JP2005063940A - Electromagnet driving apparatus and electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic relay with stable mechanical endurance. <P>SOLUTION: In the electromagnetic relay, a movable block 5 supported rotatably around a support point p is rotated in the direction normal or reverse around the rotational axis by energizing or demagnetising a magnet block 4. The engagement part 27 of the card 3 supported linearly movably in forward or buck ward direction is engaged with a card engaging part 26 formed in the end portion of the movable block 5. The card 3 is reciprocated forward and backward by the normal or reversible rotational movement of the movable block 5 and the contact mechanism is operated to switching the contact mechanism 2. The fictional line L connecting the card engaging part 26 of the movable block 5 and the axis p of the movable block 5 are set approximately ortohgonalized for the moving direction A of the card 3 when the movable block 5 become parallel and neutral for the magnet block 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electromagnet driving device and an electromagnetic relay.

  As an electromagnetic relay, for example, a multi-pole type electromagnetic relay, a movable block that is rotatably supported on a base is rotated forward and backward by excitation and demagnetization of an electromagnetic block, and can be linearly moved in the front-rear direction to the base. A structure is known in which a contact mechanism mounted on a base is switched by engaging with a card as a supported moving body and reciprocating the card back and forth by forward and reverse rotation of a movable block ( For example, see Patent Document 1).

  In this electromagnetic relay, as shown in FIG. 24, a flat projection 43 is provided as an engaging portion at the upper end of a movable block 42 that is arranged to be rotatable about a fulcrum q so as to face the electromagnet block 41. The protrusion 43 is engaged with an engagement hole 45 as an engagement portion formed at the front end of the card 44. Further, a fulcrum shaft 47 is integrally projected on the left and right outer surfaces of the resin block main body 46 constituting the movable block 42 and is rotatably supported by a base (not shown).

  The movable block 42 is configured to rotate in the forward or reverse direction around the fulcrum q by the excitation or demagnetization of the electromagnet block 41, whereby the card 44 is moved in a linear direction and a contact mechanism (not shown) is switched. Has been.

The movable block 42 is configured such that the iron shield 50 of the movable block 42 and the yoke 49 have a predetermined interval when the magnetic shielding projection 48 contacts the yoke 49.
In FIG. 24, the return state of the movable block 42 is indicated by a solid line, and the operation state is indicated by a virtual line.

In this electromagnetic relay, as shown in FIG. 25, the fulcrum shaft 47 is in a neutral state in which the movable block 42 is parallel to the electromagnet block 41, with respect to the projecting piece 43 that is the engaging portion with the card 44. Thus, the electromagnetic block 41 is displaced by a distance W.
Japanese Patent Laid-Open No. 2000-285782

In the electromagnetic relay having such a configuration, the movable block 42 performs an arc motion around the fulcrum q in response to excitation and demagnetization, while the card 44 performs a linear motion in the horizontal direction and the card of the movable block 42. Since the direction of the arc motion of the engaging portion with 44 (the tangential direction of the arc) and the direction of the linear motion of the card 44 do not match , the positional deviation between the movable block 42 and the card 44 is For this reason, undesired stress and sliding are generated at the engaging portion between the movable block 42 and the card 44 and the rotation fulcrum q of the movable block 42.

The present invention has been made paying attention to such a situation, and an object of the present invention is to provide an electromagnet drive device and an electromagnetic relay that can ensure stable mechanical durability.

  In order to achieve the above object, the present invention is configured as follows.

That is, the electromagnetic relay of the present invention has an electromagnet block having an iron core around which a coil is wound, and an iron piece attracted and separated by a magnetic pole portion of the electromagnet block, and is a rotation fulcrum by excitation and demagnetization of the electromagnet block. A movable block that rotates forward and backward around the center, a moving body that is engaged with the movable block and reciprocates in a linear direction according to the forward and reverse rotation, and a switching operation by the movement of the moving body. In the electromagnetic relay including the contact mechanism, the engaging portion of the movable block with the moving body and the rotation fulcrum of the movable block in a neutral state where the movable block is in a parallel posture with respect to the electromagnet block. Is set so as to be substantially orthogonal to the moving direction of the moving body .

Here, the neutral state in which the movable block is parallel to the electromagnet block means that the movable block is not inclined in either the forward direction or the reverse direction with respect to the moving body moving in the linear direction. against electromagnetic block, it refers to a state which are parallel.

According to the present invention, in the neutral state, the rotation fulcrum of the movable block is not deviated with respect to the engaging portion of the movable block with the moving body. The direction of motion (tangential direction of the arc) and the direction of linear motion of the moving body are substantially the same. As a result, when the movable block rotates forward and backward from the neutral state, a positional deviation generated between the movable block and the movable body moving in the linear direction is reduced, and the engagement portion and the rotation fulcrum portion are reduced . The occurrence of uneven wear can be suppressed, and stable mechanical durability can be ensured.

In an embodiment of the present invention, the engaging portion of the movable block with the moving body is approximately halfway between the forward and reverse rotation paths on a virtual circumference around the rotation fulcrum of the movable block. The position is set.

According to this embodiment, the operation stroke from the neutral position of the movable block to the forward direction and the reverse direction becomes uniform, and stable mechanical durability can be secured.

  In a preferred embodiment of the present invention, the movable block is rotatably supported by a resin base via a metal fulcrum shaft.

  According to this embodiment, since the metal and the resin slide, the sliding resistance at the rotation fulcrum is reduced and the rotation characteristics can be stabilized as compared with the sliding between the resins. In addition, the wear can be reduced to further increase the mechanical durability.

  In one embodiment of the present invention, the movable block attaches the iron piece to a resin block main body, and the metal fulcrum shaft that passes through a pair of left and right shaft support portions provided on the base has both ends thereof. The block main body is penetrated and mounted so as to protrude from the block main body, and the facing portion of the iron piece is inserted into a recess formed in the fulcrum shaft.

According to this embodiment, in order to set a virtual line connecting the engaging portion of the movable block with the moving body and the rotation fulcrum so as to be substantially orthogonal to the moving direction of the moving body, Even if an overlapping part occurs, a recess is formed in the metal fulcrum shaft and the iron piece is inserted into the recess, so that the fulcrum shaft can be inserted through the block body even if it is overlapped with the iron piece. Thus, an electromagnetic relay having a specification with improved mechanical durability can be configured without changing the conventional dimensional specifications such as the position of an iron piece necessary for obtaining the attraction characteristics.

  In another embodiment of the present invention, a rib capable of sliding contact with the resin block body is provided on the inner surface of the pair of left and right shaft support portions provided on the base.

  According to this embodiment, when the movable block rotates forward and backward, the side surface of the block main body of the movable block and the shaft support portion are in line contact with each other at the apex portion of the rib, without providing the rib. Compared with the case where the side surface of the block body and the shaft support portion are in surface contact, the frictional resistance is reduced and the slidability is improved.

  In still another embodiment of the present invention, a pair of left and right shaft support portions provided on the base is formed with an insertion hole through which the fulcrum shaft is inserted, and the outer surface side of the shaft support portion has a large diameter. On the other hand, the inner surface side of the shaft support portion is made into a paragraph and has a small diameter.

  According to this embodiment, the insertion hole through which the fulcrum shaft is inserted is formed into a paragraph on the inner surface side of the shaft support portion and is narrowed to a small diameter, so that foreign matters such as dust from the outer surface side are trapped in the paragraph portion. Intrusion into the sliding portion of the fulcrum shaft can be prevented.

  In another embodiment of the present invention, the iron piece is provided with a groove portion that fits into the concave portion of the fulcrum shaft.

  According to this embodiment, the depth of the groove portion of the iron piece and the fulcrum shaft are formed even when there is a large amount of overlap between the iron piece and the fulcrum shaft by fitting the concave portion of the fulcrum shaft and the groove portion provided in the iron piece. The depth of the concave portion formed on the fulcrum shaft can be reduced by the depth of the groove portion of the iron piece, so that the strength of the fulcrum shaft itself can be ensured.

  In still another embodiment of the present invention, the engaging portion of the movable block with the moving body is configured by an engaging protrusion having an arcuate outer peripheral surface and extending parallel to the fulcrum shaft, An engaging hole is formed in the movable body, and the engaging protrusion is inserted between the opposing inner planes of the engaging hole.

  According to this embodiment, since the arc-shaped outer peripheral surface of the engagement protrusion is engaged and supported from the front and rear by the inner plane of the engagement hole, the contact area between the engagement protrusion and the inner surface of the engagement hole is reduced, and the sliding surface is reduced. The dynamic resistance is reduced, and the mechanical durability at this engagement point can be increased.

  In a preferred embodiment of the present invention, at least one of the magnetic pole part and the iron piece is made of a non-magnetic metal that defines a magnetic shielding interval between the iron piece when the iron piece is attracted to the magnetic pole part. A magnetic shielding plate is provided.

  According to this embodiment, since the magnetic shielding plate made of a non-magnetic metal is provided, the variation in the magnetic shielding interval can be reduced as compared with a conventional resin magnetic shielding protrusion, and the destruction by repeated contact can be reduced. It is difficult to occur, and the suction force characteristics, particularly the suction force peak value, become stable.

  Further, by preparing a plurality of types of magnetic shielding plates having different thicknesses, it is possible to select and use an appropriate magnetic shielding plate corresponding to various specifications having different attractive force characteristics.

  In one embodiment of the present invention, the magnetic shielding plate is attached to the iron piece of the movable block so as to face the magnetic pole portion, and the magnetic pole portion has an edge portion with which the magnetic shielding plate abuts. Forming.

  According to this embodiment, since the magnetic shielding plate attached to the iron piece always comes into contact with the edge portion formed in the magnetic pole portion, the magnetic shielding interval does not vary due to variations in the contact position, and the magnetic shielding interval, Therefore, the suction force characteristics are stable.

  In another embodiment of the present invention, the magnetic shielding plate has an attachment hole, and is fixed by caulking to the iron piece through the attachment hole, and the magnetic shielding plate is fixed to the iron piece by the caulking. It is bent so as to be in close contact with.

  According to this embodiment, since the magnetic shielding plate has been subjected to bending in advance, the bent portion extends along the iron piece and adheres due to stress applied when caulking and fixing to the iron piece. There is no problem that the end of the magnetic shielding plate floats up from the iron piece and a sufficient magnetic shielding interval cannot be secured.

  In still another embodiment of the present invention, the magnetic shielding plate includes an adjustment unit that adjusts the magnetic shielding interval.

  According to this embodiment, when a desired attraction force characteristic cannot be obtained due to component variations or the like, a desired attraction force characteristic, in particular, an attraction force peak value is obtained by adjusting the magnetic shielding interval by the adjustment unit. Can do.

  In another embodiment of the present invention, the adjustment portion is a stepped bending portion provided at a portion facing the magnetic pole portion of the magnetic shielding plate.

  According to this embodiment, the magnetic shielding interval can be adjusted by adjusting the step height of the step-folded portion, and thereby the desired attraction force characteristic, particularly the attraction force peak value can be adjusted. .

  In one embodiment of the present invention, an identification hole for identifying the thickness is formed in the magnetic shielding plate.

  According to this embodiment, it is possible to recognize whether or not the magnetic shield plate has a desired thickness by monitoring the number and positions of the identification holes visually or with an optical sensor. Therefore, it becomes easy to avoid assembly mistakes when a plurality of types of magnetic shielding plates are selectively used, which is effective in improving productivity.

  In another embodiment of the present invention, the yoke as the magnetic pole portion is processed to a length corresponding to the attractive force characteristic corresponding to the specifications of the electromagnetic relay.

  According to this embodiment, by processing the yoke and adjusting its length, it is possible to obtain a desired suction force characteristic according to the specifications.

The electromagnet driving device of the present invention has an electromagnet block having an iron core around which a coil is wound, and an iron piece attracted and separated by a magnetic pole portion of the electromagnet block, and is rotated by excitation and demagnetization of the electromagnet block. An electromagnet drive device comprising: a movable block that rotates forward and backward around a fulcrum ; and a moving body that is engaged with the movable block and reciprocates in a linear direction according to the forward and reverse rotation, In a neutral state in which the movable block is parallel to the electromagnet block, an imaginary line connecting the engaging portion of the movable block with the movable body and the rotation fulcrum of the movable block is It is set so as to be substantially orthogonal to the moving direction .

According to the present invention, in the neutral state, the direction of the arc motion of the engaging portion of the movable block with the moving body and the direction of the linear movement of the moving body substantially coincide with each other, so that the movable block rotates forward and backward from the neutral state. When moving, it is possible to reduce the positional deviation between the moving body moving in the linear direction and to suppress the occurrence of uneven wear at the engaging portion and the rotation fulcrum portion, and to stabilize the machine. Durability can be ensured.

In an embodiment of the present invention, the engaging portion of the movable block with the moving body is approximately halfway between the forward and reverse rotation paths on a virtual circumference around the rotation fulcrum of the movable block. The position is set.

According to this embodiment, the operation stroke from the neutral position of the movable block to the forward direction and the reverse direction becomes uniform, and stable mechanical durability can be secured.

  In a preferred embodiment of the present invention, at least one of the magnetic pole part and the iron piece is made of a non-magnetic metal that defines a magnetic shielding interval between the iron piece when the iron piece is attracted to the magnetic pole part. A magnetic shielding plate is provided.

  According to this embodiment, as compared with the conventional resin-made magnetic shielding projections, variations in the magnetic shielding interval can be reduced, and destruction due to repeated contact is less likely to occur, and the attractive force characteristics, particularly the attractive force peak value, can be reduced. It will be stable.

According to the present invention, in the neutral state, the direction of the arc motion of the engaging portion of the movable block with the moving body and the direction of the linear motion of the moving body can be substantially matched, so that the movable block rotates in the forward and reverse directions. when moving, Ki out to reduce the positional deviation occurring between the moving body moving in a linear direction, whereby the pivot point of the engaging portion and the movable block and the movable block and the mobile The occurrence of uneven wear can be suppressed, and stable mechanical durability can be secured.

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

  FIG. 1 shows a longitudinal side view of an electromagnetic relay according to the present invention.

  This electromagnetic relay includes a base 1 made of resin, a multipolar contact mechanism 2 assembled to the base 1, and a moving body for switching contacts that is guided and supported at the upper part of the base so as to be linearly reciprocable in the front-rear direction. Card 3, electromagnet block 4 assembled and fixed to the front end portion (left end portion in the figure) of base 1, card that is supported by base 1 so as to be rotatable around a lateral fulcrum p, and is disposed opposite electromagnet block 4 A movable block 5 for driving, a cover case 6 externally fitted to the base 1, and the like are described. The detailed structure of each part will be described below. In the following description, the left-right direction in the figure is referred to as the front-rear direction, and the front / back direction of the drawing is referred to as the left-right direction.

  A partition wall 1a is erected at the left and right center of the base 1, and contact mechanisms 2 are provided on both sides of the partition wall 1a. Since the contact mechanism 2 provided on both the left and right sides of the partition wall 1a has the same specifications, only the front contact mechanism 2 shown in FIG. 1 will be described. The contact mechanism 2 in this example includes a fixed contact piece 7 and a movable contact piece 8 constituting a set of normally closed circuits, and a fixed contact piece 9 and a movable contact piece 10 constituting two sets of a normally open circuit. The terminals 7 a, 8 a, 9 a, 10 a extending from the contact pieces 7, 8, 9, 10 are protruded from the lower surface of the base 1. Yes.

  As shown in FIG. 12, the fixed contact piece 9 constituting the normally open circuit is formed with press-fitting projections 9b and punch-in press-fitting ribs 9c on the upper and lower sides thereof, respectively. It is press-fit and fastened with a stable posture and high support strength. As described above, the fixed contact piece 9 is provided with the press-fitting protrusions 9b and the press-fitting ribs 9c shifted in the vertical direction in the front-rear direction. Therefore, the fixed contact piece 9 may be inclined when the fixed contact piece 9 is inserted into the base 1. And assembly is improved.

  The card 3 is guided and supported so as to be slidable back and forth at the upper end portion of the partition wall 1a, and each of the movable portions in the contact mechanism 2 is moved to a locking portion 11 formed by projecting a pair of locking projections 3a on the left and right sides. The upper ends of the contact pieces 8 and 10 are latched and supported, and the movable contact pieces 8 and 10 are displaced back and forth by the reciprocating movement of the card 3 to switch the contacts.

  As shown in the partially enlarged view of FIG. 16, the upper ends of the movable contact pieces 8 and 10 slightly protrude above the upper surface of the locking projection 3 a, and are locked by the back and forth movement of the card 3. The protrusion 3 a is configured to press the front and back surfaces of the movable contact pieces 8 and 10.

  Accordingly, for example, as shown in FIG. 17, the upper ends of the movable contact pieces 8 and 10 are lower than the upper surface of the locking projection 3 a, and the locking projection 3 a is moved by the reciprocating movement of the card 3. As in the configuration in which the edge portion at the upper end of the contact piece 8, 10 is pressed, the resin-made locking projection 3a is not worn by the edge portion at the upper end of each of the metal movable contact pieces 8, 10. .

  As shown in FIG. 1, the upper end of a return spring 12 erected from the base 1 is locked to the card 3, and the electromagnetic block 4 is always present on the card 3 by the elastic force of the return spring 12. The return force in the direction (forward) is given.

  As shown in FIG. 6, the electromagnet block 4 has a coil 15 wound around a resin bobbin 14 fitted around the iron core 13, and yokes 16 of both poles are caulked and connected to both upper and lower ends of the iron core 13. The movable block 5 is disposed opposite to the bent end of each yoke 16.

  A pair of terminals 17 connected to the coil 15 project from the lower surface of the base 1, and when the energization to the coil 15 is cut off, the movable block 5 has an upper portion as shown in FIG. As shown in FIG. 3, the upper part of the movable block 5 is rotated rearward to switch the contact point when the coil 15 is returned to the front and excited when the coil 15 is energized.

  As shown in FIGS. 7 and 8, the movable block 5 is adsorbed and fixed at the front center of the iron piece 22, a block body 21 made of resin, an iron piece 22 made of a thick iron plate fitted and fixed to the front surface of the block main body 21. A permanent magnet 23 in the form of a square block, a magnetic shielding plate 24 made of a non-magnetic metal attached to the upper and lower sides of the iron piece 22, and a metal fulcrum shaft 25 inserted through the block body 21 from the left and right. Thus, both ends of the fulcrum shaft 25 projecting from the left and right of the movable block 5 are rotatably inserted and supported by a pair of left and right shaft support portions 60 provided on the base 1 shown in FIGS. ing.

  Since the fulcrum shaft 25 is made of metal as described above, the sliding between the fulcrum shaft 25 and the shaft support portion 60 of the base 1 when the movable block 5 rotates is the sliding between the metal and the resin. Thus, sliding resistance is reduced as compared with sliding between resins, and wear can be reduced and mechanical durability can be increased.

  Furthermore, in this embodiment, in order to improve the slidability between the block main body 21 of the movable block 5 and the shaft support portion 60 of the base 1, the following configuration is provided.

  18 is a partially enlarged view of the vicinity of the shaft support portion 60 of the base 1 that rotatably supports the fulcrum shaft 25 as viewed from the front side, and FIG. 19 shows the inner surface side of the shaft support portion 60 of the base 1. FIG.

  An insertion hole 61 through which the fulcrum shaft 25 is inserted is formed in the shaft support portion 60, and a pair of ribs 62 extending in the front-rear direction are provided above and below the insertion hole 61 on the inner surface of the shaft support portion 60. Thus, when the movable block 5 rotates in the forward and reverse directions, the side surface of the block main body 21 of the movable block 5 and the shaft support portion 60 come into line contact at the apex portion of the rib 62.

  Therefore, without providing the rib 62, the frictional resistance is reduced and the slidability is improved as compared with the case where the side surface of the block main body 21 of the movable block 5 and the shaft support portion 60 are in surface contact.

  Further, in this embodiment, as shown in FIG. 20, the periphery of the insertion hole 61 on the outer surface side of the shaft support portion 60 of the base 1 is made into a paragraph, and the insertion hole 61 that penetrates the shaft support portion 60 in and out. The inner surface side of the shaft support portion 60 is narrowed down to a small diameter by a paragraph, while the outer surface side is formed to have a large diameter.

  The outer surface side of the section 63 suppresses foreign matter such as dust from being trapped and entering the sliding portion of the fulcrum shaft 25, thereby preventing deterioration of slidability. .

  Further, in this embodiment, since the iron piece 22 and the fulcrum shaft 25 can be arranged in the molding die and insert molding can be performed, the assemblability is improved.

  In this embodiment, as shown in FIG. 7 and FIG. 8, an engaging protrusion 26 that is a card engaging portion is integrally formed on the upper end portion of the block main body 21 constituting the movable block 5. An arcuate outer peripheral surface s that extends in parallel with the fulcrum p and has a substantially cylindrical shape is formed on the engagement protrusion 26 in the front-rear direction, and the engagement protrusion 26 is formed on the card shown in FIG. The card 3 is reciprocally moved back and forth by forward and reverse rotation of the movable block 5.

  Here, as shown in FIGS. 1 to 3, the engagement hole 27 of the card 3 is configured in a plane in which front and rear inner surfaces face each other in parallel, and a circle in the engagement protrusion 26 is formed between the inner planes. The arc-shaped outer peripheral surface s is engaged with a slight margin.

  In this manner, the arc-shaped outer peripheral surface s of the engagement protrusion 26 extending in parallel along the fulcrum p is engaged and supported from the front and rear by the inner plane of the elongated rectangular engagement hole 27 of the card 3. Compared with the conventional example shown in FIG. 24, which is engaged by the protruding piece, the contact area between the engaging protrusion 26 and the inner plane of the engaging hole 27 can be reduced, and the sliding resistance can be reduced. The mechanical durability at the joint can be increased.

  In addition, on the upper end of the arc-shaped outer peripheral surface s of the engagement protrusion 26, a convex portion 26a extending left and right is formed in order to smoothly flow the resin during molding into a perfect circular arc. As a result, the arc-shaped outer peripheral surface s becomes closer to a perfect circular arc, so that sliding with the engagement hole 27 of the card 3 is stabilized and friction is reduced.

  Further, in this embodiment, in order to ensure stable mechanical durability, the rotation fulcrum p of the movable block 5 is set so that the movable block 5 is located with respect to the electromagnet block 4 as shown in FIGS. The virtual line L connecting the center of the engaging protrusion 26 constituting the card engaging portion and the rotation fulcrum p of the movable block 5 is orthogonal to the card moving direction A when the neutral state is in a neutral posture that is parallel to each other. It is set to be.

Thus, when in the neutral state, the imaginary line L connecting the center of the engaging protrusion 26 constituting the card engaging portion and the rotation fulcrum p of the movable block 5 is orthogonal to the card moving direction A. Therefore, the direction of the arc motion of the engaging projection 26 of the movable block 5 (the tangential direction of the arc) and the direction of the linear motion of the card 3 can be matched, so that the movable block 5 is in the normal state from the neutral state. The amount of vertical displacement of the engaging protrusion 26 when rotating in the reverse direction can be made smaller than in the conventional example.

Further, as shown in FIG. 5, the center of the engaging protrusion 26 that is the engaging portion of the movable block 5 with the card 3 in the neutral state in which the movable block 5 is parallel to the electromagnet block 4. It is set at an intermediate position of a forward / reverse rotation path on a virtual circumference u with the rotation support point p of 5 as the center. Thereby, the rotation stroke from the neutral state of the movable block 5 to the forward direction and the reverse direction is the same.

  In the neutral state, the front surface of the iron piece 22 of the movable block 5 is parallel to the opposing surface of the yoke 16 of the electromagnet block 4.

In this way, in the neutral state, the direction of the arc motion (tangential direction of the arc) of the engaging projection 26 of the movable block 5 and the direction of the linear motion of the card 3 are matched, so that compared with the conventional example of FIG. Thus, the amount of vertical displacement of the engaging projection 26 when the movable block 5 rotates forward and backward can be reduced, and thereby the position generated between the card 3 moving linearly in the front-rear direction. Ru it is possible to reduce the deviation. Therefore, it is possible to suppress the occurrence of uneven wear in the engaging portion and the rotation fulcrum portion of the movable block 5 of the movable block 5 and the card 3, so that can ensure a stable mechanical durability.

  When the rotation fulcrum p is set as described above, the iron piece 22 and the fulcrum shaft 25 are overlapped when viewed from the fulcrum axis direction in the conventional dimension specification of the rotation block. Therefore, as shown in FIGS. 5 and 8, the fulcrum shaft 25 is recessedly inserted at a portion facing the back surface of the iron piece 22, and the back portion of the iron piece 22 is engaged with the recess 31 of the fulcrum shaft 25. And the fulcrum shaft 25 are overlapped with the fulcrum shaft 25, and the fulcrum shaft 25 is attached to the left and right.

  In this example, the pivot fulcrum p, that is, the axis of the fulcrum shaft 25 is positioned slightly in front of the back surface of the iron piece 22, so that the shallow groove 32 is formed on the back surface of the iron piece 22 with the depth of the penetration amount. By forming and fitting this shallow groove 32 into the recess 31 of the fulcrum shaft 25, the cross-sectional shape of the fulcrum shaft part cut out by the recess is made semicircular, and the strength of the fulcrum shaft 25 is ensured. .

  Thus, it was confirmed that even if the shallow groove 32 was formed in the iron piece 22, the performance was not impaired.

  In this embodiment, as shown in FIG. 7 and FIG. 8, two upper and lower portions of the iron piece 22 are provided with caulking pins 28 by stamping press work from the back, and the magnetic shielding plate 24 is attached. The caulking pin 28 is mounted and fixed by caulking through the hole 29.

  In this way, the caulking pin 28 is formed by punching from the back surface of the iron piece 22. For example, it is not necessary to form a hole penetrating the iron piece 22 in the front-rear direction and insert a caulking pin as a separate part. Are better.

  Furthermore, in this embodiment, when the magnetic shielding plate 24 is fixed to the iron piece 22 by caulking, the end portion of the magnetic shielding plate 24 does not float from the iron piece 22 and is securely adhered, as shown in FIG. ), The magnetic shielding plate 24 is bent in the shape of a “<” in the vicinity of the middle in the vertical direction, and before the caulking is fixed, the middle in the vertical direction is the iron piece. 22 is slightly lifted.

  When caulking is fixed in this state, as shown in FIG. 21B, the bent magnetic shielding plate 24 extends along the iron piece 22 due to the stress applied at that time, so that the magnetic shielding is performed. A stable interval can be secured.

  As shown in FIG. 4, the magnetic shielding plate 24 gives a desired magnetic shielding interval between the iron piece 22 and the yoke 16 as the magnetic pole portion when the movable block 5 is rotated to the stroke end. A suction force characteristic, particularly a suction force peak value is set.

  Conventionally, since the shielding interval is obtained by the resin shielding projection 48, the shielding interval is likely to vary, and the shielding interval is reduced by the destruction of the shielding projection 48 due to repeated contact operation. It tends to become smaller gradually, and it has been difficult to stably secure a desired suction force peak value and suction force characteristics. On the other hand, in this embodiment, since the magnetic shielding interval is obtained by the magnetic shielding plate 24 made of a non-magnetic metal, there is little variation in the magnetic shielding interval, and destruction by repeated contact is avoided. It is difficult to generate, and the suction force characteristics, particularly the suction force peak value, can be secured stably.

  Furthermore, in this embodiment, as shown in FIGS. 4 and 6, an edge portion e is formed on the outer surface of the yoke 16, and the front surface of the magnetic shielding plate 24 is always on the edge portion e. By bringing them into contact with each other, a constant magnetic shielding interval can be secured stably.

  Further, in this embodiment, when configuring electromagnetic relays with different specifications, the attractive force characteristics are different. In such a case, the magnetic shielding can be achieved by attaching the magnetic shielding plates 24 having different thicknesses. The distance is changed so that the suction force characteristics according to the specifications are obtained.

  In this case, in order to prevent wrong assembly of the magnetic shielding plates 24, the magnetic shielding plates 24 are identified as shown in FIG. 8 in correspondence with the magnetic shielding intervals obtained by mounting, that is, differences in thickness. The hole 30 is formed, and the presence or absence, the number, and position of the identification hole 30 can be avoided by visually or by monitoring with an optical sensor, the assembly of the shield plate other than the required specification can be avoided. Is taken into account.

  Furthermore, as another embodiment of the present invention, as shown in FIG. 10 and FIG. 11, by using a magnetic shielding plate 24 provided with a stepped bending portion 24a as an adjustment portion at a portion that contacts the edge portion e. When the shielding interval corresponding to the desired attractive force characteristic cannot be obtained, the overall thickness H is adjusted by adjusting the height h of the step as shown in the partially enlarged sectional view of FIG. Thus, a magnetic shielding interval corresponding to a desired attractive force characteristic may be obtained.

  Here, FIG. 14 is a diagram illustrating the attractive force characteristics, in which the horizontal axis indicates the stroke and the vertical axis indicates the attractive force.

  In order to perform stable contact switching, the spring load characteristic C1 including the return spring 12, the movable contact pieces 8 and 10 and the like needs to be within the operating attractive force characteristic C2 and the restored attractive force characteristic C3. However, the spring load characteristic C1 may not fit between the operating attractive force characteristic C2 and the restored attractive force characteristic C3 due to variations in parts.

  In this case, the attractive force peak values p2 and p3 of the attractive force characteristics C2 and C3 can be varied by adjusting the height h of the step difference of the stepped bent portion 24a of the magnetic shield plate 24 to vary the magnetic shielding interval. The spring load characteristic C1 is adjusted so as to fall between the operating attractive force characteristic C2 and the restored attractive force characteristic C3. If the magnetic shielding interval is widened, the attractive force peak value decreases, and if it is narrowed, it increases. The other attracting force peak values p2 'and p3' can be adjusted by the other shield plate 24 of the pair of upper and lower shield plates 24.

  Thus, the magnetic shielding interval mainly adjusts the attractive force peak value in the attractive force characteristic.

  Therefore, in this embodiment, as shown in FIG. 15, the yoke 16 of the electromagnet block 4 is processed and its length D is adjusted to adjust the slope of the characteristic curve in the attractive force characteristic of FIG. is there.

  Specifically, when a desired suction force characteristic cannot be obtained, the yoke 16 is cut short to make the slope of the characteristic curve gentle.

  The adjustment of the length D of the yoke 16 may be performed for both of the pair of yokes 16 or only one of the yokes 16 in accordance with the required attractive force characteristics.

  By processing the yoke 16 and adjusting the magnetic shielding interval by the magnetic shielding plate 24, the attractive force characteristics can be easily changed and adjusted, and electromagnetic relays having different specifications can be easily handled.

  Even when the desired attractive force characteristic cannot be obtained due to variations in parts or the like, the desired attractive force characteristic can be obtained by processing the yoke 16 and adjusting the magnetic shielding interval by the magnetic shielding plate 24.

(Other embodiments)
FIG. 22 is a front view of the movable block 5 according to another embodiment of the present invention, and FIG. 23 is a sectional view taken along the line AA.

  The movable block 5 is insert-molded as described above. However, at the time of this insert-molding, the resin enters between the iron piece 22 and the permanent magnet 23 to prevent the problem that the magnetic force is not stabilized. For this reason, in this embodiment, a hollow portion 64 into which resin does not flow is formed at the boundary portion between the iron piece 22 and the permanent magnet 23 by a molding die.

  As another embodiment of the present invention, the fulcrum shaft 25 of the movable block 5 may be integrally projected on the left and right outer surfaces of the resin block main body 21. According to this, although it is somewhat inferior in abrasion resistance compared with the case where the metal fulcrum shaft 25 is assembled, it can be implemented at low cost.

  The specific structure of the engaging portion between the movable block 5 and the card 3 is not limited to the above-described embodiment. For example, the card engaging portion of the movable block 5 is constituted by a protruding piece having an upward groove. The engaging portion of the card 3 may be formed of a round shaft body in the left-right direction, and the grooved protrusion of the movable block 5 may be engaged with the round shaft body from below.

  The engaging protrusion 26 of the movable block 5 may be made of metal and its surface may be mirror finished.

  In the above-described embodiment, the description is applied to an electromagnetic relay. However, the electromagnet driving device of the present invention is not limited to an electromagnetic relay, but can be applied to a contactor, an actuator, or the like.

  In the above-described embodiment, the magnetic shielding plate 24 is attached to the iron piece 22 side. However, as another embodiment of the present invention, it may be attached to the yoke 16 side of the electromagnet block 4.

  Of course, the magnetic shielding plate 24 is not limited to phosphor bronze, and other nonmagnetic metals such as aluminum, copper, and silver may be used.

  As another embodiment of the present invention, a protrusion may be formed on the yoke 16, and the magnetic shielding plate 24 may be brought into contact with the edge portion of the protrusion.

  Further, the magnetic shielding plate 24 is not limited to the above-described shape as long as it can obtain a constant magnetic shielding interval.

  The present invention is useful for electromagnetic relays and actuators.

It is a vertical side view in the demagnetization state of the electromagnetic relay which concerns on this invention. It is a side view which shows the principal part in an operation neutral state. It is a side view which shows the principal part in an excitation state. It is an enlarged view of the principal part in FIG. It is a vertical side view of a movable block. It is a perspective view of an electromagnet block. It is a perspective view of a movable block. It is the disassembled perspective view of a movable block. It is a perspective view of a movable block and the card | curd driven by engagement with this. It is a perspective view which shows the magnetic shielding board of the other Example. It is a vertical side view which shows the principal part at the time of mounting | wearing with the magnetic-shield board of another Example. It is a perspective view of the fixed contact piece which comprises a contact mechanism. It is a partially expanded sectional view of the magnetic shielding board of FIG. It is a figure which shows a suction force characteristic. It is a figure which shows the yoke length of an electromagnet block. It is a partially expanded view which shows the upper end of a movable contact piece and the latching protrusion of a card | curd. It is a figure corresponding to FIG. 16 of other embodiment. It is the partially expanded view which looked at the axial support part vicinity of the base which supports a fulcrum axis | shaft rotatably. It is a perspective view which shows the inner surface of the axial support part of a base. It is a perspective view which shows the outer surface side of the axial support part of a base. It is a side view which shows the state before and behind fixing a magnetic shielding board to an iron piece. It is a front view of the movable block 5 of other embodiment of this invention. It is sectional drawing which follows the AA line of FIG. It is a side view which shows the principal part of the conventional electromagnetic relay. It is a side view which shows the neutral state of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Contact mechanism 3 Card 4 Electromagnet block 5 Movable block 16 Yoke 21 Block main body 22 Iron piece 24 Magnetic shield 25 Support point shaft 26 Card engagement part (engagement protrusion) 27 Engagement part (engagement hole)
28 Caulking Pin 30 Recognizing Hole 31 Recess 32 Shallow Groove 60 Shaft Support 61 Inserting Hole A Card Moving Direction e Edge Part p Supporting Point s Cylindrical Outer Surface L Virtual Line

Claims (16)

An electromagnet block having an iron core around which a coil is wound, a movable block that has an iron piece attracted and separated from the magnetic pole portion of the electromagnet block, and that rotates forward and backward by excitation and demagnetization of the electromagnet block; In an electromagnetic relay including a moving body that is engaged with a block and reciprocates in a linear direction according to the forward and reverse rotation, and a contact mechanism that is switched by the movement of the moving body.
In the neutral state in which the movable block is parallel to the electromagnet block, the engaging portion of the movable block with the moving body is positioned on the positive circumference on the virtual circumference centering on the pivot point of the movable block. An electromagnetic relay characterized by being set to an intermediate position or a substantially intermediate position of a reverse rotation path.   The electromagnetic relay according to claim 1, wherein the movable block is rotatably supported by a resin base via a metal fulcrum shaft.   The movable block attaches the iron piece to a resin block main body, and the metal fulcrum shaft that passes through a pair of left and right shaft support portions provided on the base so that both ends thereof protrude from the block main body. The electromagnetic relay according to claim 2, wherein the electromagnetic relay is inserted through the block main body, and a facing portion of the iron piece is inserted into a recess formed in the fulcrum shaft.   The electromagnetic relay according to claim 3, wherein a rib capable of sliding contact with the resin block body is provided on the inner surface of the pair of left and right shaft support portions provided on the base.   The pair of left and right shaft support portions provided in the base are formed with insertion holes through which the fulcrum shafts are inserted, and the insertion holes are formed on the outer surface side of the shaft support portion with a large diameter, while the inner surface of the shaft support portion The electromagnetic relay according to claim 3, wherein the side is made into a paragraph and has a small diameter.   The electromagnetic relay according to claim 3, wherein a groove portion that fits into the concave portion of the fulcrum shaft is formed in the iron piece.   The engaging portion of the movable block with the moving body is configured by an engaging protrusion having an arcuate outer peripheral surface and extending in parallel with the fulcrum shaft, while an engaging hole is formed in the moving body. The electromagnetic relay according to any one of claims 1 to 6, wherein the engagement protrusion is inserted between inner planes of the engagement holes facing each other.   2. A magnetic shielding plate made of a nonmagnetic metal is provided on at least one of the magnetic pole part and the iron piece to define a magnetic shielding interval between the iron piece when the iron piece is attracted to the magnetic pole part. The described electromagnetic relay.   The electromagnetic relay according to claim 8, wherein the magnetic shielding plate is attached to the iron piece of the movable block so as to face the magnetic pole portion, and an edge portion with which the magnetic shielding plate abuts is formed on the magnetic pole portion. .   The magnetic shielding plate has an attachment hole, and is caulked and fixed to the iron piece through the attachment hole, and the magnetic shielding plate is bent so as to be in close contact with the iron piece by the caulking. The electromagnetic relay according to claim 9.   The electromagnetic relay according to claim 8, wherein the magnetic shielding plate includes an adjustment unit that adjusts the magnetic shielding interval.   The electromagnetic relay according to claim 11, wherein the adjustment portion is a stepped bending portion provided at a position opposite to the magnetic pole portion of the magnetic shield.   The electromagnetic relay according to any one of claims 8 to 12, wherein an identification hole for identifying a thickness of the magnetic shielding plate is formed.   The electromagnetic relay according to any one of claims 8 to 13, wherein the yoke as the magnetic pole portion is processed to a length corresponding to an attractive force characteristic corresponding to a specification of the electromagnetic relay. An electromagnet block having an iron core around which a coil is wound, a movable block that has an iron piece attracted and separated from the magnetic pole portion of the electromagnet block, and that rotates forward and backward by excitation and demagnetization of the electromagnet block; An electromagnet drive device comprising a movable body engaged with a block and reciprocating in a linear direction in accordance with the forward and reverse rotation,
In the neutral state in which the movable block is parallel to the electromagnet block, the engaging portion of the movable block with the moving body is positioned on the positive circumference on the virtual circumference centering on the pivot point of the movable block. An electromagnet drive device characterized by being set to an intermediate position or a substantially intermediate position of a reverse rotation path.   16. A magnetic shielding plate made of a non-magnetic metal is provided on at least one of the magnetic pole part and the iron piece to define a magnetic shielding interval between the iron piece when the iron piece is attracted to the magnetic pole part. The electromagnet drive device described.