JPH0333046Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a terminal plate fixing device for securing a leader wire drawn out from an electromagnetic coil.

[Prior art]

Conventionally, in an electromagnet, a terminal plate that holds a lead wire of a coil wound around a coil bobbin has been used, for example.
As shown in FIG. 5, the lead wire 3 drawn out from the coil 2 is wound around the base end of the terminal plate 4 with a little margin and then connected by soldering. A fixed core 6 is inserted into which a guide tube 5 is welded, in which a movable core 8 that opens and closes the fluid passage of the valve body A is movably moved up and down by the electromagnetic force of the coil 2, and the fixed core 6 protrudes from the upper end of the coil bobbin 1. A U-shaped yoke 7 is fixed between the head of the coil 2 and the lower end of the coil bobbin 1 so as to surround the coil 2, and an electromagnet 9 is assembled.In this state, a clip (not shown) or the like is attached to the terminal plate 4. After clamping the electromagnet 9 and performing a coil resistance test, etc., the electromagnet 9 is housed in a mold (not shown), and a thermosetting resin such as epoxy resin is press-fitted and molded to give the outer surface a required thickness. The electromagnet 9 was manufactured by forming a resin insulating layer 10.
Note that 4a is a ground terminal connected to the yoke 7.

[Problems with the prior art] However, in the conventional electromagnet 9, the terminal plate 4 is connected to the coil 2.
Since it is simply connected to the lead wire 3 by soldering, after assembling the electromagnet 9, when performing various tests such as an interlayer insulation test or a coil resistance test, attach or detach a clip or the like to the terminal board 4 each time. However, since the terminal board 4 is connected to the leader wire 3 in a suspended state, when removing the clip from the terminal board 4, the test work is very time-consuming and troublesome. Accidents may occur, such as the leader wire 3 being accidentally pulled while being clamped to the plate 4, or the leader wire 3 being carelessly touched by another tool, etc., and the leader wire 3 being accidentally cut as described above. There was a drawback.

Furthermore, when the assembled electromagnet 9 is resin molded, the terminal plate 4 is only connected to the lead wire 3, so unless the terminal plate 4 is fixedly supported in the mold by some method, the resin will not be press-fitted. The terminal board 4 may be pulled back into the electromagnet 9 by the force generated when
On the other hand, the terminal board 4 may not be able to protrude from the resin insulating layer 10 with a predetermined dimension due to being pushed out.
Therefore, when this electromagnet 9 is used, there is a drawback that external wiring (not shown) connected to the terminal board 4 must be matched to the protruding size of the terminal board 4. For this reason, when making resin molds, the mold was manufactured in a structure that allowed the terminal board to be fixedly supported, and the terminal board was fixed and supported within the mold each time molding was performed, so when molding the electromagnet, This has the disadvantage that the preliminary work is time-consuming and the structure of the mold itself becomes complicated, which increases the production cost and inevitably increases the production cost of the electromagnet.

[Purpose of invention]

The present invention eliminates the above-mentioned drawbacks, and fixes and electrically insulates the terminal plate connected to the coil lead wire on the outside of the yoke of the electromagnet. To provide an electromagnetic terminal plate fixing device capable of maintaining a good connection relationship with a leader wire even if a large force is applied to the terminal plate from the outside.

[Summary of the idea]

In order to achieve the above object, the present invention has an insulating plate placed outside the yoke of an electromagnet, and a terminal mounting plate with a terminal plate fitted on the outside of the insulating plate, which is provided with a support protrusion on the yoke together with the insulating plate. and a ground terminal which is secured to the terminal mounting plate and press-fitted into the yoke to be supported in a manner that cannot be removed.

[Example of idea]

An example in which the present invention is applied to an electromagnet used in a solenoid valve will be explained below with reference to FIGS. 1 to 4 of the drawings.

In FIG. 1, 11 is a valve body having a fluid inlet 12 and an outlet 13, 14 is a fixed iron core 16 whose head is projected upward and is inserted halfway into the center hole of a coil bobbin 15, and this fixed iron core. A guide cylinder 17 is fitted onto the outer periphery of the coil bobbin 16 by means such as press fitting and inserted into the center hole of the coil bobbin 15, and a valve 18 is inserted into the guide cylinder 17 so as to be movable up and down and opens and closes the inlet 12 at the lower end. The movable iron core 19 provided
and a coil 20 wound around the coil bobbin 15,
An electromagnet consisting of a yoke 21 which is made of a rectangular frame formed by holding an iron plate divided into two in a U-shape from the outside of the coil 20 at the upper and lower ends of the coil bobbin 15,
The yoke 21 has an upper portion connected to the coil bobbin 15.
A metal wedge member 22 inserted between the lower part of the yoke 21 and the lower end of the coil bobbin 15 has a lower part held by the lower edge of the coil bobbin 15. Therefore, it is fixedly supported on the coil bobbin 15. Reference numeral 23 denotes a terminal plate of the electromagnet 14, which is attached to one side of the yoke 21 via a terminal plate fixing device 24. As shown in FIGS. 3 and 4, this terminal plate fixing device 24 consists of a support protrusion 2 protruding from the center of one side of the yoke 21.
A through hole 26 is inserted through the large diameter portion of the yoke 21, and a through hole 2 is formed below the support protrusion 25 of the yoke 21.
An insulating plate 29 is provided with a notch 28 for exposing the terminal board 23, and a notch hole 30 for engaging and holding the mounting leg of the terminal board 23 is cut out in the upper end of the side of the plate-shaped insulating member. From the center to the bottom is an inverted Y
It is constituted by a terminal mounting plate 33 having a fitting hole 31 punched out in the shape of a letter, and further provided with a notch 32 on the upper edge for passing the lead wire 20a of the coil 20. The terminal board 23 fixedly supported by the terminal board fixing device 24 has an external wiring connection terminal section a at one end.
has an insertion hole b for external wiring connection, and the mounting leg c at the other end has a winding part d cut and raised in the plate thickness direction, and a leg part c formed by cutting and raising this winding part d. Narrow engagement recesses e are provided in the upper and lower parts, respectively. Also, like the terminal board 23, the ground terminal 34 has an insertion hole b' for external wiring connection in the external wiring connection terminal part a', and the mounting leg c' is press-fitted into the through hole 27 of the yoke 21. The external wiring connection terminal a' of this leg c' has an engaging recess e' that engages with the wide part of the fitting hole 31 provided in the terminal mounting plate 33. will be established. In the figure, reference numeral 35 denotes a window hole 35 opened at the upper end of the side of the yoke 21 on the support protrusion 25 side, through which the lead wire 20a of the coil 20 is inserted into the insulating tube 36 and led out of the yoke 21. 19a is a spring that biases the movable iron core 19 toward the valve body 11 side.

Next, assembly of the electromagnet 14 will be explained.

First, the coil 20 is wound around the coil bobbin 15, and its lead wire 20a is wound and soldered around the terminal 37 supported on the upper flange of the coil bobbin 15, leaving a certain length. Next, coil bobbin 15
Fixed iron core 16 with a guide tube 17 vertically disposed in the center hole of
is inserted, leaving its head intact, and then a yoke 21 made of a pair of iron plates bent into a U-shape is held between the lower end of the coil bobbin 15 and the head of the fixed iron core 16 from the outside of the coil 20, and the wedge member 22 and the yoke 21 below the coil bobbin 15 to fix the yoke 21 to the coil bobbin 15. Next, the lead wire 20a wound around the terminal 37 is passed through the insulating tube 36 and pulled out from the yoke 21 through the window hole 35. In this state, position the insertion hole 26 of the insulating plate 29 at the large diameter part of the support protrusion 25 and insert the insulating plate 29.
9 is brought into contact with the side surface of the yoke 21 on the window hole 35 side.
Subsequently, the terminal plate 23 is fitted into the notch hole 30 of the terminal mounting plate 33. In this case, when the engagement recess e provided in the mounting leg c of the terminal plate 23 is aligned with the recess f provided at the upper and lower portions of the deepest part of the notch hole 30, the terminal plate 23 is inserted into the engagement recess. Projection g located outside e
is engaged with the edge of the recessed hole f and fitted into the notch hole 30 of the terminal mounting plate 33. Then, the terminal mounting plate 3
3 is arranged on the outside of the insulating plate 29, with the small diameter part of the support protrusion 25 sandwiched between the narrow part of the fitting hole 31 from the outside of the insulating plate 29, as shown in FIG.
When the engagement recess e' of the ground terminal 34 is engaged with the edge of the wide part of the fitting hole 31 of No. 3, and the leg c' of the ground terminal 34 is press-fitted into the through hole 27 of the yoke 21, the terminal mounting plate 33 is the support protrusion 25 and the ground terminal 3
4 and is attached to the side surface of the yoke 21 via an insulating plate 29 so as not to be detachable. Therefore,
Since the terminal plate 23 is fitted onto the terminal mounting plate 33 with its mounting legs c in contact with the insulating plate 29, it can be mounted on the electromagnet 14 without swinging. Thereafter, the lead wire 20a is passed through the notch 32, wound around the winding portion d of the terminal board 23, and connected to the terminal board by soldering.

After assembling the electromagnet 14 as described above, only the terminal plate 23 is brought into contact with an electrode (not shown) to perform a coil resistance test or the like. In this case, since the terminal board 23 is fixedly supported by the terminal mounting plate 33 as described above, the test can be easily performed without swinging. In addition, when molding the electromagnet 14 with resin, the terminal plate 23 is molded by housing the electromagnet 14 in a mold (not shown) and press-fitting the resin.
The resin insulating layer 38 is formed around the electromagnet 14 by holding it in a predetermined position without being fixedly supported by a mold. After producing the resin-molded electromagnet, this electromagnet is placed on the valve body 11 via the sealing material 40, and both are integrally tightened with the tightening bolts 39 to produce the electromagnetic valve M.

[Effect of idea]

Since the present invention is constructed as described above, it has the following effects.

In the present invention, the terminal mounting plate to which the terminal board is attached is inserted into the support projection protruding from the yoke through an insulating plate on the flat surface of one side of the yoke, and the ground terminal is installed vertically on the terminal mounting plate. By press-fitting the coil into the yoke through the fitting hole, it can be fixedly supported on the flat surface of the yoke without being rotated by the ground terminal, so the lead wire from the coil can be connected to the base of the terminal board. However, the terminal mounting plate can be installed on the flat surface of the yoke without rotating because it is received by the ground terminal. Even if an external force is accidentally applied to the terminal mounting plate, the mounting plate will not swing at all.
During the above test, the work of connecting and disconnecting the electrodes to the terminal board must be done smoothly, quickly, and reliably without requiring much effort or breaking the lead wire from the coil. can.

In addition, by connecting the lead wire to the base of the terminal board through the window hole provided in the yoke, the connection work between the terminal board and the lead wire can be performed outside the yoke of the electromagnet. can be carried out quickly and easily in a relatively large area.

Further, the terminal board is configured such that the engagement recess of the mounting leg can be freely engaged with and detached from the notch hole in the upper part of the terminal mounting plate 33, and can be mounted in such a manner that it cannot be easily removed. Therefore, when connecting the lead wire from the coil to the base of the terminal board,
As long as the terminal board is not intentionally removed from the terminal mounting board, disconnection of the lead wire can be reliably avoided, so when the electromagnet is resin molded, the lead wire and terminal board will not swing due to the filling pressure of the molding resin. Accidents caused by disconnection of the lead wire can be completely eliminated. Also, since the terminal board itself is fixedly supported by the terminal mounting plate, it can be held in the fixed position.
In addition, since it can be installed so that it always protrudes a certain amount from the resin insulation layer, there is no need to adjust the length of the external wiring when connecting with the external wiring, unlike in the past. connection work can be done.

Furthermore, when resin molding an electromagnet, the terminal plate can be fixedly supported on the terminal mounting plate without swinging, so there is no need to create a molding die with a structure in which the terminal plate is fixed within the die. Since the mold itself can be manufactured with a simple structure, the manufacturing cost of the mold itself can be reduced, and as a result, the manufacturing cost of the electromagnet can inevitably be reduced.

Furthermore, when attaching the terminal board to the terminal mounting plate, the engagement recess provided on the mounting leg of the terminal board can be hooked into the notch hole of the terminal mounting plate, making the terminal board installation work easy. In addition, the terminal mounting plate can be engaged with the support protrusion provided on the yoke using the fitting hole, and the ground terminal passed through the fitting hole can be press-fitted into the through hole of the yoke.
Most of the installation work for the terminal board and terminal mounting board can be done in one operation, and there is no need for parts or jigs to securely support these parts, making electromagnet assembly work quick and easy. It can be carried out efficiently and rationally, and the productivity can be significantly improved.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of a solenoid valve equipped with the terminal plate fixing device of the present invention, Figure 2 is a perspective view, Figure 3 is a front view of an electromagnet used in the solenoid valve, and Figure 4 is an exploded perspective view of the device of the present invention. FIG. 5 is a vertical sectional view of an electromagnet showing an example of a conventional terminal plate mounting structure. 14...Electromagnet, 20...Coil, 21...Yoke, 20a...Leader wire, 23...Terminal board, 25
... Support projection, 29 ... Insulating plate, 33 ... Terminal mounting plate, 34 ... Earth terminal, 35 ... Window hole.

Claims (1)

[Scope of utility model registration request] A fixed iron core 16 and a movable iron core 1 that opens and closes the fluid passage of the valve body 11 are fitted into the center hole of the coil bobbin 15 around which the coil 20 is wound.
9 is inserted into the guide tube 17 containing the coil 2.
A yoke 21, which is formed into a U-shape that can be divided into two parts and is magnetically held with the fixed iron core 16 and framed in a rectangular shape, is disposed on the outside of the yoke 21-0.
On the side flat surface, there is a coil 20 and a leader wire 20a on the top.
A window hole 35 is opened to lead out, and a support protrusion 25 is provided protruding from the center, and an insulating plate 29 is attached to this support protrusion 25.
This insulating plate 29 is brought into contact with one side of the yoke 21 by inserting the
A notch 32 for insertion is provided, and a notch hole 30 is provided at the end of the plate on the side of this notch 32 to detachably engage the mounting leg c of the base of the terminal plate 23. has a vertically long fitting hole 31 that engages with the support protrusion 25.
A terminal mounting plate 33 having a hole therein is removably attached to the support protrusion 25 via the insulating plate 29, and
The ground terminal 34 is press-fitted into the through hole 27 of the yoke 21 through the fitting hole 31 of the terminal mounting plate 33, and the terminal board fixing device 24 is fixed to one part of the yoke 21 by the terminal mounting plate 33 and the insulating plate 29. The notch hole 3 of the terminal mounting plate 33 of the terminal plate fixing device 24 is formed on the side.
0, the terminal plate 23 is provided so as to protrude in the same direction as the support protrusion 25 by detachably engaging and supporting the mounting leg of the base connected to the lead wire 20a, and the coil 20, the yoke 21, and the terminal plate An electromagnetic terminal board fixing device characterized in that the fixing device 24 and the fixing device 24 are made to protrude from a resin insulating layer 38 in which the fixing device 24 is integrally embedded.