Solenoid device

Abstract

A solenoid device is provided that prevents the bearing from detaching from the machine interior. A solenoid device (1) includes: a coil (2); a body (3); a movable iron core (4) disposed in a receiving portion (S2) formed on the inner diameter side of the body (3); a shaft (5) that moves together with the movable iron core (4); and a bearing (9) that extends from the receiving portion (S2) side toward the machine interior (S1) and guides the movement of the shaft (5), wherein the receiving portion (S2) and the machine interior (S1) are in fluid communication, wherein the solenoid device (1) has an anti-detachment mechanism (31c) that restricts the movement of the bearing (9) from the receiving portion (S2) side toward the machine interior (S1).

Description

Technical Field

[0001] This invention relates to solenoid devices, such as solenoid devices that utilize a movable iron core to operate various devices. Background Technology

[0002] Solenoid devices are used as a means of operating various devices such as valves or machinery in various industrial fields. These devices operate by electromagnetically moving a movable iron core, which is configured to reciprocate by energizing a coil.

[0003] Patent Document 1 shows a solenoid device comprising a solenoid body, a plunger, a central post, a sleeve, a cap, a rod, and a bearing. The solenoid body has a coil. The solenoid body is hollow. On the inner diameter side of the solenoid body, a receiving portion for housing the plunger is formed by the central post, the sleeve, and the cap. The rod is connected to the plunger. A bearing is disposed within a through hole extending axially through the central post. The rod is inserted through this bearing. Thus, the rod, which moves axially along with the plunger, is guided by the bearing and is not easily tilted, thereby stabilizing the stroke of the rod relative to the amount of electricity supplied to the solenoid body.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 9-89145 (pages 4 and 5) Figure 1 ) Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In the solenoid device described in Patent Document 1, the rod has an axially penetrating flow path, allowing the working fluid to flow through the housing and the internal space on the working side. Furthermore, the plunger has an axially penetrating hole, and the space in the housing closer to the center of the plunger communicates with the space on the cover side. This reduces the resistance generated when the plunger and rod move, thus facilitating smooth movement of the plunger and rod.

[0009] However, in solenoid devices like those in Patent Document 1, a pressure differential sometimes occurs between the housing and the inner side of the machine. In particular, when the fluid pressure in the housing is relatively higher than the fluid pressure inside the machine, the bearing may move inward and detach.

[0010] This invention was made in view of such a problem, and its purpose is to provide a solenoid device that can prevent the bearing from falling into the machine.

[0011] Methods for solving problems

[0012] To address the aforementioned issues, the solenoid device of the present invention comprises: a coil; a main body; a movable iron core disposed in a receiving portion formed on the inner diameter side of the main body; a shaft that moves together with the movable iron core; and a bearing extending from the receiving portion side toward the inner side of the machine to guide the movement of the shaft. The receiving portion is in fluid communication with the inner side of the machine. The solenoid device has an anti-detachment mechanism that restricts the bearing from moving from the receiving portion side toward the inner side of the machine. Thus, even if a pressure differential occurs between the receiving portion side and the inner side of the machine, the bearing can be prevented from detaching toward the inner side of the machine.

[0013] The anti-detachment mechanism can also be a protrusion protruding from the inner side of the main body towards the inner diameter side. This allows for a simple construction of the anti-detachment mechanism.

[0014] The protrusion can also be located between the inner side of the machine and the bearing. This allows for a simpler structure to prevent the bearing from detaching into the machine.

[0015] The protrusion can also be annular. This more reliably prevents the bearing from detaching into the machine. Additionally, it improves the structural strength of the protrusion.

[0016] The anti-detachment mechanism can also be the flange of the bearing. Therefore, an anti-detachment mechanism can be easily constructed.

[0017] The main body can have a bottomed cylindrical fixed iron core and a retaining component to hold the bearing. This allows for easy configuration of the bearing.

[0018] The fixed iron core can also be an integral structure capable of housing the movable iron core. Therefore, the main body can be assembled simply by attaching the retaining part to the fixed iron core, making assembly easy. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the solenoid device according to Embodiment 1 of the present invention.

[0020] Figure 2 (a) is a cross-sectional view of a modified example 1 of the anti-detachment mechanism. Figure 2 (b) is a cross-sectional view of a modified example 2 of the anti-detachment mechanism. Figure 2 (c) is a cross-sectional view of a modified example 3 of the anti-detachment mechanism. Figure 2 (d) is a cross-sectional view of a modified example 4 of the anti-detachment mechanism. Figure 2 (e) is a cross-sectional view of a modified example 5 of the anti-detachment mechanism.

[0021] Figure 3 This is a cross-sectional view of the solenoid device according to Embodiment 2 of the present invention. Detailed Implementation

[0022] Hereinafter, the solenoid apparatus for implementing the present invention will be described based on embodiments.

[0023] Example 1

[0024] Reference Figure 1 , Figure 2 The solenoid device of Example 1 will be described below. Figure 1 The left and right sides are explained as the left and right sides of the solenoid device.

[0025] like Figure 1 As shown, the solenoid device 1 is a solenoid mainly composed of a coil 2, a main body 3, a movable iron core 4, a shaft 5, a solenoid housing 106, a plate 7, two bearings 8 and 9, and a cover 10.

[0026] The coil 2 mainly comprises: a ring-shaped frame 20 formed of an insulator; and a wire 21 wound a predetermined number of turns around the outer periphery of the frame 20. The wire 21 is connected to a lead 22. Power is supplied to the coil 2 via the lead 22 from a power source (not shown), and the coil 2 generates magnetic flux.

[0027] The coil 2 is inserted into the small-diameter circumferential wall 34 of the main body 3. In other words, a portion of the main body 3 is located on the inner diameter side of the coil 2. Furthermore, the coil 2 is axially clamped and fixed by the annular sidewall 33 of the main body 3 and the plate 7.

[0028] The main body 3 has a stepped, bottomed cylindrical fixed iron core 30 with a magnetic material such as iron and a stepped cylindrical retaining member 31 with a magnetic material.

[0029] The fixed iron core 30 is an integral structure consisting of a large-diameter circumferential wall 32, an annular side wall 33, a small-diameter circumferential wall 34, and a side wall 35, starting from the left side of the axial direction.

[0030] The large-diameter circumferential wall 32 is cylindrical in shape, extending along the axial direction.

[0031] The annular sidewall 33 extends from the axial right end of the large-diameter circumferential wall 32 toward the inner diameter side. An annular step portion 33a is formed at the intersection of the annular sidewall 33 and the small-diameter circumferential wall 34. The annular step portion 33a is recessed from the axial left end of the annular sidewall 33 toward the axial right end and is open toward the axial left end and the inner diameter side.

[0032] The surface to the right of the annular step portion 33a is the inner circumferential surface 34a of the small-diameter circumferential wall 34.

[0033] The small-diameter peripheral wall 34 is a stepped cylindrical shape extending axially from the inner diameter end of the annular sidewall 33.

[0034] The inner circumferential surface 34a of the small-diameter peripheral wall 34 extends in a straight line along the axial direction. Furthermore, the inner circumferential surface 34a extends approximately parallel to the axis of the small-diameter peripheral wall 34. That is, the inner diameter of the small-diameter peripheral wall 34 is approximately constant within the axial range.

[0035] An annular recess 36, which is trapezoidal in cross-section, is formed on the left side of the center of the small-diameter peripheral wall 34. The annular recess 36 is recessed into the inner diameter side from the outer circumference of the small-diameter peripheral wall 34 and opens towards the outer diameter side.

[0036] The radial dimension, i.e. the wall thickness, of the smaller diameter peripheral wall 34 is approximately constant compared to the portion of the annular recess 36 located on both sides of the axial direction.

[0037] The portion of the small-diameter peripheral wall 34 located in the annular recess 36 that is most recessed towards the inner diameter side has the thinnest wall thickness. This thinnest portion is designated as the thin-walled portion 34b.

[0038] The thin-walled portion 34b is cylindrical in shape, extending with approximately the same wall thickness in the circumferential direction. The thin-walled portion 34b is the thinnest part of the small-diameter circumferential wall 34, and has the highest magnetic reluctance in the small-diameter circumferential wall 34.

[0039] Furthermore, in the following description, the portion of the small-diameter peripheral wall 34 that is axially to the left of the thin-walled portion 34b will be designated as the first peripheral wall portion 37, and the portion that is axially to the right of the thin-walled portion 34b will be designated as the second peripheral wall portion 38.

[0040] The side wall 35 is continuous with the right end of the small diameter peripheral wall 34, thus closing the right end of the small diameter peripheral wall 34.

[0041] A stepped recess 35a is formed at the center of the inner diameter side of the sidewall 35. The recess 35a is recessed from the axial left end of the sidewall 35 to the axial right end and opens to the axial left end. The axis of the stepped recess 35a is approximately aligned with the axis of the small diameter peripheral wall 34.

[0042] The axial left side portion of the stepped recess 35a is enlarged, and a bearing 8 is embedded and fixed within this enlarged portion.

[0043] The retaining member 31 has a cylindrical base 31a. An annular flange 31b extending outward is formed on the outer diameter side of the axial left end of the base 31a. The axis of the flange 31b is substantially aligned with the axis of the base 31a.

[0044] A protrusion 31c, serving as an anti-detachment mechanism, is formed on the inner diameter side of the axial left end of the base 31a. The protrusion 31c extends from the axial left end of the base 31a toward the inner diameter side, forming an annular shape. In other words, the protrusion 31c protrudes toward the inner diameter side. A through hole 31d extending axially is formed at the radial center of the protrusion 31c.

[0045] A recess 31e is formed on the right side of the base 31a, relative to the protrusion 31c. The recess 31e is recessed from the axial right end of the base 31a toward the axial left and opens toward the axial right. A bearing 9 is fixedly embedded in the recess 31e.

[0046] 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, but slightly larger than the outer diameter of the shaft 5. Furthermore, the axis of the through hole 31d and the axis of the recess 31e are approximately aligned with the axis of the base 31a.

[0047] The retaining member 31 is embedded and fixed to the annular sidewall 33 of the fixed iron core 30. Specifically, the base 31a of the retaining member 31 is inserted into the small-diameter circumferential wall 34 of the fixed iron core 30. The flange 31b of the retaining member 31 is embedded in the annular stepped portion 33a of the fixed iron core 30. Furthermore, the flange 31b can be fixed to the fixed iron core 30 by appropriate methods such as welding, bonding, or chiseling. The same method applies to fixing the movable iron core 4 to the shaft 5.

[0048] With the retaining component 31 fixed to the fixed iron core 30, the axis of bearings 8 and 9 is approximately aligned with the axis of the small-diameter peripheral wall 34. That is, the axis of bearings 8 and 9 can be approximately aligned simply by fixing the retaining component 31 to the fixed iron core 30, thus simplifying assembly.

[0049] The space enclosed by the large-diameter peripheral wall 32 of the fixed iron core 30, the annular side wall 33, and the retaining member 31 is the machine interior S1. The machine interior S1 is the space on the working object side where the valve core and the like are arranged, and the working fluid F flows through it. In other words, the protrusion 31c is arranged between the bearing 9 and the machine interior S1.

[0050] The space surrounded by the small-diameter peripheral wall 34, side wall 35 and retaining member 31 of the fixed iron core 30 is the storage part S2 for storing the movable iron core 4.

[0051] The movable iron core 4 is formed into a cylindrical shape from a magnetic material such as iron. The outer diameter of the movable iron core 4 is approximately the same throughout the axial direction. The diameter of the movable iron core 4 is slightly smaller than the inner diameter of the small-diameter peripheral wall 34 of the fixed iron core 30. The movable iron core 4 is disposed in a receiving portion S2 formed on the inner diameter side of the main body 3. The movable iron core 4 can reciprocate along the axial direction within the receiving portion S2.

[0052] A shaft 5 is inserted and fixed to the radial center of the movable iron core 4. Furthermore, a through hole 40 is formed on the movable iron core 4 at a position on the outer diameter side of the shaft 5.

[0053] Furthermore, the movable iron core 4 is pressed away from the holding member 31, i.e., axially to the right, by a force-applying unit (not shown). The force-applying unit can be located between the movable iron core 4 and the holding member 31 or inside the machine S1. The force-applying unit can be a disc spring, a compression spring, a bellows, etc.

[0054] The shaft body 5 is formed into a cylindrical shape using a non-magnetic material such as aluminum alloy. A through hole 50 extending axially is formed in the radial center of the shaft body 5.

[0055] The right side of the shaft 5 is inserted through the bearing 8, and the left side is inserted through the through hole 31d of the bearing 9 and the retaining member 31. The shaft 5 can slide relative to the bearings 8 and 9.

[0056] The connecting hole 50 of the shaft 5 is connected to the interior S1 of the main body 3 and the stepped recess 35a, respectively. The stepped recess 35a is connected to the receiving part S2 via the gap between the bearing 8 and the side wall 35, the gap between the bearing 8 and the shaft 5, etc. That is, the interior S1 and the receiving part S2 are in fluid communication, and the working fluid F can also flow in the receiving part S2.

[0057] Furthermore, the fixed iron core 30 is a bottomed cylindrical shape with an opening on the inner side of the machine, and is fixed to the working device in a sealed manner. In this state, the storage part S2 is not connected to the space S3 on the outer side of the machine. In this embodiment, the space S3 on the outer side of the machine is the space on the outer side of the solenoid device 1 and the actuating device, and is open to the atmosphere A.

[0058] The solenoid housing 6 is formed into a cylindrical shape from a magnetic material such as iron. The solenoid housing 6 is externally embedded and fixed to the large-diameter circumferential wall 32 and the plate 7 of the main body 3. The solenoid housing 6 and the large-diameter circumferential wall 32 are sealed by a packing seal. Furthermore, the solenoid housing can be either part of an installed device (not shown) or fixed to the installed device.

[0059] Plate 7 is formed into a ring shape from a magnetic material such as iron. Plate 7 is externally fixed to the small-diameter peripheral wall 34 of the main body 3.

[0060] The cover 10 is formed into a bottomed cylindrical shape from an insulator. The cover 10 is externally fitted into the small-diameter circumferential wall 34 and internally fixed to the axial right end of the solenoid housing 6. The solenoid housing 6 and the cover 10 are sealed by a packing seal.

[0061] Next, the driving of the solenoid device 1 will be explained.

[0062] First, let's explain the situation when coil 2 is not energized. In this state, the movable iron core 4 is stationary at the position furthest from the holding member 31.

[0063] When energized coil 2, magnetic flux is generated. In solenoid device 1, a magnetic circuit is formed based on the magnetic flux generated in coil 2. Specifically, this magnetic circuit is mainly composed of the annular sidewall 33 of the main body 3, the solenoid housing 6, the plate 7, the second peripheral wall portion 38 of the small-diameter peripheral wall 34 of the main body 3, the movable iron core 4, and the first peripheral wall portion 37 of the small-diameter peripheral wall 34.

[0064] As described above, the thin-walled portion 34b has high magnetic resistance, so magnetic flux can be easily transmitted from the first peripheral wall portion 37 of the main body 3 to the movable iron core 4.

[0065] Furthermore, the left end of the second peripheral wall portion 38 of the main body 3 is a conical shape in which the wall thickness increases as it moves toward the axial right. That is, the magnetic reluctance decreases as it moves toward the axial right.

[0066] When not energized or immediately after energization, the axial left end of the movable iron core 4 is located on the inner diameter side of the right end of the conical portion of the first circumferential wall 37. That is, it is located on the inner diameter side of the portion with high magnetic reluctance in the second circumferential wall 38. As a result, the magnetic flux transmitted from the movable iron core 4 to the first circumferential wall 37 flows in a direction inclined to the axial left, generating an attractive force that pulls the movable iron core 4 toward the axial left, i.e., toward the holding member 31.

[0067] When the attractive force exceeds the force exerted by the force-applying unit, the movable iron core 4 moves toward the retaining member 31.

[0068] The shaft 5 moves integrally with the movable iron core 4. At this time, the shaft 5 is guided by bearings 8 and 9 to move along the axis of the small-diameter peripheral wall 34. Accompanying this, the movable iron core 4 also moves along the axis of the small-diameter peripheral wall 34.

[0069] With the help of the connecting hole 40 or the connecting hole 50, the resistance generated when the movable iron core 4 and the shaft 5 move in the machine interior S1 and the receiving part S2 where the working fluid F flows in is reduced.

[0070] The movable iron core 4 stops at a position where the attractive force and the force applied by the force unit are balanced, or stops by abutting against a stop (not shown).

[0071] Furthermore, as the movable iron core 4 approaches the holding member 31, the magnetic flux transmitted from the movable iron core 4 to the first peripheral wall portion 37 gradually stops tilting to the left axially, and the magnetic flux flowing in approximately the radial direction increases.

[0072] On the other hand, when the movable iron core 4 approaches the holding member 31, magnetic flux is also transmitted from the movable iron core 4 to the holding member 31. The direction of the magnetic flux transmitted from the movable iron core 4 to the holding member 31 is approximately the same as the direction in which the movable iron core 4 is attracted. Thus, it is easy to obtain an attractive force that further attracts the movable iron core 4 toward the holding member 31.

[0073] When the current flowing through coil 2 decreases or stops, the movable iron core 4 moves axially to the right with the help of the force applied by the force unit (not shown).

[0074] Next, the method for preventing bearing 9 from falling off will be explained. For example, in the case where the working device is a pilot valve such as a damper, the receiving part S2 is always connected to the space where the pilot pressure is generated via the communicating hole 50 of the shaft body 5. That is, the fluid pressure in the receiving part S2 is approximately the same as the pilot pressure. The narrower the opening of the pilot valve, the easier it is for the pilot pressure to rise. The pilot pressure can reach its maximum when the pilot valve is closed.

[0075] Furthermore, a pilot valve is positioned between the space generating the pilot pressure and the internal space S1. When the pilot valve is closed, the internal space S1 is not connected to the space generating the pilot pressure, but it remains connected to the return path to the damper side. That is, the fluid pressure inside the internal space S1 can be minimized.

[0076] When the fluid pressure in the receiving section S2 becomes higher than the fluid pressure inside the machine S1, the force acting on the bearing 9 in the axial direction to the left increases. The greater this force acting in the axial direction to the left, the easier it is for the bearing 9 to move to the left.

[0077] In this embodiment, a protrusion 31c is formed at a position axially to the left of the bearing 9. Therefore, even if the bearing 9 wishes to move axially to the left, its movement can be restricted by abutting against the protrusion 31c. That is, it prevents it from falling out of the storage section S2 into the machine interior S1.

[0078] As explained above, the anti-detachment mechanism in this embodiment is a protrusion 31c that protrudes inward from the bearing diameter side, located closer to the receiving portion S2 than the bearing 9. This allows for a simple construction of the anti-detachment mechanism.

[0079] Furthermore, the protrusion 31c is located between the S1 side inside the machine and the bearing 9, so even if the part described later is not formed... Figure 2 The cylindrical bearing 9 with flange 109b, as shown in (a) of the modified examples 1 to 3, can also prevent the bearing 9 from falling off simply by placing the bearing 9 in the recess 31e. Compared with the modified examples 2 and 3, which have different shapes not only for the bearing but also for the retaining member, the retaining member 31 of this embodiment can prevent the bearing 9 from falling off into the machine with a simple structure.

[0080] Furthermore, since the protrusion 31c is annular, the bearing 9, which abuts against the protrusion 31c, is less likely to tilt. Thus, the protrusion 31c reliably prevents the bearing 9 from falling into the machine interior S1. Moreover, by making the protrusion 31c annular, its structural strength can be improved.

[0081] Furthermore, from the viewpoint of preventing bearing 9 from tilting and structural strength, the protrusion 31c is preferably annular, but it can also be divided in the circumferential direction, or it can be formed as one or more plate-shaped or protruding protrusions, and can be modified appropriately. When multiple plate-shaped or protruding protrusions are formed, an equal arrangement is preferred.

[0082] Furthermore, in the main body 3, the bottom cylindrical fixed iron core 30 and the retaining member 31 that holds the bearing 9 are separate components. Therefore, the bearing 9 can be configured by assembling the retaining member 31, to which the bearing 9 is fixed, onto the fixed iron core 30. That is, the configuration of the bearing 9 is simple.

[0083] Furthermore, since the fixed core 30 is a single-piece structure, the alignment of the axes of the first fixed core 130A and the second fixed core 130B in Embodiment 2, described later, is completed on the small-diameter peripheral wall 34. Therefore, the main body 3 can be assembled simply by assembling the retaining member 31 to the fixed core 30. In other words, the assembly of the main body 3 is simple.

[0084] Here, refer to Figure 2 The following describes variations 1 to 5 of the anti-detachment mechanism.

[0085] Referring to the modified example 1 Figure 2 In (a), in the retaining member 131, a through hole 131d formed in the base 131a extends through in the axial direction. The bearing 109 has a cylindrical portion 109a extending in the axial direction and a flange 109b serving as an anti-disengagement mechanism. The flange 109b is formed as an annular shape protruding from the axial right end of the cylindrical portion 109a toward the outer diameter side.

[0086] The cylindrical portion 109a is embedded in the through hole 131d formed in the base portion 131a.

[0087] The flange 109b abuts against the axial right end face 131f of the base 131a. Thus, even if the bearing 109 wants to move axially to the left, its movement is restricted.

[0088] In this way, by setting the anti-detachment mechanism as flange 109b, the anti-detachment mechanism can be easily constructed.

[0089] Furthermore, from the viewpoint of preventing bearing 109 from tilting and structural strength, flange 109b is preferably annular, but it can also be divided in the circumferential direction, or it can be formed as one or more plate-shaped or protruding flanges, and can be modified appropriately. When multiple plate-shaped or protruding flanges are formed, an equal arrangement is preferred.

[0090] Refer to the modified example 2 shown. Figure 2(b) The right end of the through hole 231d of the retaining component 231 is an enlarged annular recess 231e. The flange 209b of the bearing 209 is embedded and fixed in the recess 231e.

[0091] With such a structure, the dimension by which the bearing 209 protrudes to the right axially compared to the retaining component 231 can be shortened, or the bearing 209 can be prevented from protruding to the right axially.

[0092] Furthermore, by forming a recess 231e in the retaining member 231, the radial thickness on the right side of the movable core 4 can be reduced. As a result, compared to the aforementioned embodiment 1, the magnetic flux transmitted from the movable core 4 to the retaining member 231 is more easily concentrated on the fixed core 30 side, thus making it easier to obtain an attractive force.

[0093] Referring to the modified example 3 shown Figure 2 (c) In this modified example, the anti-detachment mechanism is composed of the through hole 331d of the retaining member 331 and the bearing 309.

[0094] The through hole 331d is a tapered shape with a reduced diameter towards the left axial direction. Furthermore, the bearing 309 is a cylindrical shape with a tapered diameter that also reduces towards the left axial direction. Therefore, even if the bearing 309, which is fixed within the through hole 331d, wishes to move to the left axial direction, its movement is restricted.

[0095] As illustrated in Embodiment 1 and Modifications 1 to 3 above, the anti-detachment mechanism can be any structure that can prevent the bearing from falling out of the storage part into the machine by keeping the component engaged with the bearing, and its structure can be modified appropriately.

[0096] Refer to the modified example 4 shown. Figure 2 In (d), the anti-detachment mechanism of this modified example consists of a plurality of bolts 11 that engage with the retaining member 431. The bolts 11 are evenly arranged. Furthermore, the number and arrangement of the bolts 11 can be appropriately changed.

[0097] More specifically, an internal threaded portion 431g is formed on the base 431a of the retaining member 431, extending from the axial left end toward the axial right end. The external threaded portion 11a of the bolt 11 engages with the internal threaded portion 431g.

[0098] The head 11b of bolt 11 protrudes to a position closer to the inner diameter than the inner circumferential surface of the retaining member 431 that divides the through hole 431d. Thus, even if bearing 9 wants to move axially to the left, it will abut against the head 11b and its movement will be restricted.

[0099] Referring to the modified example 5 Figure 2 In (e), the anti-detachment mechanism of this modified example consists of a plurality of bolts 111 that engage with the retaining member 531. The bolts 111 are evenly arranged. Furthermore, the number and arrangement of the bolts 111 can be appropriately changed.

[0100] More specifically, a radially penetrating internal thread portion 531g is formed on the axial left side of the base 531a of the retaining member 531. The external thread portion 111a of the bolt 111 engages with the internal thread portion 531g. Thus, even if the bearing 9 wants to move axially to the left, it will abut against the external thread portion 111a, and its movement will be restricted.

[0101] As illustrated in the aforementioned variations 4 and 5, the anti-detachment mechanism can also be constructed using components different from the retaining components and bearings.

[0102] Example 2

[0103] Reference Figure 3 The solenoid device of Example 2 will be described. Furthermore, repeated structural descriptions identical to those of Example 1 will be omitted.

[0104] like Figure 3 As shown, in this embodiment, the main body 103 of the solenoid device 101 includes a first fixed iron core 130A, a second fixed iron core 130B, a retaining member 31, and a non-magnetic member 39. In this embodiment, the first fixed iron core 130A is fixed to the solenoid housing 106 by screwing, and the solenoid housing 106 and the first fixed iron core 130A are sealed by a packing seal. Furthermore, the solenoid housing can be either part of an installed device (not shown) or fixed to the installed device.

[0105] The first fixed iron core 130A is formed as an integral stepped cylindrical shape having a large-diameter peripheral wall 32, an annular side wall 33 and a small-diameter peripheral wall 137 sequentially from the left side of the axial direction.

[0106] The small-diameter peripheral wall 137 is a stepped cylinder extending axially from the inner diameter end of the annular sidewall 33. Furthermore, the front end of the small-diameter peripheral wall 137, i.e. the axial right end, is a stepped cone shape that narrows towards the inner diameter side.

[0107] The second fixed iron core 130B is formed as an integral bottomed cylindrical shape having a small-diameter peripheral wall 138 and a side wall 35 sequentially from the left side of the axial direction.

[0108] The narrow-diameter circumferential wall 138 is formed into a stepped cylindrical shape. The right end of the narrow-diameter circumferential wall 138 is closed by the side wall 35.

[0109] The non-magnetic component 39 is formed as a cylindrical shape with a stepped inner side, made of a non-magnetic material such as aluminum alloy. The non-magnetic component 39 has a cylindrical portion 39a extending axially. Furthermore, an annular protrusion 39b protruding towards the inner diameter side is formed at the axial center of the cylindrical portion 39a.

[0110] The small-diameter circumferential wall 137 of the first fixed iron core 130A is sealed and fixed to the cylindrical portion 39a from the left to the right axial direction. Furthermore, the small-diameter circumferential wall 138 of the second fixed iron core 130B is sealed and fixed to the cylindrical portion 39a from the right to the left axial direction. That is, the first fixed iron core 130A and the second fixed iron core 130B are connected by a non-magnetic component 39.

[0111] The small-diameter peripheral walls 137 and 138 of the first fixed iron core 130A and the second fixed iron core 130B, which are connected by non-magnetic component 39, have roughly the same axis.

[0112] The first fixed iron core 130A, the second fixed iron core 130B, the non-magnetic component 39, and the retaining component 31 embedded and fixed in the first fixed iron core 130A constitute the storage part S12.

[0113] Furthermore, the annular protrusion 39b of the non-magnetic component 39 is disposed between the small-diameter peripheral wall 137 of the first fixed iron core 130A and the small-diameter peripheral wall 138 of the second fixed iron core 130B in the axial direction.

[0114] That is, the annular protrusion 39b of the non-magnetic component 39 prevents the small-diameter peripheral wall 137 of the first fixed iron core 130A from contacting the small-diameter peripheral wall 138 of the second fixed iron core 130B.

[0115] The magnetic circuit formed when the coil 2 is energized is mainly composed of the annular sidewall 33 of the first fixed iron core 130A, the solenoid housing 106, the plate 7, the small-diameter peripheral wall 138 of the second fixed iron core 130B, the movable iron core 4, and the small-diameter peripheral wall 137 of the first fixed iron core 130A.

[0116] Furthermore, the small-diameter peripheral wall 137 of the first fixed iron core 130A is separated from the small-diameter peripheral wall 138 of the second fixed iron core 130B, and an annular protrusion 39b of a non-magnetic component 39 is sandwiched therebetween. As a result, compared with the fixed iron core 30 of the aforementioned embodiment 1, it is easier to efficiently transmit magnetic flux to the movable iron core 4.

[0117] In this way, as long as a magnetic circuit can be formed, the shape of the main body can be changed appropriately.

[0118] Furthermore, even when the main body 103 is composed of multiple parts, the retaining component 31 can prevent the bearing 9 from falling into the machine interior S1.

[0119] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the specific structure is not limited to these embodiments, and changes and additions that do not depart from the spirit of the present invention are also included in the present invention.

[0120] For example, in the aforementioned embodiments 1 and 2, a structure was described in which the working fluid circulates inside the machine and in the storage section, and atmospheric air circulates in the space outside the machine. However, this is not the only possibility. It is also possible for a structure to circulate a fluid other than the working fluid, other than atmospheric air, in the space outside the machine. The fluid circulating inside the machine and in the storage section and the fluid circulating in the space outside the machine can also be the same fluid. In other words, it is also possible for a structure in which the working fluid circulates in the space outside the machine.

[0121] Furthermore, while a damper was exemplified as the working device in the aforementioned embodiments 1 and 2, it is not limited to this; any device that requires a solenoid device for driving can be used, and can be appropriately modified. It can also be applied to devices where there is almost no differential pressure between the machine interior and the storage section. In such an application environment, even if the bearing wants to move inward due to interference, it can be prevented from falling off.

[0122] Furthermore, in the aforementioned embodiments 1 and 2, the structure in which the retaining component and the fixed iron core are separate has been described, but it is not limited to this, and it can also be integrally set with the fixed iron core.

[0123] Furthermore, in the aforementioned embodiments 1 and 2, the case where the retaining member is magnetic was described, but it is not limited to this and can also be non-magnetic. If such a structure is used, it is preferable that a magnetic member is provided independently of the retaining member at a position that overlaps with the movable iron core in the axial direction.

[0124] Label Explanation

[0125] 1: Solenoid assembly; 2: Coil; 3: Main body; 4: Movable iron core; 5: Shaft; 8, 9: Bearings; 30: Fixed iron core; 31: Holding component; 40: Connecting hole; 50: Connecting hole; 101: Solenoid assembly; 103: Main body; 130A: First fixed iron core; 130B: Second fixed iron core; 39: Non-magnetic component; 109: Bearing; 131, 231: Holding component; 109b: Flange (anti-detachment mechanism); 309: Bearing (anti-detachment mechanism); 331: Holding component (anti-detachment mechanism); 431, 531: Holding component; 11, 111: Bolt (anti-detachment mechanism); A: Atmosphere; F: Working fluid; S1: Machine interior (inner side); S2, S12: Storage section; S3: Space on the outer side of the machine.

Claims

1. A solenoid device, comprising: coil; main body; A movable iron core is disposed in a storage portion formed on the inner diameter side of the main body; The shaft, which moves together with the movable iron core; and A bearing, extending from the receiving section towards the inside of the machine, guides the movement of the shaft. The storage section is in fluid communication with the inside of the machine. in, The solenoid device has an anti-detachment mechanism that restricts the bearing from moving from the receiving part side to the inner side of the machine.

2. The solenoid device according to claim 1, characterized in that, The anti-detachment mechanism is a protrusion that extends from the inner side of the main body toward the inner diameter side.

3. The solenoid device according to claim 2, wherein, The protrusion is located between the inner side of the machine and the bearing.

4. The solenoid device according to claim 2, wherein, The protrusion is ring-shaped.

5. The solenoid device according to claim 1, characterized in that, The anti-detachment mechanism is the flange of the bearing.

6. The solenoid device according to any one of claims 1 to 5, characterized in that, The main body has a bottomed cylindrical fixed iron core and a retaining component for holding the bearing.

7. The solenoid device according to claim 6, wherein, The fixed iron core is an integral structure capable of housing the movable iron core.

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