JPH0217444Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to solenoids used as functional parts for automation in home appliances such as tape recorders and video recorders, entertainment machines such as pachinko machines, vending machines, office equipment, etc. It is.

Conventional solenoids include single-coil type solenoids, in which when the coil 1 is energized, the movable core 2 is attracted to the fixed core 3, and the energized state is maintained, as shown in the first diagram. When the primary coil 1 is energized as shown, the movable iron core 2 is attracted,
Primary coil 1 and secondary coil 4 are switched on by an external switch.
connected in series to reduce and maintain the current,
In other words, when the coil 1 is energized as shown in FIG. 3, the movable core 2 is attracted.
When the current is turned off, the movable iron core 2 is held by the permanent magnet 5, and when the polarity is changed and the coil 1 is energized,
In some cases, the movable iron core 2 returns to its original position because the permanent magnet 5 is excited in the opposite direction.

However, the first solenoid has disadvantages such as high power consumption, less suction force when temperature rises, and large size considering suction power and temperature rise. , there are disadvantages such as the coil winding process is complicated, power consumption is required, circuits for operation and holding are required, and there is a high possibility of accidents due to heat generation while energizing. For solenoids, the polarity must be changed in order to return the movable iron core in the case of a single coil, it is susceptible to vibration, the machining accuracy is high, and in the case of a multi-turn coil, a return circuit is required, and the holding force is There are drawbacks such as a large amount of variation.

The present invention aims to provide a solenoid that can overcome the above-mentioned conventional drawbacks.

An embodiment of the present invention will be described below based on the drawings. Reference numeral 6 indicates a frame, 7 a fixed core, 8 a movable core, and 9 a lock release movable core that is slidably fitted to the outer periphery of the movable core 8. , 10 are stepped portions provided on the movable core 8 to receive the movable core 9.
Reference numeral 11 indicates a stepped portion 12 provided on the movable core 8 and the movable core 9.
This is a spring interposed between the step portion 13 provided in the movable iron cores 8 and 9 to reduce the attraction force when the movable cores 8 and 9 are excited. 14 is a pipe interposed between the movable iron core 8 and the movable iron core 9, and this pipe 14
Sometimes it is omitted to create a space. 15 is a coil bobbin provided on the outer periphery of the fixed iron core 7 and the movable iron core 9;
16 is a solenoid coil wound around the coil bobbin 15, 17 is a front frame, 18 is a stopper fixed to the suction port of the front frame 17,
This allows the movable iron core 8 to slide freely to the outside of the front frame 17, and prevents the movable iron core 9 from passing outside the front frame 17. Reference numeral 19 denotes a pair of claw pieces made of a magnetic material, which are attached to the movable core 8 at a position close to the outside of the stopper 18 so as to be able to protrude and retract from both sides of the movable core 8. 20 is a long hole provided in the claw piece 19, and 21 is a pin fitted into the long hole 20, which is fixed to the movable iron core 8. Reference numeral 22 denotes a load hole in the movable iron core 8.

Next, the operation of the solenoid having the above configuration will be explained. When the solenoid is not energized, the fourth solenoid
As shown in the figure, the movable core 9 is connected to the stepped portion 10 of the movable core 8.
is in contact with In this state, when the coil 16 is energized, the movable cores 8 and 9 are magnetized together, so that the movable core 8 is connected to the fixed core 7 as shown in FIG.
At the same time, the movable iron core 9 is also attracted to the movable iron core 8.
I am drawn to it. When the movable cores 8 and 9 are attracted, the claw pieces 19 located outside the stopper 17 move to the inside of the stopper 17. Then, a magnetic attraction force is applied to the claw pieces 19 from the front frame 17, and the claw pieces 19 protrude from both sides of the movable iron core 8, that is, move to the lock position.

When the power is turned off in this state, the movable core 8 tries to return to its original position due to an external load as shown in the sixth figure, but since the claw pieces 19 protrude from both sides of the movable core 8, The movable iron core 8 has a play gap between the claw piece 19 and the stopper 17 of 0.2~
When it returns to about 0.3mm, the claw piece 19 touches the stopper 1.
The movable iron core 8 is held in a suction state by hitting the inner side of the movable iron core 7, that is, locking the movable iron core 8. Note that the movable iron core 9 returns slightly due to the elasticity of the spring 11, and the movable iron core 8
Although an air gap is created between the step part 10 and the claw piece 19 butting against the stopper 17,
Since a load is applied to the claw piece 19, it hits the oblique side 23 of the claw piece 19 and is prevented from returning to its original position.

When the coil 16 is energized in this state, the movable core 8 is attracted to the fixed core 7 and moves toward the fixed core 7 through the play gap of about 0.2 to 0.3 mm, and the claw piece 1
9 becomes no load. Since an air gap is generated between the movable core 9 and the movable core 8, the movable core 9 does not move together with the movable core 8. Conversely, an attractive force acts on the movable core 9 due to the magnetic force from the front frame 17, so the movable core 9 Returning to the original position, the claw pieces 19 protruding from both sides of the movable core 8 can be pushed toward the center of the movable core 8, that is, pushed back to the unlocked position.

If the current is turned off in this state, the movable core 8
is returned to its original position by an external load.

The present invention is not limited to the configuration shown in the above-mentioned embodiments. For example, as shown in FIG. A spring 11 may be interposed between the movable core 9 and the fixed core 7 as shown in FIG. 12, or instead of the stopper 17, the end of the movable core 8 on the suction port side is placed inward in a non-magnetic pipe 24 into which the movable cores 8 and 9 are inserted, as shown in Figure 9. bend to 2
5, and a non-magnetic stopper 27 having a through hole 26 through which only the movable core 8 passes is attached to the bent portion 25, or a through hole 26 through which only the movable core 8 passes and a claw piece as shown in FIG. A stopper 28 made of a magnetic material and having a stepped portion 27 for locking the stopper 19 may be provided. In addition, instead of the claw piece 19, a through hole 29 is provided that extends from the center of the movable iron core 8 to both sides as shown in FIG. A pair of magnetic claw pieces 31 may be pivoted 32 at the center of the movable iron core 8 as shown in FIG. Instead, a pair of magnetic pins 33 may be inserted into the through hole 29, or the first
As shown in Figure 4, a pair of non-magnetic balls 30 are connected with a spring 34 so as to be constantly pushed out from both ends of the through hole 29, or as shown in Figure 15, a pair of non-magnetic claw pieces 31 are connected with a spring 35. The movable iron core 8 is constantly pressed so that it protrudes from both sides, or the
As shown in Figure 6, a pair of non-magnetic claws 31 are constantly pushed out from the center of the movable iron core 8 to both sides by a spring 36, or as shown in Figure 17, a pair of non-magnetic pins 33 are pushed out by a spring 37. so that it is always pushed out to both sides of the movable core 8,
When plate springs 38 are attached to both sides of the movable core 8 as shown in the figure, or grooves 39 are provided in the movable core 8 at a position close to the front frame 17 as shown in FIGS. 19 and 20, when the coil is energized. It cuts into the groove 39 by the magnetic force of the front frame 17,
A movable iron core is provided with a pair of claws 40 that interrupt and stop when energization is stopped, and is configured so that when the coil is energized again, it is attracted by the magnetic force of the front frame 17 in the same way as the movable iron core 9, A movable iron core 41 for unlocking may be provided to move the claw 40 to a position where it is removed from the groove 39.

Since the present invention is configured as described above, when the current is turned off after the coil is energized to attract the movable core, the locking piece automatically engages the stopper and the movable core is attracted. Hold. Therefore, there is no need to keep current flowing through the coil while the movable core is being held, resulting in low power consumption, no reduction in suction power due to temperature rise, no accidents due to heat generation during energization, and miniaturization. , there is no need to provide operating and holding circuits, the circuit configuration and coil winding process are simplified, it is resistant to vibration, there is little variation in holding force, there is no need to increase processing accuracy, and manufacturing is easy. It has various practical effects such as being easy to use.

[Brief explanation of the drawing]

Figures 1 to 3 are sectional views showing examples of conventional solenoids, Figures 4 to 20 show embodiments of the present invention, Figure 4 is a sectional view of the entire solenoid, and Figure 5 is a sectional view of the entire solenoid. Figure 6 is a cross-sectional view of the main part when the coil is energized, Figure 6 is a cross-sectional view with the movable core held when the current is turned off, Figure 7 is a diagram showing an example of changing the movable core and spring attachment, and Figure 8 is a cross-sectional view of the main part when the coil is energized. A diagram showing another modification of the movable iron core and spring attachment, FIG. 9 a diagram showing a modification of the stopper, FIG. 10 a diagram showing another modification of the stopper, and FIGS. 11 to 19 show a modification of the stopper. FIG. 20 is a plan view of the locking piece in FIG. 19, showing various modified embodiments of the piece. 6... Frame, 7... Fixed iron core, 8... Movable iron core, 9... Movable iron core for removable lock, 11... Spring, 16... Solenoid coil, 18...
Stopper, 19...Latching piece.

Claims (1)

[Scope of utility model registration request] In a solenoid, a solenoid coil and a fixed iron core are provided inside a frame, and a movable iron core is inserted from a suction port of a front frame of the frame to the solenoid coil, which is attracted to the fixed iron core when the coil is energized. A movable iron core for unlocking which is attracted by the magnetic force from the front frame when the solenoid coil is energized is fitted on the outer periphery of the solenoid coil, and the movable iron core is provided with a stepped portion for receiving the movable iron core for unlocking, A spring is interposed between the movable iron core and the movable iron core for unlocking, and a spring is inserted in the suction port of the front frame to move the movable iron core for unlocking when the movable iron core for unlocking is attracted to the front frame. A stopper is provided to stop the iron core at a position where an air gap is formed between the iron core and the step part, and a stopper is provided at a position of the movable iron core close to the stopper, which moves to a position where it locks with the stopper when the movable iron core is attracted. A solenoid provided with a locking piece that is released from the stopper by the movable iron core when the lock releasing movable iron core is attracted.