JP2004124992A - Electromagnetic damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the durability of an electromagnetic damper by improving lubricity at a sliding part. <P>SOLUTION: An inner yoke 3 having a plurality of permanent magnets 6 and a guide pipe 7 fixed to the outside peripheral part thereof is inserted into an outer yoke 2 having a plurality of coils 4 fixed to the inside peripheral part thereof. These yokes are guided so as to slide each other by means of bearings 9 fixed to the outer yoke 2. The damping force is controlled by controlling the induced current induced in the coils 4 by the relative displacement between the coils 4 and the permanent magnets 6. The durability of the electromagnetic damper can be improved by improving the lubricity at the sliding part by supplying lubricant to the sliding part of the metal 9A of the bearing 9 by enclosing the lubricant within the grease chamber 5, which is provided between the coils 4 at the middle portion, and the gap 8 between the coil 4 and the guide pipe 7. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
[Industrial applications]
The present invention relates to an electromagnetic damper that is mounted on a vehicle such as an automobile or a railway vehicle, and other structures, buildings, and the like, and controls vibration by an electromagnetic force.
[0002]
[Prior art]
The electromagnetic damper controls the damping force by controlling the induced current generated in the coil due to the relative displacement between the magnet and the coil. Further, the electromagnetic damper can generate a thrust by flowing a coil current. (For example, see Patent Document 1).
[0003]
[Patent Document 1]
JP 2001-280416 A
[0004]
In an electromagnetic damper, the damping force is almost proportional to the magnitude of the current flowing through the coil.Therefore, the damping force can be easily controlled by controlling the current flowing through the coil by means of a variable resistor or on-off duty control of the circuit. Can be adjusted. Thus, a so-called semi-active damper that performs body posture control by controlling the damping force and stroke of the electromagnetic damper in real time based on parameters representing the running state such as the vehicle speed and acceleration using various sensors and controllers. Control can be performed relatively easily. At this time, since there is no need to supply power to the electromagnetic damper, power consumption can be suppressed.
[0005]
In addition, since a propulsive force is obtained by supplying electric power to the coil of the electromagnetic damper, the electromagnetic damper can be operated as an actuator (motor), thereby actively controlling the posture of the vehicle body. Control can also be performed.
[0006]
[Problems to be solved by the invention]
However, the conventional electromagnetic damper has the following problems. In a conventional electromagnetic damper, the sliding portion of a member that is relatively displaced by a coil and a magnet attached thereto is supported by an oil-free dry metal, and is used in a severe operating environment such as a railway vehicle or a vehicle suspension device. In such a case, it is difficult to obtain sufficient durability with an unlubricated dry metal. Further, since the sliding portion is exposed to a high temperature due to heat generated by the coil due to the operation of the electromagnetic damper, deterioration of the dry metal due to the heat becomes a problem.
[0007]
In addition, since the coil of the electromagnetic damper generates heat by its operation, if a large output is continuously generated for a long time, the coil portion is likely to be overheated. However, a large heat sink or the like cannot be provided due to a limitation of a mounting space or the like, and it is difficult to obtain sufficient heat dissipation.
[0008]
The present invention has been made in view of the above points, and an object of the present invention is to provide an electromagnetic damper capable of improving the durability of a sliding portion and improving the heat dissipation of a coil.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 provides a magnet-side member to which a magnet is attached and a coil-side member to which a coil is attached so as to be relatively displaceable. In an electromagnetic damper that controls a current flowing through the coil with respect to displacement to generate a damping force or a thrust,
A lubricant supply means for supplying a lubricant to a bearing which supports the magnet side member and the coil side member so as to be displaceable from each other is provided.
With this configuration, a lubricant is supplied to the bearing to lubricate the bearing.
An electromagnetic damper according to a second aspect of the present invention is the electromagnetic damper according to the first aspect, wherein the lubricant supply means includes a lubricant sealed in a space formed between the magnet-side member and the coil-side member. Is supplied to the bearing.
With this configuration, the lubricant is supplied to the bearing from the space between the magnet-side member and the coil-side member.
According to a third aspect of the present invention, in the electromagnetic damper according to the first or second aspect, the coil is immersed in a lubricant of the lubricant supply unit.
With this configuration, heat of the coil is radiated through the lubricant.
An electromagnetic damper according to a fourth aspect of the present invention is the electromagnetic damper according to any one of the first to third aspects, wherein the circulating means circulates the lubricant in the space by a relative displacement between the coil-side member and the magnet-side member. It is characterized by having.
With this configuration, the lubricant is circulated, and heat release from the coil by the lubricant is promoted.
According to a fifth aspect of the present invention, in the electromagnetic damper according to the fourth aspect, the circulating means includes a check valve for circulating the lubricant in one direction.
With this configuration, circulation of the lubricant is promoted by the check valve.
According to a sixth aspect of the present invention, in the electromagnetic damper according to any one of the first to fifth aspects, the lubricant supply unit supplies the lubricant to the bearing via an oil-impregnated cloth.
With this configuration, the supply amount of the lubricant can be adjusted by the oil-impregnated cloth.
An electromagnetic damper according to a seventh aspect of the present invention is the electromagnetic damper according to any one of the first to sixth aspects, wherein the bearing is provided with an oil seal for preventing leakage of a lubricant.
With this configuration, the oil seal prevents the lubricant from leaking from the bearing.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
A first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the electromagnetic damper 1 according to the present embodiment has a structure in which one end of an inner yoke 3 is inserted into a cylindrical outer yoke 2 and the other end of the inner yoke 3 extends to the outside. Has become.
[0011]
A plurality of coils 4 are arranged in series along the axial direction on the inner periphery of the outer yoke 2 (coil side member). These coils 4 are arranged over a predetermined range along the axial direction of the outer yoke 2, and a gap is provided between the two coils 4 arranged at the center, so that an annular grease is used as a lubricant supply unit. A reservoir 5 (space) is formed.
[0012]
A plurality of ring-shaped permanent magnets 6 are attached to an outer peripheral portion of the inner yoke 3 (magnet-side member), and a guide pipe 7 (magnet-side member) is fitted on the outer periphery of these permanent magnets 6. Cylindrical bearings 9 are attached to the inner periphery of the outer yoke 2 at both ends of the plurality of coils 4, and a guide pipe 7 is inserted through these bearings 9 and slidably supported. A predetermined gap 8 (space) is provided between the guide pipe 7 and the coil 4, and an outer peripheral surface of the permanent magnet 6 and an inner peripheral surface of the coil 4 have a certain gap therebetween through the guide pipe 7. They are opposed to each other.
[0013]
A magnetic circuit is formed by the outer yoke 2, the coil 4, the permanent magnet 6, and the inner yoke 3, and the coil 4 and the permanent magnet 6 are relatively displaced with the stroke of the inner yoke 3, so that an induced electromotive force is generated in the coil 4. Is to occur.
[0014]
A lubricant is sealed in the grease reservoir 5, and the lubricant is attached to the surface of the guide pipe 7, and the lubricant is applied to the sliding portion of the metal 9 </ b> A of the bearing 9 through the gap 8 between the coil 4 and the guide pipe 7. A lubricant is supplied. By providing oil seals outside the bearings 9 on both sides, the leakage of the lubricant from the bearings 9 may be surely prevented. As the lubricant, a solid lubricant such as thermally solidified grease, a semi-liquid lubricant or a liquid lubricant can be used. An oil inlet 11 having a check valve 10 is provided on a side wall of the outer yoke 2 to supply lubricant to the oil reservoir 5 from outside.
[0015]
Next, the operation of the present embodiment configured as described above will be described.
When the inner yoke 3 strokes, an induced electromotive force is generated in the coil 4 due to the relative displacement between the coil 4 and the permanent magnet 6. By applying a resistance to the current flowing through the coil 4 by the induced electromotive force, the inner yoke 3 is moved. A damping force can be applied to the third stroke. Thereby, for example, the damping force can be controlled by controlling the current flowing through the coil 4 by the variable resistor or by controlling the ON / OFF of the circuit by duty.
[0016]
In addition, by applying a current to the coil 4 in accordance with the relative position between the coil 4 and the permanent magnet 6, the electromagnetic damper 1 can be operated as an actuator (linear motor) to generate a thrust in the inner yoke 3. .
[0017]
In this case, for example, the permanent magnet 6 is disposed such that the surface on the coil 4 side is arranged such that the N pole and the S pole are alternately arranged along the stroke direction of the inner yoke 3. The three phases of U-phase, V-phase, and W-phase are arranged in a predetermined order along with the three-phase synchronous linear motor by detecting the relative position between the coil 4 and the permanent magnet 6 using a Hall element or the like. With the same principle, the electromagnetic damper 1 can be operated as a linear motor using a normal three-phase synchronous motor driving driver, and the thrust of the inner yoke 3 can be controlled.
[0018]
A lubricant can be supplied from the grease reservoir 5 to the sliding portion of the metal 9A of the bearing 9 by the stroke of the inner yoke 3, so that the oil film can be constantly maintained. Can be greatly reduced, and the durability can be greatly improved. In addition, since the lubricant can be appropriately replenished from the lubrication port 11, maintenance is excellent.
[0019]
In FIG. 1, two lubrication ports 11 are arranged in the diameter direction of the outer yoke 2. However, when the electromagnetic damper 1 is mounted in the illustrated direction (horizontal direction), lubrication is performed from the upper lubrication port 10. Since the lubricated lubricant flows to the lower portion of the grease reservoir 5 by gravity, the lower lubrication port 10 may be omitted. If it is not necessary to replenish the lubricant due to the use conditions of the electromagnetic damper 1 or the like, the lubrication port 11 may be omitted.
[0020]
Hereinafter, other embodiments of the present invention will be described. In these descriptions, portions similar to those described above are denoted by the same reference numerals, and only different portions will be described in detail.
[0021]
A second embodiment of the present invention will be described with reference to FIG. As shown in FIG. 2, in the electromagnetic damper 12 of the second embodiment, two grease reservoirs 5 are arranged between the coils 4 arranged near the bearings 9 at both ends.
[0022]
With this configuration, the lubricant can be easily supplied to the bearing 9, the amount of the filled lubricant can be increased, and the lubricity can be improved and the lubricant supply cycle can be extended.
[0023]
Next, a third embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 3 to 5, in the electromagnetic damper 13 according to the third embodiment, the inner yoke 3 is formed in a hollow cylindrical shape. A plurality of fan-shaped bobbins 14 are concentrically arranged at equal intervals between the coils 4 (see FIG. 5), and the outer periphery of each bobbin 14 is fitted to the inner periphery of the outer yoke 2. An annular space 15 is formed between the outer circumference of the coil 4 and the inner circumference of the outer yoke 2. These annular spaces 15 communicate with each other via a fan-shaped space 16 between the bobbins 14, and communicate with the gap 8 between the coil 4 and the guide pipe 7. The bobbin 14 electrically insulates between the coils 4 and between the coils 4 and the outer yoke 2 and the inner yoke 3 and may be made of, for example, thin glass epoxy.
[0024]
Lubricating oil (liquid lubricant) is sealed in the gap 8 between the coil 4 and the guide pipe 7, the fan-shaped space 16 between the bobbins 14, and the annular space 15 between the coil 4 and the outer yoke 2. Outside the bearings 9 on both sides, an oil seal 17 for preventing leakage of lubricating oil from the gap 8 and entry of foreign matter such as dust is provided. An oil supply plug 18 for supplying lubricating oil into the annular space 15 is provided on a side wall of the outer yoke 2.
[0025]
Next, the operation of the present embodiment configured as described above will be described.
The lubricating oil sealed in the gap 8 between the coil 4 and the guide pipe 7, the fan-shaped space 16 between the bobbins 14, and the annular space 15 between the coil 4 and the outer yoke 2 is applied to the sliding portion of the metal 9 </ b> A of the bearing 9. Since the oil film can be constantly maintained by being supplied, the sliding resistance can be greatly reduced and the durability can be greatly improved as compared with the conventional dry metal. Further, since lubricating oil can be appropriately supplied from the oil supply plug 18, maintenance is excellent.
[0026]
Since the coil 4 is immersed in the lubricating oil, the heat of the coil 4 generated by the operation of the electromagnetic damper 13 is efficiently transmitted to the guide tube 7 and the outer yoke 2 through the lubricating oil. Thus, overheating of the coil 4 can be prevented. As a result, the durability of the electromagnetic damper 13 can be improved by preventing the magnetic force of the permanent magnet 5 from deteriorating due to high temperature and deterioration of each part due to thermal stress, and a large current can be passed through the coil 4. The thrust of the damper 13 can be increased.
[0027]
Next, a fourth embodiment of the present invention will be described with reference to FIG. As shown in FIG. 6, in the electromagnetic damper 19 according to the fourth embodiment, a reservoir tank 20 is attached to the outer yoke 2 in the third embodiment. The interior of the reservoir tank 20 is defined by an oil chamber 22 and a gas chamber 23 communicating with the annular space 15 by a free piston 21. Lubricating oil is sealed in the oil chamber 22, and Is filled with a constant pressure gas (such as nitrogen gas). An oil supply plug 24 for replenishing the oil chamber 22 with lubricating oil is attached to the reservoir tank 20.
[0028]
With this configuration, the amount of lubricating oil sealed in the gap 8 between the coil 4 and the guide pipe 7, the fan-shaped space 16 between the bobbins 14, and the annular space 15 between the coil 4 and the outer yoke 2 is reduced. In this case, lubricating oil can be automatically supplied from the oil chamber 22 of the reservoir tank 20. Further, the volume change of the gap 8, the fan-shaped space 16 and the annular space 15, and the volume change of the lubricating oil due to the temperature change due to the heat generation of the coil 4 can be absorbed by the compression and expansion of the low-pressure gas in the gas chamber 23.
[0029]
Next, a fifth embodiment of the present invention will be described with reference to FIG. As shown in FIG. 7, in the fifth embodiment, the oil-impregnated cloth 25 is inserted into the gap 8 between the coil 4 and the guide pipe 7 in the configuration of the third or fourth embodiment. The oil-impregnated cloth 25 is a fibrous material capable of absorbing the lubricating oil, is immersed in the lubricating oil, and applies a certain amount of the lubricating oil to the surface of the guide pipe 7. The material of the oil-impregnated cloth 25 can be glass fiber or the like having heat resistance, electrical insulation, and mechanical strength.
[0030]
With this configuration, even when the lubricating oil decreases or the viscosity of the lubricating oil decreases due to an increase in temperature, the lubricating oil is applied to the surface of the guide pipe 7 by the oil-impregnated cloth 25 so that the bearing 9 can be stably supplied with a certain amount of lubricating oil, and lubricity can be maintained.
[0031]
Next, a sixth embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 8 and 9, in the sixth embodiment, in addition to the configuration of the third or fourth embodiment, an annular piston portion 26 (circulation means) is provided around the guide pipe 7 in the gap 8. It is protruding. The tip of the piston portion 26 is extended to the vicinity of the inner peripheral surface of the coil 4 and the bobbin 14. The stroke of the guide pipe 7 causes the piston portion 26 to move, so that the gap 8 and the fan-shaped space 16 In addition, the lubricating oil in the annular space 15 between the coil 4 and the outer yoke 2 flows and circulates. Thereby, the heat of the coil 4 can be efficiently radiated to each part via the lubricating oil, and the heat radiation of the coil 4 can be promoted.
[0032]
Further, in the seventh embodiment of the present invention shown in FIG. 10, in the configuration of the sixth embodiment, a check valve 27 is provided in the flow path of the lubricating oil, and the lubricating oil in the gap 8 and the annular space 15 is provided. By generating a one-way flow in the coil 4, the circulation of the lubricating oil is promoted and the heat radiation effect of the coil 4 is enhanced.
[0033]
Further, in the eighth embodiment of the present invention shown in FIG. 11, in place of providing the check valve 27 in the seventh embodiment, a flexible flap shape in which the piston portion 26 is inclined to one side is provided. By forming, the flap-shaped piston portion 26 bends with respect to the stroke to one side of the guide pipe 7 so as to generate a unidirectional flow in the gap 8 and the lubricating oil in the annular space 15. I have. Thus, the same operation and effect as those of the seventh embodiment can be obtained.
[0034]
Next, a ninth embodiment of the present invention will be described with reference to FIGS. In the electromagnetic damper 28 according to the ninth embodiment, a bobbin 29 provided between the coils 4 is formed in a ring shape with respect to the electromagnetic damper 13 (see FIGS. 3 to 5) of the third embodiment. The gap 8 between the coil 4 and the guide pipe 7 and the annular space 15 between the outer yoke 2 and the coil 4 are cut off, and the annular spaces 15 arranged on the outer periphery of each coil 4 Are communicated with each other via a notch 30 formed in the outer peripheral portion of the rim (see FIG. 15). The lubricating oil is sealed only in the annular space 15, and the gap 8 forms an air layer. Further, the bearing 9 is provided with an oil passage 31 that allows the sliding portion of the metal 9A to communicate with the annular space 15, and oil seals 17 are provided at both ends of the metal 9A.
[0035]
With this configuration, the lubricating oil in the annular space 15 is supplied to the sliding portion of the metal 9A of the bearing 9 via the oil passage 31, and the metal 9A and the guide pipe 7 are lubricated. This prevents leakage of lubricating oil and entry of foreign matter such as dust into the sliding portion. Further, the heat of the coil 4 is radiated through the lubricating oil in the annular space 15.
[0036]
Since the gap 8 is formed as an air layer, the heat of the coil 4 is less likely to be transmitted to the guide pipe 7 and the permanent magnet 6, so that the temperature rise of the permanent magnet 6 can be suppressed, and demagnetization due to overheating of the permanent magnet 6 can be prevented. Thus, the durability of the electromagnetic damper 28 can be increased.
[0037]
Further, in the tenth embodiment of the present invention shown in FIG. 17, an oil-impregnated cloth 32 is inserted into the oil passage 31 of the bearing 9 in the configuration of the ninth embodiment. Thus, even when the lubricating oil is reduced or the viscosity of the lubricating oil is reduced due to an increase in temperature, the lubricating oil is applied to the surface of the guide pipe by the oil-impregnated cloth 32 so that the sliding portion of the metal 9A is A certain amount of lubricating oil can be supplied stably, and lubricity can be maintained.
[0038]
In addition, in the eleventh embodiment of the present invention shown in FIG. 18, the oil passage is not formed in the metal 9A of the bearing 9 in the tenth embodiment, and the metal 9A and the metal 9A are disposed inside the metal 9A. An oil passage 31 is provided between the oil passage 17 and the oil seal 17, and an oil-containing cloth 32 is inserted into the oil passage 31. As a result, it is possible to prevent a decrease in durability due to drilling of the metal 9 </ b> A of the bearing 9.
[0039]
Next, a twelfth embodiment of the present invention will be described with reference to FIG. In the electromagnetic damper 33 according to the twelfth embodiment, the bearing 9 at one end of the outer yoke 2 is omitted from the electromagnetic damper 28 (see FIGS. 12 to 16) of the ninth embodiment, and a coil is provided at the end. An oil passage 34 communicating with the annular space 15 between the outer yoke 2 and the outer yoke 2 is provided, and an oil supply plug 35 is attached to the oil passage 34. The bottom of a cylindrical guide case 36 with a bottom is connected to the inner yoke 2 and the distal end of the guide pipe 7, and the cylindrical portion of the guide case 36 extends along the guide pipe 7 so as to cover it. The outer yoke 2 is slidably fitted to the outer periphery of the outer yoke 2. A dry metal 37 is attached as a sliding bearing to a sliding fitting portion of the guide case 36 with the outer yoke 2.
[0040]
With this configuration, the guide pipe 7 is slidably guided with respect to the outer yoke 2 by the bearing 9 and the dry metal 37. The lubricating oil sealed in the annular space 15 is supplied to the sliding portion of the metal 9A of the bearing 9 via the oil passage 31 to lubricate the sliding portion between the metal 9A and the guide pipe 7. Lubricating oil can be supplied to the annular space 15 by the oil supply plug 35. As in the ninth embodiment, the heat of the coil 4 is dissipated through the lubricating oil in the annular space 15 and the gap 8 between the coil 4 and the guide pipe 7 is used as an air layer, so that the heat of the coil 4 is permanent. It is difficult for the permanent magnets 6 to be transmitted to the magnets 6 and deterioration of the permanent magnets 6 due to heat can be prevented.
[0041]
Next, a thirteenth embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 20 and 21, the electromagnetic damper 38 according to the present embodiment has a double-cylinder structure including a bottomed cylindrical outer yoke 39 and an inner yoke 40 erected concentrically inside the outer yoke 39. It has a yoke 41 and a cylindrical rod 42 inserted between the outer yoke 39 and the inner yoke 40. The outer yoke 39 has a divided structure including a base end portion 39A and a distal end portion 39B formed integrally with the inner yoke 40.
[0042]
Bearings 43 for slidingly guiding the rod 42 are provided on the inner periphery of both ends of the distal end portion 39B of the outer yoke 39, and an annular space 44 is formed between the two bearings 43, the outer yoke 40, and the rod 42. Have been. The annular space 44 is sealed by an oil seal 45 provided outside the two bearings 43 in the axial direction, and lubricating oil is sealed in the annular space 44. An oil supply plug 46 for injecting lubricating oil into the annular space 44 is provided on a side wall of the distal end portion 39B of the outer yoke 43.
[0043]
A plurality of coils 4 are attached to the inner peripheral portion of the rod 42 along the axial direction. As in the ninth embodiment (see FIGS. 12 to 16), the rod-shaped bobbin 29 provided between the coils 4 and the retainers 47 attached to both ends of the coil 4 allow the rod 42 and the coil 4 to be connected to each other. A plurality of annular spaces 48 are formed, and the respective annular spaces 48 are communicated with each other via a cutout 30 formed on the outer peripheral portion of the bobbin 29. Lubricating oil is sealed in the annular space 48.
[0044]
A plurality of cylindrical permanent magnets 6 are attached to an outer peripheral portion of the inner yoke 40 so as to face the coil 4 of the rod 42. The outer yoke 39, the inner yoke 40, the rod 42, the coil 4, and the permanent magnet 6 constitute a magnetic circuit. A sufficiently small gap 49 (air layer) is provided between the coil 4 and the permanent magnet 6. In addition, a stroke end stopper (not shown) is provided to regulate the movable range of the rod 42.
[0045]
Next, the operation of the present embodiment configured as described above will be described.
When the rod 42 strokes, an induced current is generated in the coil 4 due to the relative displacement between the coil 4 and the permanent magnet 6 as in the other embodiments, and the damping force can be controlled by controlling this current. it can. Further, by energizing the coil 4, the electromagnetic damper 38 is operated as an actuator (linear motor) to generate a thrust on the rod 42.
[0046]
Since the lubricating oil in the annular space 44 is supplied to the sliding portion of the bearing 43, lubrication can be improved. Since the lubricating oil is sealed in the annular space 48 between the coil 4 and the rod 42, the heat of the coil 4 is efficiently transmitted to the rod 42 via the lubricating oil. it can. Further, since a gap 49 (air layer) is provided between the coil 4 and the permanent magnet 6, the heat of the coil 4 is hardly transmitted to the permanent magnet 6, and the overheating of the permanent magnet 6 is prevented. Can be.
[0047]
Next, a fourteenth embodiment of the present invention will be described with reference to FIG. In the fourteenth embodiment shown in FIG. 22, a solid lubricant 50 is inserted in the annular space 44 between the outer yoke 39 and the rod 42 instead of the lubricating oil in the thirteenth embodiment, The oil seal 45 is omitted. The annular space 48 between the coil 4 and the rod 42 is filled with a filler 51 having a high heat transfer coefficient instead of the lubricating oil.
[0048]
The solid lubricant 50 is formed, for example, by integrally molding a high-molecular-weight polyolefin resin or the like containing a lubricating oil component. The lubrication of the sliding portion with the rod 42 is maintained. In addition, a material that can maintain the lubricating performance even at a high temperature (about 150 ° C.) and hardly causes a change in shape is used. On the other hand, as the filler 51, for example, silicon or the like having excellent adhesion, high heat transfer coefficient, and flame retardancy is used.
[0049]
Thereby, the lubricating property of the sliding portion between the rod 42 and the bearing 43 can be enhanced by the solid lubricant 50, and the heat radiation of the coil 4 can be enhanced by the filler 51.
[0050]
Next, a fifteenth embodiment of the present invention will be described with reference to FIG. As shown in FIG. 23, the fifteenth embodiment differs from the third embodiment (see FIGS. 3 to 5) in that a fan-shaped bobbin 14 is provided between each coil 4 in the same manner as in the ninth embodiment. A ring-shaped bobbin 29 (see FIG. 15) is provided, and a solid lubricant 50 similar to that of the above-described fourteenth embodiment is inserted into the gap 8 between the coil 4 and the guide pipe 7 instead of the lubricating oil. The oil seal 17 of the bearing 9 is omitted. The annular space 15 between the outer yoke 2 and the coil 4 is filled with the same filler 51 as in the above-described fourteenth embodiment instead of the lubricating oil.
[0051]
With such a configuration, the solid lubricant 50 can enhance the lubrication of the sliding portion between the guide pipe 7 and the bearing 9, and the filler 51 can enhance the heat radiation of the coil 4.
[0052]
In each of the above embodiments, the case where a sliding bearing is used as the bearing is described. However, the present invention is not limited to this, and a linear bearing using a rolling element such as a ball may be used as the bearing. it can.
[0053]
【The invention's effect】
As described in detail above, according to the electromagnetic damper of the first aspect of the present invention, the bearing can be lubricated by supplying the lubricant to the bearing, so that the durability of the bearing can be improved.
According to the electromagnetic damper of the second aspect, the lubricant can be supplied to the bearing from the space between the magnet side member and the coil side member.
According to the electromagnetic damper according to the third aspect of the present invention, the heat of the coil is efficiently radiated through the lubricant, so that overheating of the coil can be prevented.
According to the electromagnetic damper of the fourth aspect, by circulating the lubricant by the circulating means, heat radiation of the coil by the lubricant can be promoted.
According to the electromagnetic damper of the fifth aspect, the circulation of the lubricant can be promoted by the check valve.
According to the electromagnetic damper of the sixth aspect, the supply amount of the lubricant can be adjusted by the oil-impregnated cloth, and the lubricity can be improved.
According to the electromagnetic damper of the invention of claim 7, it is possible to reliably prevent the lubricant from leaking from the bearing by the oil seal.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an electromagnetic damper according to a first embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of an electromagnetic damper according to a second embodiment of the present invention.
FIG. 3 is a longitudinal sectional view of an electromagnetic damper according to a third embodiment of the present invention.
FIG. 4 is an enlarged view showing a coil and a permanent magnet mounting portion of the electromagnetic damper shown in FIG. 3;
FIG. 5 is a longitudinal sectional view taken along line AA of FIG. 4;
FIG. 6 is a longitudinal sectional view of an electromagnetic damper according to a fourth embodiment of the present invention.
FIG. 7 is an enlarged longitudinal sectional view showing a main part of an electromagnetic damper according to a fifth embodiment of the present invention.
FIG. 8 is an enlarged longitudinal sectional view showing a main part of an electromagnetic damper according to a sixth embodiment of the present invention.
9 is a longitudinal sectional view of a mounting portion of a coil and a permanent magnet showing a flow of lubricating oil in the electromagnetic damper shown in FIG. 8;
FIG. 10 is a vertical sectional view of a coil and a permanent magnet mounting portion showing a flow of lubricating oil in an electromagnetic damper according to a seventh embodiment of the present invention.
FIG. 11 is an enlarged longitudinal sectional view showing a piston portion of an electromagnetic damper according to an eighth embodiment of the present invention.
FIG. 12 is a longitudinal sectional view of an electromagnetic damper according to a ninth embodiment of the present invention.
13 is an enlarged longitudinal sectional view showing a mounting portion of a coil and a permanent magnet of the electromagnetic damper shown in FIG. 12;
14 is an enlarged longitudinal sectional view showing a mounting portion of a bearing of the electromagnetic damper shown in FIG.
FIG. 15 is a longitudinal sectional view taken along line BB of FIG.
FIG. 16 is a longitudinal sectional view taken along line CC of FIG. 14;
FIG. 17 is an enlarged longitudinal sectional view showing a mounting portion of a bearing of an electromagnetic damper according to a tenth embodiment of the present invention.
FIG. 18 is an enlarged longitudinal sectional view showing a mounting portion of a bearing of an electromagnetic damper according to an eleventh embodiment of the present invention.
FIG. 19 is a longitudinal sectional view of an electromagnetic damper according to a twelfth embodiment of the present invention.
FIG. 20 is a longitudinal sectional view of an electromagnetic damper according to a thirteenth embodiment of the present invention.
FIG. 21 is an enlarged longitudinal sectional view showing mounting portions of a coil, a permanent magnet, and a bearing of the electromagnetic damper shown in FIG. 20;
FIG. 22 is an enlarged longitudinal sectional view showing a mounting portion of a coil, a permanent magnet, and a bearing of an electromagnetic damper according to a fourteenth embodiment of the present invention.
FIG. 23 is an enlarged longitudinal sectional view showing mounting portions of a coil, a permanent magnet, and a bearing of an electromagnetic damper according to a fifteenth embodiment of the present invention.
[Explanation of symbols]
1 Electromagnetic damper
2 Outer yoke (coil side member)
3 Inner yoke (magnet side member)
4 coils
5 Grease reservoir (space)
7 Guide pipe (magnet side member)
8 gap (space)
9 Bearing
17 Oil seal
25 Oil impregnated cloth
26 Piston part (circulation means)
27 Check valve

Claims (7)

A magnet-side member to which a magnet is attached and a coil-side member to which a coil is attached are provided so as to be relatively displaceable, and a current flowing through the coil is controlled with respect to a relative displacement between the magnet and the coil, so that damping force or thrust is reduced In the generated electromagnetic damper,
An electromagnetic damper comprising: a lubricant supply unit that supplies a lubricant to a bearing that supports the magnet-side member and the coil-side member so as to be displaceable from each other. 2. The electromagnetic damper according to claim 1, wherein the lubricant supply unit supplies the bearing with a lubricant sealed in a space formed between the magnet-side member and the coil-side member. 3. . The electromagnetic coil according to claim 1, wherein the coil is immersed in a lubricant of the lubricant supply unit. 4. The electromagnetic damper according to claim 1, further comprising a circulation unit configured to circulate a lubricant in the space by a relative displacement between the coil side member and the magnet side member. 5. The electromagnetic damper according to claim 4, wherein the circulation means includes a check valve for circulating the lubricant in one direction. The electromagnetic damper according to any one of claims 1 to 5, wherein the lubricant supply unit supplies a lubricant to the bearing via an oil-impregnated cloth. The electromagnetic damper according to any one of claims 1 to 6, wherein the bearing is provided with an oil seal for preventing leakage of a lubricant.

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