JP2010033721A - Electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic relay for increasing the positioning accuracy of a fixed contact. <P>SOLUTION: A body section 2 includes a pair of support projections 15, 16 provided integrally with the body section 2 for supporting a first and a second fixed arm 13, 14, respectively, by projecting toward the other side of a central shaft C in its axial direction (Z-direction). A space S is provided between the pair of support projections 15, 16 and in a position on one side of a movable contact 10 along the Z-direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electromagnetic relay.

  As a conventional electromagnetic relay, a fixed arm having a fixed contact is fixed to a bobbin that accommodates an iron core and winds a winding.

  However, in such an electromagnetic relay, the bobbin is deformed when the iron core and the yoke are caulked, and as a result, the position of the fixed contact may shift.

In contrast, in the electromagnetic relay disclosed in Patent Document 1, a fixed arm having a fixed contact is fixed to a terminal fixing base instead of a bobbin. For this reason, the above-mentioned problem due to the holding of the fixed arm on the bobbin is less likely to occur.
Japanese Patent Laid-Open No. 6-139891

  However, in the electromagnetic relay of Patent Document 1, since the fixed arm is fixed to the main body via the terminal fixing base, the position of the fixed contact is caused by the displacement of the terminal fixing base with respect to the main body and the accumulation of errors. There was a case. In addition, there is a problem that the gap between the terminal fixing base and the fixed contact is small and it is difficult to adjust the position of the fixed contact.

  Therefore, an object of the present invention is to obtain an electromagnetic relay that can further improve the positional accuracy of a fixed contact.

  In the invention of claim 1, an electromagnet portion that includes an iron core and a winding wound around the iron core and is fixed to the main body at a portion that is one side of the central axis of the iron core. A movable arm disposed on the other side in the axial direction with respect to the iron core and driven to reciprocate along the axial direction by switching of the magnetic force by the electromagnet unit, and provided at the tip of the movable arm and the above A movable contact that is disposed radially outside the central axis with respect to the electromagnet portion and reciprocates in the axial direction; a first fixed contact provided on the other side in the axial direction with respect to the movable contact; A first fixed arm having a first fixed contact at a tip portion; a second fixed contact provided on one side in the axial direction with respect to the movable contact; and the second fixed contact at a tip portion. A second fixed arm, and At least the distal end portion of the second fixed arm extends in a direction close to each other along a direction substantially orthogonal to the axial direction and substantially orthogonal to the extending direction of the distal end portion of the movable arm, to the winding. In the electromagnetic relay that switches between the state in which the movable contact contacts the first fixed contact and is conductive by switching the energized state of the first contact and the state in which the movable contact contacts and conducts the second fixed contact. A pair of support protrusions that protrude toward the other side in the axial direction and that support the first and second fixing arms are provided integrally with the main body, and are between the pair of support protrusions. A gap is provided at a position on one side in the axial direction with respect to the movable contact.

  According to the invention of claim 2, the one of the first and second fixed arms corresponding to each of the pair of support protrusions in the direction opposite to the protruding direction of the tip of the movable arm. It is characterized in that a slit for inserting and fitting is formed.

  According to the first aspect of the present invention, since the first and second fixed arms are supported by the support protrusions provided integrally with the main body, the first and second fixed arms are supported by the bobbin and other parts. Compared to the case, the positional accuracy of the first and second fixed contacts can be increased. Further, the gap provided between the pair of support protrusions can be secured as a space for adjusting the position of the first and second fixed contacts, and the positional accuracy of the first and second fixed contacts can be further increased. It becomes easy to raise.

  According to the second aspect of the present invention, the first and second fixed arms can be attached to the support protrusion relatively easily while avoiding interference with other parts.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of an electromagnetic relay according to the present embodiment, showing a non-operating state of an electromagnet part, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3, and FIG. 5 is a perspective view of a portion provided with a contact of an electromagnetic relay. For convenience, the horizontal direction in FIGS. 1 and 3 is referred to as the X direction, the horizontal direction in FIGS. 2 and 4 is referred to as the Y direction, and the vertical direction in FIGS. The X direction, the Y direction, and the Z direction are perpendicular to each other. Furthermore, regarding the Z direction, the lower side in FIGS. 1 to 5 is the one side in the Z direction, and the upper side is the other side in the Z direction. Below, it illustrates about the electromagnetic relay 1 with which the board | substrate along XY plane is mounted | worn.

  The main body 2 includes a bottom wall 2a having a substantially rectangular plate shape along the XY plane, and the electromagnet 3 is attached on the bottom wall 2a. In the present embodiment, terminals 6t, 9t, 13t, and 14t projecting outward from the bottom wall portion 2a along the Z direction (lower side in the Z direction in FIGS. 1 to 5) are formed on the substrate (not shown). The electromagnetic relay 1 is mounted on the board by being inserted into the through hole and soldered to the conductor on the board. Further, a claw portion 2b for locking a cover (not shown) is provided on the peripheral edge portion of the bottom wall portion 2a.

  The electromagnet portion 3 is formed by winding a substantially cylindrical iron core 5, a bobbin 4 made of an insulating resin that accommodates the iron core 5, and a lead wire that is covered with insulation around the cylindrical portion 4 b of the bobbin 4. A coil portion 6.

  The bobbin 4 includes a cylindrical portion 4b extending along the Z direction, and a substantially disc-shaped flange portion 4a disposed in a posture substantially perpendicular to the Z direction on both sides in the axial direction (that is, the Z direction) of the cylindrical portion 4b. 4c. The iron core 5 is accommodated in the cylinder of the cylindrical part 4b. The extending direction of the central axis C of the iron core 5 and the cylindrical portion 4b is the Z direction. That is, in the present embodiment, the Z direction corresponds to the axial direction of the present invention.

  The end 5b on the other side in the Z direction of the iron core 5 is expanded in diameter and protrudes radially in the Z direction outside (upper side in FIGS. 1 to 5) of the flange portion 4c of the bobbin 4.

  The yoke 7 is formed by bending a strip-like member made of a magnetic material into a substantially L shape, and includes a bottom wall portion 7 a along the flange portion 4 a on one side in the Z direction of the bobbin 4, and the coil portion 6. It has a vertical wall portion 7b extending outside the diameter along the central axis C substantially parallel to the iron core 5. And the end part 5a of the Z direction one side of the iron core 5 is inserted by the through-hole 7c formed in the bottom wall part 7a, and is fixed to the electromagnet part 3 by this.

  Further, a strip-like movable arm 9 made of a conductive material having elasticity (spring property) is attached to the vertical wall portion 7b of the yoke 7. The movable arm 9 includes a vertical plate portion 9a extending along the Z direction, and a top plate portion 9b extending substantially along the Y direction by bending at a substantially right angle at the other end of the vertical plate portion 9a in the Z direction. ,have. The vertical plate portion 9a extends in close contact with the outer surface of the central wall C of the vertical wall portion 7b. The top plate portion 9b is disposed on the other side in the Z direction with respect to the iron core 5, and extends along a direction that intersects with an extension line of the central axis C and is substantially perpendicular to the central axis C. Yes.

  A strip-shaped armature 8 made of a magnetic material is attached to the top plate portion 9b in close contact with the top plate portion 9b on the iron core 5 side. One end portion in the longitudinal direction of the armature 8 (the left end portion in FIGS. 1 and 3) is in contact with the other side in the Z direction of the vertical wall portion 7b of the yoke 7, while the other end portion in the longitudinal direction (FIG. 1). , The right end in FIG. 3) is arranged with an appropriate gap from the end 5 b of the iron core 5.

  The top plate portion 9b of the movable arm 9 extends from the bending point with the vertical plate portion 9a in the radial direction of the central axis C, passes over the extension line of the central axis C, and extends radially outward. The movable contact 10 is fixed to 9c. Note that the tip portion 9c extends substantially along the radially outward direction of the central axis C.

  In the above configuration, when the winding forming the coil portion 6 is energized, the armature 8 is attracted to the end portion 5b on the other side of the iron core 5 in the Z direction, and the top plate portion 9b of the movable arm 9 together with the armature 8. Moves toward one side in the Z direction (the lower side in FIGS. 1 to 5), and the state shown in FIGS. 2 and 4 is obtained. When energization of the winding is released, the top plate portion 9b returns to the other side in the Z direction (upper side in FIGS. 1 to 5) by the elasticity (spring force) of the movable arm 9, and is in the state shown in FIGS. It becomes. In this way, in this embodiment, the top plate portion 9b of the movable arm 9 is reciprocated by switching the magnetic force of the electromagnet portion 3.

  In the state shown in FIGS. 1 and 3, the movable contact 10 comes into contact with the first fixed contact 11 disposed on the other side in the Z direction (the upper side in FIGS. 1 to 5) with respect to the movable contact 10. 2 and 4, in contact with the second fixed contact 12 disposed on one side in the Z direction (the lower side of FIGS. 1 to 5) with respect to the movable contact 10, the connection is made. It is supposed to be. Therefore, depending on whether or not the electromagnet unit 3 is energized, the movable contact 10 is brought into contact with the first fixed contact 11 and conducted, and the movable contact 10 is brought into contact with the second fixed contact 12 and conducted. Can be switched. In the present embodiment, the first fixed contact 11 that is in contact with the movable contact 10 when the electromagnet unit 3 is not in operation is normally closed (NC contact), and the second fixed contact 12 that is not in contact with the movable contact 10. Becomes a normally open contact (NO contact).

  As shown in FIGS. 2 and 4, the first and second fixed contacts 11 and 12 are fixed to the tip portions 13 c and 14 c of the first and second fixed arms 13 and 14, respectively. These first and second fixed arms 13 and 14 are each formed in a strip shape, and are vertical plates extending along the Z direction at both ends in the Y direction (left and right ends in FIGS. 2 and 4). Part 13a, 14a, and horizontal plate part 13b, 14b which bends in the Z direction other end side of the vertical plate part 13a, 14a, and extends along a Y direction. And from FIG.2 and FIG.5, although the front-end | tip parts 13c and 14c of the horizontal board parts 13b and 14b differ in the position of a Z direction, they are substantially orthogonal to the Y direction (namely, Z direction (axial direction of the central axis C), In addition, it can be understood that they extend in parallel to each other along the X direction (the direction substantially perpendicular to the extending direction of the distal end portion 9c of the movable arm 9) and in directions close to each other.

  The first and second fixed arms 13 and 14 are attached to a pair of support protrusions 15 and 16 extending from the bottom wall portion 2a of the main body 2 to the other side in the Z direction integrally with the main body 2. ing. The pair of support protrusions 15 and 16 are provided in a substantially prismatic shape at both ends in the Y direction of the bottom wall portion 2a toward the other side in the Z direction. A gap S is provided between the support protrusions 15 and 16. The gap S is provided at least at a position on one side in the Z direction with respect to the movable contact 10.

  In addition, slits 15s and 16s substantially along the XY plane are formed at the tip portions 15a and 16a of the pair of support projections 15 and 16, and the horizontal plate portions 13b of the first and second fixing arms 13 and 14 are formed. 14b is inserted and fitted into the corresponding slits 15s and 16s in the direction opposite to the protruding direction of the distal end portion 9c of the movable arm 9 (in the direction of arrow I in FIG. 5).

  As described above, in the present embodiment, a pair of supports that protrude toward the other side of the axial direction (Z direction) of the central axis C and support the first and fixed arms 13 and 14 in the main body 2. The protrusions 15 and 16 are provided integrally with the main body 2, and a gap S is provided at a position between the pair of support protrusions 15 and 16 and on one side in the Z direction with respect to the movable contact 10. Therefore, compared with the case where the 1st and 2nd fixed arms 13 and 14 are supported by the bobbin and other parts, the position accuracy of the 1st and 2nd fixed contacts 11 and 12 can be raised. Further, a space for adjusting the position of the gap S provided between the pair of support protrusions 15 and 16 by slightly bending the movable arm 9 and the fixed arms 13 and 14 appropriately (adjusted fixed arm 13 and 14 and a space for arranging the fixed contacts 11 and 12 and a space for inserting tools, fingers and the like, and the positional accuracy of the first and second fixed contacts 11 and 12 can be further enhanced.

  Further, in the present embodiment, the first and second fixed arms 13, 14 are provided on the pair of support protrusions 15, 16 in the direction opposite to the protruding direction (I direction) of the distal end portion 9 c of the movable arm 9. Slits 15s and 16s were formed by inserting the corresponding ones. Therefore, the first and second fixed arms 13 and 14 can be relatively easily paired with the pair of support protrusions 15 while avoiding interference with other components (such as the electromagnet portion 3, the movable arm 9, and the bottom wall portion 2a). , 16 can be mounted.

  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, the positions of the first and second fixed contacts may be reversed in the Y direction, and the configuration of other parts is not limited to the above embodiment.

It is a side view of the electromagnetic relay concerning one Embodiment of this invention, Comprising: It is a figure which shows the non-operation state of an electromagnet part. It is II-II sectional drawing of FIG. It is a side view of the electromagnetic relay concerning one Embodiment of this invention, Comprising: It is a figure which shows the operating state of an electromagnet part. It is IV-IV sectional drawing of FIG. It is a perspective view of the part which provided the contact of the electromagnetic relay concerning one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic relay 2 Main body part 3 Electromagnet part 5 Iron core 6 Coil part 9 Movable arm 9c Tip part (movable arm)
10 movable contact 11, 12 fixed contact 13 first fixed arm 14 second fixed arm 13c (first fixed arm) tip 14c (second fixed arm) tip 15, 16 pair of support protrusions 15s , 16s Slit C Center axis S Air gap

Claims (2)

An electromagnet portion including a core and a winding wound around the iron core, the electromagnet portion being fixed to the main body at a site on one side of the central axis of the iron core, and the axial direction with respect to the iron core A movable arm disposed on the other side of the movable arm and driven to reciprocate along the axial direction by switching of magnetic force by the electromagnet portion, and provided at a tip portion of the movable arm and having a diameter of the central axis with respect to the electromagnet portion A movable contact disposed on the outer side in the axial direction and reciprocating in the axial direction; a first fixed contact provided on the other side in the axial direction with respect to the movable contact; and the first fixed contact at a tip portion. A first fixed arm, a second fixed contact provided on one side in the axial direction with respect to the movable contact, and a second fixed arm having the second fixed contact at a tip portion, Less of said first and second fixed arms The tip portion extends in a direction close to each other along a direction substantially perpendicular to the axial direction and substantially perpendicular to the extending direction of the tip portion of the movable arm, and switches the energization state of the winding. In the electromagnetic relay for switching between the state in which the movable contact is in contact with the first fixed contact and conducting and the state in which the movable contact is in contact with the second fixed contact,
A pair of support protrusions are provided on the main body portion so as to protrude toward the other side in the axial direction and support the first and second fixed arms, respectively, and between the pair of support protrusions. And the electromagnetic relay characterized by providing the space | gap in the position used as the one side of the said axial direction with respect to the said movable contact.   A slit is formed in each of the pair of support protrusions to insert and fit the corresponding one of the first and second fixed arms in the direction opposite to the protruding direction of the tip of the movable arm. The electromagnetic relay according to claim 1.

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