JP2008089080A - Electromagnetic driving device and solenoid valve using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and high-performance solenoid valve through the adoption of an electromagnetic driving device 5 having a simple structure without increasing cost. <P>SOLUTION: A solenoid valve 1 is provided with a plunger 6, an accommodation part 14 for accommodating the plunger 6 so as to be freely reciprocable, an attraction part 22 in which magnetic force for attracting the plunger 6 to one side in the reciprocating direction works between the attraction part 22 and plunger 6, a core stator 15 for forming a magnetic circuit with the plunger 6 and a solenoid 2 for producing magnetic force for attracting the plunger 6 to the attraction part 22 through energization. The plunger 6 is arranged so as to be coaxially opposite to the attraction part 22. An electromagnetic driving device 5 which keeps two slide rings 11 shaped in a partial annulus by a non-magnetic material are mounted on an outer peripheral surface is adopted. The solenoid valve 1 is equipped with a spool 3 which is interlocked with the plunger 6 to reciprocate in a sleeve 8 having a plurality of ports 7 passing through a cylindrical peripheral wall and which controls a flow rate or pressure of hydraulic fluid by opening/closing the port 7 and with a spring 9 for biasing the spool 3 to the other side in the reciprocating direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electromagnetic drive device configured to drive a fixed core and a magnetic circuit that accommodate a mover in a reciprocating manner, and an electromagnetic valve using the same.

  Conventionally, flow paths are switched and opened and closed by using an electromagnetic valve in which a valve element is driven in conjunction with an electromagnetic drive device that drives a mover in the axial direction by a magnetic force from a solenoid. ) Is controlled to a predetermined flow rate and pressure. This solenoid valve is used in, for example, control of the hydraulic pressure of hydraulic oil supplied to a hydraulic control device of an automatic transmission for automobiles, a variable valve timing device that varies the advance phase of a camshaft of an internal combustion engine by hydraulic pressure, and the like. .

[Conventional technology]
The conventional solenoid valve attracts the plunger in one of the reciprocating directions by a suction force, an accommodating portion for accommodating the plunger of the fixed core (core stator) that constitutes the plunger and the magnetic circuit, and a plunger. An electromagnetic drive device that forms a suction portion that drives and receives a magnetic force (magnetic flux) of a solenoid, and a valve body portion that drives a valve body (spool) in conjunction with the drive of the electromagnetic drive device.

  In the electromagnetic drive device, the gap formed in the radial direction orthogonal to the reciprocating direction between the plunger and the accommodating portion is reduced, the magnetic flux flowing in the magnetic circuit formed by the accommodating portion and the plunger is increased, and the plunger In order to increase the suction force acting between the suction portion and the suction portion, the plunger and the suction portion are arranged facing each other in the axial direction. As a result, a small and high performance solenoid valve with a small gap and a large suction force can be realized, and a substantially constant suction force can be obtained regardless of the displacement amount of the plunger, and a stable control performance can be ensured. A valve can be realized.

  In such a solenoid valve, if a gap (referred to as a side gap) formed radially between the inner peripheral side of the housing portion and the outer peripheral side of the plunger is eccentric with respect to the housing portion when the plunger reciprocates, As a result, the force that draws the plunger in the radial direction of the accommodating portion (referred to as side force) increases, and the sliding resistance generated between the plunger and the accommodating portion increases.

  Further, when the current value supplied to the solenoid is increased, the magnetic force increases, the side force increases, and the sliding resistance also increases. Therefore, the hysteresis of the reciprocating position of the plunger increases with respect to the current value in the increase / decrease direction of the current supplied to the solenoid. When an electromagnetic valve having a large hysteresis is used in a hydraulic control device or the like, there arises a problem that the flow rate or hydraulic pressure of the hydraulic oil is different between the increasing direction and decreasing direction of the current with respect to the same current value, that is, the hydraulic pressure cannot be controlled with high accuracy.

  Therefore, as a solenoid valve that can reduce the hysteresis of the reciprocating position of the plunger with respect to the current value supplied to the solenoid and can be downsized, the outer periphery generally forms a relief that avoids contact with the entire outer peripheral surface of the plunger. There is an undercut on the surface. Adopting this annular groove undercut is relatively easy because it can be formed by machining the outer peripheral surface of the plunger, but by undercutting part of the outer peripheral surface, the magnetic gap in the radial direction of the plunger Becomes relatively large, which influences the tendency to reduce the suction force of the plunger. Therefore, in order to prevent the attraction force from being lowered, it is necessary to close (decrease) the radial gap other than the undercut portion, and there is a concern that the processing accuracy and assembly accuracy management become strict and the cost increases.

  Further, in particular, the inner peripheral side of the accommodating portion and the outer peripheral side of the plunger are respectively coated with a resin coating of a nonmagnetic material or nickel-phosphorus (NiP) plating, and the eccentricity with respect to the accommodating portion of the plunger is 20% or more, 60 An electromagnetic valve is disclosed in which the hysteresis is reduced by a structure in which the suction portion is magnetically saturated when the current value supplied to the solenoid is increased to approximately 50% of the maximum current value, and the suction portion is magnetically saturated (Patent Document). 1).

The electromagnetic valve disclosed in Patent Document 1 is a spool-type hydraulic control valve that is applied to control the hydraulic pressure of hydraulic fluid supplied to the hydraulic control device of an automatic transmission for automobiles.
In such a solenoid valve, even if the current value to be supplied to the solenoid is increased to 50% or more of the maximum current value, the side force is suppressed from increasing. The upper limit value of the side force can be reduced, and the upper limit value of the sliding resistance acting between the accommodating portion and the plunger can be reduced. Therefore, the plunger and the spool are reciprocated at the same current value in the increase / decrease direction of the current supplied to the solenoid. The position, that is, the hysteresis is small, and the difference in hydraulic value is small. Therefore, the hydraulic pressure can be linearly controlled with high accuracy by adjusting the current value.

[Problems with conventional technology]
However, in order to suppress the eccentricity to 20% or more and 60% or less, when the magnetic gap between the inner peripheral side of the accommodating part and the outer peripheral side of the plunger is 100 μm, the inner peripheral side of the accommodating part and the outer peripheral side of the plunger It is necessary to suppress the sum of the thicknesses of the respective nonmagnetic layers to 40 μm or more and 80 μm or less. To process the nonmagnetic layer by resin coating or NiP plating, the processing thickness is excessive and the processing time is long. There was a concern that the productivity would decrease as the length increased, and the amount of expensive material used increased, resulting in an increase in cost.

  In addition, when the plunger receives a suction force and moves to one side, or when the suction force is canceled and moves to the other side by the biasing force, the space formed on both end faces in the movement direction of the plunger exhibits the effect of the damper, For this reason, it is necessary to have a breathing hole that communicates both end faces of the plunger, and there is a concern that it will be expensive to machine a through groove or a through hole in the outer peripheral surface or inside of the plunger. .

Also, in order to reduce the side force on the outer peripheral surface of the plunger, it is necessary to undercut the outer peripheral surface in order to reduce a wide sliding area, especially in order to improve the slidability in hydraulic oil in a low temperature environment Therefore, there is a concern that the processing of the annular groove will be difficult as the processing accuracy and assembly accuracy management become strict and the cost will be increased.
JP 2002-222710 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a small and high performance solenoid valve by adopting an electromagnetic drive device having a simple structure without increasing the cost.

[Means of Claim 1]
In the electromagnetic drive device adopting the means of claim 1, there are provided a plunger, an accommodating portion that accommodates the plunger in a reciprocating manner, and a suction portion that acts between the plunger and a magnetic force that attracts the plunger on one side in the reciprocating direction. A core stator that forms a magnetic circuit with the plunger, and a solenoid that generates a magnetic force that attracts the plunger to the suction portion when energized. The plunger is disposed coaxially with the suction portion, and is disposed on the outer circumferential surface. It is characterized in that at least one sliding ring made of a nonmagnetic material and formed into an annular shape is attached.

  This makes it easy to dispose the suction portion on the other side of the core stator so as to face one side of the plunger that is accommodated in the accommodation portion so as to be able to reciprocate, thereby attracting by the magnetic force between the plunger and the core stator. The force can be increased and the value can be made substantially constant regardless of the displacement amount of the plunger, and a stable suction force is ensured.

  In addition, when the plunger reciprocates in the housing part, the sliding is not performed on the entire circumference but on the outer circumference of the sliding ring, so that sliding resistance can be reduced, and the occurrence of hysteresis is easily reduced. Can do. Thereby, the linear control performance by increase / decrease in an electric current value improves.

[Means of claim 2]
In the electromagnetic driving device employing the means of claim 2, the sliding ring is made of an elastic thin plate material such as a non-magnetic metal or resin.

  According to this, by utilizing the elasticity of the member, the sliding ring is fitted to the plunger while being expanded in the radial direction, and when the expansion is stopped, the sliding ring is restored by elasticity, and a binding force can be generated and fixed to the plunger. Assembling is easy, it can be firmly fixed, and can be prevented from falling off from external vibrations.

[Means of claim 3]
In the electromagnetic drive device employing the means of claim 3, the annular shape after the sliding ring is fitted and attached forms a partial annular shape in which a portion of the annular shape is cut. It is a feature. Thus, similarly to the second aspect, the expansion is facilitated and the fitting to the plunger is facilitated, and the passage of the hydraulic fluid communicating in the axial direction is formed on the outer peripheral surface of the plunger. An axial through hole that has been processed in the center is not necessary, and the cost can be suppressed.

[Means of claim 4]
In the electromagnetic driving apparatus employing the means of claim 4, the outer diameter of the sliding ring after being fitted and attached is slightly larger than the outer diameter of the plunger. Thereby, the predetermined magnetic gap of the radial direction between a plunger and a core stator can be set easily.

[Means of claim 5]
In the electromagnetic driving device adopting the means of claim 5, the sliding ring is provided with a groove having a diameter smaller than the outer diameter of the plunger in the circumferential direction of the outer peripheral surface of the plunger, and is fitted and fitted in the groove. It is a feature. As a result, the fixed position of the sliding ring is reliably determined, and the slippage in the reciprocating direction can be prevented.

[Means of claim 6]
In an electromagnetic valve employing the means of claim 6, a sleeve having a plurality of fluid flow paths penetrating through a cylindrical peripheral wall, an electromagnetic drive device according to any one of claims 1 to 5, A spool that reciprocally moves in the sleeve in conjunction with the plunger and controls the flow rate or pressure of the hydraulic oil by opening and closing the fluid flow path; and a biasing means that biases the spool to the other side in the reciprocating direction; It is characterized by having.

  According to this, the axial displacement of the plunger accommodated coaxially to the suction portion of the core stator so as to be reciprocally movable can be directly transmitted to the spool. The plunger of this electromagnetic drive device is easy to set the magnetic gap in the axial direction and the radial direction to a predetermined value, and at the same time reduces the occurrence of eccentricity and side force, thus reducing the occurrence of hysteresis and stabilizing Thus, it is possible to realize a small and high-performance solenoid valve that generates a large suction force and can perform accurate, rapid, and stable linear control. In addition, the simple structure simplifies the assembly, improves productivity, and suppresses high costs.

The best embodiment of the present invention has a plunger, an accommodating portion that accommodates the plunger in a reciprocating manner, and a suction portion that acts between the plunger and a magnetic force that attracts the plunger on one side in the reciprocating direction. And a core stator that forms a magnetic circuit, and a solenoid that generates a magnetic force that attracts the plunger to the attracting portion when energized. The plunger is disposed coaxially with the attracting portion, and is made of a non-magnetic material on the outer peripheral surface. In the sleeve having a plurality of flow paths penetrating the cylindrical peripheral wall in conjunction with the plunger, employing an electromagnetic drive device having at least one sliding ring formed in an annular shape. A spool that controls the flow rate or pressure of the hydraulic oil by opening and closing the flow path, and an urging means that urges the spool to the other side in the reciprocating direction. Those were example.
The best mode of the present invention will be described together with Example 1 shown in the drawings.

[Configuration of Example 1]
FIG. 1A is an axial sectional view of an electromagnetic valve in the present embodiment, FIG. 1B is a partially enlarged detail view in an XX section of an electromagnetic driving device, and FIG. 1C is a main part of the electromagnetic driving device. It is an enlarged detail drawing of (sliding ring part).
The solenoid valve 1 is a spool-type hydraulic control valve that opens and closes a flow path (port) 7 and adjusts the flow rate and pressure of hydraulic oil by driving the spool 3 with the magnetic force from the solenoid 2. The electromagnetic valve 1 is used for controlling hydraulic pressure in a hydraulic control device for an automatic transmission for automobiles, for example.

  As shown in FIG. 1A, the electromagnetic valve 1 is disposed on the other side of the valve body portion 4 in which the spool 3 for changing the opening / closing or opening ratio of the port 7 is accommodated, and the magnetic force from the solenoid 2. And an electromagnetic driving device 5 for driving the spool 3 in the axial direction. In the electromagnetic valve 1 having the rod-like shape of the present embodiment, the axial valve body 4 side is referred to as one side and the electromagnetic driving device 5 side is referred to as the other side. Shall be followed.

  The valve body 4 accommodates a spool 3 having a different diameter step structure which is displaced in the axial direction in conjunction with a plunger 6 which will be described later, and the spool 3 is slidable in the axial direction, and also has a hydraulic oil inlet or outlet. And a spring 8 for urging the spool 3 to the other side.

The electromagnetic driving device 5 includes a yoke 16 as a stator, a core stator 15 and a solenoid 2 formed by winding a coil around a cylindrical bobbin and molded with resin, a plunger 6 as a mover, and displacement of the plunger 6 as a valve body. 4 and a shaft 13 for transmission to the motor.
The yoke 16, the core stator 15 and the plunger 6 constitute a magnetic circuit that flows (circulates) the magnetic flux excited in the solenoid 2 by energization, and is made of a magnetic material.

  The yoke 16 is a cylindrical hollow cylinder having an opening on one side and a bottom on the other side. The opening cylinder portion on the one side surrounds a core stator 15 which will be described later and is caulked and joined to the sleeve 8 by caulking. A crimped portion 16a is provided. Further, a through-hole is provided in the center of the bottomed cylindrical portion on the other side, and is fitted to the cylindrical portion 10 of the core stator 15 to serve also as a core ring 16b as a magnetic circuit. The other end is provided with a caulking portion 16a that is opened in the same manner as the one end and has been stealed for caulking and joining the end plates 18.

  The core stator 15 is a cylindrical member that includes a cylindrical portion 10 penetrating in the axial direction and has a flange portion 17 for assembly on one side thereof, and the plunger 6 can be reciprocally moved on the other side of the cylindrical portion 10. A housing portion 14 having a smooth inner periphery and a bearing portion 21 for housing the shaft 13 in a reciprocating manner are integrally formed on one side thereof.

  The bearing portion 21 and the accommodating portion 14 have the same axial center, and accommodate the shaft 13 having a diameter smaller than the outer diameter of the plunger 6 so as to be reciprocally movable, so that the other end face of the bearing portion 21 is perpendicular to the axial direction. Is formed so as to form a predetermined magnetic gap opposite to the plunger 6. Further, an annular stopper 23 made of a nonmagnetic material is provided between the plunger 6 facing the suction part 22 to prevent the plunger 6 from being sucked and directly contacting the suction part 22. The stopper 23 is provided to prevent the plunger 6 from being sucked and brought into direct contact with the suction portion 22, so that the stopper 23 may be fixed to the plunger 6 side. A covering portion made of a non-magnetic material may be provided on the opposite end face of each of the two.

  In addition, a thin portion 19 as a magnetoresistive portion that reduces leakage of magnetic flux between the suction portion 22 and the housing portion 14 is formed on the outer periphery of the housing portion 14 where the suction portion 22 is formed. . As a result, the magnetic flux of the solenoid 2 flows between the suction portion 22 and the plunger 6, sucking the plunger 6 to one side in the reciprocating direction, and generating a large suction force that is substantially constant regardless of the displacement amount of the plunger 6. it can. In order to reduce the sliding resistance with the plunger 6, nickel phosphorus (NiP) plating may be applied as a coating on the inner peripheral side of the housing portion 14.

  Further, the bearing portion 21 supports the shaft 13 so as to be slidable in the axial direction, and a finite gap is formed on the sliding surface between the bearing portion 21 and the shaft 13, so that the air or operation associated with the displacement of the plunger 6 is performed. Oil communication is secured. In addition, an undercut may be provided on the outer peripheral surface of the shaft 13, thereby reducing sliding resistance and ensuring more communication, and the displacement of the plunger 6 can be accurately transmitted to the spool 3. In the present embodiment, an example in which the shaft 13 is configured separately from the plunger 6 is shown, but the shaft 13 may be configured integrally with the plunger 6 or the spool 3.

  The plunger 6 is a columnar member that is disposed in the accommodating portion 14 of the core stator 15 so as to be able to reciprocate with a predetermined gap. One end face in the axial direction of the plunger 6 is perpendicular to the axial direction. The suction portion 22 formed on the other side end surface of the bearing portion 21 is opposed and formed with a uniform gap. Thereby, a large suction force that is substantially constant regardless of the displacement amount of the plunger 6 is generated. In addition, two sliding rings 11 are provided on the outer peripheral surface of the plunger 6.

  As shown in FIG. 1B, the sliding ring 11 is a member made of a thin plate of a non-magnetic material such as stainless steel (SUS) or resin, rounded into a cylinder and formed into an annular shape. The sliding ring 11 has a smooth outer peripheral surface formed in an annular shape, and has an appropriate opening interval with the rounded ends open without being fixed in consideration of assembly. It has a C-shaped cross-sectional shape that is easy to expand and contract in the radial direction, that is, a partial annular shape in which a part formed in an annular shape is cut.

  Further, as shown in FIG. 1C, two groove portions 12 having a predetermined depth are provided at equal intervals in the circumferential direction of the outer peripheral surface of the plunger 6, and the sliding ring 11 is elastically provided in the groove portion 12. It is inserted. At this time, the thickness of the sliding ring 11 and the groove depth of the groove portion 12 of the plunger 6 are set so that the outer diameter of the incorporated sliding ring 11 is larger than the outer diameter of the plunger 6 and the same as the inner diameter of the accommodating portion 14. Is decided. Furthermore, since the width of the groove 12 processed on the outer peripheral surface of the plunger 6 is slightly larger than the width of the sliding ring 11, even if the elastic binding force is weak, the groove processing is somewhat eccentric. Even if it occurs, the sliding ring 11 becomes familiar with the accommodating portion 14 when inserted into the accommodating portion 14 so that smooth sliding is possible.

  Thereby, the plunger 6 can slide smoothly and with a slight sliding resistance on the outer peripheral surfaces of the two sliding rings 11 without sliding on the entire outer periphery thereof. Further, as shown in FIGS. 1B and 1C, a uniform magnetic gap is formed between the accommodating portion 14 of the core stator 15 and the plunger 6, and the sliding ring 11 having a C-shaped cross section is formed. The inverted C-shaped open space portion 24 formed in the open portion communicates with the magnetic gap and also communicates with the spaces formed on both end surfaces of the plunger 6 in the moving direction.

  Further, one end surface in the axial direction of the plunger 6 is perpendicular to the axial direction, and forms a uniform gap (referred to as a magnetic gap) facing the attraction surface 22 formed on the other end surface of the bearing portion 21 of the core stator 15. Then, it abuts against the other side of the shaft 13 and transmits the driving force to the spool 3 in the axial direction. The sliding ring 11 of the plunger 6 is configured to form a uniform magnetic gap as described above to prevent the plunger 6 from being eccentric. However, the gap between the sliding ring 11 and the accommodating portion 14 (referred to as an air gap). ) Is high, the degree of freedom in setting the thickness of the sliding ring 11 is high, so that the eccentricity condition of the plunger 6 (suppressed to 20% or more and 60% or less) can be satisfied (established).

  The solenoid 2 and the core stator 15 are surrounded and accommodated by the yoke 16. The caulking portion 16a on one side of the yoke 16 is caulked and joined together with the flange portion 17 of the core stator 15 and the flange portion 8a of the sleeve 8 so that the flange portions 17 and 8a are brought into close contact with each other to maintain liquid tightness. The body part 4 and the electromagnetic drive device 5 are connected. Further, the caulking portion 16a on the other side of the yoke 16 is caulked and joined to an end plate 18 having a labyrinth-like breathing path, thereby being damaged for some reason from the outside. Even in this case, the internal plunger 6 and the like are protected from being affected.

[Operation of Example 1]
When the solenoid 2 is energized, a magnetic flux is generated by exciting the coil. The generated magnetic flux circulates through the magnetic paths of the core stator 15, the plunger 6 and the yoke 16. However, the magnetic resistance is large in the suction portion 22 of the bearing portion 21 and the thin portion 19 of the housing portion 14, and the magnetic flux flows into the plunger 6 from the suction portion 22. At this time, a magnetic attractive force is generated in the gap between the attracting portion 22 and one end face of the plunger 6. This magnetic attractive force acts on one side of the plunger 6, and the plunger 6 moves against the urging force of the spring 9, which is an urging means, and the spool 3 is interlocked with the plunger 6 via the shaft 13. Move to one side.

  By the movement of the spool 3, the spool 3 blocks or communicates with each port 7 of the sleeve 8, or changes the open / close ratio to control the inflow and outflow amount of hydraulic oil, that is, the flow rate or pressure.

  When the energization is turned off, the magnetic flux disappears, the magnetic attractive force acting on the plunger 6 disappears, and the spool 3 and the plunger 6 are initialized by the biasing force of the spring 9 which is the biasing means of the valve body 4. It is pushed back to the position and stops.

  From the above, the displacement of the plunger 6 is substantially determined mainly by the balance between the attractive force and the biasing force. Since the attractive force is proportional to the increase in the current value, the desired flow rate or pressure can be set easily by linear control of the applied current of the solenoid 2. At this time, the plunger 6 can move smoothly and accurately without being eccentric by the sliding ring 11. As a result, it is possible to set the flow rate or pressure with high accuracy and stability.

[Effect of Example 1]
In the present embodiment, the electromagnetic driving device 5 of the present invention may arrange the suction portion 22 on the other side of the core stator 15 so as to face one side of the plunger 6 that is accommodated in the accommodating portion 14 so as to be reciprocally movable. It becomes easy, the attraction force due to the magnetic force between the plunger 6 and the core stator 15 can be increased, and can be set to a substantially constant value regardless of the displacement amount of the plunger 6, thereby ensuring a stable attraction force. Further, when the plunger 6 reciprocates in the housing portion 14, the sliding is not performed on the entire circumference but on the outer circumference of the sliding ring 11, so that the sliding resistance can be reduced, and hysteresis is easily generated. Can be reduced.

  The sliding ring 11 is characterized in that the annular shape after being fitted and attached forms a partial annular shape in which a part of the annular ring is cut, and is formed by rounding an elastic thin plate material. ing. Thereby, it becomes easy to expand, and the assembly to the plunger 6 is facilitated, and it can be firmly fixed by elasticity, and can be prevented from falling off due to vibrations from the outside. In addition, since the partial annular shape forms a passage of hydraulic oil communicating with the outer peripheral surface of the plunger 6 in the axial direction between the accommodating portion 14 and the plunger 6, the center portion of the plunger 6 has been conventionally processed. An axial through-hole is not required, and cost can be suppressed.

  The sliding ring 11 is characterized in that the outer diameter after being fitted and attached is slightly larger than the outer diameter of the plunger 6. Thereby, the radial magnetic gap between the plunger 6 and the core stator 15 can be easily set. The sliding ring 11 is characterized in that a groove portion 12 having a diameter smaller than the outer diameter of the plunger 6 is provided on the outer peripheral surface of the plunger 6 and is fitted and attached in the groove portion 12. Thereby, the fixed position of the sliding ring 11 is decided reliably, and the slipping off in the reciprocating direction can be prevented.

  In addition, the solenoid valve 1 that employs the electromagnetic drive device 5 in the present embodiment generates a stable and large attractive force, and at the same time, reduces the occurrence of eccentricity and side force. A small, high-performance solenoid valve that can be controlled can be realized. In addition, the simple structure simplifies the assembly, improves productivity, and suppresses high costs.

[Configuration of Example 2]
A second embodiment of the present invention is shown in FIG. FIG. 2A is an axial sectional view of the solenoid valve in the second embodiment, and FIG. 2B is a partially enlarged detail view in the YY section of the electromagnetic drive device.
Components that are substantially the same as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the first embodiment, two sliding rings 11 that are fixed to the plunger 6 of the electromagnetic driving device 5 with an elastic force are provided at equal intervals. However, the present invention is not limited to this, and this embodiment is characterized in that one sliding ring 11 is fixed to the approximate center in the axial direction of the outer peripheral surface of the plunger 6 with an elastic force.

  The difference from the first embodiment is the difference in whether two sliding rings 11 are attached or one. When one is used, a sliding ring 11 having a larger ring width than that of two is adopted. There is no difference except to do, and there is no change in other configurations.

[Effect of Example 2]
The electromagnetic drive device 5 in the present embodiment is mainly the difference in the number of inserted slide rings 11, the other configurations are not changed, and the same operations and effects as in the first embodiment can be obtained. In particular, when a large amount of hydraulic oil moves and passes through the inverted C-shaped open space 24 cut into a partial annular shape, one is easier to communicate with and the sliding ring 11 is also assembled. It becomes easy. Accordingly, the structure is simplified and the cost can be suppressed.

(A) is an axial sectional view of the solenoid valve, (b) is a partially enlarged detail view in the XX section of the electromagnetic drive device, and (c) is an enlarged detail view of the main part of the electromagnetic drive device. (Example 1). (A) is an axial sectional view of a solenoid valve, and (b) is a partially enlarged detail view in a YY section of an electromagnetic drive device (Example 2).

Explanation of symbols

1 Solenoid valve 2 Solenoid 3 Spool (valve)
4 Valve body part 5 Electromagnetic drive device 6 Plunger (mover)
7 port (flow path)
8 Sleeve 8a, 17 Flange part 9 Spring (biasing means)
10 Tube 11 Slide ring 12 Groove (groove)
13 Shaft 14 Housing 15 Core stator (fixed core)
16 Yoke 16a Caulking portion 16b Core ring 18 End plate 19 Thin portion 21 Bearing portion 22 Suction portion 23 Stopper 24 Open space portion

Claims (6)

A mover,
An accommodating portion that accommodates the mover in a reciprocating manner; and a suction portion that acts between the mover and a magnetic force that attracts the mover on one side in a reciprocating direction. A fixed core to be formed;
A solenoid that generates a magnetic force that attracts the mover to the suction portion by energization;
The electromagnetic drive device, wherein the mover is disposed so as to be coaxially opposed to the suction portion, and at least one sliding ring formed of a nonmagnetic material in an annular shape is attached to an outer peripheral surface.   The electromagnetic drive device according to claim 1, wherein the sliding ring is formed of an elastic thin plate material such as a nonmagnetic metal or resin.   3. The sliding ring according to claim 1, wherein the annular shape after being fitted and attached forms a partial annular shape in which a part of the annular ring is cut. Electromagnetic drive device.   4. The electromagnetic wave according to claim 1, wherein an outer diameter of the sliding ring after being fitted and attached is slightly larger than an outer diameter of the mover. 5. Drive device.   The sliding ring is provided with a groove having a diameter smaller than the outer diameter of the mover in the circumferential direction of the outer peripheral surface of the mover, and is fitted and attached in the groove. The electromagnetic drive device as described in any one of Claim 4. A sleeve having a plurality of fluid flow paths penetrating a cylindrical peripheral wall;
An electromagnetic drive device according to any one of claims 1 to 5,
In conjunction with the mover, reciprocatingly moves in the sleeve, and opens and closes the fluid flow path to control the flow rate or pressure of the fluid; and
Biasing means for biasing the valve body to the other side in the reciprocating direction;
A solenoid valve comprising:

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