JPH0218566B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention has a large electrical load such as a car, and depending on the driving conditions, the current consumption increases significantly at night due to the lighting of headlights and other electric lights. In such cases, in order to prevent the required current from flowing to the load due to the internal resistance of the power supply, it is necessary to switch the power supply depending on the current value, such as switching two batteries to parallel connection. This invention relates to a multi-stage operating magnet for sequentially switching resistors, switches, etc. according to the magnitude of current value.

As shown in FIG. 1, in the conventional magnet, a fixed core 3 is caulked to a plate 2 fixed to a horizontal axis 1, a coil 5 is wound around a bobbin 4 fitted on the fixed core 3, and the coil 5 is connected to the fixed core 3. A movable core 7 is housed in a bobbin 7 with a spring 6 interposed therebetween, and a stopper 8 fixed to the yoke 1 prevents the movable core 7 from being removed.When a current flows through the coil 5 and supermagnetism is generated, The movable core 7 compresses the spring 6 and is attracted to the fixed core 3, and the motion of the movable core 7 is transmitted to move the required load.

Therefore, if the current value applied to the coil 5 has a magnetomotive force sufficient to attract the movable core 7 to the fixed core 3 against the spring 6, the coil 5 will operate, and the attracting force will not exceed the urging force of the spring 6. For example, the movement of the movable core 7 returning, that is, the return operation is only one stage.In order to perform multi-stage operation according to the magnitude of the current value, the number of magnets must be equal to the number of operating stages.
A mechanism is required to combine these and switch the required number of stages, which has the drawback of requiring a large amount of space and cost.

The present invention enables multi-stage operation with one magnet by sequentially operating many movable cores built into the magnet in accordance with the current value. The purpose is to eliminate defects.

Now, one embodiment of the present invention will be described with reference to FIGS. 2 to 6. The fixed core 11 is crimped by the plate 12 and inserted into the bobbin 13.
is fixed in the yoke 14 by caulking the plate 12 to the yoke 14, and a core 15 is wound around the bobbin 13.

A third movable core 16 is provided in the center hole of the fixed core 11.
is slidably inserted, a third spring 17 is interposed between it and the fixed core 11, and the force of this spring 17 causes the third movable core 16 to move against the bobbin 1.
It is pressed into contact with the inner diameter stepped portion of No. 3.

The second movable core 18 is slidably inserted into the center hole of the third movable core 16, and the second movable core 18 is slidably inserted into the center hole of the third movable core 16.
A second spring 19 is interposed between the movable core 18 and the bobbin 13, and the second movable core 18 is pressed against the second inner stepped portion of the bobbin 13 by the force of the second spring 19.

The first movable core 20 is housed in the center hole of the yoke 14 and the bobbin 13, and a first spring 21 is installed between it and the second movable core 18, and the force of this spring 21 moves the first movable core 20 is pressed against a stopper 22 fixed to the yoke 14;
The strength of each spring 17, 19, 21 is set in the following relationship: first spring 21<second spring 19<third spring 17.

Therefore, when the coil 15 is not energized,
Each movable core 16, 18, 20 has a spring 1
7, 19, and 21 and are in the state shown in Fig. 2. However, when a certain specified value of current is applied to the coil 15, the supermagnetic force first moves the first movable The core 20 is attracted to the second movable core 18 against the spring 21, and the first movable core 20 is attracted to the second movable core 18 against the spring 21.
Perform stage operation.

However, the attraction force generated between the second movable core 18 and the third movable core 16 and between the third movable core 16 and the fixed core 11 is
9. The third spring 17 is the first spring 2
Since the biasing force is larger than the biasing force of 1, these are not attracted to each other and are held in that state, resulting in the state shown in FIG.

Next, when the current applied to the coil 15 increases to the second specified value, the magnetic flux passing through the contact portion 18a of the second movable core 18 and the third movable core 16 is saturated, and the magnetic flux passing through the non-contact portion 18b is reduced. increases, the force that attracts the second movable core 18 to the third core 16 becomes stronger, the second movable core 18 overcomes the second spring 19, and the second movable core 18, together with the first movable core 20, attracts the third core 16. It is sucked into the movable core 16 and becomes the state shown in FIG.
The first movable core 20 performs the second stage of operation.

When the current applied to the coil 15 further increases and becomes equal to or higher than the third specified value, the magnetic flux passing through the contact portion 16a between the third movable core 16 and the fixed core 11 is saturated, and the magnetic flux passing through the non-contact portion 16b is reduced. increases, the force that attracts the third movable core 16 to the fixed core 11 increases, and the third movable core 16 overcomes the third spring 17 and attracts the first movable core 20 and the second movable core. 18 and is attracted to the fixed core 11, the state shown in FIG. 5 is reached, and the first movable core 20 completes the third stage operation.

In the above embodiment, there were three movable cores and therefore three springs, but by increasing the number of movable cores and springs, the number of operating stages can be increased by the increased number. be.

In this embodiment, if a slide piece 24 for changing the resistance value of the volume 23 is attached to the tip of the first movable core 20, the current value flowing through the coil 15 can be turned OFF or adjusted according to the first to third specified values. The first movable core 20 is 0, 4 in FIG.
By adjusting the position, the resistance value of the volume 23 can be changed in three stages.

If a slide switch is used in place of the volume 23, it is possible to switch to four circuits, and by connecting the first movable core 20 to a required mechanism, it is possible to switch to four stages of operation.

Further, the present invention will be described with reference to a second embodiment shown in FIGS. 7 to 10. A fixed core 31 is crimped to a yoke 33 to which a plate 32 is fixed.
A coil 35 wound around a bobbin 34 is fitted into this, and a third movable core 36 is slidably accommodated in the bobbin 34 facing the fixed core 31.
A third spring 37 is installed between the fixed core 31 and the third movable core 36, and the force of this spring 37 presses the third movable core 36 against a stopper 38 fixed to the plate 32.

A second movable core 39 is slidably accommodated in the fixed core 31 facing the third movable core 36, and a third
The movable core 36 is pressed downward by a second spring 40 installed between the second movable core 36 and the second movable core 39 , and is brought into pressure contact with a stopper 41 fixed to the yoke 33 . The first movable core 42, which is penetrated into the interior and protruded to the outside, is slidably housed in the center hole of the third movable core 36, and is attached to a spring 43 installed between the third movable core 36 and the third movable core 36. Therefore, the first movable core 42 is brought into pressure contact with the second movable core 39, and the strength of each spring is set in the following order: first spring 43<second spring 40<third spring 37. .

As in the first embodiment, while the coil 35 is not energized, each movable core 36, 39, 42 is pushed by each spring 37, 40, 43 and assumes the position shown in FIG. For example, as shown in FIG. 10, the tip 42a of the core 42 is connected to a knob 44a of a switch 44, and a force stronger than that of the first spring 43 is applied to the knob 44a. is the third movable core 36
Therefore, the knob 44a is pushed in the direction of the switch 4.
It is moving to the OFF side of 4.

In this state, when the knob 44a is operated to the ON side and the coil 35 is energized, the first movable core 42 comes into close contact with the second movable core 39, and suction is created between the movable core 42 and the movable core 39. However, as long as the force obtained by subtracting the force of the first spring 43 from the force pushing the knob 44a toward the OFF side of the switch 44 is less than the suction force, the knob 44a
It returns to the OFF position and maintains the state shown in FIG. 10, but when the current in the coil 35 exceeds the first specified value, the force that attracts the first movable core 42 to the second movable core 39 becomes stronger. When the force becomes larger than the above-mentioned subtracted force and becomes the state shown in FIG. 7, the knob 4
4a is held on the ON side of the switch 44.

In this state, when the current to the coil 35 further increases and exceeds the second specified value, the magnetic flux passing through the contact portion 45a between the first core 42 and the third core 36 is saturated, and the second movable core 39 The magnetic flux passing through the gap 45b between the second movable core 39 and the third movable core 36 increases, and the attractive force generated between the second movable core 39 and the third movable core 36 exceeds the force of the second spring 40, and the second The movable core 39 is attracted to the third movable core 36 together with the first movable core 42 as shown in FIG. 8, and the knob 44a is moved as the first movable core 42 moves.
Move to the OFF side.

When the current flowing through the coil 35 further increases and exceeds the third specified value, the second movable core 39 and the third
The magnetic flux passing through the contact portion 46a of the movable core 36 is saturated, and the magnetic flux passing through the gap portion 46b where the third movable core 36 and the fixed core 31 face each other increases, resulting in an attractive force exceeding the urging force of the third spring 37. occurs between the third movable core 36 and the fixed core 31, and as shown in FIG.
a moves to the ON side.

In this way, as the current value flowing through the core 35 reaches the first to third specified values from OFF,
Switch 44 in 4 stages: OFF-ON-OFF-ON
The operation can be switched alternately.

In this embodiment, the first spring 43 is used to balance the magnitude of the acting force of the knob 44a, and if the acting force of the knob 44a is appropriate, it may be omitted. Mata switch 4
If you use a volume instead of 4, you can switch the resistance value in 4 stages: large - small - large - small, or small - large - small - large.In addition to the volume, you can also use it to switch various loads. It can be used.

FIG. 11 shows a modification of the embodiment shown in FIGS. 7 to 10 described above, in which a first spring 43 is installed in the direction in which the first movable core 42 moves away from the second movable core 39. , the first movable core 42 is pressed against the third movable core 36, and the strength of each spring is the same as in the above embodiment.

The order of operation of the movable cores is that the first movable core 42, the second movable core 39, and then the third movable core 36 are attracted in this order.

As described above, in the present invention, at least three movable cores housed so as to be slidable in the axial direction are provided with step portions that can be inserted into each other, and a contact portion that contacts the step portions before sliding is provided. Since the movable core is formed, the condition for moving is when the coil current increases, the magnetic flux at the contact portion of the core is saturated, and the axial magnetic flux increases. Therefore, the core does not move until the magnetic flux of the core contact portion is saturated, and it is clear whether the core is activated or not, and the operating current can be set extremely easily. In addition, since the core moves sequentially or reciprocates according to the current value, when moving the position sequentially, the volume,
If connected to a slide switch etc., the resistance value can be changed step by step or the circuit can be changed sequentially.In the case of reciprocating motion, the resistance value and circuit can be changed repeatedly, allowing for multi-stage operation. However, one coil is sufficient, and one volume and one switch are also sufficient. Therefore, the installation volume can be minimized, and it can be provided at low cost.

[Brief explanation of drawings]

Figure 1 is a sectional view of a conventional magnet, Figures 2 to 6 are a first embodiment of the present invention, Figures 2 to 5 are sectional views showing operating states, and Figure 6 is a volume The connected sectional views, Figures 7 to 9 are
In the embodiment, Fig. 10 is a sectional view showing the operating state, Fig. 10 is a sectional view showing the case where it is connected to a switch, Fig. 11 is
This figure is a sectional view showing a modification of the embodiment of FIG. 2. 15, 35... Coil, 11, 31... Fixed core, 20, 42... First movable core, 18, 39
...Second movable core, 16,36...Third movable core, 21,43...First spring, 19,
40...Second spring, 17, 37...Third
spring.

Claims (1)

[Scope of Claims] 1. Step portions are formed that are slidably accommodated in the coil in the axial direction and that can be inserted into each other,
at least three movable cores each having a contact portion with which the stepped portion comes into contact before sliding; one end of each of the movable cores being provided with springs having the same number as the number of movable cores and each having a different strength; A multi-stage actuation magnet comprising a fixed core facing one of the movable cores, the movable cores being attracted to the magnet in sequence according to the magnitude of the current value applied to the coil.