JPH0512967Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Field of the Invention>> This invention relates to a bidirectional solenoid that is attracted and held in one of two positions.

《Summary of the invention》 This invention fixes a spool with a coil wound around an iron core having at least a large diameter part and a medium diameter part, and slides a slide yoke in the axial direction on the large diameter part and the magnetic shielding tube. As a result, a magnetic field is generated between the iron core, the slide yoke, and the magnetic cap to attract and hold the slide yoke to one of them.

《Prior art and its problems》 It is held in a neutral position by the force of a spring, the displacement output shaft is manually displaced, and it is held in one of two positions by the force of an electromagnet, and the electromagnet is not energized. An example of a bidirectional solenoid that returns the displacement output shaft to the neutral position by disconnecting the solenoid is shown in Japanese Utility Model Publication No. 59-26570.

However, such conventional devices have the following drawbacks. That is, since an iron core having a large diameter is to be surrounded by a yoke, it is impossible to assemble it in one piece, and the yoke needs to be assembled with other parts in addition to two parts with high precision, resulting in high costs. In addition, since the iron core is an insulating material and is configured to slide within a spool that is generally made of plastic, fine plastic powder is generated from this spool and accumulates inside the spool, resulting in unstable operation. .

These problems can be solved by increasing the spool diameter, or by increasing the spool wall thickness to prevent deformation of the spool due to winding pressure. However, the disadvantage is that the overall size becomes larger. Furthermore, if the displacement output was to be obtained only in the axial direction from the side of the coil, a separate member would be required, resulting in problems such as poor usability.

《Purpose of the invention》 This invention was devised in view of the above-mentioned problems.It is easy to assemble and manufacture at a low cost, has excellent operational stability, and can direct the displacement output in the axial direction or the coil side. The purpose of this invention is to provide an easy-to-use bidirectional solenoid that can output from any position.

《Structure and effect of the invention》 In order to achieve the above purpose, this invention
an iron core made of a axial magnetic material that is symmetrical and has at least a large diameter portion and a medium diameter portion, and is fitted and fixed to the large diameter portion of the iron core;
A spool made of a non-magnetic material with flanges on both sides and a coil wound around the outer periphery, and a spool that is fitted and fixed to the middle diameter part of the iron core,
A magnetic shielding tube having the same outer diameter as the large diameter portion and made of a non-magnetic material, and a magnetic shielding tube fixed to the rear end of the medium diameter portion and having an outer diameter larger than that of the magnetic shielding tube. The body cap slides in the axial direction along the large diameter part and the outer periphery of the magnetic shielding tube, and when displaced in one direction, a part of it directly contacts the large diameter part of the iron core to form a magnetic field, and the center The slide yoke is characterized by a U-shaped slide yoke having a convex portion or a concave portion formed therein.

As mentioned above, this design is structured so that the spool and magnetic shielding tube are fitted and fixed to the outer periphery of the iron core, and the U-shaped slide yoke is slidably and integrally attached to the magnetic shielding tube and the outer periphery of the large diameter part. Since it is a type of solenoid, the assembly work is easy and the number of parts is small, and this type of solenoid can be manufactured at low cost.

Further, in the present invention, since the iron core is fixed within the spool and is configured not to move within the spool, there is no risk of fine powder being generated due to movement, and the operation stability is extremely excellent.

Furthermore, in the present invention, the slide yoke is formed in a U-shape and has a convex portion or a concave portion in the center, so that displacement output can be easily output not only from both ends of the yoke but also from the sides of the coil. Therefore, it has the advantage of being extremely easy to use.

<<Description of Examples>> Fig. 1 is a partial cross-sectional view showing the right half of the bidirectional solenoid according to the present invention. The large diameter part 1a and the middle diameter part 1 are located at symmetrical positions.
b and a small diameter portion 1c are formed.

Further, flange portions 2a are provided on both sides of the outer periphery of the large diameter portion 1a of the iron core 1, and a coil 3 is wound around a cylindrical body 2b, and a spool 2 made of a non-magnetic material such as plastic is fitted. In addition, a step portion 2c is cut out in the flange portion 2a on the slide yoke side, which will be described later, and a cutout portion 2d is provided at the outer inner peripheral end of the flange portion 2a. The large diameter portion 1a of the iron core 1 is partially exposed.

In addition, it is preferable that the large diameter portion 1a of the iron core 1 and the spool 2 do not move in order to prevent wire breakage due to slight movement of the coil lead wire, and the two can be easily fitted and fixed by the following method. . That is,
After forming an uneven part on the outer periphery of the iron core 1 by knurling, etc., and press-fitting the spool 2 into this, a voltage higher than normal is applied to the coil 3 to heat and deform the spool 2, thereby causing the uneven part of the iron core to It can be easily fixed by biting the resin of the spool 2.

Reference numeral 5 denotes a magnetic shielding tube that is fitted and fixed to the outer periphery of the medium diameter portion 1b of the iron core 1, and this magnetic shielding tube 5 is made of a non-magnetic material such as brass or resin.
Its outer diameter is set to be flush with the large diameter portion 1a. Further, the abutment portion between the magnetic shielding tube 5 and the large diameter portion 1a is formed in a semicircular shape, thereby aligning the axis of the large diameter portion 1a and the magnetic shielding tube 5, and the slide yoke to be described later It is designed so that it does not get caught when crossing over. Similar effects can be obtained even if the shape is tapered instead of semicircular.

Reference numeral 6 denotes a slide yoke that slides in the axial direction on the large diameter portion 1a of the iron core 1 and the outer periphery of the magnetic shielding tube 5. The slide yoke 6 is made of a magnetic material such as iron, and is formed in a U-shape. , an insertion hole 7 is formed on the end surface 6a side, and a protrusion 6b or a recess is formed in the center. The slide yoke 6 is attached to the large diameter portion 1a of the iron core 1 and the outer periphery of the magnetic shielding tube 5 so as to be slidable in the axial direction, and when the slide yoke 6 is displaced in one direction, the slide yoke 6 Either end face and large diameter part 1
a are in direct contact with each other to form a magnetic field.

Further, a magnetic cap 8 made of a magnetic material such as iron and having an outer diameter larger than the outer diameter of the magnetic shielding tube 5 is fitted into the small diameter portion 1c of the iron core 1. A magnetic cap 8 is fixed to the end of the small diameter portion 1c by caulking the end.

Note that the lengths of the large diameter portion 1a of the iron core 1, the spool 2, etc. are set as follows. That is, if the length of the large diameter portion is T, the spool length S is set to be slightly shorter than this. The magnetic shield tube length U is the same as the medium diameter section. The magnetic shielding tube 5 is divided into two by the end of the slide yoke, and if the length up to the magnetic cap 8 side is V, then the amount of displacement of the slide yoke 6 is twice V. Let W be the length of the other half of the shielding tube, and this W is shorter than V. Therefore,
In FIG. 1, when the slide yoke 6 is moved to the left from the position A _O by an amount V in the drawing, the end of the slide yoke 6 passes over the magnetic shielding tube 5 and reaches the large diameter portion 1a made of magnetic material. Y is the thickness of the flange portion 2a.

Furthermore, it goes without saying that the thicknesses of the magnetic cap 8 and the slide yoke 6 are determined depending on the strength, magnetic flux density, and the like.

The present invention is constructed as described above, and its operation will next be explained mainly with reference to FIG. 1.

When the coil 3 is not energized, the slide yoke 6 is at the neutral position A _O due to the force of a spring (not shown).

Next, a displacement is manually applied to the convex portion 6b of the slide yoke 6 (temporarily to the left). At this time, the coil 3 is energized in conjunction with another means. When the slide yoke 6 moves by V, the slide yoke 6
The right end surface of the slide yoke 6 is in direct contact with the large diameter portion 1a of the iron core 1 (position A _L ), and the left end surface of the slide yoke 6 is in contact with the left magnetic cap 8. Then, the magnetic field lines are iron core 1 - slide yoke 6 - magnetic cap 8 -
Since a loop is formed with the iron core 1, the slide yoke 6 is attracted and held by the left magnetic cap 8. In addition,
During the movement of the slide yoke 6, the slide yoke 6 is magnetically isolated by the magnetic shielding tube 5, so that it is not held by the middle diameter portion 1b.

When the current to the coil 3 is cut off by another means, the slide yoke 6 returns to the neutral position by the force of a spring (not shown). The displacement to the right (A _R ) is also the same as above, so its explanation will be omitted.

The one shown in FIG. 3 shows another embodiment of this invention, and in this embodiment, the hole diameter of the magnetic cap 8 is equal to or larger than the middle diameter portion 1b, and the magnetic cap is shielded from the magnetic cap. The diameter is made the same as that of the tube 5, and even with such a configuration, the same magnetic field and effect as described above can be obtained. With this configuration, the number of stepped portions in the iron core 1 is reduced, so that it can be manufactured at a lower cost.

In the present invention, the step 2c is cut out in the flange 2a of the spool 3 at right angles to the sliding direction of the slide yoke 6, so the slide yoke rotates in the direction perpendicular to this while sliding freely left and right. Therefore, even if the shaft rotates a little, it does not cause any displacement in the axial movement distance and stable output can be obtained.In addition, in the above embodiment, the displacement is output from the side of the coil. As described above, the output in the axial direction can be easily obtained by slightly extending both ends of the U-shaped slide yoke 6.In addition, the solenoid of the present invention can be attached to other parts by forming a protrusion on the flange 2a of the spool 2. The magnetic cap 8 can be easily attached by forming a convex part on another part, and by forming the magnetic cap 8 into a square shape and fitting it into a square recess provided on another part, it can be easily attached in the axial direction. It can be stably mounted without being displaced in the direction of rotation or rotation, and it is also possible to attach and caulk a U-shaped hanging bracket to the outer periphery of the cap, and to fasten this U-shaped bracket and other parts with screws or the like.

[Brief explanation of the drawing]

Figure 1 is a partial sectional view of the right half of the solenoid according to the present invention, Figure 2 is a perspective view of the solenoid according to the present invention, and Figure 3 is a right half cutaway showing another embodiment of the present invention. FIG. 1... Iron core, 1a... Large diameter part, 1b... Medium diameter part, 1c... Small diameter part, 2... Spool, 3... Coil, 5... Magnetic shielding tube, 6... Slide yoke, 8
...Magnetic cap.

Claims (1)

[Scope of Claim for Utility Model Registration] An iron core made of a shaft-shaped magnetic material that is symmetrical and has at least a large diameter portion and a medium diameter portion, which is fitted and fixed to the large diameter portion of the iron core, and
A spool made of a non-magnetic material with flanges on both sides and a coil wound around the outer periphery, and a spool that is fitted and fixed to the middle diameter part of the iron core,
A magnetic shielding tube having the same outer diameter as the large diameter portion and made of a non-magnetic material, and a magnetic shielding tube fixed to the rear end of the medium diameter portion and having an outer diameter larger than that of the magnetic shielding tube. The body cap slides in the axial direction along the large diameter part and the outer periphery of the magnetic shielding tube, and when displaced in one direction, a part of it directly contacts the large diameter part of the iron core to form a magnetic field, and the center A bidirectional solenoid comprising a U-shaped slide yoke with a convex portion or a concave portion.