JPH0546251Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a plunger type electromagnet.

(Prior Art) Generally, a plunger type electromagnet has a plate body 1a and leg parts 1b at both ends thereof, which are perpendicular to the plate body 1a, as shown in FIG. 4, and a plunger insertion hole is provided in one of the leg parts. 1c, a cylindrical bobbin 2 held between both legs of the yoke 1 and having flanges 2a at both ends, and a coil 3 wound around the cylindrical portion of the bobbin 2. and a plunger 4 inserted into the cylindrical portion of the bobbin through the plunger insertion hole 1c of the yoke 1.

By the way, in the plunger type electromagnet having the above configuration, in order to hold the bobbin 2 on the yoke 1, a cylindrical protrusion is provided on one flange 2a of the bobbin 2, and this cylindrical protrusion is attached to one side of the yoke 1. The fixing member 5 is inserted into the plunger insertion hole 1c provided in the leg, and the fixing member 5 is inserted into the gap between the other flange 2a of the bobbin 2 and the other leg 1b of the yoke 1. The bobbin 2 is held and fixed at a predetermined position on the yoke 1 by a manual method, a plate spring, or the like. In this case, the gap between the other leg 1b of the yoke 1 and the other flange 2a of the bobbin 2 is necessarily large because the cylindrical protrusion of the flange 2a is inserted into the plunger insertion hole 1c of one leg. It is something that is formed.

(Technical problem to be solved by the invention) However, in such a conventional plunger type electromagnet, the step of inserting the fixing member 5 into the gap between the other leg 1b of the yoke 1 and the other flange 2a of the bobbin 2 is difficult. In addition, since the length of the cylindrical portion of the bobbin 2 relative to the yoke 1 is also shortened by the gap, the number of windings of the coil is correspondingly reduced, resulting in a problem of poor winding efficiency. Furthermore, the smaller the gap between the plunger insertion hole 1c and one cylindrical protrusion of the bobbin 2 inserted into this hole, the better the magnetic properties will be. However, the bobbin is usually made of a material such as synthetic resin. Therefore, if the wall thickness of the cylindrical protrusion is made thin, there will be problems in terms of material molding conditions, mechanical strength, etc., and a certain level of wall thickness must be ensured.

The present invention was developed in view of the above-mentioned problems, and its purpose is to easily fix the bobbin in a predetermined position on the yoke without using a fixing member, and to create a plunger-type coil with good winding efficiency and magnetic properties. Located in providing electromagnets.

(Means for Solving the Problems) In order to achieve the above object, the present invention has a plate body, legs at both ends thereof perpendicular to the plate body, and a plunger insertion hole in one of the legs. a U-shaped yoke provided; a cylindrical bobbin held between both legs of the yoke and having flanges at both ends;
In a plunger type electromagnet comprising a coil wound around a cylindrical part of the bobbin and a plunger inserted into the cylindrical part of the bobbin through a plunger insertion hole of the yoke, both edges of one leg of the yoke are provided. A notched groove is provided in the yoke, a protrusion is provided on one flange of the bobbin in correspondence with the notched groove in the leg of the yoke, and the protrusion is fitted into the notched groove to fix the bobbin in a predetermined position of the yoke. It is configured to do this.

(Function) In a plunger type electromagnet having such a configuration, the bobbin is inserted between the legs of the yoke using the elastic force of the flanges at both ends, and the protrusion provided on one of the flanges is inserted. By fitting into the notch groove provided on one leg of the yoke,
Since the bobbin is held and fixed at a predetermined position on the yoke, there is no need to use a fixing member like in the past, and positioning is possible without providing a cylindrical protrusion on the flange of the bobbin to be inserted into the plunger insertion hole. This makes it possible to achieve the above objective.

(Example) An example of the present invention will be described below with reference to the drawings.

Figures 1a and 1b show an example of the configuration of a plunger type electromagnet according to the present invention, in which figure a is a front view and figure b is a side view seen from the plunger side.

In FIG. 1, reference numeral 11 denotes a U-shaped yoke having leg portions 11b perpendicular to the plate surface at both ends of the plate. A plunger insertion hole 11c is provided at approximately the center of the plunger insertion hole 11c, and cutout grooves 11d are formed symmetrically on both upper side edges of the plunger insertion hole 11c. Further, the other leg portion 11 of the yoke 11
The inner surface of b is provided with a protrusion 11e extending linearly in the direction of both side edges thereof.

On the other hand, 12 is a cylindrical bobbin made of synthetic resin, for example, which is held between the legs 11b of the yoke 11 and has flanges 12a at both ends.
As shown in FIGS. 3a and 3b, 2 has a protrusion 12b on one flange 12a corresponding to the notched groove 11d formed in one leg 11b of the yoke 11.
is provided. The protruding portion 12b is formed of a horizontal portion whose upper end surface is horizontal and an inclined portion which is inclined diagonally downward from the horizontal portion. Further, as shown in FIGS. 3a and 3b, the other flange 12a of the bobbin 12 has a linear groove 1 corresponding to the linear protrusion 11e formed on the other leg 11b of the yoke 11.
2c is formed. In this case, the notch groove 11d formed in the leg portion 11b of the yoke 11 and the protrusion 1
1e, the corresponding positions of the protrusion 12b formed on the flange 12a of the bobbin 12 and the linear groove 12c are the plunger insertion hole of the yoke 11 and the bobbin 1.
The holes in the two cylindrical parts are aligned so that they match. Furthermore, guide projecting pieces 12d are formed on both sides of each flange 12b of the bobbin 12, and the guide projecting pieces 12d allow the bobbin 12 to move in the vertical direction along both sides of each leg 11b of the yoke 11. It is becoming more and more guided by.

In order to hold the bobbin 12 in the yoke 11 having such a structure, the bobbin 12 is inserted by pressing the bobbin 12 from above between both legs of the yoke 11 while guiding the guide protruding pieces 12d to both sides of each leg. Ru. In this case, a protrusion 12b formed on one flange 12b of the bobbin 12 and a linear protrusion 11 formed on the other leg 11b of the yoke 11
e, both flanges 12a are slightly bent due to their inherent elasticity. As the bobbin 12 moves downward between the legs of the yoke 11, the yoke 1
The linear protrusion 11e on the other leg of the yoke 11 is fitted into the linear groove 12c on the other flange 12a of the bobbin 12, and the bobbin is inserted into the notch 11d on the other leg 11b of the yoke 11. The protrusion 12 on one flange 11b of 12
By fitting b, the bobbin 12 is fixed at a predetermined position between the legs 11b of the yoke 11.

In addition, in FIGS. 1a and 1b, 13 is bobbin 1.
2 is a coil wound around a cylindrical portion, and 14 is a plunger inserted into the cylindrical portion of the bobbin 12 through a plunger insertion hole 11c.

In this embodiment, the bobbin 12 is inserted between both legs 11b of the yoke 11 from above by utilizing the elastic force of the flange, and the protrusion 12b provided on one of the flanges 12a is inserted between the legs 11b of the yoke 11. The linear protrusion 11e provided on the other leg 11b of the yoke 11 is fitted into the notched groove 11d provided on the leg 11b, and the linear groove 12c provided on the other flange 12a of the bobbin 12 is inserted into the linear protrusion 11e provided on the other leg 11b of the yoke 11. Since the bobbin 12 is held and fixed at a predetermined position on the yoke 11 by fitting into the yoke 11, there is no need to use a fixing member as in the conventional case. Positioning can be performed using only the dimensional accuracy of the yoke and bobbin without providing a section. Therefore, the bobbin 12 can be easily and firmly fixed at a predetermined position on the yoke 11, and the cylindrical portion of the bobbin 12 can be effectively used, so that the winding efficiency and magnetic properties of the coil can be improved.

In the above embodiment, a linear protrusion 11e is also provided on the other leg 11b of the yoke 11, and a linear groove 12c is provided on the other flange 12a of the bobbin 12 so that these are fitted. However, these do not necessarily need to be provided.

(Effects of the invention) As described above, according to the invention, the bobbin can be easily fixed at a predetermined position on the yoke without using a fixing member, and a plunger type electromagnet with good coil winding efficiency and magnetic properties is provided. can do.

[Brief explanation of the drawing]

Figures 1a and b show an embodiment of a plunger-type electromagnet according to the present invention, in which a is a front view, b is a right side view of figure a, and Figures 2a and b are yokes in the same embodiment. Figure 3 a, b, and c show the bobbin in the same embodiment, where a is a front view, b is a right side view of figure a, Similarly, FIG. 4 is a left side view, and FIG. 4 is a sectional view showing an example of the configuration of a conventional plunger type electromagnet. 11... Yoke, 11a... Plate, 11b...
Leg portion, 11c...Plunger insertion hole, 11d...
...Notch, 11d...Linear protrusion, 12...
Bobbin, 12a... flange, 12b... protrusion, 12c... linear groove, 12d... guide protrusion piece, 13... coil, 14... plunger.

Claims (1)

[Scope of utility model registration request] A U-shaped yoke that has a plate body and legs perpendicular to the plate body at both ends thereof and a plunger insertion hole in one of the legs, and a U-shaped yoke that is held between both legs of this yoke and has both ends. A plunger type electromagnet comprising a cylindrical bobbin having a flange, a coil wound around the cylindrical part of the bobbin, and a plunger inserted into the cylindrical part of the bobbin through a plunger insertion hole of the yoke, A notched groove is provided on both side edges of one leg of the yoke, a protrusion is provided on one flange of the bobbin corresponding to the notched groove of the leg of the yoke, and the protrusion is fitted into the notched groove. A plunger type electromagnet, wherein the bobbin is fixed at a predetermined position on the yoke.