JP2005188630A - Solenoid valve gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid valve having a large degree of rotating freedom regardless of arrangement of a connector part when forming a respiratory path in a solenoid part, and preventing intrusion of foreign matter. <P>SOLUTION: The solenoid valve gear is composed such that, in the solenoid part 10 of the solenoid valve 1, an end plate 17 having the respiratory path 18 is attached to a rear part of a stepped cylindrical yoke 11. The respiratory path 18 is formed by providing an outer part opening 181 formed in an inner surface side of the end plate 17, an inner part opening 182 formed in an inner surface side, a middle passage 183, and an end passage 184. The middle passage 183 is formed like a groove in the inner surface side of the end plate 17 such that it passes a joining face of the yoke 11 and a plunger housing part 121. By this, foreign matter intruding from the outside is blocked in the middle passage 183. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a solenoid valve disposed in oil, and more specifically, includes a stator (fixed core) that forms a magnetic field by excitation of a coil, a yoke, and a mover (plunger). The present invention relates to a solenoid valve provided with a solenoid section that forms a breathing path for absorbing a volume change of a fluid generated in response to movement.

  2. Description of the Related Art Conventionally, a solenoid valve configured to include a solenoid portion that is disposed in oil and forms a breathing path is disposed at a rear portion of a yoke that constitutes the solenoid portion, as shown in, for example, JP-A-2001-263521. An introduction hole for introducing oil from the outside into the plate was formed as a breathing path.

  According to this, as shown in FIG. 9, the solenoid valve 90 includes a solenoid portion 91 and a spool valve portion 100. The solenoid portion 91 is slidably disposed in the yoke 94 so as to approach and separate from the coil 92 formed in a cylindrical shape, a fixed core 93 built in the coil 92, and the yoke 94 and the fixed core 93. The plunger 95 is provided. A shaft 96 that passes through the fixed core 93 is attached to the plunger 95, and moves along the axial direction as the plunger 95 slides.

  On the other hand, the spool valve portion 100 includes a spool 101 connected to a shaft 96 and slidable in the axial direction, and a sleeve 102 as a case body disposed so as to cover the spool 101. The spool 101 has a plurality of valve portions 103a formed with a large diameter with respect to the shaft portion along the axial direction and a valve portion 103b formed with a small diameter, and the sleeve 102 is arranged in parallel along the axial direction. A plurality of ports 104 are formed. Then, the hydraulic pressure supplied from the output port 22 to the load side can be adjusted by each valve portion 103a of the spool 101 by adjusting the opening amount of each port 104 of the sleeve 102 by appropriate movement of the spool 101 in the axial direction. It is configured.

  On the other hand, when the spool 101 is moved in the axial direction via the shaft 96 by sliding of the plunger 95, the volume is changed. Therefore, if the oil is not introduced from the outside of the solenoid valve 90 by the volume, the responsiveness deteriorates. In the solenoid unit 90, a breathing path for introducing oil from the outside is formed.

In the solenoid valve 90 shown in the above publication, the breathing path is provided with an oil introduction hole 97 a in a plate 97 that closes the solenoid portion 91 behind the yoke 94.
JP 2001-263521 A (see FIG. 1)

  However, in the solenoid valve 90 shown in the above-mentioned publication, the plate 97 is integrally coupled to the solenoid portion 91 by being caulked at the rear end portion of the case body 98 covering the yoke 94 and the coil 92 behind the yoke 94. ing. Since the oil introduction hole 97a is merely formed in the plate 97, the external oil is introduced into the oil reservoir 99 in a state including foreign matter. The foreign matter contains a large amount of chips and wear powder, and if the wear powder adheres to the sliding surface in the solenoid portion 91, the sliding surface becomes wrinkled and damages the stator and the mover. A clean operation could not be performed. Therefore, in forming a respiratory path, it has been necessary to prevent intrusion of dust and foreign matter.

  In order to solve this problem, a breathing path is formed at an attachment site with the connector portion. This is because a breathing path is provided on the inner surface of the yoke, and the passage volume is set to be greater than or equal to the filling of the breathing, and this breathing path is opened to the outside through a notch for inserting a connector. In order to prevent foreign matter from entering the magnetic circuit through the connector, it is necessary to set the connector in the ground direction, so that the degree of freedom in mounting specifications of the connector portion is limited. In other words, for example, if a layout is required so that the connector part is in the upper position according to the mounting specifications of the solenoid valve, the breathing path is placed in the upper position, and foreign matter in the oil enters the solenoid part from above. Since it becomes easy to invade, the solenoid valve is liable to malfunction and a new problem is generated.

The present invention solves the above-described problems, and provides an electromagnetic valve device that forms a breathing path so that the solenoid portion has a degree of freedom in the rotation direction while preventing intrusion of dust and foreign matter. In order to achieve the object, the invention according to claim 1
The electromagnetic valve device has a stator, a yoke, and a mover, and an end plate is mounted on the rear end portion of the yoke so as to close the solenoid portion. The end plate is provided with a breathing path having a curved path to prevent entry of foreign matter. That is, by exciting the coil, a magnetic circuit is formed between the yoke, the fixed core and the plunger, and the plunger slides in a direction approaching the fixed core. When the plunger slides, the oil stored around the plunger in the solenoid section changes in volume, and the oil around the solenoid valve device is introduced from the breathing path for a short time. It works normally.

  By forming this breathing path in the end plate, the layout of the electromagnetic valve device can be arranged regardless of the arrangement of the connector portion, so that the degree of freedom of the layout of the electromagnetic valve device can be increased. In particular, the breathing path formed in the end plate is formed by forming an intermediate passage having a curved path between an external opening formed outside the solenoid part and an internal opening formed inside the solenoid part. If foreign matter that enters from the outside is stored in the bending path, it will be difficult for the foreign matter to enter the solenoid part. Will act.

  According to the second aspect of the present invention, the intermediate passage of the breathing path formed in the end plate is bent through the mating surface between the yoke and the storage portion fitted in the yoke, and is therefore introduced into the solenoid portion. When foreign matter that enters the solenoid part together with oil moves through the passage from the external opening through the intermediate passage, the foreign matter moves in a narrow gap between the yoke and the storage part, and accumulates at that part. Will be. In addition, since both the yoke and the housing are made of a magnetic material, foreign matter containing a large amount of iron is dammed between the yoke and the housing, and is attracted to the yoke or the housing and stays at that portion. Can be prevented from entering.

  Further, in the invention described in claim 3, since the yoke and the storage portion described in claim 2 are fitted so as to form a step, foreign matter moving in the respiratory path is blocked by the step. Thus, it is difficult for the stepped portion to enter the tip portion, and it is stored on the mating surface between the yoke and the storage portion, and can be prevented from entering the solenoid portion.

  According to the fourth aspect of the present invention, when foreign matter entering through the respiratory path from the external opening reaches the side surface of the solenoid portion of the end plate, it moves along the circumferential direction of the yoke at the end surface on the yoke side of the end plate. As a result, the distance to the internal opening of the end plate becomes long, and the sediment is likely to settle and accumulate in the middle of the path, so that entry into the solenoid portion can be prevented.

  According to the fifth aspect of the present invention, when a foreign substance entering through the breathing path from the external opening reaches the side of the solenoid portion of the end plate, the passage outside the circumferential wall portion formed along the circumference. The distance from the connecting passage at one end to the inner passage is longer, and the distance to the inner opening of the end plate is longer, so that it is likely to settle and accumulate in the middle route. Intrusion into the solenoid part can be prevented.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The electromagnetic valve device described in this embodiment forms a respiratory path in an end plate arranged at the rear end of the solenoid unit. In the following description, the spool valve side (left side in FIG. 1) of the electromagnetic valve device is referred to as a front side, and the end plate side (right side in FIG. 1) is referred to as a rear side.

  FIG. 1 shows a cross section of an electromagnetic valve device (hereinafter referred to as a solenoid valve). The solenoid valve 1 according to the first embodiment comprises a solenoid portion 10 and a spool valve portion 20 as shown in FIG. The solenoid unit 10 and the spool valve unit 20 are integrally coupled by crimping and coupling one end of the solenoid unit 10 to one end of the spool valve unit 20.

  The solenoid portion 10 of the embodiment includes a magnetic material yoke 11 forming a stepped cylindrical housing, a housing portion (hereinafter referred to as a fixed core) 12 fitted into the yoke 11 and formed into a hollow shape, a yoke 11, a coil 13 that is wound around the fixed core 12, a plunger 14 that is slidably built in the fixed core 12, a connector portion 15 that is externally mounted on a part of the outer peripheral surface of the yoke 11, A non-magnetic material end play and 17 arranged behind the yoke 11 and closing the rear part of the solenoid part 10 are provided.

  The yoke 11 has a caulking portion 111 that is caulked and coupled to the spool valve portion 20 at the front portion, and a plate abutting portion 112 that abuts the front surface portion of the end plate 17 at the rear portion, and the coil 13 is fitted therein.

  The fixed core 12 forms a plunger accommodating part 121 at the rear part, and forms a flange part 122 at the front part at the end part on the spool valve part 20 side for contacting the end face on the solenoid part 10 side of the spool valve part 20. The flange portion 122 is fitted into a caulking portion 111 having an outer peripheral surface extending from the yoke 11. The caulking portion 111 extends to the outer peripheral surface of the end surface of the spool valve portion 10 and is integrally coupled to the spool valve portion 20 by caulking the outer peripheral surface of the end surface of the spool valve portion 10. Further, the plunger accommodating portion 121 of the fixed core 12 fits the plunger 14 in a slidable manner, and the rear end surface of the plunger accommodating portion 121 protrudes rearward from the plate abutting portion 112 of the yoke 11 to the end plate 17. It is fitted inside.

  The plunger 14 is slidably disposed in the plunger accommodating portion 121 of the fixed core 12 by excitation of the coil 13 and forms a fluid passage (not shown) penetrating in the axial direction. The front end surface of the plunger 14 is in contact with one end of the pin 16, and the other end of the pin 16 is in contact with the spool 30 through the fixed core 12. As a result, sliding of the plunger 14 causes the pin 16 to move in the axial direction of the solenoid valve 1 to reciprocate the spool 30 in the axial direction.

  With the above configuration, when the coil 13 is energized, a magnetic circuit flows from the coil 13 to the yoke 11, the fixed core 12, and the plunger 14, and a magnetic circuit is formed. It moves to the left, that is, the direction in which the spool 30 is pressed.

  If the coil 13 is in a non-energized state, the plunger 14 is released from the magnetic circuit, and moves in the direction away from the spool 30 on the right side in FIG. Accordingly, the spool 30 slides toward the right side in FIG.

  On the other hand, an oil sump 19 is formed between the end face of the yoke 11 and the fixed core 12 and the end plate 17 at the rear end portion (right side in FIG. 1) of the yoke 11, and the oil around the solenoid valve 1 flows. Then, the oil is introduced toward the oil sump 19 through the respiratory path 18 formed in the end plate 17.

  The breathing path 18 is formed so as to be bent so as to easily remove foreign substances that are disposed in the end plate 17 and enter from the outside. Moreover, it is desirable that the breathing path 18 be formed with a length equal to or longer than the volume change (reduced amount) of the oil filled in the fixed core 12.

  As shown in FIGS. 2 to 3, the above-described breathing path 18 has an external opening formed on the outer surface opposite to the solenoid unit 10 in the end plate 17 formed in a disc shape. 181, an inner opening 182 formed in a concave shape at the center of the inner surface on the side of the solenoid 10, and a groove formed on the inner surface of the end plate 17 and formed circumferentially facing the end surface of the yoke 11 The intermediate passage 183 is formed. The intermediate passage 183 and the internal opening 182 communicate with each other through a linear groove-like end passage 184. The end passage 184 is located below the end plate 17 so that when the end plate 17 is assembled to the solenoid unit 10, even if a foreign object passes through the fitting part with the plunger housing part 121, it does not easily enter the internal opening 182. It is desirable to assemble the end plate 17 so that the end plate 17 rises upward from the lower side of the intermediate passage 183.

  The internal opening 182 has a slight gap for allowing oil to pass between the outer periphery of the plunger housing 121 of the fixed core 12 and can be fitted to the outer periphery of the plunger housing 121. The internal opening 182 is in contact with the rear end surface of the plate contact portion 112 of the yoke 11 and is fitted on the outer peripheral surface of the plunger housing portion 121 of the fixed core 12 with a slight gap. The oil sump 19 described above is formed between 182a and the rear end surface of the plunger 14.

  When the internal opening 182 of the end plate 17 is externally fitted to the plunger housing 121 of the fixed core 12, a step is formed between the end passage 184 of the respiratory path 18 and the internal opening 182 in the intermediate path 183 of the respiratory path 18. A portion 185 is formed. The stepped portion 185 prevents foreign matter from entering the internal opening 182 by blocking the foreign matter.

  On the other hand, the spool valve portion 20 is formed in a cylindrical shape having one end opened, and a sleeve 21 in which the spool 30 is slidably incorporated in the axial direction, and a front end portion of the sleeve 21 (an end portion opposite to the solenoid portion 10). The coil spring 40 that biases the spool 30 and the stopper plug 41 that is screwed into the sleeve 21 at one end of the sleeve 21 to support the coil spring 40 are provided.

  In the sleeve 21, an output port 22, an input port 23, and a feedback port 24 are arranged in order toward the solenoid unit 10 side, and a first drain port 26 is arranged on the solenoid unit 10 side of the feedback port 24, Further, a second drain port 27 and a third drain port 28 are formed on the output port 22 on the side opposite to the solenoid portion 10 in order from the direction opposite to the solenoid portion 10 side.

  On the other hand, the spool 30 has a small-diameter first valve portion 31 disposed on the solenoid portion 10 side of the feedback port 24, and a large-diameter first valve that adjusts the respective aperture amounts facing the output port 22 and the input port 23. 2, and a large-diameter third valve portion 33 that opens and closes the third drain port 28 so as to face the third drain port 28, and the rear end surface of the first valve portion 31 Is arranged so as to contact the pin 16.

  When the third valve portion 33 moves so as to gradually open the third drain port 28 by the movement of the spool 30, the amount of oil flowing from the input port 23 to the output port 22 is reduced to reduce the third drain port 28. When the third valve portion 33 moves in the direction to close the third drain port 28, the amount of oil flowing from the input port 23 to the output port 22 is increased. Further, a projecting shaft portion 35 is formed at the front end portion of the third valve portion 33, and the above-described coil spring 40 is sheathed.

  The input port 23 allows hydraulic oil supplied from a tank (not shown) to flow in and can be discharged to the output port 22, and the output port 22 communicates with the feedback port 24 on the outside, and one of the discharged hydraulic oil. The part is introduced into the feedback chamber 29 from the feedback port 24. Since the feedback chamber 29 is formed between the large-diameter second valve portion 32 and the small-diameter first valve portion 31, the hydraulic oil introduced into the feedback chamber 29 is the large-diameter second valve portion. The large-diameter valve portion 32 side, that is, the spool 30 is pushed forward (left side in FIG. 1) due to the difference in area between the valve portion 32 and the first valve portion 31 having a small diameter.

  Therefore, the spool 30 is stationary at a position where the urging force of the coil spring 40 and the force by which the plunger 14 in the solenoid unit 10 is attracted to press the spool 30 and the force to press the spool 30 by the hydraulic pressure of the feedback chamber 29 are balanced. Will be.

  Next, the operation of the solenoid valve 1 configured as described above will be described.

  First, if the coil 13 in the solenoid unit 10 is in a non-energized state, the plunger 14 does not have a force to press the spool 30, so the spool 30 has a biasing force of the coil spring 40 and a spool of hydraulic oil in the feedback chamber 29. It stops at a position where the force pressing 30 is balanced. That is, in this state, the second valve portion 32 is moved to a position where the input port 23 and the output port 22 can communicate with each other, and the flow rate of the hydraulic oil flowing from the input port 23 to the output port 22 Since the third drain port 28 is closed by the third valve portion 33, the amount of oil flowing from the output port 22 to the line (for example, an automatic transmission in the vehicle) becomes maximum.

  On the other hand, in the feedback chamber 29, for example, foreign matter such as wear powder of a gear operated by the automatic transmission is mixed in the hydraulic oil flowing from the line side. Since the feedback chamber 29 is at a high pressure, a part of the hydraulic fluid flows to the first valve portion 31 side together with the foreign matter.

  Since there is a slight fitting gap for the first valve portion 31 to slide between the first valve portion 31 and the inner peripheral surface of the sleeve 21, hydraulic oil with foreign matter is present. Part of this flows through this fitting gap. However, since the first drain port 26 formed in the sleeve 21 is formed between the first valve portion 31 and the solenoid portion 10, the outer peripheral surface of the first valve portion 31 and the sleeve 21 are formed. The foreign matter that has passed between the inner peripheral surface is arranged in the ground so that the foreign matter is discharged from the first drain port 26 to prevent the foreign matter from entering the linear solenoid.

  When the coil 13 is energized, a magnetic flux flows through the yoke 11, the fixed core 12, and the plunger 14 to form a magnetic circuit. Accordingly, the plunger 14 moves leftward in FIG. 1 with respect to the fixed core 12 to move the spool 30 leftward against the urging force of the coil spring 40.

  The spool 30 is in a balanced position between the biasing force of the coil spring 40 and the pressing force of the hydraulic pressure in the feedback chamber 29 on the spool 30 and the pressing force of the plunger 14 on the spool 30 by the magnetic attraction force in the solenoid unit 10. Quiesce.

  In this position, the second valve portion 32 serves to reduce the amount of hydraulic oil flowing from the input port 23 and increase the amount of hydraulic oil discharged from the third drain port 28. The hydraulic pressure that flows to the load side will be reduced.

  On the other hand, the oil flowing into the feedback chamber 29 is discharged to the outside from the first drain port 26.

  At the same time, the oil stored around the outside of the yoke 11 in the solenoid unit 10 causes the volume of the plunger storage unit 121 to change due to the leftward movement of the plunger 14, causing a pressure drop, thereby Oil is introduced into the oil reservoir 19 through the breathing path 18 of the end plate 17 and replenished in the plunger housing 121.

  When foreign matter enters the solenoid unit 10 from the oil breathing path 18 due to the on / off operation of the solenoid unit 10, the foreign matter sinks downward in the refracted path of the breathing path 18, so that an oil reservoir in the yoke 11 is obtained. 19 cannot enter.

  That is, oil introduced from the outside of the solenoid unit 10 enters from the external opening 181 of the end plate 17 and passes through the intermediate path 183. At this time, since the intermediate path 183 forms a circumferential groove disposed on the inner side surface (solenoid part 10 side) of the end plate 17, the invading foreign matter is behind the plate contact part 112 of the yoke 11. From the position opposed to the end surface, it further tries to enter the internal opening 182 through the outer peripheral surface of the plunger accommodating portion 121 of the fixed core 12.

  The fitting gap between the end plate 17 and the plunger accommodating portion 121 of the fixed core 12 is formed to such a degree that it is difficult for foreign matter to pass through the oil, so that the foreign matter stays in the gap and enters beyond that. do not do. Furthermore, since the plunger accommodating portion 121 is made of a magnetic material and the foreign matter is made of iron with much wear powder, the foreign matter is attracted to the outer peripheral surface of the plunger accommodating portion 121 by the excitation of the coil 13. At this time, even if the excitation of the coil 13 is released, residual magnetism is generated in the plunger housing 121 and the foreign matter is kept in an attracted state.

  It is important that the breathing path 18 is bent from the outer opening 181 to the inner opening 182, and foreign substances are likely to precipitate due to the bending. In the first embodiment, when the oil enters from the outside through the external opening 181 to the inner surface of the end plate 17, it passes through the intermediate passage 183 that is arranged over a substantially half circumference and forms a labyrinth, and from the end passage 184 to the inside. It will be introduced into the opening 182. The path of a foreign substance that enters the breathing path 17 at the same time as the infiltration of oil is bent when traveling from the external opening 181 to the intermediate path 183, bent by the intermediate path 183 itself, and further from the intermediate path 183 to the straight groove 184. It is bent at the time of advancement, and it is bent at the time of proceeding from the fitting portion of the plunger accommodating portion 121 to the internal opening 182 so as to pass through many bent portions, and settles at each bent portion, and the fixed core It is adsorbed by the 12 plunger storage parts 121 and does not reach the internal opening 182.

  Note that the respiratory path 18 may have another form instead of the above form. For example, in the case of the respiratory path shown in FIG. 2, the intermediate passage 183 is formed in a semicircular shape, but the semicircular intermediate passage 183 may be formed in a zigzag shape.

  As shown in FIGS. 4 to 5, the breathing path 18 </ b> A has an internal opening 182 </ b> A formed in a concave shape at the center of the inner surface of the end plate 17, and an internal opening formed on the inner surface at the outer surface of the end plate 17. An outer opening 181A located below the portion 182A, and an intermediate passage 183A formed in a linear groove shape through the end plate 17 from the outer opening 181A toward the inner opening 182A. May be. In this embodiment, the bent portion is formed in a step portion 185A between the outer opening 181A and the intermediate passage 183A, and between the intermediate passage 183A and the inner opening 182A, with the plunger accommodating portion 121 of the fixed core 12. It becomes.

  Further, as shown in FIGS. 6 to 7, another respiratory path 18 </ b> B is arranged at the inner opening 182 </ b> B formed in the inner central portion of the end plate 17 and the outer opening surface of the end plate 17, and is arranged from the inner opening 182 </ b> B. An outer opening 181B formed at a lower position, a wall 186 formed on the inner surface of the end plate 17 and formed around the inner opening 182B over substantially the entire circumference, and the outer opening 181B An outer groove portion 187 formed on the outer side of the wall portion 186, an inner wall portion 188 formed on the inner side of the wall portion 186, connected to the outer peripheral surface of the inner opening 182 B, and a part of the wall portion 186. A communication passage 189 that is disposed and communicates with the outer groove portion 187 and the inner groove portion 188, and is formed at a position opposite to the axis of the end plate 17 in the inner groove portion 188, and is formed with the inner groove portion 188B and the inner opening. An end passage 190 that communicates the 182B, is formed having a.

  The groove bottom portion of the inner wall portion 188 is formed shallower than the bottom surface of the inner opening portion, and the outer wall portion 187, the inner wall portion 188, and the communication passage 189 form an intermediate passage 183B. Further, the communication passage 189 is arranged on the opposite side of the position of the external opening 181B with respect to the axis of the end plate 17, and the width of the communication passage 189 is narrow so as to prevent the passage of foreign matter through oil as much as possible. It is desirable to do.

  Therefore, in this embodiment, the oil that has entered from the external opening 181B is cut off from the internal opening 182B and the internal groove 188 when the internal opening 182B is engaged with the plunger housing 121 of the fixed core 12. From the outer side surface of the end plate 17 to the inner side surface, it enters the outer groove portion 187 and makes a half turn, then enters the inner groove portion 188B from the communication passage 189, and after making a half turn by the inner groove portion 188, from the end passage 190 The internal opening 188B is reached.

  The foreign matter entering with the oil is settled at the bottom of the outer groove portion 187 while moving the outer groove portion 187 because the intermediate passage 183B forms a labyrinth at the outer groove portion 187 and forms an adsorbing portion of the foreign matter at the inner groove portion 188. In addition, entry into the inner groove portion 188 is prevented by the communication passage 189, and some foreign matter that has entered the inner groove portion 188 is adsorbed in the plunger housing portion 121 of the fixed core 12 in the inner groove portion 188, It does not reach the internal opening 182B.

  In the solenoid valve 1 configured as described above, since the end plate 17 is formed of a non-magnetic material, even if the respiratory path 18 forms various forms, the magnetic circuit generated by excitation of the coil 13 is not generated. , The yoke 11, the fixed core 12, and the plunger 14 are formed. When the plunger 14 moves to the right, that is, even if the plunger 14 approaches the end plate 17, the plunger 14 As shown in the graph of FIG. 8, the attractive force is not greatly reduced even when the stroke of the plunger 14 is long (position close to the end plate 17). .

  As described above, in the solenoid valve 1 according to the embodiment, a magnetic circuit is formed between the yoke 11, the fixed core 12, and the plunger 14 by exciting the coil 13, whereby the plunger 14 is connected to the fixed core 12. It slides in the approaching direction. As the plunger 14 slides, the oil stored in the plunger accommodating portion 121 of the fixed core 12 changes in volume, and the oil around the solenoid valve 1 is introduced from the breathing path 18. It is replenished by doing. By forming the breathing path 18 in the end plate 17 disposed so as to abut the plate abutting portion 112 of the yoke 11 at the rear end portion of the solenoid portion 10, the arrangement of the connector portion 15 attached to the solenoid portion 10 is determined. Regardless, the breathing path 18 can be placed at any position. In particular, by disposing the end passage that communicates with the internal opening at the bottom, it is possible to prevent the foreign matter that has entered the end passage from entering the internal opening and improve the adsorption power as shown in the figure. it can.

  Further, by providing a bent path in the intermediate path 183 of the breathing path 18 or passing through a fitting portion of two members having a small gap, it is possible to prevent foreign matter from entering the internal opening 182. it can.

  Furthermore, by forming the end plate 17 from a non-magnetic material, it is possible to prevent the attractive force from being lowered even at a position where the plunger 14 has a long stroke.

It is front sectional drawing of the solenoid valve which shows the 1st form of this invention. It is a perspective view which shows the respiratory route of the end plate in FIG. It is an expanded sectional view which shows the solenoid part in FIG. It is a partial front sectional view of a solenoid valve according to a second embodiment of the present invention. It is a perspective view which shows the end plate in FIG. It is a partial front sectional view of a solenoid valve according to a third embodiment of the present invention. It is a side view which shows the end plate in FIG. It is an attraction force characteristic graph in FIG. It is sectional drawing which shows the conventional solenoid valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, Solenoid valve 10, Solenoid part 11, Yoke 12, Fixed core 13, Coil 14, Plunger 15, Connector part 16, Pin 17, End plate 18, Breathing path 181, External opening part 182, Internal opening part 183, Intermediate passage ,
184, end passage 187, outer groove (outer peripheral passage)
188, inner groove (inner peripheral passage)
189, communication passage 190, end passage 20, spool valve portion 21, sleeve 22, output port 23, input port 24, feedback port 30, spool 31, first valve portion 32, second valve portion 33, third Valve

Claims (6)

A solenoid unit is configured to include a stator and a yoke that form a magnetic circuit by excitation of a coil, and a mover that is slidably arranged by excitation of the coil, and the sliding of the mover on the solenoid unit An electromagnetic valve device that forms a breathing path for absorbing a change in volume of fluid generated with respect to
An end plate that closes the solenoid portion is disposed at the end of the yoke, and a breathing path that communicates with the outside is formed on the end plate,
The breathing path has an external opening formed on the outer surface side of the solenoid part of the end plate and an internal opening formed on the inner surface side of the solenoid part, and the external opening and the internal opening are An electromagnetic valve device that is communicated by an intermediate passage having a curved path.   The solenoid valve device according to claim 1, wherein a part of the bent path is formed on a mating surface between the yoke and a cylindrical magnetic material accommodating portion disposed on an inner peripheral surface of the yoke. .   The solenoid valve device according to claim 2, wherein the mating surfaces are formed in a step shape.   4. The electromagnetic valve device according to claim 1, wherein the intermediate passage is formed in a circumferential shape on a surface of the end plate facing the yoke contact surface.   The end plate is formed with an outer peripheral side passage and an inner peripheral side passage across the circumferential wall portion on the solenoid part side end surface, and the outer peripheral side passage and the inner peripheral side passage are connected by a communication passage, The solenoid valve device according to claim 1, 2, 3, or 4, wherein the communication passage is disposed at a position spaced apart from the external opening with respect to an axis of the end plate.   6. The electromagnetic valve device according to claim 1, wherein the end plate is made of a nonmagnetic material.

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