JP4089189B2 - Electromagnetic relay - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic relay, and more particularly to an arrangement structure of coil terminals.
[0002]
[Prior art]
Conventional electromagnetic relays include those described in Japanese Utility Model Publication No. 56-59749.
That is, a contact piece having one end fixed to the base and the tip elastically contacting the inner wall surface of the relay is arranged at a predetermined angle so as to face the contact piece from the tip of the contact piece. There is a relay structure in which a presser spring holds an armature by urging an armature that opens and closes a relay contact in a return direction of the relay contact.
[0003]
[Problems to be solved by the invention]
However, in the above-described relay structure, downsizing of the device is required, and development of a relay having a small floor area is desired. However, when considering mounting on a printed circuit board or the like, there is a requirement that a predetermined distance is required for the pitch between the terminals. For example, the above-described relay structure requires a minimum thickness (0.3 mm) of the spool resin, a minimum thickness (0.3 mm) of the base side wall, and a minimum thickness (0.3 mm) of the case side wall. That is, the above-described relay structure requires a sealing margin of about 1 mm. Therefore, even if each terminal is arranged with a standard pitch between terminals of 5.08 mm, a total sealing allowance of 2 mm is required before and after. For this reason, in the relay structure described above, a relay having a minimum width of 7.08 mm can only be obtained, and further miniaturization has been difficult.
[0004]
In the above case, it may be possible to adjust the pitch between the terminals by bending the terminals. However, in order to bend the terminals, another processing step is required, which increases the number of production steps. .
[0005]
In view of the above problems, an object of the present invention is to provide an electromagnetic relay having a small floor space and a small production man-hour while ensuring a necessary pitch between terminals.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an electromagnetic relay according to the present invention is constructed by assembling an electromagnet block having coil terminals respectively attached to both sides of a spool wound with a coil to a box-shaped base from above, and a back surface of the box-shaped base. In the electromagnetic relay in which the terminal portions of the coil terminals are respectively protruded from the reference surface which is the other end portion of the two position regulating members cut out from the lead frame insert-molded in the box-shaped base, the through hole of the electromagnet block A plane substantially J-shaped iron core made of a plate-like magnetic material that is inserted through the both ends and is positioned, and each of the electromagnet block is fitted into a notch for fitting formed on the side wall of the box-shaped base. While the both sides of the spool are fitted and exposed, one end edge of a plane substantially L-shaped movable iron piece made of a plate-like magnetic material is rotatably supported on one end of the iron core. The other end of the movable iron piece is opposed to the other end of the iron core so as to be attracted, and the movable iron piece and the movable contact piece that operate based on excitation and demagnetization of the electromagnet block are disposed at the two positions. The position is regulated at one end of the regulating member.
[0007]
Therefore, according to the present invention, if the inter-terminal pitch is minimum, the sealing allowance can be saved by the thickness of the side wall of the box-shaped base. For this reason, an electromagnetic relay having a floor area smaller than that of the conventional example can be obtained while ensuring a predetermined pitch between terminals. In particular, since there is no need to bend the terminals, an electromagnetic relay with a small production man-hour can be obtained.
[0008]
The terminal portion of the coil terminal may be straight.
Therefore, according to this embodiment, since the terminal part of a straight coil terminal can be inserted and assembled into the coil terminal hole of the base from above, an electromagnetic relay that can be easily assembled can be obtained.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described with reference to the accompanying drawings of FIGS.
As shown in FIGS. 1 to 10, the first embodiment according to the present invention is an electromagnetic relay generally including a base 10, an electromagnet block 30, a movable iron piece 60, a movable contact piece 70, and a case 80. is there.
[0010]
The base 10 is formed by insert molding the lead frame 20 shown in FIG. 3A (FIG. 3B) and then bending it (FIG. 2). The lead frame 20 is formed by punching and bending the movable contact terminal 21, the fixed contact terminal 22, the movable iron piece position restricting member 23, and the movable contact piece position restricting member 24.
[0011]
In particular, the terminal portions 21a and 22a of the movable contact terminal 21 and the fixed contact terminal 22 are bent inside the base 10 and positioned on the same straight line (FIG. 7). Further, the fixed contact 22b of the fixed contact terminal 22 is exposed from the bottom surface of the base.
Further, the position restricting tongue pieces 23a, 24a located at one end portions of the movable iron piece position restricting member 23 and the movable contact piece position restricting member 24 are bent at substantially right angles. However, the position restricting tongues 23a and 24a in FIGS. 2 and 3B each show a state in the middle of the manufacturing process.
On the other hand, the positioning portions 23b and 24b, which are the other end portions of the movable iron piece position restricting member 23 and the movable contact piece position restricting member 24, are exposed from the bottom surface of the base 10 so as to be reference surfaces.
[0012]
Further, as shown in FIG. 2, an insulating wall 11a and a partition wall 11b are arranged in parallel on the bottom surface of the base 10, and coil terminal holes 13a and 13b are formed in the vicinity of both sides of the partition wall 11b. Further, a pair of notch portions 14a and 14b for fitting an electromagnet block 30 described later is formed on one of the opposing side walls of the base 10, and an adjustment notch portion 15 is formed on the other side. Has been.
[0013]
As shown in FIGS. 4A and 4B, the electromagnet block 30 includes a spool 32 around which a coil 31 is wound, a pair of coil terminals 40 and 45, and an iron core 50.
The spool 32 has a through hole 32a through which the iron core 50 can be inserted into the body portion 34 having flange portions 33a and 33b at both ends. Base portions 35a and 35b provided with coil terminal holes 34a and 34b extend from the flange portions 33a and 33b. Protrusions 36a and 36b that can be fitted into the notches 14a and 14b of the base 10 are formed on the outward faces of the pedestals 35a and 35b, respectively.
[0014]
The coil terminals 40 and 45 are formed with wide positioning portions 41 and 46, respectively. Then, when the coil terminals 40 and 45 are press-fitted into the coil terminal holes 34a and 34b of the spool 32 from below, the coil binding portions 42 and 47 protrude from the pedestal portions 35a and 35b, respectively.
[0015]
As shown in FIG. 4A, the iron core 50 is made of a plate-like magnetic material having a substantially plane J shape. The iron core 50 has one end portion as a support receiving portion 51 of the movable iron piece 60 described later, and the other end portion as a magnetic pole portion 52.
[0016]
Therefore, after both ends of the coil 31 wound around the body portion 34 of the spool 32 are tangled with the coil binding portions 42 and 47 of the coil terminals 40 and 45 and soldered, an iron core is inserted into the through hole 32a of the spool 32. The electromagnet block 30 is completed by inserting one end 51 of the 50.
In this embodiment, since it is not necessary to insert-mold the iron core 50 and the coil terminals 40 and 45 in the electromagnet block 30, there is an advantage that expensive capital investment can be reduced.
[0017]
Next, the electromagnet block 30 is inserted between the insulating wall 11 a and the partition wall 11 b provided side by side on the base 10. Next, the terminal portions 43 and 48 of the coil terminals 40 and 45 are inserted into the coil terminal holes 13 a and 13 b of the base 10. Thereby, the protrusions 36a and 36b of the electromagnet block 30 are fitted and exposed in the notches 14a and 14b of the base 10, respectively. For this reason, according to the present embodiment, the coil terminals 40 and 45 can be arranged on the outer side by the thickness of the side wall of the base 10 while ensuring a predetermined pitch. As a result, there is an advantage that an electromagnetic relay having a small floor area can be obtained.
[0018]
Further, after the support receiving portion 51 of the iron core 50 is placed on the positioning portion 23b of the position regulating member 23 (FIG. 10C), the bent portion 53 of the iron core 50 is placed on the positioning portion 24b of the position regulating member 24. (FIG. 8B), welding is integrated by resistance welding or laser welding.
According to this embodiment, the electromagnet block 30 can be positioned on the base 10 with high assembly accuracy. In addition, since welding is integrated by resistance welding or the like, there is an advantage that even if thermal stress, impact force or the like is applied, the electromagnet block 30 is not displaced in the base 10 and the operating characteristics do not change.
[0019]
In the above-described embodiment, the case where laser welding is irradiated from above the base 10 toward the bottom surface of the base 10 has been described, but irradiation may be performed from below the base 10 toward the bottom surface.
That is, the iron core 60 may be integrated by welding by providing a laser welding hole on the bottom surface of the base 10 and directly irradiating the positioning portions 23b and 24b visible from the laser welding hole with laser.
In addition, through holes are also provided in the positioning portions 23b and 24b so that the laser welding holes can be seen. And you may integrate with welding by irradiating the iron core 60 piled up in the said through-hole of the positioning parts 23b and 24b with a laser.
Note that at least one portion to be welded and integrated is sufficient. For example, one end of the iron core 50 may be locked to the base, and the other end may be integrated with the positioning portion of the position regulating member by welding.
Further, if a sealing material is injected into the laser welding hole of the base and solidified, the sealing performance is further ensured. In particular, when a through hole is provided in the positioning portion, there is an advantage that the electromagnet block 30 can be more firmly fixed to the base 10.
[0020]
As shown in FIG. 5, the movable iron piece 60 is a plate-like magnetic material having a substantially L-shape in a plane. One end portion 61 has a lower surface edge 61 a as a rotation fulcrum (FIG. 7), and the other end 62. Is an adsorbing portion 62 that adsorbs to the magnetic pole portion 52 of the iron core 50.
[0021]
The movable contact piece 70 is made of a conductive thin leaf spring material. One end of the movable contact piece 70 is bent to form a connection end 71, and a movable contact 72 is provided on the lower surface of the other end (see FIG. 7).
[0022]
The movable contact piece 70 is integrated with the upper surface of the movable iron 60 by welding.
Then, as shown in FIG. 9B, the connection end portion 71 of the movable contact piece 70 is positioned on the connection receiving portion 21b of the movable contact terminal 21 exposed from the bottom surface of the base 10 and integrated by resistance welding or laser welding. Thus, the movable contact 72 faces the fixed contact 22b so as to be able to contact and separate. At this time, as shown in FIG. 7, the straight portion of the bent portion 73 of the movable contact piece 70 and the lower surface edge 61 of the movable contact piece 60 are located on the same vertical plane, so There is an advantage that no deviation occurs.
[0023]
Next, by bending and raising the position restricting tongue piece 23a of the position restricting member 23 and restricting the position of the vicinity of the one end 61 of the movable iron piece 60, the movable iron piece 60 rotates the lower surface edge 61a of the one end thereof at the pivot point. As shown in FIG. 9C. For this reason, there is an advantage that the abrasion powder of the resin is not generated by the operation of the movable iron piece 60 and the contact failure does not occur.
On the other hand, the movable contact piece 70 is position-restricted by bending the position-regulating tongue piece 24a (FIG. 9B). For this reason, there is an advantage that the operation characteristics are determined before the case 80 is mounted, and a product with stable quality can be manufactured.
[0024]
The case 80 has an outer shape that can be fitted to the base 10, and a gas vent hole 81 is provided at the upper surface edge. Then, by fitting the case 80 to the base 10, the protrusions 82 a and 82 b (FIG. 6) protruding from the ceiling surface of the case 80 are connected to the iron core 50 and the coiled portions 42 and 47 of the coil terminals 40 and 45. And each. For this reason, there exists an advantage that creepage distance increases and an insulation characteristic improves.
[0025]
Then, after the case 80 is assembled to the base 10 incorporating the internal components, a sealing material is injected into the back surface of the base 10. Thereby, not only the sealing material seals the gap between the base 10 and the case 80, but also the coil terminal holes 13a and 13b can be sealed. For this reason, the electromagnet block 30 can be firmly fixed to the base 10. In particular, in the present embodiment, the sealing material flows and adheres to and solidifies also on a part that is insert-molded on the base 10 and is visible from the back surface of the base 10. For this reason, there exists an advantage that sealing performance can be ensured still more reliably.
[0026]
Next, the operation of the electromagnetic relay having the above-described configuration will be described.
When the electromagnet block 30 is not excited, the movable iron piece 60 is biased upward by the spring force of the movable contact piece 70, and the movable contact 72 is separated from the fixed contact 22b.
[0027]
When a voltage is applied to the coil 31 to excite the electromagnet block 30, the magnetic pole portion 52 of the iron core 50 attracts the attracting portion 62 of the movable iron piece 60. For this reason, the movable iron piece 60 rotates against the spring force of the movable contact piece 70 using the lower surface edge 61a of the one end 61 of the movable iron piece 60 as a rotation fulcrum. At this time, the position restricting tongue piece 23 a supports the vicinity of the one end portion 61 of the movable iron piece 60 and ensures stable operation of the movable iron piece 60. Then, after the movable contact 72 of the movable contact piece 70 comes into contact with the fixed contact 22 b, the attracting part 62 of the movable iron piece 60 is attracted to the magnetic pole part 52 of the iron core 50.
[0028]
Furthermore, when the application of voltage to the coil 31 is stopped and the electromagnet block 30 is de-energized, the movable iron piece 60 is rotated by the spring force of the movable contact piece 70 and returned to its original position. At this time, the upper surface of the movable contact piece 70 is brought into contact with the position restricting tongue piece 24a to be position restricted.
[0029]
In the second embodiment, as shown in FIG. 11, the terminal portions of the movable contact terminal 21, the fixed contact terminal 22, and the coil terminals 40 and 45 are bent outward to be used as a surface mount electromagnetic relay. It is. Others are substantially the same as those of the above-described embodiment, and thus the description thereof is omitted.
[0030]
In the third embodiment, as shown in FIG. 12, the position regulating member 24 is used as a normally closed fixed contact terminal. That is, common movable contacts 72 (not shown) and 73 are provided on the front and back surfaces of the free end portion of the movable contact piece 70. On the other hand, a fixed contact 24 c is disposed on the lower surface of the one end 24 a of the normally closed fixed contact terminal 24. Therefore, when the movable contact piece 70 is rotated, the movable contacts 72 and 73 are alternately brought into contact with the fixed contacts 22b and 24c, respectively. Others are substantially the same as those of the above-described embodiment, and thus the description thereof is omitted.
[0031]
【The invention's effect】
According to the present invention, if the pitch between terminals is minimum, the sealing allowance can be saved by the thickness of the side wall of the box-shaped base. For this reason, an electromagnetic relay having a floor area smaller than that of the conventional example can be obtained while ensuring a predetermined pitch between terminals. In particular, since there is no need to bend the terminals, there is an effect that an electromagnetic relay with a small production man-hour can be obtained.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an electromagnetic relay showing a first embodiment according to the present invention.
FIG. 2 is an exploded perspective view showing a state where an electromagnet block and a movable iron piece are taken out from the base shown in FIG.
3 is a perspective view showing a manufacturing method of the base shown in FIG. 2, FIG. A is a perspective view of a lead frame, and FIG. B is a perspective view immediately after molding of the base.
4 is an exploded perspective view of the electromagnet block shown in FIG. 2, and FIG. B is a perspective view of the spool viewed from different angles.
5 is an exploded perspective view of the movable iron piece and the movable contact piece shown in FIG. 2. FIG.
FIG. 6 is an exploded perspective view of the first embodiment shown in FIG. 1 as seen from a different angle.
7 is an exploded perspective view showing a state where an electromagnet block and a movable iron piece are taken out from the base shown in FIG. 6. FIG.
8 shows a state after assembly of the electromagnetic relay shown in FIG. 1, FIG. A is a plan view, and FIG. B is a sectional view taken along line BB of FIG.
9 shows the base shown in FIG. 1, FIG. A is a plan view, FIG. B is a sectional view taken along line BB in FIG. A, and FIG. C is a sectional view taken along line CC in FIG.
10 shows a state where the movable iron piece and the movable contact piece are removed from the base shown in FIG. 9, FIG. A is a plan view, FIG. B is a side view of FIG. A, and FIG. FIG.
11 shows a second embodiment of an electromagnetic relay according to the present invention, FIG. A is a plan view, FIG. B is a right side view, and FIG. C is a cross-sectional view taken along line CC in FIG.
FIG. 12 is a perspective view of an electromagnetic relay showing a third embodiment according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Base, 11a ... Insulating wall, 11b ... Partition wall, 13a, 13b ... Coil terminal hole, 14a, 14b ... Notch part, 15 ... Notch part for adjustment, 20 ... Lead frame, 21 ... Movable fixed contact terminal, 21a ... terminal part, 21b ... connection receiving part, 22 ... fixed contact terminal, 22a ... terminal part, 22b ... fixed contact, 23 ... position restricting member, 23a ... position restricting tongue, 23b ... positioning part, 24 ... position restricting member 24a ... Position regulating tongue, 24b ... Positioning part, 30 ... Electromagnet block, 31 ... Coil, 32 ... Spool, 32a ... Through hole, 34 ... Body part, 35a, 35b ... Base part, 36a, 36b ... Projection part, 40, 45 ... Coil terminal, 43, 48 ... Terminal part, 50 ... Iron core, 51 ... Support receiving part, 52 ... Magnetic pole part, 53 ... Bending part, 60 ... Movable iron piece, 61 ... One end part, 61a ... Lower surface edge part , 6 ... suction portion, 70 ... movable contact piece, 71 ... connecting unit, 72 ... movable contact, 73 ... bent part, 80 ... case, 81 ... gas vent hole, 82a, 82b ... protrusion.

Claims (2)

In an electromagnetic relay in which electromagnet blocks each assembled with coil terminals on both sides of a spool wound with a coil are assembled to a box-shaped base from above, and the terminal portions of the coil terminals protrude from the back surface of the box-shaped base. ,
A plane made of a plate-like magnetic material that is inserted into the through hole of the electromagnet block and protrudes from both ends of a reference surface that is the other end of two position regulating members cut out from a lead frame that is insert-molded in the box-shaped base. Each of the substantially J-shaped iron cores is positioned, and both sides of the spool of the electromagnet block are fitted and exposed to the fitting notches formed on the side wall of the box-shaped base, while the plate-like magnetic One end edge of a substantially L-shaped movable iron piece made of a material is rotatably supported on one end of the iron core, and the other end of the movable iron piece can be adsorbed to the other end of the iron core. An electromagnetic relay characterized in that the movable iron piece and the movable contact piece that are opposed to each other and operate based on excitation and demagnetization of the electromagnet block are respectively regulated by one end portions of the two position regulating members.   The electromagnetic relay according to claim 1, wherein a terminal portion of the coil terminal is straight.

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