JPH0676720A - Structure of relay - Google Patents

Abstract

PURPOSE:To prevent the thermal deformation of a contact spring block at a high temperature and at the same time to prevent the deterioration of its operational characteristics by increasing the strength of a contact spring supporter. CONSTITUTION:A pair of contact springs 25 capable of being brought into contact with and being released from a stationary contact part and contact spring supporters 26 having a laterally U-shaped cross-section, each of which is provided in a row in the middle part of the respective contact springs 25, are composed into one body by means of a conductive metal body A. The projecting part 26a of the contact spring supporters 26 is fitted into the base 15 of an armature block 14. The characteristic change of the metal-made contact spring supporters 26 becomes extremely low with the temperature change. Even when the contact spring 25 is left loaded at a high temperature and heated at the time of being soldered, thermal creeping is not brought about in the contact spring supporters 26. The change of the operational characteristics of a relay is limited to a small range by eliminating the thermal deformation of a contact spring block 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a relay for switching contacts using a contact spring.

[0002]

2. Description of the Related Art Conventionally, the structure of this type of relay has been
Contact spring block 18 'as shown in FIGS. 5 (a) and 5 (b).
There is one that switches contacts using. The contact spring block 18 'includes a pair of thin plate-shaped contact springs 25',
The contact springs 25 'are brought into contact with and separated from the fixed contact portion 10a to perform contact switching. Each of the contact springs 25 'is attached to the pair of molded support pieces 27, 28 so as to be inserted therein, and the molded support pieces 27, 28 are integrally molded with the fixing portion 26 by a resin molded product.

[0003]

In the structure of such a relay, when the contact spring 25 'is left under a high temperature with a load applied, the mounting portions of the molding support pieces 27, 28 to which the contact spring 25' is attached. Stress is concentrated near 27a and 28b, and thermal creep due to temperature stress may occur in this vicinity, causing deformation of the molding support pieces 27 and 28. In this case, there is a problem that the spring load of the contact spring 25 'changes and the operating characteristics of the relay fluctuate.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to increase the strength of the contact spring supporting piece to prevent thermal deformation of the contact spring block against a high temperature and to operate. It is an object of the present invention to provide a relay structure capable of preventing deterioration of characteristics.

[0005]

In order to solve the above problems, the present invention mounts a contact spring block 18 on an armature block 14 driven by an electromagnet device 2 and attaches the contact spring block 18 to a fixed contact portion 10a. In the structure of a relay that switches contacts by making contact and separation, the contact spring block 18 is made of a conductive metal body, and the conductive metal body is made of a pair of contact springs 25 that are movable to and from the fixed contact portion 10a. And a contact spring support piece 26 having a U-shaped cross section and protruding from an intermediate portion of each contact spring 25 and fitted into the base body 15 of the armature block 14.

[0006]

According to the present invention, the contact spring supporting piece 26 is constituted by the conductive metal body A which is integrated with the contact spring 25, and the contact spring supporting piece 26 is formed in a U-shaped cross section, and its protruding portion is formed. Since 26a is fitted to the base body 15 of the armature block 14, the metal contact spring support piece 26 is significantly strengthened, unlike the case where a conventional synthetic resin support piece is used. As a result, the change in the characteristics of the contact spring support piece 26 with respect to the temperature change becomes extremely low, and even if the contact spring 25 is left under a high temperature with a load applied, or even when high heat is applied during soldering, the contact Spring support piece 2
No thermal creep occurs in 6 and contact spring block 1
It is possible to reduce the thermal deformation of No. 8 and suppress the fluctuation of the operating characteristics.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In FIG. 2, the relay housing 1 is composed of a box-shaped body 1a having an open top surface and a cover 1b to which the body 1a is fitted. A yoke 3 and an electromagnet device 2 are housed in the center of the body 1a, and contact blocks 4 are housed on both sides. The yoke 3 is provided with two sets of substantially U-shaped ones opening upward, and is housed in the body 1a in such a manner that the end portions of the iron cores 5 are interposed at intervals between the side pieces of the yokes 3. It is designed to be used. The electromagnet device 2 is composed of an iron core 5, a coil bobbin 6 simultaneously formed on the iron core 5, and a coil 7 wound around the coil bobbin 6. Here, the coil bobbins 6 are simultaneously formed on the iron core 5 so as to expose both ends of the iron core 5, and the coil terminals 8 are respectively planted at four positions of the collars formed on both sides of the coil bobbin 1. The end of the coil 7 is connected to each coil terminal 8.

The contact block 4 has a fixed terminal 10 and
It is composed of a metal base 9 to which the fixed terminal 10 is attached, and a shield plate 11 for shielding an upper end portion 10a (hereinafter, the upper end portion is referred to as a fixed contact portion) which is a fixed contact portion of the fixed terminal 10. . The fixed terminal 10 has an insulator 12 fixed to the central portion thereof, and the portion where the insulator 12 is formed is mounted in the mounting hole 9a of the metal base 9 to be mounted on the metal base 9. A plurality of ground terminals 13 are attached to the metal base 9. The shield plate 11 is
A protruding strip 9b protruding from the upper surface of the metal base 9 is inserted into an insertion hole 11b formed in a U-shape that opens upward when viewed from the side, and the tip of this protruding strip 9b is inserted. It is fixed to the metal base 9 by caulking.

An armature block 14 is attached to the upper portion of the electromagnet device 2. This armature block 1
4 is mounted on the electromagnet device 2 in such a manner that a pair of armatures 16 is interposed between the iron core 5 and the yoke 3, and a contact spring 25 is interposed in the shield plate 11 of the contact block 4. A base 15 made of an insulating material, and a pair of armatures 16 attached to both ends of the base 15, respectively.
And a permanent magnet 17 interposed between the pair of armatures 16,
Contact spring blocks 1 attached to both sides of the base 15.
8 and an equilibrium spring 19 that holds the armature block 14 on the electromagnet device 2 so as to be movable in parallel in the horizontal direction and applies a restoring force to the armature block 14. The balance spring 19 is attached to a support member 24 made of an insulating material, which is inserted into an insertion groove 23 formed in one side wall in the longitudinal direction of the body 1a, and side piece portions 19a located on both sides of the base 15. And a bridging portion 19b bridging the tip portions of the respective side piece portions 19a, and the base portion of the side piece portion 19a is caulked and fixed to the support member 24. The convex ribs 21 of the base 15 are welded to the bridging portion 19b to form the base 1
An insertion hole 19c for attaching 5 to the balance spring 19 is formed. On the other hand, the base body 15 of the armature block 14 is formed with storage holes 20 for accommodating the armature 16 and the permanent magnets 17 at both ends thereof, and the armature 16 formed in a substantially T shape has its lower end located below the base body 15. It is attached in a hanging form.
Further, the permanent magnets 17 attached to both ends of the base 15 have different magnetizing directions, so that the pair of armatures 16 attached to both ends of the base 15 have opposite polarities. Two columnar convex ribs 21 are formed in the center of the base body 15, and the base body 15 is attached to the balance spring 19 using the convex ribs 21. The central portion of the base 15 is formed wide, and the fitting holes 2 for mounting the contact spring blocks 18 at the four corners of the wide portion.
2 are formed respectively.

The contact spring block 18 is shown in FIG.
As shown in (b), impedance matching (75
A pair of thin plate-shaped contact springs 25 each having a notch having a structure for achieving Ω or 50 Ω), and a contact spring support piece 26 having a U-shaped cross section and continuously connected to an intermediate portion of each contact spring 25. It is composed of a conductive metal body A. As shown in FIGS. 4A and 4B, the protrusions 26 a of the contact spring support pieces 26 have the fitting holes 2 provided at the four corners of the base body 15.
2 are fitted individually. The metal contact spring support piece 26 is formed in a U-shape slightly wider than the fitting hole 22 having the square cross section, and the protrusion 26a of the contact spring support piece 26 is inserted in the fitting hole 22. By elastically pushing in and adhering with an adhesive, the contact spring supporting piece 26 is attached to the base 1
5 can be firmly attached. The center fixed contact portion 10a of the contact block 4 shown in FIG. 2 is located between the pair of contact springs 25 with the contact spring support pieces 26 attached to the fitting holes 22 of the base 15. At the same time, the fixed contact portions 10a on both sides are located on one side of each contact spring 25.

Here, as shown in FIG. 1, the contact spring supporting piece 26 is formed of a conductive metal body A which is integral with the contact spring 25, and the contact spring supporting piece 26 is formed in a U-shaped cross section. Therefore, unlike the case of using the conventional molded support piece made of synthetic resin, the contact spring support piece 26 itself is significantly strengthened. Thereby, the contact spring supporting piece 2
The characteristic change with respect to the temperature change of 6 becomes extremely low, and the contact spring 25 is left under a high temperature with a load applied,
Alternatively, even when high heat is applied during soldering, thermal creep does not occur in the contact spring support piece 26, the thermal deformation of the contact spring block 18 is reduced, and fluctuations in operating characteristics can be suppressed. Become. Further, in the present embodiment, since the cross-sectional shape of the contact spring support piece 26 is formed in a U-shape that is wider than the fitting hole 22 of the base 15, the spring force of the contact spring support piece 26 and the adhesive are used. Due to the adhesive force between the contact spring support piece 26 and the fitting hole 22, the fitting hole 2
There is an advantage that the attachment strength of the contact spring support piece 26 to the 2 can be further enhanced.

Next, the operating state of the relay will be described. First, when the coil 7 shown in FIG. 2 is energized, both ends of the iron core 5 are magnetized to have different polarities, and the armature 16 attracts the magnetic poles which are different from the magnetic poles at both ends of the iron core 5. Here, since the pair of armatures 16 on both ends of the base body 15 are magnetized in opposite polarities, one of the pair of armatures 16 on both ends on the same side in the width direction of the relay is attracted to the iron core 5. It Therefore, the base 15 moves in parallel in the width direction. When the armature 16 is attracted to the iron core 5, even if the coil 7 is de-energized, the magnetomotive force of the permanent magnet 17 causes the iron core 5 and the armature 16 to move.
The adsorbed state is maintained, and thus the movable state of the armature block 14 is also maintained. In this way, armature block 1
4 moves, the fixed contact portion 10a at the center of each contact spring block 18 and either of the fixed contact portions 10a on both sides.
Is short-circuited between. Further, in this state, when the energization direction to the coil 7 is reversed, both ends of the iron core 5 are magnetized with the opposite polarities to the above case, and the armature block 14 moves in parallel to the opposite side in the width direction of the relay. As a result, contact switching is performed in which the central fixed contact portion 10a and the other fixed contact portion 10a are short-circuited. Instead of reversing the energization direction to the coil 7 as described above, two sets of coils 7 are wound around the coil bobbin 6 with the winding directions reversed, and one of the coils 7 is energized. You may

[0013]

As described above, according to the present invention, the contact spring block is made of a conductive metal body, and the conductive metal body is provided with a pair of contact springs that can be contacted with and separated from the fixed contact portion, and each contact spring. Since it is composed of a contact spring supporting piece having a U-shaped cross section and protruding from the intermediate portion of the armature block and fitted to the base body of the armature block, In contrast, the contact spring support piece can be reinforced, and the contact spring block is less likely to be thermally deformed even if it is left in a high temperature with a load applied to the contact spring or heated during soldering. This has the effect of ensuring stable operation characteristics.

[Brief description of drawings]

FIG. 1 is a perspective view of a contact spring block used in an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a relay including the contact spring block of the above.

FIG. 3 (a) is a front view of the above contact spring, and FIG. 3 (b) is a plan view.

FIG. 4A is a plan sectional view of a contact spring supporting piece of the above contact spring, and FIG. 4B is a plan view showing a state where the above contact spring supporting piece is fitted in a fitting hole of a base body. .

FIG. 5A is a front view of a conventional contact spring block,
(B) is a plan view.

[Explanation of symbols]

 2 Electromagnet device 10a Fixed contact part 14 Armature block 15 Base 18 Contact spring block 25 Contact spring 26 Contact spring support piece 26a Projection A Conductive metal body

Claims (1)

[Claims] 1. In a structure of a relay in which a contact spring block is attached to an armature block driven by an electromagnet device, and the contact spring block is brought into contact with and separated from a fixed contact portion to switch the contact, the contact spring block is conductive. This conductive metal body comprises a pair of contact springs that can be brought into and out of contact with a fixed contact portion, and a cross-section core body that protrudes from the intermediate portion of each contact spring and is fitted to the base body of the armature block. A relay structure, characterized in that it is formed by connecting a letter-shaped contact spring supporting piece.