JPH08288132A - Electromagnetic device - Google Patents

Abstract

PURPOSE: To facilitate the accurate position control of an operation lever which is formed on a movable core integrally arid achieve the satisfactory response speed of the operation lever. CONSTITUTION: A bearing mating hole 2D is drilled through the center part of the longitudinal direction of a fixed core 2. A plain bearing J is mated in the bearing mating hole 2D. An annular filter member F made of gas permeable material is fitted to the A side outer from the plain bearing J inside the bearing mating hole 2D.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic device provided with a coil, a fixed core, and a movable core integrally attached with an operating rod in a housing. It is used as an actuator that controls a valve for hydraulic control in an automatic transmission.

[0002]

2. Description of the Related Art A conventional electromagnetic device will be described with reference to FIG. It should be noted that the present drawing includes a valve portion V whose operation is controlled by an electromagnetic device. The electromagnetic device S is configured by the following. 1 has an open left end and a bottom 1A at the right end
Is a bottomed cylindrical housing having a bottom, and a guide projection 1C having a movable core guide hole 1B is formed to project from the bottom 1A toward the opening side. The opening of the housing 1 is closed by a flange-shaped yoke 2A.
Includes a first fixed core 2B protruding toward the inside of the housing 1 (right side in FIG. 7) and a second fixed core 2C protruding toward the outer side A (left side in FIG. 7). Is formed. Hereinafter, the flange-shaped yoke 2A, the first
The member formed by the fixed core 2B and the second fixed core 2C is simply referred to as the fixed core 2. Further, in the housing 1, on the outer periphery of the fixed core 2 and the guide protrusion 1C,
A coil bobbin 4 around which a coil 3 is wound is housed and arranged, and a movable core 6 integrally attached with an operating rod 5 is movably arranged in the movable core guide hole 1B. One end 5A of the operating rod 5 is moved by a plain bearing J which is located in the vicinity of the bottom of the guide cylinder portion 1C and is fitted and arranged in a bearing fitting hole 1D formed coaxially with the movable core guide hole 1B. Freely supported. Further, the other end 5B of the operating rod 5 is movable by a plain bearing J fitted and arranged in a bearing fitting hole 2D which is bored through the center of the fixed core 2 in the longitudinal direction XX. Supported.
That is, both ends 5A, 5B of the operating rod 5 are movably supported by the plain bearings J, whereby the movable core 6 is moved forward and backward toward the fixed core 2 in the movable core guide hole 1B. Arranged freely. This plain bearing J has an annular shape, and its outer periphery is fitted in the bearing fitting holes 2D, 1D,
The operating rod 5 is inserted into and supported by the inner hole J1, and the plain bearing J is used for reducing the sliding resistance of the operating rod 5 and for maintaining a uniform sliding resistance. Then, for example, it is formed by burning bronze powder on copper and then impregnating a mixture of tetrafluoroethylene resin and lead. The vertical sectional shape of the plain bearing J is shown in FIG.

The valve section V controlled by the electromagnetic device S is composed of the following. The valve body 7 has a longitudinal direction X-
A valve body guide hole 8 is formed along X, and at the right end thereof,
A guide hole 7A for guiding the solenoid portion S is formed,
A female screw hole 7B is formed at the left end. The guide hole 7A and the female screw hole 7B are formed concentrically with the valve body guide hole 8. In the valve body guide hole 8, first to sixth flow paths P1 to P6 are opened from the right side in the figure, and the flow paths P1 to P6 are formed.
P6 opens on the lower surface of the valve body 7. A valve body 9 for controlling the opening of the flow path is movably arranged in the valve body guide hole 8. The first flow path P1 is formed so as to accommodate one end of the valve body 9 and is opened to an oil sump 10 such as a transmission case of a transmission. Second flow path P2, fifth flow path P5
Is opened to the oil sump 10. The third flow passage P3 is connected to the control oil passage 12 connected to the hydraulic pressure actuating portion 11, and is connected to the fourth flow passage P3.
4 is connected to a high-pressure oil passage 14 connected to the hydraulic power source 13.
In addition, the sixth flow path P6 is provided with the reaction force chamber 15 facing the other end of the valve body 9.
To the control oil passage 1 via the orifice 16
Connected to 2. On the other hand, the spring adjusting screw 17 is screwed into the female screw hole 7B formed at the left end of the valve body 9 to close the female screw hole 7B. The spring adjusting screw 17 and the other end of the valve body 9 are connected to each other. A spring 18 that presses the valve element is provided in between, and the valve element 9 is pressed and biased rightward in the figure by the elastic force of the spring 18. (The spring 18 is contracted in the reaction force chamber 15)
A linear solenoid valve is formed by inserting and arranging the outer peripheral portion of the fixed core 2 of the electromagnetic device S (specifically, the second fixed core 2C) into the guide hole 7A of the valve body 7.

When the electromagnetic device S is energized, the electromagnetic thrust acting on the operating rod 5 from the movable core 6 causes the valve body 9 to move to the left against the repulsive force of the spring 18, and the second and third flows are generated. The hydraulic pressure is supplied from the high pressure oil passage 14 to the control oil passage 12 by blocking the passages P2 and P3 and connecting the third and fourth passages P3 and P4. The hydraulic pressure is immediately supplied to the hydraulic operating unit 11 and also transmitted to the reaction force chamber 15 via the orifice 16, and the pressing force by the hydraulic pressure and the spring force of the spring 18 are applied to the valve body 9 as a reaction force. It acts and pushes it toward the operating rod 5. As a result, the valve body 9
Moves left and right so as to balance the electromagnetic thrust of the operating rod 5 with the reaction force, and the hydraulic pressure operating portion 11 can be supplied with a hydraulic pressure proportional to the current value flowing in the electromagnetic device S.

[0005]

According to such a conventional electromagnetic device, in particular, the outer end surface J2 of the plain bearing J arranged in the fixed core 2 is inserted through the bearing fitting hole 2D formed in the fixed core 2. Open directly to the outside A. That is, the outer end surface J2 of the plain bearing J faces the first flow path P1 of the valve body 7 connected to the oil reservoir 10 and opens. On the other hand, in the oil sump 10, oil mist is generated during the operation of the automobile, and this oil mist is discharged from the bearing fitting hole 2D of the fixed core 2 opening in the first flow path P1 to the plain bearing J. To the outer end surface J2 of the working rod 5 and penetrates into a small annular sliding gap formed between the outer periphery of the operating rod 5 and the inner hole J1 of the plain bearing J. Here, the oil mist generated in the oil reservoir 10 contains contaminants (foreign matter) due to, for example, abrasion powder generated in the operating portion of the valve portion V or abrasion powder generated in other drive portions, When the oil mist enters the sliding gap, the contaminants also enter at the same time. According to the above, the operating rod 5 is
Since the sliding surface between the bearing and the inner hole J1 of the plain bearing J is abraded, the sliding resistance increases, and the normal load generation fluctuation due to the deviation of the air gap on the magnetic path occurs. Accurate position control of the proportional operating rod cannot be obtained.
(2) A good response speed of the operating rod to the current value cannot be obtained. The problem occurs. Further, in order to reduce the wear of the sliding surface, a great number of development man-hours are required for the selection of the material of the operating rod, the plain bearing and the surface treatment.

The present invention has been made in view of the above problems,
It is a main object to provide an electromagnetic device capable of obtaining accurate position control of the operating rod and excellent response speed of the operating rod.

[0007]

[Means for Achieving the Object] In order to achieve the above object,
The present invention includes a bottomed tubular housing, a coil, a fixed core,
In an electromagnetic device in which a movable core to which an operating rod is integrally attached is housed and arranged, and the operating rod is movably supported by a plain bearing, a bearing fitting hole penetrates through the center of the fixed core in the longitudinal direction. And a plain bearing is fitted and arranged in the bearing fitting hole, and an annular filter member made of a material having air permeability is fitted and arranged in the bearing fitting hole outside the plain bearing. The first feature is that one side surface of the filter member is arranged in contact with the outer end surface of the plain bearing, and the insertion hole of the filter member is arranged in sliding contact with the outer peripheral surface of the operating rod.

According to the present invention, in addition to the first feature, one side surface of the filter member is arranged on the outer end surface of the plain bearing with a gap, and the ring is formed in a bearing fitting hole between the filter member and the plain bearing. A second feature is that the chamber is formed and the insertion hole of the filter member is arranged in sliding contact with the outer peripheral surface of the operating rod.

In addition to the first feature of the present invention, at the outer end of the bearing fitting hole formed in the fixed core, a diameter smaller than that of the bearing fitting hole is provided through the reduced diameter portion, and the outer diameter of the operating rod is smaller. A small diameter hole with a large diameter is formed and opens on the outer end surface of the fixed core.The plain bearing is fitted in the bearing fitting hole and the filter member is placed in the bearing fitting hole on the outer side of the plain bearing. A first annular chamber is formed in the bearing fitting hole between the outer end surface of the bearing and one side surface of the filter member, and a second annular chamber is formed in the bearing fitting hole between the other side surface of the filter member and the reduced diameter portion. Is formed as a third characteristic.

In addition to the third feature of the present invention, the first annular chamber is opened toward the outside of the fixed core through the first discharge hole, and the second annular chamber is opened through the second discharge hole. The fourth characteristic is that the opening is made to the outside of the fixed core.

In addition to the fourth feature of the present invention, the opening ends of the first discharge hole and the second discharge hole to the outside are provided with an outer peripheral surface of the fixed core and a guide hole surrounding the outer peripheral surface. Formed between
The fifth characteristic is that the openings are formed in the grooves having a minute gap.

[0012]

According to the first feature, the oil mist containing contaminants that enter the bearing fitting hole that opens outward is removed by the filter member, while the oil mist passes through the filter member. It penetrates into the annular sliding gap between the inner hole of the plain bearing and the outer circumference of the operating rod. Therefore,
Since the sliding gap can always be kept in a clean state, the sliding resistance can be always kept constant and sliding wear between the inner hole of the plain bearing and the outer circumference of the operating rod can be greatly reduced.

Further, according to the second feature, since the contaminants that have passed through the filter member once fall into the annular chamber and are stored therein, the contaminants are further suppressed from entering the sliding gap of the plain bearing.

Further, according to the third feature, the contamination contained in the oil mist is caused by the second annular chamber, the filter member,
Since it is removed stepwise in the first annular chamber, contamination entering the sliding gap is further reduced, and the sliding gap can be maintained in a cleaner state.

According to the fourth feature, the contaminants stored in the first annular chamber and the second annular chamber are discharged to the outside from the annular chamber through the first discharge hole and the second discharge hole. Contamination is not continuously stored in the annular chamber during long-term use.

According to the fifth feature, since the opening ends of the first discharge hole and the second discharge hole to the outside are opened in the groove having the minute gap, the first discharge hole and the second discharge hole are formed. The flow velocity of the oil mist directly flowing into the first annular chamber and the second annular chamber via the can be reduced. Therefore, in particular, contamination contained in the oil mist flowing into the first annular chamber from the first discharge hole is prevented from entering the sliding gap of the plain bearing.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electromagnetic device according to the present invention will be described below with reference to the drawings. Incidentally, the same reference numerals are used for the same structural parts as the conventional one, and the description thereof will be omitted. FIG. 1 shows an embodiment of an electromagnetic device S of the present invention. Further, FIG. 2 shows a filter member F used in the electromagnetic device of the present invention. The filter member F is formed of an annular filter 20 and a case 21 that houses and holds the outer peripheral portion of the filter 20. The filter 20 is made of a material having air permeability such as a foamed resin material, felt, sponge, or fibrous material, and is formed in a thick ring shape.
An insertion hole 20A that is slidably contacted with the outer periphery of the is formed. Case 2
1 is the outer peripheral surface 20B of the filter 20 and the outer peripheral surface 20B.
It has a ring shape surrounding a part of the outer peripheral portion of the one side surface 20C and the other side surface 20D on the side close to, and the filter 20 is housed in this case 21. With the filter 20 housed in the case 21, the insertion hole 20A, the one side surface 20C, and the other side surface 20D of the filter 20.
Most of the parts should not be closed by the case 21 and should be opened directly.

The filter member F has an outer end surface 2E of the fixed core 2 (the outer end surface 2E is an end portion on the outer side A of the fixed core 2 and is the second fixed core 2 in FIG. 1).
(The left end of C) is fitted and arranged in the bearing fitting hole 2D in which the plain bearing J is arranged. At this time, the filter member F
One side surface 20C (this one side surface corresponds to one side surface 20C of the filter 20) is in contact with the outer end surface J2 of the plain bearing J, and the other side surface 20D of the filter member F is in the bearing fitting hole 2D. Face outward A. Further, the insertion hole 20A of the filter member F (this insertion hole corresponds to the insertion hole 20A of the filter 20) is brought into sliding contact with the outer peripheral surface of the operating rod 5.

According to the above, when the oil mist generated in the oil sump 10 enters into the bearing fitting hole 2D opening in the outer end surface 2E of the fixed core 2, the other side surface 20 of the filter 20.
D, the thick portion of the filter 20, and the one side surface 20C of the filter 20 remove contaminants contained in the oil mist. Therefore, from the outer end surface J2 of the plain bearing J arranged in the fixed core 2 to the plain bearing J This prevents contaminants from entering the annular sliding gap formed between the inner hole J1 and the outer peripheral surface of the operating rod 5, and does not increase the sliding resistance of the operating rod. Further, even when it is used for a long period of time, wear of the sliding portion between the inner hole J1 of the plain bearing J and the outer peripheral surface of the operating rod 5 can be largely suppressed, and the sliding resistance of the operating rod can be increased. It can be held almost constant over a period of time.
Further, the insertion hole 20A of the filter member F is in sliding contact with the outer peripheral surface of the operating rod 5, but since the filter 20 is formed of a material having air permeability, a relatively small elastic load causes the insertion hole of the filter 20. Since it is added to the operating rod 5 from 20A, the sliding resistance of the operating rod is not significantly increased. Further, since the filter member F is formed of a material having air permeability, the oil mist from which the contaminants have been removed passes through the filter member F, the plain bearing J of the fixed core 2 and the movable core guide hole 1B, and the oil mist of the housing 1 is removed. Reach plain bearing J. According to this, oil lubrication between the plain bearing J of the housing 1 and the operating rod 5 is favorably performed, and the sliding resistance of the operating rod 5 can be reduced. Furthermore, when the movable core 6 reciprocates, the volume of the chamber in which the movable core 6 is housed, for example, the volume of the chamber in the movable core guide hole 1B increases or decreases, and the pressure in the chamber changes. In contrast, filter 20
Has a breathing effect (breathing hole effect), and does not provide any resistance to the movement of the movable core 6 and the operating rod 5.

As described above, since the sliding resistance of the operating rod 5 can be stably maintained in a substantially constant low sliding resistance state for a long period of time, the operating rod 5 proportional to the current value is obtained.
The accurate position control of can be stably controlled over a long period of time. Thus, when such an electromagnetic device is used as an actuator for driving a hydraulic control valve, accurate hydraulic control proportional to the current value can be performed. It is possible to obtain a good response speed of the operating rod 5 proportional to the current value.
When used in the hydraulic control valve in the same manner as described above, hydraulic control with excellent responsiveness can be performed. Inner hole J1 of plain bearing J
Since the sliding gap formed between the operating rod 5 and the operating rod 5 is always kept in a clean state, the material of the plain bearing J, the operating rod 5,
Since the surface treatment can be selected very easily, the development cost can be reduced. Since the filter member F may be fitted and disposed in the bearing fitting hole 2D into which the conventional plain bearing J is fitted, it can be implemented without changing the structure of the conventional electromagnetic device, and its implementation is easy. It is compatible with conventional products.

A second embodiment of the electromagnetic device of the present invention will be described with reference to FIG. It should be noted that the same components as those in FIG. The filter member F is located outside the plain bearing J arranged on the fixed core 2 A
And a gap E is formed between the one side surface 20C of the filter member F and the outer end surface J2 of the plain bearing J. According to this, the filter member F
The annular chamber 21 is formed in the bearing fitting hole 2D between the one side surface 20C and the outer end surface J2 of the plain bearing J.

According to the second embodiment, when the contamination contained in the oil mist passes through the filter member F and enters the plain bearing J side, the contamination is generated in the annular chamber 2.
It is effectively stored in 1. This is the filter member F
When the oil mist passes through the filter mist, the oil mist receives flow resistance by the filter member F and the flow velocity of the oil mist itself including contamination decreases, and the oil mist that has passed through the filter member F has an annular shape with an expanded chamber volume. This is because the flow velocity further decreases in the chamber 21, and the Kotam which has entered the annular chamber 21 has a mass by itself so that the contaminants fall toward the direction of gravity of the annular chamber 21. According to the above, even if the contamination passes through the filter member F,
Since the contamination is certainly stored and stored in the annular chamber 21, the contamination is further suppressed from entering toward the sliding gap of the plain bearing J. Thus, the effect of the first embodiment can be enhanced more effectively.

A third embodiment of the electromagnetic device of the present invention will be described with reference to FIG. Note that the same reference numerals are used for the same structural parts as in FIG. In the bearing fitting hole 2D formed in the fixed core 2, the outer end surface 2 of the fixed core 2 is formed.
Small-diameter holes 2F are continuously provided toward E. This small diameter hole 2F
Is smaller in diameter than the bearing fitting hole 2D and larger than the operating rod 5. The bearing fitting hole 2D is reduced in diameter by the reduced diameter portion 2G and is connected to the small diameter hole 2F. 2F opens to the outer end surface 2E of the fixed core 2. And
The filter member F is fitted and arranged in the bearing fitting hole 2D between the plain bearing J of the fixed core 2 and the reduced diameter portion 2G.
At this time, the first gap G is formed between the one side surface 20C of the filter member F and the outer end surface J2 of the plain bearing J, and the second gap H is formed between the other side surface 20D of the filter member F and the reduced diameter portion 2G. It is formed. Thus, the first gap G and the bearing fitting hole 2
The first annular chamber 22 is formed by D and the second annular chamber 23 is formed by the second gap H and the bearing fitting hole 2D. In other words, the first annular chamber 22 is formed in the bearing fitting hole 2D between the one side surface 20C of the filter member F and the outer end surface J2 of the plain bearing J, and the second annular chamber 23 is formed in the filter member F. It is formed in the bearing fitting hole 2D between the other side surface 20D and the reduced diameter portion 2G.

According to the third embodiment, the oil mist has a small diameter hole 2F which is opened in the outer end surface 2E of the fixed core 2.
Penetrates into the bearing fitting hole 2D. At this time, the flow velocity of the oil mist is reduced by the small diameter hole 2F, and the flow velocity is further reduced by increasing the volume of the chamber in the second annular chamber 23, so that the oil mist is reduced in the oil mist. The contained contaminants fall in the direction of gravity in the second annular chamber 23 due to the mass of the contaminants themselves, and are stored in the second annular chamber 23. The oil mist that still contains contaminants enters the filter member F, and this contaminant is removed by the filter member F. The oil mist that has passed through the filter member F then enters the first annular chamber 22, and the flow velocity of this oil mist is subject to the resistance of the filter member F when passing through the filter member. , And the volume of the chamber in the first annular chamber 22 is increased, which further reduces the volume. According to the above, even if contaminants are contained in the oil mist that has passed through the filter member F, due to the mass of the contaminants themselves, they fall in the gravity direction of the first annular chamber 22 and are stored.

According to the above, the contamination contained in the oil mist is the second annular chamber 23, the filter member F, the first
Since it is separated and removed in a plurality of stages in the annular chamber 22, the intrusion of contaminants into the sliding gap of the plain bearing J is more effectively suppressed. Thus, the effect of the first embodiment can be enhanced even more effectively.

Next, a fourth embodiment will be described with reference to FIG. The same reference numerals are used for the same structural parts as in FIG. The fixed core 2 is provided in the first annular chamber 22.
The first discharge hole 24 communicating with the outside of the
A second discharge hole 25 communicating with the outside of the fixed core 2 is opened at 3. In this embodiment, the first discharge hole 24 and the second discharge hole 25
Is opened on the outer side surface of the second fixed core 2C, and the guide hole 7A of the valve body 7 is further formed with a through hole 26 for opening the first discharge hole 24 and the second discharge hole 25 into the oil sump 10. Was set up.

According to the above, the first and second annular chambers 22 and 2 are
The contaminants stored in 3 are sequentially discharged from the fixed core 2 together with the oil mist or the condensed and liquefied oil from the first and second discharge holes 24 and 25 opening in the respective chambers. The problem that the chambers 22 and 23 are filled with contaminants when used for a long period of time is solved, and the contaminants can be effectively removed for a long period of time.

A fifth embodiment of the electromagnetic device of the present invention will be described with reference to FIG. The same reference numerals are used for the same structural parts as in FIG. 30 is the second
The groove 30 is formed in the outer peripheral surface 2J of the fixed core 2C, and the groove 30 is formed along the longitudinal direction XX with an extremely small groove depth from the outer peripheral surface 2J. On the other hand, the open ends of the first discharge hole 24 and the second discharge hole 25 to the outside are formed in the groove 3
Opened in 0. Then, this second fixed core 2C
In the present embodiment, is inserted and arranged in the guide hole 7A of the valve body 7. According to this, the opening of the groove 30 to the outside is closed by the guide hole 7A, and the bag groove 30 having a minute gap is formed. The outer side A of the groove 30 opens into the oil sump 10.

According to the fifth embodiment, the inside of the oil sump 10 and the first annular chamber 22 are directly connected to the groove 30 and the first discharge hole 24. Is to directly enter the first annular chamber 22, but since the first discharge hole 24 communicates with the oil sump 10 via the groove 30 having a minute gap, the oil mist in the oil sump 10 is When entering into the first annular chamber 22, the groove 30 receives a large resistance and can prevent the entering into the first annular chamber 22, so that contamination can enter the sliding gap of the plain bearing J. Be deterred.

[0030]

As described above, according to the first feature of the electromagnetic device of the present invention, the sliding resistance of the operating rod can be stably maintained in a substantially constant low sliding resistance state for a long period of time. Accurate position control and a good response speed of the operating rod can be obtained, the selection of the material of the plain bearing, the operating rod, and the surface treatment can be performed very easily. Adaptation can be facilitated. Further, according to the second feature, the contaminants that have passed through the filter member are more reliably removed by the annular chamber, and it is possible to further prevent the contaminants from entering the sliding gap. Therefore, the effect of the first feature is obtained. Was further improved. Further, according to the third feature, the contamination is separated and removed in a plurality of stages by the second annular chamber, the filter member, and the first annular chamber, so that the contamination can be further prevented from entering the sliding gap. You can Further, according to the fourth feature, the contaminants stored in the first and second annular chambers are sequentially discharged to the outside of the fixed core through the first and second discharge holes, so that the contamination is effective for a long period of time. Can be removed. Furthermore, according to the fifth feature, in particular, a large amount of oil mist is prevented from directly entering the first annular chamber.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view including a valve portion showing a first embodiment of an electromagnetic device according to the present invention.

FIG. 2 is a vertical cross-sectional view of the filter member used in FIG.

FIG. 3 is a vertical sectional view including a valve portion showing a second embodiment of the electromagnetic device according to the present invention.

FIG. 4 is a vertical sectional view including a valve portion showing a third embodiment of the electromagnetic device according to the present invention.

FIG. 5 is a vertical sectional view including a valve portion showing a fourth embodiment of the electromagnetic device according to the present invention.

FIG. 6 is a vertical sectional view including a valve portion showing a fifth embodiment of an electromagnetic device according to the present invention.

FIG. 7 is a vertical sectional view of a plain bearing.

FIG. 8 is a vertical sectional view including a valve portion of a conventional electromagnetic device.

[Explanation of symbols]

 2 fixed core 2D bearing fitting hole 2E outer end surface 2F small diameter hole 2G reduced diameter portion 20 filter 20A insertion hole 20C one side surface 20D other side surface 22 first annular chamber 23 second annular chamber 24 first discharge hole 25 second discharge hole 30 Groove J Plain bearing J2 Outer end surface

Claims (5)

[Claims] 1. An electromagnetic device in which a coil, a fixed core, and a movable core to which an operating rod is integrally attached are housed and arranged in a bottomed cylindrical housing, and the operating rod is movably supported by a plain bearing. In the longitudinal direction X- of the fixed core 2
A bearing fitting hole 2D is formed through the center of X, and a plain bearing J is fitted and arranged in the bearing fitting hole 2D. An annular filter member F formed of a material having air permeability is fitted and disposed, and one side surface 20C of the filter member is disposed in contact with the outer end surface J2 of the plain bearing J, and the insertion hole 20A of the filter member F is disposed. The electromagnetic device is characterized in that it is arranged in sliding contact with the outer peripheral surface of the operating rod 5. 2. A side surface 20C of the filter member.
Are arranged on the outer end surface J2 of the plain bearing J with a gap E,
An annular chamber 21 is formed in the bearing fitting hole 2D between the filter member F and the plain bearing J, and the insertion hole 20A of the filter member F is arranged in sliding contact with the outer peripheral surface of the operating rod 5. Item 1. The electromagnetic device according to item 1. 3. The bearing fitting hole 2 at the outer end of the bearing fitting hole 2D formed in the fixed core via a reduced diameter portion 2G.
A small-diameter hole 2F having a diameter smaller than D and larger than the operating rod 5 is formed to open to the outer end surface 2E of the fixed core 2, and the plain bearing J
Is fitted in the bearing fitting hole 2D, and the filter member F is arranged in the bearing fitting hole 2D outside the plain bearing J.
The outer end surface J2 of the plain bearing J and the one side surface 2 of the filter member F
The first annular chamber 22 is formed in the bearing fitting hole 2D between 0C and the second annular chamber 23 in the bearing fitting hole 2D between the other side surface 20D of the filter member F and the reduced diameter portion 2G. The electromagnetic device according to claim 1, wherein the electromagnetic device is formed. 4. The first annular chamber is opened toward the outside of the fixed core 2 through the first discharge hole 24, and the second annular chamber 23 is opened.
The electromagnetic device according to claim 3, wherein the electromagnetic wave is opened toward the outside of the fixed core 2 through the second discharge hole 25. 5. A minute gap is formed between the outer peripheral surface of the fixed core 2 and the guide hole 7A that surrounds the outer peripheral surface of the first discharge hole and the second discharge hole 25. The electromagnetic device according to claim 4, wherein the electromagnetic device has an opening in a groove 30 having a groove.