WO2022230366A1 - アクチュエータ装置の製造方法およびアクチュエータ装置 - Google Patents
アクチュエータ装置の製造方法およびアクチュエータ装置 Download PDFInfo
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- WO2022230366A1 WO2022230366A1 PCT/JP2022/009648 JP2022009648W WO2022230366A1 WO 2022230366 A1 WO2022230366 A1 WO 2022230366A1 JP 2022009648 W JP2022009648 W JP 2022009648W WO 2022230366 A1 WO2022230366 A1 WO 2022230366A1
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- Prior art keywords
- cylinder
- rod
- actuator device
- inner cylinder
- pressure
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims description 18
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/56—Means for adjusting the length of, or for locking, the spring or damper, e.g. at the end of the stroke
Definitions
- the present disclosure relates to, for example, an actuator device manufacturing method and an actuator device.
- actuator device that serves as a shock absorber.
- the actuator device is provided between two members that relatively move, for example, between a sprung vehicle body and an unsprung wheel, between a sprung vehicle body and an unsprung bogie, or between a sprung vehicle and an unsprung truck. It is provided between the truck and the wheel (axle, wheelset) that is on the unsprung side.
- the actuator devices of Patent Documents 1 to 4 have an air chamber into which the rod moves in and out.
- the air chamber into which the rod enters and exits should preferably have a sealed structure in order to prevent water from being mixed with the oil due to condensation.
- the pressure in the air chamber changes as the rod moves in and out of the air chamber.
- a large reaction force air reaction force
- the thrust may be biased between the extension stroke and the retraction stroke of the actuator device.
- An object of an embodiment of the present invention is to provide an actuator device manufacturing method and an actuator device that can reduce thrust bias.
- One embodiment of the present invention relates to a method of manufacturing an actuator device, wherein the actuator device is provided between two members that move relatively, and the actuator device is attached to one of the two members. a first member attached and a second member attached to the other of the two members; the first member includes a first cylinder having a bottom portion at one end and an opening at the other end; a rod extending from the bottom of the cylinder toward the other end, and the second member is a second cylinder into which the rod is inserted and which slides on the outer circumference of the rod and whose one end is closed.
- the method for manufacturing the actuator device comprises: inserting the rod into the second cylinder; and the volume of the second cylinder changes due to pressure at positions other than the maximum length at which the relative position of the first member and the second member is maximized and the minimum length at which the relative position is minimized. and closing with a first fluid.
- one embodiment of the present invention relates to an actuator device, wherein the actuator device is provided between two members that relatively move, and the actuator device is attached to one of the two members.
- a second member attached to the other of the first member and the two members; and power means for operating the first member and the second member to move relative to each other, the first member comprising: A first cylinder having a bottom at one end and an opening at the other end, and a rod extending from the bottom inside the first cylinder to the other end, the rod being inserted into the second member.
- a second cylinder that slides on the outer circumference of the rod and whose one end is closed; and a closing member that is provided at the other end of the second cylinder, wherein the volume in the second cylinder is increased by pressure.
- a varying first fluid is enclosed and the pressure in the second cylinder is greater than atmospheric pressure at the minimum length the rod is fully inserted into the second cylinder, and the rod is pushed into the second cylinder. At maximum length exhausted from within 2 cylinders, it will be below atmospheric pressure.
- thrust bias can be reduced.
- FIG. 1 is a longitudinal sectional view showing an actuator device (electromagnetic actuator) according to a first embodiment
- FIG. FIG. 2 is a longitudinal sectional view showing the actuator device in FIG. 1 in a maximum length state (maximum stretched state);
- FIG. 2 is a longitudinal sectional view showing the actuator device in FIG. 1 in a minimum length state (minimum contraction state);
- It is a longitudinal cross-sectional view which shows the assembly process of an actuator apparatus in order of (1), (2), and (3).
- FIG. 5 is a vertical cross-sectional view showing assembly steps following (3) in FIG. 4 in the order of (4), (5), and (6); It is a longitudinal cross-sectional view which shows an assembly process from (6) in FIG. 5 in order of (6) and (7).
- an electromagnetic actuator 1 as an actuator device is configured as an electric linear motor (electric linear actuator).
- 2 shows the electromagnetic actuator 1 in the maximum length state (maximum extension state)
- FIG. 3 shows the electromagnetic actuator 1 in the minimum length state (maximum contraction state).
- the electromagnetic actuator 1 is mounted, for example, on a vehicle such as a railroad vehicle or an automobile, and constitutes an electromagnetic suspension device together with springs (suspension springs, coil springs, air springs) (not shown). That is, although illustration is omitted, the electromagnetic actuator 1 is connected with the spring, for example, between the sprung vehicle body and the unsprung wheel, between the sprung vehicle body and the unsprung bogie, Alternatively, it is provided between the bogie on the sprung side and the wheel (axle, wheelset) on the unsprung side.
- a member on the sprung side such as a vehicle body and a bogie is referred to as a "sprung member”.
- unsprung members such as trucks, wheels, axles, and wheel sets are called "unsprung members”.
- the electromagnetic actuator 1 includes, for example, a stator 2 arranged on the upper side of the spring and a mover 21 arranged on the lower side of the spring.
- the electromagnetic actuator 1 includes permanent magnets 22, 22 provided on a mover 21, which is a first member, and coil members 15 (coils 15A, 15B, 15C) of an armature 13 provided on a stator 2, which is a second member. ) constitute a three-phase linear motor (three-phase linear synchronous motor).
- the electromagnetic actuator 1 is configured as a cylindrical linear electromagnetic actuator composed of a pair of coaxial cylindrical members that are relatively displaceable. interposed in between.
- the electromagnetic actuator 1 includes permanent magnets 22, 22 as magnetic members provided in the outer cylinder 23 corresponding to the first cylinder, and the inner cylinder 3 corresponding to the second cylinder via the core member 14. and a coil member 15 (coils 15A, 15B, 15C) composed of a multi-phase coil group.
- the coil member 15 is arranged radially facing the permanent magnets 22 , 22 over the entire circumference.
- the stator 2 and the mover 21 of the electromagnetic actuator 1 are mounted between two members that relatively move (for example, between an unsprung member that is one of the two members and a sprung member that is the other of the two members). ing.
- the stator 2 and the mover 21 are arranged between the sprung member and the unsprung member so as to be linearly displaced relative to each other (relative movement), and are arranged in the axial direction, which is the stroke direction, that is, in the direction of relative displacement.
- a thrust force is generated in the vertical direction in FIG.
- the first member and the second member of the electromagnetic actuator 1 the case where the first member is the mover 21 and the second member is the stator 2 is exemplified.
- the first member may be the stator and the second member may be the mover. That is, the stator may be attached to the unsprung member (one of the two members), and the mover may be attached to the sprung member (the other of the two members).
- one of the two members (one side member) may be the sprung member, and the other of the two members (the other side member) may be the unsprung member.
- one axial end side of the electromagnetic actuator 1 is defined as the lower end side (lower end side in FIG. 1), and the other axial end side is defined as the upper end side (upper end side in FIG. 1). may be the upper end side, and the other axial end side may be the lower end side.
- the stator 2 of the electromagnetic actuator 1 has an armature 13 on its lower end side, which is one end side. That is, the stator 2 as a second member includes an inner cylinder 3, an outer shell 4 as a cover member, an intermediate cylinder 5 as a third cylinder, a bottom member 6, a closing member 7, an armature 13, and an annular member 12 .
- the inner cylinder 3 is formed as a tubular (cylindrical) tubular member (cylindrical member) extending in the vertical direction (axial direction).
- the intermediate cylinder 5 of the stator 2 and the outer cylinder 23 of the mover 21 are arranged radially outside the inner cylinder 3 .
- the inner cylinder 3 is arranged radially inside the outer cylinder 23 and the intermediate cylinder 5 .
- the inner cylinder 3 is arranged on the inner periphery of the outer cylinder 23 so as to be relatively movable in the axial direction of the outer cylinder 23 .
- An armature 13 is provided at the lower end, which is one end of the inner cylinder 3 .
- the lower end of the inner cylinder 3 extends axially along the inner peripheral side of the armature 13 (core member 14 ) and is inserted inside the core member 14 . That is, the lower end of the inner cylinder 3 extends to the armature 13 and is located on the inner peripheral side of the armature 13 .
- a bottom member 6 that closes the lower end of the inner cylinder 3 is fixed to the lower end of the inner cylinder 3 .
- the inner cylinder 3 and the bottom member 6 constitute a second cylinder, and the bottom member 6 corresponds to a closing portion (bottom portion) that closes one end of the second cylinder.
- the bottom member 6 has a small-diameter portion 6A inserted into the lower end side of the inner cylinder 3 and a large-diameter portion 6B having substantially the same outer diameter as the core member 14 of the armature 13 .
- the outer circumference of the small diameter portion 6A is a male threaded portion 6C.
- the male threaded portion 6C is screwed into a female threaded portion 3A provided on the lower end side of the inner cylinder 3 . That is, the bottom member 6 is fixed to the inner cylinder 3 by screwing together the male threaded portion 6C of the small diameter portion 6A and the female threaded portion 3A of the inner cylinder 3 .
- the bottom member 6 is provided with a through hole 6D axially passing through the small diameter portion 6A and the large diameter portion 6B.
- a rod 24 is inserted into the through hole 6 ⁇ /b>D of the bottom member 6 and the inner cylinder 3 .
- a sliding member (not shown) that slides on the outer peripheral surface of the rod 24 with low friction is provided in the through hole 6D.
- a seal member 6E is provided in the through hole 6D to seal between the rod 24 and the through hole 6D.
- the upper end which is the other end of the inner cylinder 3, is attached to the sprung member (the other of the two members).
- the upper end side of the inner cylinder 3 is closed by the closing member 7 .
- a closing member 7 is provided at the other end (upper end) of the inner cylinder 3 .
- the closure member 7 is fixed to the upper member 10 by bolts 9 .
- the upper end of the inner cylinder 3 is attached to the upper member 10 via the closing member 7 .
- the closing member 7 includes a small-diameter portion 7A inserted into the upper end side of the inner cylinder 3, a large-diameter portion 7B inserted into the upper end side of the intermediate cylinder 5, and upward from the center position in the radial direction of the large-diameter portion 7B. and a protruding portion 7C protruding.
- the outer circumference of the small diameter portion 7A is a male threaded portion 7D.
- the male threaded portion 7D is screwed into the female threaded portion 3B provided on the upper end side of the inner cylinder 3 . That is, the closing member 7 is fixed to the inner cylinder 3 by screwing the male threaded portion 7D of the small diameter portion 7A and the female threaded portion 3B of the inner cylinder 3 together.
- the outer circumference of the large diameter portion 7B is a male screw portion 7E.
- the male threaded portion 7E is screwed into the female threaded portion 5A provided on the upper end side of the intermediate cylinder 5.
- the blocking member 7 is fixed to the intermediate tube 5 by screwing the male threaded portion 7E of the large diameter portion 7B and the female threaded portion 5A of the intermediate tube 5 together.
- the projecting portion 7C is inserted through an insertion hole 10A provided in the upper member 10. As shown in FIG.
- the closing member 7 is provided with a through hole 7F that axially penetrates the small diameter portion 7A, the large diameter portion 7B and the projecting portion 7C.
- the through hole 7F corresponds to a communication hole that communicates the inside of the inner cylinder 3 with the outside.
- the opening of the through hole 7F on the projecting portion 7C side, which is the upper end side, is closed with a bolt 11 . That is, the upper end side of the through hole 7F (on the projecting portion 7C side) is a female thread, and the bolt 11 is screwed into this female thread.
- the bolt 11 corresponds to a plug member for opening and closing the through hole 7F.
- the upper member 10 serving as the second end member has a disk portion 10B having a larger diameter than the outer cylinder 23 of the mover 21.
- An insertion hole 10A through which the projecting portion 7C of the closing member 7 and the bolt 11 are inserted is provided at the center position in the radial direction of the disc portion 10B.
- the upper member 10 also includes a mounting eye 10C that is attached to, for example, a sprung member of a vehicle.
- the mounting eye 10C is provided integrally with the disk portion 10B.
- the upper member 10 constitutes an attachment member for attaching the inner cylinder 3, the intermediate cylinder 5 and the outer shell 4 together with the closing member 7 to the sprung member.
- a cylindrical outer shell 4 extending downward over the entire circumference is attached to the outer peripheral edge of the disc portion 10B.
- the outer shell 4 covers the intermediate cylinder 5 .
- the outer shell 4 covers the upper side or upper half of the outer cylinder 23 of the mover 21 .
- the stator 2 is provided with an outer shell 4 as a cover member located on the outer peripheral side of the outer cylinder 23 .
- the upper member 10 and the outer shell 4 protect the intermediate tube 5 and the outer tube 23 from flying stones and the like while the vehicle is running.
- the intermediate cylinder 5 is formed as a tubular (cylindrical) tubular member (cylindrical member) extending in the vertical direction (axial direction).
- the intermediate cylinder 5 is provided on the outer peripheral side of the inner cylinder 3 .
- the upper end side of the intermediate tube 5 is attached to the large diameter portion 7B of the closing member 7 . That is, the upper end side of the intermediate cylinder 5 is closed by the closing member 7 .
- a lower end portion of the intermediate cylinder 5 is connected to an annular member 12 provided on the upper side of the armature 13 .
- the intermediate cylinder 5 presses the armature 13 toward the bottom member 6 via the annular member 12 by screwing with the large diameter portion 7B of the closing member 7 .
- the armature 13 is integrated with the bottom member 6, the annular member 12, the intermediate tube 5, the inner tube 3, and the closing member 7 to form the stator 2 as a first member.
- the armature 13 is formed in an annular shape.
- the inner cylinder 3 is inserted into the inner peripheral portion (the space on the inner peripheral side) of the armature 13 .
- the armature 13 includes, for example, a substantially cylindrical core member 14 made of a magnetic material, and a plurality of coils 15A, 15B, and 15C (i.e., u-phase coil 15A, v-phase coil 15B and w-phase coil 15C).
- the core member 14 is provided on the lower end side of the inner cylinder 3 .
- the core member 14 has coil members 15, that is, coils 15A, 15B, and 15C on the outer periphery. Note that the number of coils 15A, 15B, and 15C is not limited to three, and can be appropriately changed, for example, to six, nine, twelve, etc., according to design specifications and the like.
- a stroke sensor for detecting the stroke amount of the electromagnetic actuator 1 is provided on the outer peripheral side of the annular member 12 .
- the stroke sensor measures the axial absolute or relative position between the armature 13 and the mover 21 (permanent magnets 22, 22).
- the stroke sensor is composed of a magnetic sensor such as a magnetoresistive element or Hall element (Hall IC) that detects magnetic field (magnetic field, magnetic flux) and polarity (magnetic pole) by using changes in magnetoresistance, Hall effect, etc. can be done.
- a magnetic sensor such as a magnetoresistive element or Hall element (Hall IC) that detects magnetic field (magnetic field, magnetic flux) and polarity (magnetic pole) by using changes in magnetoresistance, Hall effect, etc. can be done.
- the stroke sensor detects the magnetic field, polarity, etc. of the permanent magnets 22, 22 of the mover 21 displaced in the axial direction with respect to the stroke sensor. Thereby, the axial position (stroke position) of the permanent magnets 22, 22 can be calculated, and the necessary current can be supplied to the coils 15A, 15B, 15C of the stator 2 according to this position.
- the stroke sensor is not limited to a magnetic sensor, and various stroke sensors (displacement sensors) capable of measuring the axial relative position or absolute position between the armature 13 and the mover 21, such as a laser displacement meter. ) can be used.
- the lower end of the mover 21 is connected to the unsprung member of the vehicle.
- the mover 21 is provided with a magnetic field consisting of a plurality of permanent magnets 22 , 22 extending in the axial direction of the mover 21 and formed in an annular shape.
- the mover 21 has an outer cylinder 23 that is a cylindrical member and a lower member 25 that closes the lower end side of the outer cylinder 23 . That is, the mover 21 includes an outer cylinder 23 as a yoke arranged on the outer peripheral side of the armature 13 (the core member 14 and the coils 15A, 15B, 15C) and a lower member 25 fixed to the lower end side of the outer cylinder 23.
- a rod 24 positioned inside the outer cylinder 23 and extending axially from the lower member 25; and permanent magnets 22 , 22 .
- the mover 21 also has a ring member 26 attached to the upper end side of the outer cylinder 23 .
- the outer cylinder 23 and the lower member 25 constitute a first cylinder, and the lower member 25 corresponds to the bottom of the first cylinder.
- the outer cylinder 23 is made of, for example, a magnetic material that forms a magnetic path when placed in a magnetic field.
- a plurality of permanent magnets 22 , 22 are arranged in the axial direction inside the outer cylinder 23 in the radial direction.
- the outer cylinder 23 forms a magnetic circuit of the electromagnetic actuator 1 and also functions as a cover for preventing leakage of the magnetic flux of the permanent magnets 22, 22 to the outside.
- the outer cylinder 23 is formed as a tubular member (cylindrical member) extending vertically (axially).
- the outer cylinder 23 is provided on the outer peripheral side of the inner cylinder 3 and the intermediate cylinder 5 of the stator 2 .
- a lower end, which is one end of the outer cylinder 23, is attached to an unsprung member (one of the two members).
- the lower end side of the outer cylinder 23 is fixed to the lower member 25 . That is, the lower end of the outer cylinder 23 extends axially to the position of the lower member 25 and is closed by the lower member 25 .
- the lower end side of the outer cylinder 23 is fixed to the lower member 25 with bolts 27 .
- the lower member 25 which is the first end member, has a disc portion 25A having a larger diameter than the inner cylinder 3 (and the intermediate cylinder 5) of the stator 2.
- the disk portion 25A is provided with a bolt insertion hole 25B through which the bolt 27 is inserted.
- a lower end portion of the outer cylinder 23 is provided with a screw hole 23A corresponding to the bolt insertion hole 25B of the disk portion 25A.
- the outer cylinder 23 and the disk portion 25A are fixed by bolts 27 that are inserted into the bolt insertion holes 25B of the disk portion 25A and screwed into the screw holes 23A of the outer cylinder 23. As shown in FIG.
- the disk portion 25A is provided with a through hole 25C which is located on the inner diameter side of the bolt insertion hole 25B and penetrates in the axial direction.
- 25 C of through-holes correspond to the 2nd communicating hole which connects the inside and the exterior of the outer cylinder 23.
- the through hole 25C is closed with a bolt 28.
- the through hole 25C has a female thread, and the bolt 28 is screwed into this female thread.
- the bolt 28 corresponds to a second plug member for opening and closing the through hole 25C.
- the lower member 25 has a mounting eye 25D that can be attached to, for example, an unsprung member of a vehicle.
- the mounting eye 25D is provided integrally with the disk portion 25A.
- the lower member 25 constitutes an attachment member for attaching the outer cylinder 23 to the unsprung member.
- the lower member 25 is provided with a rod 24 axially extending from the lower member 25 to the inner side of the armature 13 and located axially opposite the mounting eye 25D.
- the rod 24 is positioned inside the outer cylinder 23 .
- the rod 24 is inserted into the inner cylinder 3 . That is, the rod 24 extends from the lower member 25 (disk portion 25A) toward the opening side of the outer cylinder 23, that is, toward the ring member 26 side.
- the rod 24 has a lower end, which is one end, attached to the lower member 25 (disk portion 25A).
- the rod 24 has an upper end, which is the other end, extending through the through hole 6 ⁇ /b>D of the bottom member 6 into the inner cylinder 3 , which is the inner peripheral portion of the armature 13 .
- the rod 24 may be formed integrally with the lower member 25, or may be separate from the lower member 25 and fixed to the lower member 25 by screwing.
- a piston 29 is provided on the tip side of the rod 24 .
- the piston 29 slides on the inner surface of the inner cylinder 3 to partition the interior of the inner cylinder 3 into two chambers.
- a communication passage 29 ⁇ /b>A is provided on the outer periphery of the piston 29 to communicate the two chambers partitioned by the piston 29 .
- the rod 24 is relatively displaced in the inner cylinder 3 in the axial direction. In this case, the outer peripheral surface of the piston 29 and the inner peripheral surface of the inner cylinder 3 slide, and the outer peripheral surface of the rod 24 and the sliding member provided in the bottom member 6 (through hole 6D) slide. Thereby, the rod 24 is guided to the inner cylinder 3 .
- the ring member 26 is provided at the upper end which is the other end of the outer cylinder 23 .
- the ring member 26 is formed in an annular shape, and is fixedly attached to the outer cylinder 23 by, for example, screwing or caulking.
- the ring member 26 separates the outer circumference of the intermediate cylinder 5 from the outside. Further, the ring member 26, for example, prevents the permanent magnets 22, 22 from slipping out of the outer cylinder 23, and positions the permanent magnets 22, 22 in the axial direction.
- a sliding member (not shown) that slides on the outer peripheral surface of the intermediate cylinder 5 with low friction is provided on the inner peripheral side of the ring member 26 .
- a seal member 26 ⁇ /b>A is provided on the inner peripheral surface of the ring member 26 to seal between the intermediate tube 5 and the ring member 26 .
- the intermediate cylinder 5 is axially displaced relative to the ring member 26 . In this case, the intermediate cylinder 5 is guided to the ring member 26 (that is, the outer cylinder 23) by the sliding between the outer peripheral surface of the intermediate cylinder 5 and the sliding member provided on the inner peripheral side of the ring member 26. .
- a plurality of permanent magnets 22 , 22 that serve as magnetic fields are provided in the mover 21 .
- the permanent magnets 22 , 22 are magnetic members that generate a magnetic field and are arranged in the outer cylinder 23 .
- the permanent magnets 22, 22 are each formed in an annular shape.
- the permanent magnets 22, 22 may be composed of, for example, a ring magnet that is integrally formed in a cylindrical shape, or a segmented magnet that is annularly formed by arranging a plurality of arcuate magnet elements in the circumferential direction, or the like. can.
- the permanent magnets 22 , 22 are arranged side by side along the axial direction on the inner peripheral surface side of the outer cylinder 23 .
- the axially adjacent permanent magnets 22, 22 have polarities opposite to each other. For example, next to a permanent magnet with an N pole on the inner peripheral side and an S pole on the outer peripheral side, a permanent magnet with an S pole on the inner peripheral side and an N pole on the outer peripheral side is arranged.
- the number of permanent magnets 22, 22 is not limited to the illustrated example. For example, the required number of permanent magnets 22, 22 can be arranged according to the stroke amount.
- the electromagnetic actuator 1 constitutes an electromagnetic suspension system for a vehicle together with a spring (not shown).
- the electromagnetic suspension device can be interposed vertically (as an inverted type) between a sprung member (on the vehicle body side) and an unsprung member (on the wheel side) of a vehicle, for example.
- force acts on the electromagnetic suspension device in the stroke direction (axial direction).
- the stator 2 and mover 21 of the electromagnetic actuator 1 move relative to each other according to this force.
- the electromagnetic actuator 1 applies a predetermined current to the coils 15A, 15B, and 15C according to the magnetic pole positions of the coils 15A, 15B, and 15C and the permanent magnets 22, 22, thereby generating thrust (damping force) of the electromagnetic actuator 1. ) can be adjusted. As a result, the ride comfort and steering stability of the vehicle can be improved.
- the inner cylinder 3 through which the rod 24 strokes preferably has a sealed structure in order to prevent water from being mixed into the oil due to condensation.
- the pressure inside the inner cylinder 3 that is, the pressure in the space marked with "A" in FIG. Therefore, for example, if the rod 24 is assembled in the maximum extension state (that is, if the inner cylinder 3 is sealed in the maximum extension state), a large reaction force acts on the rod 24 when the mover 21 (rod 24) contracts. (air reaction force) is added. As a result, the thrust may be biased between the extension stroke and the retraction stroke of the electromagnetic actuator 1 .
- the stator 2 strokes in the outer cylinder 23, so that the pressure in the outer cylinder 23, that is, the pressure in the space indicated by "B" in FIG. 1 changes. . Therefore, for example, when the stator 2 and the mover 21 are assembled in the maximum extension state (that is, when the outer cylinder 23 is closed in the maximum extension state), the stator 2 and the mover 21 contract. A large reaction force (air reaction force) is applied to the stator 2 and the mover 21. As a result, the thrust may be biased between the extension stroke and the retraction stroke of the electromagnetic actuator 1 .
- the rod 24 is assembled, that is, the inner cylinder 3 is sealed with an intermediate length (a length other than the maximum length and the minimum length).
- a bolt 11 for sealing the inner cylinder 3 is provided in order to improve the degree of freedom of the length (stroke) when sealing the inner cylinder 3 .
- the assembly of the outer cylinder 23, that is, the sealing of the outer cylinder 23 is performed at an intermediate length (a length other than the maximum length and the minimum length).
- bolts 28 for sealing the outer cylinder 23 are provided in order to improve the degree of freedom of the length (stroke) when sealing the outer cylinder 23 .
- a configuration for suppressing bias of the thrust force of the electromagnetic actuator 1 will be described in detail below.
- the electromagnetic actuator 1 is provided between two members that relatively move (for example, between an unsprung member and a sprung member of a vehicle).
- the electromagnetic actuator 1 includes a mover 21 as a first member attached to one of the two members (eg, unsprung member) and a fixed member as a second member attached to the other of the two members (eg, sprung member). has two children.
- the electromagnetic actuator 1 has a coil member 15 (coils 15A, 15B, 15C) and permanent magnets 22, 22 as power means for moving the mover 21 and the stator 2 relative to each other.
- the mover 21 has an outer cylinder 23 and a lower member 25 as a first cylinder, and a rod 24 .
- the first cylinder is provided with a lower member 25 serving as a bottom at one end (lower end). That is, the bottom of the first cylinder is formed of a lower member 25 as a first end member that can be attached to and detached from the outer cylinder 23 .
- the other end (upper end) of the first cylinder is open.
- the rod 24 extends from the bottom (lower member 25) in the first cylinder toward the other open end (upper end).
- a piston 29 is attached to the rod 24 . That is, the rod 24 has a piston 29 on the tip side.
- the stator 2 has an inner cylinder 3 and a bottom member 6 as a second cylinder, and a closing member 7.
- a rod 24 is inserted into the second cylinder.
- the second cylinder slides on the outer circumference of the rod 24 and is closed at one end (lower end).
- the inner cylinder 3 slides on the outer circumference of the piston 29 provided on the rod 24 . That is, the rod 24 is fixed with a piston 29 that slides on the inner circumference of the inner cylinder 3 and that has a communication passage 29A that divides the inner cylinder 3 into two chambers and communicates the two chambers.
- One end (lower end) of the inner cylinder 3 is closed by a bottom member 6 .
- one end (lower end) of the second cylinder is formed of the detachable bottom member 6 .
- the through hole 6D of the bottom member 6 slides on the outer circumference of the rod 24 via a sliding member.
- the closing member 7 is provided at the other end (upper end) of the second cylinder.
- Air is sealed in the second cylinder (the inner cylinder 3 and the bottom member 6) as the first fluid whose volume changes with pressure. Further, in the second cylinder (the inner cylinder 3 and the bottom member 6), a lubricant (for example, lubricating oil shown only in FIG. 30) is enclosed. As the lubricant, various lubricants such as grease can be used in addition to the lubricating oil 30 .
- the closing member 7 is provided with a through hole 7F as a communication hole that communicates the inside of the second cylinder (the inner cylinder 3 and the bottom member 6) with the outside.
- the closing member 7 has a bolt 11 as a plug member that can arbitrarily open and close the through hole 7F.
- the pressure in the second cylinder (the inner cylinder 3 and the bottom member 6), that is, the pressure in the space labeled "A" in FIG.
- the pressure in the air chamber inside the inner cylinder 3 is positive at the minimum length and negative at the maximum length.
- the first cylinder (the outer cylinder 23 and the lower member 25) is also filled with air as the first fluid whose volume changes due to pressure.
- the lower member 25 (disk portion 25A) as the first end member is provided with a through hole 25C as a second communication hole that communicates the inside of the first cylinder (the outer cylinder 23 and the lower member 25) with the outside. ing.
- the lower member 25 has a bolt 28 as a second plug member that can arbitrarily open and close the through hole 25C.
- the pressure in the first cylinder (the outer cylinder 23 and the lower member 25), that is, the pressure in the space labeled "B" in FIG.
- the pressure becomes higher than the atmospheric pressure when the minimum length becomes , and becomes lower than the atmospheric pressure when the relative position of the mover 21 and the stator 2 becomes maximum. That is, the pressure in the air chamber inside the outer cylinder 23 is positive at the minimum length and negative at the maximum length.
- FIGS. 4 to 7 show the assembly steps (1) to (9) of the electromagnetic actuator 1 in order. 4 and 5 omit illustration of the outer cylinder 23, the upper member 10, etc., which are assembled in the later steps. 5(6) and 6(6) differ in that the outer cylinder 23, the upper member 10, etc. are omitted or shown.
- (1) of FIG. 4 shows a state in which part of the stator 2 and part of the mover 21 are disassembled.
- steps (1) to (2) of FIG. 4 the bottom member 6 is inserted into the rod 24 of the "rod assembly" to which the lower member 25 and the rod 24 are fixed.
- steps (2) to (3) in FIG. 4 attach the piston 29 to the tip of the rod 24 .
- the piston 29 is attached to the rod 24 after the bottom member 6 is inserted into the rod 24 .
- the "second cylinder assembly" composed of the inner cylinder 3 and the armature 13 (the core member 14 and the coil member 15) is inserted into the rod 24.
- the inner cylinder 3 and the bottom member 6 are screwed. That is, in steps (3) of FIG. 4 to (4) of FIG. 5, the rod 24 is inserted into the inner cylinder 3 .
- the inner cylinder 3 and the bottom member 6 are fixed by screwing the female threaded portion 3A of the inner cylinder 3 and the male threaded portion 6C of the bottom member 6 together.
- the inner cylinder 3 and the armature 13 of the "second cylinder assembly” are not fixed.
- the “second cylinder assembly” may be composed of the inner cylinder 3 , the armature 13 and the annular member 12 . That is, a “second cylinder assembly” composed of the inner cylinder 3 , the armature 13 and the annular member 12 may be inserted into the rod 24 .
- the armature 13 and the annular member 12 may be inserted into the rod 24 in order after the inner cylinder 3 is inserted into the rod 24 and the inner cylinder 3 and the bottom member 6 are screwed together. In any case, the bottom member 6 is inserted into the rod 24 before inserting the rod 24 into the inner cylinder 3 .
- the closing member 7 is attached to the inner cylinder 3. That is, the small diameter portion 7A of the closing member 7 is inserted into the inner cylinder 3 and screwed.
- the inner cylinder 3 and the closing member 7 are fixed by screwing the female threaded portion 3B of the inner cylinder 3 and the male threaded portion 7D of the closing member 7 together.
- Lubricating oil 30 (see FIG. 2) is put in the inner cylinder 3 as a second fluid.
- the step of putting the lubricating oil 30 into the inner cylinder 3 is performed before fixing the closing member 7 to the inner cylinder 3 . That is, the lubricating oil 30 is applied before the state of (5) in FIG.
- the inner cylinder 3 when using a material with high viscosity and low fluidity for the lubricating oil 30, such as grease, it may be put into the inner cylinder 3 before inserting the rod 24 into the inner cylinder 3, or The inner cylinder 3 may be inserted after the cylinder 3 and the bottom member 6 are fixed.
- a material with high viscosity and low fluidity for the lubricating oil 30, such as grease it may be put into the inner cylinder 3 before inserting the rod 24 into the inner cylinder 3, or The inner cylinder 3 may be inserted after the cylinder 3 and the bottom member 6 are fixed.
- the lubricating oil 30 when using a material with high viscosity and low fluidity for the lubricating oil 30, such as grease, before inserting the rod 24 into the inner cylinder 3 and after fixing the inner cylinder 3 and the bottom member 6 You may put the lubricating oil 30 in the inner cylinder 3 by both. For example, by putting lubricating oil 30 into the inner cylinder 3 before fixing the inner cylinder 3 and the bottom member 6, the sliding resistance between the piston 29 and the inner cylinder 3 when inserting the rod 24 into the inner cylinder 3 is reduced. can be made smaller. Also, by putting the lubricating oil 30 after the inner cylinder 3 and the bottom member 6 are fixed, the lubricating oil 30 can be prevented from leaking from the inner cylinder 3 .
- a material with high viscosity and low fluidity for the lubricating oil 30, such as grease You may put the lubricating oil 30 in the inner cylinder 3 by both. For example, by putting lubricating oil 30 into the inner cylinder 3 before fixing the
- the amount of lubricating oil 30 is an amount that can prevent damage to the inner cylinder 3 when the inner cylinder 3 is at its minimum length and the rod 24 is no longer stroked (locked) due to an increase in the internal pressure of the inner cylinder 3 .
- the amount of lubricating oil 30 is the volume of the inner cylinder 3 at the minimum length (the volume of the inner cylinder 3 - the volume of the rod 24 inserted into the inner cylinder 3 - the volume of the piston 29). lesser amount than For example, as shown in FIG. 2, the lubricating oil 30 may be injected to such an extent that the end of the rod 24 or the entire piston 29 is immersed in the lubricating oil 30 at the maximum length in order to maintain lubricity. preferable.
- Steps (5) to (6) in FIG. 5 attach the intermediate cylinder 5 to the closing member 7 . That is, the closing member 7 is inserted into the intermediate tube 5 and screwed. In this case, as shown in (6) of FIG. 5 and (6) of FIG. 7 is fixed. At this time, the annular member 12 and the armature 13 are sandwiched between the intermediate cylinder 5 and the bottom member 6 and fixed in axial position. Steps (6) to (7) in FIG. 6 connect the outer cylinder 23 and the lower member 25 . That is, the assembly shown in FIG. 5(6) is inserted into the outer cylinder 23, and the outer cylinder 23 and the lower member 25 are bolted. Specifically, the outer cylinder 23 and the lower member 25 are fixed by screwing the bolt 27 into the screw hole 23A of the outer cylinder 23 while the lower end of the outer cylinder 23 is in contact with the lower member 25 .
- the relative position between the mover 21 and the stator 2 is at a position other than the maximum length and the minimum length, for example, halfway between the maximum length and the minimum length.
- the through hole 7F and the through hole 25C are closed in a state of (substantially half) the length. That is, the relative positions of the mover 21 and the stator 2 are extended from the state of (7) in FIG. 6 to the state of (8) in FIG. Then, with the relative positions of the mover 21 and the stator 2 in the state of (8) in FIG. .
- a bolt 28 serving as a plug member is screwed into the through hole 25C of the lower member 25 to seal the inside of the outer cylinder 23 .
- the maximum length is, for example, the state in which the lower surface of the piston 29 is in contact with a step provided on the inner peripheral surface of the lower end of the inner cylinder 3 (or the upper surface of the small diameter portion 6A of the bottom member 6) (Fig. 2).
- the minimum length corresponds to, for example, a state in which the lower surface of the bottom member 6 is in contact with the upper surface of the lower member 25 (disk portion 25A).
- the intermediate length for sealing the inner cylinder 3 and/or the intermediate length for sealing the outer cylinder 23 may be other than the maximum length and the minimum length.
- the intermediate length can be half (approximately half) the length between the maximum length and the minimum length.
- the intermediate length is not limited to this, and the intermediate length may be shifted from half (approximately half) between the maximum length and the minimum length.
- the intermediate length can be set, for example, between the maximum length and the minimum length so that the reaction force (thrust force) in the extension stroke and contraction stroke is within a desired range.
- the intermediate length when sealing the inside of the inner cylinder 3 and the intermediate length when sealing the inside of the outer cylinder 23 may be different.
- the upper member 10 is bolted to the closing member 7. That is, the upper member 10 (disc portion 10B) and the closing member 7 (large diameter portion 7B) are placed in contact with the upper surface of the closing member 7 (large diameter portion 7B). ) are fixed with bolts 9.
- the assembly process (manufacturing process) of the embodiment has the following steps (A), (B), (C), (D), and (E).
- (A) A step of inserting the rod 24 into the second cylinder (inner cylinder 3, bottom member 6). That is, steps (1) to (2) in FIG. 4 and steps (3) to (4) in FIG.
- (B) The closing member 7 is fixed to the other end (upper end) of the inner cylinder 3, and the position (maximum A step of closing the inner cylinder 3 by introducing air as the first fluid whose volume is changed by pressure into the inner cylinder 3 at a position other than the length and the minimum length). That is, steps (4) to (5) in FIG. 5 and steps (7) to (8) in FIG. 6 .
- (C) A step of introducing lubricating oil 30 as a second fluid having compressibility different from that of air into the inner cylinder 3 before fixing the closing member 7 . That is, the step of filling the lubricating oil 30 into the inner cylinder 3 in any one of the states shown in FIGS. 4(1) to 5(4).
- the lubricating oil 30 can be added in at least one of (1) to (4) in FIG. 4 .
- the lubricating oil 30 has low viscosity and high fluidity, it can be inserted at (4) in FIG.
- steps (1) to (2) in FIG. (E) A step of mounting the piston 29 on the rod 24 after inserting the bottom member 6 onto the rod 24 . That is, steps (2) to (3) in FIG.
- the assembly process (manufacturing process) of the embodiment has the following process (F).
- (F) The lower member 25 is fixed to one end (lower end) of the outer cylinder 23, and the position other than the maximum length at which the relative position of the mover 21 and the stator 2 is maximized and the minimum length at which it is minimized (other than the maximum length, and at a position other than the minimum length), the outer cylinder 23 is closed by introducing air as a first fluid whose volume changes with pressure. That is, steps (6) to (7) in FIG. 6 and steps (7) to (8) in FIG.
- the closing member 7 is fixed to the other end (upper end) of the inner cylinder 3, and the relative position between the mover 21 and the stator 2 is "a length other than the maximum length and a length other than the minimum length.” position”, air is introduced into the inner cylinder 3 to close the air chamber of the inner cylinder 3 (the space denoted by “A” in FIGS. 1 and 7). Therefore, assuming that the axial position of the rod 24 when the inner cylinder 3 is closed is the intermediate length (closed position) and the pressure inside the inner cylinder 3 at that time is atmospheric pressure (closed pressure), the pressure inside the inner cylinder 3 is The pressure increases above atmospheric pressure as the rod 24 is displaced from the intermediate length (closed position) to the retracted side. Further, the pressure in the inner cylinder 3 becomes lower than the atmospheric pressure as the rod 24 is displaced from the intermediate length (closed position) to the extension side.
- the pressure in the inner cylinder 3 (the pressure in the space labeled "A" in FIGS. 1 and 7) "simply increases” or “simply decreases” with respect to the atmospheric pressure as the rod 24 is displaced. It “increases and decreases” with respect to atmospheric pressure, rather than relative to atmospheric pressure. Therefore, for example, the reaction force (air reaction force applied to the rod 24) based on the pressure of the gas (air) in the inner cylinder 3 can be reduced compared to the case where the inner cylinder 3 is closed with the maximum length. As a result, it is possible to reduce the unevenness of the reaction force and, by extension, the unevenness of the thrust of the electromagnetic actuator 1 .
- the lower member 25 is fixed to one end (lower end) of the outer cylinder 23, and the outer cylinder 23 Air is introduced to block the air chamber of the outer cylinder 23 (the space indicated by "B" in FIGS. 1 and 7). Therefore, assuming that the relative position when the outer cylinder 23 is closed is the intermediate length (closed position) and the pressure inside the outer cylinder 23 at that time is atmospheric pressure (closed pressure), the pressure inside the outer cylinder 23 is the movable As the element 21 and the stator 2 are relatively displaced from the intermediate length (closed position) to the contraction side, the pressure becomes higher than the atmospheric pressure. Further, the pressure inside the outer cylinder 23 becomes lower than the atmospheric pressure as the mover 21 and the stator 2 are displaced from the intermediate length (closed position) to the extension side.
- the pressure in the outer cylinder 23 (the pressure in the space indicated by "B" in FIGS. 1 and 7) "simply increases” with respect to the atmospheric pressure as the mover 21 and the stator 2 move relative to each other. or “simply decrease", but “increase and decrease” relative to atmospheric pressure. Therefore, for example, compared to the case where the outer cylinder 23 is closed with the maximum length, the reaction force (air reaction force applied to the mover 21 and the stator 2) based on the gas (air) pressure in the outer cylinder 23 can be reduced. As a result, from this aspect as well, it is possible to reduce the unevenness of the reaction force and, by extension, the unevenness of the thrust of the electromagnetic actuator 1 .
- lubricating oil 30 is put into the inner cylinder 3 before fixing the closing member 7 to the inner cylinder 3 . Therefore, not only air but also lubricating oil 30 can be put into the inner cylinder 3 . That is, the lubricating oil 30 can be enclosed in the inner cylinder 3 . As a result, sliding resistance between the inner cylinder 3 and the rod 24 can be reduced, and wear due to sliding can be suppressed.
- the rod 24 before inserting the rod 24 into the inner cylinder 3 , the bottom member 6 is inserted into the rod 24 and then the piston 29 is attached to the rod 24 . Therefore, the rod 24 can be mounted with the piston 29 having an outer diameter larger than the inner diameter of the bottom member 6 (in other words, the outer diameter of the rod 24). In this case, by making the outer diameter of the piston 29 large enough to slide on the inner circumference of the inner cylinder 3, when a lateral force is applied between the mover 21 and the stator 2, the piston 29 It is possible to prevent the mover 21 and the stator 2 from moving in a bending direction.
- the pressure inside the inner cylinder 3 is higher than the atmospheric pressure at the minimum length and lower than the atmospheric pressure at the maximum length. That is, the pressure in the inner cylinder 3 does not “simply increase” or “simply decrease” with respect to the atmospheric pressure as the rod 24 is displaced, but rather “increases and decreases” with respect to the atmospheric pressure. For this reason, for example, compared to the case where the pressure in the inner cylinder 3 reaches the atmospheric pressure at the maximum length, the reaction force based on the pressure of the gas (air) in the inner cylinder 3 (air reaction force applied to the rod 24) can be reduced. As a result, it is possible to reduce the unevenness of the reaction force and, by extension, the unevenness of the thrust of the electromagnetic actuator 1 .
- the pressure inside the outer cylinder 23 is higher than the atmospheric pressure at the minimum length and lower than the atmospheric pressure at the maximum length. That is, the pressure in the outer cylinder 23 does not “simply increase” or “simply decrease” with respect to the atmospheric pressure as the relative displacement between the mover 21 and the stator 2, but rather “increases” with respect to the atmospheric pressure. and decrease. For this reason, for example, compared to the case where the pressure in the outer cylinder 23 reaches the atmospheric pressure at the maximum length, the reaction force based on the pressure of the gas (air) in the outer cylinder 23 (the force acting on the mover 21 and the stator 2 applied air reaction force) can be reduced. As a result, from this aspect as well, it is possible to reduce the unevenness of the reaction force and, by extension, the unevenness of the thrust of the electromagnetic actuator 1 .
- a piston 29 is fixed to the rod 24 and slides on the inner periphery of the inner cylinder 3.
- the piston 29 has a communication passage 29A that communicates the two chambers in the inner cylinder 3. . Therefore, when a lateral force is applied between the mover 21 and the stator 2 , the piston 29 can prevent the mover 21 and the stator 2 from moving in a bending direction. Moreover, since the two chambers in the inner cylinder 3 are communicated with each other by the communication passage 29A of the piston 29, it is possible to suppress the pressure difference between the two chambers in the inner cylinder 3 from increasing. As a result, from this aspect as well, it is possible to reduce bias in the reaction force, and by extension, bias in the thrust of the electromagnetic actuator 1 .
- the closing member 7 has a through hole 7F that communicates the inside of the inner cylinder 3 with the outside, and a bolt 11 that can arbitrarily open and close the through hole 7F. Therefore, the inner cylinder 3 can be closed while the relative position between the mover 21 and the stator 2 (that is, the axial position of the rod 24) is set at a desired position. For example, when the through hole 7F is open, the relative position between the mover 21 and the stator 2 (that is, the axial position of the rod 24) is set to an intermediate length (desired length). Close hole 7F. As a result, the inner cylinder 3 can be closed at the atmospheric pressure with an intermediate length (desired length).
- the lower member 25 (disc portion 25A) has a through hole 25C that communicates the inside of the outer cylinder 23 with the outside, and a bolt 28 that can arbitrarily open and close the through hole 25C. Therefore, the outer cylinder 23 can be closed while the relative position between the mover 21 and the stator 2 is set to a desired position. For example, with the through hole 25C open, the relative position between the mover 21 and the stator 2 is set to an intermediate length (desired length), and the through hole 25C is closed with the bolt 28 in this state. As a result, the outer cylinder 23 can be closed at atmospheric pressure with an intermediate length (desired length). In this case, this work can be easily performed by opening and closing the through hole 25C with the bolt 28. FIG. Therefore, in addition to being able to improve workability when closing the outer cylinder 23, the degree of freedom of the relative position between the mover 21 and the stator 2 when closing the outer cylinder 23 can be improved.
- FIG. 8 shows a second embodiment.
- a feature of the second embodiment is that the relative positions of the first member and the second member are different from the maximum length and the minimum length before the outer cylinder of the first cylinder and the first end member are connected (fixed). The second cylinder is closed by introducing air into the second cylinder at the position.
- symbol is attached
- step 8 after fixing the outer cylinder 23 and the lower member 25 with the bolts 27 in steps (6) to (7) of FIG. 6, (7) to (7) of FIG. In step 8), the relative position between the mover 21 and the stator 2 is set to an intermediate length, and the through holes 7F and 25C are closed.
- the process proceeds from (6) in FIG. 5 to (7) in FIG. That is, in the second embodiment, before the outer cylinder 23 and the lower member 31 are fixed with the bolts 27, the relative position between the mover 21 and the stator 2 is set to the intermediate length, and the through hole 7F is closed. Also, in the second embodiment, the lower member 31 does not have the through holes 25C and the bolts 28 like the lower member 25 of the first embodiment.
- the lower member 31 corresponding to the bottom portion (first end member) of the first cylinder has the disk portion 31A and the mounting eye 31C.
- the disk portion 31A is provided with a bolt insertion hole 31B through which a bolt 27 for fixing the lower member 31 and the outer cylinder 23 is inserted. 2 communicating holes) are not provided.
- the lower member 25 of the first embodiment may also be used in the second embodiment. That is, the lower member 25 having the through holes 25C and the bolts 28 may also be used in the second embodiment.
- FIG. 8 shows the assembly process from (7) as the assembly process (manufacturing process) of the second embodiment.
- the steps (1) to (6) are the same as the steps (1) to (6) shown in FIGS. 4 and 5 of the first embodiment. 5(6) to 8(7), the relative position between the mover 21 and the stator 2 is at a position other than the maximum length and the minimum length, for example, halfway between the maximum length and the minimum length.
- the through-hole 7F is closed in a state of (approximately half) the length. That is, the relative positions of the mover 21 and the stator 2 are extended from the state of (6) in FIG. 5 to the state of (7) in FIG. Then, when the relative positions of the mover 21 and the stator 2 are in the state of (7) in FIG. .
- Steps (7) to (8) in FIG. 8 connect the outer cylinder 23 and the lower member 31 . That is, the assembly shown in FIG. 8(7) is inserted into the outer cylinder 23, and the outer cylinder 23 and the lower member 31 are bolted. Specifically, the outer cylinder 23 and the lower member 31 are fixed by screwing the bolt 27 into the screw hole 23A of the outer cylinder 23 while the lower end of the outer cylinder 23 is in contact with the lower member 31 . In steps (8) to (9) of FIG. 8, the upper member 10 is bolted to the closing member 7 with the bolts 9 .
- the second embodiment assembles the electromagnetic actuator 1 by the assembly process as described above, and its basic action is not particularly different from that of the first embodiment described above.
- the relative position between the mover 21 and the stator 2 is set to the intermediate length, and the through hole 7F is closed. Therefore, when the armature 13 (core member 14, coil member 15) and the permanent magnets 22, 22 are not closely opposed to each other when the movable element 21 and the stator 2 are of intermediate length, The work to be done can be done with a small force.
- the bolt 11 is used as the plug member for sealing the inner cylinder 3
- various plug members such as a pin member and an insertion plug can be used as long as they can seal the inside of the inner cylinder 3 .
- the case where the piston 29 is fixed (attached) to the rod 24, that is, the case where the outer circumference of the rod 24 slides on the inner cylinder 3 via the piston 29 is used.
- the piston may be omitted.
- the outer circumference of the rod may be slid only on the through hole of the bottom member, or the outer circumference of the rod may be slid on the inner circumference of the inner cylinder.
- the case where air is used as the first fluid to be introduced into the inner cylinder 3 and lubricating oil is used as the second fluid has been described as an example.
- a gas other than air such as nitrogen gas may be used as the first fluid
- a fluid other than liquid such as grease may be used as the second fluid.
- various fluids such as a mixture of gas (eg, air, nitrogen gas) and liquid (eg, lubricating oil) can be used other than gas. This also applies to the second fluid.
- the cylindrical linear electromagnetic actuator is composed of coils 15A, 15B, and 15C (coil member 15) provided on the core member 14 on the stator 2 side, and
- coil member 15 The description has been given by taking as an example the case where it is configured by the permanent magnets 22, 22 (magnetic members) provided on the outer cylinder 23 of the above.
- a cylindrical linear electromagnetic actuator may be configured by a coil (coil member) provided on the mover side and a permanent magnet (magnetic member) provided on the stator side. .
- the stator 2 is attached to the sprung member of the vehicle, and the mover 21 is attached to the unsprung member of the vehicle.
- the configuration is not limited to this, and for example, the stator may be attached to the unsprung member of the vehicle and the mover may be attached to the sprung member of the vehicle.
- the electromagnetic actuator 1 is mounted vertically on a vehicle such as a railroad vehicle or an automobile has been described as an example.
- the configuration may be such that the electromagnetic actuator is installed in a vehicle such as a railroad vehicle in a horizontal position.
- the electromagnetic actuator 1 is attached to the vehicle has been described as an example. It may be used as a shock absorber for machines, buildings, and the like.
- the electromagnetic actuator is not limited to shock absorbers, and can be used as an actuator device (driving device) for driving various devices.
- a linear motor with a circular cross-sectional shape that is, a case where the stator 2 and the mover 21 are formed in a cylindrical shape
- the present invention is not limited to this.
- it is composed of a cylindrical linear motor having a cross-sectional shape other than a circular shape, such as an I-shaped (flat plate-shaped), rectangular, or H-shaped linear motor having a cross-sectional shape.
- the electromagnetic actuator 1 configured as a linear motor has been described as an example of the actuator device.
- the configuration is not limited to this, and for example, a configuration in which an electric motor (rotating motor) drives a rod of a ball screw mechanism (rotation/linear motion conversion mechanism) may be adopted as the actuator device.
- the power means of the actuator device is not limited to the electric linear motor in which the coils 15A, 15B, 15C and the permanent magnets 22, 22 are arranged in the axial direction, but is composed of an electric motor (rotating motor) and a rotation/linear motion conversion mechanism. etc., various power means can be employed.
- the closing member is fixed to the other end of the second cylinder, and when the relative positions of the first member and the second member are other than the maximum length and the minimum length, the closing member is inserted into the second cylinder.
- the first fluid is introduced and the second cylinder is closed. Therefore, if the axial position of the rod when the second cylinder is closed is defined as the "closed position" and the pressure in the second cylinder at that time is defined as the "closed pressure", then the pressure in the second cylinder is The occlusion pressure increases with displacement from the occlusion position to the contraction side. Also, the pressure in the second cylinder decreases from the closing pressure as the rod is displaced from the closed position to the extension side.
- the pressure in the second cylinder "increases and decreases” with respect to the closing pressure, rather than “just increasing” or “just decreasing” with respect to the closing pressure as the rod is displaced.
- the second cylinder is closed by atmospheric pressure when the position of the rod is half (approximately half) between the maximum length and the minimum length.
- the pressure in the second cylinder becomes higher than the atmospheric pressure as the rod is displaced from the half length toward the contraction side, and becomes higher than the atmospheric pressure as the rod is displaced from the half length toward the extension side. lower than atmospheric pressure.
- the reaction force air reaction force applied to the rod
- the pressure of the first fluid in the second cylinder can be reduced compared to the case where the second cylinder is closed with the maximum length.
- the second fluid is introduced into the second cylinder before fixing the closure member. Therefore, not only the first fluid but also the second fluid can be put into the second cylinder.
- a lubricant for example, oil or grease
- the sliding resistance between the second cylinder and the rod can be reduced, and wear due to sliding can be suppressed.
- the bottom member before inserting the rod into the second cylinder, the bottom member is inserted into the rod and then the rod is fitted with the piston. Therefore, a piston having an outer diameter larger than the inner diameter of the bottom member (in other words, the outer diameter of the rod) can be attached to the rod.
- the piston for example, by setting the outer diameter of the piston to be slidable on the inner circumference of the second cylinder, when a lateral force is applied between the first member and the second member, the piston It is possible to prevent the first member and the second member from moving in a bending direction.
- the pressure in the second cylinder is higher than the atmospheric pressure at the minimum length and lower than the atmospheric pressure at the maximum length. That is, the pressure in the second cylinder "increases and decreases” with respect to atmospheric pressure, rather than “simply increasing” or “simply decreasing” with respect to atmospheric pressure as the rod is displaced. Therefore, for example, the reaction force (air reaction force applied to the rod) based on the pressure of the first fluid in the second cylinder is reduced compared to the case where the pressure in the second cylinder reaches the atmospheric pressure at the maximum length. can. As a result, it is possible to reduce the unevenness of the reaction force and, by extension, the unevenness of the thrust force of the actuator device.
- a piston that slides on the inner periphery of the second cylinder is fixed to the rod, and the piston has a communication passage that communicates two chambers in the second cylinder. Therefore, when a lateral force is applied between the first member and the second member, it is possible to prevent the piston from moving the first member and the second member in a bending direction. Moreover, since the two chambers in the second cylinder are communicated with each other through the communication passage of the piston, it is possible to suppress an increase in pressure difference between the two chambers in the second cylinder. As a result, from this aspect as well, it is possible to reduce the unevenness of the reaction force, and by extension, the unevenness of the thrust force of the actuator device.
- the second fluid is sealed inside the second cylinder. Therefore, by enclosing a lubricant (for example, oil or grease) as the second fluid, the sliding resistance between the second cylinder and the rod can be reduced, and the abrasion due to sliding can be suppressed.
- a lubricant for example, oil or grease
- the closing member has a communication hole that communicates the inside of the second cylinder with the outside, and a plug member that can arbitrarily open and close the communication hole. Therefore, the second cylinder can be closed while the relative position between the first member and the second member (that is, the axial position of the rod) is set to a desired position. For example, when the communication hole is open, the relative position between the first member and the second member (that is, the axial position of the rod) is set to an intermediate length (desired length), and in this state, the communication hole is closed by the plug member. close up. As a result, the second cylinder can be closed at atmospheric pressure with an intermediate length (desired length).
- this work can be easily performed by opening and closing the communication hole with a plug member. Therefore, in addition to being able to improve the workability when closing the second cylinder, the degree of freedom of the relative position of the first member and the second member (that is, the axial position of the rod) when closing the second cylinder can be improved.
- the present invention is not limited to the above-described embodiments, and includes various modifications.
- the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described.
- part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.
- Electromagnetic actuator (actuator device) 2 Stator (2nd member) 3 Inner cylinder (2nd cylinder) 6 Bottom member (one end of 2nd cylinder) 7 Closing member 7F Through hole (communication hole) 11
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Abstract
Description
Claims (7)
- アクチュエータ装置の製造方法であって、
前記アクチュエータ装置は、相対移動する2部材間に設けられており、
また、前記アクチュエータ装置は、前記2部材の一方に取付けられる第1部材および前記2部材の他方に取付けられる第2部材、を有しており、
前記第1部材は、
一端に底部が設けられ、他端が開口する第1シリンダと、
前記第1シリンダ内の底部から開口する他端側に向けて延びるロッドと、
を有し、
前記第2部材は、
前記ロッドが挿入され、該ロッドの外周と摺動すると共に一端が閉塞される第2シリンダと、
前記第2シリンダの他端に設けられる閉塞部材と、
を有し、
前記アクチュエータ装置の製造方法は、
前記ロッドを前記第2シリンダ内に挿入する工程と、
前記第2シリンダの他端部に前記閉塞部材を固定し、前記第1部材と前記第2部材との相対位置が最大になる最大長および最小になる最小長以外の位置において、前記第2シリンダ内に圧力により体積が変化する第1流体を入れて閉塞される工程と、
を有しているアクチュエータ装置の製造方法。 - 請求項1に記載のアクチュエータ装置の製造方法において、
さらに、前記閉塞部材を固定する前に、前記第2シリンダ内に前記第1流体とは圧力による圧縮性の異なる第2流体を入れる工程、
を有しているアクチュエータ装置の製造方法。 - 請求項1または2に記載のアクチュエータ装置の製造方法において、
前記アクチュエータ装置は、前記ロッドに装着されるピストンを有し、
前記第2シリンダの一端は、着脱可能な底部部材で形成され、
アクチュエータ装置の製造方法は、さらに、
前記第2シリンダ内に前記ロッドを挿入する前に、前記ロッドに前記底部部材を挿入する工程と、
前記ロッドに前記底部部材を挿入後、前記ロッドに前記ピストンを装着する工程と、を有しているアクチュエータ装置の製造方法。 - アクチュエータ装置であって、
前記アクチュエータ装置は、相対移動する2部材間に設けられており、
また、前記アクチュエータ装置は、
前記2部材の一方に取付けられる第1部材および前記2部材の他方に取付けられる第2部材と、
前記第1部材と前記第2部材とが相対移動するよう動作する動力手段と、
を有しており、
前記第1部材は、
一端に底部が設けられ、他端が開口する第1シリンダと、
前記第1シリンダ内の底部から開口する他端側に延びるロッドと、
を有し、
前記第2部材は、
前記ロッドが挿入され、該ロッドの外周と摺動すると共に一端が閉塞される第2シリンダと、
前記第2シリンダの他端に設けられる閉塞部材と、
を有し、
前記第2シリンダ内には、圧力により体積が変化する第1流体が封入されており、
前記第2シリンダ内の圧力は、前記ロッドが該第2シリンダ内に最大まで挿入される最小長時に、大気圧よりも高くなり、前記ロッドが該第2シリンダ内から最大まで排出された最大長時に、大気圧よりも低くなることを特徴とするアクチュエータ装置。 - 請求項4に記載のアクチュエータ装置において、
前記ロッドには、前記第2シリンダの内周と摺動し、該第2シリンダ内を2室に区画すると共に該2室を連通する連通路を備えるピストンが固定されているアクチュエータ装置。 - 請求項4または5に記載のアクチュエータ装置において、
前記第2シリンダ内には、前記第1流体とは、圧力による圧縮性が異なる第2流体が封入されているアクチュエータ装置。 - 請求項4乃至6のいずれか1項に記載のアクチュエータ装置において、
前記閉塞部材には、前記第2シリンダ内と外部とを連通する連通孔が設けられており、
前記閉塞部材は、前記連通孔を任意に開閉可能な栓部材、を有するアクチュエータ装置。
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CN117662655A (zh) * | 2023-08-24 | 2024-03-08 | 比亚迪股份有限公司 | 电磁减振装置及车辆 |
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