JPH08288134A - Electromagnetic device - Google Patents

Abstract

PURPOSE: To facilitate the accurate position control of an operation lever which is formed on a movable core integrally and 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. Bearings J are 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 bearings 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 a movable core in which a coil, a fixed core and an operating rod are integrally mounted in a housing.
And an electromagnetic device comprising:
For example, it is used as an actuator that controls a valve for hydraulic control in an automatic transmission of an automobile.

[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 1 at the right end.
It is a bottomed cylindrical housing having A, and is formed by projecting a guide projection 1C having a movable core guide hole 1B from the bottom 1A toward the opening side. The opening of the housing 1 is closed by a flange-shaped yoke 2A.
In A, a first fixed core 2B protruding toward the inside of the housing 1 (right side in the drawing) and a second fixed core 2C protruding toward the outer side A (left side in the drawing) are integrally formed. It is formed. Hereinafter, a member formed by the flange-shaped yoke 2A, the first fixed core 2B, and the second fixed core 2C is simply referred to as the fixed core 2. A coil bobbin 4 around which a coil 3 is wound is housed in the outer periphery of the fixed core 2 and the guide protrusion 1C in the housing 1, and further, in the movable core guide hole 1B. A movable core 6 to which the rod 5 is integrally attached is movably arranged. One end 5A of the operating rod 5 is moved by a bearing bearing J which is located near the bottom of the guide tube portion 1C and is fitted and arranged in a bearing fitting hole 1D formed coaxially with the movable core guide hole 1B. Freely supported. The other end 5B of the operating rod 5 is fixed to the fixed core 2
Is movably supported by a bearing bearing J that is fitted and arranged in a bearing fitting hole 2D that is formed through the center of the longitudinal direction X-X. That is, the operating rod 5 has both ends 5
A and 5B are movably supported by bearing bearings J, whereby the movable core 6 is movable core guide hole 1B.
It is arranged inside and is movable back and forth toward the fixed core 2.
The outer circumference of the bearing bearing J is a bearing fitting hole 1D,
It is fitted in 2D, and the operating rod 5 is inserted into its inner hole to be rotatably supported. This bearing bearing J is used to reduce the sliding resistance of the operating rod 5 and to maintain a uniform sliding resistance, whereas the plain bearing supports the operating rod 5 as a sliding bearing. Since the bearing J supports the rolling bearing, the working resistance is smaller than that of the plain bearing.

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.) Then, the outer peripheral portion of the fixed core 2 of the electromagnetic device S (specifically, the second fixed core 2C) is guided to the guide hole 7A of the valve body 7. A linear solenoid valve is formed by inserting and arranging therein.

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. Oil pressure is supplied from the high pressure oil passage 14 to the control oil passage 12 by disconnecting 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 is also transmitted to the reaction force chamber 15 via the orifice 16. The pressing force by the hydraulic pressure and the spring force of the spring 18 act on the valve body 9 as a reaction force. Then, it is pressed 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 bearing 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 bearing bearing J has the oil sump 10
Is opened so as to face the first flow path P1 of the valve body 7 connected to.
On the other hand, in the oil sump 10, oil mist is generated during the operation of the vehicle, and this oil mist is received from the bearing fitting hole 2D of the fixed core 2 opening in the first flow path P1 to the bearing. It reaches the outer end surface J2 of the bearing J and enters between the outer periphery of the operating rod 5 and the ball of the bearing J. Here, during the oil mist generated in the oil sump 10,
For example, wear generated in the operating portion of the valve portion V,
Alternatively, it may contain contaminants (foreign matter) due to abrasion powder or the like generated in another drive unit.
When the oil mist enters between the ball and the operating rod 5, the contamination also enters at the same time. According to the above, due to contamination, ball rolling failure of the bearing bearing J occurs (ball lock), the rolling bearing becomes a sliding bearing, and the sliding resistance increases, which causes fluctuation in normal load generation. 1) Accurate position control of the operating rod in proportion to the current value cannot be obtained. (2) A good response speed of the operating rod to the current value cannot be obtained. The problem occurs.

The present invention has been made in view of the above problems,
It is a principal object of the present invention to provide an electromagnetic device capable of accurately controlling the position of the operating rod and obtaining a good response speed of the operating rod.

[0007]

[Means for Solving the Problems] In order to achieve the above object,
The present invention provides 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 bearing. , A bearing fitting hole is formed through the center of the fixed core in the longitudinal direction X-X, and a bearing bearing J is fitted and arranged in the bearing fitting hole. An annular filter member formed of a material having air permeability is fitted and arranged in the hole, and one side surface of the filter member is arranged in contact with the outer end surface of the bearing bearing to operate the insertion hole of the filter member. The first feature is that it is arranged in sliding contact with the outer peripheral surface of the rod.

According to the present invention, in addition to the first feature, one side surface of the filter member is disposed on the outer end surface of the bearing bearing with a gap, and the one side surface of the filter member is fitted into a bearing fitting hole between the filter member and the bearing bearing. A second feature is that the annular 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, the outer end of the bearing fitting hole formed in the fixed core has a diameter smaller than that of the bearing fitting hole via a reduced diameter portion. A small diameter hole with a diameter larger than the rod is formed and opens on the outer end surface of the fixed core,
The bearing is fitted in the bearing fitting hole, the filter member is arranged in the bearing fitting hole outside the bearing, and the bearing fitting hole between the outer end face of the bearing and the one side surface of the filter member is arranged in the bearing fitting hole. A third feature is that the first annular chamber is formed and the second annular chamber is formed in the bearing fitting hole between the other side surface of the filter member and the reduced diameter portion.

Further, in addition to the third feature of the present invention, the first annular chamber is opened to 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.

[0011]

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 to operate. It penetrates between the outer circumference of the rod and the ball of the bearing bearing. Since this roller bearing can be kept in a clean state at all times, the sliding resistance can be kept constant at all times.

Further, according to the second feature, since the contaminants that have passed through the filter member are once dropped and stored in the annular chamber, the contaminants are further suppressed from entering the roller 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, the contamination that enters the roller bearing is further reduced, and the roller bearing can be kept in a cleaner state.

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

[0015]

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 is omitted. FIG. 1 shows a first 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 is formed in the center portion for sliding contact with the outer periphery of the operating rod 5. To be done. The case 21 includes an outer peripheral surface 20B of the filter 20 and an outer peripheral surface 20B.
The filter 20 has a ring shape surrounding a part of the outer peripheral portion of the one side surface 20C on the side closer to B and the other side surface 20D. With the filter 20 housed in the case 21, the insertion hole 20A, the one side surface 20C, and the other side surface 20 of the filter 20.
Many parts of D should not be closed by the case 21 and should be open 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 of the outer side A of the fixed core 2 and is the second fixed core 2C in FIG. 1).
(Refer to the left end of the above) is fitted and arranged in the bearing fitting hole 2D in which the bearing bearing J is arranged. At this time, one side surface 20C of the filter member F (this one side surface corresponds to one side surface 20C of the filter 20) contacts the outer end surface J2 of the bearing bearing J, and the other side surface 2 of the filter member F
OD is in the bearing fitting hole 2D and faces the outer side A. or,
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 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 bearing bearing J arranged in the fixed core 2 to the outer circumference of the operating rod 5. The contamination is prevented from entering the roller bearing portion between the bearing bearing J and the bearing bearing J, the roller bearing state is maintained, and the sliding resistance of the operating rod is not increased. Further, even when the bearing is used for a long period of time, the rolling bearing portion of the balls of the bearing bearing J and the outer periphery of the operating rod 5 can be kept in a rolling bearing state, so that the sliding resistance of the operating rod is kept substantially constant for a long period of time. Can be held. Further, the insertion hole 20A of the filter member F is
Although it is in sliding contact with the outer peripheral surface of the operating rod 5, since the filter 20 is formed of a material having air permeability, a relatively small elastic load is applied to the operating rod 5 from the insertion hole 20A of the filter 20, It does not significantly increase the sliding resistance of the operating rod. Further, since the filter member F is formed of a material having air permeability, the oil mist from which contaminants have been removed passes through the filter member F, the bearing bearing J of the fixed core 2 and the movable core guide hole 1B, and the housing 1 Reaches the bearing receiving shaft J of. According to this, oil lubrication between the bearing 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. On the other hand, since the filter 20 has a breathing effect (breathing hole effect), it does not give any resistance to the movement of the movable core 6 and the operating rod 5.

As described above, the sliding resistance of the operating rod 5 can be stably maintained in a substantially constant rolling bearing state for a long period of time. Position control can be controlled stably 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, and when used in the hydraulic control valve as described above, it is possible to perform hydraulic control with excellent responsiveness. Since the roller bearing portion between the bearing bearing J and the operating rod 5 is always kept in a clean state, the material of the bearing bearing J and the operating rod 5 and the surface treatment can be selected very easily. A reduction in development cost can be achieved. Since the filter member F may be fitted and arranged in the bearing fitting hole 2D into which the conventional bearing bearing J is fitted, it can be implemented without changing the structure of the conventional electromagnetic device, and its implementation is easy. It can be performed and is compatible with conventional ones.

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 arranged in the bearing fitting hole 2D on the outer side A of the bearing bearing J arranged in the fixed core 2 and between the one side surface 20C of the filter member F and the outer end surface J2 of the bearing bearing J. A gap E is formed. according to this,
An annular chamber 21 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 bearing bearing J.

According to the second embodiment, when the contamination contained in the oil mist passes through the filter member F and enters the bearing J, the contamination is effectively stored in the annular chamber 21. To be done. This is because when the oil mist passes through the filter member F, the oil mist receives flow resistance due to the filter member F and the flow speed of the oil mist itself including contaminants is reduced. The flow velocity is further reduced in the annular chamber 21 having the expanded volume, and the contaminant that has entered the annular chamber 21 has its own mass, so that the contaminant falls in the direction of gravity of the annular chamber 21. It is due to. According to the above, even if the contamination passes through the filter member F, the contamination is surely stored and stored in the annular chamber 21, so that the contamination between the bearing bearing J and the operating rod 5 is stored. Intrusion toward the roller bearing is further suppressed. 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. It should be noted that the same components as those in FIG. A small-diameter hole 2F is continuously provided in the bearing fitting hole 2D formed in the fixed core 2 toward the outer end surface 2E of the fixed core 2. This small diameter part 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 bearing bearing J of the fixed core 2 and the reduced diameter portion 2G. At this time, the one side surface 20C of the filter member F and the outside of the bearing bearing J are arranged. A first gap G is formed between the end surface J2 and the other side surface 20D of the filter member F and the reduced diameter portion 2
A second gap H is formed between G and G. Thus, the first gap G and the bearing fitting hole 2D form the first annular chamber 22, and the second gap H and the bearing fitting hole 2D form the second annular chamber 23. In other words, the first annular chamber 22 is
One side 20C of the filter member F and the bearing J
Is formed in the bearing fitting hole 2D between the outer end surface J2 of the filter member F and the other side surface 20D of the filter member F.
It is formed in the bearing fitting hole 2D between 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 chamber volume in the second annular chamber 23. 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 the annular chamber 22 is separated and removed over a plurality of stages, the invasion of contaminants into the roller bearing of the bearing J is further effectively suppressed. Thus, the first
It is possible to further effectively enhance the effects exhibited by the embodiment.

A fourth 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. First annular chamber 2
A first discharge hole 24 that communicates with the outside of the fixed core 2 is opened in 2, and a second discharge hole 25 that communicates with the outside of the fixed core 2 is opened in the second annular chamber 23. In this embodiment, the first discharge hole 2
4, 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 further has the first discharge hole 2
4. A through hole 26 for opening the second discharge hole 25 into the oil sump 10 is provided.

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

[0026]

As described above, according to the first feature of the electromagnetic device of the present invention, since the rolling resistance of the operating rod can be stably maintained in a substantially constant low rolling resistance state for a long period of time, the operating rod is accurate. Position control and good response speed of the operating rod, it is possible to select bearing material, operating rod material, and surface treatment very easily, and to adapt to conventional electromagnetic devices. Can be easily achieved. 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 contaminants are separated and removed in a plurality of stages by the second annular chamber, the filter member, and the first annular chamber,
Contamination can be further suppressed in the roller bearing. Furthermore, according to the fourth feature, the first, second
Since the contaminants stored in the annular chamber are successively discharged to the outside of the fixed core through the first and second discharge holes, the contaminants can be effectively removed for a long period of time.

[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 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 J Bearing Bearing J2 Outer end face

Claims (4)

[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 bearings. In the longitudinal direction X- of the fixed core 2
A bearing fitting hole 2D is formed through the center of X, a bearing bearing J is fitted and arranged in the bearing fitting hole 2D, and a bearing fitting hole 2D on the outer side A of the bearing bearing is An annular filter member F formed of a material having air permeability is fitted and arranged, and one side surface 20C of the filter member is arranged in contact with the outer end surface J2 of the bearing bearing J, and the insertion hole 20A of the filter member F is arranged. 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 is
The bearing bearing J is arranged on the outer end surface J2 with a gap E, the annular chamber 21 is formed in the bearing fitting hole 2D between the filter member F and the bearing bearing J, and the insertion hole 20A of the filter member F is formed in the operating rod 5. The electromagnetic device according to claim 1, wherein the electromagnetic device is arranged in sliding contact with the outer peripheral surface. 3. A bearing fitting hole 2 formed in the fixed core.
A bearing fitting hole 2D is formed at the outer end of D through a reduced diameter portion 2G.
A small-diameter hole 2F having a smaller diameter and a larger diameter than the operating rod 5 is formed to open to the outer end surface 2E of the fixed core 2, and the bearing J is fitted and arranged in the bearing fitting hole 2D and is located outside the bearing bearing J. Filter member F in the bearing fitting hole 2D of
Is disposed in the bearing fitting hole 2D between the outer end surface J2 of the bearing bearing J and the one side surface 20C of the filter member F.
The annular chamber 22 is formed and a second portion is formed 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 annular chamber 23 is formed. 4. The first annular chamber is opened to the outside of the fixed core 2 through the first discharge hole 24, and the second annular chamber 23 is opened to the outside of the fixed core 2 through the second discharge hole 25. The electromagnetic device according to claim 3, wherein the electromagnetic device is opened toward the outside.