JP6171918B2 - Electromagnetic drive device and solenoid valve - Google Patents

Description

  The present invention relates to an electromagnetic drive device that moves a plunger in an axial direction by a magnetic flux generated along with energization of a coil, and an electromagnetic valve including the same.

  Conventionally, as this type of solenoid valve, a movable body (plunger) having a movable core and a shaft fixed to the movable core, a housing portion for housing the movable core so as to be movable in a forward direction and a multi-direction, and A fixed core having a suction portion that sucks the movable core in the forward direction, a coil that is provided on the outer peripheral side of the stationary core housing portion and generates magnetic flux when energized, and a bottomed cylinder that houses the movable body, the stationary core, and the coil And a ring core provided between the coil and the yoke on a multi-directional side (bottom side of the yoke) on the outer peripheral side of the fixed core housing portion on the multi-directional side (the yoke bottom side). (For example, refer to Patent Document 1). In this solenoid valve, the magnetic flux generated by energizing the coil is transferred to the suction portion of the fixed core via the yoke, the ring core, the housing portion of the fixed core, and the movable core, thereby attracting the movable body (plunger). Suctioned to the side.

JP 2013-38233 A

  In the conventional solenoid valve, if the number of turns of the coil is reduced, the size of the coil can be reduced. However, the decrease in the number of turns of the coil is caused by a decrease in magnetic flux generated by energization of the coil, that is, a movable body (plunger). ) Will be reduced. On the other hand, if the axial length of the portion located axially outside the yoke, ring core, and fixed core coil is shortened, the solenoid valve can be reduced in size without reducing the number of turns of the coil. However, in this case, the axial length of the contact portion between the ring core and the fixed core is shortened, and the magnetic flux cannot be successfully transferred from the ring core to the fixed core. As a result, the attractive force for moving the plunger There is a risk that sufficient (driving force) cannot be secured.

  Therefore, the main object of the present invention is to shorten the axial length of the electromagnetic drive device and the electromagnetic valve while ensuring better driving force for moving the plunger.

The electromagnetic drive device according to the present invention is:
A cylindrical fixed core, a cylindrical coil arranged so as to surround the fixed core, a plunger arranged inside the fixed core so as to be movable in the axial direction, the fixed core, In an electromagnetic drive device that includes a coil and a bottomed cylindrical case that accommodates the plunger, and moves the plunger in the axial direction by a magnetic flux generated along with energization of the coil.
The case has an inner wall surface facing one end surface in the axial direction of the coil, and an annular portion into which one end of the fixed core is fitted.
The one end surface of the coil is inclined so as to approach the other end surface of the coil from the outer peripheral side toward the inner peripheral side,
The annular portion of the case is formed so as to approach the other end surface of the coil and incline along the one end surface as the inner wall surface moves from the outer peripheral side to the inner peripheral side. To do.

  Thus, when one end face of the coil is inclined so as to approach the other end face as it goes from the outer peripheral side to the inner peripheral side, the number of turns on the inner peripheral side of the coil is reduced on the one end face side and the coil By increasing the number of turns on the outer peripheral side of the coil, it is possible to maintain the same number of turns as the coil having the end face that is formed orthogonal to the axial direction without reducing the number of turns of the entire coil. Thereby, in this electromagnetic drive device, the driving force for moving the plunger can be sufficiently secured. In addition, the inner wall surface of the annular portion of the case formed along one end surface of the coil is inclined so as to approach the other end surface of the coil as it goes from the outer peripheral side to the inner peripheral side. The coil side end of the contact portion between the surface and the fixed core, that is, the magnetic flux passing portion for transferring the magnetic flux from the annular portion to the fixed core, is on the other end surface side of the coil (center side in the axial direction of the case) Can be sent to. Thereby, the axial length of the case can be shortened while the entire annular portion is brought close to the other end surface side of the coil and the axial length of the magnetic flux transfer portion on the one end surface side of the coil is secured. Therefore, in this electromagnetic drive device, it is possible to shorten the shaft length while ensuring better driving force for moving the plunger.

It is a schematic block diagram which shows the solenoid valve containing the solenoid part as an electromagnetic drive device which concerns on one Embodiment of this invention. It is an expanded partial sectional view which shows the principal part of the solenoid part contained in the solenoid valve of FIG. It is explanatory drawing which shows the flow of the magnetic flux in the solenoid part of the solenoid valve of FIG. It is explanatory drawing which shows the flow of the magnetic flux in the solenoid part of a comparative example. It is an expanded partial sectional view which shows the principal part of the solenoid part which concerns on other embodiment. It is an expanded fragmentary sectional view which shows the principal part of the solenoid part which concerns on other embodiment. It is an expanded partial sectional view which shows the principal part of the solenoid part which concerns on other embodiment.

  Next, the form for implementing this invention is demonstrated, referring drawings.

  FIG. 1 is a schematic configuration diagram showing an electromagnetic valve 1 including a solenoid unit 10 as an electromagnetic drive device according to an embodiment of the present invention. The electromagnetic valve 1 shown in the figure is configured as a normally open linear solenoid valve used for hydraulic control of a clutch or a brake incorporated in an automatic transmission for a vehicle, for example. As shown in FIG. 1, the electromagnetic valve 1 includes a solenoid unit 10 and a valve unit 20 that is driven by the solenoid unit 10 and that regulates and outputs a hydraulic pressure.

  The solenoid unit 10 includes a cylindrical fixed core 11, a cylindrical coil 12 arranged so as to surround the fixed core 11, and a plunger 13 arranged inside the fixed core so as to be movable in the axial direction. And a shaft 14 that moves in the axial direction in conjunction with the plunger 13, and a bottomed cylindrical case 15 that houses the fixed core 11, the coil 12, the plunger 13, and the shaft 14. The fixed core 11, the plunger 13, and the case 15 are made of a ferromagnetic material such as iron.

  The fixed core 11 includes first and second cylindrical portions 111 and 112 that are formed in a hollow shape, and a flange portion 113 that extends radially outward from one end of the second cylindrical portion 112. The first cylindrical portion 111 has a first center hole 111 o that opens at the other end opposite to the flange portion 113. In addition, an annular recess 111 a that is recessed toward the inner peripheral side is formed along the circumferential direction on the outer peripheral surface at the substantially central portion in the axial direction of the first cylindrical portion 111. The second cylindrical portion 112 has a second center hole 112o that communicates with the first center hole 111o and opens at one end on the flange portion 113 side. The second center hole 112o is formed to have a smaller inner diameter than the first center hole 111o. The flange portion 113 extends from the second cylindrical portion 112 substantially over the entire circumference, but a part thereof is cut away as shown in FIG. Further, a plurality of (two in this embodiment) through holes 113o are formed in the flange portion 113.

  The coil 12 includes a resin insulating part 121 composed of a bobbin 122 and a resin material 123, and a film conductor (wire) 124 wound around the bobbin 122. The bobbin 122 constituting the resin insulating portion 121 is a cylindrical member having flange portions 122 f formed at both end portions in the axial direction, and is made of the same nonmagnetic material as the resin material 123. The coil 12 is formed by fitting the bobbin 122 around which the coated conductor 124 is wound to the outer periphery of the first and second cylindrical portions 111 and 112 of the fixed core 11, and then the resin material 123 with the bobbin 122, the coated conductor 124 and By molding around the fixed core 11, the fixed core 11 is integrated (fixed). At this time, the resin material 123 flows into the plurality of through holes 113o formed in the flange portion 113 of the fixed core 11 and solidifies, so that the fixed core 11 is firmly prevented from coming off from the coil 12. Further, the resin insulation part 121 has a connector part 121 a for connecting the end part of the coated conductor 124, that is, the coil 12 to an electrical device outside the case 15. The connector part 121 a extends outside the case 15 via a flange part 113 of the fixed core 11 and a notch part formed in the case 15.

  The plunger 13 is disposed in a first center hole 111 o formed in the first cylindrical portion 111 of the fixed core 11, and is supported by the inner peripheral surface of the first cylindrical portion 111 so as to be movable in the axial direction. Further, the shaft 14 is inserted into a second center hole 112o formed in the second cylindrical portion 112 of the fixed core 11 so as to contact the end portion of the plunger 13 on the valve portion 20 side, and the second cylindrical shape. The portion 112 is supported so as to be movable in the axial direction.

  The case 15 includes a cylindrical portion 151 into which the flange portion 113 of the fixed core 11 is fitted, a bottom portion 152 extending in the radial direction from the cylindrical portion 151, a bottom portion 152, and the coil 12 (resin insulating portion 121). It includes a separate ring core (annular member) 16 that is disposed between one end surface (right end surface in FIG. 1) 12a and fitted into the cylindrical portion 151. The cylindrical portion 151 is formed with the above-described notch for extending the connector portion 121 a formed in the resin insulating portion 121 of the coil 12 to the outside of the case 15. Further, the first cylindrical portion 111 of the fixed core 11 is fitted into the ring core 16. Thereby, since the 1st cylindrical part 111 can be easily fitted to the ring core 16 using slight backlash between the case 15 and the ring core 16, each of the fixed core 11, the case 15, and the ring core 16 Can reduce the processing accuracy required.

  In the solenoid unit 10 configured as described above, the cylindrical portion 151 of the case 15, the bottom portion 152, the ring core 16, and the first cylinder of the fixed core 11 are provided when the coated conductor 124 of the coil 12 is energized via the connector portion 121 a. 111 (the axial direction bottom 152 side of the annular recess 111a), the plunger 13, the first cylindrical part 111 of the fixed core 11 (the axial flange part 113 side of the annular recess 111a), and the second cylindrical part A magnetic circuit through which magnetic flux flows is formed so as to go around the coil 12 in the order of 112 and the flange portion 113. Thereby, a suction force acts between the fixed core 11 and the plunger 13, and the plunger 13 is sucked along the axial direction toward the side opposite to the bottom 152 of the case 15 (the flange 113 side of the fixed core 11). And the shaft 14 moves in the same direction in conjunction with the plunger 13.

  The valve unit 20 includes a hollow cylindrical sleeve 21 incorporated in a valve body (not shown), a spool 22 disposed in the sleeve 21 so as to be movable in the axial direction, and an end of the sleeve 21 opposite to the solenoid unit 10. And an end plate 23 fixed to the portion, and a spring 24 disposed between the spool 22 and the end plate 23 to urge the spool 22 toward the solenoid portion 10.

  The sleeve 21 is formed in the vicinity of the input port 211 for inputting the hydraulic oil, the output port 212 for outputting the hydraulic oil in the vicinity of the input port 211, and formed in the vicinity of the output port 212 and operated from the sleeve 21. A drain port 213 for draining oil, a feedback port 214 for inputting a part of hydraulic oil input from the input port 211 via an oil passage formed on the outer peripheral surface of the sleeve 21, and the sleeve 21 and the spool 22. Discharge ports 215 and 216 for discharging hydraulic oil leaking from the outside to the outside of the sleeve 21 are provided.

  As shown in FIG. 1, the spool 22 is formed in the sleeve 21, a land 221 that can open and close a feedback port 214 formed in the sleeve 21, a land 222 that can open and close an input port 211 formed in the sleeve 21, and the sleeve 21. The land 223 that can open and close the drain port 213, the first reduced diameter portion 224 that connects the land 221 and the land 222, and the second reduced diameter portion 225 that connects the land 222 and the land 223. The spool 22 is disposed in the sleeve 21 so that the end on the solenoid unit 10 side contacts the tip of the shaft 14.

  In the present embodiment, the land 223 is formed in a bottomed cylindrical shape, and the inner bottom surface of the land 223 comes into contact with one end of the spring 24. The first reduced diameter portion 224 is formed so as to have an outer diameter smaller than that of the land 221 and the land 222, whereby the first reduced diameter portion 224 has a feedback chamber that applies a feedback force to the spool 22. Define with sleeve 21. The second reduced diameter portion 225 is formed so that the outer diameter decreases from the land 222, 223 toward the center. Thus, the second reduced diameter portion 225 defines a communication chamber that communicates with the input port 211 and the output port 212, the output port 212, and the drain port 213 together with the sleeve 21.

  The end plate 23 is screwed into a thread portion formed at the end portion of the sleeve 21. Thereby, the biasing force to the spool 22 by the spring 24 can be adjusted by adjusting the fixing position of the end plate 23 in the axial direction. The valve portion 20 is in contact with the end surface of the fixed core 11 of the solenoid portion 10 and the end portion of the cylindrical portion 151 of the case 15 with the spool 22 in contact with the tip end of the shaft 14. Is fixed to the solenoid part 10 by caulking from the outer peripheral side.

  In the solenoid valve 1 including the solenoid unit 10 and the valve unit 20 configured as described above, the spool 22 is moved to the solenoid unit 10 side by the biasing force of the spring 24 when the coil 12 of the solenoid unit 10 is not energized. The feedback port 214 and the input port 211 are opened, and the drain port 213 is closed by the land 223 (see FIG. 1). As a result, when the coil 12 is not energized, the input port 211 and the output port 212 are communicated via the communication chamber, the communication between the drain port 213 and the communication chamber is blocked, and the hydraulic oil supplied to the input port 211 Is output from the output port 212.

  On the other hand, when the coil 12 of the solenoid unit 10 is energized, the plunger 13 and the shaft 14 are sucked (driven) along the axial direction toward the valve unit 20, and the spool 22 is pressed by the plunger 13 and the shaft 14. The The spool 22 moves to the side opposite to the solenoid unit 10 against the biasing force of the spring 24 as the suction force (driving force) to the plunger 13 increases. Thus, when the suction force (driving force) of the solenoid unit 10 reaches a predetermined value, the feedback port 214 and the input port 211 are closed by the land 221 and the land 222, and the drain port 213 is opened. As a result, the communication between the input port 211 and the output port 212 is blocked, the drain port 213 and the communication chamber are communicated, and the hydraulic oil in the communication chamber is drained to the outside of the sleeve 21 via the drain port 213. Is done.

  Next, the configuration of the solenoid unit 10 of the electromagnetic valve 1 of the present embodiment will be described in detail with reference to FIG. FIG. 2 is an enlarged partial cross-sectional view showing a configuration in the vicinity of the end surface 12a on the opposite side of the valve portion 20 of the coil 12 included in the solenoid portion 10 and the ring core 16.

  As shown in the drawing, one end surface 12a of the coil 12, that is, the resin insulating portion 121 is inclined so as to approach the other end surface 12b (see FIG. 1) of the coil 12 from the outer peripheral side toward the inner peripheral side. That is, in the present embodiment, the flange portion 122f formed at one end of the bobbin 122 constituting the coil 12 (the end on the bottom 152 side of the case 15) has an inclination angle α of 60 ° with respect to the axial direction. Incline at. Further, on one end side of the bobbin 122, the coated conductor 124 is aligned and wound so that the number of turns increases from the inner peripheral side toward the outer peripheral side along the flange portion 122f. Specifically, as shown in FIG. 2, the coated conductor 124 has a portion located on the outermost side (right side in the drawing) in the axial direction on the end surface 12a side from the inner peripheral side to the outer peripheral side and the outer side in the axial direction (see FIG. It is wound along the inner surface (upper surface in the drawing) of the flange portion 122f so as to increase by one turn from the middle left side toward the right side. And the resin material 123 which comprises the resin insulation part 121 is molded so that it may have an end surface parallel to the outer surface of the flange part 122f. Thereby, the coil 12 can be easily formed so that one end face 12a has an inclination angle α of 60 ° with respect to the axial direction.

  Thus, when one end surface 2a of the coil 12 is inclined so as to approach the other end surface 12b from the outer peripheral side toward the inner peripheral side, the number of turns on the inner peripheral side of the coil 12 on the one end surface 12a side. 2 and an increase in the number of turns on the outer periphery side of the coil 12, thereby reducing the coil 12B having the end face 12Ba formed so as to be orthogonal to the axial direction without reducing the number of turns of the entire coil 12 (coarse in FIG. 2). This can be maintained in the same manner as in the broken line). Thereby, in the solenoid part 10 of the solenoid valve 1, the attraction | suction force (driving force) for moving the plunger 13 is fully securable.

  Note that the inclination angle α of the end face 12a of the coil 12 is not limited to the above-described 60 °, and may be changed within a range in which the coated conductor 124 can be aligned and wound around the bobbin 122. For example, the coating conductor is such that the portion located on the outermost side in the axial direction (right side in FIG. 2) increases by two turns from the inner peripheral side toward the outer peripheral side and outward in the axial direction (left side to right side in FIG. 2). By winding 124 along the inner surface of the flange portion 122f, the end face 12a can be formed to have an inclination angle α of 30 °. In this way, by adjusting the degree of increase in the number of turns of the coated conductor 124 in the axial direction and the radial direction of the coil 12, the inclination angle α of the one end face 12a of the coil 12 can be easily and appropriately set. Become.

  In the electromagnetic valve 1, the ring core 16 disposed between the bottom 152 of the case 15 and the coil 12 has an inner wall surface 16 a that faces one end surface 12 a of the coil 12. Similarly to the end surface 12a of the coil 12, the inner wall surface 16a approaches the other end surface 12b of the coil 12 from the outer peripheral side toward the inner peripheral side, that is, along the end surface 12a of the coil 12 with respect to the axial direction. It is formed so as to be inclined at an inclination angle α of 60 °. Furthermore, the ring core 16 is formed so that the axial length becomes shorter from the inner peripheral side toward the outer peripheral side, and the end surface of the ring core 16 located on the side opposite to the inner wall surface 16a is formed to be orthogonal to the axial direction. ing.

  In this way, the other end of the coil 12 is moved from the outer peripheral side toward the inner peripheral side of the one end surface 12a of the coil 12 and the inner wall surface 16a of the ring core 16 of the case 15 formed along the one end surface 12a. By inclining so as to approach the end surface 12a, a contact portion between the inner peripheral surface of the ring core 16 and the first cylindrical portion 111 of the fixed core 11, that is, a magnetic flux transfer portion that transfers magnetic flux from the ring core 16 to the fixed core 11. It is possible to bring the tip end portion A1 on the coil 12 side of A closer to the other end surface 12b of the coil 12 (approach to the central portion side in the axial direction of the case 15). As a result, even if the entire ring core 16 is moved inward in the axial direction and the axial length of the case 15 is shortened by that amount (see the solid arrow in FIG. 2), the axial length L of the magnetic flux transfer section A is sufficiently secured ( 2 can be the same length as the magnetic flux transfer portion of the solenoid portion 10B indicated by a rough broken line in FIG.

  Here, FIG. 3 and FIG. 4 show the numerical analysis results on the flow of magnetic flux in the magnetic circuit formed by the solenoid unit by the present inventors. FIG. 3 is an explanatory diagram showing an example of the analysis result of the magnetic flux flowing through the solenoid unit 10 of the present embodiment, and FIG. 4 shows that one end surface 12Ba of the coil 12B and the inner wall surface 16Ba of the ring core 16B are not inclined. That is, it is explanatory drawing which shows an example of the analysis result of the magnetic flux which flows through the solenoid part 10B as a comparative example formed so as to be orthogonal to the axial direction. Note that the number of turns of the coils 12 and 12B of the solenoid parts 10 and 10B shown in FIGS. 3 and 4 is the same as the whole, and in FIGS. 3 and 4, the magnetic flux density becomes higher as the magnetic flux lines become denser. .

  Compared with the solenoid unit 10 of the present embodiment shown in FIG. 3, in the solenoid unit 10 </ b> B of the comparative example, as shown in FIG. 4, the magnetic flux lines are sparse at the outer periphery of the ring core 16 </ b> B on the coil 12 side. This is because magnetic flux does not easily flow from the cylindrical portion 151 to the outer peripheral portion of the ring core 16B due to the presence of a slight clearance between the cylindrical portion 151 of the case 15 and the ring core 16B. Conceivable. And since the magnetic flux density becomes small, the outer peripheral part of the ring core 16B in which the magnetic flux lines are sparse does not contribute much to the generation of the attractive force (driving force) that moves the plunger 13. On the other hand, at the bottom 152 of the case 15 of the solenoid part 10B, the part other than the outer peripheral part of the ring core 16B, and the magnetic flux transfer part A between the ring core 16B and the fixed core 11, as shown in FIG. These portions contribute greatly to the generation of a suction force (driving force) that moves the plunger 13.

  Accordingly, the axial length of the magnetic flux passing part A between the ring core 16 and the fixed core 11 is ensured, except for the bottom 152 of the case 15, the part other than the outer peripheral part of the ring core 16, that is, the outer peripheral part on the bottom 152 side of the ring core 16. As a result, the flow of magnetic flux in the entire solenoid unit 10 is not hindered. Based on this, in the solenoid unit 10 of the present embodiment, as described above, the one end surface 12a of the coil 12 and the inner wall surface 16a of the ring core 16 move toward the other end surface 12b side from the outer peripheral side toward the inner peripheral side. The ring core 16 is inclined so as to approach, and is formed such that the axial length becomes shorter from the inner peripheral side toward the outer peripheral side. Accordingly, the entire ring core 16 is brought closer to the other end surface 12b side of the coil 12, and the axial length of the magnetic flux transfer portion A on the one end surface 12a side of the coil 12 is sufficient, that is, the solenoid portion including the coil 12B described above. The axial length of the case 15 can be shortened while securing the same level as 10B (see the rough broken line in FIG. 2). Therefore, in the solenoid unit 10 of the present embodiment, the axial length can be shortened while ensuring the attractive force (driving force) for moving the plunger 13 so as not to decrease the density of the magnetic flux flowing through the entire magnetic circuit. It becomes possible to plan.

  FIG. 5 is an enlarged cross-sectional view showing a main part of a solenoid unit 10C according to another embodiment. As shown in the figure, the case 15C of the solenoid portion 10C corresponds to a case in which the ring core 16 is integrally formed with the case 15 of the solenoid portion 10, and an annular portion 153 including an inner wall surface 153a facing one end surface 12a of the coil 12. including. Like the one end surface 12a of the coil 12, the inner wall surface 152a of the annular portion 153 approaches the other end surface 12b of the coil 12 from the outer peripheral side toward the inner peripheral side, that is, along the end surface 12a of the coil 12. It is formed so as to be inclined. As described above, even if the annular portion 153 is integrally formed with the case 15, it is possible to shorten the axial length of the solenoid portion 10C while ensuring a good driving force for moving the plunger 13, and the solenoid portion 10C. In addition to reducing the number of parts, the assembly process can be reduced, and the manufacturing cost of the solenoid unit 10C can be reduced.

  FIG. 6 is an enlarged cross-sectional view illustrating a main part of a solenoid unit 10D according to still another embodiment. As shown in the figure, in the solenoid portion 10D, the end surface 12a of the coil 12 includes a horizontal portion 12h extending in parallel to the axial direction at a substantially central portion in the radial direction, and the inner wall surface 16a of the ring core 16 is connected to the horizontal portion 12h of the coil 12. It includes a horizontal portion 16h extending parallel to the axial direction so as to face each other. Thus, by forming the horizontal portions 12h and 16h on the end surface 12a of the coil 12 and the inner wall surface 16a of the ring core 16, the tip end portion A1 of the magnetic flux transfer portion A can be brought closer to the other end surface 12b of the coil 12. Therefore, it is possible to further shorten the axial length of the solenoid unit 10D. Note that the coil 12 of the solenoid unit 10D may be configured by aligning and winding a coated conductor on a bobbin, or may be configured by randomly winding a coated conductor on a bobbin.

  FIG. 7 is an enlarged cross-sectional view showing a main part of a solenoid unit 10E according to another embodiment. In the solenoid unit 10 </ b> E, the coil 12 is configured by randomly winding the coating wire 124 around the bobbin 122. Accordingly, the one end surface 12a of the coil 12 and the inner wall surface 16a of the ring core 16 formed along the one end surface 12a can be formed into a complicated shape such as a curved shape. Since the inner wall surface 16a of the ring core 16 formed along the one end surface 12a and the one end surface 12a can be formed into an arbitrary shape such as a relatively complicated curved surface as shown in FIG. In addition, the contact length between the ring core 16 (annular portion) and the fixed core 11, that is, the axial length of the magnetic flux transfer portion A, and the like are adjusted more appropriately to secure the magnetic flux flowing through the ring core 16 (annular portion) and the fixed core 11 better. It becomes possible to do.

  In the above-described solenoid parts 10, 10C to 10E, one end surface 12a of the coil 12 is inclined so as to approach the other end surface 12b from the outer peripheral side toward the inner peripheral side, but the other end surface 12b is also the same. Moreover, you may make it incline so that it may approach one end surface 12a as it goes to an inner peripheral side from an outer peripheral side. In this case, if the inner wall surface on the other end surface 12b side of the flange portion 113 of the fixed core 11 is formed to be inclined so as to approach one end surface 12a from the outer peripheral side toward the inner peripheral side, The inner peripheral part of the wall surface can be brought closer to the inner side in the axial direction (one end face 12a side). As a result, even if the entire flange portion 113 is moved inward in the axial direction, the axial length of the inner peripheral portion of the flange portion 113 where the magnetic flux does not easily flow can be secured because the peripheral length is short and the cross-sectional area is small. The axial length of the fixed core 11 can be shortened without hindering the flow. Thereby, the axial length of the solenoid part 10 can be further shortened, ensuring the driving force which moves the plunger 13. FIG.

  As described above, the electromagnetic drive device according to the present invention includes the cylindrical fixed core, the cylindrical coil disposed so as to surround the fixed core, and the fixed core so as to be movable in the axial direction. And a bottomed cylindrical case that accommodates the fixed core, the coil, and the plunger, and the axial direction of the plunger by the magnetic flux generated when the coil is energized. In the electromagnetic drive device to be moved, the case has an inner wall surface facing one end surface in the axial direction of the coil, and an annular portion into which one end of the fixed core is fitted, and the coil The one end surface of the coil is inclined so as to approach the other end surface of the coil from the outer peripheral side toward the inner peripheral side, and the annular wall portion of the case has the inner wall surface from the outer peripheral side. Characterized in that toward the periphery along with approaching the other end face of the coil is formed to be inclined along the end face of the one.

  The electromagnetic drive device according to the present invention has a cylindrical fixed core, a cylindrical coil arranged so as to surround the fixed core, and a plunger arranged inside the fixed core so as to be movable in the axial direction. Housed in a bottom cylindrical case. The case has an inner wall surface facing one end surface in the axial direction of the coil, and an annular portion into which one end of the fixed core is fitted. Then, one end surface of the coil is inclined so as to approach the other end surface of the coil from the outer peripheral side toward the inner peripheral side. Further, the annular portion of the case is formed so as to approach the other end surface of the coil and incline along one end surface as the inner wall surface moves from the outer peripheral side to the inner peripheral side.

  Thus, when one end face of the coil is inclined so as to approach the other end face as it goes from the outer peripheral side to the inner peripheral side, the number of turns on the inner peripheral side of the coil is reduced on the one end face side and the coil By increasing the number of turns on the outer peripheral side of the coil, it is possible to maintain the same number of turns as the coil having the end face that is formed orthogonal to the axial direction without reducing the number of turns of the entire coil. Thereby, in this electromagnetic drive device, the driving force for moving the plunger can be sufficiently secured. In addition, the inner wall surface of the annular portion of the case formed along one end surface of the coil is inclined so as to approach the other end surface of the coil as it goes from the outer peripheral side to the inner peripheral side. The other end surface side of the coil (the central portion side in the axial direction in the case) is the contact portion between the surface and the fixed core, that is, the coil side end of the magnetic flux transfer portion that transfers the magnetic flux from the annular portion to the fixed core. ). Thereby, the axial length of the case can be shortened while the entire annular portion is brought close to the other end surface side of the coil and the axial length of the magnetic flux transfer portion on the one end surface side of the coil is secured. Therefore, in this electromagnetic drive device, it is possible to shorten the shaft length while ensuring better driving force for moving the plunger.

  The annular portion may be an annular member that is formed separately from the case and is fitted into the case such that the inner wall surface faces the one end surface of the coil. As a result, since the fixed core can be easily fitted into the annular member using a slight backlash between the case and the annular member, the processing required for each of the case, the annular member, and the fixed core. The accuracy can be lowered.

  Further, the annular portion may be integrally formed with the case. As a result, the number of parts of the electromagnetic drive device can be reduced and the assembly process can be reduced to reduce the manufacturing cost of the electromagnetic drive device.

  In addition, the coil may be configured by winding a wire rod in an aligned manner so that the number of turns increases from the inner peripheral side toward the outer peripheral side. Thereby, the inclination angle of one end face of the coil can be easily and appropriately set by adjusting the increasing degree of the number of windings of the wire in the axial direction and the radial direction of the coil.

  Further, the coil may be configured by randomly winding a wire. Thereby, since one end surface of the coil and the inner wall surface of the annular portion formed along the one end surface can be formed into an arbitrary shape, the number of turns of the coil and the contact portion between the annular portion and the fixed core, It is possible to more appropriately secure the magnetic flux flowing through the annular portion and the fixed core by appropriately adjusting the axial length and the like of the magnetic flux transfer portion.

  Furthermore, an electromagnetic valve according to the present invention includes the electromagnetic driving device and a spool that moves in the axial direction in conjunction with the plunger. As described above, the electromagnetic drive device according to the present invention can shorten the shaft length while ensuring better driving force for moving the plunger. Therefore, even in the electromagnetic valve provided with the electromagnetic driving device, it is possible to shorten the shaft length while ensuring better driving force for moving the plunger.

  And this invention is not limited to the said embodiment at all, and it cannot be overemphasized that a various change can be made within the range of the extension of this invention. Furthermore, the mode for carrying out the invention described above is merely a specific embodiment of the invention described in the column for solving the problem, and is described in the column for means for solving the problem. It is not intended to limit the elements of the invention.

  The present invention can be used in the manufacturing industry of electromagnetic driving devices and electromagnetic valves.

  DESCRIPTION OF SYMBOLS 1 Solenoid valve 10,10B, 10C, 10D, 10E Solenoid part, 11 Fixed core, 111 1st cylindrical part, 111a Annular recessed part, 111o 1st center hole, 112 2nd cylindrical part, 112o 2nd center hole, 113 flange portion, 113o through hole, 12 coil, 12a, 12b end face, 12h horizontal portion, 121 resin insulation portion, 121a connector portion, 122 bobbin, 122f flange portion, 123 resin material, 124 coated conductor, 13 plunger, 14 shaft, 15, 15C case, 151 cylindrical part, 152 bottom part, 153 annular part, 153a inner wall surface, 16 ring core, 16a inner wall surface, 16h horizontal part, 20 valve part, 21 sleeve, 211 input port, 212 output port, 213 drain port 214 feedback port 215 216 discharge port, 22 spool, 221, 222, 223 land, 224 first reduced diameter portion, 225 second reduced diameter portion, 23 end plate, 24 spring.

Claims (6)

A cylindrical fixed core, a cylindrical coil arranged so as to surround the fixed core, a plunger arranged inside the fixed core so as to be movable in the axial direction, the fixed core, In an electromagnetic drive device that includes a coil and a bottomed cylindrical case that accommodates the plunger, and moves the plunger in the axial direction by a magnetic flux generated along with energization of the coil.
Wherein the case has an annular portion that have a inner wall surface facing the one end face in the axial direction of the coil,
The one end surface of the coil is inclined so as to approach the other end surface of the coil from the outer peripheral side toward the inner peripheral side,
The annular portion of the case has an axial length that decreases from the inner peripheral side toward the outer peripheral side , and approaches the other end surface of the coil as the inner wall surface moves from the outer peripheral side toward the inner peripheral side . It is formed to incline along the one end surface ,
Inside of the annular portion, one end of the fixed core are the fitted electromagnetic driving device according to claim Rukoto.   The annular portion is an annular member that is formed separately from the case and is fitted into the case so that the inner wall surface faces the one end surface of the coil. Item 2. The electromagnetic drive device according to Item 1.   The electromagnetic drive device according to claim 1, wherein the annular portion is integrally formed with the case.   The electromagnetic drive according to any one of claims 1 to 3, wherein the coil is configured by winding a wire rod in an aligned manner so that the number of turns increases from the inner circumference side toward the outer circumference side. apparatus.   The electromagnetic drive device according to any one of claims 1 to 3, wherein the coil is configured by randomly winding a wire. An electromagnetic valve comprising: the electromagnetic drive device according to any one of claims 1 to 5; and a spool that moves in an axial direction in conjunction with the plunger.

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