JP6561379B2 - Solenoid valve and brake system - Google Patents

Description

  The present invention relates to a solenoid valve and a brake system.

For example, a brake device (brake system) mounted on a railway vehicle or the like includes a compressor that generates high-pressure air, a tank that stores the generated high-pressure air, and a brake device body that is driven by the high-pressure air supplied from the tank And. Further, the compressor, the tank, and the brake device main body are communicated with each other by a plurality of pipes, and a valve device for changing the communication state is provided on the pipes.
As a specific example of such a valve device, an electromagnetic valve described in Patent Document 1 below is known. In the solenoid valve described in Patent Document 1, a normally open port, a normally closed port, and a common port connected to different pipes are formed. The opening and closing of these ports changes depending on the position of the movable iron core that moves forward and backward according to the energization state of the coil. That is, this valve device operates as a three-way valve.

JP-A-8-291874

  Here, in recent years, a demand for reducing the size and size of the valve device as described above is particularly increasing. However, in the electromagnetic valve described in Patent Document 1, the normal open port, the normal close port, and the common port extend in different directions. For this reason, when attaching a valve apparatus to another apparatus, it is necessary to lay piping connected to each port in three different directions. Therefore, the physique and mounting area of the valve device including the piping are increased.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a sufficiently miniaturized electromagnetic valve.

The electromagnetic valve according to the first aspect of the present invention is provided with a coil that generates a magnetic field in the axial direction when energized, and a rod shape that extends in the axial direction, and is provided at one end in the axial direction. The first valve seat, a communication passage communicating the first valve seat and the outer peripheral surface, the fixed iron core excited by the coil, and provided at the end of the one side of the fixed iron core While forming a cylindrical shape extending in the axial direction and forming an inner flow path extending in the axial direction between the inner cylindrical portion provided on the inner peripheral side of the coil and the inner peripheral surface of the inner cylindrical portion, A first valve body that is provided so as to be relatively movable in the axial direction with respect to a peripheral surface, is provided at an end portion on the other side in the axial direction, and contacts and separates from the first valve seat; and one in the axial direction And a second valve body provided at the end on the side, which is movable by being excited by the coil No core and the outer peripheral side of the inner tubular portion as a fixed core extending in the axial direction one side and the inner circumferential side cylindrical provided on the coil, over the axial direction between the inner tubular portion An outer cylindrical portion that extends and communicates with the communication passage, and forms an outer flow path, a valve chamber that communicates with the inner flow path, and a second valve seat that is provided in the valve chamber and contacts and separates from the second valve body A second port communicating the second valve seat and the outer surface, a second port communicating the valve chamber and the outer surface, and the outer flow path and the outer surface not communicated with the valve chamber. A valve main body having a third port that communicates , the outer peripheral surface is a surface on the outer peripheral side of the fixed iron core, and the outer surface is a surface facing the outside of the valve main body .
An electromagnetic valve according to an aspect of the present invention is a coil that generates a magnetic field in the axial direction when energized, and has a rod shape that extends in the axial direction, and is provided at an end on one side in the axial direction. One valve seat, a communication passage that communicates the first valve seat and the outer peripheral surface, a fixed iron core that is excited by the coil, and the axial direction provided at the one end of the fixed iron core An inner flow passage extending in the axial direction is formed between the inner cylindrical portion extending in a cylindrical shape and the inner peripheral surface of the inner cylindrical portion so as to be movable relative to the inner peripheral surface in the axial direction. A first valve body provided at an end portion on the other side in the axial direction and contacting and separating from the first valve seat; and a second valve body provided at an end portion on the one side in the axial direction. A movable iron core excited by the coil, and from the fixed iron core to the one side in the axial direction An outer cylindrical portion that forms an outer channel that extends in the axial direction between the inner cylindrical portion and communicates with the communication passage, and the inner cylindrical portion. A valve chamber communicating with the flow path, a second valve seat provided in the valve chamber and contacting and separating the second valve body, a first port communicating the second valve seat and the outer surface, the valve chamber and the A second port communicating with the outer surface, and a valve body having a third port not communicating with the valve chamber and communicating with the outer flow path and the outer surface, and the outer peripheral surface is fixed It is a surface on the outer peripheral side of the iron core, the outer surface is a surface facing the outside in the valve body, and when viewed from the axial direction, the outer peripheral surface of the movable iron core and the inner peripheral surface of the inner cylindrical portion An area having a relatively large separation distance and a small area are formed. Portion including the separation distance is larger region side is formed by the magnetic permeability is greater material than portion including the separation distance is small region side.

According to this configuration, the outer flow path communicating with the third port is formed in the axial direction by the inner cylindrical portion and the outer cylindrical portion. In addition, an inner flow path is formed in the axial direction between the inner cylindrical portion and the movable iron core. Further, the outer channel and the inner channel are communicated with each other through a communication path.
As a result, in a state where the second port and the third port are in communication, for example, the fluid that has flowed into the inner flow path from the second port flows into the inner flow path from one side in the axial direction toward the other side. After flowing through, the air flows into the outer flow path from the other side in the axial direction through the communication path. The fluid that has flowed into the outer flow path flows through the outer flow path from the other side in the axial direction toward the one side, and is then discharged to the outside from the third port.
Thus, the fluid that has flowed to the other side in the axial direction through the inner flow path can be returned to the position on the one side in the axial direction again by the communication path and the outer flow path. Therefore, the third port can be arranged in the vicinity of the second port. That is, the size and size of the apparatus can be reduced as compared with the configuration in which the second port and the third port are greatly separated from each other.

  According to the second aspect of the present invention, in the electromagnetic valve according to the first aspect, the first port, the second port, and the third port are on the same surface of the outer surface of the valve body. May be open.

According to this configuration, since the first port, the second port, and the third port are opened on the same surface in the outer surface of the valve body, the connection is made when connecting these ports to other devices. The area required for this can be reduced.
Here, when joining the surface where the above ports are arranged and the surface of another device, it is common to polish the connecting surfaces of each other in order to prevent fluid leakage. According to the above configuration, since the first port, the second port, and the third port are opened on the same surface of the outer surface of the valve body, the surface to be polished is one surface. It can be limited to. That is, the manufacturing cost and the maintenance cost can be reduced as compared with the case where these ports are opened on a plurality of different surfaces.

  According to the third aspect of the present invention, the electromagnetic valve according to the first or second aspect is configured to urge the movable iron core toward the one side in the axial direction, thereby An elastic member that contacts the second valve seat may be provided.

  According to this configuration, when the coil is not energized, the movable iron core is urged to one side in the axial direction by the elastic member. As a result, the first valve body is separated from the first valve seat, and the second valve body abuts the second valve seat with sufficient force. That is, the fluid leakage between the second valve body and the second valve seat can be further suppressed.

  According to a fourth aspect of the present invention, in the electromagnetic valve according to any one of the first to third aspects, the inner flow path includes an outer peripheral surface of the movable iron core and an inner periphery of the inner cylindrical portion. It may be a groove formed on any one of the surfaces and extending over the axial direction.

  According to this configuration, it is possible to easily form the inner flow path only by forming a groove on one of the outer peripheral surface of the movable iron core and the inner peripheral surface of the inner cylindrical portion.

  According to a fifth aspect of the present invention, in the solenoid valve according to the fourth aspect, the circumferential direction of the axis is provided on one of the outer peripheral surface of the movable iron core and the inner peripheral surface of the inner cylindrical portion. A plurality of the grooves provided at intervals may be formed.

  According to this configuration, since the plurality of grooves are formed at intervals in the circumferential direction, the flow area of the inner flow path can be sufficiently ensured.

  According to a sixth aspect of the present invention, in the solenoid valve according to any one of the first to fifth aspects, the outer peripheral surface of the movable iron core and the inner periphery of the inner cylindrical portion when viewed from the axial direction. A region having a relatively large separation distance from the surface and a small region are formed, and the portion including the region side where the separation distance is large in the movable iron core is more than the portion including the region side where the separation distance is small. You may form with the material with a large magnetic permeability.

According to this configuration, since the region where the separation distance between the outer peripheral surface of the movable iron core and the inner peripheral surface of the inner cylinder portion is relatively large and the small region are formed, the region where the separation distance is particularly large. Then, it is possible to secure a sufficient flow area as the inner flow path.
Here, in the region where the separation distance is large, there is a concern that the magnetic flux density of the magnetic field formed by the coil is lowered. However, according to the configuration as described above, the portion including the region having the large separation distance in the movable iron core is formed of a material having a relatively large magnetic permeability, so that the magnetic flux density can be lowered in the region. Can be reduced. That is, the movable iron core can be moved more smoothly according to the energization state of the coil.

  According to the seventh aspect of the present invention, the brake system includes a compressor that compresses a fluid supplied from the outside to generate a high-pressure fluid, a tank that stores the high-pressure fluid supplied from the compressor, A brake device that brakes the vehicle with the high-pressure fluid; a brake control device that adjusts the pressure of the high-pressure fluid supplied from the tank and supplies the high-pressure fluid to the brake device; An electromagnetic valve according to any one aspect, and the electromagnetic valve is incorporated in at least one of the compressor, the tank, and the brake device.

  According to this configuration, the size and size of the brake device can be reduced by reducing the size of the solenoid valve.

  According to the present invention, it is possible to provide a sufficiently miniaturized solenoid valve and a brake device including the same.

It is a figure showing composition of a brake system concerning a first embodiment of the present invention. It is sectional drawing of the solenoid valve which concerns on 1st embodiment of this invention. It is a component diagram which shows the structure of the fixed iron core which concerns on 1st embodiment of this invention, an inner cylinder part, and an outer cylinder part. It is sectional drawing which looked at the movable iron core which concerns on 1st embodiment of this invention from the direction which cross | intersects an axis. It is the figure which looked at the movable iron core concerning a first embodiment of the present invention from the direction of an axis. In the solenoid valve which concerns on 1st embodiment of this invention, it is a figure which shows the state in which the coil is supplied with electricity. It is the figure which looked at the movable iron core, inner side cylinder part, and outer side cylinder part which concern on 2nd embodiment of this invention from the axial direction. It is a principal part enlarged view which shows the modification of the sheet | seat part which concerns on each embodiment of this invention, and a convex part.

[First embodiment]
A first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the brake system 100 includes a compressor 1, a tank 2, a brake device 3, and a brake control device 4. The compressor 1 compresses a fluid (air) supplied from the outside to generate a high-pressure fluid (high-pressure air). The tank 2 stores high-pressure air supplied from the compressor 1. The brake device 3 applies a braking force to a traveling carriage provided in a railway vehicle or the like using the high-pressure air. The brake device 3 is, for example, a disc brake having a pressure increasing cylinder, a road surface brake, or the like, and is provided for each traveling carriage. Note that the brake device 3 is not necessarily provided for each traveling carriage, and may be provided for each vehicle, for example, or may be provided for each wheel of the traveling carriage.

  The brake control device 4 adjusts the pressure of the high-pressure air supplied from the tank 2 and then supplies the high-pressure air to the brake device 3. The brake control device 4 according to the present embodiment includes a command generator 41, a pressure generator 42, a variable load valve 43, a switching valve 44 (electromagnetic valve 90), and a relay valve 45.

  The command generation unit 41 generates a brake command as an electric signal based on an operation of a driver driving the vehicle, a command from the ATC, or the like. The pressure generator 42 outputs a pressure corresponding to the brake command from the command generator 41 using the high-pressure air from the tank 2. The variable load valve 43 outputs a pressure corresponding to the weight of the vehicle using the high-pressure air from the tank 2. The switching valve 44 selects and outputs one of the pressures output from the pressure generator 42 or the variable load valve 43. In other words, this switching valve operates as a three-way valve having three ports. The relay valve 45 amplifies the air capacity of the pressure output from the switching valve 44 using the high-pressure air from the tank 2 and introduces it to the brake device 3.

  In the brake system 100 configured as described above, an electromagnetic valve 90 described below is employed as the switching valve 44. The electromagnetic valve 90 includes a coil 10, a fixed iron core 11, an inner cylinder portion 12, an outer cylinder portion 13, a movable iron core 14, a valve body 15, and a spring 16 (elastic member). .

  As shown in FIG. 2, the coil 10 includes a cylindrical bobbin 17 extending in the direction of the axis A, and a copper wire 18 wound around the axis A on the outer peripheral side of the bobbin 17. The outer peripheral surface of the bobbin 17 has a uniform diameter from one side of the axis A toward the other side. A fixed iron core 11 and a movable iron core 14 to be described later are inserted through the inner peripheral surface side of the bobbin 17.

  A copper wire 18 is wound around the outer peripheral surface of the bobbin 17 without a gap. Both ends of the copper wire 18 are electrically connected to a DC power source (not shown). When energized by a DC power supply, the coil 10 generates a magnetic field in the direction of the axis A. Various modes have been proposed in the past for winding the copper wire 18 forming the coil 10, but in the present embodiment, as long as the magnetic field can be generated in the direction of the axis A as described above, any mode is possible. A winding method may be adopted.

  The coil 10 configured as described above is covered with a casing 19 from the outer peripheral side. Inside the casing 19, a quartz iron 20 for collecting magnetic lines generated from the coil 10 is embedded. The silicon iron 20 in the present embodiment has a cylindrical shape centered on the axis A, and both sides in the direction of the axis A are bent toward the axis A, respectively. By providing such silica iron 20, the magnetic field lines generated from the coil 10 are less likely to diverge outside the coil 10.

  As shown in FIG. 2 or 3, the fixed iron core 11 and the movable iron core 14 are inserted through an opening formed on the inner peripheral side of the bobbin 17. Specifically, the fixed iron core 11 and the movable iron core 14 are rod-shaped members extending in the direction of the axis A. A portion of the fixed iron core 11 on the other side in the direction of the axis A is a large-diameter portion 21 having an outer diameter that is approximately equal to or slightly smaller than the inner diameter of the bobbin 17. On the other hand, a portion on one side in the axis A direction of the fixed iron core 11 is a small-diameter portion 22 having a smaller outer diameter than the portion on the other side. A step is formed between the large diameter portion 21 and the small diameter portion 22.

  A communication path 23 is formed inside the small diameter portion 22 as a flow path through which fluid (high pressure air) flows. The communication passage 23 includes a first series passage 24 that extends coaxially with the axis A from one end of the small diameter portion 22 in the direction of the axis A toward the other side, and the other side of the first series passage 24 in the direction of the axis A. And a pair of second communication passages 25 that are connected to the ends of the two and extend radially outward.

  A first valve seat 26 is provided at one end of the first series passage 24 on the one side in the axis A direction. The first valve seat 26 contacts and separates from a first valve body 28 provided on the movable iron core 14 described later. The pair of second communication passages 25 are opened on the outer peripheral surface of the fixed iron core 11 (small diameter portion 22). That is, the first valve seat 26 and the outer peripheral surface of the fixed iron core 11 are communicated with each other through the communication passage 23.

  The fixed iron core 11 and the movable iron core 14 are covered from the outside in the radial direction with respect to the axis A direction by the coil 10 via the bobbin 17 described above. That is, when the coil 10 is energized, the fixed iron core 11 and the movable iron core 14 are excited by a magnetic field extending in the direction of the axis A (takes a magnetic force).

  A cylindrical inner cylindrical portion 12 extending in the axis A direction is attached to one end of the fixed iron core 11 in the axis A direction (the end of the small diameter portion 22 on the one side in the axis A direction). The inner cylinder portion 12 extends from the other side in the axis A direction toward the one side so as to surround the small diameter portion 22 from the outer peripheral side. The outer diameter and inner diameter of the inner cylinder portion 12 are uniform over the direction of the axis A.

  More specifically, as shown in FIG. 3, the inner cylindrical portion 12 is positioned on one side in the axis A direction with respect to the communication path 23 via a welded portion W formed by argon arc welding or the like on the fixed iron core 11. Is fixed. In other words, in this embodiment, only a part (only a part including the end part on the other side in the axis A direction) of the region where the fixed iron core 11 and the inner cylindrical part 12 overlap is welded. The welded portion W is formed in a circumferential shape along the outer peripheral surface of the small diameter portion 22. In addition, in the area | region where the inner side cylinder part 12 is attached among the small diameter parts 22, compared with the other area | region in the small diameter part 22, the external dimension is set slightly small. Thereby, positioning in the axis line A direction of the inner side cylinder part 12 can be performed easily.

  The outer cylinder part 13 is a cylindrical member provided on the outer peripheral part of the inner cylinder part 12. More specifically, the outer cylindrical portion 13 is attached to a portion on the other side in the axis A direction with respect to the small diameter portion 22 in the fixed iron core 11. The outer cylinder portion 13 has a cylindrical shape extending in the axis A direction. Similarly to the inner cylinder portion 12, the outer cylinder portion 13 is fixed to an end portion on one side in the axis A direction of the fixed iron core 11 via a welded portion W. More specifically, the welded portion W is formed in only a part (only the portion including the end portion on the other side in the axis A direction) of the region where the fixed iron core 11 and the outer cylindrical portion 13 overlap.

  The inner diameter dimension of the outer cylinder part 13 is set larger than the outer diameter dimension of the inner cylinder part 12. The outer cylinder portion 13 covers the radially outer end of the communication passage 23 (second communication passage 25) formed on the outer peripheral surface of the small-diameter portion 22 from the radially outer side. Furthermore, the outer peripheral surface of the inner cylinder part 12 and the inner peripheral surface of the outer cylinder part 13 are opposed to each other with a gap in the radial direction of the axis A.

  An interval formed between the outer peripheral surface of the inner cylindrical portion 12 and the inner peripheral surface of the outer cylindrical portion 13 is an outer flow path 33 through which a fluid flows. The outer flow path 33 communicates with the above-described communication path 23 (the first series path 24 and the second communication path 25) at the other end on the other side in the axis A direction.

  Furthermore, a plurality of hole portions 131 that penetrate the outer cylinder portion 13 in the radial direction with respect to the axis A are formed in the outer cylinder portion 13 on one side in the axis A direction at intervals in the circumferential direction. Yes. By these holes 131, the outer peripheral side of the outer cylindrical portion 13 and the outer flow path 33 and the communication path 23 are communicated with each other.

  The movable iron core 14 is provided so as to be relatively movable in the direction of the axis A with respect to the inner peripheral surface of the inner cylindrical portion 12. More specifically, as shown in FIGS. 1 and 4, the movable iron core 14 includes a rod-like movable iron core body 141 and first ends provided at both ends in the axis A direction of the movable iron core body 141. A valve body 28 and a second valve body 29 are provided. The movable iron core body 141 has a rod shape extending in the axis A direction. A first accommodating portion 30 that accommodates the first valve element 28 is formed at the other end of the movable iron core body 141 in the axis A direction. The 1st accommodating part 30 is the space formed so that it might dent toward the one side of an axis A direction from the end surface of the axis A direction other side of the movable iron core main body 141. As shown in FIG. Similarly, a second accommodating portion 31 that accommodates the second valve element 29 is formed at one end of the movable iron core body 141 in the direction of the axis A. The second accommodating portion 31 is a space formed so as to be recessed from the end surface on one side in the axis A direction of the movable iron core body 141 toward the other side in the axis A direction.

  Furthermore, as shown in FIGS. 4 and 5, a plurality of grooves S that are recessed from the radially outer side to the inner side are formed on the outer peripheral surface of the movable iron core body 141. The plurality of grooves S extend along the axis A direction. In the present embodiment, three grooves S are formed at equal intervals in the circumferential direction of the movable iron core body 141.

  The first valve body 28 and the second valve body 29 have the same configuration. As shown in FIG. 1, the first valve body 28 includes a first valve body main body 281 formed of an elastic material such as rubber and silicon, and the first valve body main body 281 from the one side in the axis A direction to the other. And a buffer spring 282 that biases toward the side.

  The surface on the other side in the axis A direction of the first valve body 281 is a seat portion 283 that is recessed toward one side in the axis A direction. The seat portion 283 comes into contact with and separates from the first valve seat 26 formed in the communication passage 23 (first series passage 24) described above.

  Similarly, the second valve body 29 includes a second valve body main body 291 having the same configuration as the first valve body main body 281 and a buffer spring 292. The second valve body 291 is biased from the other side in the axis A direction toward the one side by the buffer spring 292. The surface of the second valve body 291 on one side in the axis A direction is a seat portion 293 that is recessed toward the other side in the axis A direction. The seat portion 293 contacts and separates from a second valve seat 27 described later.

  The first valve seat 26 and the second valve seat 27 are formed with a convex portion R1 and a convex portion R2 that can be fitted to the seat portion 283 and the seat portion 293, respectively. These convex part R1 and convex part R2 are exhibiting the shape corresponding to the sheet | seat part 283 dented in the axis line A direction. Specifically, the convex portion R1 has a substantially circular cross section when viewed from the direction of the axis A, and protrudes to one side in the direction of the axis A when viewed from the direction intersecting with the axis A. Similarly, the convex portion R2 has a substantially circular cross section when viewed from the direction of the axis A, and protrudes to the other side in the direction of the axis A when viewed from the direction intersecting the axis A. Accordingly, the sheet portion 283 comes into contact with the convex portion R1 without any gap from one side in the axis A direction. Further, the sheet portion 293 abuts against the convex portion R2 from the other side in the axis A direction without a gap.

  In a state where the coil 10 is not energized (non-energized state), the movable iron core 14 configured as described above is directed toward one side in the axis A direction by a spring 16 provided in a valve body 15 described later. It is energized. As a result, the first valve body 28 is separated from the first valve seat 26. At this time, the second valve body 29 contacts the second valve seat 27.

  On the other hand, when the coil 10 is energized (energized state), the fixed iron core 11 and the movable iron core 14 are excited by the magnetic field generated by the coil, so that the movable iron core 14 is moved to the spring 16. It slides from one side to the other side in the direction of the axis A against the elastic restoring force. As a result, the first valve body 28 comes into contact with the first valve seat 26. At this time, the second valve body 29 is separated from the second valve seat 27.

  The valve body 15 is attached to one side of the casing 19 in the direction of the axis A. A bottom surface portion is formed on one side of the valve body 15 in the axis A direction, and an end edge on the other side in the axis A direction opens toward the other side in the axis A direction. In other words, the valve body 15 has a bottomed cylindrical shape extending in the direction of the axis A. A space as a valve chamber V <b> 1 is formed in an area inside the valve body 15.

  In the valve chamber V1, a portion including the end portion on one side in the axis A direction of the movable iron core 14 described above is accommodated. In the valve chamber V1, a spring 16 (elastic member) that urges the movable iron core 14 toward one side in the axis A direction is provided. More specifically, the end of one side of the spring 16 in the direction of the axis A is in contact with the flange 50 of the movable iron core 14, and the end of the other side is one of the ends in the direction of the axis A in the partition wall 60 (described later). Abutting from the side. Note that the space on the other side in the axis A direction from the valve chamber V1 is an accommodation space V2 in which a partition wall 60 and a connection portion 80 described later are accommodated.

  A second valve seat 27 is provided in the valve chamber V1 (that is, the wall surface of the valve body 15). More specifically, the second valve seat 27 is formed on the surface on the other side in the axis A direction of the bottom surface portion of the valve chamber V1. The second valve seat 27 communicates with an opening (first opening H1) formed on the outer surface of the valve body 15 via the first port P1. That is, the first port P1 is a flow path that communicates the first opening H1 and the second valve seat 27.

  Further, another opening (second opening H2) is formed on the outer surface of the valve main body 15 at a portion different from the first opening H1. The second opening H2 communicates with the inside of the valve chamber V1 through a second port P2 as a flow path. More specifically, in the present embodiment, the second opening H2 is provided at a position on the other side in the axis A direction with respect to the first opening H1.

  Another opening (third opening H3) is further formed at the position on the other side in the axis A direction from the second opening H2 (that is, the wall surface forming the accommodation space V2). Although described later in detail, the third opening H3 communicates with the outer flow path 33 described above via a third port P3 as a flow path.

  The extending directions of the first port P1, the second port P2, and the third port P3 are the same as each other when viewed from the axis A direction. Further, the first opening H1, the second opening H2, and the third opening H3 are arranged along the axis A in general. Further, the first opening H1, the second opening H2, and the third opening H3 are formed on the same surface of the outer surface of the valve body 15.

  A partition wall 60 that partitions the valve chamber V1 and the accommodation space V2 is provided between the second port P2 and the third port P3 formed as described above. The partition wall 60 has a generally annular shape. The inner cylindrical portion 12 described above is inserted through the inner peripheral side of the partition wall portion 60. The inner peripheral surface of the partition wall portion 60 and the outer peripheral surface of the inner cylinder portion 12 are fixed to each other by a welded portion W extending in the circumferential direction. As an example, this weld W is preferably formed by argon arc welding or the like.

  A circumferential groove for accommodating the O-ring 70 is formed on the outer peripheral surface of the partition wall 60. That is, airtightness is maintained by the O-ring 70 between the inner peripheral surface of the valve body 15 and the outer peripheral surface of the partition wall 60. Therefore, the third port P3 and the inside of the valve chamber V1 are not communicated with each other (not communicated).

  Further, a connecting portion 80 is attached to the other side of the partition wall portion 60 in the axis A direction. The connecting portion 80 is an annular member interposed between the casing 19 and the valve body 15. The outer cylindrical portion 13 described above is inserted through the inner peripheral side of the connecting portion 80. An O-ring 70 is provided between the inner peripheral surface of the connecting portion 80 and the outer peripheral surface of the outer cylindrical portion 13. Further, the outer peripheral surface of the connecting portion 80 is in contact with the inner peripheral surface of the valve body 15 via the O-ring 70. Thereby, airtightness is maintained between the accommodation space V <b> 2 in the valve body 15 and the outer surface (outside) of the valve body 15.

  Further, in the present embodiment, a protruding portion 81 that protrudes from the connecting portion 80 toward the one side in the axis A direction is integrally provided on one side of the connecting portion 80 in the axis A direction. The protrusion 81 has a cylindrical shape with the axis A as the center. The protruding portion 81 is formed with a plurality of holes 82 that are arranged at intervals in the circumferential direction of the axis A and penetrate the protruding portion 81 in the radial direction. That is, the third port P3 and the outer flow path 33 are in communication with each other via the accommodation space V2, the hole 82, and the hole 131. Further, the end edge on one side of the protruding portion 81 in the axis A direction is in contact with the partition wall portion 60 without a gap.

  Subsequently, operations of the electromagnetic valve 90 and the brake system 100 according to the present embodiment will be described. The electromagnetic valve 90 can switch the open state of the first port P1, the second port P2, and the third port P3 by bringing the coil 10 into an energized state or a non-energized state.

  FIG. 1 is a diagram showing the electromagnetic valve 90 when the coil 10 is in a non-energized state. As shown in the figure, in a state where the coil 10 is not energized, the movable iron core 14 is urged to one side in the axis A direction by a spring 16. Thereby, the first valve body 28 provided on the movable iron core 14 is separated from the first valve seat 26 and the second valve body 29 is in contact with the second valve seat 27. At this time, the first opening H1 and the second valve seat 27 are in a closed state. That is, no fluid flows through the first port P1.

  The second port P2 and the inside of the valve chamber V1 communicate with each other regardless of whether the coil 10 is energized. As described above, the movable iron core 14 (movable iron core body 141) is formed with a plurality of grooves S (inner flow paths 32) extending in the direction of the axis A. The plurality of inner flow paths 32 communicate with the valve chamber V1. Therefore, the second port P <b> 2 and the other side in the axis A direction of the movable iron core 14 (around the first valve body 28) communicate with each other via the inner flow path 32.

  Here, when the coil 10 is in a non-energized state, the first valve body 28 and the first valve seat 26 are separated from each other as described above. That is, the inner flow path 32 and the communication path 23 are in communication with each other. Thereby, for example, the fluid flowing into the inner flow path 32 from the second port P2 flows into the communication path 23 (first series path 24). The fluid that has circulated from the one side toward the other side in the axis A direction along the first series passage 24 flows into the second communication passage 25. The fluid that has flowed into the second communication passage 25 flows from the radially inner side to the outer side with respect to the axis A, and flows into the outer channel 33 from the other side of the axis A.

  The fluid that has flowed into the outer flow path 33 circulates along the outer flow path 33 from the other side in the axis A direction toward the one side. The fluid that has reached the end on the one side in the axis A direction of the outer flow path 33 flows into the accommodation space V <b> 2 through the hole 131 formed in the outer cylindrical portion 13. Further, the fluid flows radially outward through the hole 82 formed in the connection portion 80 and is discharged to the outside from the third port P3.

  Thus, when the coil 10 is in a non-energized state, the second port P2 and the third port P3 are in communication with each other. That is, when a high-pressure fluid is introduced from the second port P2, the high-pressure fluid is discharged to the outside from the third port P3 through the above path. On the other hand, when a high-pressure fluid is introduced from the third port P3, the high-pressure fluid is discharged to the outside from the second port P2 through a path in the opposite order.

  Next, the case where the coil 10 is in an energized state will be described with reference to FIG. As shown in the figure, when the coil 10 is energized, the fixed iron core 11 and the movable iron core 14 are excited by the magnetic field generated by the coil 10. Due to the excited fixed iron core 11 and the movable iron core 14, the movable iron core 14 slides from one side to the other side in the direction of the axis A. That is, the movable iron core 14 is attracted to the other side in the direction of the axis A by the magnetic force between the excited fixed iron core 11 and the movable iron core 14.

  Thus, the first valve body 28 provided on the movable iron core 14 contacts the first valve seat 26 and the second valve body 29 is separated from the second valve seat 27. At this time, the first opening H1 and the second valve seat 27 are in communication with each other. That is, the outside of the electromagnetic valve 90 and the inside of the valve chamber V1 are communicated with each other via the first port P1. On the other hand, since the first valve body 28 and the first valve seat 26 are in contact with each other, the inner flow path 32 and the communication path 23 are partitioned from each other. That is, the second port P2 and the third port P3 are in a disconnected state (not connected).

  Thus, when the coil 10 is in an energized state, the first port P1 and the second port P2 are communicated with each other. That is, when a high-pressure fluid is introduced from the first port P1, the high-pressure fluid is discharged to the outside from the second port P2 via the valve chamber V1. On the contrary, when a high-pressure fluid is introduced from the second port P2, the high-pressure fluid is discharged from the first port P1 to the outside through the valve chamber V1.

  The brake system 100 according to the present embodiment includes the electromagnetic valve 90 (switching valve 44) configured as described above. As a result, either one of the high pressure air supplied from the pressure generating unit 42 or the variable load valve 43 is selectively guided toward the relay valve 45.

  As described above, according to the electromagnetic valve 90 according to this embodiment, when the movable iron core 14 is excited by the magnetic field generated from the coil 10, the movable iron core 14 is on the other side in the axis A direction. Move to. As a result, the first valve body 28 contacts the first valve seat 26 and the second valve body 29 is separated from the second valve seat 27. At this time, the first port P1 and the second port P2 are communicated.

  On the other hand, in a state where the movable iron core 14 is demagnetized (a state where it is not excited), the movable iron core 14 moves to one side in the direction of the axis A. Accordingly, the first valve body 28 is separated from the first valve seat 26, and the second valve body 29 is in contact with the second valve seat 27. At this time, the second port P2 and the third port P3 are communicated. Thus, the communication state of the first port P1, the second port P2, and the third port P3 can be switched according to the presence or absence of excitation with respect to the movable iron core 14.

  Furthermore, in the above configuration, the outer cylinder 33 and the outer cylinder 13 form an outer channel 33 that communicates with the third port P3 in the direction of the axis A. In addition, an inner flow path 32 is formed in the axis A direction between the inner cylindrical portion 12 and the movable iron core 14. Further, the outer flow path 33 and the inner flow path 32 are communicated with each other by the communication path 23.

  Thus, in a state where the second port P2 and the third port P3 are in communication, for example, the fluid that has flowed into the inner flow path 32 from the second port P2 is directed from one side to the other side in the axis A direction. After flowing through the inner flow path 32, it flows into the outer flow path 33 from the other side in the axis A direction through the communication path 23. The fluid that has flowed into the outer flow path 33 flows through the outer flow path 33 from the other side in the axis A direction toward the one side, and is then discharged to the outside from the third port P3.

  Thus, the fluid that has flowed to the other side in the axis A direction through the inner channel 32 can be returned again to the position on the one side in the axis A direction by the communication path 23 and the outer channel 33. Therefore, the third port P3 can be arranged in the vicinity of the second port P2. That is, the size and size of the apparatus can be reduced as compared with the configuration in which the second port P2 and the third port P3 are largely separated from each other.

  Furthermore, according to the above-described configuration, since the first port P1, the second port P2, and the third port P3 are opened on the same surface of the outer surface of the valve body 15, these ports are connected to other devices. In connection with each, the area required for connection can be reduced.

  Here, when joining the surface where the above ports are arranged and the surface of another device, it is common to polish the connecting surfaces of each other in order to prevent fluid leakage. According to the above configuration, since the first port P1, the second port P2, and the third port P3 are open on the same surface of the outer surface of the valve body 15, the surface to be polished. Can be limited to one plane. That is, the manufacturing cost and the maintenance cost can be reduced as compared with the case where these ports are opened on a plurality of different surfaces.

  In addition, according to the above-described configuration, in a state where the fixed iron core 11 and the movable iron core 14 are demagnetized, the movable iron core 14 is urged to one side in the direction of the axis A by the elastic member. As a result, the first valve body 28 is separated from the first valve seat 26, and the second valve body 29 abuts against the second valve seat 27 with sufficient force. That is, the fluid leakage between the second valve body 29 and the second valve seat 27 can be further suppressed.

  Furthermore, according to the above-described configuration, the inner flow path 32 is easily formed only by forming the groove S on one of the outer peripheral surface of the movable iron core 14 and the inner peripheral surface of the inner cylindrical portion 12. can do. In addition, since the plurality of grooves S are formed at intervals in the circumferential direction, a sufficient channel area of the inner channel 32 can be ensured.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 7 is a cross-sectional view of only the outer cylindrical portion 213, the inner cylindrical portion 212, and the movable iron core 214 (movable iron core body 215) in the electromagnetic valve 91 according to the second embodiment as viewed from the direction of the axis A. . As shown in the figure, the movable iron core body 215 has an asymmetric cross-sectional shape with respect to the reference axis As as viewed from the direction of the axis A. In other words, the curvatures of the arcs forming the cross section are different from each other in the region on one side of the reference axis As and the region on the other side. Thereby, between the outer peripheral surface of the movable iron core 214 and the inner peripheral surface of the inner side cylinder part 212, the area | region S1 and the small area | region S2 with which both separation distance is relatively large are formed.

  More specifically, in the cross section of the movable iron core 214, the edge having a relatively large curvature is opposed to the inner peripheral surface of the inner cylinder portion 212 with a relatively small gap. On the other hand, the edge having a relatively small curvature is opposed to the inner peripheral surface of the inner cylindrical portion 212 with a relatively large gap. Among these gaps, a relatively large gap forms an inner flow path 232 similar to the inner flow path 32 in the first embodiment described above.

  Further, in the movable iron core 214, the portion 215A on one side of the reference axis (that is, the portion including the region S1 side where the separation distance from the inner cylindrical portion 212 is relatively large) is more than the portion 215B on the other side of the reference shaft. Is also made of a material having a high magnetic permeability. As an example of such a material, when the portion 215B on the other side of the reference shaft is formed of martensitic stainless steel, the portion 215A on one side of the reference shaft may be formed of ferritic stainless steel. desirable.

  According to such a configuration, a region S1 and a region S2 having a relatively large separation distance between the outer peripheral surface of the movable iron core 214 and the inner peripheral surface of the inner cylindrical portion 212 are formed. In the region S <b> 1 where the separation distance is large, the flow channel area as the inner flow channel 232 can be sufficiently secured.

  Here, in the region S1 where the separation distance is large, there is a concern that the magnetic flux density of the magnetic field formed by the coil 10 is reduced. However, according to the configuration as described above, the portion including the region S1 having a large separation distance in the movable iron core 214 is formed of a material having a relatively large magnetic permeability, so that the magnetic flux density decreases in the region. The possibility can be reduced. That is, the movable iron core 214 can be moved more smoothly according to the energization state of the coil 10.

  The embodiments of the present invention have been described above. The above-described embodiments are merely examples, and various modifications can be made to the above-described configuration without departing from the gist of the present invention.

  For example, in the first embodiment, the example in which the groove S as the inner flow path 32 is formed on the outer peripheral surface of the movable iron core body 141 has been described. However, the aspect of the inner flow path 32 is not limited to the above. It is also possible to form the groove S as the inner flow path 32 on the inner peripheral surface of the inner cylindrical portion 12 without providing the groove S in the movable iron core body 141.

  Furthermore, in said 1st embodiment, convex part R1 and convex part R2 are each formed in square groove shape by sectional view, and sheet part 283 and sheet part 293 are these convex part R1 and convex part R2. An example of forming in a corresponding shape has been described. However, the shape of the convex portion R1 and the convex portion R2 is not limited depending on the first embodiment. As another example, as shown in FIG. 8, the convex portion R <b> 1 may have a shape that gradually decreases in diameter from the other side in the axis A direction toward the one side. Similarly, the convex portion R2 may have a shape that gradually decreases in diameter from one side to the other side in the axis A direction. Further, the sheet portion 283 and the sheet portion 293 have shapes corresponding to the convex portions R1 and R2.

  According to such a configuration, it is possible to minimize the separation distance between the sheet portion 283 and the convex portion R1, and between the sheet portion 293 and the convex portion R2. In addition, even if there is a slight shift in the radial direction of the axis A between the sheet portion 283 and the convex portion R1 and between the sheet portion 293 and the convex portion R2, the above According to the configuration, as the sheet portion 283 and the convex portion R1 and the sheet portion 293 and the convex portion R2 approach each other, it is possible to correct the deviation between them. Thereby, fluid leakage and the like can be more sufficiently suppressed.

  In addition, in the second embodiment, the configuration in which the movable iron core 214 has an asymmetric shape across the reference axis As has been described. However, the aspect of the movable iron core 214 is not limited to the above. It is also possible to make the movable iron core 214 symmetrical with respect to the reference axis As. Specifically, the movable iron core 214 may have an elliptical cross section when viewed in cross section. In such a case, it is desirable to form a part including both end edges in the minor axis direction of the ellipse with a material having a larger magnetic permeability than a part including both end edges in the major axis direction.

  Even with such a configuration, as in the second embodiment, a sufficient cross-sectional area of the inner flow path 232 can be secured, and a decrease in magnetic flux density due to the formation of the inner flow path 232 is suppressed. can do.

DESCRIPTION OF SYMBOLS 1 ... Compressor 2 ... Tank 3 ... Brake device 4 ... Brake control device 10 ... Coil 11 ... Fixed iron core 12 ... Inner cylinder part 13 ... Outer cylinder part 14 ... Movable iron core 15 ... Valve body 16 ... Spring 17 ... Bobbin 18 ... Copper wire 19 ... Casing 20 ... Silica 21 ... Large diameter part 22 ... Small diameter part 23 ... Communication path 24 ... First series passage 25 ... Second communication path 26 ... First valve seat 27 ... Second valve seat 28 ... First One valve element 29 ... second valve element 30 ... first accommodating part 31 ... second accommodating part 32 ... inner flow path 33 ... outer flow path 41 ... command generating part 42 ... pressure generating part 43 ... variable load valve 44 ... switching valve 45 ... Relay valve 50 ... Gutter 60 ... Bulkhead 70 ... O-ring 80 ... Connection 81 ... Projection 82 ... Hole 90 ... Solenoid valve 91 ... Solenoid valve 100 ... Brake system 131 ... Hole 141 ... Movable iron core body 212 ... Inner cylinder part 213 ... Outer cylinder part 214 ... Movable iron core 215 ... Movable iron core book 232 ... inner flow path 281 ... first valve body main body 282 ... buffer spring 283 ... seat part 291 ... second valve body main body 292 ... buffer spring 293 ... seat part 215A ... part 215B on one side of the reference axis ... the other of the reference axis Side portion A ... axis As ... reference axis H1 ... first opening H2 ... second opening H3 ... third opening P1 ... first port P2 ... second port P3 ... third port R1 ... convex portion R2 ... convex Part S ... Groove S1 ... Large area S2 ... Small area V1 ... Valve chamber V2 ... Storage space W ... Welded part

Claims (8)

A coil that generates a magnetic field in the axial direction when energized;
The shaft extends in the axial direction and has a first valve seat provided at one end in the axial direction, a communication passage communicating the first valve seat and the outer peripheral surface, and is excited by the coil. Fixed iron core,
An inner cylindrical portion provided on the inner peripheral side of the coil, and having a cylindrical shape provided at an end portion on the one side of the fixed iron core and extending in the axial direction;
An inner channel that extends in the axial direction with the inner peripheral surface of the inner cylindrical portion is formed so as to be relatively movable in the axial direction with respect to the inner peripheral surface, and an end on the other side in the axial direction And a second valve body provided at one end in the axial direction, and is excited by the coil. The core,
A cylindrical shape is provided on the outer peripheral side of the inner cylindrical part and on the inner peripheral side of the coil so as to extend from the fixed iron core to one side in the axial direction, and extends in the axial direction between the inner cylindrical part and the An outer cylindrical portion forming an outer flow path communicating with the communication path;
A valve chamber communicating with the inner flow path, a second valve seat provided in the valve chamber and contacting and separating the second valve body, a first port communicating the second valve seat and an outer surface, the valve chamber And a second port that communicates with the outer surface, and a valve body that has a third port that is not communicated with the valve chamber and communicates the outer flow path with the outer surface;
Equipped with a,
The outer peripheral surface is a surface on the outer peripheral side of the fixed iron core,
The outer surface is a surface facing the outside in the valve main body .   The solenoid valve according to claim 1, wherein the first port, the second port, and the third port are open on the same surface of the outer surface of the valve body.   3. The solenoid valve according to claim 1, further comprising an elastic member that urges the movable iron core toward one side in the axial direction to bring the second valve body into contact with the second valve seat. The inner flow path is
The solenoid valve according to any one of claims 1 to 3, wherein the solenoid valve is a groove formed on one of an outer peripheral surface of the movable iron core and an inner peripheral surface of the inner cylinder portion and extending in the axial direction.   5. The plurality of grooves provided at intervals in the circumferential direction of the axis are formed in either one of the outer peripheral surface of the movable iron core and the inner peripheral surface of the inner cylindrical portion. Solenoid valve. A region where the separation distance between the outer peripheral surface of the movable iron core and the inner peripheral surface of the inner cylindrical portion is relatively large and small when viewed from the axial direction is formed,
The part including the region side where the separation distance is large in the movable iron core is formed of a material having a larger magnetic permeability than the part including the region side where the separation distance is small. The solenoid valve described. A compressor that compresses a fluid supplied from the outside to generate a high-pressure fluid;
A tank for storing the high-pressure fluid supplied from the compressor;
A brake device for braking the vehicle with the high-pressure fluid;
A brake control device for adjusting the pressure of the high-pressure fluid supplied from the tank and supplying the high-pressure fluid to the brake device;
A solenoid valve according to any one of claims 1 to 6,
A brake system in which the solenoid valve is incorporated in at least one of the compressor, the tank, and the brake device. A coil that generates a magnetic field in the axial direction when energized;
The shaft extends in the axial direction and has a first valve seat provided at one end in the axial direction, a communication passage communicating the first valve seat and the outer peripheral surface, and is excited by the coil. Fixed iron core,
An inner cylindrical portion that is provided at an end of the one side of the fixed iron core and has a cylindrical shape extending in the axial direction;
An inner channel that extends in the axial direction with the inner peripheral surface of the inner cylindrical portion is formed so as to be relatively movable in the axial direction with respect to the inner peripheral surface, and an end on the other side in the axial direction And a second valve body provided at one end in the axial direction, and is excited by the coil. The core,
An outer flow is formed on the outer peripheral portion of the inner cylindrical portion so as to extend from the fixed iron core to the one axial side, and extends in the axial direction between the inner cylindrical portion and communicates with the communication passage. An outer cylinder forming a path;
A valve chamber communicating with the inner flow path, a second valve seat provided in the valve chamber and contacting and separating the second valve body, a first port communicating the second valve seat and an outer surface, the valve chamber And a second port that communicates with the outer surface, and a valve body that has a third port that is not communicated with the valve chamber and communicates the outer flow path with the outer surface;
With
The outer peripheral surface is a surface on the outer peripheral side of the fixed iron core,
The outer surface is a surface facing the outside in the valve body,
A region where the separation distance between the outer peripheral surface of the movable iron core and the inner peripheral surface of the inner cylindrical portion is relatively large and small when viewed from the axial direction is formed,
Portion including the separation distance is larger area side of the movable iron core, the solenoid valve that is formed of a material permeability is greater than the portion including the separation distance is small region side.

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