JP2012199088A - Contact device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact device that reduces collision noise between a movable member and a fixed member when movable contacts come into contact with fixed contacts.SOLUTION: Upon energization of a coil 13, a movable iron core 17 is moved in a direction toward a fixed iron core 15, and movable contacts 31 provided in a movable contactor 29 that is moved integrally with the movable iron core 17 are brought into contact with fixed contacts 35. A shock-absorbing sheet 22 is arranged in a flat portion 15b1 of a depression 15b, of the fixed iron core 15, which faces the movable iron core 17. The shock-absorbing sheet 22 absorbs shock of contact between the fixed iron core 15 and the movable iron core 17 when the movable iron core 17 is moved in a direction toward the fixed iron core 15.

Description

  The present invention relates to a contact device in which a movable contact moves toward and comes into contact with a fixed contact and is electrically connected.

  As a contact device, what is applied to the electromagnetic relay described in the following patent document 1, for example is known. In this electromagnetic relay contact device, a movable core made of a magnetic metal material fixed to a shaft moves by energizing a coil, and a movable contact provided on one end side of the shaft is fixed to a fixed contact holding member. It is made to contact the fixed contact.

  The movable core is pressed in a direction in which the movable contact is separated from the fixed contact by the return spring, and moves against the return spring by energization. A fixed core made of a magnetic metal material is disposed in front of the movable core in the moving direction, and is attracted to the fixed core when the movable core moves by energization.

JP 2010-257923 A

  As described above, in the contact device of the electromagnetic relay, the movable contact is brought into contact with the fixed contact by the movable core being attracted and moved by the energization of the coil. At that time, the movable core is adsorbed to the fixed core, and at the time of adsorption, the cores collide with each other to generate a collision sound and generate an external noise. The generation of such abnormal noise is related to the reliability of the product, and improvement is desired.

  Then, this invention aims at suppressing the collision sound of a movable member and a fixed member when making a movable contact contact a fixed contact.

  In order to achieve the above object, the first invention includes a fixed member that is magnetized by energizing the coil, a movable member that moves so as to be attracted to the fixed member by energizing the coil, and the movable member A movable contact provided on the member, and a fixed contact that contacts when the movable contact moves as the movable member moves, and the movable contact moves while moving toward the fixed member. An impact absorbing member is provided between the fixed member and the movable member so that the movable member contacts and absorbs an impact when contacting the fixed contact.

  According to a second invention, in the configuration of the first invention, the shock absorbing member is made of a magnetic material.

  According to a third invention, in the configuration of the first or second invention, the fixed member is supported by a yoke disposed on the side opposite to the movable member via an elastic member.

  According to a fourth aspect of the present invention, in the configuration of the first or second aspect of the invention, the fixed member is supported by a case located on the opposite side of the movable member via an elastic member.

  According to a fifth invention, in the configuration of the fourth invention, an elastic body is provided between a yoke disposed inside the case and a fixing member located on the case side with respect to the yoke. .

  According to the first aspect of the present invention, when the movable contact is brought into contact with the fixed contact, the movable member moves toward the fixed member and collides with the shock absorbing member to absorb the impact. It is possible to suppress the collision noise between the two.

  According to the second aspect of the present invention, the magnetic loss can be reduced as compared with the case where the shock absorbing member is made of a nonmagnetic material.

  According to the invention of claim 3 or 4, when the movable member moves toward the fixed member and collides with the shock absorbing member to absorb the shock, the elastic member also absorbs the shock and the movable member and the fixed member Can be further suppressed. According to the invention of claim 3, when the elastic member absorbs an impact, vibration transmitted from the fixing member to the yoke can be suppressed.

  According to the invention of claim 5, after the elastic member absorbs the impact and the fixing member moves in a direction away from the yoke, the elastic member is restored, and the elastic member is elastic when the fixing member moves toward the yoke. The body can be elastically deformed between the fixing member and the yoke to absorb the impact, and the vibration transmitted from the fixing member to the yoke can be suppressed.

It is sectional drawing of the electromagnetic relay provided with the contact apparatus concerning the 1st Embodiment of this invention. FIG. 2 is an operation explanatory diagram of the electromagnetic relay of FIG. 1, (a) shows a state in which the movable iron core is separated from the fixed iron core with the contact device turned off, and (b) shows the movable iron core with the contact device turned on. The state approaching the fixed iron core is shown. It is operation | movement explanatory drawing corresponding to Fig.2 (a) which shows 2nd Embodiment. It is operation | movement explanatory drawing corresponding to Fig.2 (a) which shows 3rd Embodiment. It is sectional drawing of the electromagnetic relay corresponding to FIG. 1 which shows 5th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
The contact device according to the first embodiment is applied to the electromagnetic relay shown in FIG. This electromagnetic relay includes a drive unit 1 located at the lower part in FIG. 1 and a contact part 3 located at the upper part. The drive part 1 and the contact part 3 are accommodated in a case 5. The case 5 includes a case body 7 that opens on the contact portion 3 side, and a cover 9 that closes the opening side of the case body 7.

  In addition, although the case 5 here is circular in a plan view viewed from the up-down direction in FIG. 1, it may be square or polygonal.

  The case body 7 includes a lower wall 7a and a peripheral wall 7b that rises from the periphery of the lower wall 7a toward the contact portion 3 side, and has a deep cup shape that opens on the contact portion 3 side. On the other hand, the cover 9 includes an upper wall 9a and a peripheral wall 9b extending from the periphery of the upper wall 9a toward the drive unit 1 and has a shallow cup shape that opens on the drive unit 1 side.

  The drive unit 1 includes a coil 13 wound around a coil bobbin 11, and a fixed iron core 15 as a fixing member is disposed on the lower wall 7 a side of the case body 7 in a through hole 11 a formed at the center of the coil bobbin 11. A movable iron core 17 which is a movable member is arranged on the opening side opposite to the lower wall 7a.

  A yoke 19 is disposed between the coil 13 and the case body 7. The yoke 19 includes a bottom wall 19a that faces the lower wall 7a, and a cylindrical portion 19b that is formed so as to surround the periphery of the rising coil 13 from the periphery of the bottom wall 9a and that faces the peripheral wall 7b.

  Further, the yoke upper plate 21 is arranged so as to cover a portion corresponding to the coil 13 of the opening on the contact portion 3 side of the yoke 19 described above. The yoke upper plate 21 has an outer peripheral edge portion fixed to an end portion of the cylindrical portion 19 b of the yoke 19, and a cylindrical portion 21 a that protrudes downward from the inner peripheral edge portion is inserted between the movable iron core 17 and the coil bobbin 11. It is arranged. For this reason, in the coil bobbin 11, a part of the contact portion 3 side into which the cylindrical portion 21a of the yoke upper plate 21 is inserted has an inner diameter of the through hole 11a larger than that of the other portion below.

  The peripheral wall 7 b of the case main body 7 reaches the position where the upper end covers the contact portion 3, and the cylindrical inner case 20 is disposed inside the position covering the contact portion 3. The inner case 20 is sandwiched and fixed between a cover 9 thicker than the case body 7 and the yoke upper plate 21.

  The fixed iron core 15 is fixed to the yoke 19 by fitting the projection 15a into a fitting hole 19a1 formed at the center of the bottom wall 19a of the yoke 19. On the other hand, the movable iron core 17 located on the contact portion 3 side of the fixed iron core 15 can move toward and away from the fixed iron core 15 in the through hole 11 a of the coil bobbin 11.

  A concave portion 15b is formed on the surface of the fixed iron core 15 that faces the movable core 17, while a convex portion 17a that matches the concave portion 15b is formed on the surface of the movable iron core 17 that faces the fixed iron core 15. The concave portion 15b of the fixed iron core 15 has a flat surface portion 15b1 located at the center, and an annular inclined surface 15b2 that is inclined so as to protrude from the periphery of the flat surface portion 15b1 toward the movable iron core 17 side. On the other hand, the convex portion 17a of the movable iron core 17 has a spring accommodating recess 17a1 formed at a position facing the flat portion 15b1, and an inclined surface 17a2 that inclines away from the peripheral edge of the spring accommodating recess 17a1 with respect to the fixed core 15. And have. The inclined surface 15b2 of the fixed iron core 15 and the inclined surface 17a2 of the movable iron core 17 are substantially parallel to each other.

  An impact absorbing sheet 22 as an impact absorbing member is disposed on the flat portion 15b1 of the recess 15b in the fixed iron core 15, and a return spring 23 is provided between the impact absorbing sheet 22 and the spring accommodating recess 17a1 of the movable iron core 17. It is arranged. The return spring 23 presses the movable iron core 17 in a direction away from the fixed iron core 15.

  A shaft 25 is provided on the opposite side of the movable iron core 17 to the fixed iron core 15 so as to extend along the moving direction of the movable iron core 17. The shaft 25 may be integrated with the movable iron core 17 or may be fixed to the movable iron core 17 as a separate body.

  A movable contact 29 is attached to the tip of the shaft 25 through a boss portion 27. The movable contact 29 is formed in a plate shape that is long in the left-right direction in FIG. 1, and a pair of substantially hemispherical movable contacts 31 are provided on the lower surfaces of the drive unit 1 side at both ends in the longitudinal direction.

  Between the movable contact 29 and the upper wall 9a of the cover 9, a contact pressure spring 33 that presses the movable contact 29 against the drive unit 1 is disposed. This contact pressure spring 33 has a spring coefficient set lower than that of the return spring 23 described above. For this reason, in a state where the coil 13 is not energized and no driving force is applied to the movable iron core 17, the elastic force of the return spring 23 overcomes the elastic force of the contact pressure spring 33, and the movable iron core 17 is moved to the movable contact 29. At the same time, it moves in a direction away from the fixed iron core 15 to the state shown in FIG.

  A fixed contact 35 is disposed at a position facing the drive unit 1 side of the movable contact 31. The fixed contact 35 is fixed on a fixed terminal 37, and the fixed terminal 37 is attached to a fixed contact holding portion 41 made of an insulating member.

  The fixed contact holding portion 41 has an outer peripheral surface 41 b fixed to the inner surface of the inner case 20 with the bottom surface 41 a facing the yoke upper plate 21. The fixed contact holding portion 41 may be formed in an annular shape so as to surround the periphery of the shaft 25, but is provided only in the vicinity of the position where the fixed terminal 37 exists on both sides in the left-right direction in FIG. It is good also as a separate body by right and left. And the notch recessed part 41c is formed in the shaft 25 side of this fixed contact holding | maintenance part 41, and the fixed terminal 37 is attached to the notch recessed part 41c.

  The fixed terminal 37 is integrally formed with the resin fixed contact holding portion 41, for example, and is not shown in the figure, but is used as an external connection terminal that draws its end portion outside the case 5 and connects it to an external load or the like.

  Next, the operation of the electromagnetic relay will be described. In the state of FIG. 1 in which the coil 13 is not energized, the elastic force of the return spring 23 overcomes the elastic force of the contact pressure spring 33, the movable iron core 17 moves away from the fixed iron core 15, and the movable contact 31 is fixed. The state shown in FIG. 1 is separated from the contact 35, and the contact device is turned off.

  When the coil 13 is energized from this off state, the movable iron core 17 moves closer to the fixed iron core 15 by being attracted to the fixed iron core 15 against the elastic force of the return spring 23 by electromagnetic force. As a result, the movable contact 31 comes into contact with the fixed contact 35 and these contacts are electrically connected to each other, and the contact device is turned on.

  At this time, in this embodiment, when the movable iron core 17 is attracted to and moved by the fixed iron core 15, the tip of the inclined surface 17a2 comes into contact with the shock absorbing sheet 22, as shown in FIG. The impact noise at the time of contact can be suppressed by the impact absorbing sheet 22. Thereby, generation | occurrence | production of the abnormal noise to the outside can be suppressed and the reliability of a product can be improved.

  That is, in this embodiment, when the movable iron core 17 moves toward the fixed iron core 15 and the movable contact 31 comes into contact with the fixed contact 35, the shock absorbing sheet 22 is provided so that the movable iron core 17 contacts and absorbs the shock. That's right.

  In the ON state of the contact device, the contact pressure spring 33 presses the movable contact 29, so that the contact pressure between the movable contact 31 and the fixed contact 35 is maintained, and the conduction state becomes more reliable.

  The impact absorbing sheet 22 described above may be provided on the movable iron core 17 side. The shock absorbing sheet provided on the movable iron core 17 side has an annular shape that is fixed to the tip of the inclined surface 17a2 at the periphery of the spring accommodating recess 17a1 and surrounds the return spring 23. Further, a conical shock absorbing sheet may be provided between the inclined surface 15 b 2 of the fixed iron core 15 and the inclined surface 17 a 2 of the movable iron core 17. Further, the shock absorbing sheet 22 may be attached to the fixed iron core 15 by forming a recess in the flat portion 15b1 and partially embedding the recess.

[Second Embodiment]
In the second embodiment, the shock absorbing sheet 22 in the first embodiment is made of a magnetic material. Other configurations are the same as those of the first embodiment. By configuring the shock absorbing sheet 22 with a magnetic material, magnetic loss can be reduced compared to when the shock absorbing sheet 22 is configured with a non-magnetic material, and the movable core 17 is fixed to the fixed core 15 with less electromagnetic force. Can be absorbed.

[Third Embodiment]
As shown in FIG. 3, the third embodiment uses a fixed core 15 </ b> A with respect to the fixed core 15 of the first embodiment shown in FIGS. 1 and 2, and has an end opposite to the movable core 17. The portion 15Aa is inserted into a through hole 19a2 provided in the yoke 19 so as to be movable in the same direction as the moving direction of the movable iron core 17.

  An annular flange 15Ab is formed on the side of the movable core 17 of the end 15Aa of the fixed iron core 15A, and an impact absorbing sheet 43 as an elastic member is interposed between the flange 15Ab and the yoke 19. ing. In this case, the fixed iron core 15 </ b> A is supported by the yoke 19 disposed on the side opposite to the movable iron core 17 via the shock absorbing sheet 43. The shock absorbing sheet 43 may be attached to at least one of the flange portion 15Ab and the yoke 19. Other configurations are the same as those in the first embodiment or the second embodiment.

  According to the present embodiment, as in the first embodiment, when the movable iron core 17 is attracted to and moved by the fixed iron core 15, the tip end portion of the inclined surface 17a2 contacts the shock absorbing sheet 22, and the corresponding contact is made. Can be suppressed by the shock absorbing sheet 22.

  At this time, in the present embodiment, the impact absorbing sheet 43 provided between the flange portion 15Ab of the movable iron core 17 and the yoke 19 is elastically deformed so as to be compressed to further absorb the impact, and the collision sound. Can be further reduced. Further, by providing the shock absorbing sheet 43, it is possible to suppress the propagation of the vibration when the movable iron core 17 collides with the fixed iron core 15 side to the yoke 19. For this reason, the shock absorbing sheet 43 also has a function of a damping sheet that suppresses vibration.

  When the movable iron core 17 comes into contact with the shock absorbing sheet 22, the fixed iron core 15 </ b> A moves with respect to the through hole 19 a 2 of the yoke 19 in the moving direction of the movable iron core 17 by substantially elastic deformation. Thereafter, the elastically deformed state of the shock absorbing sheet 43 is restored, and accordingly, the fixed iron core 15A also moves in the restoring direction (movable iron core 17 side) and returns almost to the original position.

[Fourth Embodiment]
As shown in FIG. 4, the fourth embodiment uses a fixed iron core 15B for the fixed iron core 15 of the first embodiment shown in FIGS. 1 and 2, and is similar to the third embodiment. It inserts in the through-hole 19a2 provided in the yoke 19 so that the movement in the same direction as the movement direction of the movable iron core 17 is possible.

  An impact absorbing spring 45 as an elastic member is provided between the fixed iron core 15B and the lower wall 7a of the case body 7. In this case, the fixed iron core 15 </ b> B is supported by the lower wall 7 a of the case body 7 located on the opposite side of the movable iron core 17 via the shock absorbing spring 45.

  Further, an annular flange 15Ba is formed at the end of the fixed iron core 15B opposite to the movable iron core 17, and a damping sheet 47 as an elastic body is provided between the flange 15Ba and the yoke 19. Yes. That is, the damping sheet 47 is disposed between the yoke 19 disposed inside the case body 7 and the flange 15Ba corresponding to the fixed iron core 15B located on the case body 7 side with respect to the yoke 19. It will be provided. The vibration damping sheet 47 may be attached to at least one of the flange portion 15Ba and the yoke 19. Other configurations are the same as those in the first embodiment or the second embodiment.

  According to the present embodiment, as in the first embodiment, when the movable iron core 17 is attracted to and moved by the fixed iron core 15, the tip of the inclined surface 17a2 abuts on the shock absorbing sheet 22, and the corresponding contact is made. The impact noise at the time can be suppressed by the impact absorbing sheet 22. At this time, in the present embodiment, the movable iron core 15B moves in the moving direction of the movable iron core 17 with respect to the yoke 19 and is elastically deformed so that the shock absorbing spring 45 is compressed. It is possible to further reduce the collision sound at the time of contact.

  When the shock absorbing spring 45 is restored after elastic deformation, the fixed iron core 15B is also moved in the restoring direction. At that time, the vibration damping sheet 47 is compressed between the flange 15Ba and the yoke 19 and elastically deformed. Absorb the shock. Thereby, the vibration which propagates from the fixed iron core 15 to the yoke 19 can be suppressed.

  In the fourth embodiment shown in FIG. 4, the shock absorbing sheet 47 need not be provided.

[Fifth Embodiment]
In the fifth embodiment, the movable contact 31 moves in the direction opposite to that of the first embodiment shown in FIG. 1, that is, moves upward in FIG. is doing. In FIG. 5, the same components as those in FIG. 1 are denoted by the same reference numerals.

  The positional relationship between the fixed iron core 15 and the movable iron core 17 here is opposite to that in FIG. 1, and the movable iron core 17 is arranged on the lower wall 7a side of the case body. The fixed iron core 15 is arranged at the upper part in the figure of the movable iron core 17 and the upper end is fixed to the yoke upper plate 21. On the lower wall 7a of the case body 7, a rubber cushion 48 is attached as a cushioning material when the movable iron core 17 moves downward in the drawing so as to be in the state of FIG.

  A through hole 15a that penetrates in the moving direction of the movable iron core 17 is formed in the center of the fixed iron core 15, and a shaft 25 connected to the movable iron core 17 is inserted into the through hole 15a. And the return spring 23 which presses the movable iron core 17 in the direction away from the fixed iron core 15 is accommodated in the said through-hole 15a. The upper end of the return spring 23 is in contact with a pressing plate 49 fixed to the upper surface of the yoke upper plate 21. A spring receiver 51 is disposed further above the pressing plate 49, and a contact pressure spring 33 is interposed between the spring receiver 51 and the movable contact 29.

  The holding plate 49 and the spring receiver 51 are formed with through holes 49a and 51a for inserting the shaft 25, respectively.

  And in this embodiment, the movable contact 31 is attached to the upper surface in the figure on the opposite side to the drive part 1 of the movable contact 29 contrary to 1st Embodiment. A fixed contact 35 facing the movable contact 31 is attached to a fixed contact holding portion 41 provided on the upper wall 9 a of the cover 9 via a fixed terminal 37.

  The fixed terminal 37 here is also integrally formed with the resin-made fixed contact holding portion 41 as shown in FIG. 1 and is not shown, but its end is pulled out of the case 5. The external connection terminal is connected to an external load.

  And in this embodiment, the above-mentioned through-hole 15a is formed in the plane part 15b1 of the recessed part 15b of the fixed iron core 15, The impact as an impact-absorbing member is formed in the plane part 15b1 of the recessed part 15b around this through-hole 15a. An absorbent sheet 22C is arranged. The movable iron core 17 forms an inclined surface 17a2 on the outer peripheral side of the end face 15a3 on the fixed iron core 15 side.

  Next, the operation of the electromagnetic relay according to the fifth embodiment will be described. In the state of FIG. 5 in which the coil 13 is not energized, the elastic force of the return spring 23 overcomes the elastic force of the contact pressure spring 33, the movable iron core 17 is positioned downward in FIG. 5, and the movable contact 31 is a fixed contact. 5 separated from 35, and the contact device is turned off.

  When the coil 13 is energized from this OFF state, the movable iron core 17 moves closer to the fixed iron core 15 by being attracted to the fixed iron core 15 against the elastic force of the return spring 23 by electromagnetic force, and the movable contact 31 is moved. Comes into contact with the fixed contact 35 and these contacts are electrically connected to each other, and the contact device is turned on.

  At this time, also in the present embodiment, when the movable iron core 17 is attracted to and moved by the fixed iron core 15, the end surface 15a3 at the tip of the inclined surface 17a2 comes into contact with the shock absorbing sheet 22C, so that the collision sound at the time of contact is generated. It can be suppressed by the shock absorbing sheet 22C. Thereby, generation | occurrence | production of the abnormal noise to the outside can be suppressed and the reliability of a product can be improved.

7 Case body (case)
13 Coil 15 Fixed iron core (fixing member)
17 Movable iron core (movable member)
19 yoke 22, 22C shock absorbing sheet (shock absorbing member)
31 movable contact 35 fixed contact 43 shock absorbing sheet (elastic member)
45 Shock absorbing spring (elastic member)
47 Damping sheet (elastic body)

Claims (5)

  A stationary member magnetized by energization of the coil; a movable member that moves to be attracted to the stationary member by energization of the coil; a movable contact provided on the movable member; and the movable contact is movable A fixed contact that comes into contact with movement of the member when the movable member moves toward the fixed member, and the movable member contacts the fixed contact when the movable contact contacts the fixed contact. An impact absorbing member that absorbs the impact is provided between the fixed member and the movable member.   The contact device according to claim 1, wherein the shock absorbing member is made of a magnetic material.   The contact device according to claim 1, wherein the fixed member is supported by a yoke disposed on the side opposite to the movable member via an elastic member.   The contact device according to claim 1, wherein the fixed member is supported by a case located on the opposite side of the movable member via an elastic member.   5. The contact device according to claim 4, wherein an elastic body is provided between a yoke disposed inside the case and a fixing member located on a side of the case with respect to the yoke.

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