JP2007211857A - Electromagnetic spool valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce risk of hindering sliding of a plunger 7, when foreign matter reaches the plunger 7 via inner-outer breathing passages 39, while inexpensively maintaining work for arranging the inner-outer breathing passages 39 for making gas flow in and out between the inside and the outside of a core stator 8, in an electromagnetic spool valve 1. <P>SOLUTION: The core stator 8 is divided into a first core stator 30 for passing a magnetic flux on the other side in the axial direction of a solenoid coil 4 and a second core stator 31 for passing the magnetic flux on the inner peripheral side of the solenoid coil 4 and the first core stator 30 and slidingly storing the plunger 7. An outer peripheral part of the second core stator 31 is also partially cut to be formed as a flat surface 40, and the inner-outer breathing passages 39 are formed of the flat surface 40, the first core stator 30, a resin part 26 and a part of an inner peripheral surface of a step part 28. As a result, the inner-outer breathing passages 39 are lengthened more than the conventional length, and the foreign matter is easily captured. The work for arranging the inner-outer breathing passages 39 can also be inexpensively maintained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electromagnetic spool valve that switches a fluid flow path by displacing a spool using a magnetic attraction force generated by energization of a solenoid coil as a driving force.

[Conventional technology]
Conventionally, an electromagnetic spool valve has been employed for switching a hydraulic circuit in an automatic transmission, supplying hydraulic pressure in a variable valve timing device, and the like.

  For example, as shown in FIG. 3, a conventional electromagnetic spool valve 100 includes a spool 101 that is displaced in the axial direction, a sleeve 102 that slidably accommodates the spool 101 in the axial direction, and one of the spool 101 and the sleeve 102 in the axial direction. A solenoid coil 103 that is energized and generates a magnetic attractive force upon energization, and is disposed on the inner peripheral side of the solenoid coil 103, and is displaced to the other side in the axial direction by the magnetic attractive force. Of the solenoid coil 103, the core stator 106 which is disposed on the other axial side and the inner peripheral side of the solenoid coil 103 to pass the magnetic flux and slidably accommodates the plunger 105 in the axial direction, and the axial direction of the solenoid coil 103 And a yoke 107 that is disposed on one side and on the outer peripheral side and allows magnetic flux to pass therethrough.

  Here, one axial portion 108 of the core stator 106 is provided in a cylindrical shape, opens to one axial side, and is covered with one end portion of the yoke 107. The plunger 105 is accommodated in sliding contact with the inner peripheral side of the one axial portion 108, and the plunger one side internal space 109 and the plunger other side internal space 110 are respectively provided on the one axial side and the other axial side of the plunger 105. Is formed. Further, the other axial portion 111 of the core stator 106 serves as a bearing for the rod 104, and defines a space between the sleeve-side internal space 112 formed inside the sleeve 102 and the plunger other-side internal space 110.

  An internal breathing path 113 and an inner / outer breathing path 114 are provided in order to allow gas to smoothly flow into and out of the plunger one-side internal space 109 and the plunger other-side internal space 110 as the rod 104 and the plunger 105 move.

  The internal breathing path 113 allows gas to flow in and out of the core stator 106 and is provided so as to penetrate the plunger 105. That is, the internal respiratory path 113 allows gas to flow in and out between the plunger one-side internal space 109 formed inside the core stator 106 and the plunger other-side internal space 110 that is also formed inside the core stator 106.

  The inside / outside breathing path 114 allows gas to flow in and out of the core stator 106 and the outside of the core stator 106, and is provided so as to penetrate the other axial portion 111. That is, the inside / outside breathing path 114 allows gas to flow in and out between the plunger other side internal space 110 formed inside the core stator 106 and the sleeve side internal space 112 formed outside the core stator 106.

  The inside / outside breathing path 114 has a function of smoothly expanding / contracting the entire internal space of the core stator 106 including the plunger one-side internal space 109 and the plunger other-side internal space 110. That is, when the plunger 105 moves and the amount of entry of the rod 104 into the plunger other side internal space 110 increases or decreases, the entire internal space of the core stator 106 expands or contracts according to the increase or decrease of the amount of entry of the rod 104. Therefore, the inside / outside breathing path 114 allows gas to flow in and out between the plunger other-side inner space 110 and the sleeve-side inner space 112 according to the increase / decrease of the amount of the rod 104 entering, thereby smoothing the entire inner space of the core stator 106. Scale.

  By the way, since the inner / outer breathing path 114 is provided through the core stator 106 for passing magnetic flux, the inner / outer breathing path 114 is preferably as small as possible. However, the smaller the diameter is, the more complicated the operation for penetrating the inside / outside breathing path 114 becomes and the higher the cost.

  Therefore, a portion of the other axial portion 111 on the inner peripheral side that forms the bearing of the rod 104 is separated as a second core member, and the second core member is provided in a cylindrical shape. A technique for configuring the core stator 106 by fitting it on the inner peripheral side of a member has been considered (for example, see Patent Document 1). According to this technique, the inner and outer breathing path 114 can be formed by providing a groove or the like on the outer peripheral surface of the second core member or the inner peripheral surface of the first core member. And the operation | work which provides a groove | channel etc. in the outer peripheral surface and inner peripheral surface of a member is simpler than the operation | work which penetrates a member and provides a respiratory path, Therefore A cost also becomes low.

[Problems with conventional technology]
However, in the sleeve side internal space 112, the oil leaks from the internal flow portion 115 through which the oil flows, and this oil contains foreign matters such as iron powder. Then, the oil containing the foreign matter may reach the plunger 105 via the inside / outside breathing path 114 and hinder the sliding of the plunger 105.
JP 2005-214236 A

  The present invention has been made to solve the above-described problems, and its purpose is to maintain a work for providing an internal / external breathing path at a low cost, while fluids such as oil containing foreign substances pass through the internal / external breathing path. It is to reduce the possibility of reaching the plunger via and obstructing the sliding of the plunger.

[Means of Claim 1]
The electromagnetic spool valve according to claim 1 is a spool that is displaced in the axial direction, a solenoid coil that is disposed on one side of the spool in the axial direction and receives a current to generate a magnetic attractive force, and an inner peripheral side of the solenoid coil. A plunger that is arranged and displaced on the other side in the axial direction by a magnetic attraction force, and a solenoid that is disposed on the other side and the inner peripheral side of the solenoid coil in order to pass the magnetic flux, and the plunger is slidable in the axial direction And a core stator to be housed.

The core stator is provided in an annular shape, and is disposed on the other axial side of the solenoid coil so as to pass the magnetic flux. The core stator is disposed on the inner peripheral side of the solenoid coil and the first core stator so as to pass the magnetic flux. It consists of the 2nd core stator which accommodates a plunger slidably in one part.
Further, a part of the outer peripheral surface of the second core stator, together with a part of the inner peripheral surface of the member disposed on the outer peripheral side of the second core stator, is one side in the axial direction of the second core stator and the other side in the axial direction of the second core stator. A breathing path is formed to allow gas to flow in and out.

  Here, a plunger one-side internal space is formed on one axial side of the second core stator, and a sleeve-side internal space is formed on the other axial side of the second core stator. For this reason, the respiratory tract of the present invention can fulfill the function of the internal and external respiratory tract. When the breathing path of the present invention functions as an inside / outside breathing path, the distance required for a fluid such as oil containing a foreign substance to reach the plunger becomes longer than the conventional inside / outside breathing path. That is, the conventional internal / external breathing path communicates the sleeve side internal space and the plunger other side internal space, whereas the internal / external breathing path according to the present invention includes the sleeve side internal space and the plunger one side internal space. It is because it communicates.

  Moreover, the axial direction other side part of the respiratory path of this invention is formed with a 1st core stator and a 2nd core stator. For this reason, it is easy for iron-based foreign substances to be captured by passing the magnetic flux between the first core stator and the second core stator.

  As described above, the distance required for a fluid such as oil containing foreign matter to reach the plunger is increased, and iron-based foreign matters are easily captured at the other axial portion of the respiratory path of the present invention. Thus, it is possible to reduce the possibility that the foreign substance reaches the plunger via the inside / outside breathing path and inhibits the sliding of the plunger.

  Furthermore, since the respiratory path of the present invention is formed by a part of the outer peripheral surface of the second core stator and a part of the inner peripheral surface of the member disposed on the outer peripheral side of the second core stator, the breathing path is provided through the member. There is no need. For this reason, the operation | work which provides the respiratory path of this invention is simple and low-cost.

  Therefore, it is possible to reduce the possibility that fluids such as oil containing foreign substances reach the plunger via the internal / external breathing path and obstruct the sliding of the plunger while maintaining the work of providing the internal / external breathing path at low cost. it can.

[Means of claim 2]
According to a second aspect of the present invention, the electromagnetic spool valve includes a yoke that is disposed on one side and the outer peripheral side of the solenoid coil in the axial direction and allows the magnetic flux to pass therethrough.
Thereby, the axial direction one side part of the respiratory path of this invention is formed with a yoke and a 2nd core stator. For this reason, when the magnetic flux is transferred between the yoke and the second core stator, iron-based foreign matters are more easily captured. As a result, it is possible to further reduce the possibility that the foreign matter reaches the plunger via the inside / outside breathing path and obstructs the sliding of the plunger.

[Means of claim 3]
According to the electromagnetic spool valve of the third aspect, the breathing path is formed by the outer peripheral surface provided by cutting a part of the outer peripheral portion of the second core stator in the axial direction.
This means represents one method of forming the respiratory tract of the present invention.

[Means of claim 4]
According to the electromagnetic spool valve of the fourth aspect, the annular body made of the magnetic material is disposed on the outer peripheral side of the one axial portion of the second core stator.
This annular body reduces the axial thickness of one part of the yoke in the axial direction and enables press molding of the yoke, or fills the gap formed between the one part of the yoke in the axial direction and the core stator to increase the magnetic efficiency. (Because the other end portion of the yoke is caulked and fixed, one portion in the axial direction has a high degree of freedom and a gap is likely to occur.)
And by arrange | positioning this annular body, since the respiratory tract of this invention becomes a maze shape further, the probability that a foreign material will be captured by a respiratory tract increases.

  The electromagnetic spool valve of the best mode 1 is a spool that is displaced in the axial direction, a solenoid coil that is arranged on one side of the spool in the axial direction and generates a magnetic attractive force when energized, and an inner circumference side of the solenoid coil A plunger that displaces the spool by displacing the other side in the axial direction by a magnetic attraction force, and a solenoid coil that is disposed on the other side and the inner peripheral side of the solenoid coil so as to pass the magnetic flux, and the plunger can be slid in the axial direction. A core stator to be accommodated, and a yoke that is disposed on one axial side and the outer circumferential side of the solenoid coil to pass magnetic flux.

The core stator is provided in an annular shape, and is disposed on the other axial side of the solenoid coil so as to pass the magnetic flux. The core stator is disposed on the inner peripheral side of the solenoid coil and the first core stator so as to pass the magnetic flux. It consists of the 2nd core stator which accommodates a plunger slidably in one part.
Further, a part of the outer peripheral surface of the second core stator, together with a part of the inner peripheral surface of the member disposed on the outer peripheral side of the second core stator, is one side in the axial direction of the second core stator and the other side in the axial direction of the second core stator. A breathing path is formed to allow gas to flow in and out.

  The breathing path is formed by an outer peripheral surface provided by cutting a part of the outer peripheral portion of the second core stator in the axial direction.

  According to the electromagnetic spool valve of the best mode 2, an annular body made of a magnetic material is disposed on the outer peripheral side of one axial portion of the second core stator.

[Configuration of Example 1]
The configuration of the electromagnetic spool valve 1 according to the first embodiment will be described with reference to FIG.
As shown in FIG. 1, the electromagnetic spool valve 1 includes a spool 2 that is displaced in the axial direction and switches a fluid flow path (not shown), a sleeve 3 that slidably accommodates the spool 2 in the axial direction, and a spool 2, a solenoid coil 4 that is disposed on one side in the axial direction and generates a magnetic attractive force when energized, a yoke 5 that is disposed on one side and on the outer circumferential side of the solenoid coil 4 to pass magnetic flux, and the solenoid coil 4. The plunger 7 is disposed on the inner peripheral side, is displaced to the other axial side by the magnetic attractive force, and displaces the spool 2 via the rod 6, and is disposed on the other axial side and the inner peripheral side of the solenoid coil 4. A core stator 8 is provided which allows magnetic flux to pass and accommodates the plunger 7 slidably in the axial direction.

  The electromagnetic spool valve 1 is provided with O-rings 9 at various locations, and a space formed inside the core stator 8 (a plunger one-side internal space 13 and a plunger other-side internal space 14 to be described later) or the outside of the core stator 8. The airtightness of the space (sleeve side internal space 15 to be described later) and the liquid tightness of the internal fluidized portion 16 formed by the sleeve 3 and the spool 2 through which fluid such as oil flows are maintained.

  The spool 2 is provided with a plurality of large-diameter portions 18 to 20 that are in sliding contact with the sleeve 3 in order toward one side in the axial direction, and together with the sleeve 3 forms an internal flow portion 16 through which fluid such as oil flows. A restoring spring 21 is attached to the other axial end of the spool 2, and the spool 2 is always biased to the one axial side by the restoring spring 21. The other end of the rod 6 abuts on one end in the axial direction of the spool 2, and the biasing force by the restoring spring 21 is transmitted from the spool 2 to the plunger 7 via the rod 6, and the magnetic attraction force from the plunger 7 to the spool 2. Is transmitted.

  The sleeve 3 is provided with a plurality of openings 22 that communicate the internal fluidic portion 16 with an external fluid flow path. Then, the large-diameter portions 18 to 20 open and close the opening 22 with the displacement of the spool 2, thereby switching the fluid flow path. Further, the internal flow portion 16 is sealed off by the large-diameter portion 20 provided on the most axial side, and the internal space of the sleeve 3 (sleeve-side internal space 15) is provided on one axial side of the large-diameter portion 20. Is formed.

  The sleeve-side internal space 15 is always open to the atmosphere through a separately provided opening (not shown). In addition, fluid such as oil leaks from the internal flow portion 16 into the sleeve side internal space 15 including foreign substances.

  The solenoid coil 4 is resin-molded together with a terminal 25 for receiving power from a power source (not shown) and is built in a substantially cylindrical resin portion 26.

  The yoke 5 forms a cylindrical body that opens to the other side in the axial direction. Then, one axial portion of the yoke 5 is provided in a step shape so as to have a predetermined thickness in the axial direction and the radial direction, thereby forming a step portion 28. The resin portion 26 is disposed on the step portion 28, and the first core stator 30 and one end portion of the sleeve 3 described later are disposed on the other side of the resin portion 26. In this state, the other end portion of the yoke 5 is caulked to one end portion of the sleeve 3, whereby the electromagnetic spool valve 1 is configured integrally.

  The plunger 7 is provided in a cylindrical shape and is slidably accommodated in the core stator 8. One end of the rod 6 is in contact with the other end surface of the plunger 7. When the solenoid coil 4 is energized and a magnetic attractive force is generated, the plunger 7 is displaced to the other side in the axial direction and the spool 2 is displaced to the other side in the axial direction via the rod 6. When energization of the solenoid coil 4 is stopped and the magnetic attractive force disappears, the plunger 7 receives the biasing force of the restoring spring 21 from the spool 2 via the rod 6 and is displaced to one side in the axial direction.

  The core stator 8 is provided in an annular shape, and is disposed on the other axial side of the solenoid coil 4 to pass the magnetic flux, and is disposed on the inner peripheral side of the solenoid coil 4 and the first core stator 30 to pass the magnetic flux. The second core stator 31 slidably accommodates the plunger 7.

  The first core stator 30 is sandwiched between one end portion of the sleeve 3 and the other end portion of the resin portion 26 in the axial direction, and is sandwiched between the yoke 5 and the second core stator 31 in the radial direction. The first core stator 30 transfers magnetic flux between the yoke 5 and the second core stator 31 on the other axial side of the solenoid coil 4. Moreover, since the 1st core stator 30 is exposed to external air, a rust prevention process is performed.

  The second core stator 31 includes an axial one portion 33 that slidably accommodates the plunger 7 and an axial other portion 34 that receives the rod 6. Further, since the second core stator 31 is slidably contacted with the rod 6 and the plunger 7, a surface hardening process such as a gas soft nitriding process is performed.

  The one axial portion 33 is provided in a cylindrical shape, and one axial side is covered with one end portion 36 of the yoke 5. The plunger 7 is slidably accommodated on the inner peripheral side of the one axial portion 33, and the plunger one side internal space 13 and the plunger other side internal space 14 are respectively provided on the one axial side and the other axial side of the plunger 7. Is formed. Further, the one axial portion 33 transfers magnetic flux to and from the step portion 28 of the yoke 5.

  The other axial portion 34 serves as a bearing for the rod 6 and defines a space between the sleeve-side internal space 15 and the plunger other-side internal space 14. The other axial portion 34 transfers magnetic flux to and from the first core stator 30.

  Further, in the electromagnetic spool valve 1, in order to smoothly flow gas into and out of the plunger one side internal space 13 and the plunger other side internal space 14 with the movement of the rod 6 and the plunger 7, the internal respiratory path 38 and the internal / external respiratory path 39 are provided. Is provided.

  The internal breathing path 38 allows gas to flow in and out of the core stator 8 and is provided so as to penetrate the plunger 7. That is, the internal breathing path 38 allows gas to flow in and out between the plunger one-side internal space 13 formed inside the core stator 8 and the plunger other-side internal space 14 also formed inside the core stator 8.

  The inside / outside breathing path 39 allows gas to flow in and out of the core stator 8 and the outside of the core stator 8, and is a part of the outer peripheral surface of the second core stator 31 and a member disposed on the outer peripheral side of the second core stator 31. And a part of the inner peripheral surface. That is, as shown in FIG. 1B, a part of the outer peripheral portion of the second core stator 31 is cut in the axial direction to form a flat outer peripheral surface (referred to as a flat surface 40). The flat surface 40 forms an internal / external breathing path 39 together with a part of the internal peripheral surface of the member disposed on the outer peripheral side of the second core stator 31.

  The members arranged on the outer peripheral side of the second core stator 31 and forming the inner / outer breathing path 39 together with the second core stator 31 are the first core stator 30, the resin portion 26, and the step portion 28 of the yoke 5.

  The inside / outside breathing path 39 allows gas to flow in and out between the plunger one side internal space 13 formed inside the core stator 8 and the sleeve side internal space 15 formed outside the core stator 8.

  The inside / outside breathing path 39 functions to smoothly expand and contract the entire internal space (hereinafter referred to as the total internal space) of the core stator 8 that combines the plunger one-side internal space 13 and the plunger other-side internal space 14. That is, when the plunger 7 moves and the amount of entry of the rod 6 into the other side internal space 14 of the plunger (hereinafter referred to as the amount of entry of the rod 6) increases or decreases, the entire internal space increases or decreases in the amount of entry of the rod 6. Scale up or down accordingly. Therefore, the inside / outside breathing path 39 allows the gas to flow in and out between the plunger one-side internal space 13 and the sleeve-side internal space 15 according to the increase / decrease in the amount of the rod 6 that enters and expands / contracts the entire internal space smoothly.

[Operation of Example 1]
The operation of the electromagnetic spool valve 1 of the first embodiment will be described with reference to FIG.
When the solenoid coil 4 is energized, the plunger 7 is displaced to the other side in the axial direction, so that the volume of the plunger one side internal space 13 increases and the volume of the plunger other side internal space 14 decreases. At the same time, the rod 6 is displaced to the other side in the axial direction and the amount of the rod 6 entering is reduced, so that the volume of the entire internal space increases.

  For this reason, gas flows from the plunger other side internal space 14 to the plunger one side internal space 13 via the internal breathing path 38, and also from the sleeve side internal space 15 to the plunger one side inside via the internal / external breathing path 39. Gas flows through the space 13. As a result, the volume of the plunger one-side internal space 13 increases by the sum of the amount of inflow from the plunger other-side internal space 14 and the amount of inflow from the sleeve-side internal space 15.

  Further, when the energization of the solenoid coil 4 is stopped, the plunger 7 is displaced in one axial direction, so that the volume of the plunger other side internal space 14 increases and the volume of the plunger one side internal space 13 decreases. At the same time, the rod 6 is displaced to one side in the axial direction and the amount of the rod 6 entering increases, so that the volume of the entire internal space decreases.

  For this reason, gas flows from the plunger one side internal space 13 to the plunger other side internal space 14 via the internal breathing path 38, and from the plunger one side internal space 13 to the sleeve side inside via the internal / external breathing path 39. A gas flows into the space 15. As a result, the volume of the plunger one-side internal space 13 is reduced by the sum of the outflow amount into the plunger other-side internal space 14 and the outflow amount into the sleeve-side internal space 15.

[Effect of Example 1]
According to the electromagnetic spool valve 1 of the first embodiment, the core stator 8 is provided in an annular shape, and is disposed on the other axial side of the solenoid coil 4 to pass the magnetic flux, and the solenoid coil 4 and the first core stator 30. And a second core stator 31 that slidably accommodates the plunger 7 at one axial portion 33. A part of the outer peripheral portion of the second core stator 31 is cut in the axial direction to form a flat surface 40. The flat surface 40, together with a part of the inner peripheral surface of the first core stator 30, the resin portion 26, and the step portion 28 of the yoke 5, allows gas to flow between the plunger one side internal space 13 and the sleeve side internal space 15. An inside / outside breathing path 39 is formed for inflow and outflow.

  Thereby, the inside / outside breathing path 39 becomes longer than the case where gas flows in and out between the plunger other side internal space 14 and the sleeve side internal space 15 as in the prior art. For this reason, the distance required for a fluid such as oil containing foreign matter to reach the plunger 7 is longer than in the prior art. Further, the other axial side portion of the inner / outer breathing path 39 is formed by the inner peripheral surface of the first core stator 30 and the flat surface 40 of the second core stator 31. For this reason, when the magnetic flux is transferred between the first core stator 30 and the second core stator 31, iron-based foreign matters are easily captured.

  Thus, the distance required for a fluid such as oil containing foreign matter to reach the plunger 7 becomes longer, and iron-based foreign matter is likely to be captured at the other axial portion of the inner / outer breathing path 39. Thus, it is possible to reduce the possibility that the foreign matter reaches the plunger 7 via the inside / outside breathing path 39 and hinders the sliding of the plunger 7.

  Further, the inside / outside breathing path 39 includes a flat surface 40 that is a part of the outer peripheral surface of the second core stator 31, and a part of the inner peripheral surface of the first core stator 30, the resin portion 26, and the step portion 28 of the yoke 5. For example, the second core stator 31 does not need to be provided through the other axial portion 34 of the second core stator 31. For this reason, the operation | work which provides the inside / outside respiratory path 39 is simple and low-cost.

  Therefore, there is a possibility that fluid such as oil containing foreign matter may reach the plunger 7 via the inner / outer breathing path 39 and hinder the sliding of the plunger 7 while maintaining the work of providing the inner / outer breathing path 39 at a low cost. Can be reduced.

The electromagnetic spool valve 1 includes a yoke 5 that is disposed on one axial side and the outer circumferential side of the solenoid coil 4 to pass magnetic flux.
As a result, the axially one side portion of the inner / outer breathing path 39 is formed by the step portion 28 of the yoke 5 and the second core stator 31. For this reason, when the magnetic flux is transferred between the step portion 28 and the second core stator 31, iron-based foreign matters are more easily captured. As a result, it is possible to further reduce the possibility that a foreign substance reaches the plunger 7 via the inside / outside breathing path 39 and hinders the sliding of the plunger 7.

According to the electromagnetic spool valve 1 of the second embodiment, as shown in FIG. 2, an annular body (referred to as a ring core 44) made of a magnetic material is disposed on the outer peripheral side of the one axial portion 33. The ring core 44 is disposed to reduce the axial thickness of the step portion 28 to enable the press forming of the yoke 5 or to fill a gap generated between the step portion 28 and the one axial portion 33 to increase the magnetic efficiency. Is done.
By arranging the ring core 44, the inside / outside breathing path 39 is further formed into a labyrinth, so that the probability that foreign matter is captured in the inside / outside breathing path 39 is increased.

[Modification]
The inner / outer breathing path 39 of the present embodiment is provided by processing the outer peripheral surface of the second core stator 31, but is a member disposed on the outer peripheral side of the second core stator 31 (that is, the first core stator 30, the resin portion). 26 and the inner peripheral surface of the step portion 28) of the yoke 5 may be provided by machining.
The inner / outer breathing path 39 of the present embodiment is formed by cutting a part of the outer peripheral portion of the second core stator 31 in the axial direction and providing the flat surface 40. However, a groove is provided in a V shape or the like. May be formed.

(A) is sectional drawing which shows the structure of an electromagnetic spool valve, (b) is a rear view of a 2nd core stator (Example 1). (A) is sectional drawing which shows the structure of an electromagnetic spool valve, (b) is principal part sectional drawing which shows the principal part structure of an electromagnetic spool valve (Example 2). It is sectional drawing which shows the structure of an electromagnetic spool valve (conventional example).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic spool valve 2 Spool 4 Solenoid coil 5 Yoke 7 Plunger 8 Core stator 26 Resin part (member arrange | positioned on the outer peripheral side of a 2nd core stator)
28 steps (members arranged on the outer peripheral side of the second core stator)
30 1st core stator (member arrange | positioned on the outer peripheral side of a 2nd core stator)
31 Second core stator 33 One axial portion 39 Inside / outside breathing path (breathing path)
40 Flat surface (a part of the outer peripheral surface of the second core stator)
44 Ring core (annular)

Claims (4)

A spool that is displaced in the axial direction;
A solenoid coil that is arranged on one side of the spool in the axial direction and receives a current to generate a magnetic attractive force;
A plunger that is disposed on the inner peripheral side of the solenoid coil, and that displaces the spool by displacing to the other side in the axial direction by a magnetic attractive force;
An electromagnetic spool valve including a core stator that is disposed on the other axial side and the inner circumferential side of the solenoid coil to pass magnetic flux and slidably accommodates the plunger in the axial direction.
The core stator is
A first core stator that is provided in an annular shape and is disposed on the other axial side of the solenoid coil to pass magnetic flux;
The solenoid coil and the first core stator are arranged on the inner peripheral side and pass the magnetic flux, and the second core stator that houses the plunger in one axial portion,
A part of the outer peripheral surface of the second core stator, together with a part of the inner peripheral surface of a member disposed on the outer peripheral side of the second core stator, is one side in the axial direction of the second core stator and the axial direction of the second core stator. An electromagnetic spool valve characterized by forming a breathing path through which gas flows in and out of the other side. The electromagnetic spool valve according to claim 1, wherein
An electromagnetic spool valve comprising a yoke that is arranged on one axial side and the outer circumferential side of the solenoid coil and allows magnetic flux to pass therethrough. The electromagnetic spool valve according to claim 1 or 2,
The electromagnetic spool valve, wherein the breathing path is formed by an outer peripheral surface provided by cutting a part of the outer peripheral portion of the second core stator in the axial direction. The electromagnetic spool valve according to claim 2,
An electromagnetic spool valve, wherein an annular body made of a magnetic material is disposed on an outer peripheral side of one axial portion of the second core stator.

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