JP2013030305A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic relay capable of increasing the shock resistance.SOLUTION: The electromagnetic relay includes: an electromagnet 1; an armature 2 that is driven to rotate by a magnetic force of the electromagnet 1; a housing 3 that stores the electromagnet 1 and the armature 2; and a support member 4 that rotatably supports the armature 2. The support member 4 includes a fixing part 41 fixed to the housing 3 and a cylindrical shaft 42 which is inserted into a bearing hole 20 in the armature 2. The fixing part 41 of the support member 4 is formed with a through hole 40 at both ends of the shaft 42, each of which goes through in a shaft direction of the shaft 42. The support member 4 easily generates a plastic deformation so that the shaft 42 rotates with respect to the fixing part 41. Even when a shock is given, a stress is absorbed by the plastic deformation hardly causing damage. Thus, the shock resistance is increased.

Description

  The present invention relates to an electromagnetic relay.

  2. Description of the Related Art Conventionally, there has been provided an electromagnetic relay in which an armature connected to a movable contact is rotationally driven by a magnetic force of an electromagnet to separate the movable contact from a fixed contact (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 4-24242

  In the electromagnetic relay as described above, the rotating shaft of the armature is relatively easily damaged when subjected to an impact.

  This invention is made | formed in view of the said reason, The objective is to provide the electromagnetic relay which can improve impact resistance.

  The present invention includes an electromagnet, an armature that is driven by the magnetic force of the electromagnet and is rotatable with respect to the electromagnet, a movable contact that is linked to the armature, and a fixed contact that the movable contact is separated from and in contact with the rotation of the armature. The electromagnet, the armature, the movable contact, and the fixed contact are housed in the housing, the electromagnet and the fixed contact are fixed to the housing, the fixed portion fixed to the housing, and the armature, respectively. And a support body that rotatably supports the armature having a cylindrical shaft portion that is inserted into the bearing hole. In the support body, a displacement direction of the movable contact and an axial direction of the shaft section are provided. At least one of the positions sandwiching the shaft portion in the orthogonal direction is a through hole penetrating in the axial direction of the shaft portion. And it is provided.

  In the above electromagnetic relay, it is preferable that the inner peripheral surface of the through hole is a curved surface.

  According to the present invention, in the support, the presence of the through hole makes it easy for elastic deformation to occur with respect to the fixed portion around the axis parallel to the displacement direction of the movable contact. Even when it is received, the stress is absorbed by the elastic deformation described above, so that the breakage hardly occurs. Further, the elastic deformation does not cause the displacement of the shaft portion in the same direction as the displacement direction of the movable contact, and therefore it is relatively difficult to affect the operation of the armature.

It is a partially omitted exploded perspective view showing an embodiment of the present invention. It is a perspective view which abbreviate | omitted partially showing the same. It is a front view which shows a support body same as the above. (A)-(c) is a front view which shows the support body in the modified example same as the above. It is a disassembled perspective view which abbreviate | omitted one part which shows the comparative example same as the above.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  In the present embodiment, as shown in FIGS. 1 and 2, an electromagnet 1, an armature 2 that is rotationally driven by the magnetic force of the electromagnet 1, and a housing 3 in which the electromagnet 1 and the armature 2 are housed and the electromagnet 1 is fixed. With. Hereinafter, the vertical and horizontal directions are defined as shown in FIG. However, the above directions are defined for convenience of explanation and do not necessarily match the directions in the actual use state.

  The housing 3 includes a body 31 having a housing recess 30 opened on the front surface and a cover (not shown) that is coupled to the front side of the body 31 and closes the housing recess 30.

  Moreover, this embodiment is provided with the support body 4 which supports the armature 2 rotatably with respect to the housing 3. The support 4 has a flat shape with the thickness direction directed in the front-rear direction, and the left and right ends are fixed to the body 31, respectively, and the support 4 protrudes forward from the center of the front surface of the fixed portion 41. And a cylindrical shaft portion 42 having the axial direction in the front-rear direction. As means for fixing the fixing portion 41 to the body 31, for example, well-known means such as fitting can be used. Further, the armature 2 is provided with a bearing hole 20 that is circular in cross section and has an inner diameter slightly larger than the outer diameter of the shaft portion 42 in the front and rear, and the shaft portion 42 is inserted into the bearing hole 20. The armature 2 is supported so as to be rotatable around the central axis of the shaft portion 42 with respect to the housing 3.

  The electromagnet 1 has a coil (not shown) fixed to the body 31 on the rear side of the fixing portion 41 with the axial direction directed in the vertical direction, and a magnetic pole piece 11 made of a magnetic material and magnetized by the coil. . The pole piece 11 has a main body portion (not shown) penetrating the coil up and down, and variable magnetic pole portions 11a projecting forward from both upper and lower end portions of the main body portion, and has a U-shape as a whole. ing. That is, each variable magnetic pole part 11a is excited to a polarity corresponding to the direction of energization of the coil, and the polarity differs between the variable magnetic pole parts 11a. The housing 3 holds a plurality of (three in the figure) coil terminals 60 each having one end electrically connected to the coil and the other end protruding to the left of the housing 3. Can be performed through the coil terminal 60. Specifically, the electromagnetic relay of this embodiment is a so-called two-winding latching type, and the coil has taps, and one coil terminal 60 is electrically connected to both ends and taps of the coil. It is connected to the.

  The armature 2 has one set of fixed magnetic pole portions 21a sandwiching one variable magnetic pole portion 11a from the left and right, respectively, at both upper and lower ends. In each set of fixed magnetic pole portions 21a, the fixed magnetic pole portion 21a on the left side of the variable magnetic pole portion 11a and the fixed magnetic pole portion 21a on the right side of the variable magnetic pole portion 11a are magnetized with different polarities. Specifically, the armature 2 is magnetically attached to two permanent magnets 22 having N poles oriented in a common direction among the left and right directions, and one of each permanent magnet 22 made of a magnetic material. Two armatures 21 are insert-molded in a synthetic resin molding 23. That is, of the armatures 21, the upper and lower ends projecting upward and downward from the permanent magnets 22 are respectively fixed magnetic pole portions 21 a. When the coil of the electromagnet 1 is energized, one of the left and right fixed magnetic pole portions 21a of the variable magnetic pole portion 11a is attracted to the variable magnetic pole portion 11a by one of the fixed magnetic pole portions 21a corresponding to the energization direction. The armature 2 rotates with respect to the housing 3 in a direction corresponding to the energizing direction of the coil. Further, once the coil is energized, the position of the armature 2 (and the position of the movable contact 51 and the like interlocked therewith) is maintained by the magnetic force of the permanent magnet 22 until a current in the reverse direction flows through the coil. (Latching).

  Further, the housing 3 accommodates a movable contact 51 that is interlocked with the rotation of the armature 2 as described above, and a fixed contact (not shown) that is separated from the movable contact 51. Further, the movable contact 51 and the fixed contact are electrically connected to one terminal plate 61, 62, respectively. That is, the electrical connection between the terminal boards 61 and 62 is turned on and off as the movable contact 51 and the fixed contact are separated from each other. Each of the terminal plates 61 and 62 is made of a metal plate whose thickness direction is in the left-right direction, and is fixed to the housing 3 such that the upper end portion protrudes out of the housing 3. The movable contact 51 is fixed to the upper end of the leaf spring 7 with the thickness direction in the left-right direction and the lower end fixed to the right surface of the terminal plate 61, so that the left and right sides of the fixed contact with respect to the housing 3. It can be displaced elastically.

  Furthermore, this embodiment is provided with the card | curd 8 which interlocks the movable contact 51 with the armature 2 by being connected with said leaf | plate spring 7 and the armature 2. FIG. The terminal board 61 connected to the movable contact 51 is shaped to avoid the path of the card 8 so as not to hinder the displacement of the card 8. The connection between the armature 2 or the leaf spring 7 and the card 8 is achieved, for example, by inserting a part of the armature 2 or the leaf spring 7 into a recess (not shown) provided in the card 8. The housing 3 is provided with an operation window 32 for exposing a part of the card 8, and a contact (open / close) can be opened or closed by inserting a jig (not shown) or the like through the operation window 32. Is possible.

  Here, as shown in FIG. 3, in the fixed portion 41 of the support body 4, in the up-down direction, which is a direction orthogonal to the displacement direction (left-right direction) of the movable contact 51 and the axial direction (front-back direction) of the shaft portion 42. On both sides of the shaft portion 42, there are provided through-holes 40 that are concentric with the shaft portion 42 and penetrate in the front-rear direction.

  The shape of the through hole 40 is not limited to the arc shape as described above, but may be a rectangular shape as shown in FIG. 4A, or a triangular shape as shown in FIGS. 4B and 4C. It may be. However, the inner peripheral surface of the through hole 40 is configured with a curved surface as shown in FIG. 3 rather than the inner peripheral surface of the through hole 40 with a flat surface as shown in FIGS. It is desirable because stress is relatively difficult to concentrate.

  According to the above configuration, as shown in FIG. 5, compared to the case where the through hole 40 is not provided in the support 4, elastic deformation of the support 4 that tilts the shaft portion 42 in the vertical direction is likely to occur. Even when an impact is applied, the stress is absorbed by the elastic deformation described above, so that it is difficult for damage to occur. That is, the impact resistance can be improved.

  Further, since the vertical direction, which is the direction in which the tip (front end) of the shaft portion 42 is displaced by the elastic deformation, is orthogonal to the left-right direction, which is the displacement direction of the movable contact 51 with respect to the fixed contact, the elastic deformation described above. It is relatively difficult to affect the operation of the armature 2.

  Even when the through hole 40 is provided only on one of the upper and lower sides of the shaft portion 42, the elastic deformation is more likely to occur than when the through hole 40 is not provided. It is desirable to provide on both sides of 42.

  In the present embodiment, two sets of the fixed magnetic pole portion 21a and the variable magnetic pole portion 11a are provided on each of the upper and lower sides of the shaft portion 42. For example, the fixed magnetic pole portion 21a and the variable magnetic pole portion 11a are provided. The present invention can also be applied to the case where the shaft portion 42 is provided only on one of the upper and lower sides.

DESCRIPTION OF SYMBOLS 1 Electromagnet 2 Armature 3 Housing 4 Support body 20 Bearing hole 40 Through hole 41 Fixed part 42 Shaft part 51 Movable contact

Claims (2)

An electromagnet,
An armature driven by the magnetic force of the electromagnet and rotatable relative to the electromagnet;
A movable contact linked to the armature;
A stationary contact to which the movable contact is separated from the armature as it rotates,
A housing in which the electromagnet, the armature, the movable contact, and the fixed contact are respectively housed, and the electromagnet and the fixed contact are fixed;
A support portion that has a fixed portion that is fixed to the housing and a cylindrical shaft portion that is inserted into a bearing hole of the armature and rotatably supports the armature;
In the support, at least one of the positions sandwiching the shaft portion in a direction orthogonal to the displacement direction of the movable contact and the shaft direction of the shaft portion is provided with a through-hole penetrating in the axial direction of the shaft portion, respectively. Electromagnetic relay characterized by being.   The electromagnetic relay according to claim 1, wherein an inner peripheral surface of the through hole is a curved surface.

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