JP2007287525A - Electromagnetic switching device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic switching device capable of reducing impact propagated from a fixed iron core to a cap through a buffer member when a movable iron core collides with the fixed iron core. <P>SOLUTION: An electromagnet device 1 has a yoke 5 for supporting the fixed iron core 6. The fixed iron core 6 is constituted such that one end on the opposite side to the movable iron core 7 in the moving direction of the movable iron core 7 penetrates the yoke 5 and that a collar part 32 projected from the whole periphery of the peripheral surface is formed at a portion, projected from the yoke 5, of the one end. The yoke 5 is mounted with a cap 28 with the collar part 32 arranged between itself and the yoke 5, and a rubber sheet 33 formed of material with rubber elasticity is provided between the cap 28 and the collar part 32. The cap 28 has a support protrusion 37 protruded from a surface which faces the rubber sheet 33 in the moving direction of the movable iron core 7 so that the tip part comes in contact with a part of the rubber sheet 33. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electromagnetic switching device including an electromagnet device having a winding for excitation and a contact device that opens and closes in conjunction with the operation of the electromagnet device.

  Conventionally, as an electromagnetic switching device of this type, a fixed iron in which an electromagnet device 1 is disposed so as to face each other as shown in FIG. 14 in a part of a magnetic path through which a magnetic flux generated by an excitation winding 3 passes. There is provided a core having a core 6 and a movable iron core 7 movable between a position in contact with the fixed iron core 6 and a position away from the fixed iron core 6. In this electromagnet device 1, the movable iron core 7 contacts and separates from the fixed iron core 6 by turning on and off the energization winding 3. Here, the movable contact 25 provided with a pair of movable contacts 39 is provided on the movable iron core 7 so that the contact device 2 is opened and closed in conjunction with the movement of the movable iron core 7. Connected through.

  A fixed contact 23 is arranged opposite to each movable contact 39. When the movable iron core 7 is in contact with the fixed iron core 6, the contact device 2 composed of the movable contact 39 and the fixed contact 23 is closed. On the other hand, when the movable iron core 7 is separated from the fixed iron core 6 by the spring force of the return spring 13 provided between the fixed iron core 6 and the movable iron core 7, the contact device 2 is opened. . 14 is a so-called sealed contact device in which the contact device 2, the fixed iron core 6, and the movable iron core 7 are accommodated in an airtight space (see, for example, Patent Document 1).

In this type of electromagnetic switchgear, the movable iron core 7 collides with the fixed iron core 6 when the movable iron core 7 located at a position away from the fixed iron core 6 is brought into contact with the fixed iron core 6. An impact is applied to the core 6. When this impact is propagated to the yoke 5 that supports the fixed iron core 6, the yoke 5 vibrates, and may cause, for example, noise due to contact between the yoke 5 and other members. Therefore, instead of directly fixing the fixed iron core 6 to the yoke 5, as shown in FIG. 15, the flange 32 protrudes from the peripheral surface of the end of the fixed iron core 6 opposite to the movable iron core 7. The flange 32 is disposed between the cap 28 and the yoke 5 that are installed on the opposite side of the movable iron core 7 with respect to the yoke 5, and between the cap 28 and the fixed iron core 6 and the joint. By adopting a configuration in which rubber sheets 33 and 34 (buffer members) made of a material having rubber elasticity are provided between the iron 5 and the flange portion 32, the movable iron core 7 can collide with the fixed iron core 6. It has been proposed to prevent the impact from propagating directly from the fixed iron core 6 to the yoke 5.
JP-A-11-232986 (page 3-4, FIG. 1)

  By the way, in the above-described configuration, when the movable iron core 7 collides with the fixed iron core 6, the fixed iron core 6 is pushed by the movable iron core 7 and displaced upward in FIG. The rubber sheet 33 provided therebetween is pressed against the cap 28. However, since the entire surface of the rubber sheet 33 facing the cap 28 is in contact with the cap 28, the reaction force acting on the rubber sheet 33 from the cap 28 is dispersed on the entire surface of the rubber sheet 33. The pressure applied to each part of the sheet 33 is small and the rubber sheet 33 hardly deforms. As a result, an impact when the movable iron core 7 collides with the fixed iron core 6 is propagated to the cap 28 with almost no absorption by the rubber sheet 33 and may be further propagated from the cap 28 to the yoke 5. There is.

  The present invention has been made in view of the above-described reason, and can reduce the impact transmitted from the fixed iron core to the cap via the buffer member when the movable iron core collides with the fixed iron core. An object is to provide a switchgear.

  According to the first aspect of the present invention, there is provided an exciting winding, and a fixed iron core and a movable iron core that are arranged in one direction so as to face each other and form a magnetic path through which magnetic flux generated by the exciting winding passes. An electromagnet device that moves between a position where the movable iron core contacts the fixed iron core and a position away from the fixed iron core when the energization to the exciting winding is turned on and off, and the movable iron A contact device having a contact that opens and closes in conjunction with the movement of the core, and the electromagnet device has a yoke that supports the fixed iron core and forms a magnetic path together with the fixed iron core and the movable iron core. As for the iron core, one end portion on the opposite side to the movable iron core in the one direction passes through the yoke, and a flange portion protruding from the entire circumference of the peripheral surface is formed in a portion protruding from the yoke of the one end portion. The cap is placed on the yoke, and the cap is placed between it and the yoke. In addition, a cushioning member made of a material having rubber elasticity is provided between the cap and the collar, and the cap projects from a surface facing the cushioning member in the one direction and contacts a part of the cushioning member. It is characterized by having.

  According to this configuration, when the movable iron core contacts the fixed iron core, the fixed iron core is pressed against the movable iron core and displaced toward the cap along the one direction, and the rubber sheet is pressed against the cap. However, since the cap has a support protrusion that protrudes from the surface facing the buffer member in the one direction and contacts a part of the buffer member, the reaction force acting on the buffer member from the cap contacts the support protrusion on the buffer member. Therefore, the pressure applied to the portion of the cushioning member that is in contact with the cap increases. As a result, the amount of deformation of the buffer member increases, and the shock when the movable iron core comes into contact with the fixed iron core is absorbed by the buffer member. Therefore, the impact transmitted from the fixed iron core to the cap via the buffer member is Reduce.

  According to a second aspect of the present invention, in the first aspect of the present invention, the support protrusion is formed in a part of a circumferential direction of an annular ring centering on a central axis of the fixed iron core along the one direction. Features.

  According to this configuration, since the support protrusion is formed in a part of the circumferential direction of the ring centering on the central axis of the fixed iron core along the one direction, the support protrusion is formed on the entire circumference of the ring. Compared with the case where it is made, the contact area with the support protrusion in a buffer member can be made small. Therefore, the pressure applied to the portion of the buffer member that is in contact with the cap can be increased, and the impact transmitted from the fixed iron core to the cap when the movable iron core contacts the fixed iron core can be further reduced.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the cap is formed of a metal plate, and the support protrusion has a part of the cap having flexibility in the one direction. It is characterized by being cut and raised on the buffer member side.

  According to this configuration, the support protrusion is formed by cutting and raising the cap part so as to be flexible in the one direction, so that the movable iron core contacts the fixed iron core. When the fixed iron core is displaced to the cap side, the shock absorbing member is not only deformed and absorbs the shock, but also the shock is absorbed by the support protrusion being bent. Therefore, it is possible to further reduce the impact transmitted from the fixed iron core to the cap when the movable iron core contacts the fixed iron core.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the support protrusion has a contact portion that abuts against the buffer member projecting toward the buffer member along the one direction.

  According to this configuration, since the contact portion of the support protrusion protrudes toward the buffer member along the one direction, only the tip edge of the contact portion contacts the buffer member. The contact area with the protrusion can be kept small. Therefore, the pressure applied to the portion of the buffer member that is in contact with the cap can be increased, and the impact transmitted from the fixed iron core to the cap when the movable iron core contacts the fixed iron core can be further reduced.

  The invention of claim 5 is characterized in that, in the invention of claim 1, the support projection is formed in an annular shape centering on a central axis of the fixed iron core along the one direction.

  According to this configuration, since the support protrusion is formed in an annular shape centering on the central axis of the fixed iron core along the one direction, the fixed iron core is displaced to the cap side and presses the buffer member against the cap. Sometimes, the reaction force that acts on the buffer member from the cap is uniformly distributed in the circumferential direction of the ring around the central axis of the fixed iron core. Therefore, the impact propagated from the fixed iron core to the cap via the buffer member can be reduced uniformly over the entire circumference of the ring centering on the central axis of the fixed iron core.

  According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the support protrusion is formed in a curved shape in which a surface of a contact portion that is abutted against the buffer member is convex toward the buffer member side. It is characterized by.

  According to this configuration, since the surface of the contact portion of the support protrusion is formed in a curved surface that protrudes toward the buffer member, the support protrusion in the buffer member and the contact portion of the support protrusion The contact area can be reduced. Therefore, the pressure applied to the portion of the buffer member that is in contact with the cap can be increased, and the impact transmitted from the fixed iron core to the cap when the movable iron core contacts the fixed iron core can be further reduced.

  According to a seventh aspect of the present invention, in the invention according to any one of the first to fifth aspects, the support protrusion has a tapered portion in which a cross-sectional area of the contact portion abutted against the buffer member becomes smaller toward the buffer member side in the one direction. It is formed in a shape.

  According to this configuration, since the contact portion of the support protrusion is formed in a tapered shape, the contact area of the buffer member with the support protrusion can be reduced as compared with the case where the contact portion of the support protrusion is flat. . Therefore, the pressure applied to the portion of the buffer member that is in contact with the cap can be increased, and the impact transmitted from the fixed iron core to the cap when the movable iron core contacts the fixed iron core can be further reduced.

  In the present invention, when the movable iron core comes into contact with the fixed iron core, the fixed iron core is pressed against the movable iron core and displaced toward the cap along the one direction, and the rubber sheet is pressed against the cap. Since the cap has a support protrusion that protrudes from the surface facing the buffer member in the one direction and contacts a part of the buffer member, the reaction force acting on the buffer member from the cap Therefore, the pressure applied to the portion of the cushioning member that is in contact with the cap increases. As a result, the amount of deformation of the buffer member increases, and the shock when the movable iron core comes into contact with the fixed iron core is absorbed by the buffer member. Therefore, the impact transmitted from the fixed iron core to the cap via the buffer member is There is an advantage of reducing.

  In the following embodiments, a sealed contact device in which a contact device, a fixed iron core, and a movable iron core are housed in an airtight space in the same manner as described as a conventional configuration will be described as an example of an electromagnetic switching device. Therefore, the contact device, the fixed iron core, and the movable iron core need not be sealed.

(Embodiment 1)
As shown in FIG. 1, the electromagnetic switching device of the present embodiment includes an electromagnet device 1 having an exciting winding 3 and a contact device 2 as in the conventional configuration. In the following, the configuration of each part will be described in more detail than the conventional configuration with the vertical and horizontal directions in FIG.

  The electromagnet device 1 includes a fixed member provided with the exciting winding 3 and a movable member disposed so as to face the fixed member. In addition to the exciting winding 3, the fixing member is made of a synthetic resin and has a cylindrical coil bobbin 4 around which the exciting winding 3 is wound, and a yoke 5 made of a magnetic metal material and surrounding the coil bobbin 4. And a fixed iron core 6 disposed inside the coil bobbin 4. The movable member includes a movable iron core 7 that is arranged alongside the fixed iron core 6 in the vertical direction that is the axial direction of the coil bobbin 4 inside the coil bobbin 4. The fixed iron core 6 and the movable iron core 7 together with the yoke 5 form a magnetic path through which the magnetic flux generated by the exciting winding 3 passes. The coil bobbin 4 has a pair of flanges 8 facing in the vertical direction on both the upper and lower sides of the excitation winding 3.

  The yoke 5 of this embodiment includes a rectangular plate-like yoke upper plate 9 that abuts on the upper end surface of the coil bobbin 4 and a rectangular plate-like yoke lower plate 10 that abuts on the lower end surface of the coil bobbin 4. And a pair of yoke side plates 11 that connect the left and right edges of the yoke upper plate 9 and the yoke lower plate 10, respectively, and open in the front-rear direction (the direction perpendicular to the paper surface in FIG. 1). Has been. The yoke lower plate 10 and the pair of yoke side plates 11 are integrally formed by bending one plate.

  Between the fixed iron core 6 and the movable iron core 7 and the coil bobbin 4, a plunger cap 12 made of a nonmagnetic material and formed in a bottomed cylindrical shape with an upper surface opening is interposed. In other words, the fixed iron core 6 and the movable iron core 7 are accommodated in the plunger cap 12 provided inside the coil bobbin 4. The fixed iron core 6 is disposed on the opening side of the plunger cap 12. Furthermore, the fixed iron core 6 and the movable iron core 7 are each formed in a cylindrical shape whose outer diameter is approximately the same as the inner diameter of the plunger cap 12, and the movable iron core 7 is movable in the axial direction of the plunger cap 12. Yes. The moving range of the movable iron core 7 is set between an initial position away from the fixed iron core 6 and a contact position where the movable iron core 7 contacts the fixed iron core 6. Between the fixed iron core 6 and the movable iron core 7, a return spring 13 made of a coil spring and having a spring force for returning the movable iron core 7 to the initial position is interposed.

  Further, an insertion hole 14 through which the fixed iron core 6 is inserted is provided in the central portion of the yoke upper plate 9, and the fixed iron core 6 is inserted into the insertion hole 14 in the yoke upper plate 9. Fixed. The structure for fixing the fixed iron core 6 to the yoke upper plate 9 will be described in detail later. Further, the plunger cap 12 has an opening peripheral portion fixed to the periphery of the insertion hole 14 in the lower surface of the yoke upper plate 9 and a lower end portion in a holding hole 15 provided in the central portion of the yoke lower plate 10. It is inserted. Here, the movable iron core 7 housed in the lower portion of the plunger cap 12 is magnetically coupled to the peripheral portion of the holding hole 15 in the yoke lower plate 10.

  According to the configuration described above, when the excitation winding 3 is energized, the opposed surface of the fixed iron core 6 to the movable iron core 7 and the peripheral portion of the holding hole 15 in the yoke lower plate 10 are a pair of magnetic pole portions. Will be magnetized with different polarities. Therefore, when the exciting winding 3 is energized, the movable iron core 7 and the fixed iron core 6 magnetically coupled to the periphery of the holding hole 15 in the yoke lower plate 10 have different polarities, and the movable iron core 7 is It is attracted to the fixed iron core 6 and moves to the contact position. On the other hand, when the energization of the exciting winding 3 is stopped, the movable iron core 7 returns to the initial position by the return spring 13. A part of the return spring 13 is housed in a spring housing recess 16 provided in the fixed iron core 6, and when the movable iron core 7 moves to the contact position, the return spring 13 is compressed and the entire return spring 13 is housed in the spring. The return spring 13 does not prevent the movable iron core 7 from coming into contact with the fixed iron core 6 because it fits in the recess 16. Furthermore, in the present embodiment, a lower damper rubber 17 formed in a plate shape from a rubber elastic material and having a dowel 18 projecting on one surface of the movable iron core 7 is provided at the bottom of the plunger cap 12. The lower damper rubber 17 absorbs the impact transmitted from the movable iron core 7 to the bottom surface of the plunger cap 12 when returning to the initial position. A movable side rubber 19 formed in a plate shape from a material having rubber elasticity is provided on the upper surface of the movable iron core 7 so that the movable iron core 7 is moved from the movable iron core 7 to the fixed iron core 6 when moving to the contact position. The transmitted impact is alleviated by the movable rubber 19.

  In addition, above the electromagnet device 1, a base block 20 formed in a box shape whose lower surface is opened by a heat-resistant material is provided, and terminal holes 21 are provided at two locations at the bottom of the base block 20. Each terminal hole 21 is inserted with a fixed terminal block 22 formed from a copper-based material in a columnar shape. A fixed contact 23 is fixed to the lower end surface of each fixed terminal block 22. A casing 24 is provided at the upper end of each fixed terminal block 22 so as to protrude from the entire circumference of the peripheral surface, and the casing 24 is brazed to the base block 20.

  In the base block 20, a flat plate-shaped movable contact 25 made of a conductive material is provided so as to straddle between the two fixed contacts 23, and each portion facing the fixed contact 23 on the upper surface of the movable contact 25 is provided at each portion. A movable contact (not shown) that constitutes the contact device 2 together with the fixed contact 23 is provided. A shaft hole 27 through which one end of a shaft 26 that connects the movable contact 25 to the movable iron core 7 is inserted is provided at the center of the movable contact 25.

  The shaft 26 is formed in a round bar shape, and is prevented from coming off from the movable contact 25 by a portion protruding upward from the movable contact 25. Furthermore, a coiled spring having a shaft 26 inserted between a disc-shaped cap 28 made of a metal plate attached to the upper surface side of the yoke upper plate 9 so as to cover the insertion hole 14 and the movable contact 25 is formed. A contact pressure spring 29 is provided, and the movable contact 25 is pressed upward by the spring force of the contact pressure spring 29, so that it is held at the upper end of the shaft 26. Further, the lower end portion of the shaft 26 is inserted into the fixed iron core 6 through the through hole 30 penetrating through the center portion of the cap 28 and coupled to the movable iron core 7. With this configuration, the movable contact 25 moves in the vertical direction in conjunction with the movement of the movable iron core 7. The cap 28 will be described in detail later.

  Here, when the movable iron core 7 is in the initial position, the movable contact and the fixed contact 23 are separated from each other (that is, the contact device 2 is opened), while when the movable iron core 7 is in the contact position, the movable contact and the fixed contact 23 are fixed. The positional relationship between the movable iron core 7 and the movable contact 25 is set so that the contact 23 comes into contact (that is, the contact device 2 is closed). In short, when the excitation winding 3 is not energized, the contact device 2 is opened to insulate the fixed terminal blocks 22 from each other, and during the period when the excitation winding 3 is energized, the contact device 2. Is closed, the two fixed terminal blocks 22 are electrically connected. The contact pressure between the movable contact and the fixed contact 23 is ensured by the contact pressure spring 29.

  Further, a cylindrical connecting body 31 is provided so as to cover the gap between the base block 20 and the yoke upper plate 9 so that the contact device 2, the fixed iron core 6 and the movable iron core 7 are accommodated in the airtight space, and The base block 20, the fixed terminal block 22, the yoke upper plate 9, the plunger cap 12, and the coupling body 31 are hermetically joined to connect the base block 20, the fixed terminal block 22, the yoke upper plate 9, and the plunger cap 12. The space surrounded by the body 31 is an airtight space.

  Hereinafter, a structure for fixing the fixed iron core 6 to the yoke upper plate 9 will be described. The fixed iron core 6 is inserted into the insertion hole 14 so that the upper end portion protrudes upward from the upper surface of the yoke upper plate 9. At the upper end portion of the fixed iron core 6, the flange portion 32 is formed so as to protrude laterally from the entire circumference of the peripheral surface, and the flange portion 32 is caught around the insertion hole 14 in the yoke upper plate 9. Thus, the fixed iron core 6 is prevented from coming down downward with respect to the yoke upper plate 9. Furthermore, on the upper surface side of the yoke upper plate 9, the above-described cap 28 is attached to the yoke 5 by fixing the peripheral portion of the lower surface to the yoke upper plate 9. The lower surface of the cap 28 is recessed in accordance with the shape of the upper end portion of the fixed iron core 6 so as to form a space for accommodating the upper end portion of the fixed iron core 6 between the cap upper plate 9 and the joint 28. The fixed iron core 6 is supported by the yoke 5 by disposing the flange portion 32 of the fixed iron core 6 between the upper surface of the iron upper plate 9 and the periphery of the insertion hole 14. The through hole 30 of the cap 28 through which the shaft 26 is inserted is formed in a circular shape centering on the central axis along the vertical direction of the fixed iron core 6. Note that the front and rear ends of the cap 28 are cut out in accordance with the shape of the yoke upper plate 9.

  Here, between the lower surface of the cap 28 and the upper surface of the fixed iron core 6 and the lower surface of the flange 32 and the yoke so that vibration from the fixed iron core 6 is not directly propagated to the cap 28 and the yoke upper plate 9. Between the upper surface of the upper plate 9, rubber sheets 33 and 34 (buffer members) made of a material having rubber elasticity (here, synthetic rubber) are provided. Both rubber sheets 33 and 34 are formed in a disk shape, and a through hole 35 (see FIG. 2) through which the shaft 26 is inserted penetrates the central portion of the rubber sheet 33 on the cap 28 side. A through hole 36 (see FIG. 2) through which the fixed iron core 6 is inserted is provided in the center of the rubber sheet 34 on the plate 9 side.

  By the way, in the electromagnetic switching device of this embodiment, as shown in FIG. 3, the cap 28 protrudes from a part of the surface (lower surface) facing the rubber sheet 33 in the vertical direction, and the tip portion is a cap in the rubber sheet 33. And a support projection 37 to be brought into contact with a part of the surface (upper surface) facing the surface. With this configuration, the impact transmitted from the fixed iron core 6 to the cap 28 via the rubber sheet 33 when the movable iron core 7 collides with the fixed iron core 6 is reduced.

  That is, when energization of the exciting winding 3 is started, if the movable iron core 7 collides with the fixed iron core 6, the fixed iron core 6 is pushed by the movable iron core 7 so that the upper portion of FIG. The rubber sheet 33 is pressed against the cap 28. Here, according to the above-described configuration in which the support protrusion 37 is provided, the reaction force acting on the rubber sheet 33 from the cap 28 is concentrated on the portion of the rubber sheet 33 where the support protrusion 37 is in contact, which is a conventional configuration. Compared with the case where the reaction force acting on the rubber sheet 33 from the cap 28 is distributed over the entire surface of the rubber sheet 33 as described above, the pressure applied to the portion of the rubber sheet 33 where the support protrusions 37 are in contact increases. As a result, the amount of deformation in the thickness direction of the portion sandwiched between the support protrusion 37 and the fixed iron core 6 in the rubber sheet 33 increases, and the impact when the movable iron core 7 collides with the fixed iron core 6 is reduced. It is reduced by being absorbed at 33, and is not easily propagated to the cap 28. Therefore, this impact is also prevented from propagating to the yoke 5.

  Hereinafter, the shape of the support protrusion 37 will be described in detail. As shown in FIG. 4A, the support protrusion 37 of the present embodiment is formed in an annular shape centering on the center of the through hole 30 on the lower surface of the cap 28. That is, since the support protrusion 37 is formed in an annular shape centering on the central axis along the vertical direction of the fixed iron core 6, the fixed iron core 6 is displaced toward the cap 28 and presses the rubber sheet 33 against the cap 28. In this case, the reaction force acting on the rubber sheet 33 from the cap 28 is distributed without deviation with respect to the central axis of the fixed iron core 6. Therefore, the impact propagated from the fixed iron core 6 to the cap 28 via the rubber sheet 33 can be reduced uniformly over the entire circumference of the ring centering on the central axis of the fixed iron core 6.

  Moreover, the contact portion of the support protrusion 37 that is abutted against the rubber sheet 33 is a cross section orthogonal to the longitudinal direction of the support protrusion 37 (that is, the circumferential direction of the through hole 30), as shown in FIGS. Is formed in a semicircular shape. In this way, by forming the surface of the contact portion of the support protrusion 37 into a curved surface that protrudes toward the rubber sheet 33, the rubber sheet 33 in the support protrusion 37 can be compared with the case where the contact portion of the support protrusion 37 is flat. When the fixed iron core 6 is displaced to the cap 28 side, the pressure applied to the contact portion with the support protrusion 37 in the rubber sheet 33 increases, so that the deformation amount in the thickness direction of the rubber sheet 33 is reduced. When the movable iron core 7 becomes larger and collides with the fixed iron core 6, the impact transmitted from the fixed iron core 6 to the cap 28 can be further reduced by the rubber sheet 33.

  Further, as shown in FIG. 5 (a), even in the annular support projection 37 similar to the example shown in FIG. 4, the contact portion of the support projection 37 has a surface as shown in FIGS. 5 (b) and 5 (c). You may form in the taper shape made into the inclined surface 38 which inclines in the direction which leaves | separates the both ends side of the width direction. That is, the contact portion of the support protrusion 37 is formed so that the cross-sectional area becomes smaller toward the rubber sheet 33 in the vertical direction. In this configuration, the contact area of the support protrusion 37 with the rubber sheet 33 is further reduced, and the impact transmitted from the fixed iron core 6 to the cap 28 when the movable iron core 7 collides with the fixed iron core 6 is further reduced. be able to. Furthermore, as shown in FIG. 6 (a), even in the annular support projection 37 similar to the example shown in FIG. 5, the opening angle of the inclined surface 38 is contacted at the contact portion as shown in FIGS. By reducing the contact area of the support protrusion 37 with the rubber sheet 33, the impact transmitted from the fixed iron core 6 to the cap 28 when the movable iron core 7 collides with the fixed iron core 6 is further reduced. Further reduction may be possible.

(Embodiment 2)
The electromagnetic switch according to the present embodiment is different from the electromagnetic switch according to the first embodiment in the shape of the support protrusion 37. Other configurations and functions are the same as those of the first embodiment.

  As shown in FIG. 7A, the support protrusion 37 according to the present embodiment is formed on a part of the circumferential direction of the ring centering on the center of the through hole 30 on the lower surface of the cap 28. According to this configuration, the contact area between the rubber sheet 33 and the support protrusion 37 is reduced as compared with the case where the support protrusion 37 is provided over the entire circumference of the ring centering on the center of the through hole 30, and as a result In particular, when the fixed iron core 6 is displaced to the cap 28 side, the pressure applied to the contact portion of the rubber sheet 33 with the support protrusion 37 increases, so that the amount of deformation in the thickness direction of the rubber sheet 33 increases and is movable. When the iron core 7 collides with the fixed iron core 6, the impact transmitted from the fixed iron core 6 to the cap 28 can be reduced. Here, as shown in FIG. 7A, a plurality of (eight) support protrusions 37 are arranged at equal intervals surrounding the through hole 30 on the lower surface of the cap 28.

  Furthermore, the surface of the contact portion that is abutted against the rubber sheet 33 in each support protrusion 37 is formed in a shape that is a part of a spherical surface (so-called SR shape). In this way, by forming the surface of the contact portion of the support protrusion 37 into a curved surface that protrudes toward the rubber sheet 33, the rubber sheet 33 in the support protrusion 37 can be compared with the case where the contact portion of the support protrusion 37 is flat. The contact area is reduced, and the impact transmitted to the cap 28 when the movable iron core 7 collides with the fixed iron core 6 can be further reduced.

  As another configuration of the present embodiment, the contact area between the rubber sheet 33 and the support protrusion 37 is reduced by reducing the size of each support protrusion 37 on the lower surface of the cap 28 as shown in FIG. May be made smaller. Here, as shown in FIG. 8B, the size of the support protrusion 37 on the lower surface of the cap 28 is reduced by reducing the radius of the spherical surface constituting the surface of the contact portion of the support protrusion 37.

  As another configuration, the contact area between the rubber sheet 33 and the support protrusion 37 can be reduced by reducing the number of support protrusions 37 provided on the cap 28 as shown in FIGS. Good. Here, four support protrusions 37 are provided as shown in FIG. 9A, but the number is not limited to this. However, it is desirable that the plurality of support protrusions 37 be arranged at equal intervals so as to surround the through hole 30 on the lower surface of the cap 28.

  Furthermore, as shown in FIG. 10, the contact portion of each support protrusion 37 may have a tapered shape (so-called tapered shape) whose sectional area becomes smaller toward the rubber sheet 33 in the one direction. In this configuration, the contact area of the support protrusion 37 with the rubber sheet 33 can be reduced as compared with the case where the surface of the contact portion of the support protrusion 37 is formed in a curved surface. The impact transmitted from the fixed iron core 6 to the cap 28 when colliding with the cap 6 can be further reduced.

(Embodiment 3)
The electromagnetic switch according to the present embodiment is different from the electromagnetic switch according to the second embodiment in that each support protrusion 37 is formed by cutting and raising a part of the cap 28. Other configurations and functions are the same as those of the second embodiment.

  As shown in FIG. 11A, a plurality of (four) supporting protrusions 37 according to the present embodiment are provided at equal intervals so as to surround the through hole 30 on the lower surface of the cap 28 as in the example shown in FIG. ing. Each support protrusion 37 is formed by cutting and raising a rectangular portion of the cap 28 that is long in the radial direction of the through hole 30 toward the rubber sheet 33 so that the peripheral edge of the cap 28 is the tip. Here, each support protrusion 37 is cut and raised so as to be inclined with respect to the lower surface of the cap 28 so as to be flexible in the vertical direction. According to this configuration, when the movable iron core 7 collides with the fixed iron core 6 and the fixed iron core 6 is displaced to the cap 28 side, the rubber sheet 33 is deformed to absorb the impact, and the support protrusion 37 itself. When the movable iron core 7 collides with the fixed iron core 6, the impact propagated from the fixed iron core 6 to the cap 28 is affected by the rubber sheet 33 and the support protrusion 37. And both.

  Further, as another configuration of the present embodiment, the shape of the support protrusion 37 formed by cutting and raising a part of the cap 28 toward the rubber sheet 33 as shown in FIG. 12B is shown in FIG. Thus, it is good also as a tapering shape inclined so that both side surfaces may mutually approach the tip side. Thereby, the contact area of the support protrusion 37 with the rubber sheet 33 can be further reduced, and the impact transmitted from the fixed iron core 6 to the cap 28 when the movable iron core 7 collides with the fixed iron core 6 is further increased. Can be reduced.

  Furthermore, as the shape of the contact portion 37a that abuts against the rubber sheet 33 in the support protrusion 37, as shown in FIG. 13A, a direction (vertical direction) orthogonal to the surface of the rubber sheet 33 that faces the support protrusion 37. It may be bent to the rubber sheet 33 side so as to protrude along. In this configuration, the contact portion 37a of the support protrusion 37 is abutted with the rubber sheet 33 in the vertical direction, and the contact area of the support protrusion 37 with the rubber sheet 33 can be further reduced. Here, as shown in FIG. 13B, the surface of the contact portion 37a of the support protrusion 37 is formed in a curved surface that protrudes toward the rubber sheet 33 side, or the contact portion of the support protrusion 37 as shown in FIG. 13C. The contact area of the support protrusion 37 with the rubber sheet 33 may be further reduced by forming the tapered shape 37a such that the cross-sectional area decreases toward the rubber sheet 33 side.

It is sectional drawing which shows the structure of Embodiment 1 of this invention. It is a disassembled perspective view of the principal part same as the above. It is sectional drawing of the principal part same as the above. The cap used for the above is shown, (a) is a bottom view, (b) is a sectional view, and (c) is a sectional view of the main part. The other structure of the cap used for the above is shown, (a) is a bottom view, (b) is a sectional view, and (c) is a sectional view of the main part. The other structure of the cap used for the same as above is shown, (a) is a bottom view, (b) is a sectional view, and (c) is a sectional view of the main part. The cap used for Embodiment 2 of this invention is shown, (a) is a bottom view, (b) is sectional drawing. The other structure of the cap used for the same as above is shown, (a) is a bottom view, and (b) is a sectional view. The other structure of the cap used for the same as above is shown, (a) is a bottom view, and (b) is a sectional view. It is sectional drawing of the principal part which shows other structure of the cap used for the same as the above. The cap used for Embodiment 3 of this invention is shown, (a) is a bottom view, (b) is sectional drawing. The other structure of the cap used for the same as above is shown, (a) is a bottom view, and (b) is a sectional view. It is sectional drawing which shows the other structure of the support protrusion of the cap used for the same as the above. It is sectional drawing which shows a prior art example. It is sectional drawing of the principal part which shows another prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnet apparatus 2 Contact apparatus 3 Excitation coil | winding 5 Relay 6 Fixed iron core 7 Movable iron core 28 Cap 32 Eaves part 33 Rubber sheet (buffer member)
37 support protrusion 37a contact part

Claims (7)

  An excitation winding and a fixed iron core and a movable iron core that are arranged in one direction so as to face each other and form a magnetic path through which a magnetic flux generated by the excitation winding passes. When the energization is turned on and off, the electromagnet device moves between the position where the movable iron core contacts the fixed iron core and the position away from the fixed iron core along the one direction, and in conjunction with the movement of the movable iron core An electromagnet device having a yoke that supports a fixed iron core and forms a magnetic path with the fixed iron core and the movable iron core, and the fixed iron core is in one direction The end opposite to the movable iron core in the through hole penetrates the yoke, and the flange protruding from the entire circumference of the peripheral surface is formed on the portion protruding from the yoke at the one end. The cap is disposed between the yoke and the collar is disposed, and the cap and the collar A cushioning member made of a material having rubber elasticity is provided between the caps, and the cap has a support projection that projects from a surface facing the cushioning member in the one direction and contacts a part of the cushioning member. Electromagnetic switchgear.   The electromagnetic switch according to claim 1, wherein the support protrusion is formed on a part of a circumferential direction of an annulus centering on a central axis of the fixed iron core along the one direction.   2. The cap is formed of a metal plate, and the support protrusion is cut and raised to the buffer member side so that a part of the cap has flexibility in the one direction. Or the electromagnetic switching device of Claim 2.   The electromagnetic switch according to claim 3, wherein the support protrusion has a contact portion that abuts against the buffer member projecting toward the buffer member along the one direction.   The electromagnetic switch according to claim 1, wherein the support protrusion is formed in an annular shape centering on a central axis of the fixed iron core along the one direction.   The said support protrusion is formed in the curved surface shape from which the surface of the contact part butt | matched by the said buffer member becomes convex on the buffer member side, The Claim 1 thru | or 5 characterized by the above-mentioned. Electromagnetic switchgear.   6. The support projection according to claim 1, wherein a contact portion that is abutted against the buffer member is formed in a tapered shape having a cross-sectional area that decreases in the direction toward the buffer member in the one direction. The electromagnetic switchgear according to item 1.

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