JP2010108653A - Electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic relay capable of increasing a force of pressing an armature against a yoke. <P>SOLUTION: The electromagnetic relay includes a hinged type electromagnet 1 having an iron core 11 around which an exciting coil 14 is wound, the yoke 13 formed in an L-shape and forming a magnetic path, and the armature 12 formed in a plate shape. In the electromagnetic relay, a contact is changed with the electromagnet 1. The contact is formed by a movable spring 40 mounted on the armature 12 with one end fixed to the yoke 13 and a fixed contact 21. A supporting member 23a is arranged on the opposite side of the yoke 13 sandwiching the armature 12. A supporting spring 41 which is a plate spring bent in a V-shape is arranged between the armature 12 and the supporting member 23a. The supporting spring 41 is arranged such that one end is fixed to the supporting member 23a, the bent center portion abuts on the armature 12 and the other end abuts on the supporting member 23a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electromagnetic relay.

  Conventionally, as shown in FIG. 12A, an electromagnetic relay that opens and closes contacts by an electromagnet 1 has been provided.

  The electromagnet 1 includes an iron core 11 around which an exciting coil 14 is wound, a yoke 13 formed in an L shape and forming a magnetic path, and a plate-like one end facing the iron core 11 and the other end. And the armature 12 with which the yoke 13 abuts.

  The contact is formed by a fixed contact 21 and a movable spring 40 and a movable contact 22 fixed to the movable spring 40. The movable spring 40 is attached to the armature 12 and integrated with the armature 12, and one end is fixed to the yoke 13. That is, the movable spring 40 has a function of urging the armature 12 toward the yoke 13, a function of displacing the armature 12 together with the armature 12, and a function of displacing the movable contact 22, and elasticity when the energization of the exciting coil 14 is stopped. A function of returning the armature 12 and the movable contact 22 by force.

  By the way, in the electromagnetic relay shown in FIG. 12A, the movable contact terminal 23 is fixed to the yoke 13 so as not to overlap the movable spring 40, as shown in 12B. That is, the movable contact terminal 23 is electrically connected to the movable spring 40 through the yoke 13. However, since the yoke 13 has higher electrical resistance than the movable spring 40, the electromagnetic relay shown in FIG.

  On the other hand, Patent Document 1 discloses an electromagnetic relay that directly connects a movable spring and a movable contact terminal. In the electromagnetic relay described in Patent Document 1, as shown in FIG. 13, the movable spring 40 has a movable contact 22 fixed to one end and the other end fixed at a fixed position and connected to the movable contact terminal 23. Has been.

  The fixed contacts 21 and 21 ′ are arranged on both sides of the movable contact 22. When the exciting coil 14 is not energized, the movable contact 22 contacts one fixed contact 21 ′ and the other fixed contact 21. Separate from.

  The electromagnet 1 is formed in an iron core 11 around which an exciting coil 14 is wound, a yoke 13 formed in an L-shape, and a U-shape bent at a central portion, and one end portion is opposed to the iron core 11. And the armature 12 disposed at the other end so as to be close to the movable spring 40.

  A recovery spring 27, which is a leaf spring, is disposed on the opposite side of the yoke 13 with the armature 12 interposed therebetween. One end of the recovery spring 27 is fixed at a fixed position, and the other end abuts on one end of the armature 12 (the end opposite to the end facing the iron core 11), and the armature 12 is connected to the yoke. 13 is energized.

  When one end of the armature 12 is attracted to the iron core 11, the armature 12 deforms the recovery spring 27 and the movable spring. When the suction by the iron core 11 is stopped, the movable spring 40 returns the movable contact 22 and the recovery spring 27 returns the armature 12.

That is, the role of returning the movable contact 22 is played by the movable spring 40, and the role of urging the armature 12 toward the yoke 13 and the role of returning the armature 12 are played by the recovery spring 27.
Japanese Patent No. 2539099

  In the electromagnetic relay shown in FIG. 13, as described above, the recovery spring 27 plays a role of biasing the armature 12 toward the yoke 13, but the recovery spring 27 is a cantilever spring in which only one end is fixed. Therefore, there is a problem that the force for urging the armature 12 toward the yoke 13 is weak and the force for pressing the armature 12 against the yoke 13 is weak.

  This invention is made | formed in view of the said reason, The objective is to provide the electromagnetic relay which can reduce the emitted-heat amount and can strengthen the force which presses an armature to a yoke.

  According to the first aspect of the present invention, there is provided an iron core around which an exciting coil is wound, a connecting piece connected to one end of the iron core, and a magnetic path piece separated from the iron core within a range in which a magnetic path can be formed along the iron core. And one end is attracted to the iron core when the excitation coil is energized with one end abutting against the tip of the magnetic path piece of the yoke and the other end facing the iron core. And a conductive leaf spring that forms a contact point with a fixed contact, and is attached to the armature, and one end portion is fixed to the movable contact terminal, and the attraction force and elastic force of the iron core acting on the armature A movable spring that is displaced between a position away from the fixed contact and a position in contact with the fixed contact, a support member disposed on the opposite side of the yoke magnetic path piece across the armature, and the armature and support A leaf spring disposed between the member and one end fixed to the support member and the other end to the support member Central contact is characterized by comprising a support spring which biases the bent and armature in contact with the form on the yoke side armature.

  According to a second aspect of the present invention, in the first aspect of the present invention, the one end portion of the support spring has a tip portion folded back to the armature side and abuts on the support member at the folded portion. To do.

  According to the first aspect of the present invention, the movable spring that forms the contact with the fixed contact is fixed to the movable contact terminal, so that the movable spring and the movable contact terminal are electrically connected via the yoke. The amount of heat generated can be reduced as compared with the configuration, and the support spring that biases the armature toward the yoke is a leaf spring supported at both ends by the support member. Compared to the conventional configuration in which the spring that biases the pole toward the yoke is a cantilever spring, there is an advantage that the force for pressing the armature against the yoke can be increased.

  According to the configuration of the invention of claim 2, the end of the support spring is folded at the tip toward the armature, and abuts against the support member at the folded portion, so that the armature is displaced by the support spring. In doing so, there is an advantage that the surface of the support member can be slid without being caught by the support member.

(Embodiment 1)
In the present embodiment, as shown in FIG. 1, an electromagnetic relay that opens and closes contacts by an electromagnet 1 is illustrated. The electromagnet 1 includes an iron core 11, a yoke 13, and an armature 12 and is accommodated in the housing 3.

  As shown in FIGS. 1 and 4, the iron core 11 is formed in a cylindrical shape, and the exciting coil 14 is wound along the circumferential direction. As shown in FIG. 3, the exciting coil 14 is connected to a coil terminal 26 and energized.

  As shown in FIG. 1, the yoke 13 has a connecting piece 13 a connected to one end (upper end in the figure) of the iron core 11 in the central axis direction (up and down direction in the figure) and the center axis direction of the iron core 11. A magnetic path piece 13b that is spaced apart from the iron core 11 along the L-shape, and the tip (lower end in the figure) of the magnetic path piece 13b is separated from the other end (lower end in the figure) of the iron core 11. .

  As shown in FIGS. 1 and 2, the armature 12 is formed in a plate shape, and an abutting portion 12 a that is one end portion is formed at the tip of the magnetic path piece 13 b of the yoke 13 in the direction of the central axis of the iron core 11. The suction part 12b which is in contact with the other end faces the iron core 11 in the central axis direction of the iron core 11. That is, the electromagnet 1 is formed in a hinge shape.

  As shown in FIG. 1, the contact is formed by a fixed contact 21, a movable spring 40 that is a conductive leaf spring, and a movable contact 22 fixed to the movable spring 40. The movable spring 40 is formed with a dimension longer than the length dimension of the armature 12 in the direction connecting the suction part 12b and the contact part 12a in the armature 12 (left and right direction in the figure), and the direction of the central axis of the iron core 11 Is attached to the armature 12 so that the armature 12 is positioned in the center.

  The movable contact 22 is fixed to the iron core 11 side (upper side in the figure) at the end (left end part in the figure) of the movable spring 40 on the side close to the suction part 12b of the armature 12. The other end (the right end in the figure) of the movable spring 40 is fixed to the movable contact terminal 23.

  If it demonstrates concretely, the movable contact terminal 23 will be formed in the plate shape, and is arrange | positioned in the form which penetrates the wall of the housing | casing 3 located in the other side of the iron core 11 on both sides of the armature 12. FIG. An end portion (upper end portion in the drawing) of the movable contact terminal 23 in the housing 3 extends along the wall surface of the housing 3 and is attached to the housing 3. The end of the movable spring 40 is fixed to the extended end of the movable contact terminal 23 (upper end in the figure).

  Since the movable spring 40 is directly connected to the movable contact terminal 23, the movable spring 40 and the movable contact terminal 23 are fixed to the yoke 13 and the movable spring 40 and the movable contact terminal 23 are connected via the yoke 13. The amount of heat generation can be reduced as compared with the conventional configuration in which electrical connection is made.

  Further, in the conventional configuration in which the movable spring 40 is fixed to the yoke 13, it is necessary to fix both end portions in the width direction of the movable spring 40 in order to securely fix the end portion of the movable spring 40 (FIG. 12). (Refer to (b)), if the width dimension of the yoke 13 is increased in accordance with the width dimension of the movable spring 40, the width dimension of the yoke 13 may be larger than the width dimension of the armature 12, but in this embodiment, Since the movable spring 40 is directly fixed to the movable contact terminal 23, the width dimension of the yoke 13 can be reduced to the width dimension of the armature 12.

  On the other hand, the fixed contact 21 is disposed to face the movable contact 22 in the thickness direction of the movable spring 40. Specifically, the fixed contact 21 is disposed on the iron core 11 side (upper side in the drawing) viewed from the movable contact 22. The fixed contact 21 is connected to the fixed contact terminal 24.

  A pedestal 25 that contacts the movable contact 22 is attached to the wall of the housing 3 on the opposite side of the fixed contact 21 across the movable contact 22. The distance (contact gap) between the movable contact 22 and the fixed contact 21 is determined by the projecting dimension of the base 25 from the wall of the housing 3 (the vertical dimension in the figure).

  On the opposite side of the tip of the magnetic path piece 13b of the yoke 13 across the contact portion 12a of the armature 12, a support member 23a formed in a plate shape is disposed. In this embodiment, as shown in FIG. 6, the support member 23a (shaded portion in the figure) is formed extending from the movable contact terminal 23, and the number of parts is reduced.

  As shown in FIG. 1, a support spring 41, which is a leaf spring bent in a V shape, is disposed in the gap between the contact portion 12a of the armature 12 and the support member 23a. The support spring 41 is arranged such that the direction connecting both ends coincides with the direction connecting the contact portion 12a and the suction portion 12b of the armature 12 (the left-right direction in the drawing). One end of the support spring 41 is fixed to the support member 23a, the bent central portion is in contact with the armature 12, and the other end is in contact with the support member 23a.

  In the present embodiment, as shown in FIG. 5, the support spring 41 is formed to extend from an end portion (right end portion in the figure) fixed to the movable contact terminal 23 in the movable spring 40, and the number of parts is reduced. ing. The support spring 41 is deformed so that both end portions sandwiching the central portion that contacts the armature 12 are separated from each other when the exciting coil 14 is not energized.

  Further, the support spring 41 extends from both sides of the end of the movable spring 40. That is, in the present embodiment, a pair of support springs 41 is formed on the movable spring 40. However, the present invention is not limited to this, and as shown in FIG. 7, only one support spring 41 ′ may be formed. That is, only one support spring 41 ′ extends from the wall surface of the through-hole 44 that extends through the central portion of the movable spring 40 ′ and is formed at the central portion of the movable spring 40 ′.

  Further, the support spring 41 is not limited to a V shape, and may be a semicircular shape as shown in FIGS. The support spring 41 ″ formed in a semicircular shape has one end fixed to the support member 23a, the center contacting the contact 12a of the armature 12, and the other end contacting the support 23a. Arranged.

  Next, the operation of this embodiment will be described with reference to FIG. When the exciting coil 14 is energized, the attracting portion 12 b of the armature 12 is attracted to the iron core 11. When the armature 12 is attracted to the iron core 11, the movable spring 40 is displaced together with the armature 12, the movable contact 22 contacts the fixed contact 21, and the contact is closed.

  Further, the movable spring 40 is deformed with an end portion (right end portion in the figure) fixed to the movable contact terminal 23 as a fulcrum to generate an elastic force. When the energization of the exciting coil 14 is stopped, the movable contact 22 is separated from the fixed contact 21 by the elastic force of the movable spring 40, and the contact is opened. The movable contact 22 away from the fixed contact 21 comes into contact with the pedestal 25 and is received by the pedestal 25. That is, the movable spring 40 is displaced between a position where the movable contact 22 contacts the pedestal 25 (a position away from the fixed contact) and a position where the movable contact 22 contacts the fixed contact 21.

  In the present embodiment, as described above, the contact is a contact that closes when the exciting coil 14 is energized. However, the contact is not limited to the a contact, and the contact can be configured by a b contact or a c contact. .

  Next, the operation of the support spring 41 will be described with reference to FIG. When the armature 12 is attracted to the iron core 11 and displaced (displaced from the position indicated by the solid line in the drawing to the position indicated by the broken line), the center portion of the support spring 41 slides on the surface of the armature 12, One end slides on the surface of the support member 23a, and both end portions sandwiching the center portion approach each other, and the support spring 41 is in contact with the center portion and the armature 12, and between the both end portions and the support member 23a. The shape is changed (the shape shown by the solid line in the figure is changed to the shape shown by the broken line). That is, the support spring 41 maintains the biasing of the yoke 13 toward the tip end portion of the magnetic path piece 13b at the contact portion 12a of the armature 12 without hindering the displacement of the armature 12.

  When energization to the exciting coil 14 is stopped and the armature 12 is displaced (displaced from the position indicated by the broken line to the position indicated by the solid line), the support spring 41 is crushed by the armature 12 and the support member 23a. Deformation (deformation from the shape shown by the broken line in the figure to the shape shown by the solid line).

  9A and 9B, one end portion of the support spring 41 (the end portion not fixed to the support member 41) is folded back to the armature 12 side, and the support member at the folded portion. It is desirable to contact 23a. That is, the end of the support spring 41 can slide on the surface of the support member 23a without being caught on the surface of the support member 23a.

  As described above, the support spring 41 that biases the contact portion 12a of the armature 12 toward the tip end side of the magnetic path piece 13b of the yoke 13 has one end fixed to the support member 23a and the other end supported to the support member. If the material and thickness dimensions are the same as in the conventional configuration in which the spring is a cantilever spring and is a cantilever spring that urges the armature toward the yoke side, the armature 12 is connected to the yoke. The force pressed against 13 can be increased.

  If the force for pressing the armature 12 against the yoke 13 is increased, the magnetic resistance at the contact portion between the contact portion 12a of the armature 12 and the magnetic path piece 13b of the yoke 13 is reduced, and the efficiency is increased. The effect that the deformation | transformation of can be suppressed can be expected. That is, even when the electromagnetic relay is used such that the direction in which the armature 12 is attracted is vertically upward, the downward load of the armature 12 is supported by the support spring 41 and the pedestal 25, and the armature 12 The deformation of the movable spring 40 such that the contact portion 12a is separated from the yoke 12 is suppressed.

  Further, when a resin molded product is used as the support member 23a, there is a possibility that one end of the support spring 41 slides on the surface of the support member 23a and the support member 23a is scraped to generate molding powder. Since 23a is formed to extend from the movable contact terminal 23, the support member 23a is not scraped by the support spring 41, and there is no possibility that molding powder is generated.

  If one end of the support spring 41 is not supported by the support member 23a and is a cantilever spring (without the support member 23a), the contact portion 12a of the armature 12 is attached to the magnetic path piece 13b side of the yoke 13. The force that presses the contact portion 12a against the magnetic path end portion 13a is weakened.

  In addition, as shown in FIG. 11, the contact portion 12 a of the armature 12 is also provided when a single spring 43 is used instead of the support spring 41, which is bent in an arc shape and whose one end does not contact the support member 23 a. Although it can be urged toward the tip end side of the magnetic path piece 13b of the yoke 13, the force for pressing the contact portion 12a against the magnetic path piece 13a is weakened.

It is sectional drawing which shows embodiment. It is sectional drawing of another direction same as the above. It is sectional drawing of another place same as the above. It is a top view in case there is no housing | casing in the same as the above. It is a top view of a part of movable spring, fixed contact terminal, and housing | casing in the same as the above. It is a top view of a movable contact terminal same as the above. It is a top view which shows the movable spring of another form same as the above. It is sectional drawing which shows another form same as the above, (a) is a general view, (b) is an enlarged view of a support spring. It is sectional drawing which shows another form same as the above, (a) is a general view, (b) is an enlarged view of a support spring. It is explanatory drawing explaining operation | movement of a support spring same as the above. It is a reference drawing of the spring which urges an armature to a yoke side. It is a figure which shows a prior art example. It is a top view which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Iron core 12 Armature 13 Relay 21 Fixed contact 23 Movable contact terminal 23a Support member 40 Movable spring 41 Support spring

Claims (2)

  A yoke having an iron core around which an exciting coil is wound, a connecting piece connected to one end of the iron core, and a magnetic path piece along the iron core and separated from the iron core within a range in which a magnetic path can be formed; An armature that is formed in a plate shape and has one end abutting against the tip of the yoke magnetic path piece, the other end facing the iron core, and energizing the exciting coil. A conductive leaf spring that forms a contact with the contact, and is attached to the armature and at one end is fixed to the movable contact terminal and separated from the fixed contact by the attractive force and elastic force of the iron core acting on the armature A movable spring that is displaced between a position that contacts the fixed contact, a support member that is disposed on the opposite side of the magnetic path piece of the yoke across the armature, and that is disposed between the armature and the support member. One end is fixed to the support member, the other end is in contact with the support member, and the center is an armature. Electromagnetic relay, characterized in that it comprises a support spring for urging the bent and armature in contact with the form on the yoke side. 2. The electromagnetic relay according to claim 1, wherein one end portion of the support spring has a tip portion folded back to the armature side and abuts on the support member at the folded portion.

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