JPS61133526A - Electromagnetic relay - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention relates to an electromagnetic relay, in particular, to a movable platform that moves an iron piece toward and away from the end magnetic pole surface of an iron core based on excitation and demagnetization of a coil, and that holds this iron piece. This invention relates to an electromagnetic relay that opens and closes a contact mechanism via a relay.

[Summary of the Invention 1] The present invention forms a gap located on the core end side between the opposing surfaces of an iron core magnetic pole surface and an iron piece that approaches and separates in a direction orthogonal to the magnetic pole surface, and prevents the iron piece from coming into contact with the iron core magnetic pole surface. The contact surface is placed close to the point where the movable base drives the contact mechanism.

[Conventional technology 1 A conventional electromagnetic relay is shown in FIG. 7 through FIG.

The resin spool 1 has terminal support parts 1b at both ends of the body part 1a,
lc] d and 1e are integrally molded, one terminal support part 1c has one coil terminal 2, and the other terminal support part 1b has two coil terminals 3, 4, and 1
The book bearing members 5 are each fixed by insert molding. This spool 1 is assembled by fitting the protrusions if and If formed on the lower surfaces of the parts 1d and le into the holes 7c of the resin base 7 and thermally caulking the base 7.
is fixed in place. At that time, the yoke 8 is attached to the base 8a.
is positioned by the protrusion 1f, and the collar portion 1d
, 1e and the base 7. Moreover, the lower part 2a of the coil terminals 2 and 3.

3a protrudes downward from each hole 7a, 7b of the base 7.

A coil 9 wound around the body portion 1a of the coil spool 1
Both ends 9a, 9b of are soldered to the coil terminal 2.4, and the end 9b is connected to the coil terminal 3 via the resistor 6.

On the other hand, the iron core 10 is inserted into the body portion 1a of the coil spool 1, and one end portion 10a is press-fitted into the hole 8c of the upright piece 8b of the yoke 8 and fixed by caulking. The protruding end 10b, which is the other end of the iron core 10 and protrudes from the spool 1, is provided with magnetic shielding plates 16, 17 on both sides thereof, and is press-fitted into four parts 7e formed on the rib 7d of the base 7.

The movable block 11 includes a resin movable base 12 and a permanent magnet 13.
and iron pieces 14 and 15, and the iron pieces 14 and 15 are fixed to the movable table 12 with a permanent magnet 13 sandwiched therebetween.

This movable table 12 has an iron piece 14. i5 is installed so as to face both sides of the protruding end portion 10b of the iron core 10, and the iron piece 1
The upright piece 8d of the yoke 8 is located on the outside of the yoke 4. Further, on the side of the movable base 12, a shaft portion 12a and a protruding piece 12b are provided.
Ribs 12e are respectively provided protruding from the lower surface, the shaft portion 12a is slidably inserted into the guide hole 5a of the bearing member 5, and the ribs 12e, 12e are the upper surface 7 of the rib 7d of the base 7.
It is slidably located above f and 7f.

Three fixed terminals 18.19.20 are fixed to the base 7 by insert molding, passing through the base 7, and fixed contacts 21.2 are fixed to the two opposing fixed terminals 18.19.
2 is fixed, and the rear end of a movable contact piece 24 having a movable contact 23 at its tip is fixed in a cantilevered state to the other fixed terminal 20.

The movable contact piece 24 includes the projecting piece 12 of the movable base 12.
The groove portion 12d formed in b is engaged with the groove portion 12d.

Note that the cover 25 is fixed on the base 7, and the coil 9,
Cover parts such as contacts 21, 22, 23, etc.

In the electromagnetic relay configured as described above, when the coil 9 is not energized, an attractive force acts between the protruding end 10I of the iron core 10 and the iron piece 14 due to the magnetic force of the permanent magnet 13. As a result, the movable block 11 moves upward in FIG. 9 and to the left in FIG. 10, and the movable contact piece 24 is deflected at the driving point P, so that the movable contact 23 closes the fixed contact 21.

On the other hand, when the coil 9 is excited, the protruding end 1 (
A suction force acts between the iron piece 14 and the iron piece 15.
A repulsive force acts between them, and the movable block 11 moves downward in FIG. 1 (to the right in FIG. 10), and the movable contact 23 closes the other fixed contact 22.

(Problems to be Solved by the Invention) In the above electromagnetic relay, the reciprocating movement of the movable block 11 is caused by the engagement between the shaft portion 12a and the guide hole 5a and the base 7
This is done by engagement between the notch 7h formed in the barrier 7g and the neck 12c of the movable base 12, and an appropriate clearance is set between them so that the guiding can be performed smoothly. However, there is a problem in that the movable block 11 moves by the amount of these clearances, and the operating characteristics change.

This point will be explained in detail with reference to FIGS. 11 and 12. FIG. 11 illustrates the operating state of the electromagnetic relay, in which an attractive force Fm is acting between the iron piece 14 and the protruding end 101 of the iron core 10. Further, a reaction force Pc acts on the driving point P of the movable contact piece 24.

These two forces are opposite in direction and have a relationship of Fm>Fc, and since the points of action are shifted, a rotational moment is generated.

By the way, the length of the contact points 0 to Q of the iron piece 14 with respect to the iron core 10 is β1, and the length from the point O to the center of the suction force Fm is 1!
2, when the relationship p2.Fm<1+.Pc holds, point Q moves away from iron core 10, and movable block 11 rotates counterclockwise in FIG. 12 around point ○. This rotation is restricted at the point where the clearance between the shaft portion 12b and the guide hole 5a and between the neck portion 12c and the notch 7h becomes zero, and the driving point P moves to P'. This means that the amount of deflection of the movable contact piece 24 decreases by 1 in Δ.

On the other hand, when returning, the movable block 11 rotates clockwise in the same manner as described above, and the amount of deflection of the movable contact piece 24 decreases from the designed value. Such movement of the driving point P causes a decrease in the operating voltage and a decrease in the return voltage, resulting in variations in the operating characteristics and a lack of contact reliability.

One possible solution to the above problem is to make the clearance as small as possible, but considering the variation in dimensional accuracy during parts processing, it is actually impossible to make it any smaller than it is now. It is also not a good idea from a cost standpoint.

[Means for Solving the Problems 1] Therefore, the electromagnetic relay according to the present invention is characterized in that a gap is formed on the opposing surface of the iron piece and the iron core magnetic pole face on the iron core end side. In comparison with the prior art described above, the attraction surface between the iron core and the iron piece is reduced to the side of the contact driving point of the movable base. That is, as shown in Fig. 2, the iron core and the iron piece face each other along the length of points 0-Q, but a gap is formed between points O and 0, and they come into contact only between points O and Q. The center of the suction force Pi is brought close to the driving point P.

[Operation] In the configuration below, the permeance between points o and o' decreases due to the gap, and the permeance between points O'' and Q increases. Further, the fulcrum around which the movable table rotates is O゛. Therefore, the center of the suction force Fm is close to the driving point P, and the amount of displacement of the movable table rotating around the fulcrum O is small, which is significantly reduced compared to the conventional displacement Δρ1. are doing.

[Example] Hereinafter, each example of the present invention will be described with reference to FIGS. 1 to 6. The explanation of each embodiment will be limited to the parts related to the present invention, and the other structures e and l operations will be explained in Section 7.
This is the same as the conventional one shown in the figures through FIG. 11, and the same parts are denoted by the same reference numerals and the explanation thereof will be omitted.

In this first embodiment, notches 10d, 1 (le) are formed on both sides of the protruding end 101 of the iron core 10, and points 0 to O
An air gap 30.31 is provided in the iron core 1.
0. Iron piece 14. ．． 15 makes contact only between points O'' and Q.

The force relationship between the attraction force Fm and the reaction force Fc is as shown in FIG. Both the reaction force Fc and the attraction force Fm by the movable contact piece 24 generate a rotational moment in the counterclockwise direction around the fulcrum O', and the driving point P of the movable base 12 moves to P', but the deflection of the movable contact piece 24 The displacement amount ΔC2 that reduces the amount (contact point) Olow is greatly reduced compared to the conventional displacement amount Δρ1. Therefore, the operating characteristics are stabilized and the rotation moment (Fc-n 4) is reduced, so that the frictional force at the positioning portion of the movable base 12, that is, the id hole 5a and the notch 7h is also reduced.

Specifically, as shown in Fig. 2, point 0 during operation
The permeance between .about.O1 is reduced by the presence of the air gap 30.31, and the magnetic flux is concentrated between points O'' and Q.

Therefore, the center of the suction force Fm approaches the driving point P, and the rotational moment) (Fn+-, e3) also decreases. Therefore, if the notches 10d and 10e of the iron core 10 are made deeper, most of the magnetic flux will be concentrated between points O゛ and Q, and ρ
3 will further decrease, and the rotational moment (Fm
The J-resistance is reduced and the operating characteristics are further improved.

In addition, because the magnetic flux density between points O~Q becomes higher, the attractive force (holding force) during the squeezing operation increases, and the resistance to external vibrations and shocks improves. Since the magnetic flux is concentrated, the change in attraction force due to excitation to the coil 9 is also extraordinary, and the contacts can be driven with a small excitation force, achieving high sensitivity. On the other hand, in a state during operation in which the dimensions between the iron pieces 14, 15 and the iron core 10 are equal, the permeance between the iron pieces 14, 15 and the iron core 10 decreases, and the suction force becomes smaller. This means that the suction force curve can be controlled by the depth of the notches 10d and 10e.

In this second embodiment, notches 14a and 15b are formed on the opposing surfaces of the iron pieces 14..15 to form the protruding end 101 of the iron core 10.
An air gap 30.31 is provided between the two.

Bamboo-β-χ Example (See Figure 14) In this third example, the magnetic shielding plates 16 and 17 provided on both sides of the protruding end portion 10b of the iron core 10 are cut in the middle, so to speak, to form an air gap 30. 31.

First Embodiment (Refer to the first list) In this fourth embodiment, gently tapered surfaces 10f and 10g are formed on both sides of the protruding end 101 of the iron core 10, and the iron piece 14.
An air gap 3 (1, 31) is provided between 15 and 15.

1-5-Example (-10-Zukkimachi) In this fifth example, contrary to the fourth example, the iron piece 14
．． ．． 15 has a gently tapered surface 14b on the opposite surface.

15I] and an air gap 3 (1, 31) is provided at the opening with the protruding end portion 10b of the iron core 10.

[Effect of the invention 1] As is clear from the above explanation, according to the present invention, since a gap is formed on the opposing surface of the iron piece and the iron core magnetic pole face and on the iron core end side, the attraction surface between the iron core and the iron piece is movable. The stand is reduced toward the contact driving point side, and the center of the suction force Fm moves toward the contact driving point side. Therefore, the rotational moment Fm-n, , Fc-
f! 4 is reduced, and the displacement Δe2 of the contact driving point P is reduced to 11, which is greater than the conventional Δρ1. This prevents excessive increases and decreases in the operating voltage and release voltage, and reduces variations in operating characteristics. At the same time, contact reliability is improved. Further, since the clearance of the side portion of the movable table is the same as that of the conventional one, there is no need to particularly improve the dimensional accuracy when machining parts, and there is no increase in costs. Furthermore, the reduction in rotational moment reduces friction at the guy V portion of the movable table, resulting in a longer service life.

[Brief explanation of drawings]

Fig. 1 is a plan view of the first embodiment, Fig. 2 is an explanatory diagram of its attraction force characteristics, Fig. 3 is a plan view of the second embodiment, and Fig. 4 is a plan view of the third embodiment.
FIG. 5 is a plan view of the fourth embodiment, and FIG. 6 is a plan view of the fifth embodiment. Figure 7 and subsequent figures show a conventional electromagnetic relay, where Figure 7 is an exploded perspective view, Figure 8 is its basic configuration, Figure 9 is a plan view with the cover cut away, Figure 10 is a vertical sectional view, and Figure 11 is a cross-sectional view. The figure is a plan view during operation, and FIG. 12 is an explanatory diagram of attraction force characteristics. 1... Spool, 9... Coil, 10... Iron core,
] (lb-protruding end, 10d, 10e-notch, 10
f. ]OP,...Tapered surface, 11...Movable block, 1
2...Movable base, 13...Permanent magnet, 14. ．． 15.
...Iron piece, 14a, 15a...notch,] 41],
1511... Tapered surface, 21.22... Constant contact,
23... Movable contact, 24... Movable contact piece, :H),
31...Air gap. Patent applicant Tateishi Deniso Co., Ltd. Reisha agent Patent attorney Ao 111 Ao and 2 others = 12
−! -・ Day Fa > 1 0 (%J 107 dimensions -00 ~

Claims (1)

[Claims] (1) One end of an iron core inserted through the axis of a spool around which a coil is wound is made to protrude from the end of the spool, and a pair of iron pieces fixed to a movable table with a permanent magnet sandwiched therebetween is attached to the protruding end of the iron core. The movable base and the movable contact piece of the contact mechanism are connected on the coil side from the adsorption surface of the iron core magnetic pole surface and the iron piece, and the iron piece and the movable table are connected to each other on the coil side based on the excitation/demagnetization of the coil. An electromagnetic relay in which a movable base is driven in a direction orthogonal to a magnetic pole surface to open and close a contact mechanism, characterized in that a gap is formed on the opposing surface of the iron piece and the iron core magnetic pole surface on the iron core end side. .