JPH07335433A - Solenoid plunger device and controlling method thereof - Google Patents

Abstract

PURPOSE:To provide a compact solenoid plunger device having a long stroke and large thrust but no possibility of burning the electromagnetic coil. CONSTITUTION:An electromagnetic coil 4 is composed of an exciting coil 41 giving the magnetomotive force required for a movable member 3 in stroke as well as a holding coil 42 giving the magnetomotive force required for the movable member 3 to be attracted on a fixing member 2 at the stroke terminal end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid device such as used for switching gears of a gear transmission mechanism, and more particularly to a long stroke solenoid device.

[0002]

2. Description of the Related Art As a conventional solenoid device of this type, generally, a fixed iron core is provided so as to be coaxially opposed to the fixed iron core. The movable iron core is provided so as to be movable for a predetermined distance to the end position, and the fixed iron core and the electromagnetic coil arranged around the movable iron core. Then, by energizing the electromagnetic coil, the opposing surfaces of the fixed iron core and the movable iron core are magnetized into N poles and S poles to generate a magnetic attraction force, and this magnetic attraction force moves the movable iron core toward the fixed iron core side. It was.

[0003]

In such a solenoid device, when the stroke is long and a large thrust is required, a large magnetomotive force is required. In the conventional solenoid device, in order to generate a large magnetomotive force, there is a method of supplying a large current to the electromagnetic coil or increasing the number of turns of the coil.

However, when a large current is passed, there is a problem of heat generation of the electromagnetic coil, and there is a risk of burning if the current is continuously applied for a long time.

When the number of turns of the coil is increased,
There is a problem that the size of the solenoid device becomes large.

For example, when a solenoid device is used as a drive device for a gear switching mechanism, the solenoid device is required to have a long stroke, and a large thrust force is required when the gears do not mesh with each other. A solenoid device having is required.

Further, in the case of such a gear switching mechanism, even if the thrust of the solenoid device is simply increased,
There was a problem that the gears did not mesh, which was a problem.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and its purpose is to:
It is an object of the present invention to provide a solenoid device that is small in size and has a long stroke and a large thrust without fear of burning the electromagnetic coil.

Another object of the present invention is to provide a method for controlling a solenoid device which can surely operate the driven side such as a gear switching mechanism.

[0010]

In order to achieve the above object, in the present invention, a fixing member and a starting end position which is provided coaxially with the fixing member and is separated from the fixing member by a predetermined distance. To the end position where the movable member is located at the end position where the movable member is located at the start position by generating a magnetic attraction force between the fixed member and the movable member. In a solenoid device having an electromagnetic coil for making a stroke up to, an electromagnetic coil for operating the electromagnetic coil to generate a necessary magnetomotive force during a stroke of the movable member, and for holding the movable member by suction on a fixed member at the end of the stroke. It is characterized by comprising a holding coil that generates a necessary magnetomotive force.

In the above solenoid device, the operating coil and the holding coil are simultaneously energized to interrupt the energization of the operating coil during the stroke, and when the stroke is completed, only the operating coil is turned off and the holding coil is energized. It is characterized in that the movable member is held at the end position by energization.

[0012]

In the solenoid device of the present invention, during the stroke, a large current is passed through the operating coil of the electromagnetic coil to generate a large magnetomotive force and attract the movable member. When the stroke ends and the movable member is attracted to the fixed member, the operation coil is de-energized, and the movable member is suction-held only by the holding coil.

Since the operating coil is energized only during the stroke, the amount of heat generated is small, and a large current can be passed to the extent that it does not burn out, and a large thrust is obtained.

On the other hand, at the stroke end position, since the distance between the fixed member and the movable member is in a contact state or a close state, a large holding force can be obtained even with a low current value, so that the holding member can be held continuously for a long time. The calorific value is small and there is no danger of burning.

In this way, by controlling the electromagnetic coil separately for the actuating coil and the holding coil, a large thrust can be obtained during the stroke even though it is small, and it can be held continuously for a long time. Becomes

Further, when a solenoid device is used as a drive device of the gear switching mechanism, a very large thrust force is required depending on the meshing of the gears, but by interrupting the energization of the operating coil, The engagement can be facilitated. In this case, since the holding coil can be energized at the same time, the holding coil has a holding force even when the actuating coil is interrupted, so that the gear can be held smoothly if a little bit is engaged.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments. FIG. 1 shows a solenoid device according to an embodiment of the present invention.

The solenoid device 1 has a schematic structure as follows: a fixed iron core 2 as a fixed member, a plunger 3 as a movable movable member provided coaxially opposite the fixed iron core 2, a fixed iron core 2 and a plunger 3. And an electromagnetic coil 4 arranged so as to surround the electromagnetic coil 4 and a case 5 that surrounds the electromagnetic coil 4 and forms a magnetic path between the fixed iron core 2 and the plunger 3 when the electromagnetic coil 4 is excited.

The fixed iron core 2 is composed of a columnar portion 21 and a disc-shaped upper plate portion 22 fixed to one end of the columnar portion 21 and projecting in the radial direction.
A frustoconical projection 23 is formed at the end portion on the side facing the plunger 3.

The plunger 3 is moved coaxially with the fixed iron core 2 in a predetermined stroke S from a start end position A which is separated from the fixed iron core 2 by a predetermined distance to an end position B where the fixed iron core 2 is sucked and held. It is possible. At the end of the plunger 3 facing the fixed core 21, a truncated cone-shaped recess 31 into which the truncated cone-shaped projection 23 of the fixed core 21 is fitted is formed. Further, the plunger 3 is integrally provided with an operating rod 32 that projects and extends to the outside on the side opposite to the axial fixed iron core 2 and is connected to the driven mechanism 6.

The electromagnetic coil 4 includes an operating coil 41 for generating a magnetomotive force required during the stroke of the plunger 3.
And a holding coil 42 for generating a magnetomotive force required to attract and hold the plunger 3 to the fixed iron core 2 at the stroke end B. This operating coil 4
1 and the holding coil 42 are arranged in series in the axial direction,
It is wound around one bobbin 43, and the outer periphery is covered with a resin mold 44. The actuating coil 41 and the holding coil 42 are independent of each other, and although not shown, lead wires extend independently, and the terminals 45 are provided with respective energizing terminals.

The case 5 is a hollow cylindrical member having a bottom, in which a plunger guide 52 is attached to a bottom 51 in which a resin mold 44 is accommodated, and an outer diameter end of the upper plate 22 of the fixed iron core 2 is fixed to an opening end 53. Has been done. Also, the bottom 5
The plunger guide 52 provided in 1 is a cylindrical member,
It is inserted and fixed to the inner circumference of the opening provided in the bottom portion 51. At the opening end of the plunger guide 52, a stopper 5 that determines the stroke start position A of the plunger 3 is provided.
5 is provided, and the operating rod 32 is inserted through a rod hole 56 provided at the center of the stopper 55.

Usually, the driven mechanism 6 is connected to the operating rod 32, and the plunger 3 is pulled and pulled toward the stroke starting end A side and pressed against the stopper 55.

A bracket 57 for mounting is fixed to the case bottom portion 51.

Next, the operation of the present invention will be described.

As shown in FIGS. 2A, 2B, and 2C, the operating coil 41 and the holding coil 42 are simultaneously energized, and
As shown in (b), when the stroke is completed by energizing for a predetermined time T, only the driving coil 41 is turned off and the holding coil 42 is energized to hold the stroke. The operation coil 41 and the holding coil 42 need not be energized at the same time as long as they are energized at least when the operation coil 41 is turned off.

During the stroke, in order to satisfy the thrust force at the beginning of pulling on the actuating coil 41, a large current is passed to generate a magnetomotive force necessary for the thrust force to complete the stroke. The operation coil 41 has a low resistance value that does not burn out until the stroke is completed.

When the stroke is completed and the plunger 3 is attracted to the fixed iron core 2, the operating coil 41
Is turned off, and the plunger 3 is sucked and held only by the holding coil 42. The holding coil 42 has a resistance value such that the holding coil 42 has a low current such that the holding coil 42 is not burned even if the stroke is continuously held for a long time.

Since the operating coil 41 is energized only during the stroke, a large current can be passed to the extent that it does not burn out, and a large thrust is obtained.

On the other hand, at the stroke end position B, since the distance between the fixed iron core 2 and the plunger 3 is in a contact state or a close state, a large holding force can be obtained even at a low current value, so that the holding is continued for a long time. However, the calorific value is small and there is no danger of burning.

By controlling the electromagnetic coil 4 by dividing it into the actuating coil 41 and the holding coil 42 in this manner, a large thrust can be obtained during the stroke while maintaining a small size, and it can be continuously held for a long time. It becomes possible.

For example, the operating coil 41 at 24 V (DC) is about 3 [Ω] at 20 [° C], and the holding coil 42 is
Is about 40 [Ω], 24 [V] is 20 [° C]
When energized under the temperature of
Is 192 [W] and the holding coil 42 is 14.4 [W].

When the resistance value of the holding coil 42 is lowered, the power consumption increases and the amount of heat generation increases, so that the resistance value is set according to the length of the holding time. 40 above
The resistance value of [Ω] is set by assuming a holding time of 1 hour or more. For example, if the resistance value is 20 [Ω], the amount of heat generation is too large, and the coil temperature makes up the coil when energized for 1 hour. The heat resistance limit of the material being used may be exceeded. The resistance value of each coil is determined in consideration of such a point.

Next, a case where a solenoid device is used as a drive device for the gear change mechanism will be described.

FIG. 3A shows a gear switching mechanism of the power transmission device. To briefly explain this mechanism, the power-side gear 61 is selectively transmitted to the driven-side transmission destination gear 63 via the biting gear 62. Power side gear 6
1 and the transmission destination gear 63 are arranged in parallel with each other with a predetermined distance therebetween, and the engagement gear 62 is arranged in the middle thereof. The biting gear 62 is movable between a power transmission position that meshes with the power-side gear 61 and the transmission destination gear 63 and a transmission release position that is separated from the power-side gear 61 and the transmission destination gear 63. The drive gear 62 is driven by the solenoid device 1 of this embodiment.

That is, the biting gear 62 is spring-biased so that it is always in the release position by the return spring 64 interposed between the biting gear 62 and the fixed surface of the device, and the return spring 64 is thrust by the solenoid device 1. The meshing gear 62 is moved to the power transmission position against the biasing force of the gears and meshes with the power side and transmission destination gears 61 and 63.

When the solenoid device 1 is used in such a mechanism, if the normal solenoid device 1 is to be operated, a very large thrust force is required depending on the meshing of the gears. As shown in (b) and (c), the engagement of the gears can be facilitated by intermittently energizing the operating coil 41.

In this case, since the holding coil 42 can be energized at the same time, the holding coil 42 has a holding force even when the actuating coil 41 is interrupted, so that the gear can be held smoothly if slightly engaged. be able to.

Such a control method is not limited to the illustrated gear switching mechanism, but can be applied to other various mechanisms in which intermittent energization is effective.

[0040]

The present invention has the above-mentioned configuration and operation, and the function of the electromagnetic coil is divided into an operating coil and a holding coil, and a large current is applied to the operating coil of the electromagnetic coil during a stroke. A large magnetomotive force is generated to attract the movable member, and when the stroke ends and the movable member is attracted to the fixed member, the operation coil is de-energized and the movable coil is attracted and held only by the holding coil. As a result, the problem of heat generation of the coil is solved, a large thrust can be obtained during the stroke while being small in size, and it can be continuously maintained for a long time.

If the operation coil is controlled so as to be intermittently energized, meshing of the gears can be facilitated.

[Brief description of drawings]

1A and 1B show a solenoid device according to an embodiment of the present invention. FIG. 1A is a vertical sectional view of a stroke start position, and FIG. 1B is a vertical sectional view of a stroke end position. is there.

FIG. 2 shows a control method of the solenoid device of FIG.

FIG. 3 (a) is a diagram showing a configuration example of a gear switching mechanism in which the solenoid device of the present invention is used, and FIGS. 3 (b) and 3 (c) show a control method for intermittently energizing an operating coil. It is a figure.

[Explanation of symbols]

 1 Solenoid Device 2 Fixed Iron Core 21 Cylindrical Part 22 Upper Plate Part 23 Projecting Part 3 Plunger 31 Recessed Part 32 Operating Rod 4 Electromagnetic Coil 41 Operating Coil 42 Holding Coil 43 Bobbin 44 Resin Mold 45 Terminal 5 Case 51 Bottom 52 Plunger Guide 53 Opening end 55 Stopper 56 Rod hole 57 Bracket A Stroke start end B Stroke end S Stroke

Claims (2)

[Claims] 1. A fixing member and a movable member which are coaxially opposed to the fixing member and are movable for a predetermined distance from a starting end position separated from the fixing member by a predetermined distance to an end position where the fixing member is suction-held. A movable member provided with the movable member and an electromagnetic coil that generates a magnetic attraction force between the fixed member and the movable member to stroke the movable member at the start end position to the end position. And a holding coil for generating a magnetomotive force necessary for adsorbing and holding the movable member to the fixed member at the end of the stroke. Solenoid device. 2. The solenoid device according to claim 1, wherein the operating coil and the holding coil are simultaneously energized to interrupt the energization of the operating coil during a stroke, and only the operating coil is turned off at the end of the stroke. Then, a method for controlling a solenoid device is characterized in that the movable member is held at the end position by energizing the holding coil.