JP3952046B2 - Electromagnetic device - Google Patents

Description

  The present invention relates to an electromagnetic device including a coil, a fixed core, and a movable core in which an operating rod is integrally attached in a housing. The electromagnetic device is used for, for example, hydraulic control in an automatic transmission of an automobile. It is used as an actuator for controlling the valves.

A conventional electromagnetic device will be described with reference to FIG. In addition, this figure includes a valve portion V whose operation is controlled by an electromagnetic device.
The electromagnetic device S is configured as follows.
Reference numeral 1 denotes a bottomed cylindrical housing having an opening 1G on the left end and a bottom 1A on the right end, and a guide protrusion 1C having a movable core guide hole 1B drilled from the bottom 1A toward the opening 1G. Is formed protruding.
The opening 1G of the housing 1 is closed by a flange-shaped yoke 2A, and the yoke 2A protrudes into the housing 1 (right side in FIG. 4) and the outer side A (FIG. 6). The second fixed core 2C protruding toward the left) is integrally 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 a fixed core 2.
Further, in the housing 1, a coil bobbin 4 around which a coil 3 is wound is accommodated and disposed around the outer periphery of the first fixed core 2B and the guide protrusion 1C, and further, in the movable core guide hole 1B. The movable core 6 to which the operating rod 5 is integrally attached is movably disposed.
One end 5A of the operating rod 5 is moved by a plain bearing J that is fitted and disposed in a bearing fitting hole 1D that is formed concentrically with the movable core guide hole 1B, near the bottom of the guide tube portion 1C. It is supported freely.
Further, the other end 5B of the operating rod 5 is movable by a plain bearing J fitted and disposed in a bearing fitting hole 2D which is drilled through the center of the fixed core 2 in the longitudinal direction XX. Supported.
That is, both ends 5A and 5B of the operating rod 5 are movably supported by the plain bearing J, whereby the movable core 6 is in the movable core guide hole 1B and is advanced and retracted toward the fixed core 2. Arranged freely.
The plain bearing J has an annular shape, the outer periphery of which is fitted into the bearing fitting holes 2D and 1D, and the operating rod 5 is inserted into and supported by the inner hole J1. It is used to reduce the sliding resistance of the operating rod 5 and to maintain a uniform sliding resistance. For example, after bronze powder is burned on copper, a mixture of tetrafluoroethylene resin and lead is used. It is formed by impregnation. The vertical cross-sectional shape of the plain bearing J is shown in FIG.

The valve part V controlled by the electromagnetic device S is composed of the following. The valve body 7 is internally provided with a valve body guide hole 8 along the longitudinal direction X-X, and a guide hole 7A for guiding the solenoid part S is formed at the right end thereof. A female screw hole 7B is formed at the end. The guide hole 7 </ b> A and the female screw hole 7 </ b> B are formed concentrically with the valve element guide hole 8.
In the valve body guide hole 8, first to sixth flow paths P <b> 1 to P <b> 6 are opened from the right side in the drawing, and each of the flow paths P <b> 1 to P <b> 6 opens on the lower surface of the valve body 7.
A valve body 9 for controlling the opening of the flow path is movably disposed 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 reservoir 10 such as a transmission case of the transmission.
The second flow path P2 and the fifth flow path P5 are opened to the oil reservoir 10.
The third flow path P <b> 3 is connected to the control oil path 12 that is continuous with the hydraulic operation unit 11, and the fourth flow path P <b> 4 is connected to the high-pressure oil path 14 that is continuous with the hydraulic pressure source 13. The sixth flow path P6 communicates with the reaction force chamber 15 facing the other end of the valve body 9 and is connected to the control oil path 12 via the orifice 16. On the other hand, a 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 closed. A spring 18 for pressing the valve body is provided between them, and the valve body 9 is pressed and urged rightward in the drawing by the elastic force of the spring 18. (The spring 18 is contracted in the reaction force chamber 15). The linear solenoid is formed by inserting the outer peripheral portion of the second fixed core 2C of the electromagnetic device S into the guide hole 7A of the valve body 7. A valve is formed.

When the electromagnetic device S is energized, the valve element 9 is displaced to the left against the repulsive force of the spring 18 by the electromagnetic thrust acting on the operating rod 5 from the movable core 6. According to this, between 2nd and 3rd flow paths P2 and P3 is interrupted, and between 3rd and 4th flow paths P3 and P4 is made conductive, and hydraulic pressure is supplied to control oil path 12 from high pressure oil path 14 Is done.
Then, the hydraulic pressure is immediately supplied to the hydraulic operating section 11 and is also transmitted to the reaction force chamber 15 through 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. Acts and pushes it toward the working rod 5 side. As a result, the valve body 9 moves to the left and right so as to balance the electromagnetic thrust of the operating rod 5 and the reaction force, and supplies hydraulic pressure proportional to the current value flowing through the electromagnetic device S to the hydraulic operating portion 11. be able to.

According to such a conventional electromagnetic device, in particular, the outer end face J2 of the plain bearing J disposed in the fixed core 2 is directly directed toward the outer side A through the bearing fitting hole 2D formed in the fixed core 2. Open.
That is, the outer end face J2 of the plain bearing J opens toward the first flow path P1 of the valve body 7 connected to the oil reservoir 10.
On the other hand, in the oil reservoir 10, oil mist is generated during operation of the automobile. This oil mist is generated from the bearing fitting hole 2D of the fixed core 2 that opens to the first flow path P1 to the plain bearing J. The outer end face J2 is reached and enters a minute annular sliding gap formed between the outer periphery of the operating rod 5 and the inner hole J1 of the plain bearing J.
Here, in the oil mist generated in the oil reservoir 10, for example, wear powder generated in the operating portion of the valve portion V (the valve body guide hole 8, valve body 9) or wear powder generated in the driving portion of the engine, etc. Contamination (foreign matter) is included, and when oil mist enters the sliding gap, contamination also enters at the same time.
According to the above, due to contamination, the sliding surface between the operating rod 5 and the inner hole J1 of the plain bearing J is worn, the sliding resistance is increased, and the normal load generation fluctuation is caused by the deviation of the air gap on the magnetic path. Therefore, (1) accurate position control of the operating rod 5 proportional to the current value cannot be obtained. (2) A good response speed of the operating rod 5 with respect to the current value cannot be obtained. This causes a malfunction. Furthermore, in order to reduce the wear of the sliding surface, a great amount of development man-hour is required for selecting the working rod 5 and the plain bearing J and selecting the surface treatment.

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

In order to achieve the above object, the electromagnetic device according to the present invention houses and arranges a movable core in which a coil, a fixed core, and an operating rod are integrally attached to a bottomed cylindrical housing, and the operating rod is a fixed core. And an electromagnetic device movably supported by a plain bearing arranged in the housing,
A bearing fitting hole is formed through the center of the fixed core that closes the opening of the housing in the longitudinal direction XX, and the outer end of the bearing fitting hole is fitted with a bearing through a reduced diameter portion. A small-diameter hole that is smaller in diameter than the joint hole and larger in diameter than the working rod is formed to open to the outer end surface of the fixed core
A plain bearing is fitted and arranged in the bearing fitting hole, and a filter member is arranged in the bearing fitting hole on the outer side of the plain bearing, and the bearing fitting hole between the outer end surface of the flat bearing and one side surface of the filter member is arranged. Forming the first annular chamber, and forming the second annular chamber in the bearing fitting hole between the other side surface of the filter member and the reduced diameter portion;
The first annular chamber opens to the outer peripheral portion of the second fixed core through the first discharge hole and communicates with the through hole formed in the guide hole of the valve body, and the second annular chamber is the second The first feature is that the second fixed core opens to the outer peripheral portion of the second fixed core through the discharge hole and communicates with the through hole.

Further, the present invention provides an outer peripheral portion of the second fixed core, a guide hole of the valve main body into which the outer peripheral portion is inserted, instead of opening the first annular chamber and the second annular chamber to the through holes, respectively. A groove having a minute gap is formed between the first discharge hole and the second discharge hole toward the groove.

According to the first feature of the present invention, the contamination contained in the oil mist is removed in stages in the second annular chamber, the filter member, and the first annular chamber, so that the contamination entering the sliding gap is further reduced. The contaminants stored in the first annular chamber and the second annular chamber can be discharged from each annular chamber to the outside through the first discharge hole and the second discharge hole. Contamination does not continue to be stored in the room.
Therefore, the contamination does not enter the sliding gap of the plain bearing, and the sliding gap can be kept clean, so that the sliding resistance can be kept constant and the inner hole of the plain bearing operates. Sliding wear with the outer periphery of the ridge was greatly reduced.

  Further, according to the second feature of the present invention, since the opening ends to the outside of the first discharge hole and the second discharge hole are opened in the groove having a minute gap, the first discharge hole and the second discharge hole are formed. The flow rate of the oil mist flowing directly into the first annular chamber and the second annular chamber 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.

As described above, according to the first feature of the present invention, the contamination entering the bearing fitting hole is separated and removed in a plurality of stages by the second annular chamber, the filter member, and the first annular chamber. Since the contaminants stored in the second annular chamber are sequentially discharged out of the fixed core through the first and second discharge holes, the contaminants can be effectively removed over a long period of time.
Therefore, accurate position control of the operating rod and good response speed of the operating rod can be obtained, and the plain bearing, the selection of the material of the operating rod and the surface treatment can be selected very easily. Can be easily adapted to electromagnetic devices.
In addition, according to the second feature, it is possible to prevent a large amount of oil mist from entering the first annular chamber directly.

Hereinafter, an embodiment of an electromagnetic device according to the present invention will be described with reference to the drawings. In addition, about the same structure part as before, description is abbreviate | omitted using the same code | symbol.
FIG. 1 shows an embodiment of an electromagnetic device S of the present invention.
FIG. 2 shows a filter member F used in the electromagnetic device of the present invention.
The filter member F is formed by an annular filter 20 and a case 21 that houses and holds the outer peripheral portion of the filter 20.
The filter 20 is formed in a thick-walled annular shape by a material having air permeability such as foamed resin material, felt, sponge, fiber, and the like, and an insertion hole 20A that is slidably contacted with the outer periphery of the operating rod 5 is formed in the center portion. Is done.
The case 21 has a ring shape surrounding the outer peripheral surface 20B of the filter 20, the one side surface 20C near the outer peripheral surface 20B, and a part of the outer peripheral portion of the other side surface 20D. It is stored and arranged.
In a state where the filter 20 is housed in the case 21, the insertion hole 20A, the one side surface 20C, and most of the other side surface 20D of the filter 20 are not blocked by the case 21, and should not be opened directly. Don't be.

The electromagnetic device will be described with reference to FIG. 1. A small diameter hole 2 </ b> F is continuously provided in the bearing fitting hole 2 </ b> D formed in the fixed core 2 toward the outer end surface 2 </ b> E of the fixed core 2. The small diameter hole 2F is smaller in diameter than the bearing fitting hole 2D and larger in diameter than the operating rod 5, and the diameter of the bearing fitting hole 2D is reduced by the reduced diameter portion 2G and connected to the small diameter hole 2F. The small-diameter hole 2F opens in the outer end surface 2E of the fixed core 2.
The filter member F is fitted and disposed in the bearing fitting hole 2D between the flat bearing J of the fixed core 2 and the reduced diameter portion 2G. At this time, one side surface 20C of the filter member F and the plain bearing J The first gap G is formed between the outer end face J2 of the filter member F, and the second gap H is formed between the other side face 20D of the filter member F and the reduced diameter portion 2G.
Thus, a first annular chamber 22 is formed by the first gap G and the bearing fitting hole 2D, and a 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 of 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.
The first annular chamber 22 has a first discharge hole 24 connected to the outer peripheral portion 2K of the second fixed core 2C, and the second annular chamber 23 is connected to the outer peripheral portion 2K of the second fixed core 2C. The second discharge hole 25 is opened.
In the present embodiment, the first discharge hole 24 and the second discharge hole 25 are opened in the outer peripheral portion 2K of the second fixed core 2C, and further, the first discharge hole 24 and the second discharge hole are formed in the guide hole 7A of the valve body 7. A through hole 26 for opening the hole 25 into the oil reservoir 10 was formed.

According to the above, the oil mist enters the bearing fitting hole 2D from the small diameter hole 2F opened in the outer end surface 2E of the fixed core 2. At this time, the flow rate of the oil mist is reduced by the small-diameter hole 2F, and the flow rate is further reduced by expanding the chamber volume in the second annular chamber 23. Contaminated matter falls in the direction of gravity in the second annular chamber 23 due to its own mass and is stored in the second annular chamber 23.
The oil mist that still contains contamination enters the filter member F, and this contamination is removed by the filter member F. The oil mist that has further passed through the filter member F then enters the first annular chamber 22, and the flow rate of the oil mist is subjected to the resistance of the filter member F when passing through the filter member. And the chamber volume in the first annular chamber 22 is further increased.
According to the above, even if contamination is included in the oil mist that has passed through the filter member F, it is dropped and stored in the gravity direction of the first annular chamber 22 due to the mass of the contamination itself.
Contamination stored in the first and second annular chambers 22 and 23 is combined with oil mist or condensed liquid oil from the first and second discharge holes 24 and 25 opened in the respective chambers. Since it is sequentially discharged out of the fixed core 2, the problem that the chambers 22 and 23 are filled with contaminants is eliminated during long-term use, and the contaminants can be effectively removed over a long period of time. It is.

According to the above, the contamination contained in the oil mist is separated and removed over a plurality of stages in the second annular chamber 23, the filter member F, and the first annular chamber 22, and is removed from the first and second discharge holes 24, 25. Since it is discharged out of the fixed core 2, the sliding resistance of the operating rod 5 can be stably maintained in a substantially constant low sliding resistance state over a long period of time. (1) The operating rod proportional to the current value 5 accurate position control 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. (2) A good response speed of the operating rod 5 proportional to the current value can be obtained, and when used in a hydraulic control valve in the same manner as described above, hydraulic control with excellent responsiveness can be performed.
(3) Since the sliding gap formed between the inner hole J1 of the plain bearing J and the operating rod 5 is always kept clean, selection of the material and surface treatment of the plain bearing J and the operating rod 5 Can be carried out very easily, so that the development cost can be reduced.
(4) The filter member F can be implemented without changing the structure of the conventional electromagnetic device since it only needs to be fitted and arranged in the bearing fitting hole 2D into which the conventional plain bearing J is fitted. It can be easily implemented and is compatible with conventional ones.

A second embodiment of the electromagnetic device according to the present invention will be described with reference to FIG. In addition, about the same structure part as FIG. 1, description is abbreviate | omitted using the same code | symbol.
Reference numeral 30 denotes a groove formed in the outer peripheral portion 2K of the second fixed core 2C. The groove 30 is formed along the longitudinal direction XX with a very small groove depth in the outer peripheral portion 2K. .
On the other hand, the opening ends to the outside of the first discharge hole 24 and the second discharge hole 25 are opened in the groove 30.
In this embodiment, the second fixed core 2C is inserted into the guide hole 7A of the valve body 7. According to this, the opening to the outside of the groove 30 is blocked by the guide hole 7A. Thus, a bag groove 30 having a minute gap is formed, and an outer side A of the groove 30 opens into the oil reservoir 10.

  According to the second embodiment, the oil reservoir 10 and the first annular chamber 22 are directly connected to the groove 30 and the first discharge hole 24, and the oil mist in the oil reservoir 10 is directly connected. However, since the first discharge hole 24 is communicated with the oil reservoir 10 through the groove 30 having a minute gap, the oil mist in the oil reservoir 10 is not allowed to enter the first annular chamber 22. When entering into the annular chamber 22, the groove 30 receives a large resistance to prevent entry into the first annular chamber 22, and contamination is prevented from entering the sliding gap of the plain bearing J.

1 is a longitudinal sectional view including a valve portion showing a first embodiment of an electromagnetic device according to the present invention. The longitudinal cross-sectional view of the filter member used for FIG. The longitudinal cross-sectional view containing the valve | bulb part which shows the 2nd Example of the electromagnetic device which becomes this invention. The longitudinal cross-sectional view containing the valve | bulb part of the conventional electromagnetic device. Sectional drawing of a flat bearing.

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 20D other side 22 first annular chamber 23 second annular chamber 24 first discharge hole 25 second discharge hole 30 Groove J Plain bearing J2 Outer end face

Claims (2)

A movable core with a coil, a fixed core, and an operating rod attached integrally is housed in a cylindrical housing with a bottom, and the operating rod is movably supported by a flat bearing disposed on the fixed core and the housing. In the electromagnetic device
A bearing fitting hole 2D passes through the center of the fixed core 2 that closes the opening 1G of the housing 1 in the longitudinal direction XX, and a reduced diameter portion is formed at the outer end of the bearing fitting hole 2D. A small-diameter hole 2F having a diameter smaller than that of the bearing fitting hole 2D and larger than that of the operating rod 5 is formed through 2G and is opened to the outer end surface 2E of the fixed core 2;
The plain bearing J is fitted and arranged in the bearing fitting hole 2D, and the filter member F is arranged in the bearing fitting hole 2D on the outer side of the flat bearing J. The outer end face J2 of the plain bearing J and one side surface 20C of the filter member F are arranged. The first annular chamber 22 is formed in the bearing fitting hole 2D between the second annular chamber 23 and the second annular chamber 23 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 first annular chamber 22 opens through the first discharge hole 24 toward the outer peripheral portion 2K of the second fixed core 2C and communicates with the through hole 26 formed in the guide hole 7A of the valve body 7. An electromagnetic device characterized in that the second annular chamber 23 opens toward the outer peripheral portion 2K of the second fixed core 2C through the second discharge hole 25 and communicates with the through hole 26. A movable core with a coil, a fixed core, and an operating rod attached integrally is housed in a cylindrical housing with a bottom, and the operating rod is movably supported by a flat bearing disposed on the fixed core and the housing. In the electromagnetic device
A bearing fitting hole 2D is formed through the center of the fixed core 2 that closes the opening 1G of the housing 1 in the longitudinal direction XX, and a reduced diameter portion is formed at the outer end of the bearing fitting hole 2D. A small-diameter hole 2F having a diameter smaller than that of the bearing fitting hole 2D and larger than that of the operating rod 5 is formed through 2G and is opened to the outer end surface 2E of the fixed core 2;
The plain bearing J is fitted and arranged in the bearing fitting hole 2D, and the filter member F is arranged in the bearing fitting hole 2D on the outer side of the flat bearing J. The outer end face J2 of the plain bearing J and one side surface 20C of the filter member F are arranged. The first annular chamber 22 is formed in the bearing fitting hole 2D between the second annular chamber 23 and the second annular chamber 23 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 first annular chamber 22 is opened through the first discharge hole 24 toward the outer peripheral portion 2K of the second fixed core 2C, and the second annular chamber 23 is opened through the second discharge hole 25 to the second fixed core. A groove 30 that opens toward the outer peripheral portion 2K of 2C and has a minute gap between the outer peripheral portion 2K of the second fixed core 2C and the guide hole 7A of the valve body 7 into which the outer peripheral portion 2K is inserted. An electromagnetic device, wherein the first discharge hole 24 and the second discharge hole 25 are opened toward the groove 30.

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