JPH0512969Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention particularly relates to a solenoid in which a plunger is directly inserted into a core cylinder of a coil bobbin.

[Prior Art] The above-mentioned conventional solenoid in which the plunger is directly inserted into the core tube of the coil bobbin has a structure in which the plunger eye is placed on the same axis as the core tube outer side of the bobbin collar on the side from which the plunger eye projects, as shown in Fig. 6. The cylindrical portion C is formed as an extension, and the cylindrical portion C is inserted into and held through the through hole of the cover plate E fitted to the yoke.

[Problems to be solved by the invention] Inserting the cylinder part C into the through hole of the cover plate E as described above prevents the cylinder part C from bending and maintains smooth sliding of the plunger. This is nothing but a so-called centering, but since the above-mentioned cylindrical part C is integrally molded with a synthetic resin with the coil bobbin, considering the strength of the cylindrical part C, the cylindrical part is made long and thick. A method is adopted in which a lid plate E having a wall thickness corresponding to the length of the cylinder part C is inserted into the cylinder part C, but if the cylinder part C is formed to be long, the cylinder part H is substantially Frictional resistance acts on the plunger eye that protrudes as a guide, reducing the operating characteristics of the plunger.

On the other hand, if the cylindrical portion C is thick as described above, there is a problem in that it impedes the magnetic circuit characteristics and also deteriorates the operating characteristics of the plunger.

Therefore, the present invention aims to eliminate the problems that have arisen in the above-mentioned prior art by simple and rational means.

[Means for Solving the Problems] The configuration of the present invention to achieve the above object includes a yoke with a U-shaped cross section, a collar at both ends, a core cylinder with a coil wound between the collars, and a core cylinder with a coil wound between the collars. A coil bobbin consisting of a plunger inserted directly into the core tube is inserted so that the flange at one end faces the open end of the yoke, and a cover plate fitted to the yoke is placed on the outside of the flange at one end. In the solenoid of the side-by-side type, a contact plate whose outer edge is fitted and locked to the yoke is brought into contact with the outer surface of the cover plate, and the cover plate is sandwiched between the contact plate and the collar on the one end side. and an annular catch jaw inserted into the plunger through the contact plate and the collar on the one end side,
The gist is a solenoid characterized in that both receiving jaws are formed facing each other with an axial space interposed therebetween, and a through hole provided at the center of the cover plate is fitted and supported on the outer periphery of both receiving jaws. It is something.

[Embodiment 1] (Figures 1 and 2) 1 is a yoke with a U-shaped cross section, and inside this yoke 1, there are flanges 2 and 3 at both ends, and a coil 4 between the flanges 2 and 3. A coil bobbin consisting of a wound core tube 5 and a plunger 6 directly inserted into the core tube 5 is inserted and fitted with the collar 2 on the one end side facing the open end side of the yoke 1. A cover plate 7 made of a magnetic material whose outer edge is fitted to the inner wall of the yoke is attached to the outer surface of the yoke.

Therefore, the gist of the present invention is that a contact plate 8 whose outer edge is fitted and locked to the end of the yoke 1 on the outer surface of the cover plate 7 is provided.
(made of hard synthetic resin) to sandwich the cover plate 2 between this plate 8 and the collar 2 on the one end side, and the facing surface of the plate 8 and the collar 2 on the one end side. Annular receiving jaws 2a, 8a inserted into the plunger 6 are formed facing each other with an axial space 9 between them, and a through hole provided at the center of the cover plate 9 is provided on the outer periphery of both receiving jaws 2a, 8a. The hole 7b is fitted and supported.

[Operation] The plunger 6 in the core tube 5 is excited by the generation of magnetic flux by energizing the coil 4, and the tip side of the plunger 6 moves to protrude using the receiving jaws 2a, 8a as a guide. In addition, the jaw support 2a,
Since an axial space 9 is formed between 8a,
The frictional resistance of the plunger 6 is greatly reduced, and the plunger 6 can project smoothly.

[Example 2] (Figures 3 and 4) This example shows a self-holding solenoid, and therefore, in this example, the cover plate 7 is formed of permanent magnets, and the magnets are butted vertically, The through hole 7b naturally generated by this butt is fitted and held in the receiving jaws 2a, 8a, and the contact plate 8 is brought into contact with the outer surface of the cover plate 7, and the cover plate 8 is placed between the contact plate 8 and the collar 2. The receiving jaws 2a and 8a are sandwiched and formed to face each other with a space 9 interposed therebetween.
This is an example in which the through hole 7b of the cover plate is fitted onto the outer periphery of the cover plate. Therefore, the action is such that when the coil 4 is energized, the plunger 6 protrudes, and when the energization is removed, the plunger 6 is returned by the force of the cover plate 7, that is, the magnet.

[Embodiment 3] (Fig. 5) In this example, as in Examples 1 and 2, the center through hole 7b of the cover plate 7 is formed in the catch jaw 8a provided on the backing plate 8 and the catch jaw 2a provided on the collar 2. In addition to the fitting, there is also a shaft bearing part 2 consisting of a narrow annular protrusion on the hole edge of the insertion hole of the plunger 6 provided between the above-mentioned contact plate 8 and the collar 2.
b and 8b are provided, and the plunger is guided by these two bearing parts with as little frictional resistance as possible.

[Effects of the invention] As described above, according to the invention, the plunger is directly inserted into the core cylinder of the coil bobbin fitted to the yoke, and the cover plate 7 has the yoke fitted to the collar 2 on one end side of the coil bobbin. In the solenoid of the type that abuts on the center of the solenoid, a contact plate 8 is brought into contact with the outer surface of the cover plate 7, and the cover plate 7 is sandwiched between the corresponding plate 8 and the collar 2 on one end side, and the cover plate 7 through hole 7
b is fitted and supported by the receiving jaws 2a, 8a provided between the contact plate 8 and the collar 2 via a space 9. In other words, since the space 9 performs a non-contact action with respect to the plunger 6, the plunger 6 The frictional resistance of the plunger can be extremely reduced, and the plunger can be operated smoothly without deteriorating its sliding characteristics.

Furthermore, friction between the receiving jaws 2a and 8a can be prevented, thereby extending the life of the jaws, and centering accuracy can always be maintained.

In addition, since the through hole 7b of the cover plate 7 is supported by the catch jaws 2a, 8a from both ends thereof, the amount of protrusion of the catch jaws 2a, 8a is small even when considering the support strength. Moreover, since the wall thickness can be significantly reduced, the magnetic properties can be improved. In addition, the thickness of the cover plate 7 can be made thinner, which provides excellent practical effects that cannot be expected with conventional solenoids in which this type of plunger is inserted directly into the core tube of the coil bobbin.

[Brief explanation of drawings]

Fig. 1 is a vertical side view of the first embodiment, Fig. 2 is a front view of the above, Fig. 3 is a longitudinal side view of the second embodiment, Fig. 4 is a longitudinal front view of the above, and Fig. 5 is a longitudinal cross-section of the third embodiment. The side view and FIG. 6 are explanatory diagrams of a conventional example. 1... Yoke, 2, 3... Tsuba, 5... Core tube, 6
...Plunger, 7...Lid plate, 7b...Through hole, 8...Abutting plate, 2a, 8a...Batch jaw, 9...Space.

Claims (1)

[Scope of utility model registration request] A coil bobbin consisting of a yoke with a U-shaped cross section, a flange at both ends, a core cylinder with a coil wound between the flange, and a plunger directly inserted into the core cylinder, is placed inside the yoke. In a solenoid that is inserted so as to face the open end side, and a cover plate fitted to a yoke is attached to the outside of the collar on the one end side, the outer edge is fitted and locked to the yoke on the outer surface of the cover plate. an annular receptacle, the lid plate being sandwiched between the abutment plate and the flange on the one end side, and the plunger inserted into the abutment plate and the flange on the one end side; are formed facing each other with an axial space between both receiving jaws, and a through hole provided at the center of the cover plate is fitted and supported on the outer periphery of both receiving jaws.