Solenoid device

Abstract

Provided is a solenoid device that can keep a bearing from slipping toward the interior of the device.　A solenoid device 1 comprises a coil 2, a body 3, a mobile iron core 4 that is provided in an accommodation space S2 that is formed on an inner radial side of the body 3, a shaft 5 that moves with the mobile iron core 4, and a bearing 9 that extends from the accommodation space S2 side toward a device interior side S1 and guides the movement of the shaft 5. The accommodation space S2 and the device interior side S1 are in fluid communication. A retention mechanism 31a restricts movement of the bearing 9 from the accommodation space S2 side toward the device interior side S1.

Description

Solenoid Device

[0001] The present invention relates to a solenoid device, for example, a solenoid device that operates various devices using a movable iron core.

[0002] Solenoid devices are used in a variety of industrial fields as a means for operating various devices such as valves and machines. A solenoid device operates various devices by electromagnetically moving a movable iron core that is arranged so as to be able to reciprocate when current is passed through a coil.

[0003] The solenoid device disclosed in Patent Document 1 includes a solenoid body having a coil, a plunger, a center post, a sleeve, a cap, a rod, and a bearing. The solenoid body is hollow. An accommodating section for accommodating the plunger is formed on the inner diameter side of the solenoid body by the center post, sleeve, and cap. A rod is connected to the plunger. A bearing is disposed in a through-hole that penetrates the center post in the axial direction. The rod is inserted into this bearing. As a result, the rod, which moves axially together with the plunger, is guided by the bearing and is less likely to tilt, and the stroke amount of the rod relative to the amount of current flowing through the solenoid body can be stabilized.

[0004] Japanese Patent Application Laid-Open No. 9-89145 (pages 4 and 5, Figure 1)

[0005] In a solenoid device such as that described in Patent Document 1, a passage is formed in the rod that penetrates in the axial direction, allowing the actuated fluid to flow between the housing and the interior space of the device to be actuated. Also, a hole is formed in the plunger that penetrates in the axial direction, connecting the space in the housing closer to the center post than the plunger with the space on the cap side. This reduces resistance that occurs when moving the plunger and rod, making it easier to move the plunger and rod smoothly.

[0006] However, in a solenoid device such as that described in Patent Document 1, a pressure difference may occur between the housing and the interior of the machine. In particular, if the fluid pressure in the housing becomes relatively higher than the fluid pressure on the interior of the machine, there is a risk that the bearing may move to the interior of the machine and come loose.

[0007] The present invention has been made in view of the above-mentioned problems, and has as its object to provide a solenoid device that can prevent the bearing from slipping out to the inside of the machine.

[0008] In order to solve the above problems, the solenoid device of the present invention is a solenoid device comprising: a coil, a body, a movable core disposed in a housing formed on the inner diameter side of the body, a shaft that moves together with the movable core, and a bearing that extends from the housing side to the interior side and guides the movement of the shaft, the housing and the interior side being fluidly connected to each other, and further comprising a retaining mechanism that restricts movement of the bearing from the housing side to the interior side. This makes it possible to prevent the bearing from coming off to the interior side even if a pressure difference occurs between the housing side and the interior side.

[0009] The retaining mechanism may be a protrusion that protrudes toward the inner diameter side on the inside of the body, which makes it possible to easily configure the retaining mechanism.

[0010] The protrusion may be disposed between the inside side of the machine and the bearing, thereby preventing the bearing from coming off the inside side of the machine with a simpler configuration.

[0011] The protrusion may be annular, which can more reliably prevent the bearing from slipping out toward the inside of the machine and also increase the structural strength of the protrusion.

[0012] The retaining mechanism may be a flange of the bearing, which makes it possible to easily configure the retaining mechanism.

[0013] The body may have a cylindrical fixed core with a bottom and a holding member for holding the bearing, which allows the bearing to be easily disposed.

[0014] The fixed core may have an integral structure capable of accommodating the movable core, which simplifies assembly since the body can be assembled simply by attaching the holding portion to the fixed core.

[0015] 1A is a cross-sectional view of a solenoid device according to a first embodiment of the present invention, (a) is a cross-sectional view of a first modified example of the retaining mechanism, (b) is a cross-sectional view of a second modified example of the retaining mechanism, (c) is a cross-sectional view of a third modified example of the retaining mechanism, (d) is a cross-sectional view of a fourth modified example of the retaining mechanism, and (e) is a cross-sectional view of a fifth modified example of the retaining mechanism.

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A solenoid device according to the present invention will be described below with reference to an embodiment.

[0017] A solenoid device according to a first embodiment will be described with reference to Figures 1 and 2. In the following description, the left and right sides of Figure 1 will be taken as the left and right sides of the solenoid device.

[0018] As shown in FIG. 1, the solenoid device 1 is a solenoid mainly composed of a coil 2, a body 3, a movable iron core 4, a shaft 5, a solenoid case 106, a plate 7, two bearings 8 and 9, and a cap 10.

[0019] The coil 2 is mainly composed of an annular bobbin 20 made of an insulating material and a conductor 21 wound a predetermined number of times around the outer periphery of the bobbin 20. The conductor 21 is connected to a lead wire 22. When power is supplied from a power source (not shown) through the lead wire 22, the coil 2 generates a magnetic flux.

[0020] The coil 2 is fitted onto the small diameter peripheral wall 34 of the body 3. In other words, a part of the body 3 is located on the inner diameter side of the coil 2. The coil 2 is also sandwiched and fixed in the axial direction between the annular side wall 33 of the body 3 and the plate 7.

[0021] The body 3 includes a stepped cylindrical fixed core 30 made of a magnetic material such as iron and having a bottom, and a stepped cylindrical holding member 31 made of a magnetic material.

[0022] The fixed core 30 has an integral structure having, in order from the left in the axial direction, a large diameter peripheral wall 32, an annular side wall 33, a small diameter peripheral wall 34, and a side wall 35.

[0023] The large diameter peripheral wall 32 has a cylindrical shape that extends in the axial direction.

[0024] The annular side wall 33 extends radially inward from the axial right end of the large-diameter peripheral wall 32. At the intersection of the annular side wall 33 and the small-diameter peripheral wall 34, an annular step 33a is formed. The step 33a is recessed axially rightward from the axial left end face of the annular side wall 33 and is open axially leftward and radially inward.

[0025] The surface to the right of the annular step portion 33 a is an inner peripheral surface 34 a of the small diameter peripheral wall 34 .

[0026] The small diameter peripheral wall 34 is cylindrical with an outer step and extends axially from the inner diameter end of the annular side wall 33 .

[0027] The inner peripheral surface 34a of the small diameter peripheral wall 34 extends linearly in the axial direction. The inner peripheral surface 34a also extends substantially parallel to the axis of the small diameter peripheral wall 34. In other words, the inner diameter of the small diameter peripheral wall 34 is substantially constant along the axial direction.

[0028] An annular recess 36 that is trapezoidal in cross section is formed to the left of the axial center of the small diameter peripheral wall 34. The annular recess 36 is recessed from the outer circumferential surface of the small diameter peripheral wall 34 toward the inner diameter side and is open toward the outer diameter side.

[0029] In the small diameter peripheral wall 34, the radial dimension, i.e., the thickness, of the portions on both sides of the annular recess 36 in the axial direction is substantially constant.

[0030] The small diameter peripheral wall 34 has the thinnest wall thickness at the portion located at the innermost recessed portion of the annular recess 36. This thinnest portion is referred to as a thin-walled portion 34b.

[0031] The thin-walled portion 34b is cylindrical and has a substantially uniform thickness in the circumferential direction. The thin-walled portion 34b is the thinnest part of the small-diameter peripheral wall 34, and has the highest magnetic resistance in the small-diameter peripheral wall 34.

[0032] In the following description, the portion of the small diameter peripheral wall 34 to the axial left of the thin portion 34b will be referred to as a first peripheral wall portion 37, and the portion to the axial right of the thin portion 34b will be referred to as a second peripheral wall portion 38.

[0033] The side wall 35 is continuous with the right end of the small diameter peripheral wall 34 in the axial direction, and closes the right end of the small diameter peripheral wall 34 in the axial direction.

[0034] A stepped recess 35a that is recessed axially rightward from the axial left end face of the side wall 35 and that is open axially toward the left is formed in the center of the inner diameter side of the side wall 35. The axis of the stepped recess 35a substantially coincides with the axis of the small diameter peripheral wall 34.

[0035] The stepped recess 35a has an enlarged diameter at its left axial portion, and the bearing 8 is fitted and fixed in this enlarged diameter portion.

[0036] The holding member 31 has a cylindrical base 31a. An annular flange 31b that protrudes outward is formed on the outer diameter side of the left end of the base 31a in the axial direction. The axis of the flange 31b is substantially aligned with the axis of the base 31a.

[0037] A protrusion 31c is formed on the inner diameter side of the left axial end of the base 31a as a retaining mechanism. The protrusion 31c is formed in a ring shape and protrudes toward the inner diameter side from the left axial end of the base 31a. In other words, the protrusion 31c protrudes toward the inner diameter side. A through-hole 31d is formed in the radial center of the protrusion 31c, penetrating it in the axial direction.

[0038] A recess 31e is formed in the base 31a to the right of the protrusion 31c. The recess 31e is recessed axially leftward from the axial right end face of the base 31a and is open axially rightward. A bearing 9 is fitted and fixed in the recess 31e.

[0039] The through hole 31d communicates with the recess 31e. The inner diameter of the through hole 31d is smaller than the inner diameter of the recess 31e and slightly larger than the outer diameter of the shaft body 5. The axial centers of the through hole 31d and the recess 31e substantially coincide with the axial center of the base 31a.

[0040] The retaining member 31 is fitted and fixed to the inside of the annular side wall 33 of the fixed core 30. More specifically, the base 31a of the retaining member 31 is inserted into the small diameter peripheral wall 34 of the fixed core 30. The flange 31b of the retaining member 31 is fitted and fixed to the inside of the annular step 33a of the fixed core 30. The flange 31b may be fixed to the fixed core 30 by any appropriate method such as welding, bonding, or crimping. The same applies to the method of fixing the movable core 4 and the shaft 5.

[0041] With the retaining member 31 fixed to the fixed core 30, the axial centers of the bearings 8 and 9 substantially coincide with the axial center of the small diameter peripheral wall 34. In other words, simply by fixing the retaining member 31 to the fixed core 30, the axial centers of the bearings 8 and 9 can be substantially aligned, making assembly easy.

[0042] The space surrounded by the large-diameter peripheral wall 32 of the fixed core 30, the annular side wall 33, and the retaining member 31 is the interior space S1. The interior space S1 is a space on the actuation side where the valve body and the like are arranged, and through which the actuated fluid F flows. In other words, the protrusion 31c is arranged between the bearing 9 and the interior space S1.

[0043] The space surrounded by the small diameter peripheral wall 34, the side wall 35, and the holding member 31 of the fixed core 30 is an accommodation section S2 in which the movable core 4 is accommodated.

[0044] The movable core 4 is formed into a cylindrical shape from a magnetic material such as iron. The outer diameter of the movable core 4 is substantially constant along the axial direction. The movable core 4 has a diameter slightly smaller than the inner diameter of the small diameter peripheral wall 34 of the fixed core 30, and is disposed in a housing portion S2 formed on the inner diameter side of the body 3. The movable core 4 is capable of reciprocating in the axial direction within the housing portion S2.

[0045] A shaft 5 is inserted into and fixed to the radial center of the movable core 4. A communication hole 40 is formed in the movable core 4 on the outer diameter side of the shaft 5, penetrating the movable core 4 in the axial direction.

[0046] The movable core 4 is pressed away from the holding member 31, i.e., to the right in the axial direction, by a biasing means (not shown). The biasing means can be disposed between the movable core 4 and the holding member 31 or inside the machine interior S1. The biasing means can be a disc spring, a compression spring, a bellows, or the like.

[0047] The shaft body 5 is formed into a cylindrical shape and is made of a non-magnetic material such as an aluminum alloy. A communication hole 50 is formed in the radial center of the shaft body 5, penetrating in the axial direction.

[0048] The right side of the shaft body 5 is inserted into the bearing 8, and the left side is inserted into the bearing 9 and the through-hole 31d of the holding member 31. The shaft body 5 is slidable relative to the bearings 8 and 9.

[0049] The communication hole 50 in the shaft 5 communicates with the interior space S1 in the body 3 and with the stepped recess 35a. The stepped recess 35a communicates with the accommodation space S2 through the gap between the bearing 8 and the side wall 35, the gap between the bearing 8 and the shaft 5, etc. In other words, the interior space S1 and the accommodation space S2 are fluidly connected, and the worked fluid F can also flow through the accommodation space S2.

[0050] The fixed core 30 is cylindrical and has a bottom that opens to the inside of the machine, and is fixed to the actuator in a sealed manner. In this state, the housing S2 is not in communication with the space S3 outside the machine. In this embodiment, the space S3 outside the machine is a space outside the solenoid device 1 and the actuator, and the atmosphere A flows through it.

[0051] The solenoid case 6 is cylindrical and made of a magnetic material such as iron. The solenoid case 6 is fitted onto the large diameter peripheral wall 32 and plate 7 of the body 3 and fixed thereto. A packing seal is provided between the solenoid case 6 and the large diameter peripheral wall 32. The solenoid case may be part of the device to which it is attached (not shown), or may be attached and fixed to the device to which it is attached.

[0052] The plate 7 is formed in an annular plate shape from a magnetic material such as iron, and is fitted onto and fixed to the small diameter peripheral wall 34 of the body 3.

[0053] The cap 10 is formed from an insulating material into a cylindrical shape with a bottom. The cap 10 is fitted onto the small diameter peripheral wall 34 and is fixedly fitted into the right end of the solenoid case 6 in the axial direction. The gap between the solenoid case 6 and the cap 10 is sealed with a packing.

[0054] Next, the operation of the solenoid device 1 will be described.

[0055] First, a description will be given of the state when no current is applied to the coil 2. In this state, the movable core 4 is stationary at a position furthest from the holding member 31.

[0056] When current begins to flow through the coil 2, a magnetic flux is generated. In the solenoid device 1, a magnetic path is formed by the magnetic flux generated in the coil 2. In more detail, this magnetic path is mainly formed by the annular side wall 33 of the body 3, the solenoid case 6, the plate 7, the second peripheral wall portion 38 of the small diameter peripheral wall 34 of the body 3, the movable iron core 4, and the first peripheral wall portion 37 of the small diameter peripheral wall 34.

[0057] As described above, the thin portion 34 b has a high magnetic resistance, and therefore the magnetic flux is easily transmitted from the first circumferential wall portion 37 of the body 3 to the movable core 4 .

[0058] The left end of the second circumferential wall portion 38 of the body 3 has a tapered shape in which the thickness increases toward the right in the axial direction. In other words, the magnetic resistance decreases toward the right in the axial direction.

[0059] When not energized or immediately after energization, the left axial end of the movable core 4 is located on the inner diameter side of the right end of the tapered portion of the first circumferential wall portion 37. In other words, it is located on the inner diameter side of the portion of the second circumferential wall portion 38 where the magnetic resistance is high. As a result, the magnetic flux transmitted from the movable core 4 to the first circumferential wall portion 37 flows in a direction inclined to the left in the axial direction, generating an attractive force that attracts the movable core 4 to the left axial direction, i.e., toward the holding member 31.

[0060] When the attractive force exceeds the biasing force of the biasing means, the movable iron core 4 moves toward the holding member 31 .

[0061] The shaft body 5 moves integrally with the movable iron core 4. At this time, the shaft body 5 moves along the axis of the small diameter peripheral wall 34 while being guided by the bearings 8 and 9. Accordingly, the movable iron core 4 also moves along the axis of the small diameter peripheral wall 34.

[0062] The resistance that occurs when the movable core 4 and the shaft body 5 move is reduced by the communication hole 40 or the communication hole 50 even in the machine interior S1 or the storage section S2 into which the working fluid F flows.

[0063] The movable iron core 4 stops at a position where the attractive force and the biasing force of the biasing means are balanced or when it comes into contact with a stopper (not shown).

[0064] Furthermore, as the movable core 4 approaches the holding member 31, the magnetic flux transmitted from the movable core 4 to the first circumferential wall portion 37 flows more in a substantially radial direction without inclining to the left in the axial direction.

[0065] On the other hand, when the movable core 4 approaches the holding member 31, magnetic flux is also transmitted from the movable core 4 to the holding member 31. The direction in which the magnetic flux is transmitted from the movable core 4 to the holding member 31 is approximately the same as the direction in which the movable core 4 is attracted. This makes it easier to obtain an attractive force that attracts the movable core 4 closer to the holding member 31.

[0066] When the amount of current flowing through the coil 2 is reduced or stopped, the movable iron core 4 moves axially to the right due to the biasing force of a biasing means (not shown).

[0067] Next, prevention of the bearing 9 from coming out will be described. For example, if the operating device is a pilot valve provided in a damper or the like, the accommodation section S2 is constantly in communication with the space where pilot pressure is generated through the communication hole 50 in the shaft body 5. In other words, the fluid pressure in the accommodation section S2 is substantially the same as the pilot pressure. The pilot pressure tends to increase as the opening of the pilot valve narrows. The pilot pressure can reach its maximum when the pilot valve is closed.

[0068] The pilot valve is provided between the space where the pilot pressure is generated and the interior space S1. When the pilot valve is closed, the interior space S1 is not in communication with the space where the pilot pressure is generated, but is always in communication with the return passage to the damper side. In other words, the fluid pressure in the interior space S1 can be minimized.

[0069] When the fluid pressure in the housing S2 becomes higher than the fluid pressure in the interior S1, the force acting toward the left in the axial direction, which is the direction of removal, becomes greater on the bearing 9. The greater this force acting toward the left in the axial direction, the more easily the bearing 9 moves toward the left in the axial direction.

[0070] In this embodiment, a protrusion 31c is formed axially to the left of the bearing 9. As a result, even if the bearing 9 attempts to move axially to the left, the movement is restricted by contact with the protrusion 31c. In other words, the bearing 9 is prevented from slipping out of the accommodation section S2 into the interior S1 of the machine.

[0071] As described above, the retaining mechanism of this embodiment is the convex portion 31c that protrudes toward the inner diameter side and is provided closer to the housing portion S2 than the bearing 9. This makes it possible to easily configure the retaining mechanism.

[0072] Furthermore, because the convex portion 31c is located between the interior S1 side of the aircraft and the bearing 9, even in the case of a cylindrical bearing 9 that does not have a flange 109b, such as in Modifications 1 to 3 shown in Figure 2(a) described below, simply placing the bearing 9 in the concave portion 31e can prevent the bearing 9 from coming off toward the interior of the aircraft with a simpler configuration than Modifications 2 and 3, which differ not only in the shape of the bearing but also in the shape of the retaining member.

[0073] Furthermore, because the protrusion 31c is annular, the bearing 9 that comes into contact with the protrusion 31c is less likely to tilt. This allows the protrusion 31c to reliably prevent the bearing 9 from slipping out into the interior S1 of the machine. Furthermore, by making the protrusion 31c annular, the structural strength of the protrusion 31c can be increased.

[0074] Although the convex portion 31c is preferably annular from the viewpoint of preventing tilting of the bearing 9 and improving structural strength, it may be divided in the circumferential direction, or may have one or more piece-shaped or protruding portions, and may be modified as appropriate. When a plurality of piece-shaped or protruding portions are formed, it is preferable that they are evenly spaced.

[0075] Furthermore, the body 3 is composed of a fixed iron core 30 having a cylindrical shape with a bottom and a holding member 31 that holds the bearing 9, which are separate bodies. This allows the bearing 9 to be arranged by assembling the holding member 31, to which the bearing 9 is fixed, to the fixed iron core 30. In other words, the arrangement of the bearing 9 is simple.

[0076] Furthermore, since the fixed core 30 has an integral structure, the axial centers of the first fixed core 130A and the second fixed core 130B of Example 2, which will be described later, are already aligned at the small diameter peripheral wall 34. This allows the body 3 to be assembled simply by assembling the holding member 31 to the fixed core 30. In other words, assembly of the body 3 is easy.

[0077] Here, modifications 1 to 5 of the retaining mechanism will be described with reference to FIG.

[0078] 2(a) showing Modification 1, the holding member 131 has a through-hole 131d formed in a base 131a that passes through the holding member 131 in the axial direction. The bearing 109 has a cylindrical portion 109a extending in the axial direction and a flange 109b that serves as a retaining mechanism. The flange 109b is formed in an annular shape that protrudes radially outward from the right end of the cylindrical portion 109a in the axial direction.

[0079] The cylindrical portion 109a is fitted into a through-hole 131d formed in the base portion 131a.

[0080] The flange 109b abuts against an axially right end surface 131f of the base portion 131a, thereby restricting the movement of the bearing 109 even if it attempts to move axially to the left.

[0081] In this way, by using the flange 109b as the retaining mechanism, the retaining mechanism can be easily configured.

[0082] It should be noted that the flange 109b is preferably annular from the viewpoint of preventing tilting of the bearing 109 and of structural strength, but it may be divided in the circumferential direction, or may have one or more piece-shaped or protruding parts formed thereon, and may be modified as appropriate. When a plurality of piece-shaped or protruding parts are formed, it is preferable that they are evenly spaced.

[0083] 2B showing Modification 2, a diameter-enlarged annular recess 231e is formed at the right end of the through-hole 231d in the holding member 231. A flange 209b of the bearing 209 is fitted and fixed in the recess 231e.

[0084] With this configuration, the dimension by which the bearing 209 protrudes to the right in the axial direction beyond the holding member 231 can be reduced, or it is possible to prevent the bearing 209 from protruding to the right in the axial direction.

[0085] Furthermore, by forming a recess 231e in the holding member 231, it is possible to reduce the radial thickness on the movable core 4 side, i.e., on the right side in the axial direction, which makes it easier for the magnetic flux transmitted from the movable core 4 to the holding member 231 to concentrate on the fixed core 30 side than in the first embodiment, making it easier to obtain a stronger attractive force.

[0086] Referring to FIG. 2C showing Modification 3, the retaining mechanism of this modification is constituted by a through-hole 331 d in the holding member 331 and a bearing 309 .

[0087] The through-hole 331d has a tapered shape that narrows toward the left in the axial direction. The bearing 309 has a cylindrical shape that narrows toward the left in the axial direction. This restricts the movement of the bearing 309, which is fitted and fixed in the through-hole 331d, even if it tries to move toward the left in the axial direction.

[0088] As illustrated in Example 1 and Variations 1 to 3, the anti-slip mechanism need only be configured to prevent the bearing from slipping out of the storage section into the interior of the machine by engaging the retaining member with the bearing, and its structure may be modified as appropriate.

[0089] 2(d) showing Modification 4, the retaining mechanism of this modification is configured by a plurality of bolts 11 threaded into a holding member 431. The bolts 11 are evenly spaced. Note that the number and arrangement of the bolts 11 may be changed as appropriate.

[0090] More specifically, a female thread portion 431g extending axially rightward from the axially left end face is formed on the base portion 431a of the holding member 431. The male thread portion 11a of the bolt 11 is threadedly engaged with the female thread portion 431g.

[0091] The head 11b of the bolt 11 protrudes radially inward beyond the inner circumferential surface that defines the through hole 431d in the retaining member 431. As a result, even if the bearing 9 attempts to move axially leftward, it abuts against the head 11b, thereby restricting the movement.

[0092] 2( e) showing Modification 5, the retaining mechanism of this modification is configured by a plurality of bolts 111 that are threaded into the holding member 531. The bolts 111 are evenly spaced. Note that the number and arrangement of the bolts 111 may be changed as appropriate.

[0093] More specifically, a female thread portion 531g that penetrates radially is formed on the left axial side of the base portion 531a of the holding member 531. The male thread portion 111a of the bolt 111 is threadedly engaged with the female thread portion 531g. As a result, even if the bearing 9 attempts to move axially to the left, it abuts against the male thread portion 111a and the movement is restricted.

[0094] As exemplified in the fourth and fifth modified examples, the retaining mechanism may be configured such that the holding member and the bearing are separate members.

[0095] A solenoid device according to a second embodiment will be described with reference to Fig. 3. Note that the description of the same configuration as in the first embodiment will be omitted.

[0096] 3, in this embodiment, the body 103 of the solenoid device 101 has a first stationary core 130A, a second stationary core 130B, a holding member 31, and a non-magnetic member 39. In this embodiment, the first stationary core 130A is fixed to the solenoid case 106 by screwing, and the space between the solenoid case 106 and the first stationary core 130A is sealed with packing. The solenoid case may be part of the device to which the solenoid is to be attached (not shown), or may be attached and fixed to the device to which the solenoid is to be attached.

[0097] The first fixed core 130A is molded into an integral stepped cylindrical shape having, in order from the left in the axial direction, a large diameter peripheral wall 32, an annular side wall 33, and a small diameter peripheral wall 137.

[0098] The small diameter peripheral wall 137 is cylindrical and has an outer stepped shape that extends axially from the inner diameter end of the annular side wall 33. The tip of the small diameter peripheral wall 137, i.e., the right end in the axial direction, has a stepped tapered shape that narrows toward the inner diameter side.

[0099] The second fixed core 130B is molded into an integral cylindrical shape with a bottom, having, from the axial left side, a small diameter peripheral wall 138 and a side wall 35.

[0100] The small diameter peripheral wall 138 is formed in a stepped cylindrical shape. The right end of the small diameter peripheral wall 138 is closed by the side wall 35.

[0101] The non-magnetic member 39 is made of a non-magnetic material such as an aluminum alloy and has a cylindrical shape with an inner step. The non-magnetic member 39 has a cylindrical portion 39a extending in the axial direction. An annular protrusion 39b that protrudes toward the inner diameter side is formed at the axial center of the cylindrical portion 39a.

[0102] A small diameter peripheral wall 137 of the first stator core 130A is fitted and fixed in the cylindrical portion 39a in a sealed manner from left to right in the axial direction. Also, a small diameter peripheral wall 138 of the second stator core 130B is fitted and fixed in the cylindrical portion 39a in a sealed manner from right to left in the axial direction. In other words, the first stator core 130A and the second stator core 130B are connected by the non-magnetic member 39.

[0103] The first stationary core 130A and the second stationary core 130B are connected by the non-magnetic member 39, and the axes of the small diameter peripheral walls 137 and 138 are substantially aligned.

[0104] The first stationary core 130A, the second stationary core 130B, the non-magnetic member 39, and the holding member 31 fitted and fixed to the first stationary core 130A form a housing portion S12.

[0105] Additionally, the annular protrusion 39b of the non-magnetic member 39 is disposed axially between the small diameter peripheral wall 137 of the first stationary core 130A and the small diameter peripheral wall 138 of the second stationary core 130B.

[0106] That is, the small diameter peripheral wall 137 of the first stationary core 130A and the small diameter peripheral wall 138 of the second stationary core 130B are prevented from contacting each other by the annular protrusion 39b of the non-magnetic member 39.

[0107] The magnetic path formed when current is applied to the coil 2 is mainly composed of the annular side wall 33 of the first fixed core 130A, the solenoid case 106, the plate 7, the small diameter peripheral wall 138 of the second fixed core 130B, the movable core 4, and the small diameter peripheral wall 137 of the first fixed core 130A.

[0108] Furthermore, the small diameter peripheral wall 137 of the first stator core 130A and the small diameter peripheral wall 138 of the second stator core 130B are spaced apart, and furthermore, an annular protrusion 39b of the non-magnetic member 39 made of a non-magnetic material is interposed between them. This makes it easier to transmit magnetic flux to the movable core 4 more efficiently than the stator core 30 of the first embodiment.

[0109] In this way, the shape of the body may be changed as appropriate as long as a magnetic path can be formed.

[0110] Furthermore, even if the body 103 is made up of a plurality of members, the holding member 31 can prevent the bearing 9 from slipping out into the interior S1 of the machine.

[0111] Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes modifications and additions that do not deviate from the gist of the present invention.

[0112] For example, in the first and second embodiments, the working fluid flows through the interior of the machine and the housing, and the atmosphere flows through the space outside the machine. However, the present invention is not limited to this, and a fluid other than the working fluid other than the atmosphere may flow through the space outside the machine. The fluid flowing through the interior of the machine and the housing and the fluid flowing through the space outside the machine may be the same fluid. In other words, the working fluid may also flow through the space outside the machine.

[0113] Furthermore, in the first and second embodiments, a damper was used as an example of the actuating device, but this is not limited thereto and any other suitable device may be used as long as it is driven by a solenoid device. Furthermore, the present invention may be applied to a device in which there is almost no differential pressure between the interior of the machine and the housing. Even in such an application environment, even if the bearing attempts to move toward the interior of the machine due to external disturbances or the like, it is possible to prevent the bearing from coming loose.

[0114] Furthermore, in the first and second embodiments, the holding member is described as being separate from the fixed iron core, but this is not limiting, and the holding member may be provided integrally with the fixed iron core.

[0115] In addition, in the first and second embodiments, the holding member is described as being made of a magnetic material, but this is not limiting and the holding member may be made of a non-magnetic material. In such a configuration, it is preferable to provide a magnetic member separate from the holding member at a position overlapping with the movable core in the axial direction.

[0116] REFERENCE SIGNS LIST 1 solenoid device 2 coil 3 body 4 movable iron core 5 shaft body 8, 9 bearing 30 fixed iron core 31 holding member 40 communication hole 50 communication hole 101 solenoid device 103 body 130A first fixed iron core 130B second fixed iron core 39 non-magnetic member 109 bearing 131, 231 holding member 109b flange (retaining mechanism) 309 bearing (retaining mechanism) 331 holding member (retaining mechanism) 431, 531 holding member 11, 111 bolt (retaining mechanism) A atmosphere F operated fluid S1 inside the machine (inside the machine) S2, S12 accommodation section S3 space outside the machine

Claims

1. A solenoid device comprising a coil, a body, a movable iron core placed in a housing formed on the inner diameter side of the body, a shaft that moves together with the movable iron core, and a bearing that extends from the housing side to the inside of the machine and guides the movement of the shaft, wherein the housing side and the inside of the machine are fluidly connected, and the solenoid device has a stop mechanism that restricts the bearing from moving from the housing side to the inside of the machine.

2. The solenoid device according to claim 1, wherein the retaining mechanism is a protrusion that protrudes toward the inner diameter side on the inside of the body.

3. The solenoid device according to claim 2, wherein the protrusion is disposed between the inside of the machine and the bearing.

4. The solenoid device according to claim 2, wherein the protrusion is annular.

5. The solenoid device according to claim 1, wherein the retaining mechanism is a flange of the bearing.

6. A solenoid device according to any one of claims 1 to 5, wherein the body has a cylindrical fixed iron core with a bottom and a holding member for holding the bearing.

7. The solenoid device according to claim 6, wherein said fixed core has an integral structure capable of accommodating said movable core.

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