JP2012199109A - Electromagnetic switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic switching device capable of downsizing and suppressing occurence of noise due to vibration of a movable contactor.SOLUTION: The electromagnetic switching device includes a contact device 1 having the movable contactor 4 on which a pair of fix contacts 3a, 3a and a movable contact 4a countering each of the fix contacts 3a are provided on one surface side thereof and a movable shaft 5 holding the movable contactor 4 while being inserted in an insertion hole 4c of the movable contactor 4, an electromagnet device 2, connected to the movable shaft 5, which causes the movable contactor 4 to be moved so that the fix contact 3a and the movable contact 4a come in and out of contact with each other, and a vibration suppression part 8 suppressing vibration of the movable contactor 4 by causing the movable contactor 4 and a shaft 5a of the movable shaft 5 to contact with each other.

Description

  The present invention relates to an electromagnetic switching device including a contact device that opens and closes by an operation of an electromagnet device.

  2. Description of the Related Art Conventionally, an electromagnetic switching device including an electromagnet device having an exciting winding and a contact device that opens and closes in conjunction with the operation of the electromagnet device is known (Patent Documents 1 and 2).

  As shown in FIG. 7, the electromagnetic switching device 10 of Patent Document 1 includes a pair of fixed contacts 3a and 3a and movable contacts (not shown) arranged to face each of the fixed contacts 3a on one surface side. ) And a movable shaft 5 used for driving the movable contact 4 to the fixed contact 3a side. Further, the electromagnetic switching device 10 drives the movable iron core 25 that moves the movable contact 4 via the movable shaft 5 by the electromagnetic force generated when the excitation winding 2a is energized to drive the fixed contacts 3a, 3a and the movable contacts. An electromagnet device 2 for contacting and separating the contact is provided.

  The electromagnetic switching device 10 includes a contact pressure spring 6 that biases the movable contact 4 toward the fixed contact 3a, and a return spring 27 that biases the movable contact 4 in a direction away from the fixed contact 3a. Yes. Further, the electromagnetic switching device 10 is joined so that the space surrounded by the housing case 7 that houses the movable contact 4, the yoke plate 26 </ b> A, the guide tube 28, and the coupling body 38 becomes an airtight space.

  The electromagnet device 2 includes a coil bobbin 21 around which the excitation winding 2 a is wound, and a yoke 26 surrounding the coil bobbin 21. The yoke 26 includes a yoke plate 26 </ b> A that contacts the upper end surface side of the coil bobbin 21 and a yoke portion 26 </ b> B that contacts the lower end surface side of the coil bobbin 21.

  In the electromagnetic switch 10 of Patent Document 1, when the movable iron core 25 collides with the fixed iron core 24 by driving the movable iron core 25, the impact of the collision propagates to the cap 45 and the yoke plate 26A that fix the fixed iron core 24. The generation of abnormal noise can be reduced by providing the buffer member 61 that reduces the occurrence of noise.

  In the electromagnetic switching device 10 described above, when the pair of fixed contacts 3a, 3a and the movable contact come into contact with each other, the pair of fixed contacts 3a, 3a and the movable contact side are in a two-point contact. In this case, the movable contact 4 of the electromagnetic switching device 10 may be oscillated around a straight axis passing through two contact portions with which the fixed contact 3a is in contact. The electromagnetic switching device 10 may generate noise due to the vibration of the movable contact 4.

  In the electromagnetic switching device 10 of Patent Document 2, as shown in FIG. 8, the movable iron core 25 moves to the fixed iron core 24 side by energizing the exciting winding 2 a and is fixed by the spring force of the contact pressure spring 6. The contact 3a and the movable contact 4a are in contact with each other, and the movable contact 4 and the movable shaft 5 in contact with the movable contact 4 are separated from each other. The electromagnetic switching device 10 of Patent Document 2 includes a movable contact 4 having a pair of fixed contacts 3a, 3a and a movable contact 4a disposed to face each of the fixed contacts 3a. Further, in the electromagnetic switching device 10, in addition to the two-point contact between the fixed contact 3a and the movable contact 4a, the fixed contact member 3t fixed at a predetermined position, the fixed contact 3a and the movable contact 4a contact each other. And a movable contact member 4t provided on the movable contact 4 that contacts the fixed contact member 3t.

  The electromagnetic switching device 10 of Patent Document 2 is provided with a fixed contact member 3t and a moving contact member 4t at a position shifted from between two contact portions where the pair of fixed contacts 3a and the movable contact 4a contact. Thus, the swing of the movable contact 4 is prevented as a three-point contact.

JP 2007-287525 A JP 2010-257923 A

  However, in the electromagnetic switching device 10 of Patent Document 2, when the fixed contact 3a and the movable contact 4a are in contact with each other, the fixed contact member 3t and the movable contact member 4t are located at positions shifted from between the two contact portions. Need a third set of contact portions. Therefore, the electromagnetic switching device 10 increases the contact resistance due to the dispersion of the pressing force by the contact pressure spring 6 that biases the movable contact 4 toward the fixed contact 3a, and the contact pressure between the fixed contact 3a and the movable contact 4a. There is a risk of non-uniformity. Further, the electromagnetic switching device 10 of Patent Document 2 needs to secure an extra space on each of the movable contact 4 and the fixed contact 3a side in order to form the third set of contact portions, and the shape and structure are complicated. There is a problem that it is difficult to reduce the size.

  The present invention has been made in view of the above-mentioned reasons, and an object thereof is to provide an electromagnetic switching device that can be reduced in size and can suppress the generation of abnormal noise due to vibration of a movable contact. It is in.

  The electromagnetic switching device according to the present invention includes a pair of fixed contacts and a movable contact facing each of the fixed contacts, the movable contact provided on one surface side, and the movable contact inserted through the insertion hole of the movable contact. A contact device having a movable shaft to be held; an electromagnet device connected to the movable shaft to move the movable contact to bring the fixed contact and the movable contact into and away from each other; and a shaft portion of the movable shaft; A vibration suppression unit that suppresses vibration of the movable contact by contacting the movable contact is provided.

  In this electromagnetic switching device, it is preferable that the vibration suppressing portion is a protruding portion that protrudes in the thickness direction of the movable contact at a peripheral portion of the insertion hole.

  In this electromagnetic switching device, it is preferable that the vibration suppressing portion is the shaft portion whose shaft diameter is changed in the thickness direction of the movable contact.

  In the electromagnetic switching device of the present invention, it is possible to reduce the size, and it is possible to suppress the generation of abnormal noise accompanying the vibration of the movable contact.

It is sectional drawing of the electromagnetic switching device of Embodiment 1. FIG. The principal part of an electromagnetic switch apparatus same as the above is shown, (a) is sectional drawing, (b) is a top view. It is a disassembled perspective view of the principal part of an electromagnetic switch apparatus same as the above. It is a disassembled perspective view of an electromagnetic switching device same as the above. It is sectional drawing of the principal part of the electromagnetic switching device of Embodiment 2. It is sectional drawing of the principal part of the electromagnetic switching device of Embodiment 3. It is a schematic sectional drawing of the electromagnetic switching device of a prior art example. The other electromagnetic switchgear of a prior art example is shown, (a) is a longitudinal cross-sectional view, (b) is AA sectional drawing of (a), (c) is a top view which shows the principal part of (b).

(Embodiment 1)
The electromagnetic switching device 10 of this embodiment is demonstrated referring FIGS. 1-4.

  As shown in FIG. 1, the electromagnetic switching device 10 includes a pair of fixed contacts 3 a, 3 a and a movable contact 4 provided with a movable contact 4 a facing each of the fixed contacts 3 a on one surface side, and the movable contact 4. A contact device 1 having a movable shaft 5 that is inserted into the insertion hole 4c and holds the movable contact 4 is provided. The electromagnetic switching device 10 includes an electromagnet device 2 that is connected to the movable shaft 5 and moves the movable contact 4 to contact and separate the fixed contact 3a and the movable contact 4a from each other. In particular, the electromagnetic switching device 10 includes a vibration suppressing unit 8 that suppresses vibration of the movable contact 4 by bringing the shaft 5 a of the movable shaft 5 into contact with the movable contact 4. In the following, each configuration will be described in more detail with the upper, lower, left, and right sides of each drawing as the top, bottom, left, and right.

  The electromagnetic switching device 10 of the present embodiment accommodates the contact device 1 and the electromagnet device 2 in an integral combination in a hollow box-type outer case 11.

  The electromagnet device 2 includes a fixed portion 2b including an excitation winding 2a and a fixed iron core 24 made of a material (for example, silicon steel, permalloy, ferrite, etc.) through which magnetic flux generated by the excitation winding 2a passes. And a movable portion 2c disposed so as to face the core 24. The fixed portion 2b includes a coil bobbin 21 made of a cylindrical synthetic resin material around which the excitation winding 2a is wound, a yoke 26 made of a magnetic metal material (for example, iron) surrounding the coil bobbin 21, and a coil bobbin 21 A columnar fixed iron core 24 disposed inside is provided. The movable portion 2 c includes a columnar movable iron core 25 that is arranged alongside the fixed iron core 24 in the mouth axis direction of the coil bobbin 21 (up and down direction in FIG. 1) inside the coil bobbin 21.

  Similar to the fixed iron core 24, the movable iron core 25 is made of a material (for example, silicon steel, permalloy, ferrite, or the like) through which the magnetic flux generated by the exciting winding 2a passes. In the electromagnet device 2, the yoke 26, the fixed iron core 24, and the movable iron core 25 form a magnetic path through which the magnetic flux generated by the exciting winding 2a passes. The coil bobbin 21 has a cylindrical portion 21c around which the exciting winding 2a is wound, and flanges 21a and 21b that protrude outward from both ends of the cylindrical portion 21c.

  The electromagnet device 2 has both ends of the excitation winding 2a electrically connected to a pair of terminal portions 121 and 121 provided on the flange portion 21a of the coil bobbin 21 (see FIG. 4B). Each terminal portion 121 is electrically connected to the coil terminal 23 via a lead wire 122 (see FIG. 4C). The coil terminal 23 is formed of a conductive material (for example, copper or iron), and a base portion 23a that is electrically connected to the lead wire 122 by solder or the like, and a terminal portion 23b that extends substantially vertically from the base portion 23a. And.

  The yoke 26 in the electromagnetic switching device 10 is a rectangular plate-shaped yoke plate 26 </ b> A (see FIG. 3) that abuts on the upper end surface side of the coil bobbin 21 and a C-shaped yoke that abuts the lower end surface side of the coil bobbin 21. 26B (see FIG. 4B). In addition, the yoke part 26B can be formed continuously and integrally by bending one plate.

  Further, the fixed portion 2b of the electromagnet device 2 includes a bottomed cylindrical guide tube 28 made of a nonmagnetic material and having an opening 28c at the upper end between the fixed iron core 24 and the movable iron core 25 and the coil bobbin 21. (See FIG. 3). The guide tube 28 includes a cylindrical portion 28b and a flange portion 28a provided at the upper end of the cylindrical portion 28b. The electromagnet device 2 houses a fixed iron core 24 and a movable iron core 25 inside a guide cylinder 28 provided inside the cylindrical portion 21 c of the coil bobbin 21. The fixed iron core 24 is disposed on the opening 28c side of the guide tube 28 in the cylindrical portion 28b of the guide tube 28.

  Furthermore, the fixed iron core 24 and the movable iron core 25 are each formed in a columnar shape whose outer diameter is slightly smaller than the inner diameter of the guide cylinder 28. Further, the movable iron core 25 is configured to be movable along the axial direction of the guide tube 28. The moving range of the movable iron core 25 is set between an initial position away from the fixed iron core 24 and a contact position where the movable iron core 24 contacts the fixed iron core 24. The guide cylinder 28 accommodates a return spring 27 made of a coil spring having a spring force in a direction to return the movable iron core 25 to the initial position.

  The return spring 27 is inserted through an insertion hole 24 b formed in the axial direction of the cylindrical fixed iron core 24. In the return spring 27, the lower end of the return spring 27 is in contact with the upper surface side of the movable iron core 25, and the upper end of the return spring 27 is in contact with the lower surface side of a cap member 45 described later. Further, the return spring 27 is provided in a compressed state between the movable iron core 25 and the cap member 45, and elastically biases the movable iron core 25 downward.

  When the movable iron core 25 moves to the contact position, the return spring 27 is compressed and the entire return spring 27 is accommodated in the insertion hole 24b. Therefore, the return spring 27 does not prevent the movable iron core 25 from coming into contact with the fixed iron core 24.

  Further, a first damper portion 29 made of a rubber material having elasticity and formed in a disc shape is provided on the bottom side of the guide tube 28. The first damper portion 29 can absorb the impact transmitted from the movable iron core 25 to the bottom surface of the guide tube 28 when the movable iron core 25 returns to the initial position. Similarly, on the upper surface of the movable iron core 25, a second damper portion 22 made of a rubber material having elasticity and formed in a disk shape is provided. The second damper portion 22 can alleviate an impact transmitted from the movable iron core 25 to the fixed iron core 24 when the movable iron core 25 moves to the contact position.

  Further, the yoke plate 26A has an insertion hole 26c through which the fixed iron core 24 is inserted in the center (see FIG. 3). Furthermore, the yoke plate 26A is provided with a recess 26a that is recessed from the upper surface side of the yoke plate 26A in the peripheral portion of the insertion hole 26c. The fixed iron core 24 is fixed to the yoke plate 26A in a state of being inserted into the insertion hole 26c so that the flange 24a provided on the upper end side protrudes upward from the upper surface of the yoke plate 26A. Furthermore, the fixing | fixed part 2b has the disk-shaped cap member 45 which consists of a metal plate in the upper surface side of 26 A of yoke plates. The cap member 45 includes a convex portion 45a that forms a space for housing the flange portion 24a of the fixed iron core 24 with the concave portion 26a of the yoke plate 26A, and a peripheral portion 45b that is fixed to the yoke plate 26A. The cap member 45 is attached to the yoke 26 by fixing the peripheral portion 45b to the yoke plate 26A so as to cover the insertion hole 26c. That is, the cap member 45 fixes the flange portion 24a of the fixed iron core 24 between the concave portion 26a formed at the approximate center on the upper surface side of the yoke plate 26A and the convex portion 45a of the cap member 45.

  The guide tube 28 has a flange portion 28a fixed around the insertion hole 26c on the lower surface of the yoke plate 26A. Further, the electromagnet device 2 holds the yoke portion 26B that holds the cylindrical bearing cylinder 26D made of a magnetic material in a gap portion between the inner peripheral surface on the lower end side of the coil bobbin 21 and the outer peripheral surface of the guide cylinder 28. It is made to fit from the hole 26b side. In the electromagnet device 2, the guide cylinder 28 and the bearing cylinder 26 </ b> D form a magnetic circuit together with the yoke 26, the fixed iron core 24, and the movable iron core 25.

  Next, the contact device 1 of the electromagnetic switching device 10 housed in the outer case 11 is a housing case as an inner case 7a formed in a bottomed cylindrical shape whose lower surface is opened by a heat-resistant material (for example, a ceramic material). 7 is provided. The housing case 7 includes terminal holes 31 a and 31 a at two locations on the bottom of the housing case 7. A fixed terminal block 33 made of a metal material (for example, copper) and formed in a cylindrical shape is inserted into each terminal hole 31a. In the pair of fixed terminal blocks 33, 33, a fixed contact 3 a is provided at the tip of each fixed terminal block 33. Further, the fixed terminal block 33 is provided with a housing 33a, and the housing 33a and the housing case 7 are brazed. Further, each fixed terminal base 33 is suitably formed with a screw hole 33b so that a lead terminal (not shown) can be screwed.

  In the housing case 7, a long plate-shaped movable contact 4 made of a conductive material (for example, copper) is provided so as to straddle between the pair of fixed contacts 3a, 3a. The movable contact 4 is provided with movable contacts 4a and 4a arranged on one surface side so as to face each of the fixed contacts 3a. An insertion hole 4 c through which the shaft portion 5 a of the movable shaft 5 that connects the movable contact 4 to the movable iron core 25 is inserted is provided at the center of the movable contact 4.

  Here, the contact device 1 of the electromagnetic switching device 10 of the present embodiment causes the shaft 5a of the movable shaft 5 and the inner surface 4b side of the insertion hole 4c of the movable contact 4 to contact each other to swing the movable contact 4. A vibration control unit 8 that suppresses vibrations that move (see thick arrows in FIG. 2A) is provided. Since the contact device 1 includes the vibration suppressing unit 8, vibration that swings around the axis of the straight line L passing through the pair of movable contacts 4 a and 4 a of the movable contact 4 can be suppressed (FIG. 2B). See).

  The vibration suppressing portion 8 is formed by a protruding portion 8a that protrudes in the thickness direction of the movable contact 4 at the peripheral portion of the insertion hole 4c. Such a vibration suppressing portion 8 can be formed relatively easily by burring when the through hole 4c of the movable contact 4 is formed. Further, the vibration suppressing portion 8 is not limited to one formed by burring, but may be one in which the thickness of the movable contact 4 is made thicker than the others in the peripheral portion of the insertion hole 4c.

  The protrusion 8a of the vibration suppressing portion 8 is a case where a force for rotating the movable contact 4 around the shaft portion 5a of the movable shaft 5 is generated due to fluctuations in the current flowing between the fixed contact 3a and the movable contact 4a. However, the rotation can also be suppressed by the frictional force between the inner side surface 4b and the shaft portion 5a.

  The vibration suppressing unit 8 may be formed integrally with the movable contact 4 or may be formed separately from the movable contact 4. In addition, the movable contact 4 moves in order to bring the fixed contact 3a and the movable contact 4a into and out of contact with each other. Therefore, it is preferable that the vibration suppressing unit 8 has a small load with respect to the movement of the movable contact 4. Therefore, even if the vibration suppression part 8 performs the coating (not shown) which reduces the load with respect to the movement of the movable contact 4 on the surface of the shaft 5a of the movable shaft 5 and the inner surface 4b of the movable contact 4 Good.

  The movable contact 4a is formed so that the surface of the movable contact 4a is convex toward the fixed contact 3a and protrudes from one surface side of the movable contact 4. As a result, the movable contact 4a can stabilize the contact between the fixed contact 3a and the movable contact 4a. In order to stabilize the contact between the fixed contact 3a and the movable contact 4a, the surface of either the fixed contact 3a or the movable contact 4a may be formed in a convex shape. Further, the fixed contact 3a and the movable contact 4a are not necessarily convex, but may be formed flat. When the surface of either one of the fixed contact 3a and the movable contact 4a is formed in a convex shape, the movable contact 4 is more susceptible to vibration that swings about a straight axis passing through the pair of movable contacts 4a, 4a. It tends to be easy.

  In addition, the electromagnetic switching device 10 may be subject to deterioration over time in which a part of the fixed contact 3a or the movable contact 4a protrudes due to arc discharge or the like. In this case, the electromagnetic switching device 10 may be susceptible to the vibration described above in the movable contact 4 due to an electromagnetic repulsion phenomenon that occurs when the fixed contact 3a and the movable contact 4a are energized. The electromagnetic switching device 10 of the present embodiment can effectively suppress the vibration of the movable contact 4 by providing the vibration suppressing unit 8.

  Next, the movable shaft 5 is formed of a non-magnetic material, and the shaft portion 5a formed in a round bar shape that is long in the moving direction of the movable iron core 25 (vertical direction in FIG. 1), and the movable contact 4 A head portion 5b that is higher and larger than the insertion hole 4c is preferably provided. The movable shaft 5 is prevented from coming off from the movable contact 4 by the head 5b.

  Further, a contact pressure spring 6 made of a coil spring through which the movable shaft 5 is inserted is provided between the cap member 45 and the movable contact 4. The movable contact 4 is held on the head 5 b of the movable shaft 5 by being pressed upward by the spring force of the contact pressure spring 6. Further, the cap member 45 has a bearing hole 45c through which the shaft portion 5a of the movable shaft 5 is inserted in the center portion.

  Similarly, the fixed iron core 24 is provided with a through-hole 24 b through which the movable shaft 5 passes along the axial direction of the cylindrical fixed iron core 24. Further, the shaft portion 5a of the movable shaft 5 has a tip portion coupled to the movable iron core 25 through the bearing hole 45c and the through hole 24b. A coupling hole 25 a is formed in the movable iron core 25 along the axial direction of the columnar movable iron core 25. The movable iron core 25 is coupled to the movable shaft 5 in such a manner that the tip of the shaft portion 5a is inserted into the coupling hole 25a and fixed. In the electromagnetic switching device 10 of the present embodiment, the distal end portion of the shaft portion 5a of the movable shaft 5 and the movable iron core 25 are coupled by screwing. Thereby, the movable contact 4 can move in the vertical direction (the vertical direction in FIG. 1) in conjunction with the movement of the movable iron core 25.

  Here, when the movable iron core 25 is in the initial position, the movable contact 4a and the fixed contact 3a are separated from each other. On the other hand, when the movable iron core 25 is in the contact position, the movable contact 4a and the fixed contact 3a come into contact with each other. As described above, the positional relationship between the movable iron core 25 and the movable contact 4 is set. The contact device 1 is in an open state when the movable iron core 25 is in the initial position and the movable contact 4a and the fixed contact 3a are separated from each other. Moreover, when the movable iron core 25 exists in a contact position, the contact device 1 will be in a closed state, when the movable contact 4a and the fixed contact 3a contact.

  Before the movable iron core 25 is coupled to the lower end portion of the movable shaft 5, as shown in FIG. 3, the insertion hole 4c of the movable contact 4, the contact pressure spring 6, the insertion hole 39b of the insulating member 39 described later, It is inserted into the through hole 24b of the fixed iron core 24 through the bearing hole 45c of the cap member 45 attached to the yoke plate 26A. Next, the movable shaft 5 is fitted with a return spring 27 to couple the lower end portion of the movable shaft 5 to the movable iron core 25 via the second damper portion 22. The movable shaft 5 has a male screw cut at the tip of the shaft portion 5a. A female screw is cut in the inner surface of the coupling hole 25 a of the movable iron core 25. Therefore, the movable shaft 5 may be screwed and coupled with the movable iron core 25 in the guide cylinder 28 attached to the lower side of the yoke plate 26A.

  In the electromagnetic switching device 10 having the above-described configuration, when the excitation winding 2a is energized, a pair of a surface facing the movable iron core 25 in the fixed iron core 24 and a peripheral portion of the holding hole 26b in the yoke portion 26B. The magnetic pole parts are magnetized with different polarities. Therefore, in the electromagnetic switching device 10, the movable iron core 25 is attracted to the fixed iron core 24 side and moved to the contact position by energizing the exciting winding 2a. Further, when the electromagnetic switching device 10 stops energizing the exciting winding 2 a, the movable iron core 25 is returned to the initial position by the return spring 27.

  That is, when the electromagnetic switching device 10 is not energized to the exciting winding 2a of the electromagnet device 2, the contact device 1 is opened to insulate the pair of fixed terminal blocks 33, 33 from each other. In addition, when the electromagnetic switching device 10 is energized to the exciting winding 2a of the electromagnet device 2, the contact device 1 is closed, whereby the pair of fixed terminal blocks 33 and 33 are electrically connected. Become. The contact pressure between the movable contact 4 a and the fixed contact 3 a is secured by the contact pressure spring 6.

  Further, the electromagnetic switching device 10 is provided with a cylindrical connecting body 38 that covers the gap between the housing case 7 and the yoke plate 26A. The electromagnetic switching device 10 includes the housing case 7, the fixed terminal block 33, and the yoke plate so that the space surrounded by the housing case 7, the fixed terminal block 33, the yoke plate 26 </ b> A, the guide tube 28, and the coupling body 38 is an airtight space. 26A, the guide cylinder 28, and the coupling body 38 are joined. That is, the electromagnetic switching device 10 includes the fixed contact 3a of the fixed terminal block 33, the movable contact 4, the movable shaft 5, the contact pressure spring 6, the insulating member 39, the fixed iron core 24, the return spring 27, and the movable iron core 25. It will be stored in the space.

  Further, the electromagnetic switching device 10 of the present embodiment insulates the arc generated between the fixed contact 3a and the movable contact 4a at the opening of the housing case 7 from the joint between the housing case 7 and the coupling body 38. The insulating member 39 is suitably provided.

  The insulating member 39 is made of an insulating material (for example, a ceramic material or a resin material) and has a bottomed cylindrical shape. In the insulating member 39, the upper end side of the peripheral wall of the insulating member 39 is in contact with the peripheral wall of the housing case 7. The insulating member 39 includes a rectangular frame 39a that can accommodate the convex portion 45a of the cap member 45 at the center of the outer bottom surface on the cap member 45 side (see FIG. 3). The insulating member 39 includes a circular frame 39 c having an outer diameter that is substantially the same as the inner diameter of the contact pressure spring 6 at the center on the inner bottom surface side of the insulating member 39. The insulating member 39 is provided with an insertion hole 39b through which the shaft portion 5a of the movable shaft 5 is inserted in a recess in the circular frame 39c. The insulating member 39 suppresses the displacement of the contact pressure spring 6 by arranging the lower end portion of the contact pressure spring 6 inserted through the shaft portion 5a of the movable shaft 5 inside the circular frame 39c.

  Next, the outer case 11 is formed in a hollow box shape from a resin material, and includes a hollow box type case main body 41 having an upper surface opened, and a cover 42 that covers the opening of the case main body 41. (See FIG. 4). The case body 41 is provided with a flange portion 141 formed with an insertion hole 141a used for fixing the electromagnetic switching device 10 to a predetermined mounting surface (not shown) by screwing at the front ends of the left and right side walls. . Further, the case body 41 has a step portion 41 a formed at the opening peripheral edge on the upper end side of the case body 41. The case body 41 has a smaller outer periphery than the lower end side. The case body 41 has a pair of slits 41b and 41b into which the terminal portion 23b of the coil terminal 23 is fitted on one surface side (lower side of the paper surface in FIG. 4) above the step portion 41a. Further, the case body 41 has a pair of convex portions 41c and 41c arranged in parallel in the left-right direction on the other surface side (upper side of the paper surface of FIG. 4) above the step portion 41a.

  The cover 42 is formed in a hollow box shape having an open bottom surface, and a pair of through holes 42a and 42a into which the convex portions 41c of the case body 41 are fitted when assembled to the case body 41 are formed on the rear surface. . The upper surface of the cover 42 is provided with a partition plate 42 c that divides the upper surface into left and right parts. Further, the cover 42 includes a pair of insertion holes 42b and 42b through which the fixed terminal 33 is inserted on the upper surface divided into two by the partition plate 42c.

  When the contact device 1 and the electromagnet device 2 are housed in the outer case 11, a rectangular flat cushion material 43 having elasticity is provided between the flange portion 21b of the coil bobbin 21 and the bottom surface of the case body 41. It is intervening. Similarly, the outer case 11 is preferably provided with a cushioning material 44 having elasticity, in which insertion holes 44a are formed between the housing case 7 and the cover 42 for inserting the flange portions 33a of the fixed terminals 33, respectively. Disguise.

  The electromagnetic switching device 10 according to the present embodiment includes a vibration suppressing unit 8 that suppresses vibration of the movable contact 4 by bringing the shaft portion 5a of the movable shaft 5 and the movable contact 4 into contact with each other, thereby reducing the size. Therefore, it is possible to suppress the generation of abnormal noise accompanying the vibration of the movable contact 4.

(Embodiment 2)
The electromagnetic switching device 10 of this embodiment shown in FIG. 5 is provided with a protruding portion 8a that protrudes in the thickness direction of the movable contact 4 at the peripheral portion of the insertion hole 4c, like the electromagnetic switching device 10 of the first embodiment. Instead of the suppression unit 8, the difference is that the shaft portion 5 a whose shaft diameter is changed in the thickness direction of the movable contact 4 is the vibration suppression unit 8. Other configurations and functions are the same as those of the first embodiment.

  In the electromagnetic switching device 10 of the present embodiment, as shown in FIG. 5, the shaft diameter of the shaft portion 5 a of the movable shaft 5 is gradually increased from the head portion 5 b which is the end portion side of the movable shaft 5 in the thickness direction of the movable contact 4. A tapered different diameter portion 8b is provided.

  The vibration suppressing unit 8 is in a state where the movable contact 4 is pressed to the fixed contact 3a side by the spring force of the contact pressure spring 6 and the movable contact 4a is brought into contact with each of the pair of fixed contacts 3a, 3a and the fixed contact 3a. The tapered different diameter portion 8b of the shaft portion 5a and the inner side surface 4b of the insertion hole 4c of the movable contact 4 come into contact with each other. Thereby, similarly to the electromagnetic switching device 10 of the first embodiment, the electromagnetic switching device 10 of the present embodiment can suppress the vibration of the movable contact 4. The shape of the different-diameter portion 8b is not limited to a tapered shape in which the shaft diameter gradually decreases from the end side in the thickness direction of the movable contact 4, but a taper in which the shaft diameter is gradually increased from the end side. Various shapes such as a shape can be used.

(Embodiment 3)
The electromagnetic switching device 10 of the present embodiment shown in FIG. 6 includes a protruding portion 8a that protrudes in the thickness direction of the movable contact 4 at the peripheral portion of the insertion hole 4c shown in the first embodiment, and the movable contact shown in the second embodiment. The vibration suppressing portion 8 is configured by combining the shaft portion 5a whose shaft diameter is changed in the thickness direction of the child 4. Other configurations and functions are the same as those in the first and second embodiments.

  In the electromagnetic switching device 10 of the present embodiment, as shown in FIG. 6A, in the thickness direction of the movable contact 4 (downward in FIG. 6A) in the peripheral portion of the insertion hole 4c of the movable contact 4. Vibration is suppressed by the protruding portion 8a protruding and the shaft portion 5a of the movable shaft 5 which has a tapered different diameter portion 8b in which the shaft diameter is gradually reduced from the end side of the movable shaft 5 in the thickness direction of the movable contact 4. Part 8 is configured. In the vibration suppression unit 8 of the electromagnetic switching device 10 shown in FIG. 6A, the movable contact 4 is pressed toward the fixed contact 3a by the spring force of the contact pressure spring 6, and the pair of fixed contacts 3a, 3a and the fixed contact 3a It is possible to suppress the vibration of the movable contact 4 in a state in which the movable contact 4a is brought into contact with each.

  Further, in the electromagnetic switching device 10 shown in FIG. 6B, the protruding portion 8 a that protrudes in the thickness direction of the movable contact 4 (downward in FIG. 6B) at the peripheral portion of the insertion hole 4 c of the movable contact 4. The shaft portion 5a of the movable shaft 5 and the tapered different-diameter portion 8b whose shaft diameter is gradually increased from the end side of the movable shaft 5 in the thickness direction of the movable contact 4 constitute the vibration suppressing portion 8. ing. A screw portion 5c is projected from the end of the movable shaft 5 along the axial direction. The movable shaft 5 sandwiches the movable contact 4 between the end of the movable shaft 5 and the washer 9a. The screw portion 5c of the movable shaft 5 is fixed by a nut 9b. Such a vibration suppression unit 8 of the electromagnetic switching device 10 has the movable contact 4 pressed against the fixed contact 3a side by the spring force of the contact pressure spring 6, and each of the pair of fixed contacts 3a, 3a and the fixed contact 3a has a movable contact. It is possible to suppress the vibration of the movable contact 4 in a state where the contact 4a is in contact.

DESCRIPTION OF SYMBOLS 1 Contact device 2 Electromagnet device 3a Fixed contact 4 Movable contact 4a Movable contact 4c Insertion hole 5 Movable shaft 5a Shaft part 8 Vibration suppression part 8a Protrusion part 10 Electromagnetic switching device

Claims (3)

  A contact having a pair of fixed contacts, a movable contact that is provided on one surface of each of the fixed contacts, and a movable shaft that is inserted through the insertion hole of the movable contact and holds the movable contact. An apparatus, an electromagnet device connected to the movable shaft and moving the movable contact to contact and separate the fixed contact and the movable contact, and a shaft portion of the movable shaft and the movable contact An electromagnetic switching device comprising a vibration suppressing unit that suppresses vibration of the movable contact.   2. The electromagnetic switching device according to claim 1, wherein the vibration suppression unit is a protruding portion that protrudes in a thickness direction of the movable contact at a peripheral portion of the insertion hole. The electromagnetic switching device according to claim 1, wherein the vibration suppression unit is the shaft portion whose shaft diameter is changed in the thickness direction of the movable contact.

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