JP5708343B2 - Electromagnetic drive device and solenoid valve - Google Patents

Description

  The present invention relates to an electromagnetic drive device and an electromagnetic valve including the same.

  Conventionally, in a movable body that reciprocates in the axial direction, an electromagnetic drive device in which the movable core is suction-driven to the suction portion by passing the magnetic flux generated by energizing the coil through the movable core to the suction portion of the fixed core It has been known. Such an electromagnetic drive device is suitably used in, for example, an electromagnetic valve that opens and closes a port through which a fluid flows according to a reciprocating movement of a movable body having a movable core.

  Now, in the fixed core of the device disclosed in Patent Document 1 as a kind of electromagnetic drive device, a cylindrical housing portion that reciprocally moves the movable core coaxially sucks the movable core in the forward direction. It is provided with the suction part. Here, a coil is provided on the outer peripheral side of the housing portion connected to the forward suction portion, and the movable core slides and is guided in the axial direction on the inner peripheral surface of the housing portion. It has become so. With such a configuration, in the disclosed device of Patent Document 1, the magnetic flux generated by energizing the coil on the outer peripheral side of the housing portion is passed through the movable core on the inner peripheral side of the housing portion, and passed to the suction portion connected to the housing portion, This makes it possible to move the movable body stably in the axial direction.

Japanese Patent No. 4569371

  However, in the electromagnetic drive device disclosed in Patent Document 1, since the suction portion and the housing portion are formed with the same radial thickness, the magnetic flux generated by energizing the coil is directed to the housing portion rather than the suction portion. May flow and spread. Therefore, especially when the movable core and the fixed core that should be arranged coaxially are eccentric from each other, the magnetic flux is easily transferred from the movable core to the housing portion on the outer peripheral side, and from the movable core to the suction portion. The magnetic flux delivered will decrease. As a result, in the movable core that transfers the magnetic flux to the outer circumferential side accommodating portion, the side force acting in the radial direction increases, so that the drive responsiveness of the movable body having the movable core decreases. Further, since the side force is increased, the sliding friction between the movable core and the accommodating portion is increased, which impairs the durability of the electromagnetic drive device. Furthermore, since the housing portion has the same radial thickness as the suction portion that needs to increase the radial thickness in order to increase the magnetic flux passage density, the outer peripheral coil of the housing portion has the same thickness. It is difficult to increase the suction force by increasing the number of turns. Such a situation where it is difficult to increase the suction force is not desirable because it becomes a bottleneck in improving the drive response of the movable body.

  The present invention has been made in view of the problems described above, and an object thereof is to provide an electromagnetic drive device capable of improving drive response and durability and an electromagnetic valve including the same.

The invention according to claim 1 includes a movable body having a movable core and reciprocally moving in the axial direction of the movable core, a cylindrical housing portion for reciprocally moving the movable core on the same axis, and a movable core. A fixed core having a suction part that sucks in the forward direction of the axial direction, a coil that is provided on the outer peripheral side of the housing part and generates a magnetic flux by energization , a movable core, a fixed core, and a suction part that houses the coil and A magnetically connected yoke, and the magnetic flux generated by the coil is transferred to the suction portion through the movable core, so that the movable core is attracted to the suction portion. The outer peripheral surface is increased in diameter as the distance from the front portion increases, thereby forming an outer peripheral surface that increases the radial thickness of the suction portion, and the accommodating portion has a radial thickness that is narrower than the suction portion. connected to a suction portion of the direction, intake The smallest diameter portion of the outer peripheral surface is located in the forward direction from the coil, and the radial thickness of the portion of the suction portion where the outer peripheral surface is most expanded is magnetically reduced between the suction portion and the yoke. It is larger than the axial length of the connected area .

  Thus, in the invention according to claim 1, since the radial thickness of the suction portion is larger than the radial thickness of the accommodating portion that is narrower than that, the magnetic flux generated by energizing the coil is It becomes easier to flow from the movable core to the suction part than the accommodation part. Therefore, even when the movable core and the fixed core are eccentric from each other, it is difficult to transfer the magnetic flux from the movable core to the housing portion on the outer peripheral side, and is concentrated on the suction portion connected in the forward direction with the housing portion. Can be handed over. As a result, the side force that presses the movable core against the outer peripheral housing portion is reduced, so that the drive response of the movable body having the movable core can be improved. In addition, since the side force is reduced, the sliding friction between the movable core and the housing portion is reduced, so that the durability of the electromagnetic drive device can be improved.

  Furthermore, in the suction part according to the first aspect of the present invention, since the increase in the radial thickness is realized by the diameter increase of the outer peripheral surface in accordance with the separation in the forward direction from the housing part, the magnetic flux delivered from the movable core The passage area increases as the distance increases. Thereby, the density of the passing magnetic flux in the attraction unit can be increased, and the attraction force for attracting and driving the movable core can be increased. Further, the attracting force can be increased by increasing the number of turns of the coil on the outer peripheral side and increasing the density of the generated magnetic flux as much as the radial thickness of the housing portion is reduced more than the attracting portion. According to these, it becomes possible to improve the drive responsiveness of a movable body having a movable core that receives a suction force.

Further, according to the first aspect of the present invention, the minimum diameter portion of the outer peripheral surface of the suction portion is located in the forward direction from the coil. In this invention, since the outer peripheral surface of the suction part is expanded from the minimum diameter part located in the forward direction with respect to the coil as the distance from the forward direction increases, the position of the coil can be removed from the outer peripheral side of the suction part. it can. According to this, since the radial thickness of the housing portion to be connected to the minimum diameter portion of the suction portion can be reduced as much as possible, the number of turns of the outer peripheral side coil of the housing portion can be increased to increase the suction force. Can be strengthened. In addition, since the radial thickness of the suction portion that will be detached from the inner peripheral side of the coil can be increased as much as possible in accordance with the separation in the forward direction from the housing portion, it is also possible to increase the suction force. it can. From these things, it becomes possible to contribute to the improvement of the drive responsiveness about the movable body which has a movable core.

According to the second aspect of the present invention, the suction part forms a suction surface that faces the movable core in the forward direction and sucks the movable core, and the minimum diameter part of the outer peripheral surface is the coil in the axial direction. Located between the suction surface. In this invention, the suction part starts from the minimum diameter part between the suction surface facing the movable core in the forward direction and the coil in the direction opposite to the forward direction, and the radial direction thickness increases according to the separation in the forward direction. Therefore, the closer to the attraction surface, the larger the magnetic flux passage area. According to this, in combination with the above-described operation due to the minimum diameter portion being positioned in the forward direction with respect to the coil, the suction force of the movable core by the suction surface can be increased. This can greatly contribute to the improvement of the drive response of the body.

The invention according to claim 3 includes a ring core provided on the opposite side of the suction portion with the coil sandwiched in the axial direction, and the magnetic flux generated by the coil passes from the ring core to the suction portion through the housing portion and the movable core. . In the present invention, the magnetic flux generated by energizing the coil passes from the ring core on the opposite side of the suction portion across the coil in the axial direction to the housing portion and the movable core. At this time, in the accommodating portion having a radial thickness that is narrower than the suction portion, the magnetic flux that is transferred from the ring core is difficult to diffuse in the axial direction, so the movable core and the fixed core are eccentric from each other. In this case, the magnetic flux can be concentrated and transferred to the movable core. As a result, the side force that presses the movable core against the outer peripheral housing portion is reduced, which can contribute to an improvement in drive response of the movable body having the movable core. In addition, since the side force is reduced, the sliding friction between the movable core and the housing portion is reduced, which can contribute to the improvement of the durability of the electromagnetic drive device.

According to the fourth aspect of the present invention, the outer peripheral surface of the suction portion gradually increases in diameter as it moves away from the housing portion in the forward direction. In the suction portion according to the present invention, the outer peripheral surface gradually increases in diameter in accordance with the separation in the forward direction from the accommodating portion, so that the magnetic flux transferred from the movable core easily passes along the outer peripheral surface having the gradually increased diameter. According to this, the density of the passing magnetic flux in the attraction unit can be increased and the attraction force can be increased, so that it is possible to contribute to the improvement of the drive response of the movable body having the movable core.

According to the fifth aspect of the present invention, the suction part gradually expands so that the diameter expansion rate of the outer peripheral surface is constant or decreases as the suction part is separated from the storage part. In the suction portion according to the present invention, the outer peripheral surface of the gradually enlarged diameter form in which the diameter expansion rate is constant or decreases according to the separation in the forward direction from the housing portion can smooth the passage of the magnetic flux delivered from the movable core. According to this, since the density of the passing magnetic flux in the attraction unit can be increased and the attraction force can be increased, it is possible to greatly contribute to the improvement of the drive response of the movable body having the movable core.

According to the sixth aspect of the present invention, the suction portion supports the movable body so as to be reciprocally movable on the inner peripheral side of the outer peripheral surface. Here, when the movable core and the fixed core are eccentric, the side force is generated in the radial direction when the forward end portion of the movable core is sucked by the suction portion end portion on the housing portion side. It is easy to work by concentrating on the edge. However, in the movable body in which the suction part is supported so as to be reciprocally movable on the inner peripheral side of the outer peripheral surface, the support part is a part near the forward end part of the movable core sucked by the suction part end part. The load acting in the radial direction can be reliably supported by the concentration of the side force. According to this, since the sliding friction between the movable core and the accommodating portion due to the side force can be reduced, it is possible to contribute to the improvement of the drive response and the durability of the movable body having the movable core. .

The invention described in claim 7 includes an electromagnetic drive device and a valve portion that opens and closes a port through which a fluid flows according to the reciprocating movement of the movable body. In the electromagnetic valve according to the present invention, the electromagnetic driving device can control the fluid flow in the port by opening and closing the port of the valve unit in accordance with the reciprocating movement of the movable body. Here, in the electromagnetic drive device, not only can the side force to the movable core be reduced even when the movable core and the fixed core are eccentric to each other, but also the density of the passing magnetic flux in the suction portion can be increased and the number of turns of the coil can be increased. Thus, drive response and durability can be improved. Therefore, in the fluid flow control realized by such an electromagnetic drive device, high control responsiveness can be exhibited for a long time.

It is sectional drawing which shows the solenoid valve by 1st embodiment of this invention. It is sectional drawing which shows the operation state different from FIG. It is sectional drawing which expands and shows the principal part of FIG. It is sectional drawing which expands and shows the principal part of FIG. It is sectional drawing which expands and shows the principal part of the solenoid valve by 2nd embodiment of this invention. It is sectional drawing which expands and shows the principal part of the modification of FIG. It is sectional drawing which expands and shows the principal part of the other modification of FIG.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description may be abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment. When only a part of the configuration is described in each embodiment, the configuration of the other embodiment described above can be applied to the other part of the configuration. In addition, not only combinations of configurations explicitly described in the description of each embodiment, but also the configurations of a plurality of embodiments can be partially combined even if they are not explicitly specified unless there is a problem with the combination. .

(First embodiment)
FIG. 1 shows a solenoid valve 1 according to a first embodiment of the present invention. The electromagnetic valve 1 is used as a fluid control valve that constitutes, for example, a hydraulic control device of a vehicle automatic transmission. The electromagnetic valve 1 formed by combining the electromagnetic driving device 10 and the valve unit 100 opens and closes the ports 121, 122, 123, 124, 125 of the valve unit 100, so that these ports 121, 122, 123, 124, The fluid flow at 125 is controlled.

(Explanation of valve part)
As shown in FIGS. 1 and 2, the valve unit 100 of the electromagnetic valve 1 includes a sleeve 120, a spool 110, a return spring 130, and the like.

  The sleeve 120 is formed of a metal in a cylindrical shape, and supports the spool 110 by sliding from the outer peripheral side. The sleeve 120 is formed with an input port 121, an output port 122, a feedback port 123, and discharge ports 124 and 125 penetrating in the radial direction. The input port 121 receives hydraulic oil from an oil supply source (not shown). The output port 122 outputs hydraulic oil to the output target. The feedback port 123 communicates with the output port 122 outside the electromagnetic valve 1, and a part of the hydraulic oil output from the output port 122 is input. The discharge ports 124 and 125 discharge the hydraulic oil leaking from the adjacent ports 122 and 123 in the axial direction through the sleeve 120 and the spool 110 to an oil pan (not shown).

  The spool 110 is formed of a metal in a cylindrical shape, is accommodated substantially coaxially on the inner peripheral side of the sleeve 120, and is reciprocally movable in the axial direction. One end surface of the spool 110 is in contact with one end surface of the shaft 24 of the movable body 20 described later among the components of the electromagnetic driving device 10. Therefore, the force acting on the spool 110 by driving the movable body 20 is an axial force that presses the spool 110 to the side opposite to the electromagnetic drive device 10 (here, the left direction in FIGS. 1 and 2). In addition, the hydraulic pressure of the hydraulic oil input from the feedback port 123 acts on the lands 150, 152 among the lands 150, 152, 154 supported by the sleeve 120 in the spool 110. Here, the pressure receiving areas where the lands 150 and 152 receive the hydraulic pressure are different. Therefore, the force acting on the spool 110 by the hydraulic pressure from the feedback port 123 is also an axial force that presses the spool 110 to the side opposite to the electromagnetic drive device 10.

  The return spring 130 is made of a metal compression coil spring, and is disposed on the opposite side of the electromagnetic drive device 10 with the spool 110 interposed therebetween. One end of the return spring 130 is locked by a retainer 140 fixed to the sleeve 120. The restoring force that acts on the spool 110 due to the elastic deformation of the return spring 130 becomes an axial force that presses the spool 110 toward the electromagnetic drive device 10 (here, the right direction in FIGS. 1 and 2).

  With the above configuration, the spool 110 is located at a position where the axial force generated by driving the movable body 20 of the electromagnetic drive device 10, the axial force generated by the hydraulic pressure from the feedback port 123, and the axial force generated by the restoring force of the return spring 130 are balanced. It reciprocates like 1 and 2. As the spool 110 reciprocates, the amount of hydraulic fluid flowing from the input port 121 to the output port 122 decreases or increases, and the hydraulic pressure of the hydraulic fluid output from the output port 122 increases or decreases.

(Electromagnetic drive device)
As shown in FIGS. 1 and 2, in the electromagnetic valve 1, the electromagnetic driving device 10 includes a movable body 20, a fixed core 30, a yoke 40, a ring core 50, a coil 70, and the like.

  The movable body 20 has a movable core 22 and a shaft 24 that is coaxially connected to the movable core 22. The movable core 22 is formed in a cylindrical shape by a magnetic material such as iron and is accommodated on the inner peripheral side of the fixed core 30 so as to be reciprocally movable in the axial direction. Therefore, in the present embodiment, the direction indicated by the arrow Dg in FIGS. 1 and 2 among the axial directions of the movable core 22 is defined as the “forward direction Dg”, and the direction indicated by the arrow Dr in FIGS. It is defined as

  The shaft 24 is formed of a metal in a cylindrical shape, and is fitted and fixed to the movable core 22. The shaft 24 abuts the end surface in the forward direction Dg on the end surface of the spool 110, thereby transmitting the driving force in the forward direction Dg generated in the movable core 22 to the spool 110 as will be described in detail later.

  The fixed core 30 is formed in a cylindrical shape by a magnetic material such as iron, and has a housing portion 32 and a suction portion 34 side by side in the axial direction. The accommodating portion 32 forms a cylindrical support hole 32a having a substantially constant inner diameter in the axial direction, thereby accommodating the movable core 22 so as to be reciprocally movable in the axial direction and supporting the same in a coaxial manner. .

  The suction part 34 is connected to the accommodating part 32 in the forward direction Dg. The suction part 34 forms a cylindrical suction hole 34d having a constant inner diameter in the axial direction that is substantially the same as the support hole 32a of the housing part 32, so that the movable core 22 slides relative to the suction hole 34d. It is possible to enter on the same axis. The suction part 34 forms a suction surface 34a substantially perpendicular to the end of the suction hole 34d in the forward direction Dg, and the suction surface 34a is opposed to the movable core 22 in the forward direction Dg. With these configurations, the magnetic flux MF (see the arrow in FIG. 3) generated by the coil 70 is transferred from the movable core 22 to the suction portion 34, so that an attraction force is generated between at least one of the suction hole 34d and the suction surface 34a. The movable core 22 in which is generated is attracted in the forward direction Dg.

  The yoke 40 is formed in a bottomed cylindrical shape using a magnetic material such as iron, and houses the movable core 22, the fixed core 30, the ring core 50, the coil 70, and the like. The suction portion 34 of the fixed core 30 is fixed to the opening of the yoke 40 by caulking, whereby the suction portion 34 and the yoke 40 are magnetically connected.

  The ring core 50 is formed in an annular shape from a magnetic material such as iron, and is disposed on the opposite side of the suction portion 34 with the coil 70 sandwiched in the axial direction. The ring core 50 sandwiches the elastic member 52 between the ring core 50 and the resin insulating material 72 covering the coil 70 on the outer peripheral side of the housing portion 32. The ring core 50 is pressed against the bottom of the yoke 40 by receiving the restoring force of the elastic member 52 in the backward direction Dr. As a result, the ring core 50 is reduced in axial deviation on the outer peripheral side with respect to the housing portion 32 of the fixed core 30 and magnetically connects the housing portion 32 and the yoke 40.

  The coil 70 is formed by winding a conductive wire such as an enamel wire around a resin insulating material 72 and is coaxially disposed on the outer peripheral side of the housing portion 32 in the fixed core 30. When the coil 70 is energized through a terminal 74 embedded in the resin insulating material 72, the yoke 40, the ring core 50, the receiving portion 32 of the fixed core 30, the movable core 22 and the suction portion 34 of the fixed core 30 are shown in FIG. A magnetic flux MF that sequentially passes as indicated by the arrow of FIG. As a result, the attractive force acting between the attractive portion 34 and the movable core 22 increases as the density of the passing magnetic flux MF increases along with the energization current to the coil 70. The movable body 20 integrally having the movable core 22 that receives such a suction force is driven in the forward direction Dg from the housing portion 32 side toward the suction portion 34 side in the axial direction. 2 shows a state in which the movable body 20 is sucked and driven by the suction portion 34 in the forward direction Dg by energization of the coil 70, and FIG. 1 shows that the return spring 130 of the valve portion 100 is stopped by the deenergization. The state is shown in which the movable body 20 receiving the restoring force is driven to return in the backward direction Dr.

(Feature)
Next, the characteristic part of 1st embodiment of this invention is demonstrated based on FIG. 3 shows a state in which the movable body 20 is driven to return in the backward direction Dr as a partially enlarged view of FIG. 1, and FIG. 4 shows a partially enlarged view of FIG. A state in which suction is driven by the suction unit 34 is shown.

  The suction part 34 as a characteristic part in the fixed core 30 has an outer peripheral surface 34b that gradually increases in diameter in the axial direction as being separated from the housing part 32 in the forward direction Dg, coaxially formed on the outer peripheral side of the suction hole 34d. Yes. Here, in particular, the outer peripheral surface 34b of the present embodiment has a unit length in the forward direction Dg starting from the minimum diameter portion 34c having the smallest outer diameter in the forward direction Dg than the coil 70 on the outer peripheral side of the housing portion 32. The expansion ratio, which is the rate of change of the outer diameter with respect to, is formed so as to be substantially constant in the same direction Dg. Due to the formation of the outer peripheral surface 34b and the above-described formation of the suction hole 34d having a substantially constant outer diameter in the axial direction, the suction portion 34 is separated in the radial direction from the housing portion 32 in the forward direction Dg. It is gradually increased according to At the same time, in the suction portion 34 of the present embodiment, the minimum diameter portion 34c of the outer peripheral surface 34b is located between the coil 70 and the suction surface 34a, so that it is close to the forward direction Dg with respect to the suction surface 34a. As the thickness in the radial direction increases, the passage area of the magnetic flux MF increases.

  The suction part 34 further has a support part 34e formed in an annular shape that protrudes further to the inner peripheral side than the suction face 34a on the inner peripheral side of the outer peripheral face 34b. The support portion 34e supports the shaft 24 of the movable body 20 so as to be reciprocally movable coaxially from the outer peripheral side. At the moving end in the backward direction Dr of the movable body 20 supported in this manner, as shown in FIG. 3, the backward direction Dr of the suction part 34 that forms the minimum diameter part 34c from the end in the forward direction Dg of the movable core 22 is provided. The distance to the end is set to such a distance that the magnetic flux MF generated in response to energization of the coil 70 can be transferred from the movable core 22 to the suction unit 34.

  The accommodating portion 32 as another characteristic portion in the fixed core 30 is formed by coaxially forming an outer peripheral surface 32b having a substantially constant outer diameter in the axial direction on the outer peripheral side of the support hole 32a having a substantially constant inner diameter in the axial direction. Yes. Here, in particular, the outer peripheral surface 32 b of the present embodiment is set to have substantially the same outer diameter as the smallest diameter portion 34 c of the outer peripheral surface 34 b of the suction portion 34. As a result, the radial thickness of the accommodating portion 32 is narrowed in the entire area in the axial direction, rather than the radial thickness of the suction portion 34 that is the thinnest at the location where the minimum diameter portion 34c is formed. At the same time, the radial thickness of the accommodating portion 32 in the present embodiment is set to be thinner than the radial thickness of the movable core 22.

  From the above configuration, in the fixed core 30, the thickness of the suction portion 34 is larger than the radial thickness of the housing portion 32 squeezed more than the suction portion 34. The magnetic flux MF generated by the energization is more likely to flow from the movable core 22 to the suction portion 34 than from the housing portion 32. Therefore, even when the movable core 22 and the fixed core 30 are decentered from each other, the magnetic flux MF from the movable core 22 is difficult to be transferred to the outer accommodating portion 32, and is away from the accommodating portion 32 in the forward direction Dg. Can be concentrated and delivered to the suction part 34 of the connection. As a result, the side force that presses the movable core 22 against the housing portion 32 on the outer peripheral side is reduced, so that the drive response of the movable body 20 having the movable core 22 can be improved. Further, since the side force is reduced, the sliding friction between the movable core 22 and the accommodating portion 32 is reduced, so that the durability of the electromagnetic driving device 10 can be improved.

  Here, when the movable core 22 and the fixed core 30 are eccentric, the side force is the end of the movable core 22 in the forward direction Dg and the end of the suction portion 34 in the backward direction Dr (accommodating portion 32 side). Since it is generated in the radial direction when sucked by the nozzle, it tends to concentrate on these end portions and act. However, in the movable body 20 in which the suction portion 34 is supported by the support portion 34e on the inner peripheral side of the outer peripheral surface 34b so as to be reciprocally movable, the support portion is movable to be sucked to the end portion of the suction portion 34 in the backward direction Dr. It is a location near the end of the core 22 in the forward direction Dg. As a result, the load acting in the radial direction due to the concentration of the side force is surely supported by the end of the suction portion 34 to be concentrated, so that the movable core 22 and the accommodating portion 32 caused by the side force are Sliding friction can be reduced. Therefore, it is possible to contribute to improvement of drive response and durability of the movable body 20 having the movable core 22.

  Furthermore, in the housing portion 32 having a radial thickness that is narrower than the suction portion 34 in the fixed core 30, the magnetic flux MF generated by the coil 70 that is transferred from the ring core 50 to the housing portion 32 is reduced in the axial direction. Difficult to diffuse. Therefore, even when the movable core 22 and the fixed core 30 are decentered from each other, the magnetic flux MF from the ring core 50 can be passed through the accommodating portion 32 in the substantially radial direction and concentratedly delivered to the movable core 22. . Also by this, the side force that presses the movable core 22 against the outer circumferential side accommodating portion 32 is reduced, so that the drive response of the movable body 20 can be improved and the durability can be improved by reducing the sliding friction.

  Still further, in the suction portion 34 of the fixed core 30, an increase in the radial thickness is realized by increasing the diameter of the outer peripheral surface 34 b according to the separation in the forward direction Dg from the housing portion 32. The passing area of the passed magnetic flux MF increases with the separation. Thereby, the density of the passing magnetic flux MF in the suction part 34 can be increased, and the suction force for driving the movable core 22 by suction can be increased. Here, in particular, in the suction portion 34 of the present embodiment, the magnetic flux MF is smooth along the outer peripheral surface 34b that realizes a gradual expansion at a constant expansion rate according to the separation in the forward direction Dg from the storage portion 32. Therefore, it is possible to ensure the attraction force. Further, the suction portion 34 of the present embodiment increases in thickness toward the suction surface 34a side in the forward direction Dg, starting from the minimum diameter portion 34c that deviates in the forward direction Dg from the inner peripheral side of the coil 70. Therefore, the amount of increase in the passage area of the magnetic flux MF that enhances the attractive force can be increased as much as possible. According to these, it is possible to improve the drive response of the movable body 20 having the movable core 22 that receives the suction force.

  In addition, in the fixed core 30, the suction portion 34 is positioned in the forward direction Dg with respect to the coil 70 and is surely detached from the inner peripheral side of the coil 70, so that the radial thickness of the housing portion 32 relative to the suction portion 34 is increased. The aperture amount can be increased as much as possible. As a result, the number of turns of the coil 70 can be increased and the density of the magnetic flux MF itself generated by the coil 70 can be increased, so that the drive response can be improved by further increasing the attractive force.

  According to the electromagnetic valve 1 described so far, the fluid flow in the valve unit 100 is controlled by the electromagnetic drive device 10 with improved drive response and durability. Therefore, the high control response for the fluid flow is long. It can be demonstrated over a long time.

(Second embodiment)
As shown in FIG. 5, the second embodiment is a modification of the characteristic portion of the first embodiment. The suction part 2034 of the second embodiment reduces the diameter expansion rate in accordance with the separation in the forward direction Dg with respect to the outer peripheral surface 2034b that gradually increases in diameter in the axial direction as it moves away from the housing part 32 in the forward direction Dg. . Here, the maximum diameter portion 2034f set at a predetermined distance away from the minimum diameter portion 34c in the forward direction Dg among the gradually expanded diameter portion of the outer peripheral surface 2034b is the gradually expanded diameter portion of the outer peripheral surface 34b of the first embodiment. Are set to substantially the same outer diameter with respect to the same maximum diameter portion.

  In the suction part 2034 in which the diameter expansion rate of the outer peripheral surface 2034b decreases as the outer diameter is set in the forward direction Dg from the housing part 32, the case of the first embodiment shown by the two-dot chain line in FIG. However, the radial thickness increases. According to this, with respect to the magnetic flux MF that easily passes smoothly along the outer peripheral surface 2034b that realizes gradual diameter expansion, the passage area in the suction portion 2034 can be further increased, and the attraction force enhancing action can be enhanced. . Therefore, it is possible to more effectively improve the drive response of the movable body 20 having the movable core 22 that receives the suction force.

(Other embodiments)
Although a plurality of embodiments of the present invention have been described above, the present invention is not construed as being limited to these embodiments, and various embodiments and combinations can be made without departing from the scope of the present invention. Can be applied.

  Specifically, as shown in a modified example in FIG. 6, the outer peripheral surface 34 b of the suction portion 34 in the fixed core 30 is gradually increased in diameter as it is separated from the housing portion 32 in the forward direction Dg. The thickness in the radial direction 34 may be increased stepwise. Further, as shown in FIG. 7, the outer peripheral surface 34 b of the suction portion 34 gradually increases in diameter according to the separation in the direction Dg and sucks so that the diameter expansion rate increases as the separation in the forward direction Dg. The radial thickness of the portion 34 may be gradually increased.

DESCRIPTION OF SYMBOLS 1 Solenoid valve, 10 Electromagnetic drive device, 20 Movable body, 22 Movable core, 24 Shaft, 30 Fixed core, 32 Accommodating part, 32a Support hole, 32b Outer surface, 34, 2034 Suction part, 34a Suction surface, 34b, 2034b Outer periphery Surface, 34c Minimum diameter part, 34d Suction hole, 34e Support part, 2034f Maximum diameter part, 40 Yoke, 50 Ring core, 70 Coil, 100 Valve part, 110 Spool, 120 Sleeve, 121 Input port, 122 Output port, 123 Feedback port , 124, 125 discharge port

Claims (7)

A movable body having a movable core and reciprocating in the axial direction of the movable core;
A fixed core having a cylindrical accommodating portion that accommodates the movable core in a reciprocating manner on the same axis, and a suction portion that sucks the movable core in the forward direction in the axial direction;
A coil that is provided on the outer peripheral side of the housing portion and generates a magnetic flux by energization ;
The movable core, the fixed core, and the yoke that accommodates the coil and that is magnetically connected to the attraction unit are provided, and the magnetic flux generated by the coil is transferred to the attraction unit through the movable core. In the electromagnetic drive device in which the movable core is driven to be sucked by the suction portion,
The suction part forms an outer peripheral surface that increases the thickness in the radial direction of the suction part by increasing the diameter of the outer peripheral surface as it is separated from the housing part in the forward direction,
The accommodating portion is connected to the suction portion in the forward direction with a radial thickness that is narrower than the suction portion ;
In the suction part, the minimum diameter part of the outer peripheral surface is located in the forward direction from the coil,
In the suction portion, the radial thickness of the portion where the outer peripheral surface is most expanded is larger than the axial length of the region where the suction portion and the yoke are magnetically connected. The electromagnetic drive device according to claim 1. The suction portion forms a suction surface that sucks the movable core while facing the movable core in the forward direction,
  The electromagnetic drive device according to claim 1, wherein the minimum diameter portion of the outer peripheral surface is located between the coil and the suction surface in the axial direction. A ring core provided on the opposite side of the suction portion with the coil sandwiched in the axial direction;
  3. The electromagnetic drive device according to claim 1, wherein the magnetic flux generated by the coil passes from the ring core to the attraction portion through the housing portion and the movable core. 4. The electromagnetic driving device according to claim 1, wherein the outer peripheral surface of the suction portion gradually increases in diameter as it is separated from the housing portion in the forward direction. 5. The electromagnetic drive device according to claim 4, wherein the suction part gradually increases in diameter so that the diameter expansion rate of the outer peripheral surface is constant or decreases as the suction part is separated from the storage part. The electromagnetic drive device according to claim 1, wherein the suction unit supports the movable body so as to be reciprocally movable on an inner peripheral side of the outer peripheral surface. The electromagnetic drive device according to any one of claims 1 to 6,
  An electromagnetic valve comprising: a valve portion that opens and closes a port through which a fluid flows according to the reciprocating movement of the movable body.

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