JP3391810B2 - Polarized relay - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called balanced armature type polar relay in which an armature swings in a seesaw motion to switch contacts. 2. Description of the Related Art As this type of polarized relay, as shown in FIG. 4, a coil 3 is wound around a central piece of a substantially U-shaped iron core 1 opening upward, and both sides of the iron core 1 are formed. Permanent magnet 4 between pieces 1a
The electromagnet block 14 formed by interposing the
), A body block 11 formed by molding the electromagnet block 14 with a synthetic resin, and a seesaw centered on the permanent magnet 4 with both ends opposed to the upper end surfaces of both side pieces 1 a of the iron core 1. An armature block 12 formed by juxtaposing a contact spring 6 to which a movable contact 8 that comes into contact with and separates from a fixed contact 9 embedded in a body block 11 is provided on a side portion of the armature 5 that is movably attached. The armature block 12 is a so-called balance armature type in which the contacts 8 and 9 are opened and closed by swinging the armature block 12 in a seesaw manner. In this type of polarized relay, a contact spring 6 is generally bent (twisted) in an assembled state in which an armature block 12 is connected to a body block 11. Thus, a method of adjusting the spring load and increasing the yield rate is adopted. However, in the polarized relay having the structure in which the armature block 12 is mounted on the body block 11 as described above, it is difficult to secure a space for an adjustment jig for adjusting the contact spring 6. Therefore, conventionally, the contact spring 6 is bent before the armature block 12 is connected to the body block 11, so that a design spring load is obtained. However, in this case, if the spring load is changed when the armature block 12 is connected to the body block 11, the spring load cannot be adjusted after the armature block 12 is connected. There is a problem that the polarized relay becomes a defective product and the non-defective product ratio is lowered. [0004] The present invention has been made in view of the above points, and an object of the present invention is to provide a polarized relay that can increase the yield rate. According to the present invention, in order to achieve the above-mentioned object, in order to achieve the above-mentioned object , a flange is provided between both ends of a coil bobbin having a center piece of a substantially U-shaped iron core having flanges at both ends. An electromagnet block formed by interposing permanent magnets between both side pieces of the iron core exposed from both flange portions of the coil bobbin ,
The body in which this electromagnet block is molded and housed in synthetic resin, and the side of the armature that is mounted on the permanent magnet so that the seesaw can move freely with the central part as the fulcrum with both ends facing the tip surfaces of both sides of the iron core consists of a armature block formed by features a contact spring toward and away from the movable contact is secured to the fixed contact provided on the body, the electromagnet block
Fixed contact when molding
The formed part is placed on the part via a flange with a mold.
Positioning projections are formed on the collar to hold
And where the positioning projection of the flange is formed
A rib is formed on the side opposite to
The ribs are crushed and the dimensions of the coil bobbin
It has a structure that absorbs flutter, and has a recess formed in the body to provide a space for an adjustment jig that adjusts the spring load by bending the contact spring. According to the present invention, the armature block is formed on the body block by forming a recess in the body to provide a space for an adjustment jig for adjusting the spring load by bending the contact spring. Even after the connection, the contact spring can be bent through the recess to adjust the spring load. Therefore, the spring load can be adjusted in a state as close as possible to the finished product, and the yield rate is increased. Moreover, the electromagnet block is molded
Part where fixed contacts are formed when integrally formed with the body
Position is placed and held by a mold with the above part sandwiched through the flange
A positioning projection is formed on the collar part for
On the side opposite to the position where the positioning protrusion of the flange is formed.
Li Bed is formed at a position collapsed in the mold I, the
Ribs collapse to absorb dimensional variations in coil bobbins
Dimensional variation of the coil bobbin
Can be absorbed. Also, the electromagnet block
Mold with synthetic resin to form the body, and at least
The contact spring by the adjustment jig.
The adjustment jig does not touch the coil during bending adjustment.
No damage to the coil. FIG. 1 to FIG. 3 show an embodiment of the present invention. In the polarized relay according to the present embodiment, as shown in FIG. 3, an iron core 1 is formed in a substantially U-shape, and the iron core 1 is arranged with both side pieces facing upward. A coil bobbin 2 made of synthetic resin is integrally formed with the iron core 1. That is, the iron core 1 is the coil bobbin 2
Insert molding. Here, the tip portions of both side pieces 1 a that become the magnetic poles of the iron core 1 are exposed from the flange 2 a of the coil bobbin 2. A coil 3 is provided on the body of the coil bobbin 2.
Is wound. A connection piece 21 for connecting both ends of the coil 3 and a fixing piece 22 integrated with the connection piece 21 are implanted in each of the flanges 2a formed on both ends of the coil bobbin 2. In addition, positioning protrusions 23 project from both sides of the iron core 1 on the upper surface of the flange portion 2a. Then, a rectangular parallelepiped permanent magnet 4 is attached between both side pieces 1a exposed from the coil bobbin 2 of the iron core 1.
The permanent magnet 4 is magnetized with different polarities at the center and both ends. The manufacturing process of each of the above members will be described. First, a coil bobbin 2 is manufactured by inserting an iron core 1 therein.
A coil 3 is wound around the coil bobbin 2 and then a permanent magnet 4 is attached to form a shape shown in FIG. In the following description, a member including the iron core 1, the coil bobbin 2, the coil 3, and the permanent magnet 4 is referred to as an electromagnet block 14.
Call. The electromagnet block 14 is molded with a synthetic resin together with the terminals 7 to be integrally formed as the body block 11 shown in FIG. The terminal 7, and the fixed contact terminal ₇₁ to the fixed contact 9 to the base end is formed, the common contact terminal 7 the hinge spring pieces 6a of the contact spring 6 is fixed piece 7a which is fixed are formed to be described later to the proximal end _2, a coil terminal 7 ₃ for performing energization of the coil 3, the electromagnet block 14
On either side of, the two fixed contact terminals _71, one common contact terminals 7 ₂ and two coil terminals 7 ₃ are respectively implanted. Here, the base end portion of the coil terminal 7 ₃ are connected by welding to the fixing pieces 22 implanted in the flange portion 2a of the coil bobbin 2. By the way, as described above, the body block 1
When forming 1, the position of the fixed contact 9 may fluctuate due to the molding pressure applied to the terminal 7 during molding. Therefore, it is necessary to form the body block 11 while firmly holding the fixed contact 9 portion. Conventionally, in order to position the fixed contact 9 part, the fixed contact 9 part was directly positioned by a mold. However, as in the present embodiment, the electromagnet block 1
When the so-called simultaneous molding process of integrally molding the terminal 4 and the terminal 7 with a synthetic resin is performed, since the electromagnet block 14 is integrally molded, it is not possible to provide a space for holding a mold for holding the fixed contact 9 portion. . Therefore, in this embodiment, the positioning of the fixed contact 9 during molding is performed as follows. When mold and the electromagnet block 14 and the terminal 7 of a synthetic resin, is placed a base fixed contacts 9 fixed on the positioning projection 23 formed on the flange portion 2a of the coil bobbin 2 contact terminal ₇₁ is formed Then, the base where the fixed contact 9 is formed is held by a mold via the flange 2a. By doing so, the position of the fixed contact 9 does not fluctuate due to the molding pressure. [0012] However, the poor dimensional accuracy of the coil bobbin 2 in this case, may not fully hold the fixed contact terminals _71, contrary to size too large, there is a fear that the coil bobbin 2 itself is broken. Therefore, in the present embodiment, a rib 24 is formed on the lower surface of the flange 2a of the coil bobbin 2, and the rib 24 absorbs the dimensional variation of the coil bobbin 2. That is, the fixed contact terminal 7 in the vertical dimension of the flange portion 2a of the coil bobbin 2 comprising ribs 24 ₁
The slightly larger form than positioned, fixed contact terminals ₇₁ during molding of the body block 11 and the coil bobbin 2
The ribs 24 are crushed by an extra dimension after the positioning projections 23 of the flanges 2a come into contact with each other to absorb dimensional variations of the coil bobbin 2. In this case, it is necessary to form the positioning projections 23 so that the ribs 24 are not crushed and crushed.
Thus, the fixed contact terminal ₇₁ can be completely positioned, it is possible to prevent the coil bobbin 2 is destroyed. [0013] Here, the common contact terminals 7 ₂ may be positioned in a mold as in the prior art, the terminals 7 are molded in the state of FIG. 3 (b). Incidentally, the fixation piece 7a of the common contact terminals 7 ₂ upper surface is molded so as to expose from the body block 11. Then, after the formation, the portions exposed from the molded portions of the respective terminals 7 are bent downward. As described above, when the iron core 1, the permanent magnet 4, and the fixed contact 9 are integrally formed as a body block 11, a swinging surface on which an armature block 12 described later is swingably mounted, and both side pieces 1a of the iron core 1 are formed. The position accuracy of the magnetic pole surface, which is the upper surface, and the position of the fixed contact 9 can be increased. That is, when the members are individually assembled and formed, the positions of the rocking surface, the magnetic pole surface, and the fixed contact 9 vary due to the variation in the assembly state of each member. Body block 11
And the fixed contact 9
Can be easily increased in position accuracy. Therefore, the quality of the product is stabilized. An armature 5 is disposed on the permanent magnet 4 of the body block 11. The armature 5 is formed in the shape of a flat plate, and swings on the permanent magnet 4 as shown in FIG. 2B using a ridge 5a formed at the center of the lower surface as a swing fulcrum as shown in FIG. It is placed freely (seesaw movement). A contact spring 6 is integrally attached to the armature 5. In the case of this embodiment, since it is a two-circuit type polarized relay,
Two contact springs 6 are provided on both sides of the armature 5. A movable contact 8 is fixed to each of both ends of the contact spring 6, and a hinge spring piece 6a protrudes from one side of a central portion. The hinge spring piece 6a is fixed to the fixing piece 7a of the common contact terminal 7 _2, thereby the contact spring 6 is electrically connected to the common contact terminal 7 _2. In addition, this hinge spring piece 6a
The torsion generated when the armature 5 is attracted to one of the side pieces of the iron core 1 also has a function of giving a restoring force to the armature 5. In this embodiment, the armature 5 and the contact spring 6 are molded with a synthetic resin to form an armature block 12 integrally. The armature 5 and the contact spring 6 are insulated from each other by the molded portion 12a. In this way, it is possible to prevent the insulation distance between the contact spring 6 and the coil 3 via the armature 5 from being substantially reduced in the molding portion 12a, and to prevent the molding member of the body block 11 from being shortened. Since the coil 3 is buried in the inside, the insulation between the contact spring 6 and the coil 3 is provided even with the molded member of the body block 11, so that the input / output withstand voltage can be sufficiently ensured. By the way, in the polarized relay of the present embodiment, as shown in FIG. 3A, the base end of the hinge spring piece 6a is extended from the position shifted from the center position of the armature block 12, and common contact terminal 7 _{and second} fixing piece 7a at the center position of the armature block 12 the tip of the spring pieces 6a
It is stuck to. Thus, the spring load of the hinge spring piece 6a becomes unbalanced at the center of the armature block 12, and the spring force of the hinge spring piece 6a attracts the armature 5 by the permanent magnet 4 to the magnetic pole surface of the iron core 1. If the magnetomotive force is larger than the magnetomotive force to be applied, the armature 5 can be returned to a constant state against the attraction force between the armature 5 by the permanent magnet 4 and the magnetic pole surface of the iron core 1. Therefore, the polarized relay operates monostable. In the case of a polarized relay having such a structure, there is a problem that the spring load cannot be adjusted by bending the contact spring 6 after attaching the armature block 12 to the body block 11. Therefore, in the present embodiment, the concave grooves 11a are formed in the width direction corresponding to the portions where the contact springs 6 on both sides of the body block 11 protrude from the molded portion 12a. The concave groove 11a is formed in a size that can secure a space for the adjustment jig. By providing the concave groove 11a in this manner, the spring load can be adjusted after the armature block 12 is connected to the body block 11, that is, the spring load can be adjusted in a state closer to a completed product than before, Since it is not necessary to consider the characteristic fluctuation in the joining step of joining the armature block 12 to the body block 11, the yield rate is increased. If the electromagnet block 14 is formed simultaneously with the body block 11 and the coil 3 is buried in the molding material forming the body block 11 as in the polarized relay of the present embodiment, the coil 3 is exposed. Therefore, when the bending of the contact spring 6 is adjusted by the adjusting jig, the coil 3 is not damaged. When this type of polarized relay is miniaturized, the magnetic pole surface (the upper end surface of the side piece of the iron core 1) and the contact portion (the portion where the movable contact 8 and the fixed contact 9 are formed) are close to each other. Therefore, it is conceivable that the open / close friction powder generated on the magnetic pole surface and the contact portion is scattered and a contact failure occurs on each of the magnetic pole surface and the contact portion. Therefore, in order to improve this point, a groove 11b may be formed between the magnetic pole surface and the contact portion. With this configuration, the creepage distance between the magnetic pole surface and the contact portion can be increased by the groove 11b, and the friction powder can be stored in the groove 11b, and the opening and closing friction generated between the magnetic pole surface and the contact portion can be increased. It is possible to reduce the possibility of poor contact caused by the powder on each of the magnetic pole surface and the contact portion. With the armature block 12 placed and mounted on the permanent magnet 4 of the body block 11 as described above, the cover 13 shown in FIG. 1 is fitted. This cover 13
Has a box shape with an open lower surface, and a sealing portion 13a for sealing the inside is formed at one corner of the upper surface. The operation of the polarized relay of the above embodiment will be briefly described. In this polarized relay, in the stationary state in which the energization of the coil 3 is stopped, the end of the armature 5 on the side opposite to the side where the extension position of the hinge spring piece 6a is shifted by the magnetomotive force of the permanent magnet 4 is an iron core. 1
Is attracted to the magnetic pole surface. When the coil 3 is energized so that the end on the side where the armature 5 is not attracted is attracted to the magnetic pole surface of the iron core 1, the end of the armature 5 is attracted to the iron core 1. The armature block 12 swings and the armature 5 becomes the side piece 1 of the iron core 1.
a. At this time, the movable contact 8 at one end of the contact spring 6 comes into contact with the fixed contact 9. This state is maintained while the coil 3 is energized. When the energization of the coil 3 is stopped,
With the spring force of the hinge spring piece 6a described above, the armature 5 is returned to a fixed state and rotated against the attraction force between the armature 5 by the permanent magnet 4 and the magnetic pole surface of the iron core 1. Although the above description has been given of the case of the monostable type, the present invention is also applicable to the case of the bistable type. Here, when the polarized relay is a bistable type, the extension position of the hinge spring piece 6a may be set to the center of the armature block 12. As described above, the present invention has flanges at both ends.
Of the coil bobbin with the central piece of
Wrap the coil between the flanges and expose the coil bobbin from both flanges.
An electromagnet block formed by interposing permanent magnets between both sides of the presented iron core, and this electromagnet block is made of synthetic resin.
Fixing provided on the body on the body that is molded and stored, and on the side of the armature that is mounted on the permanent magnet with the center part as a fulcrum with the both ends facing the tip surfaces of both sides of the iron core so that the seesaw can move freely It consists of an armature block formed with a contact spring with a movable contact fixed to and separated from the contact, and is molded integrally with the body by molding the electromagnet block.
When forming, the part where the fixed contact was formed is placed and
Positioning for holding the part through the flange
A projection is formed on the flange, and positioning of the flange is performed.
Crush the mold on the side opposite to the place where the protrusion is formed
Ribs are formed at the locations where
It has a structure that absorbs the dimensional variation of the rubobin, and a recess is formed in the body to provide a space for an adjustment jig to adjust the spring load by bending the contact spring, so the armature block is attached to the body block. After the connection, the spring load can be adjusted by bending the contact spring through the concave portion, so that the spring load can be adjusted in a state as close as possible to the finished product, and the yield rate can be increased. In addition, the electromagnet block is molded and
When forming on the body, the part where the fixed contact was formed is placed
A position for holding the above-mentioned part through the flange with a mold
The positioning protrusion is formed on the flange, and the position of the flange is determined.
The mold opposite to the place where the positioning projection is formed and
Ribs are formed where they are crushed, and the ribs
Structure to absorb dimensional variations of coil bobbins
To absorb the dimensional variation of the coil bobbin
be able to. Also, the electromagnet block is made of synthetic resin
To form a body and at least the coil inside the body
When the contact spring is adjusted by the adjustment jig
The adjustment jig does not touch the coil,
Does not scratch.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of one embodiment of the present invention. 2 (a) and 2 (b) are a cross-sectional view and a vertical cross-sectional view of the same after assembly. FIG. 3 is an explanatory diagram of a manufacturing process of the above body block. FIG. 4 is an exploded perspective view of a conventional example. [Description of Signs] 1 Iron core 1a Side piece 3 Coil 4 Permanent magnet 5 Armature 6 Contact spring 8 Movable contact 9 Fixed contact 11 Body block 11a Groove groove 12 Armature block 14 Electromagnet block

Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01H 50/00-51/36

Claims (1)

(57) a coil wound between the flange portion of the coil bobbin which is inserted into the central piece [Claims 1. A substantially U-shaped core has a flange portion at both ends, both of the coil bobbin An electromagnet block formed by interposing permanent magnets between both side pieces of the iron core exposed from the flange ,
The body in which this electromagnet block is molded and housed in a synthetic resin, and the side of the armature that is mounted on the permanent magnet so that the seesaw can move freely with the central part as the fulcrum with both ends facing the tip surfaces of both side pieces of the iron core consists of a armature block formed by features a contact spring toward and away from the movable contact is secured to the fixed contact provided on the body, the electromagnet block
Fixed contact when molding
The formed part is placed on the part via a flange with a mold.
Positioning projections are formed on the collar to hold
And where the positioning projection of the flange is formed
A rib is formed on the side opposite to
The ribs are crushed and the dimensions of the coil bobbin
A polarized relay having a structure for absorbing fluttering and having a concave portion provided in a body for providing a space for an adjustment jig for adjusting a spring load by bending a contact spring .