JPS6255255B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to an electromagnetic relay with an improved assembly structure.

[Prior Art] Conventionally, in this type of electromagnetic relay, a contact piece block consisting of a movable contact piece and a fixed contact piece is removably fixed to an insulating stand to which a coil spool is fixed, and the contact mechanism is made to have compatibility. There are known devices that have improved assembly structures such as being able to stand up. (Tokukai Akira
(Refer to No. 50-118242) The contact piece block mentioned above is formed by fixing the base ends of the movable contact piece and the fixed contact piece to a mounting base made of synthetic resin, and the contact piece block is mounted on another insulating base. While the base is fixed, the free end of the fixed contact piece is held and positioned between a pair of tongue pieces protruding from the upper collar of the coil spool. However, since the tongue piece is weak in strength, the free end portion of the fixed contact piece cannot be held securely, and the position of the contact point cannot be precisely regulated.

In addition, the free end of the movable contact piece is in contact with a card that is linked to the movable iron piece, and carbon adheres to the abutting part due to arcing caused by the opening and closing of the contact.
If the free ends of the plurality of movable contact pieces are in contact with the card, there is a risk of an electrical short circuit occurring via the carbon.

[Objective] This invention was made to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide an electromagnetic relay in which the position of the contacts is accurately regulated and does not cause electrical shoot.

[Configuration and Effects of the Invention] The electromagnetic relay according to the present invention has upper and lower magnetic pole surfaces exposed from a pair of collars of a coil spool whose lower collar is fixed to a terminal block, and a U-shaped iron core is attached to the spool. The proximal end of the movable iron piece is brought into contact with the lower magnetic pole surface of the iron core, and the movable iron piece is rotatably supported by a hinge on the lower rib, and the free end of the movable iron piece is brought into contact with and separated from the upper magnetic pole surface. an extending piece is integrally formed on the upper flange of the spool, and at least one pair of fixed contact pieces and a movable contact piece inserted between these are arranged so as to face each other on the terminal block. and fixing each proximal end of the fixed contact piece, and fitting each free end of the fixed contact piece into a groove formed on the lower surface of the extending piece,
The free end of the movable contact piece is made to protrude upward through a hole that is located between these grooves and passes through the extending piece from above and below, and the free end of the movable contact piece and each free end of the movable iron piece are connected to each other. This feature is characterized in that the two are connected by engaging an electrically insulating card.

With the above configuration, the positions of the iron core, spool, fixed and movable contact pieces are determined with reference to the terminal block, and these parts are assembled with high precision.

In addition, the free end of the fixed contact piece is fitted into the groove of the extending piece to regulate its position, so the contact spacing between the contacts is always maintained constant and the contact pressure with the movable contact is constant. As a result, the contact properties of the contacts are improved.

Furthermore, when the movable iron piece returns, since the set interval between both fixed contacts is kept constant, the pressure at which the movable contact separates from the fixed contact and comes into contact with the fixed contact can also be kept constant.

However, since the contact pressure part between the free end of the movable contact piece and the card is separated from the contact by an extension piece protruding from the upper flange of the spool, arcs occur when the movable contact and the fixed contact come into contact and separate. This prevents metal powder and carbon generated from adhering to the pressure contact area of the card, and even when the free ends of multiple movable contact pieces are in contact with the card, the electrical insulation between each movable contact piece is maintained. can be sufficiently increased.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

In FIG. 1, 9 is a spool around which an electromagnetic coil 10 is wound, and this spool 9 has a U-shaped iron core 1.
1, and two protrusions 13, 1 located on the lower side of the iron core 11 on the lower side flange 12 of the spool 9 on the left and right.
3, (see FIG. 2) are provided by molding, respectively. The protrusions 13, 13 contact the protrusion setting surface 14 of the lower flange portion 12 with the upper surface portion 16 of the terminal block 15, and open the respective holes 1 provided in the terminal block 15.
7 and 17 are fitted, and the tip part 1
8 and 18 are thermally fused to the lower surface portion 19 of the terminal block 15.

As shown in FIGS. 1 and 5, the lower collar portion 12 of the spool 9 further includes a lower protrusion 2 that protrudes laterally.
0 and a pair of left and right upper protrusions 21, 21 are integrally molded. The lower protruding piece 20 supports the base end 23 of the movable iron piece 22, and the upper protruding pieces 21, 21 fit into recesses 24, 24 formed on both sides of the movable iron piece 22 to move the iron piece 22 in the left-right direction. is positioned. Further, a stopper 26 is integrally formed on the upper flange portion 25 of the spool 9, and the return position of the movable iron piece 22 is regulated by the stopper 26.

A hinge spring 27 is fixed to the movable iron piece 22 and crimped to the upright surface 28 of the terminal block 15. This spring 27 allows the base end 23 of the movable iron piece 22 to
At the same time, the free end 30 of the movable iron piece 22 is spaced apart from the upper magnetic pole surface 31 of the iron core 11 and brought into contact with the stopper 26 .

1 and 3, 32 and 33 are fixed contact pieces, 34 is a movable contact piece, and these contact pieces 3
The base ends 35, 36, 37 of 2, 33, 34 are external terminals 38, 3 that are insert-molded in the middle of each through hole 44, 45, 46 formed in the terminal block 15.
They are fixed to the inner ends 41, 42, 43 of 9, 40 by spot welding.

When fixing, each of the contact pieces 32, 33, 3
The base ends 35, 36, 37 of 4 are external terminals 38, 3
After contacting the inner ends 41, 42, 43 of the terminal blocks 15, spot welding electrodes (not shown) are inserted into the through holes 44, 45, 46 of the terminal block 15 from above and below, Base end portions 35, 36, 37 of each of the contact pieces 32, 33, 34, external terminals 38, 39,
The inner ends 41, 42, 43 of 40 are spot welded.

Next, the protrusions 13, 13 protruding from the lower flange 12 of the spool 9 connect to the holes 17, 17 of the terminal block 15.
At the same time, the free ends 47 and 48 of the fixed contact pieces 32 and 33 are fitted to the upper collar part 25 of the spool 9.
After being fitted and positioned in the grooves 50, 51 formed in the extending piece 49, the tips 18, 18 of each of the protrusions 13, 13 are thermally fused to the lower surface 19 of the terminal block 15.

In FIG. 4, 52 indicates both side portions 5 of the iron core 11.
3 and 53 as guide walls, and one end of this card 52 has the above-mentioned extending piece 49.
A pressing piece 56 is formed to press the free end 55 of the movable contact piece 34 protruding from the hole 54 (see FIG. 1). As shown in FIG. 3, pieces 57, 57 on both sides of one end of the card 52 fit into recesses 58, 58 formed on both sides of the movable contact piece 34, and are slidably supported by the movable contact piece 34. . Further, as shown in FIGS. 1 and 4, the pieces 59 on both sides of the other end of the card 52 are locked to the free end 30 of the movable iron piece 22.

In FIG. 1, 60, 61, 62 are the contacts of each contact piece 32, 33, 34, and 63 is the electromagnetic coil 10.
and a dielectric breakdown prevention plate disposed between the fixed contact piece 32 and the case. Further, in FIG. 2, 65 and 66 are external terminals of the electromagnetic coil 10 provided on the terminal block 15 by molding.

In FIG. 1, when the electromagnetic coil 10 is energized, the iron core 11 is excited, and the movable iron piece 22 is attracted to the upper magnetic pole face 31 of the iron core 11 with its base end 23 as the center of rotation. As a result, the card 52 is pushed in the direction of arrow 67, and the pressing piece 56 of the card 52
Then, the movable contact piece 34 is bent backward, and the contact 62 of the same contact piece 34 is separated from the contact 60 of the fixed contact piece 32 and comes into contact with the contact 61 of the other fixed contact piece 33.

When the electricity is turned off, the elastic force of the hinge spring 27 causes the movable iron piece 22 to return, the card 52 is pulled back, and the movable contact piece 34 returns due to its own elasticity, causing the contact points 61 and 62 to return to their original positions. is open, and the contacts 60 and 62 are closed.

As is clear from the above configuration, the iron core 11, the spool 9, the fixed and movable contact pieces 32, 33, 34
The setting position of is determined based on the terminal block 15,
Each of these parts is assembled with high precision.

In addition, the free ends 47, 4 of the fixed contact pieces 32, 33
8 is fitted into the grooves 50, 51 of the extension piece 49 to regulate its position, so that the contact distance between the contacts 60 and 61 is always maintained constant, and the contact pressure with the movable contact 62 is constant. As a result, the contact properties of the contacts are improved.

That is, the free ends 47 of the fixed contact pieces 32, 33,
48 is fixed to an extending piece 49 that is integrated with the upper flange portion 25 of the spool 9, and its position is regulated.Since the iron core 11 is embedded and integrated with the spool 9, the upper magnetic pole face 31 of the iron core 11 The distance between the fixed contacts 60 and 61 is maintained constant, so that when the free end 30 of the movable iron piece 22 is attracted to the upper magnetic pole face 31 based on the excitation of the electromagnetic coil 10, the distance between the movable iron piece 22 and the fixed contacts 60 and 61 is maintained constant. The free end 55 of the movable contact piece 34 moves toward the fixed contact piece 33 via the card 52 by the operating stroke S, and the pressure with which the movable contact 62 contacts the fixed contact 61 can be kept constant.

Furthermore, when the movable iron piece 22 returns, since the set interval between the fixed contacts 60 and 61 is kept constant, the pressure at which the movable contact 62 separates from the fixed contact 61 and contacts the fixed contact 60 is also kept constant. be able to.

Moreover, since the contact area between the free end 55 of the movable contact piece 34 and the card 52 is separated from the contacts 60, 61, 62 by the extension piece 49 provided protruding from the upper flange 25 of the spool 9, Metal powder and carbon generated by the arc when the movable contact 62 and the fixed contacts 60 and 61 come into contact and separate are prevented from adhering to the contact pressure portion of the card 52, and the free ends 5 of the plurality of movable contact pieces 34 are prevented from adhering to the contact pressure portion of the card 52.
5 is in contact with the card 52, the electrical insulation between the movable contact pieces 34 can be sufficiently increased.

In the above embodiment, each contact piece 32, 33,
34 and the external terminals 38, 39, 40 are separately constructed and are integrally formed by spot welding. 40 may be implanted in the terminal block 15 by insert molding, in which case each through hole 44, 45, into which a spot welding electrode (not shown) is inserted. It goes without saying that there is no need to form 46 on the terminal block 15.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view showing an example of an electromagnetic relay according to the present invention, Fig. 2 is a sectional view taken along line 2-2 in Fig. 1, and Fig. 3 is a sectional view taken along line 3-3 in Fig. 1. , FIG. 4 is a sectional view taken along line 4-4 in FIG. 1, FIG. 5 is a front view showing the relationship between the movable iron piece and the spool, and FIG. 6 is a sectional view showing a modification of the spool fixing structure. It is. 9... Coil spool, 10... Electromagnetic coil, 11
...Iron core, 12...Lower flange, 15...Terminal block, 22
...Movable iron piece, 25...Upper flange, 23...Base end of movable iron piece, 27...Hinge spring, 29...Lower magnetic pole face, 30...Free end of movable iron piece, 31...Upper magnetic pole face, 32, 33... Fixed contact piece, 34... Movable contact piece, 35, 36... Base end of fixed contact piece, 37... Base end of movable contact piece, 38, 39, 40... External terminal, 47, 48... Looseness of fixed contact piece. End portion, 49... Extension piece, 50, 51... Groove, 52... Card, 54...
Hole, 55...free end of the movable contact piece.

Claims (1)

[Claims] 1. A coil spool in which an electromagnetic coil is wound between a pair of ribs protruding from both upper and lower ends, and a coil spool that passes through the center of the electromagnetic coil and exposes the upper and lower magnetic pole surfaces from the upper and lower ribs. The base end is in contact with the lower magnetic pole surface of the core, the lower rib is rotatably supported by a hinge spring, and the free end touches and separates from the upper magnetic pole surface. movable iron pieces that are arranged to face each other with a predetermined interval between them; a terminal block to which the lower flange of the spool is fixed;
an extension piece integrally formed on the upper flange of the spool and arranged opposite to the terminal block; and an extension piece that is arranged opposite to each other and electrically connected to an external terminal whose base end is fixed to the terminal block. at least one fixed
a pair of fixed contact pieces; a groove formed on the lower surface of the extending piece into which each free end of the fixed contact piece is fitted;
A hole is located between the grooves into which the free ends of the pair of fixed contact pieces are fitted, and is formed through the extending piece from above and below, and the pair of fixed contact pieces are arranged opposite to each other. A movable movable piece located between the extension pieces whose base end is electrically connected to and fixed to an external terminal fixed to the terminal block, and whose free end penetrates the hole and projects upward from the extension piece. An electromagnetic relay comprising a contact piece and an electrically insulating card that engages with the movable contact piece and each free end of the movable iron piece to connect them.