JP5351603B2 - Linear solenoid and valve device using the same - Google Patents

Description

  The present invention relates to a linear solenoid that exhibits an exciting action when energized and a valve device using the linear solenoid.

  Conventionally, a linear solenoid valve having a valve body that displaces a movable core by an excitation action of a solenoid and switches between a communication state and a non-communication state of an inlet port and an outlet port by transmitting the displacement of the movable core has been used. ing.

  With regard to this type of linear solenoid valve, the present applicant has proposed a linear solenoid valve that can further improve the suction force with respect to the movable core (see, for example, Patent Document 1).

  In the linear solenoid valve disclosed in Patent Document 1, both ends of the shaft passing through the center of the movable core are respectively formed by a first flat bearing and a second flat bearing formed of a sintered body containing a sintered metal. It is configured to support.

JP 2006-97723 A

  By the way, in the linear solenoid valve disclosed in Patent Document 1, since the shaft is fixed along the central hole that penetrates the movable core, for example, the outer diameter of the movable core is reduced to reduce the diameter. Then, there is a possibility that a saturation state of magnetic flux density occurs in the movable core. As a result, it becomes difficult to reduce the diameter of the movable core, and it becomes difficult to ultimately reduce the size of the solenoid.

  Further, in the linear solenoid valve disclosed in Patent Document 1, when the shaft is press-fitted along the central hole through which the movable core passes, the coaxiality between the axis of the movable core and the axis of the shaft is shifted, so that the movable There is a concern that the force (side force) for attracting the movable core in the radial direction toward the cylindrical yoke side increases between the outer peripheral surface of the core and the inner peripheral surface of the cylindrical yoke surrounding the movable core. Is done. As a result, it becomes difficult to improve the hysteresis characteristics of the solenoid.

  Furthermore, since both ends of the shaft that penetrates the movable core are supported by the first flat bearing and the second flat bearing, respectively, the solenoid is elongated along the axial direction of the shaft. As a result, it is difficult to reduce the size of the solenoid.

  The present invention has been made in view of the above points, and an object thereof is to provide a linear solenoid capable of reducing the size and improving the hysteresis characteristics, and a valve device using the linear solenoid. .

In order to achieve the above object, the present invention provides a coil, a columnar movable core that is attracted to a fixed core under an energizing action on the coil, and is disposed inside the coil. A linear solenoid part having a cylindrical yoke surrounding an outer peripheral surface of the movable core, the movable core is made of a shaftless, and the movable core is slid on both end sides along the axial direction of the cylindrical yoke. A plurality of bearings that are movably supported are provided, and the bearings are provided so as to protrude by a predetermined length from the inner peripheral surface of the cylindrical yoke toward the movable core side.

  According to the present invention, by adopting a shaftless structure in which the conventional shaft is not provided for the movable core, the magnetic flux density saturation of the movable core can be reduced as compared with the conventional structure in which the shaft is provided. . As a result, in the present invention, it is possible to reduce the diameter of the movable core and / or reduce the axial dimension, thereby reducing the size of the movable core. As a result, the entire linear solenoid can be reduced in size.

  Further, according to the present invention, since the plurality of bearings are respectively disposed on both end sides along the axial direction of the same cylindrical yoke, the coaxiality of the movable core with respect to the cylindrical yoke can be easily achieved. . By ensuring the coaxiality of the movable core with respect to the cylindrical yoke, it is possible to reduce the side force (the force for attracting the movable core in the radially outward direction) and obtain good hysteresis characteristics.

  Furthermore, according to the present invention, for example, by appropriately setting the protrusion amount (predetermined length) of the bearing protruding from the inner peripheral surface of the cylindrical yoke toward the movable core side, the inner peripheral surface of the cylindrical yoke is movable. A magnetic gap, which is a radial gap with the outer peripheral surface of the core, can be easily set with high accuracy. As a result, in the present invention, the magnetic gap can be set to a minimum and the attractive force with respect to the movable core can be improved.

  Further, the present invention is characterized in that annular recesses capable of inserting the bearings along the axial direction of the cylindrical yoke are provided on both end portions of the inner peripheral surface of the cylindrical yoke.

  According to the present invention, a plurality of bearings that support both ends of the movable core are inserted along the axial direction from both ends of the cylindrical yoke (including press-fitting), whereby both ends of the cylindrical yoke in the axial direction are inserted. The bearings can be easily attached to the annular recesses formed on the side portions, so that the assembling work is facilitated and the assembling property can be improved.

  Further, according to the present invention, the housing includes a housing bottom provided on one end side along the axial direction of the housing, a cylindrical projecting portion extending from the housing bottom, and an additional member extending from the cylindrical projecting portion. A circle made of a non-magnetic material that closes the opening on the one end side of the housing by being in contact with the cylindrical projecting portion and held by the caulking portion at one end portion of the housing. A plate-like member is provided.

  According to the present invention, a cylindrical protrusion is formed in the housing, and the disk-like member that closes the cylindrical protrusion is made of a nonmagnetic material, thereby simplifying the space in the housing in which the movable core is disposed. And the sticking of the movable core to the disk-shaped member can be prevented.

  Furthermore, the present invention is characterized in that the bearing supporting the one end of the movable core facing the housing bottom and / or the one end of the movable core is substantially orthogonal to the axis of the movable core, and the shaft of the housing bottom It is good to arrange | position to the straight line which passes along the center part of the thickness along a direction.

  According to the present invention, one end portion of the movable core facing the housing bottom side is arranged so as to intersect with a straight line that is substantially orthogonal to the axis of the movable core and passes through the central portion of the housing bottom, so that the outermost diameter side of the housing The magnetic flux flowing in from the bottom of the housing having a thick axial dimension toward the movable core compared to the radial thickness of the cylindrical portion provided in the cylindrical portion can be made favorable. As a result, in the present invention, the magnetic flux density generated by the exciting action of the linear solenoid can be increased, and the attractive force with respect to the movable core can be improved. In addition, arrangement | positioning in the shape of a cross means that the said movable core is arrange | positioned so that arbitrary parts by the side of the one end part of a movable core may cross | intersect a straight line.

  Further, according to the present invention, even when the bearing that supports the one end side of the movable core is arranged so as to intersect with a straight line that is substantially orthogonal to the axis of the movable core and passes through the central portion of the bottom of the housing, It can be avoided as much as possible that the magnetic flux flow is obstructed. As a result, in the present invention, it is possible to achieve both the miniaturization of the linear solenoid in which the axial dimension of the movable core is shortened and the attraction force of the movable core by increasing the generated magnetic flux density. In addition, the arrangement | positioning in crossing means that the said bearing is arrange | positioned so that arbitrary parts of a bearing may cross | intersect a straight line.

Further, the present invention is characterized in that the housing bottom portion is thinner than a length along the axial direction of the bearing that supports one end portion side of the movable core.
Still further, the present invention provides a valve body having a plurality of ports through which a pressure fluid flows, the linear solenoid according to any one of claims 1 to 6 , and a valve body, wherein the movable core displaces the movable body. And a valve mechanism having a valve body that switches between a communication state and a non-communication state between a plurality of ports.

  By configuring the valve device in this way, it is possible to provide a valve device having a linear solenoid that is downsized and has improved hysteresis characteristics, and can achieve a reduction in size and weight of the entire valve device. .

According to the present invention, it is possible to obtain a linear solenoid capable of reducing the size of the linear solenoid and improving the hysteresis characteristics.
Further, according to the present invention, it is possible to obtain a valve device including a linear solenoid that is downsized and has improved hysteresis characteristics.

It is a longitudinal cross-sectional view along the axial direction of the hydraulic control apparatus with which the linear solenoid which concerns on embodiment of this invention was integrated. FIG. 2 is an enlarged longitudinal sectional view of a linear solenoid part of the hydraulic control device shown in FIG. 1. (A) is a disassembled perspective view which shows the relationship between a spool, a nonmagnetic plate, and a movable core, (b) is an arrow view seen from the arrow Z direction of (a). (A)-(c) is explanatory drawing which shows the process in which a cap member is crimped with respect to the cylindrical protrusion part of a housing. (A)-(c) is explanatory drawing which shows the process in which a flat bearing etc. are assembled | attached with respect to a cylindrical yoke. FIG. 2 is a longitudinal sectional view showing a state in which the linear solenoid part is energized and the valve position of the spool is switched from the OFF state of the linear solenoid part shown in FIG. 1. It is explanatory drawing which shows the magnetic flux flow which generate | occur | produced in the solenoid part.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. 1 is a longitudinal sectional view along the axial direction of a hydraulic control apparatus incorporating a linear solenoid according to an embodiment of the present invention, and FIG. 2 is an enlarged longitudinal sectional view of a linear solenoid portion of the hydraulic control apparatus shown in FIG. It is.

  As shown in FIG. 1, a hydraulic control device (valve device) 10 includes, for example, a housing 14 that is formed of a magnetic metal material into a bottomed cylindrical shape, and in which a linear solenoid portion (linear solenoid) 12 is disposed. And a sleeve-like valve body 18 integrally connected to the housing 14 and provided with a valve mechanism 16 therein.

  As shown in FIGS. 1 and 2, the housing 14 has a cylindrical portion 14 a that is formed in a longest length along the axial direction and is provided on the radially inner side of the cylindrical portion 14 a. A cylindrical yoke 14b that is formed at a distance and extends substantially parallel to the cylindrical portion 14a and is formed in a short length, and is formed at one end portion (joining site) in the axial direction of the cylindrical portion 14a and the cylindrical yoke 14b. The housing bottom portion 14c is formed so that the thickness in the axial direction is thicker than the thickness in the radial direction of the cylindrical portion 14a.

  Further, the housing 14 holds the cylindrical projecting portion 14d that is continuous with the housing bottom portion 14c and extends substantially parallel to the cylindrical portion 14a, and a cap member 19 that is extended from the cylindrical projecting portion 14d and described later. And a thin caulking portion 14e. In this case, the cylindrical portion 14a, the cylindrical yoke 14b, the housing bottom portion 14c, the cylindrical protruding portion 14d, and the caulking portion 14e are integrally formed.

  As shown in FIG. 2, the cap member 19 is made of a disk-like member made of a nonmagnetic material, and a tapered surface 19 a that is held by a crimped portion 14 e of the housing 14 is formed on the outer peripheral surface. . In addition, an annular groove portion 19b is formed on the inner wall of the cap member 19 that faces the movable core 22 described later to communicate one flow path hole 30a and the other flow path hole 30b of the movable core 22 described later.

  In this case, as shown in FIG. 4, in a state where the cap member 19 is inserted along the caulking portion 14e of the housing 14 and the cap member 19 is brought into contact with the cylindrical protruding portion 14d, pressurization (not shown) is performed. The cylindrical protrusion 14d (housing 14) is closed by pressurizing the thin caulking portion 14e inward by means.

  In the present embodiment, a cylindrical projecting portion 14d is formed in the housing 14, and the disc-shaped cap member 19 that closes the cylindrical projecting portion 14d is made of a nonmagnetic material, whereby the movable core 22 is disposed. The space in 14 can be easily sealed, and sticking of the movable core 22 to the cap member 19 can be prevented.

  The cylindrical yoke 14b is, for example, a press-fit fitting (not shown) in which another yoke (not shown) made of a substantially cylindrical body formed separately from the housing 14 is formed on the inner peripheral surface of the housing bottom portion 14c. You may form so that it may press-fit to a part.

  As shown in FIGS. 1 and 2, the linear solenoid part 12 includes a coil assembly housed in a housing 14, and is integrally formed with the housing 14 on the closed end side of the housing 14. A cylindrical yoke 14b disposed in the interior of the solid body is coupled to the opening end of the cylindrical portion 14a, and is disposed along the axial direction inside the coil assembly with a predetermined clearance from the cylindrical yoke 14b. And a movable core 22 disposed so as to be displaceable inside the cylindrical yoke 14b.

  As shown in FIG. 2, one end portion of the fixed core 20 facing the movable core 22 with a predetermined spacing is provided with a tapered surface whose outer peripheral surface is gradually reduced in diameter, and the longitudinal section has an acute angle. An annular flange portion 20a formed and an annular step portion 20b that functions as a stopper that regulates the amount of displacement of the movable core 22 with a nonmagnetic plate 38 to be described later interposed therebetween are provided. The coil assembly includes a coil bobbin 24 formed of a resin material and having flanges at both ends along the axial direction, and a coil 26 wound around the coil bobbin 24.

  Between the housing 14 and the coil 26, a resin sealing body 28 in which the outer peripheral surface of the coil 26 is molded is provided. The resin sealing body 28 is a coupler (not shown) connected to the coil 26. It is integrally formed of a resin material including the part. The coupler portion is provided with a terminal terminal portion (not shown) that is electrically connected to the coil 26.

  The movable core 22 is formed of a shaftless cylindrical body that is not provided with a conventional shaft penetrating the central portion thereof, and the cylindrical body has a separation angle of about 180 degrees along the circumferential direction and in the axial direction. A plurality of flow path holes 30a and 30b penetrating along are provided. The flow holes 30a and 30b allow the pressure oil on one end side and the pressure oil on the other end side along the axial direction of the movable core 22 to flow.

  On the one end side along the axial direction of the movable core 22 is provided a first flat bearing 36a mounted (press-fitted) into an annular recess 32a formed on the inner peripheral surface of the cylindrical yoke 14b. The movable core 22 is slidably supported along the axial direction via the one flat bearing 36a. Further, on the other end side along the axial direction of the movable core 22, the second is mounted (press-fitted) into an annular recess 32 b formed on the inner peripheral surface of the cylindrical yoke 14 b close to the housing bottom 14 c. A flat bearing 36b is provided, and the movable core 22 is slidably supported along the axial direction via the second flat bearing 36b. The movable core 22 may be integrally formed including a shaft portion 40b of the spool 40 described later.

  In the longitudinal cross section shown in FIG. 2, the first flat bearing 36a and the second flat bearing 36b are constituted by the same annular body. The annular body has, for example, an outer diameter layer (back metal layer) formed of a metal material such as SPCC (JIS standard), and a resin layer (an inner diameter layer) that is thinner than the outer diameter layer. A laminated bearing may be used. This bearing is made of a sliding bearing having self-lubricating properties, and wear resistance can be improved by using such a sliding bearing having self-lubricating properties.

  The inner diameter surfaces of the first flat bearing 36a and the second flat bearing 36b that are in sliding contact with the outer peripheral surface of the movable core 22 are provided so as to protrude by a predetermined length T from the inner peripheral surface of the cylindrical yoke 14b in the radial direction ( (See FIG. 2). Therefore, the movable core 22 is in sliding contact with only the first flat bearing 36a and the second flat bearing 36b, and the protrusion amount (predetermined length) is provided between the inner peripheral surface of the cylindrical yoke 14b and the outer peripheral surface of the movable core 22. A radial gap 37 corresponding to T) is formed. The radial gap 37 functions as a magnetic gap in the radial direction between the movable core 22 and the cylindrical yoke 14b.

  It should be noted that the first flat bearing 36a and the second flat bearing 36b are adjacent to the first annular recess 32a and the second annular recess 32b of the cylindrical yoke 14b into which the first flat bearing 36a and the second flat bearing 36b are press-fitted. Is formed with a tapered surface 39 that functions as a guide surface when assembled to the cylindrical yoke 14b.

  Thus, it is set as the both-ends support structure which slidably supports the both ends of the movable core 22 via the 1st flat bearing 36a and the 2nd flat bearing 36b which are arrange | positioned at the same cylindrical yoke 14b. Can do. As a result, stable linearity of the movable core 22 and coaxiality between the cylindrical yoke 14b and the movable core 22 can be easily secured, and the hysteresis characteristics of the linear solenoid portion 12 can be improved. This will be described in detail later.

  In the present embodiment, the first flat bearing 36a and the second flat bearing 36b, which are formed separately from the cylindrical yoke 14b, are arranged on both end sides along the axial direction of the cylindrical yoke 14b. However, for example, an annular protrusion (not shown) that protrudes from the inner peripheral surface of the cylindrical yoke 14b toward the movable core 22 by a predetermined length T is formed integrally with the cylindrical yoke 14b. May be. In contrast to the above, an annular convex portion (not shown) that protrudes by a predetermined length T toward the cylindrical yoke 14 b side may be integrally formed on the outer peripheral surface of the movable core 22.

  The end surface of the movable core 22 facing the fixed core 20 is formed of a non-magnetic material, and when the energization to the coil 26 is stopped, the movable core 22 remains attracted to the fixed core 20 due to the influence of residual magnetism. A nonmagnetic plate 38 having a function to prevent this (sticking prevention function) is provided so as to abut. As shown in FIG. 3, the nonmagnetic plate 38 is formed with a plurality of windows 42 that communicate with the flow passage holes 30 a and 30 b of the movable core 22. The nonmagnetic plate 38 is pivotally attached to an end edge portion of a shaft portion 40b of the spool 40 which will be described later, and is provided so as to be displaced integrally with the spool 40.

  In this case, an exciting action is generated by turning on a power source (not shown) and causing a current to flow through the coil 26, and the movable core 22 is integrally displaced toward the fixed core 20 by the exciting action, so that a spool described later. 40 can be operated (advanced / retracted).

  Returning to FIG. 1, the valve mechanism 16 abuts the valve body 18 provided with an inlet port 44, an outlet port 46, and drain ports 48 and 50, and the end surface of the movable core 22 of the linear solenoid unit 12, thereby moving the movable body 22. It includes a spool (valve element) 40 slidably disposed along the space inside the valve body 18 by being pressed by the core 22.

  In addition, the drain port 50 introduces / leads out the pressure oil in the housing 14 corresponding to the advance / retreat operation of the movable core 22. The inlet port 44, outlet port 46, and drain port 48 function as a plurality of ports through which pressure fluid flows.

  The spool 40 has a valve main body, and the valve main body is inserted into a land portion 40a having a plurality of lands bulging outward in a radial direction and a through hole of the fixed core 20 so as to be freely advanced and retracted. The shaft portion 40b is in contact with the end surface of the movable core 22 at one end portion. A nonmagnetic plate 38 is fixed to the end edge portion of the shaft portion 40b of the spool 40 that contacts the end surface of the movable core 22.

  In addition, an annular recess 52 that allows the inlet port 44 and the outlet port 46 to communicate with each other or the outlet port 46 and the drain port 48 to communicate with each other on the outer peripheral surface of the spool 40 in accordance with the displacement position of the spool 40. Is formed.

  Further, as shown in FIG. 1, the valve mechanism portion 16 is disposed so as to face the end surface of the spool 40, and includes a closing member 54 that closes the space portion of the valve body 18, and the spool 40 and the closing member 54. And a return spring 56 that is interposed therebetween and returns the spool 40 to the original position. A sealing ring 58 is provided on the outer peripheral surface of the closing member 54 to hold the mounting portion liquid-tight or air-tight through an annular groove.

  For example, the inlet port 44 is connected to an unillustrated hydraulic source (pressure fluid supply source) such as a hydraulic pump via a supply oil passage, and the outlet port 46 is connected to an unillustrated hydraulic device via an output oil passage. The drain port 48 is connected to a reservoir tank (not shown). In the present embodiment, the pressure oil is used for explanation. However, the present invention is not limited to this, and for example, a pressure fluid including compressed air or the like can be used as the working medium.

  The hydraulic control apparatus 10 according to the present embodiment is basically configured as described above. Next, the operation and effects thereof will be described.

  First, the assembly work of the first flat bearing 36a and the second flat bearing 36b with respect to the cylindrical yoke 14b of the housing 14 will be described with reference to FIG.

  A first flat bearing 36a and a second flat bearing 36b are respectively disposed on both end portions along the axial direction of the cylindrical yoke 14b (see FIG. 5A), and the first flat bearing 39 is a guide surface along the tapered surface 39. After the flat bearing 36a and the second flat bearing 36b are slid, the first annular recess 32a and the second annular recess 32b formed to be slightly smaller in diameter than the maximum outer diameters of the first flat bearing 36a and the second flat bearing 36b. The first flat bearing 36a and the second flat bearing 36b are pressed against the inner diameter surface in the lateral direction in the figure and are press-fitted (see FIG. 5B). After the first flat bearing 36a and the second flat bearing 36b are press-fitted, the movable core 22 is inserted into a space in the first flat bearing 36a and the second flat bearing 36b formed in a ring shape (FIG. 5C). )reference).

  As described above, in the present embodiment, the first flat bearing 36a and the second flat bearing 36b are press-fitted in the axial direction from both ends of the cylindrical yoke 14b, respectively, so that both ends of the cylindrical yoke 14b in the axial direction are pressed. The first flat bearing 36a and the second flat bearing 36b can be simply attached to the first annular recess 32a and the second annular recess 32b formed on the part side, and the assembling work becomes easy and the assembling property is improved. Can be improved.

  As shown in FIG. 4, the opening on the cylindrical protruding portion 14d side of the housing 14 is a caulking formed thinly in a state where the disk-shaped cap member 19 is in contact with the cylindrical protruding portion 14d. By pressurizing and caulking the portion 14e inward, the opening on the cylindrical protruding portion 14d side can be easily closed.

Next, the operation of the hydraulic control device 10 will be described.
When the linear solenoid portion 12 is not energized, as shown in FIG. 1, no electromagnetic force (electromagnetic thrust) of the linear solenoid portion 12 is generated. Therefore, the spool 40 is driven by the spring force of the return spring 56. It is in the state pressed toward the side.

  Therefore, in the OFF state of the linear solenoid portion 12, as shown in FIG. 1, the inlet port 44 and the outlet port 46 are in communication with each other by the annular recess 52 formed on the outer peripheral surface of the spool 40 (FIG. 1). ), The pressure oil introduced from the inlet port 44 is supplied to other members (not shown) via the annular recess 52 and the outlet port 46.

  Thus, in the OFF state of the linear solenoid part 12, the movable core 22 is in its original position without any displacement, and is in a normally open state in which the inlet port 44 and the outlet port 46 communicate with each other.

  Next, a current is supplied to the linear solenoid unit 12 by a power source (not shown), so that the linear solenoid unit 12 is turned on. In this ON state, as shown in FIG. 6, the movable core 22 slides along the first flat bearing 36 a and the second flat bearing 36 b by the electromagnetic force proportional to the current value flowing through the coil 26, and the fixed core 20. The movable core 22 stops at a displacement end position where the movable core 22 contacts the annular step 20b of the fixed core 20.

  That is, the displacement of the movable core 22 due to the exciting action of the linear solenoid portion 12 is transmitted to the spool 40, and the spool 40 is displaced in the direction approaching the closing member 54 side against the spring force of the return spring 56.

  Therefore, as shown in FIG. 6, the communication state between the inlet port 44 and the outlet port 46 is blocked by the land of the spool 40, and the outlet port 46 and the drain are separated by the annular recess 52 formed on the outer peripheral surface of the spool 40. The valve position is switched so that the port 48 is in communication.

  As a result, the outlet port 46 is in communication with the drain port 48 via an annular recess 52 formed on the outer peripheral surface of the spool 40 (see the thick arrow in FIG. 6), and the pressure oil remaining in the outlet port 46 is It is preferably discharged from the drain port 48.

  In the present embodiment, by adopting a shaftless structure in which the conventional shaft is not provided with respect to the movable core 22, it is possible to reduce the magnetic flux density saturation of the movable core 22 compared to the conventional structure in which the shaft is provided. it can. As a result, in the present embodiment, the movable core 22 can be reduced in diameter and / or shortened in the axial direction, and the movable core 22 can be reduced in size. As a result, the entire linear solenoid portion 12 can be reduced in size.

  In the present embodiment, since the first flat bearing 36a and the second flat bearing 36b are respectively disposed on both end sides along the axial direction of the same cylindrical yoke 14b, the movable core 22 with respect to the cylindrical yoke 14b. Coaxiality can be easily achieved. By ensuring the coaxiality of the movable core 22 with respect to the cylindrical yoke 14b, it is possible to reduce the side force (the force for attracting the movable core 22 in the radially outward direction) and obtain good hysteresis characteristics.

  Furthermore, in this embodiment, the magnetic gap which is the gap 37 in the radial direction between the cylindrical yoke 14b and the movable core 22 can be set easily and with high accuracy. For example, the depths of the first annular recess 32a and the second annular recess 32b into which the first flat bearing 36a and the second flat bearing 36b are press-fitted are appropriately set, or the first flat bearing 36a and the second flat bearing 36b. By appropriately setting the thickness dimension, the inner diameter surfaces of the first flat bearing 36a and the second flat bearing 36b protrude from the inner peripheral surface of the cylindrical yoke 14b in the radial direction (predetermined length T). ) Can be set easily. As a result, in this embodiment, the magnetic gap can be set to a minimum and the attractive force with respect to the movable core 22 can be improved.

  Moreover, in the present embodiment, as described above, by ensuring the coaxiality of the movable core 22 with respect to the cylindrical yoke 14b, it is possible to increase the attractive force with respect to the movable core 22 and to improve the hysteresis characteristics. Furthermore, in this embodiment, the movable core 22 is configured to partially slide only with the first flat bearing 36a and the second flat bearing 36b, thereby significantly reducing the sliding resistance and further improving the hysteresis characteristics. Can be made.

  Furthermore, in this embodiment, as shown in FIG. 2, one end portion of the movable core 22 facing the housing bottom portion 14c is substantially perpendicular to the axis of the movable core 22 and the central portion (in the axial direction) of the housing bottom portion 14c. The central portion of the cylindrical portion 14a provided on the outermost diameter side of the housing 14 is arranged in an intersecting manner with an alternate long and short dash line (straight line) A that passes through the central portion of the cylindrical portion 14a. The magnetic flux flow B flowing toward the movable core 22 from the side of the housing bottom portion 14c having a thick directional dimension can be improved. As a result, in this embodiment, the magnetic flux density generated by the excitation action of the linear solenoid unit 12 can be increased, and the attractive force with respect to the movable core 22 can be improved. In addition, the arrangement in an intersecting manner means that the movable core 22 is arranged such that an arbitrary part on one end side of the movable core 22 intersects with the alternate long and short dash line A.

  Furthermore, in the present embodiment, as shown in FIG. 2, the second flat bearing 36b is arranged so as to be substantially perpendicular to the axis of the movable core 22 and to the central portion of the housing bottom portion 14c (thick central portion along the axial direction). ) Are arranged so as to intersect with an alternate long and short dash line (straight line) A. In this case, as shown in FIG. 7, a part of the magnetic flux flow B generated by the excitation action passes through the outer diameter layer (back metal layer) of the second flat bearing 36b, and the second flat bearing 36b moves to the magnetic flux flow. B can be avoided as much as possible. As a result, in the present embodiment, it is possible to achieve both the miniaturization of the linear solenoid portion 12 in which the axial dimension of the movable core 22 is shortened and the improvement in the attractive force of the movable core 22 due to the increase in the generated magnetic flux density. In addition, the arrangement in an intersecting manner means that the second flat bearing 36b is arranged so that an arbitrary part of the second flat bearing 36b intersects with the alternate long and short dash line A.

  In the present embodiment, the movable core 22 is slidably supported by two bearings including the first flat bearing 36a and the second flat bearing 36b. However, the present invention is not limited to this, and the movable core 22 is movable. The core 22 may be configured to be supported by two or more bearings.

10 Hydraulic control device 12 Linear solenoid part (linear solenoid)
14 Housing 14b Cylindrical yoke 16 Valve mechanism 18 Valve body 19 Cap member (disk-shaped member)
20 fixed core 22 movable core 26 coil 32a, 32b annular recess 36a, 36b flat bearing 40 spool (valve element)
44 Inlet port 46 Outlet port

Claims (7)

A coil provided in the housing, a columnar movable core that is attracted to the fixed core under an energizing action on the coil, and a cylindrical yoke that is disposed inside the coil and surrounds an outer peripheral surface of the movable core. A linear solenoid part having
The movable core is shaftless, and a plurality of bearings are provided on both end sides along the axial direction of the cylindrical yoke so as to support the movable core in a slidable manner. A linear solenoid characterized in that the linear solenoid protrudes from the inner peripheral surface toward the movable core side by a predetermined length. The linear solenoid according to claim 1,
A linear solenoid characterized in that annular recesses into which the bearings can be inserted along the axial direction of the cylindrical yoke are provided on both ends of the inner peripheral surface of the cylindrical yoke. The linear solenoid according to claim 1 or 2,
The housing includes a housing bottom portion provided on one end side along the axial direction of the housing, a cylindrical projecting portion extending from the housing bottom portion, and a crimping portion extending from the cylindrical projecting portion,
A disc-shaped member made of a nonmagnetic material is provided at one end of the housing so as to close the opening on the one end side of the housing by being in contact with the cylindrical protrusion and being held by the caulking portion. A linear solenoid characterized by that. The linear solenoid according to claim 1 or 2,
One end portion of the movable core facing the housing bottom side is arranged to intersect with a straight line passing through a central portion of the thickness along the axial direction of the housing bottom portion substantially orthogonal to the axis of the movable core. Linear solenoid. The linear solenoid according to claim 4,
The bearing that supports one end side of the movable core is arranged to intersect with a straight line that passes through a central portion of the thickness along the axial direction of the bottom of the housing substantially perpendicular to the axis of the movable core. Linear solenoid. The linear solenoid according to claim 5, wherein the housing bottom portion is thinner than a length along an axial direction of the bearing that supports one end portion side of the movable core. A valve body having a plurality of ports through which the pressure fluid flows;
The linear solenoid according to any one of claims 1 to 6 ,
A valve mechanism provided in the valve body, and having a valve body that switches between a communication state and a non-communication state between the plurality of ports by displacement of the movable core;
A valve device comprising:

Images