JP5995078B2 - Electromagnetic relay - Google Patents

Description

  The present invention relates to an electromagnetic relay.

  2. Description of the Related Art Conventionally, an electromagnetic relay that incorporates an adjustment spring that adjusts operating characteristics is known (for example, see Patent Document 1). In the electromagnetic relay described in Patent Document 1, an insulating space is formed between the contact mechanism portions, and an adjustment spring for adjusting operating characteristics is disposed in the insulating space.

JP 2000-257882 A

  However, in the electromagnetic relay described in Patent Document 1, since the operation characteristics are adjusted at the upper end of the adjustment spring, the dimensional change of the card position occurs only below the bending dimension, and it is difficult to adjust the operation characteristics. In addition, the card moves up and down, and the position where the card is pressed may be shifted.

  Therefore, an object of the present invention is to obtain an electromagnetic relay that can easily adjust the operating characteristics.

  The present invention is an electromagnetic relay, an electromagnet, an armature that is driven by the magnetic force of the electromagnet and is rotatable with respect to the electromagnet, a card that moves linearly when pressed by the armature, and interlocks with the card A movable contact; a fixed contact that the movable contact is separated from or in contact with the rotation of the armature; and the electromagnet, the armature, the card, the movable contact, and the fixed contact, and the electromagnet and the fixed contact. A fixed housing, and the armature includes at least one armature made of a magnetic material, and a connecting piece made of a plastically deformable material and interposed between the armature and the card, An adjustment unit for adjusting operation characteristics is provided between an attachment position where the connecting piece is attached to the armature and the card position. To.

  Moreover, in this invention, the said connection piece may be bent by S shape, and may exhibit a spring force in the said attachment position side rather than the bending part which comprises the S shape.

  In the present invention, the connecting piece has a first straight portion on the armature side with the bent portion interposed therebetween, and has a second straight portion on the card side with the bent portion interposed therebetween, The length of one straight line portion may be longer than the length of the second straight line portion.

  In the present invention, the bent portion may contact one surface of the card.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the electromagnetic relay which can make adjustment of an operating characteristic easy.

FIG. 1 is a front view in which a cover of an electromagnetic relay according to an embodiment of the present invention is omitted. FIG. 2 is a front view showing an open state of the electromagnetic relay shown in FIG. FIG. 3 is a front view in which a cover of an electromagnetic relay shown as a comparative example of the present invention is omitted. FIG. 4 is an enlarged view of a connecting piece provided in the electromagnetic relay shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, below, while attaching | subjecting a common code | symbol to the same component, the overlapping description is abbreviate | omitted.

(Configuration of electromagnetic relay)
FIG. 1 is a front view in which a cover of an electromagnetic relay according to an embodiment of the present invention is omitted. In this electromagnetic relay, the armature 2 connected to the movable contact 51 is rotationally driven by the magnetic force of the electromagnet 1 to bring the movable contact 51 into and out of contact with the fixed contact 52. Specifically, as shown in FIG. 1, 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 are provided. . Hereinafter, the top, bottom, left, and right are based on FIG. 1, and the front side of FIG. 1 is called the front side. However, this direction is defined for convenience of explanation only, and does not necessarily match the direction 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. A support 4 that supports the armature 2 so as to be rotatable with respect to the housing 3 is fixed 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. In the armature 2, a bearing hole 20 having a circular cross-section and having an inner diameter slightly larger than the outer diameter of the shaft portion 42 is provided through the front and rear. By inserting the shaft portion 42 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 facing 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 (three in the figure) of coil terminals 60 having one end electrically connected to the coil and the other end protruding to the left of the housing 3. Energize to. The electromagnetic relay shown in FIG. 1 is a so-called two-winding latching type, and the coil has a tap. One coil terminal 60 is electrically connected to each end of the coil and the tap.

  The armature 2 has one set of fixed magnetic pole portions 21a sandwiching the variable magnetic pole portion 11a from the left and right at both upper and lower ends. In each set of fixed magnetic pole portions 21a, the left fixed magnetic pole portion 21a and the right fixed magnetic pole portion 21a of the variable magnetic pole portion 11a are magnetized to have different polarities. Specifically, the armature 2 includes two permanent magnets 22 having N poles oriented in a common direction in the left-right direction and two armatures 21 made of a magnetic material inserted into the synthetic resin molded body 23. It has been molded. Each armature 21 has a flat rectangular parallelepiped shape, and one surface in the thickness direction is magnetically attached to one pole of each permanent magnet 22. That is, the upper and lower end portions of the armatures 21 that protrude above and below the permanent magnet 22 are the fixed magnetic pole portions 21a. 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 on the side corresponding to the energization direction. Thereby, the armature 2 rotates with respect to the housing 3 in the direction according to the energization direction to the coil. Once the coil is energized, the position of the armature 2 (and the position of the movable contact 51 and the like linked thereto) is maintained (latching) by the magnetic force of the permanent magnet 22 until a current in the reverse direction is passed through the coil. )

  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 52 that is separated from the movable contact 51. The movable contact 51 and the fixed contact 52 are electrically connected to the terminal plates 61 and 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 52 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 so that the upper end portion protrudes outside the housing 3. The movable contact 51 is electrically and mechanically connected to the terminal board 61 via the contact holder 7. The contact holding body 7 is formed by stacking a plurality of contact holding springs 71 made of plate springs that are vertically long as a whole in the thickness direction and joined to each other at an upper end portion and a lower end portion. The lower end portion of the contact holder 7 is fixed to the right surface of the terminal board 61, and the upper end portion of the contact holder 7 can be elastically deformed so as to be displaced left and right with respect to the lower end portion. The movable contact 51 is fixed to the upper end portion of the contact holder 7 so that it can be elastically displaced left and right relative to the housing 3 on the left side of the fixed contact 52.

  The armature 2 and the movable contact 51 are interlocked by a card 8 connected to the contact holder 7 and the armature 2. The card 8 as a whole has a flat shape with the thickness direction directed in the vertical direction, and is guided by the inner surface of the housing 3 so as to be parallel to the housing 3 so as to be movable in the lateral direction. 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 and the card 8 is achieved by a connection piece 24 described later. Further, the connection between the contact holder 7 and the card 8 is achieved by inserting the upper end portion of the contact holder 7 into a contact holder recess (not shown) opened in the vertical direction and rearward of the card 8. Has been. A card ball contact portion 72 that is inclined so as to be separated from the other contact holding springs 71 and elastically contacts the rightward inner surface of the contact holding member recess is provided at the upper end portion of the left end contact holding spring 71.

  As shown in FIG. 1, when the armature 2 rotates clockwise to the limit of the movable range and the movable contact 51 contacts the fixed contact 52 (hereinafter referred to as “closed state”), the card ball contact portion 72. Due to this elastic deformation, contact pressure is generated between the movable contact 51 and the fixed contact 52. As shown in FIG. 2, when the armature 2 rotates counterclockwise to the limit of the movable range and the movable contact 51 is separated from the fixed contact 52 (hereinafter referred to as “open state”), the contact is maintained. The body 7 as a whole is elastically deformed so as to displace the upper end portion to the left relative to the lower end portion, and the spring force is directed to bring the movable contact 51 closer to the fixed contact 52. That is, as the amount of elastic deformation increases, the minimum value of current to be input to the coil of the electromagnet 1 for the transition to the closed state (hereinafter referred to as “minimum on-current”) decreases.

(Characteristic adjustment structure)
Hereinafter, the characteristic adjustment structure for adjusting the operation characteristic will be described in detail.

  FIG. 3 is a front view in which a cover of an electromagnetic relay shown as a comparative example of the present invention is omitted. As shown in this figure, the armature 2 has a connecting piece 24 that is connected to the right armature 21 and protrudes above the armature 21. The connecting piece 24 is inserted into the armature recess 81 of the card 8. The connecting piece 24 is made of a plastically deformable material, has a plate shape whose thickness dimension is smaller than that of the armature 21, and has a thickness direction oriented in a direction perpendicular to the rotation axis of the armature 2. . As means for joining the connecting piece 24 to the armature 21, for example, known means such as caulking, fitting, and welding can be appropriately used. As a material of the connecting piece 24, for example, a non-magnetic material such as aluminum is preferably used. According to such a configuration, the operating characteristics (for example, minimum on-current, contact pressure in the closed state, etc.) can be obtained by plastically deforming the connecting piece 24 that is smaller in thickness than the armature 21 and is easily deformed. Can be adjusted.

  For example, when the connecting piece 24 is bent so that the position of the card 8 is on the right side (that is, when the upper end portion of the connecting piece 24 is displaced to the right with respect to the lower end portion), the card Since the deformation amount of the contact portion 72 becomes larger, a higher contact pressure can be obtained. On the other hand, since the deformation amount of the contact holder 7 in the open state as a whole becomes smaller, the minimum on-current becomes larger.

  Conversely, when the connecting piece 24 is bent so that the position of the card 8 is on the left side (that is, when the upper end portion of the connecting piece 24 is displaced to the left with respect to the lower end portion), the card in the closed state. Since the deformation amount of the elastic contact portion 72 becomes smaller, the contact pressure becomes lower. On the other hand, since the deformation amount of the contact holder 7 in the open state as a whole becomes larger, the minimum on-current can be further reduced.

  Here, when viewed from the front, which is a direction parallel to the rotation axis of the armature 2, a line connecting the contact position between the armature 2 (connecting piece 24) and the card 8 and the rotation axis of the armature 2 is in the displacement direction of the card 8. The angle formed with respect to this will be referred to as the “drive angle”. The greater the difference between this drive angle and 90 °, the greater the component of the rotational force of the armature 2 that acts as a force that pushes the card 8 up or down. When this component force increases, the frictional force acting between the connecting piece 24 and the card 8 or between the card 8 and the inner surface of the housing 3 also increases, so that the driving force (to the electromagnet 1) required for switching the contacts on and off is increased. Input power) increases.

  Therefore, in the comparative example shown in FIG. 3, the connecting piece 24 is bent so that the drive angle is close to 90 °. Specifically, the end portion on the card 8 side is on the armature 21 side in correspondence with the rotation axis of the armature 2 (that is, the central axis of the shaft portion 42) being located on the left side of the movable range of the armature recess 81. The connecting piece 24 is bent into an S-shape so as to be located on the left side of the end portion. As a result, the frictional force acting between the connecting piece 24 and the card 8 or between the card 8 and the inner surface of the housing 3 is reduced as compared with the case where the connecting piece 24 is not bent. It is possible to further reduce the power required for the operation.

  However, according to the comparative example shown in FIG. 3, as indicated by an arrow D <b> 1, the spring force is mainly exerted at the upper end portion of the connecting piece 24, and the operating characteristics are adjusted at the upper end portion of the connecting piece 24. Therefore, the dimensional change of the card position occurs only below the bending dimension, and it may be difficult to adjust the operating characteristics. Further, as indicated by the arrow D2, the card 8 may move up and down, and the position where the card 8 is pressed may be shifted.

  Therefore, in the electromagnetic relay according to the embodiment of the present invention, as shown in FIG. 1, the adjustment unit 6 is provided between the attachment position of the connecting piece 24 (hereinafter simply referred to as “attachment position”) and the card position. Yes. Although the details will be described later, the adjustment unit 6 is a main part for adjusting the operation characteristics. When the adjustment unit 6 is provided between the attachment position and the card position, as shown by an arrow D3, a spring force is mainly exerted between the attachment position and the card position, and the operation is performed between the attachment position and the card position. The characteristics will be adjusted.

  FIG. 4 is an enlarged view of the connecting piece 24 provided in the electromagnetic relay shown in FIG. The point that the connecting piece 24 is bent into an S shape is the same as that of the comparative example, but the configuration of each part constituting the S shape is different from that of the comparative example. That is, the connecting piece 24 includes a tip 24a attached to the armature 4, a first straight portion 24b continuous to the tip 24a, a bent portion 24c continuous to the first straight portion 24b, and a bent portion 24c. A second linear portion 24d that is continuous. Specifically, the tip 24a is attached to the right side surface of the armature 4, and the first straight portion 24b is raised from this attachment position. Then, the first straight portion 24b is bent so as to be substantially parallel to the upper surface of the armature 4, the second straight portion 24d is further raised across the bent portion 24c, and the upper end portion of the second straight portion 24d is placed on the card 8. Are fitted into the recesses 81 for the armature. The length L1 of the first straight part 24b is preferably longer than the length L2 of the second straight part 24d. According to such a configuration, the spring force is exerted mainly on the attachment position side with respect to the bending portion 24c, and the operation characteristics are adjusted between the bending portion 24c and the attachment position. That is, the adjustment part 6 (first straight part 24b) is provided between the bent part 24c and the attachment position.

  FIG. 2 is a front view showing an open state of the electromagnetic relay shown in FIG. That is, when the armature 2 rotates counterclockwise, the connecting piece 24 connected to the armature 21 of the armature 2 also rotates counterclockwise, and the card 8 connected to the connecting piece 24 moves to the left. Thereby, as shown in FIG. 2, since the bending part 24c of the connection piece 24 contacts the lower surface 8a of the card | curd 8, the motion of the card | curd 8 is suppressed and it can prevent that the card | curd 8 falls.

  As described above, in the present embodiment, the connecting piece 24 is attached to the armature 4 and the adjusting unit 6 is provided between the attachment position and the card position. In this way, the operation characteristics are adjusted between the mounting position and the card position. Therefore, the dimensional change of the card position occurs more than the bending dimension, and the operation characteristics can be easily adjusted.

  Specifically, the connecting piece 24 is bent into an S shape, and exerts a spring force on the attachment position side with respect to the bent portion 24c constituting the S shape. With such a simple configuration, it is possible to facilitate adjustment of operation characteristics.

  In the present embodiment, the connecting piece 24 has the first straight portion 24b on the armature 4 side with the bent portion 24c interposed therebetween, and the second straight portion 24d on the card 8 side with the bent portion 24c interposed. The length L1 of the first straight part 24b is longer than the length L2 of the second straight part 24d. In this way, workability can be facilitated.

  In the present embodiment, the bent portion 24 c comes into contact with the lower surface 8 a of the card 8. As a result, the movement of the card 8 can be suppressed and the card 8 can be prevented from lowering, so that characteristic fluctuation can be prevented.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made. For example, FIG. 1 illustrates a configuration in which the upper end portion of the second linear portion 24d is fitted into the card 8, but the upper end portion of the second linear portion 24d may slightly protrude from the card 8. Further, instead of bringing the connecting piece 24 into direct contact with the armature 21 or the card 8, a separate member may be further interposed between the connecting piece 24 and the card 8 or between the armature 21 and the connecting piece 24. . Of course, the attachment position of the connecting piece 24 and the detailed specifications (shape, size, layout, etc.) of the connecting piece 24 can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 Electromagnet 2 Armature 3 Housing 6 Adjustment part 8 Card 8a Card lower surface (one side)
21 armature 24 connecting piece 24b first linear portion 24c bent portion 24d second linear portion 51 movable contact 52 fixed contact

Claims (4)

An electromagnet,
An armature driven by the magnetic force of the electromagnet and rotatable relative to the electromagnet;
A card that moves linearly when pressed by the armature;
A movable contact linked to the card;
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 card, the movable contact, and the fixed contact are housed and the electromagnet and the fixed contact are fixed;
The armature has at least one armature made of a magnetic material, and a connecting piece made of a plastically deformable material and interposed between the armature and the card,
An electromagnetic relay characterized in that an adjustment unit for adjusting operating characteristics is provided between an attachment position where the connecting piece is attached to the armature and the card position.   2. The electromagnetic relay according to claim 1, wherein the connecting piece is bent into an S shape and exerts a spring force on the attachment position side with respect to a bent portion constituting the S shape. The connecting piece has a first straight portion on the armature side with the bent portion interposed therebetween, and a second straight portion on the card side with the bent portion interposed therebetween,
3. The electromagnetic relay according to claim 1, wherein a length of the first straight line portion is longer than a length of the second straight line portion.   The electromagnetic relay according to any one of claims 1 to 3, wherein the bent portion is in contact with one surface of the card.

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