wound around the bobbin, and fixed to an armature fixing portion of the yoke. and a movable armature arranged opposite to the other end of the iron core,
Due to the exciting operation of the exciting coil, the movable armature is attracted to the other end of the iron core and comes into contact with the movable armature, and the contact portion performs opening and closing operations in conjunction with the operation of the movable armature,
An electromagnetic relay, wherein bobbin restraining means for restraining movement of the bobbin in the axial direction of the iron core is provided on the other end side of the iron core. The bobbin restraint means
an annular groove formed on the outer periphery of the core on the other end side;
2. A ring-shaped member that is mountable in the annular groove and presses the bobbin toward the iron core fixing portion when mounted in the annular groove. electromagnetic relay. 3. The electromagnetic relay according to claim 2, wherein said ring-shaped member is an E-shaped snap ring fitted in said annular groove and provided with a projection for pressing said bobbin against said iron core fixing portion. 4. The electromagnetic relay according to claim 3, wherein said protrusions are provided on both the front surface and the rear surface of said E-shaped retaining ring. 3. The electromagnetic relay according to claim 2, wherein said ring-shaped member is a C-shaped snap ring fitted in said annular groove and provided with a projection for pressing said bobbin against said iron core fixing portion. 6. The electromagnetic relay according to claim 5, wherein the protrusions are provided on both the front surface and the back surface of the C-shaped retaining ring.

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