JPH11135324A - Solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid which can surely maintain a mobile core in an attracted state, even if the load applied to the mobile core fluctuates. SOLUTION: A solenoid coil is incorporated in the space S of the main body 10 of a solenoid formed by combining a magnetic yoke 11 formed in a U-shaped with a cover body 12, which closes the opened side face of the yoke 11 and a mobile core 14 is movably inserted into the coil. Then a fixed core is provided at the part corresponding to one end of the core 14, and a latch mechanism 16 which operates following the attracting operation of the mobile core 14 to the fixed core is provided at the other end. When the mobile core 14 is attracted to the fixed core, the attracted state of the mobile core 14 is mechanically maintained by engaging the tooth section 21b of a mobile ring 21, constituting part of the latch mechanism 16 with the engaging step section 17d of an engaging block 17 formed on the inner peripheral surface of the cover body 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for energizing an electromagnetic coil to attract a movable iron core to a fixed iron core, and to attract and hold the movable iron core to the fixed iron core even after the energization of the electromagnetic coil is cut off. The present invention relates to an improvement of a solenoid configured to perform the operation.

[0002]

2. Description of the Related Art Conventionally, when a movable iron core is urged in a suction direction, a suction state can be maintained even when the urging force is released.
Conversely, when the movable iron core is returned to its original position, a so-called self-holding type solenoid having a structure in which a biasing force in a direction opposite to the above direction is applied to return the movable iron core to the original position has been developed.

FIG. 1 shows the self-holding type solenoid.
The general structure will be described with reference to FIGS. 11 and 12
In the figure, reference numeral 1 denotes a magnetic yoke formed in a U-shape, and a plate-like auxiliary yoke 2 is fitted to an opening end of the magnetic yoke by, for example, caulking. Fixed iron cores 3 and 4 are attached to central portions of the magnetic yoke 1 and the auxiliary yoke 2, respectively. Reference numerals 5a and 5b denote first and second electromagnetic coils inserted and held inside the magnetic yoke 1 with a magnetic spacer 6 and a permanent magnet 7 interposed therebetween. It is formed by winding several times. Reference numeral 8 denotes a movable iron core movably inserted inside the first and second electromagnetic coils 5a and 5b. In FIGS. 11 and 12, reference numeral 8a denotes a movable rod which is non-rotatably and irremovably attached to the movable iron core 8 using a pivot pin 8b.

Next, the operation will be described. 11, the movable iron core 8 by the action of the magnetic flux [Phi _m of the permanent magnets 7 are attracted to the fixed iron core 4 of the auxiliary yoke 2 side. In this state, the repulsion to the magnetic flux [Phi _m (overcome) to induce the magnetic flux, when energized current to the first electromagnetic coil 5a, as shown in Figure 11, the movable iron core 8 → gap → the fixed iron core 3 → Magnetic yoke 1 → permanent magnet 7 → magnetic spacer 6 →
Magnetic flux Φ _i is induced in the first magnetic path including the movable core 8, and the action of the magnetic flux Φ _i causes the movable core 8 to move toward the fixed core 3 attached to the magnetic yoke 1 (to the left in FIG. 11). It moves and is attracted to the fixed iron core 3 as shown in FIG. Thereafter, even when turned down the power supply to the first electromagnetic coil 5a, the movable core 8 by the action of the magnetic flux [Phi _m of the permanent magnet 7 to flow within said first magnetic path, as shown in Figure 12 The state of suction to the fixed iron core 3 is maintained.

Further, as shown in FIG. 12, when returning from the state where the movable core 8 is attracted to the fixed core 3 to the state shown in FIG. 11, current is supplied to the second electromagnetic coil 5b. As shown in FIG. 12, the movable core 8 → the air gap →
Fixed iron core 4 → auxiliary yoke 2 → magnetic yoke 1 → permanent magnet 7
A magnetic flux Φ _i is induced in the second magnetic path composed of the magnetic spacer 6 and the movable iron core 8. By the action of the magnetic flux Φ _i , the movable iron core 8 is moved to the fixed iron core 4 attached to the magnetic yoke 2 (FIG. 12). (To the right), and is attracted to the fixed iron core 4 as shown in FIG. Thereafter, even if the power supply to the second electromagnetic coil 5b is cut off, the movable iron core 8 remains in the second electromagnetic coil 5b.
By the action of the magnetic flux Φ _m of the permanent magnet 7 flowing in the magnetic path of
As shown in FIG. 11, the state of suction to fixed iron core 4 is maintained.

As described above, in this type of solenoid, when a current is applied to one of the first and second electromagnetic coils 5a and 5b, a magnetic flux Φ is generated in a magnetic path. _i is induced, and the movable core 8 is attracted to the fixed core 3 or 4 by the action of the magnetic flux Φ _i , and after the movable core 8 is attracted, the movable core 8 is attracted by the action of the magnetic flux Φ _m of the permanent magnet 7. It is configured to maintain a suction state.

[0007]

However, the solenoid having the above configuration has the following problems as apparent from the description of the operation principle.

Although the solenoid does not require the force of a return spring to return the movable core to its original position, it requires two electromagnetic coils and a fixed core, and always moves one side of the electromagnetic coil when the movable core moves. Only the energization is performed to operate the movable iron core, so that it is difficult to use two electromagnetic coils efficiently, which is not only uneconomical, but also increases the number of parts and increases the size of the solenoid. It was a big factor.

Further, since the solenoid keeps the movable core attracted by the action of the magnetic flux of the permanent magnet after the power supply to the electromagnetic coil is cut off, the solenoid is applied to the movable core (movable rod). Although there is no problem if the load is constant, when the load fluctuates during the operation of the solenoid and a load exceeding the magnetic force of the permanent magnet is applied to the movable core, the movable core is easily released from the attracted state. Therefore, there is a possibility that a device using the solenoid may malfunction.

The above problem can be solved by increasing the magnetic force of the permanent magnet. However, when the magnetic force of the permanent magnet is increased as described above, it is necessary to reduce the magnetic flux of the permanent magnet every time the solenoid is operated. In addition, since a large current had to be supplied to the electromagnetic coil to generate a magnetic flux that repelled the magnetic flux of the permanent magnet, it was very uneconomical.
When the movable iron core moves from one fixed iron core to the other fixed iron core, the movable iron core is affected by the magnetic force of the permanent magnet, so that its operation is not smooth.

The present invention has been made in view of the above-mentioned various problems, and has been made in consideration of the above-mentioned various problems, even if the load applied to the movable core fluctuates, the solenoid ensures that the attracted state of the movable core is maintained and the movable core itself operates smoothly. The purpose is to provide.

[0012]

According to the present invention, there is provided a magnetic yoke formed in a U-shape, a cover for closing an open side surface of the magnetic yoke, and a magnetic yoke. An electromagnetic coil inserted into a space formed by the cover body, a movable core movably inserted inside the electromagnetic coil, a fixed core fixed to the magnetic yoke to suck the movable core, A return spring for returning the movable iron core to the original position direction, and further, on the side opposite to the surface of the movable iron core attracted to the fixed iron core, operates following the suction operation of the movable iron core to the fixed iron core. A solenoid is provided by providing a latch mechanism. As a result, only one electromagnetic coil and a fixed core are required for attracting the movable core, and the number of parts can be reduced and the size of the solenoid can be reduced.

In addition, the latch mechanism includes a magnetic plate, a hollow cylindrical mounting cylinder fastened and fixed to an end face of the movable iron core opposite to an end face attracted to the fixed iron core, at an outer periphery of the movable iron core. The movable core is attached to the stationary core, and the linear motion when the movable core is attracted to the fixed core is converted into an intermittent rotational motion, whereby the movable core is held and returned in the suction state. It is characterized by. This eliminates the need to use permanent magnets, and allows the solenoid to be driven economically and smoothly.

Further, the latch mechanism includes a hollow cylindrical mounting cylinder fastened and fixed to a movable iron core, a fixing ring fitted to the mounting cylinder and having a plurality of teeth, A support ring fitted to the mounting cylinder in a state of being fitted inside, rotatably loosely fitted to the support ring, an inner half meshing with the teeth of the fixing ring, and an outer half being a cover body A movable ring having a plurality of teeth locked by a locking block formed on the inner peripheral surface of the movable ring; and a pressing ring loosely and non-rotatably fitted to the support ring and applying a pressing force to the movable ring. When the movable core is sucked, the teeth of the movable ring are locked by the locking block on the inner peripheral surface of the cover, and when the movable core is returned, the movable core is sucked again by the fixed core to return the locking block and the movable ring. Release lock with tooth Characterized in that the so that.
Thereby, even if the load fluctuates, the suction state of the movable core can be reliably maintained, and the return operation of the movable core can be easily performed.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. In FIGS. 1 and 2,
Reference numeral 11 denotes a magnetic yoke formed of a U-shaped magnetic material, and reference numeral 12 denotes a cover formed of a resin material in a U-shape in the same manner as the magnetic yoke 11.
Engaging piece 1 formed on the end side opposite to the open end
An engaging window 1 formed on the opening end side of the magnetic yoke 11
As shown in FIGS. 1 and 7, the solenoid main body 10 is assembled into a rectangular shape by pressing and opening the open end of the magnetic yoke 11 with the magnetic yoke 11 to form a space S therein.

Next, reference numeral 13 denotes an electromagnetic coil inserted into the space S of the solenoid main body 10 and is constituted by winding a coil conductor around a hollow coil bobbin 13a a predetermined number of times. 14 is inside the electromagnetic coil 13, FIG.
A movable iron core movably inserted in the left-right direction. A concave portion 14a having a truncated cone shape is recessed at the distal end (left side in FIG. 1), and a movable rod 14b made of a nonmagnetic material is connected to a pivot pin 14c. To make it impossible to remove and rotate. 1
Reference numeral 5 denotes a truncated conical fixed core that is fitted to the magnetic yoke 11 and that loosely fits into a recessed portion 14a formed at the tip of the movable core 14 by applying a current to the electromagnetic coil 13. The movable core 14 is attracted by the induced magnetic flux Φ _i .

Reference numeral 16 denotes a latch mechanism provided on the base end side (the right side in FIG. 1) of the movable iron core 14, and its structure will be described below.

In FIG. 3, reference numeral 17 denotes a plurality of locking blocks formed on the inner peripheral surface of a cylindrical shape (see FIG. 7) on the end side opposite to the opening end of the cover body 12; A groove 17a having a predetermined width is formed between the grooves 17.
In addition, first and second inclined surfaces 17b, 17 having different inclination angles are provided on the distal end side (left side in FIG. 3) of the locking block 17.
c is formed.

Reference numeral 18 denotes a mounting cylinder which is fastened to the base end (the right side in FIG. 1) of the movable core 14 using a bolt B or the like. A hollow cylindrical member is applied to the base end of the movable core 14. The partition wall 18a is divided into two parts by the contacting partition wall 18a. As shown in FIG. 3, a pair of window holes 18b and a pair of groove portions 18c are formed in the cylindrical portion that stores the base end portion of the movable iron core 14 (only one groove portion 18c is shown).
A flange 18d is formed at the end of the tubular portion located rearward (right side in FIG. 3) from the partition wall 18a.

Reference numeral 19 denotes a fixing ring formed with a plurality of tooth portions 19b having inclined surfaces 19a having a predetermined inclination angle, and the outer peripheral surface thereof has an inner peripheral surface of the cover body 12 as shown in FIGS. A plurality of fitting pieces 19c which are loosely fitted in the concave groove portions 17a formed on the mounting cylindrical body 18 are formed on the inner peripheral surface as shown in FIG. A pair of protrusions 19d and protrusions 19e to be fitted with 18c are formed respectively (only one protrusion 19e is shown).

Reference numeral 20 denotes a support ring which is inserted inside the fixing ring 19 and has an inner peripheral surface as shown in FIG.
Window 18b and groove 18c formed in mounting cylinder 18
A pair of protrusions 20a and protrusions 20b are formed respectively (only one protrusion 20b is shown).

Reference numeral 21 denotes a movable ring formed with a plurality of teeth 21b having an inclined surface 21a having a predetermined angle, and is rotatably loosely fitted to the outside of the support ring 20, as shown in FIGS. The outer half of the tooth portion 21b is engaged with a locking block 17 formed on the inner peripheral surface of the cover body 12, and the inner half is a tooth portion 19 formed on the fixing ring 19.
b (see FIGS. 1 and 2).

Reference numeral 22 denotes a pressing ring loosely fitted to the outside of the support ring 20.
Protruding portion 2 that fits into notch groove 20d formed in flange portion 20c
2a are formed as a pair. As shown in FIGS. 1 and 2, one end face of the pressing ring 22 is
5, and the other end face contacts a magnetic plate described later when the movable core 14 is attracted to the fixed core 15 as shown in FIG. And presses the movable ring 21.

When assembling the latch mechanism 16, the support ring 20 is pressed with the pressing ring 22 and the movable ring 2.
1, each is loosely fitted and inserted into the inside of the fixing ring 19, the projection 22a of the pressing ring 22 is fitted into the notch groove 20d of the supporting ring 20, and in this state, the fixing ring 19 and the supporting ring 20 Projection 19 formed on the inner peripheral surface of
As shown in FIGS. 1 and 2, window holes 18 b and groove portions 1 b formed in the mounting cylinder 18 are provided.
8c. Thereby, the fixed ring 19 and the support ring 20 are non-rotatably attached to the mounting cylinder 18, and the movable ring 21 is moved between the fixed ring 19 and the pressing ring 22 by the support ring The pressing ring 22 is mounted so as to be rotatable around the center, and the pressing ring 22 is movable in the axial direction with respect to the supporting ring 20 with one end surface of the pressing ring 22 in contact with the movable ring, and It is mounted non-rotatably in the circumferential direction.

Next, as shown in FIGS. 1 and 2, the mounting cylinder 18 to which the rings 19 to 22 are integrally mounted is attached.
It is fastened to the base end of the movable iron core 14 with a bolt B or the like. Thereafter, the fitting piece 1 formed on the outer peripheral surface of the fixing ring 19 is formed.
The assembly of the latch mechanism 16 is completed by loosely fitting the 9c into the concave groove 17a on the inner peripheral surface of the cover body 12, as shown in FIG. Thereby, each of the rings 19 to 22 is
Attached to the base end of the movable iron core 14 via the mounting cylinder 18, following the movement of the movable iron core 14, along a concave groove 17 a formed on the inner peripheral surface of the cover body 12, FIG.
2 can be movable in the left-right direction.

In FIGS. 1 and 2, reference numeral 23 denotes a flange 18d formed at the end of the cover 12 and the end of the mounting cylinder 18.
And a return spring interposed therebetween, and constantly presses and biases the movable iron core 14 toward the original position. Reference numeral 24 denotes a magnetic plate made of a magnetic material interposed between the electromagnetic coil 13 and the latch mechanism 16, and reference numeral 25 denotes the electromagnetic coil 13.
The O-ring interposed between the magnetic yoke 11 and
Indicates a guide cylinder of the movable iron core 14 inserted inside the electromagnetic coil 13.

Next, the operation of the solenoid of the present invention will be described. First, when attracting the movable core 14 to the fixed core 15 as shown in FIG. 5 from the state in which the movable core 14 has returned to the original position as shown in FIG. As shown by 4, the movable core 14 → the air gap → the fixed core 15 → the magnetic yoke 11 → the magnetic plate 24
→ Magnetic flux Φ _i is induced in the magnetic path composed of the movable iron core 14,
Due to the action of the magnetic flux Φ _i, the movable iron core 14 starts to move toward the fixed iron core 15 (to the left in FIG. 4) against the elastic force of the return spring 23.

As described above, the movable core 14 is fixed to the fixed core 1.
When the movement to the 5th side is started, the latch mechanism 16 attached to the base end of the movable core 14 also starts to move to the fixed core 15 following the movement of the movable core 14. The movable iron core 14
In the stage before the start of the movement (the home position return state), the teeth 21 of the movable ring 21 forming a part of the latch mechanism 16
FIG. 6B shows the cover body 12 as shown in FIGS.
Is loosely fitted in a concave groove portion 17a formed on the inner peripheral surface of the groove.

When the movable iron core 14 starts to move from this state, the fixing ring 19 forming a part of the latch mechanism 16
As shown in FIG. 6A, the movable ring 21 is moved in a state where the inclined surface 21a of the tooth portion 21b of the movable ring 21 is brought into contact with the inclined surface 19a of the tooth portion 19b as shown in FIG. 6B, the loose fit between the groove 17a on the inner peripheral surface of the cover 12 and the teeth 21b of the movable ring 21 is released, as shown in FIG. 6B.

The movable iron core 14 is fixed to the fixed iron core 15.
When it moves to the predetermined position on the side, the pressing ring 22 constituting a part of the latch mechanism 16 comes into contact with the magnetic plate 24 as shown in FIG. Press ring 22 is magnetic plate 2
Even after the contact with the movable core 4, the movable core 14 continues to move toward the fixed core 15, and is attracted to the fixed core 15 as shown in FIG. 5. At the same time as the movable core 14 is attracted to the fixed core 15, the movable ring 21
Receives the pressing force from the pressing ring 22, whereby between the inclined surface 21 a of the tooth portion 21 b of the movable ring 21 and the inclined surface 19 a of the tooth portion 19 b of the fixed ring 19, the inclined surface 19 a, Due to the presence of 21a, the pressing force acts to move the movable ring 21 in the downward direction in FIG.
And a predetermined distance from the position matching the concave groove 17a as shown in FIG. 7 to the position where the back surfaces of the teeth 21b and the teeth 19b of the fixing ring 19 abut as shown in FIG. I do.

Thereafter, when the current supply to the electromagnetic coil 13 is stopped, the movable core 14 attracted by the fixed core 15 is moved.
Moves to the original position by the elastic force of the return spring 23. When the movable iron core 14 moves from the state shown in FIGS. 6C and 5 toward the original position, the fixing ring 19 which constitutes a part of the latch mechanism 16 also moves (FIG. 6C )). As a result, the tooth portion 21b of the movable ring 21 that has been rotated by a predetermined distance from the position that matches the concave groove portion 17a in the previous stage becomes the fixed ring 1
9 is released, and comes into contact with the first inclined surface 17b of the locking block 17 formed on the inner peripheral surface of the cover body 12, as shown in FIGS.

Further, in this state, the pressing ring 22 receives the elastic force of the return spring 23 to move the movable ring 21 as shown in FIG.
(D) to the right, whereby the inclined surfaces 17b, 21 are located between the inclined surface 21a of the tooth portion 21b of the movable ring 21 and the first inclined surface 17b of the locking block 17.
Due to the presence of a, the elastic force of the return spring 23 acts to move the movable ring 21 downward in FIG. 6D, and the movable ring 21 is shown in FIGS. 6E and 9. Thus, the tooth portion 21b rotates by a predetermined distance to a position where the tooth portion 21b is locked by the locking step 17d of the locking block 17. As a result, as shown in FIGS. 1 and 2, the movable core 14 is held while being moved to the fixed core 15 side.

As described above, in the present invention, the operation of the latch mechanism 16 is performed even after the movable iron core 14 is attracted to the fixed iron core 15 and the latch mechanism 16 is operated at the same time as the power supply to the electromagnetic coil 13 is cut off. As a result, the state in which the movable core 14 is moved toward the fixed core 15 can be maintained, so that the holding ability of the movable core 14 can be remarkably improved as compared with the conventional case using the magnetic flux of the permanent magnet. be able to.

Next, as shown in FIGS.
A description will be given of a case where, as shown in FIG. 4, the wire 4 is returned to the original position from a state where the wire 4 has been moved to the fixed iron core 15 side. When a current is applied to the electromagnetic coil 13 in the state shown in FIGS. 1 and 2, as shown in FIG. 1, the movable iron core 14 → the air gap → the fixed iron core 15 → the magnetic yoke 11 → the magnetic plate 24 → the movable iron core 1
Flux [Phi _i is induced in the magnetic path in a four, the magnetic flux [Phi _i
As a result, the movable iron core 14 starts to move toward the fixed iron core 15 against the elastic force of the return spring 23.

As described above, the movable iron core 14 is fixed to the fixed iron core 1.
When the movement to the fifth side is started, the latch mechanism 16 attached to the base end of the movable core 14 also starts to move following the movement of the movable core 14. When the movable core 14 starts to move from the state shown in FIGS. 6E and 9, the fixed ring 19 forming a part of the latch mechanism 16 is attached to the inclined surface 19 a of the tooth portion 19 b by the movable ring 21. Inclined surface 21 of tooth portion 21b
a in contact with the movable ring 21 as shown in FIG.
6F, the locking state between the teeth 21b of the movable ring 21 and the locking step 17d of the locking block 17 is released, as shown in FIG.

Subsequently, the movable core 14 is fixed to the fixed core 1.
When it moves to the predetermined position on the fifth side, the pressing ring 22 constituting a part of the latch mechanism 16 comes into contact with the magnetic plate 24. Even after the pressing ring 22 comes into contact with the magnetic plate 24, the movable iron core 14 continues to move toward the fixed iron core 15 as shown in FIG.
As shown in FIG. At the same time that the movable core 14 is attracted to the fixed core 15, the movable ring 21, which forms a part of the latch mechanism 16, receives a pressing force from the pressing ring 22. Between the inclined surface 21 a and the inclined surface 19 a of the tooth portion 19 b of the fixing ring 19, the inclined surface 19 a
a, 21a, the pressing force is applied to the movable ring 21.
6 (f) is moved downward, so that the movable ring 21 is moved from a position that matches the locking step 17d of the locking block 17 as shown in FIG. 6 (f).
As shown in FIG. 6 (g), the toothed portion 21b and the fixed ring 19 rotate by a predetermined distance to a position where the back surfaces of the toothed portions 19b abut against each other.

Thereafter, when the current supply to the electromagnetic coil 13 is stopped, the movable core 14 attracted to the fixed core 15 is moved.
Moves toward the original position by the elastic force of the return spring 23. The state shown in FIG. 6 (g) and FIG.
6 moves in the original position direction, the fixing ring 19 forming a part of the latch mechanism 16 also moves (FIG. 6).
(Retreat at (g)). As a result, the tooth portion 21b of the movable ring 21 that has been rotated by a predetermined distance from the position that matches the locking step 17d of the locking block 17 at the previous stage is released from the pressing state by the fixed ring 19, FIG. 6 (h)
And as shown in FIG. 10, it contacts the 2nd inclined surface 17c of the locking block 17 formed in the inner peripheral surface of the cover body 12. As shown in FIG.

Further, in this state, the pressing ring 22 receives the elastic force of the return spring 23 to move the movable ring 21 as shown in FIG.
(H) to the right.
Of the inclined surface 21a of the tooth portion 21b and the second
Between the movable ring 2 and the inclined surface 17c of the movable ring 2 due to the presence of the inclined surfaces 17c and 21a.
6 (h), the movable ring 21 has its teeth 21b formed between the locking blocks 17 as shown in FIGS. 6 (i) and 7. Is rotated by a predetermined distance to a position where the groove 17a is loosely fitted. As a result, the movable iron core 14 returns to the original position by the elastic force of the return spring 23 as shown in FIG.
The latch mechanism 16 also returns to the original position following the movement of the movable iron core 14, as shown in FIGS. 4 and 6A.

As described above, when the movable core 14 is returned to the original position, the electromagnetic coil 13 is energized again to attract the movable core 14 to the fixed core 15, thereby releasing the holding state by the latch mechanism 16. Therefore, unlike the related art, there is no need to use two electromagnetic coils and a fixed iron core to perform suction and return of the movable iron core. Therefore, it is possible to provide a small-sized solenoid having excellent energy saving effect. It becomes possible.

[0040]

As described above, according to the present invention, the latch mechanism is attached to the base end of the movable core attracted to the fixed core so as to be co-movable with the movable core, and the movable core is attached to the fixed core. Since the latch mechanism is operated following the suction operation to hold and release the suction state of the movable core, two electromagnetic coils and two fixed cores for attracting and returning the movable core are provided as in the conventional case. Since only one electromagnetic coil for attracting the movable iron core and one fixed iron core are required without the need, the solenoid of this type can be made compact by greatly reducing the number of parts.

Further, since the solenoid of the present invention does not require a permanent magnet, a minimum amount of current for generating a magnetic flux required to attract the movable core to the fixed core is applied to the electromagnetic coil. Since it is not necessary to supply a large current to the electromagnetic coil as in the related art, it is possible to operate the solenoid economically. In addition, the movable iron core can be operated smoothly because it is not affected by the magnetic flux of the permanent magnet.

Further, the latch mechanism locks the teeth formed on the movable ring with the locking steps of the locking block formed on the cover when the movable core is attracted to the fixed core. In the present invention, it is possible to hold the suction state of the movable iron core by a mechanical latch mechanism.
As a result, even if the load applied to the movable iron core (movable rod) fluctuates, the suction state of the movable iron core can be reliably maintained, and malfunction of equipment using the solenoid can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a solenoid of the present invention.

FIG. 2 is a vertical sectional side view.

FIG. 3 is an exploded longitudinal sectional view showing a latch mechanism.

FIG. 4 is a vertical sectional front view showing a state in which a movable core has returned to an original position.

FIG. 5 is a longitudinal sectional front view showing a state in which a movable core is attracted to a fixed core.

FIG. 6 is a diagram illustrating the operation of the latch mechanism.

FIG. 7 is a cross-sectional plan view showing a state where the teeth of the movable ring are loosely fitted in the concave grooves.

FIG. 8 is a cross-sectional plan view showing a state in which loose fit between the teeth of the movable ring and the grooves is released.

FIG. 9 is a cross-sectional plan view showing a state where the teeth of the movable ring are locked by the locking steps.

FIG. 10 is a cross-sectional plan view showing a state where the engagement between the teeth of the movable ring and the engagement step is released.

FIG. 11 is a longitudinal sectional view showing a state before a conventional solenoid operates.

FIG. 12 is a longitudinal sectional view showing a state after operation of a conventional solenoid.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Solenoid main body 11 Magnetic yoke 12 Cover body 13 Electromagnetic coil 14 Movable iron core 15 Fixed iron core 16 Latch mechanism 17 Locking block 17d Locking step 18 Mounting cylinder 19 Fixing ring 19b Tooth 20 Support ring 21 Movable ring 21b Tooth 22 Pressing ring 23 Return spring 24 Magnetic plate

Claims (3)

[Claims] A magnetic yoke formed in a U shape, a cover body for closing an open side surface of the magnetic yoke, an electromagnetic coil inserted in a space formed by the magnetic yoke and the cover body, A movable core movably inserted inside the electromagnetic coil, a fixed core fixed to the magnetic yoke to suck the movable core, a return spring for returning the movable core to an original position direction, and a return spring in the space. A magnetic plate mounted substantially at the center, and a latch mechanism that operates on the end face of the movable iron core opposite to the end face of the movable iron core that is attracted to the fixed iron core, following the operation of attracting the movable iron core to the fixed iron core. A solenoid provided with: 2. The latch mechanism according to claim 1, wherein said magnetic plate is provided on an outer periphery of said movable core, and a hollow cylindrical mounting cylinder fastened and fixed to an end surface of said movable iron core opposite to an end surface attracted by a fixed iron core. The movable core is attached to the stationary core, and the linear motion when the movable core is attracted to the fixed core is converted into an intermittent rotational motion, whereby the movable core is held and returned in the suction state. The solenoid according to claim 1, wherein: 3. The latch mechanism comprises: a hollow cylindrical mounting cylinder fastened and fixed to a movable iron core; a fixing ring fitted to the mounting cylinder and having a plurality of teeth; A support ring fitted to the mounting cylinder in a state of being fitted inside, rotatably loosely fitted to the support ring, an inner half meshing with the teeth of the fixing ring, and an outer half being a cover body A movable ring having a plurality of teeth locked by a locking block formed on the inner peripheral surface of the movable ring; and a pressing ring loosely and non-rotatably fitted to the support ring and applying a pressing force to the movable ring. When the movable core is sucked, the teeth of the movable ring are locked by the locking block on the inner peripheral surface of the cover, and when the movable core is returned, the movable core is sucked again by the fixed core to return the locking block and the movable ring. I will release the lock with the teeth 2. The method according to claim 1, wherein
Or the solenoid according to 2.