JP2023128904A - electromagnetic relay - Google Patents

Abstract

To provide an electromagnetic relay which allows improvement in positioning accuracy of a hinge spring.SOLUTION: An electromagnetic relay comprises a base, an electromagnet device, a movable iron piece, a hinge spring, and a locking part. The electromagnet device is supported by the base. The electromagnet device includes a yoke disposed around a coil. The movable iron piece is disposed so as to face the electromagnet device. The hinge spring energizes the movable iron piece in a direction away from the electromagnet device. When inserted into an insertion direction, the hinge spring is disposed between the base and the yoke. The locking part is provided on either the base or the yoke so as to lock the hinge spring. The yoke includes at least one stopper part. The stopper part is located in the insertion direction with respect to the locking part so as to restrict a movement of the hinge spring in the insertion direction.SELECTED DRAWING: Figure 4

Description

The present invention relates to an electromagnetic relay.

Patent Document 1 discloses an electromagnetic relay including a base, a contact device, an electromagnet device, a movable iron piece, and a hinge spring. The hinge spring is inserted between the base and the electromagnetic device and is locked in the locking recess of the base. Thereby, the hinge spring is positioned on the base, and the movable iron piece is rotatably supported on the base via the hinge spring.

Japanese Patent Application Publication No. 2000-348590

In the electromagnetic relay disclosed in Patent Document 1, a hinge spring to which a movable iron piece is assembled is inserted between a base and an electromagnet device, and the hinge spring is assembled to the base. The hinge spring inserted between the electromagnetic device and the electromagnetic device is locked in the locking recess of the base and positioned on the base, but the hinge spring may penetrate too deep and the positioning accuracy of the hinge spring is low. If the hinge spring goes too deep, there is a risk that the hinge spring and the base will interfere and generate abrasion particles. Also, in order to prevent the hinge spring from going too deep, it is possible to press the hinge spring against the base and assemble the hinge spring to the base, but since the dimensional accuracy of the base is not achieved, the hinge spring is locked in the locking recess. There is a possibility that the hinge spring cannot be assembled to the base without being inserted until it is completely inserted.

An object of the present invention is to provide an electromagnetic relay that can improve the positioning accuracy of a hinge spring.

An electromagnetic relay according to one aspect of the present invention includes a base, an electromagnet device, a movable iron piece, a hinge spring, and a locking portion. An electromagnetic device is supported on the base. The electromagnetic device includes a yoke disposed around the coil. The movable iron piece is placed opposite the electromagnetic device. The hinge spring biases the movable iron piece away from the electromagnetic arrangement. The hinge spring is placed between the base and the yoke by being inserted from the insertion direction. The locking portion is provided on either the base or the yoke and locks the hinge spring. The yoke includes at least one stop portion. The at least one stopper portion is arranged in the insertion direction relative to the locking portion and limits movement of the hinge spring in the insertion direction.

In this electromagnetic relay, when the hinge spring is assembled to the base or the yoke, movement of the hinge spring in the insertion direction is restricted by at least one stopper portion. Thereby, when assembling the hinge spring to the base or the yoke, it is possible to prevent the hinge spring from going too deep into the base or the yoke. As a result, it is possible to improve the positioning accuracy of the hinge spring. Also, at least one stopper portion is provided on the yoke. For this reason, for example, compared to the case where at least one stopper part is provided on a resin-molded base, it is easier to achieve dimensional accuracy of at least one stopper part, and when there is interference between at least one stopper part and the hinge spring. The generation of wear particles can be suppressed.

The hinge spring may be separated from the stopper part in a state of being locked by the locking part. In this case, interference between the stopper portion and the hinge spring can be suppressed.

The at least one stopper section may include a plurality of stopper sections. The plurality of stopper parts may include a first stopper part and a second stopper part separated from the first stopper part in a direction intersecting the insertion direction. In this case, the movement of the hinge spring in the insertion direction is more likely to be restricted while suppressing the size of the stopper portion from increasing.

The locking portion may be arranged in line with the at least one stopper portion in the insertion direction. In this case, the positioning accuracy of the hinge spring can be further improved.

The stopper portion may have a protrusion shape. In this case, the stopper portion can be formed with a simple structure.

The stopper portion may have an arc shape. In this case, since the contact area between the stopper part and the hinge spring can be reduced, generation of abrasion powder when at least one stopper part and the hinge spring interfere can be suppressed.

A locking portion may be provided on the yoke. In this case, compared to the case where at least the engaging portion is provided on the resin-molded base, it is easier to achieve dimensional accuracy of the locking portion, and wear of the locking portion can be suppressed.

According to the present invention, it is possible to provide an electromagnetic relay that can improve the positioning accuracy of a hinge spring.

It is a perspective view of an electromagnetic relay. It is a side view of an electromagnetic relay. It is a bottom view of a yoke and a hinge spring. FIG. 3 is a partial cross-sectional view of the vicinity of the stopper portion. It is a perspective view of a hinge spring. It is a figure for explaining the modification of a locking part.

Embodiments of an electromagnetic relay according to one aspect of the present invention will be described below with reference to the drawings. In addition, in each drawing, description will be made assuming that the X1 direction is the left direction, the X2 direction is the right direction, the Y1 direction is the front direction, the Y2 direction is the rear direction, the Z1 direction is the upward direction, and the Z2 direction is the downward direction. These directions are defined for convenience of explanation, and do not limit the arrangement direction of the electromagnetic relay. In this embodiment, the front direction, which is the Y1 direction, is an example of the insertion direction Y1.

As shown in FIGS. 1 and 2, the electromagnetic relay 1 includes a base 2, a contact device 3, an electromagnet device 4, a movable iron piece 5, a hinge spring 6, and a card 7.

The base 2 is made of an insulating material such as resin. The base 2 is formed so that the dimension in the front-rear direction is larger than the dimension in the left-right direction. Note that the base 2 may have a dimension in the front-rear direction and a dimension in the left-right direction that is approximately the same, or a dimension in the left-right direction may be larger than a dimension in the front-rear direction.

The base 2 includes a bottom portion 21 and base side walls 22. The bottom portion 21 has a substantially rectangular shape when viewed from above and below. Base sidewall 22 extends upward from the outer edge of bottom 21 . The base side wall 22 includes a front wall 22a, a left wall 22b, and a right wall 22c. The front wall 22a extends in a direction intersecting the front-rear direction. The left wall 22b and the right wall 22c extend in a direction intersecting the left-right direction. The electromagnetic relay 1 includes a case (not shown) that is placed over the base 2 from above.

The contact device 3 is mounted on the base 2. The contact device 3 is supported by the base 2. The contact device 3 is arranged in front of the electromagnet device 4.

The contact device 3 includes a first fixed terminal 8, a second fixed terminal 9, and a movable contact piece 10. The first fixed terminal 8, the second fixed terminal 9, and the movable contact piece 10 are plate-shaped terminals, and are made of a conductive material.

The first fixed terminal 8 is supported by the base 2. The first fixed terminal 8 passes through the bottom portion 21 of the base 2 in the vertical direction. The first fixed terminal 8 includes a first fixed contact 8a. The first fixed contact 8a is arranged on the rear surface of the first fixed terminal 8.

The second fixed terminal 9 is arranged behind the first fixed terminal 8. The second fixed terminal 9 is supported by the base 2. The second fixed terminal 9 passes through the bottom 21 of the base 2 in the vertical direction. The second fixed terminal 9 includes a second fixed contact 9a. The second fixed contact 9a is arranged on the front surface of the second fixed terminal 9.

The movable contact piece 10 is arranged between the first fixed terminal 8 and the second fixed terminal 9. The movable contact piece 10 is supported by the base 2. The movable contact piece 10 passes through the bottom 21 of the base 2 in the vertical direction. The movable contact piece 10 includes a first movable contact 10a and a second movable contact 10b. The first movable contact 10a is arranged opposite to the first fixed contact 8a and can come into contact with the first fixed contact 8a. The second movable contact 10b is arranged opposite to the second fixed contact 9a and can come into contact with the second fixed contact 9a.

The electromagnet device 4 moves the card 7 by electromagnetic force. The electromagnet device 4 is mounted on the base 2. The electromagnetic device 4 is supported by the base 2. The electromagnet device 4 is assembled to the base 2 from the rear of the base 2. The electromagnet device 4 includes a coil 41, a spool 42, an iron core 43, and a yoke 44.

The coil 41 is wound around the outer periphery of the spool 42. The spool 42 extends in the front-rear direction. The spool 42 includes a pedestal portion 42a arranged so as to be continuous with the rear end of the base 2. The iron core 43 has a cylindrical shape and is inserted into the inner circumference of the spool 42. The rear end of the iron core 43 is a magnetic pole surface, and is arranged to face the movable iron piece 5 in the front-back direction.

Yoke 44 is arranged around coil 41. The yoke 44 has a bent shape. The yoke 44 has a substantially L-shape and is formed, for example, by press working.

As shown in FIGS. 3 and 4, the yoke 44 includes a first plate portion 44a, a second plate portion 44b, a stopper portion 44c, and a stopper portion 44d.

The first plate portion 44a is arranged in front of the coil 41 and the spool 42. The first plate portion 44a extends in a direction intersecting the front-rear direction. The first plate portion 44a is fixed to the front end of the iron core 43.

The second plate portion 44b is bent rearward from the lower end of the first plate portion 44a. The second plate portion 44b is arranged below the coil 41. The second plate portion 44b extends in a direction intersecting the up-down direction. The second plate portion 44b faces the bottom portion 21 of the base 2 in the vertical direction. The second plate portion 44b is press-fitted into insertion grooves (not shown) formed in the left wall 22b and right wall 22c of the base 2. The insertion groove extends in the front-rear direction. The electromagnet device 4 is assembled to the base 2 by inserting the second plate portion 44b into the insertion groove from the rear of the base 2.

Each of the stopper portion 44c and the stopper portion 44d is an example of at least one stopper. That is, in this embodiment, the yoke 44 includes a plurality of stopper parts. The stopper part 44c is an example of a first stopper part. The stopper portion 44d is an example of a second stopper portion.

The stopper portions 44c and 44d limit movement of the hinge spring 6 in the insertion direction Y1. The stopper portions 44c and 44d are arranged at positions where the front end of the hinge spring 6 can come into contact with the hinge spring 6 when the hinge spring 6 is assembled to the base 2 and the yoke 44 from the insertion direction Y1.

The stopper portions 44c and 44d are formed on the lower surface of the second plate portion 44b. The stopper portions 44c and 44d are integral with the second plate portion 44b. The stopper portions 44c and 44d have a protrusion shape. The stopper portions 44c and 44d protrude downward from the lower surface of the second plate portion 44b. The stopper portions 44c and 44d have an arc shape. The stopper parts 44c and 44d are formed in a circular shape when viewed from below.

The stopper portion 44d is arranged apart from the stopper portion 44c in a direction intersecting the front-rear direction. The stopper portion 44c and the stopper portion 44d are arranged side by side in the left-right direction with an interval in the left-right direction. The stopper parts 44c and 44d are arranged in the insertion direction Y1 with respect to the locking parts 31 and 32, which will be described later. That is, the stopper parts 44c and 44d are arranged ahead of the locking parts 31 and 32.

Here, the electromagnetic relay 1 includes a locking portion 31 and a locking portion 32. That is, in this embodiment, the electromagnetic relay 1 includes a plurality of locking parts. The locking parts 31 and 32 are provided on either the base 2 or the yoke 44. In this embodiment, the locking parts 31 and 32 are provided on the second plate part 44b of the yoke 44. The locking parts 31 and 32 are formed on the lower surface of the second plate part 44b. The locking parts 31 and 32 lock the hinge spring 6. The locking portions 31 and 32 prevent the hinge spring 6 from coming off. That is, the locking portions 31 and 32 restrict movement of the hinge spring 6 in the direction opposite to the insertion direction Y1 (backward in this case). The locking parts 31 and 32 may have a function of positioning the hinge spring 6. Note that the number of locking portions may be one, as long as it corresponds to the number of locking claws described later.

The locking portions 31 and 32 have a shape that is concave from the bottom to the top. The locking portion 31 and the locking portion 32 are arranged side by side in the left-right direction with an interval in the left-right direction. The locking portion 31 is arranged behind the stopper portion 44c. The locking portion 31 is arranged in line with the stopper portion 44c in the front-rear direction. The locking portion 32 is arranged behind the stopper portion 44d. The locking portion 32 is arranged in line with the stopper portion 44d in the front-rear direction.

The movable iron piece 5 is arranged to face the electromagnet device 4 in the front-rear direction. The movable iron piece 5 is arranged behind the iron core 43. The movable iron piece 5 is rotatably supported by a hinge spring 6. The movable iron piece 5 is in contact with the rear end of the yoke 44 and rotates using the rear end of the yoke 44 as a pivot point. The upper part of the movable iron piece 5 is connected to the card 7. The movable iron piece 5 includes a protrusion 5a. The protrusion 5a is a part that is assembled to the hinge spring 6, and is, for example, a protrusion for solid caulking.

The hinge spring 6 is placed between the base 2 and the yoke 44 by being inserted in the insertion direction Y1, and urges the movable iron piece 5 in a direction away from the electromagnet device 4. The hinge spring 6 is assembled to the base 2 and the yoke 44 from the insertion direction Y1. The hinge spring 6 urges the movable iron piece 5 in a direction away from the iron core 43.

As shown in FIGS. 3 to 5, the hinge spring 6 has a bent shape. The hinge spring 6 has a substantially L-shape and is formed, for example, by press working. The hinge spring 6 is arranged behind the stopper parts 44c and 44d. As shown in FIGS. 3 and 4, the hinge spring 6 is separated from the stopper parts 44c and 44d in a state where it is locked by the locking part 31. That is, when the hinge spring 6 is assembled to the base 2 and the yoke 44, it is separated from the stopper parts 44c and 44d. Note that the front end of the hinge spring 6 faces the stopper portions 44c and 44d in the front-rear direction.

The hinge spring 6 includes a first portion 6a, a second portion 6b, a through hole 6c, and locking claws 6d and 6e. The first portion 6a extends in a direction intersecting the front-rear direction and is disposed at the rear of the movable iron piece 5. The second portion 6b is bent forward from the lower end of the first portion 6a.

The second portion 6b extends in a direction intersecting the up-down direction. The second portion 6b is disposed between the bottom portion 21 of the base 2 and the second plate portion 44b of the yoke 44. The second portion 6b is inserted between the bottom portion 21 of the base 2 and the second plate portion 44b of the yoke 44 from the insertion direction Y1. The front end of the second portion 6b faces the stopper portions 44c and 44d in the front-rear direction. The second portion 6b is separated from the stopper portions 44c and 44d in a state in which the locking claw 6d is locked to the locking portion 31 and the locking claw 6e is locked to the locking claw 6e. The front end of the second portion 6b can come into contact with the stopper portions 44c and 44d when the hinge spring 6 is assembled to the base 2 and the yoke 44 from the insertion direction Y1.

The through hole 6c passes through the first portion 6a in the front-back direction. The through hole 6c is a hole for caulking and fixing the protrusion 5a of the movable iron piece 5.

The locking claws 6d and 6e are formed on the second portion 6b. The locking claws 6d and 6e are cut and raised so that their respective rear ends are positioned above their respective front ends. The locking claw 6d is locked to the locking portion 31. The locking claw 6e is locked to the locking portion 32. In this embodiment, a plurality of locking claws 6d and 6e are provided, but only one locking claw may be provided, for example, at the center of the second portion 6b in the left-right direction.

The card 7 is made of an insulating material such as resin. The card 7 is arranged above the electromagnetic device 4. The card 7 is supported by the base 2 so as to be movable in the front and back direction. The rear end of the card 7 is connected to the movable iron piece 5. The card 7 moves in the front-rear direction along a pair of guide parts 23 formed on the base 2 as the movable iron piece 5 rotates. The pair of guide parts 23 extend in the front-rear direction, and the card 7 slides thereon. The front end of the card 7 is arranged to face the movable contact piece 10 in the front-rear direction, and can press the movable contact piece 10.

When the coil 41 is not energized, the card 7 is pressed against the movable iron piece 5 in a direction away from the movable contact piece 10 by the biasing force of the hinge spring 6, and the card 7 is in a state away from the movable contact piece 10. . At this time, the second fixed contact 9a is in contact with the second movable contact 10b.

When a voltage is applied to the coil 41 and the coil 41 is excited, the movable iron piece 5 is attracted to the iron core 43 and rotates. As the movable iron piece 5 rotates, the card 7 is pressed by the movable iron piece 5 and moves forward along the pair of guide parts 23. As a result, the movable contact piece 10 is pressed forward, the second movable contact 10b moves away from the second fixed contact 9a, and the first movable contact 10a contacts the first fixed contact 8a.

Next, the manufacturing process of the electromagnetic relay 1, particularly the process of assembling the electromagnetic device 4 and the hinge spring 6 to the base 2, will be explained. The manufacturing process of the electromagnetic relay 1 includes a first process, a second process, and a third process. In the first step, the base 2, the electromagnet device 4, and the hinge spring 6 to which the movable iron piece 5 is assembled are prepared. Note that a coil 41, a spool 42, an iron core 43, and a yoke 44 are assembled into the electromagnet device 4 in a separate process. Further, the hinge spring 6 is fixed by caulking the movable iron piece 5 in a separate process.

The second step is to assemble the electromagnet device 4 to the base 2. Specifically, the second plate portion 44b of the yoke 44 of the electromagnet device 4 is inserted into the insertion groove of the base 2 from the rear of the base 2, and the electromagnet device 4 is assembled to the base 2.

In the third step, the hinge spring 6 is assembled to the base 2 and the yoke 44. Specifically, the second portion 6b of the hinge spring 6, on which the movable iron piece 5 is assembled, is inserted between the bottom portion 21 of the base 2 and the second plate portion 44b of the yoke 44 from the insertion direction Y1. At this time, the second portion 6b of the hinge spring 6 is pushed in the insertion direction Y1 until the locking pawl 6d is locked with the locking portion 31 and the locking pawl 6e is locked with the locking portion 32. As a result, the hinge spring 6 is assembled to the base 2 and the yoke 44.

In the electromagnetic relay 1 described above, when the hinge spring 6 is assembled to the base 2 and the yoke 44, the movement of the hinge spring 6 in the insertion direction Y1 is restricted by the stopper portions 44c and 44d. Specifically, in the third step described above, if the hinge spring 6 is pushed too far in the insertion direction Y1, the second portion 6b of the hinge spring 6 comes into contact with the stopper parts 44c and 44d, and the hinge spring 6 is pushed in the insertion direction Y1. Movement to is restricted. Thereby, when assembling the hinge spring 6 to the base 2 and the yoke 44, it is possible to prevent the hinge spring 6 from entering too far in the insertion direction Y1. As a result, the positioning accuracy of the hinge spring 6 can be improved.

Further, the stopper portions 44c and 44d are provided on the yoke 44. For this reason, for example, compared to the case where the resin-molded base 2 is provided with a structure corresponding to the stopper parts 44c, 44d, it is easier to achieve dimensional accuracy of the stopper parts 44c, 44d, and the stopper parts 44c, 44d and the hinge spring are It is possible to suppress generation of abrasion powder when there is interference with 6.

Although the embodiment of the electromagnetic relay according to one aspect of the present invention has been described above, the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the invention.

The configurations of the contact device 3 and the electromagnet device 4 may be changed. For example, the second fixed terminal 9 and the second movable contact 10b may be omitted. The shape of the card 7 may be changed.

The shape and number of stopper portions 44c and 44d may be changed. For example, the stopper portion 44d may be omitted and the stopper portion 44c may be arranged at the center of the second plate portion 44b of the yoke 44 in the left-right direction. In this case, the stopper portion 44c may have an elongated shape. Further, at least a portion of the stopper portions 44c and 44d facing the front end of the second portion 6b may be formed in a linear shape. For example, the stopper parts 44c and 44d may be formed in a rectangular shape when viewed from below.

In the embodiment, the locking parts 31 and 32 were provided on the yoke 44, but the locking parts 31 and 32 may be provided on the bottom 21 of the base 2, as shown in FIG. In this case, the locking claws 6d and 6e of the hinge spring 6 are cut and raised so that their respective rear ends are located below their respective front ends.

1 Electromagnetic relay 2 Base 4 Electromagnet device 5 Movable iron piece 6 Hinge springs 31, 32 Locking part 41 Coil 44 Yokes 44c, 44d Stopper part

Claims (7)

base and
an electromagnetic device including a coil and a yoke disposed around the coil and supported by the base;
a movable iron piece disposed opposite to the electromagnetic device;
a hinge spring disposed between the base and the yoke when inserted from the insertion direction, and biasing the movable iron piece in a direction away from the electromagnet device;
a locking portion provided on either the base or the yoke and locking the hinge spring;
Equipped with
The yoke includes at least one stopper portion that is disposed in the insertion direction with respect to the locking portion and limits movement of the hinge spring in the insertion direction.
Electromagnetic relay.
The hinge spring is separated from the stopper portion in a state locked by the locking portion.
The electromagnetic relay according to claim 1.
the at least one stopper section includes a plurality of stopper sections,
The plurality of stopper parts include a first stopper part and a second stopper part separated from the first stopper part in a direction intersecting the insertion direction.
The electromagnetic relay according to claim 1 or 2.
the locking portion is arranged in line with the at least one stopper portion in the insertion direction;
The electromagnetic relay according to any one of claims 1 to 3.
The stopper portion has a protrusion shape.
The electromagnetic relay according to any one of claims 1 to 4.
The stopper portion has an arc shape,
The electromagnetic relay according to any one of claims 1 to 5.
The locking portion is provided on the yoke,
The electromagnetic relay according to any one of claims 1 to 6.

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