JPS6035809B2 - solenoid - Google Patents

Description

[Detailed description of the invention] The present invention relates to a solenoid that provides a noise reduction effect.

Conventionally, as shown in FIG. 1, this type of solenoid has a movable iron core 3 in the hollow part of a cylindrical bobbin 2 around which an excitation coil 1 is wound.
In addition, there is a device in which the fixed core 4 is provided in a manner that it can be detached at will, and a frame 5 is provided to surround the excitation coil, and the fixed core 4 is attached to the frame 5 via a cushioning material 6 such as rubber.

In this case, the fixed core 4 has an end portion attached to the frame 5 formed into a small diameter portion 41, and the annular buffer material 6 is inserted into the small diameter portion 41, and is fixed to the frame 5 in this state. However, in this case, a buffer material 6 is interposed between the fixed core 4 and the frame 6, and the fixed core 4 is magnetically connected to the frame 5 via a small light portion 41.

Therefore, compared to the cross-sectional area of the large diameter portion of the fixed core 4, the small diameter portion 41
Since the cross-sectional area of the magnet becomes extremely small, the magnetic flux that passes through this portion is suppressed, resulting in a considerable decrease in the attractive force and subsequent holding force. By the way, for example, if the diameter d of the small diameter portion 41 is set to D/2 with respect to the large diameter dimension D of the fixed core 4, then the cross sectional area of the small diameter portion 41 is 25 compared to the cross sectional area of the large flea.
%, and the magnetic flux that passes through this portion is largely suppressed.

Furthermore, since the position of the shock absorber 6 is far from the collision surface of the fixed core 4 that the movable core 3 collides with, the collision sound generated at the collision surface propagates to other areas before reaching the shock absorber 6. No sound silencing effect could be obtained.

Furthermore, when the movable core 3 collides with the fixed core 4, the collision force causes the fixed core 4 to retreat while adsorbing the movable core 3 while compressing the buffer material 6, and then due to the rebound force of the buffer material 6. It is restored and stabilized at the predetermined operation completion point.

However, in this case, the amount of retraction of the fixed core 4 varies indefinitely depending on the hardness of the buffer material 6 and the conditions of use of the solenoid, such as changes in electromagnetic force due to fluctuations in power supply voltage and the size of the load, so the point at which the drive of the load is completed is unnecessary. This has the disadvantage that the load may be exceeded, which has a negative impact on the load. This invention was made to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a solenoid that can obtain a good noise reduction effect, a large suction force and a holding force, and can also eliminate an adverse effect on the load. shall be. An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 2a and 2b, 11 is a cylindrical bobbin, an excitation coil 12 is wound around this bobbin 11, and a frame 13 is provided so as to surround this excitation coil 12.

Further, a movable iron core 14 and a fixed iron core 15 are provided in the hollow portion of the bobbin 11 so as to be freely adjustable. In this case, fixed core 1
5 has a recess 1 in the center of the entire surface as shown in Fig. 3a and b.
51 is formed, and two, for example, half-moon-shaped projecting walls 152 and 153 are formed on opposite sides of the concave portion 151. A buffer material 16 is inserted into the recess 151 of the fixed core 15, and the tips of the projecting walls 152, 153 are fixed to the frame 13. In this case, fixed core 15
The tips of the projecting walls 152 and 153 are passed through the frame 13 and fixed by caulking 18 via washers 17, as shown in FIG. 2B. The cushioning material 16 inserted into the recess 151 has a predetermined size g as shown in FIG.
Only the protruding frame 13 is supported. Note that in FIG.
A recess 1 corresponding to the protrusion 141 is provided on the end face of the opposite side.
54 is formed.

Next, its effect will be explained. It is now assumed that the movable iron 014 is separated from the fixed iron 015, and when the excitation coil 12 is energized in this state, the movable iron 014 moves to the left in the figure and is attracted to the fixed iron core 15. (This state is shown in the illustrated example) In this case, the movable iron D14 and the fixed iron 015
Vibrations occur due to the collision, but these vibrations are attenuated by the cushioning material 16, resulting in a good sound deadening effect.

In addition, a recess 1 formed at the center of one end surface of the fixed iron core 15
A cushioning material 16 is inserted into the hole 51. As a result, if the diameter of the fixed core 15 is 0 and the diameter of the recess 151 is D/2, then 75% of the cross-sectional area of the fixed core 15 can be used, and in reality, although it is slightly lost due to the gap g, the fixed core 15 The effective magnetic path area between the frames 13 can be made larger than that of the conventional one, and the magnetic flux transmitted through this portion is increased, so that the attractive force and the subsequent operation holding force can be increased accordingly. Furthermore, since the cushioning material 16 is arranged opposite to the collision surface between the movable iron core 14 and the fixed iron core 15, the dimension t between them is made as small as possible as shown in FIG. They can be placed close to each other, thereby absorbing the collision sound before it propagates elsewhere, and from this point of view as well, the silencing effect can be further enhanced. Furthermore, when the movable iron core 14 collides with the fixed iron 015, the collision force causes the fixed iron core to
5 retreats while compressing the buffer material 16, but the amount of this retreat can be regulated only by the gap g, so compared to the conventional fixed iron core in which the amount of retreat is unlimited, the amount of overflow at the point where the drive of the load is completed can be reduced. This can be minimized and the negative impact on the load can be eliminated. It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented with appropriate modifications without changing the gist.

For example, in the above example, two projecting walls 162, 15 are attached to the fixed iron 015.
Although 3 was formed, this attack may be formed in more than 2 pieces. As described above, according to the present invention, it is possible to provide a solenoid that provides a good noise reduction effect, a large suction force and a large holding force, and can eliminate an adverse effect on the load.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view showing an example of a conventional solenoid, Figure 2
Figures a and b show one embodiment of this invention, a is a longitudinal sectional view,
3b is a side view, FIGS. 3a and 3b are fixed iron cores used in the same embodiment, a is a front view, b is a side view, and FIG. 4 is a schematic configuration diagram showing the diamond part of the same embodiment. . 1... Excitation coil, 2... Bobbin, 3...
....Movable iron core, 4....Fixed iron core, 41....
... Small portion, 5 ... Frame, 6 ... Cushioning material, 11 ... Bobbin, 12 ... Excitation coil, 13 ... Frame , 14...Movable core, 141...Protrusion, 15...Fixed core,
151... recess, 152, 153...
Projection wall, 154... recess, 16... cushioning material, 17... washer, 18... caulking. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A cylindrical bobbin wound with an excitation coil, a frame provided to surround the excitation coil, a recess formed in the center of one end surface, and at least two bobbins sandwiching the recess. A fixed core forming a projecting wall and provided in the hollow part of the bobbin and fixed to the frame via the projecting wall; A cushioning material that is in contact with
A solenoid comprising a movable core provided in a hollow portion of the bobbin so as to be able to move toward and away from the fixed core. 2. The solenoid according to claim 1, wherein a truncated conical protrusion is formed at the tip of the movable core, and a recess corresponding to the protrusion is formed on the end face of the stationary core opposite thereto. .