JP2005174709A - Polar electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seesaw type polar electromagnetic relay in which a permanent magnet is positioned with a high accuracy and a good reliability at low cost. <P>SOLUTION: An armature block 10 is formed by putting a permanent magnet 2 between a positioning member 1 engagement-fixed to a yoke of a electromagnetic coil and an armature 3 to form a lamination layer, and these are formed in a body with a hinge spring 4 and incorporated in an electromagnetic relay. The positioning member 1 includes dowels 12 for positioning two sides of the permanent magnet 2, an arm 11 for positioning other two sides, and a pawl portion 14 formed opposite to the arm 11, and thus the permanent magnet 2 is positioned without clattering in three directions perpendicular to each other. A space between tips of the arms 11 is formed narrow in advance and the permanent magnet 1 is inserted under pressure between both of the arms 11. The positioning member 1 is manufactured by press-processing at low cost, thereby deleting the possibility of misregistration of the permanent magnet 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a seesaw-type polarized electromagnetic relay having a permanent magnet.

  Conventionally, as a polarized electromagnetic relay having a permanent magnet built into a magnetic circuit, a polarized electromagnetic relay using a translational armature block formed by interposing a permanent magnet between two flat armatures Is known (see, for example, Patent Document 1). There is also known a seesaw-type polarized electromagnetic relay in which a permanent magnet is disposed and fixed between the magnetic poles of an electromagnetic coil so that the armature is attracted and separated from the permanent magnet and the coil magnetic pole (for example, Patent Documents). 2).

  The electromagnetic relay shown in the above-mentioned Patent Document 2 causes the armature to perform a seesaw operation so as to avoid the inertia force when the permanent magnet moves together with the armature in the electromagnetic relay as shown in Patent Document 1. . By the way, in the seesaw-type polarized electromagnetic relay shown in Patent Document 2, a permanent magnet is attracted by a magnetic force to a flat auxiliary yoke and is held and held by a hinge spring. Even if the magnet holding force is strengthened, the permanent magnet may be displaced due to an unexpected impact force. Therefore, in order to solve this problem, the auxiliary yoke is provided with a plurality of dowels (protrusions) for preventing lateral displacement, and further, the arm is formed by extending and bending the peripheral edge of the auxiliary yoke to sandwich the permanent magnet, It is conceivable to use the auxiliary yoke as a permanent magnet positioning member.

  The incorporation and fixing of the permanent magnet in the seesaw type polarized electromagnetic relay in such a case will be described with reference to FIG. A permanent magnet in a seesaw-type polarized electromagnetic relay is used to maintain the state of a seesaw-type armature that rotates (seesaw operation) by being attracted and separated by the magnetic pole of the yoke (iron core) according to the excitation state of the coil. It is done. As shown in FIG. 6B, the permanent magnet 2 and the armature 3 are integrated as an armature block 10A and incorporated into an electromagnetic relay (position of the armature block 10 in FIG. 1). As shown in FIG. 6A, the armature block 10A is formed by laminating a permanent magnet 2 in a sandwich shape with a positioning member 1A fitted and fixed to a yoke and an armature 3, and a hinge spring 4 These are formed integrally. The direction of magnetization of the permanent magnet 2 is the stacking direction of the armature blocks 10A. The permanent magnet 2 has a rectangular shape, for example, and is positioned around the circumference by a dowel (projection) 12 provided on the positioning member 1A, and is fixed by an adhesive as necessary.

In addition, the hinge spring 4 is engaged by inserting the protrusion 13 formed on the arm 11 of the positioning member 1A into the hole 43 formed in the bent portion of the pair of arms. The armature 3 and the hinge spring 4 are positioned relative to each other by the projection 33 of the armature 3 and the hole 42 of the hinge spring 4. As shown by an arrow Y, the armature 3 has a protrusion 32 at the approximate center of the surface facing the permanent magnet 2, and is biased by the hinge spring 4 so as to rotate around the protrusion 32. The permanent magnet 2 is pressed. The protruding portion 31 of the armature 3 is used to transmit the rotation operation of the armature 3 to a movable contact (not shown) of the electromagnetic relay.
Japanese Utility Model Publication No. 1-159345 JP 2002-15651 A

  However, in the seesaw-type polarized electromagnetic relay, the positioning and holding of the permanent magnets shown in FIG. 6 still have the following problems. This will be described with reference to FIGS. 7A to 7D show the positional relationship between the positioning member 1A and the permanent magnet 2, and FIG. 8 shows the relationship between the shape deformation and positioning accuracy in the positioning member 1A. As shown in FIG. 7C, the permanent magnet 2 is positioned by the eight dowels 12 of the positioning member 1 </ b> A, and the arm 11 is not involved in the positioning of the permanent magnet 2. That is, at a position higher than the height of the dowel 12, there is a backlash that allows the permanent magnet 2 to move between the two arms 11. If any unexpected and excessive impact is applied to the electromagnetic relay in which the armature block 10A is incorporated, the adhesive is peeled off, the permanent magnet is lifted, gets over the positioning dowel 12 and returns to the original position. It cannot be said that there is no possibility of malfunctioning without being able to return.

  The above-described positioning member 1A is formed by press working using a mold, and the fundamental dimension L1 of the arm 11 shown in FIG. 8 can be faithfully reproduced from the mold part dimensions, and stable dimension securing is easy. On the other hand, if the dimension L2 of the tip of the arm 11 changes, the position of the projection 13 that engages with the hinge spring 4 described above changes, and an error Δh in the height position occurs, which adversely affects the stable operation of the electromagnetic relay as described above. There is. However, it is not always easy to secure the dimension L2 at the tip of the arm 11 stably and with high accuracy due to variations in deformation due to springback of the material after processing or stagnation during bending.

  The pivot center of the armature 3 is the center of the protrusion 13 formed on the arm 11 (see FIG. 3). Therefore, when the height position of the arm 11 varies in each armature block, the variation in the amount of pressing of the armature 3 by the hinge spring 4 increases. Then, when the armature 3 rotates, the frictional force between the projection 32 of the armature 3 and the surface of the permanent magnet 2 and the frictional force between the protrusion 13 and the hole of the hinge spring 4 engaged therewith fluctuate. This may affect the stable operation of the electromagnetic relay.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a seesaw-type polarized electromagnetic relay in which positioning of a permanent magnet is realized with low cost, high accuracy and reliability.

  In order to achieve the above-mentioned object, the invention of claim 1 is characterized in that a coil is wound around a central portion, both ends are bent in the same direction, and both ends are magnetic pole portions, and fixed to the yoke. The positioning member, the permanent magnet disposed between the two magnetic pole portions of the yoke by the positioning member, and a plate shape longer than the length between the two magnetic pole portions of the yoke, and the excitation state of the coil Accordingly, the seesaw-type armature that is attracted and separated by the magnetic pole portion of the yoke and rotates about the center, and both the magnetic pole sides of the armature are swingable with respect to the magnetic pole portions of the yoke. And a hinge spring that integrally fixes the permanent magnet and the armature, wherein the permanent magnet is positioned by a dowel formed on the positioning member and is paired with the positioning member. Is held by the arm provided. It is polarized electromagnetic relay, characterized in that is retained in the claw portion.

  According to a second aspect of the present invention, in the polarized electromagnetic relay according to the first aspect, the interval between the arm tips is narrowed in advance to be smaller than the width of the electromagnet sandwiched by the arm, and the permanent magnet is the arm. It is positioned by press-fitting between them.

  According to the first aspect of the present invention, since the permanent magnet is positioned by the dowel and clamped by the arm, and the retaining by the claw of the arm is performed, the press processing same as the conventional processing method causes an increase in cost. In addition, the positioning of the permanent magnet can be realized inexpensively with high precision and reliability. According to the second aspect of the present invention, since the permanent magnet is press-fitted between the arms that are narrowed in advance at an interval narrower than the width of the sandwiched electromagnet, the permanent magnet can be positioned with high accuracy without play. The positioning accuracy of the permanent magnet is good, and the permanent magnet is prevented from being detached or displaced, so that a highly reliable seesaw-type polarized electromagnetic relay is realized.

  Hereinafter, a seesaw-type polarized electromagnetic relay according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the seesaw-type polarized electromagnetic relay 6 with the case cover removed. The seesaw-type polarized electromagnetic relay 6 includes a yoke 51 having a coil 53 wound around a central portion via a bobbin 52, bent at both ends in the same direction, and poles 51a and 51b at both ends, and a yoke 51 The positioning member 1 fixed to the positioning member 1, the permanent magnet 2 disposed between the magnetic pole portions 51a and 51b of the yoke 51 by the positioning member 1, and the length between the magnetic pole portions 51a and 51b of the yoke 51 are longer. And a seesaw-type armature 3 which is attracted and separated by the magnetic poles 51a and 51b of the yoke 51 according to the excitation state of the coil 13 and rotates about the center, and both magnetic poles of the yoke 51 A hinge spring 4 is provided to fix the permanent magnet 2 and the armature 3 together so that both the magnetic pole sides of the armature 3 can swing with respect to 51a and 51b. The positioning member 1, the permanent magnet 2, and the armature 3 are integrated by a hinge spring 4 to constitute an armature block 10.

  The seesaw-type polarized electromagnetic relay 6 includes a fixed terminal 72 in which a fixed contact plate 74 provided with a fixed contact 76 is electrically fastened by a rivet, and a movable spring 73 provided with a movable contact 75 facing the fixed contact 76. The movable contact 71 is electrically connected with a rivet, and the armature 3 is connected to the armature 3 through the projecting portion 31 so that the movable contact 75 contacts and separates from the fixed contact 76 in accordance with the rotation of the armature 3. And a card 55 for displacing the movable spring 73 via the end 77.

  The operation of the electromagnetic relay 6 will be described. The electromagnetic relay 6 is a so-called latching type in which the central axis of the protrusion 13 is the center of rotation of the armature 3 (see FIG. 3), and the permanent magnet 2 is disposed symmetrically with respect to the center of rotation of the armature 3. Bistable or bi-stable type) electromagnetic relay. A current flows from the coil terminal 54 to the coil 53, and an electromagnetic coil composed of the yoke 51 and the coil 53 is excited. In the electromagnetic relay 6, when the electromagnetic coil is not excited, the armature 3 is always attracted to one of the magnetic poles 51a, for example, and even if the coil excitation is stopped, the armature 3 is attracted and held as it is. The magnetic pole 51b is reversely attracted to the other magnetic pole 51b by the excitation currents having different polarities, and even if the coil excitation is stopped, the magnetic pole 51b attracted at that time is attracted and held as it is. The rotation operation of the armature 3 is transmitted as indicated by an arrow x or the like, causing a contact / separation operation between the movable contact 75 and the fixed contact 76, and the electromagnetic relay 6 operates.

  The assembly and rotation structure of the armature block will be described with reference to FIGS. As shown in FIGS. 2A and 2B, the armature block 10 is formed by laminating a permanent magnet 2 sandwiched between a positioning member 1 and an armature 3 and integrating them with a hinge spring 4. The The permanent magnet 2 is press-fitted between the two arms 11 of the positioning member 1, and is prevented from coming off by the claw portion 14 in a press-fitted state. The direction of magnetization of the permanent magnet 2 is the stacking direction of the armature blocks 10. The description of the other structure of each part is the same as the description in FIG. The above seesaw-type polarized electromagnetic relay 6 is formed by incorporating a preassembled armature block 10 into a case 61. The center of rotation of the armature 3 is the center of the protrusion 13 formed on the arm 11 as shown in FIGS. FIG. 3A shows a state in which an adhesive is applied around the dowel 12 that fixes the permanent magnet 2.

  FIG. 4 shows the positioning member 1 and the permanent magnet 2 positioned on the positioning member 1. As shown in FIG. 4A, the positioning member 1 includes a dowel 12 for positioning the left and right sides of the rectangular permanent magnet 2 and two upper and lower portions of the permanent magnet 2 as shown in FIG. The arm 11 is formed to be bent so as to be positioned in close contact with the side, and further, as shown in FIG. 4C, a claw portion 14 formed on the opposing surface of both arms 11 is provided. That is, the permanent magnet 2 is positioned and fixed in the three orthogonal directions without play by the dowels 12, the arms 11, and the claw portions 14 of the positioning member 1. Such a positioning member 1 can be manufactured at low cost, and the positioning member 1 eliminates the possibility of the permanent magnet 2 being lifted or causing malfunction.

  FIG. 5 shows the positioning member 1 that eliminates variation in deformation due to springback and bending at the time of bending after the material is manufactured by press working. That is, the positioning member 1 is formed by previously narrowing the distance between the tips of the arms 11 to be narrower than the width of the electromagnet 2 held by the arms 11. The permanent magnet 2 is press-fitted into the arrangement position 2a between the arms 11 and positioned and fixed. As shown in FIG. 3A, the positioning member 1 and the permanent magnet 2 can be further reinforced by using an adhesive. In addition, by pressing the inner surface of the tip of the arm 11 into a tapered shape, the press-fitting work of the permanent magnet 2 can be facilitated. According to such a positioning member 1, there is no occurrence of fluctuation in the dimension L2 of the tip of the arm 11 shown in FIG. 8, and stable armature rotation can be realized. The present invention is not limited to the above-described configuration, and various modifications can be made. For example, when the permanent magnet 2 is disposed asymmetrically with respect to the rotation center of the armature 3, a so-called single-stable (monostable type) electromagnetic relay can be configured. Further, the positioning member 1 can be used as an auxiliary yoke for effectively using the magnetic flux of the permanent magnet by forming it with a magnetic material.

1 is an internal plan view of a seesaw-type polarized electromagnetic relay according to an embodiment of the present invention. (A) is a disassembled perspective view explaining the assembly of the armature block which concerns on one Embodiment of this invention, (b) is a perspective view of the armature block of this invention. (A) is a side view of the same armature block, (b) is a partially enlarged view of the central portion in (a). (A) is a top view of the permanent magnet positioned by the positioning member which concerns on one Embodiment of this invention, (b) is the same side view, (c) is the detailed enlarged view of the A section in (b). (A) is a top view of the positioning member which concerns on other one Embodiment of this invention, (b) is a side view explaining permanent magnet positioning by the positioning member, (c) is a permanent magnet positioned by the same member (D) is the same side view. (A) is a disassembled perspective view explaining the assembly of the armature block of the electromagnetic relay used as the premise of this invention, (b) is a perspective view of the same armature block. (A) is a top view of the positioning member of the electromagnetic relay same as above, (b) is a side view of the positioning member, (c) is a plan view of a permanent magnet positioned by the member, and (d) is a side view of the same. The side view of the positioning member explaining the subject in the positioning member of an electromagnetic relay same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Positioning member 2 Permanent magnet 3 Armature 4 Hinge spring 6 Electromagnetic relay 11 Arm 12 Dowel 14 Claw part 51 Relay 51a, 51b Magnetic pole part 53 Coil

Claims (2)

A yoke in which a coil is wound around the center, both ends are bent in the same direction, and the both ends are magnetic poles,
A positioning member fixed to the yoke;
A permanent magnet disposed between the magnetic pole portions of the yoke by the positioning member;
A seesaw-type armature that is formed in a plate shape longer than the length between both magnetic pole portions of the yoke, is rotated away from the center by being attracted to and separated from the magnetic pole portion of the yoke according to the excitation state of the coil,
In a polarized electromagnetic relay comprising a hinge spring for integrally fixing the permanent magnet and the armature, with both pole sides of the armature swingable with respect to the magnetic pole portions of the yoke,
The permanent magnet is positioned by a dowel formed on the positioning member, is clamped by an arm provided in a pair with the positioning member, and is prevented from being removed by a claw portion provided on the arm. A polarized electromagnetic relay.   The space between the arm tips is narrowed in advance to be narrower than the width of the electromagnet held by the arm, and the permanent magnet is press-fitted between the arms and positioned. Polarized electromagnetic relay.

Images