JPS61116141A - Vibration damping equipment - Google Patents

Abstract

PURPOSE:To make a vibration damping ratio improvable, by altering a magnetic field of an electromagnet body with a variation in current carrying capacity, while controlling a variation in apparent viscosity of a magnetic fluid. CONSTITUTION:With an electromagnet part 11, a magnetic field is avoided becoming extremely unbalanced, and a very effective magnetic field 14 is addable to a magnetic fluid 4 flowing in a narrow passage part 3 formed between an inner circumferential surface of an outer tube part 1 and an outer circumferential surface of an inner tube part 2. Therefore, apparent viscosity in the magnetic fluid is yet more increasable owing to the magnetic field 14. And, the said apparent viscosity in the magnetic fluid 4 regulates current carrying capacity of the electromagnet part 11 from the outside, making it controllable, thus a vibration damping ratio is made so favorable enough.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a vibration damping device characterized by skillfully combining an electromagnetic body and a magnetic fluid. The apparent viscosity of the magnetic fluid can be freely changed in response to a free change in the amount of current in the electromagnetic body while utilizing the phenomenon of increase in the apparent viscosity of the magnetic fluid caused by the combination of the magnetic body and the magnetic fluid. By changing the damping effect at the same time, it is possible to quickly dampen various types of induced vibrations, and at the same time, it is possible to immediately respond to any change in load or vibration that requires vibration damping. This invention relates to a vibration damping device that can be used in various fields requiring vibration. The present invention is based on Patent Application No. 176894 filed in 1982, whose inventor and applicant are the same as the present application.
Patent Application No. 111984, 1988, Patent Application No. 111
This invention relates to improvements to the inventions of No. 985.

(Prior Art) Conventionally, various devices such as spring mechanisms and the like have existed as devices for damping vibrations. However, in various conventional devices, in order to further enhance the vibration damping effect, the elastic mechanism inside the device was made as flexible as possible, so the vibrations that should be damped were caused by the elastic mechanism itself. The problem is that the vibration damping efficiency decreases because it continues indefinitely. Also.

In various conventional vibration damping devices, the vibration generation source and the vibration damping mechanism inside the device were generally in contact with each other, so the vibrations induced as a result of this contact state were However, this is transmitted to the mechanism itself which is intended to suppress the vibration, and this causes the inconvenience that the mechanism itself becomes a vibration medium.

In reality, an extremely important problem to be solved was how to improve the vibration damping ratio while eliminating the above problems.

The above-mentioned applied inventions, which are the basic inventive techniques of the present invention, were developed based on the conventional circumstances as described above. The features and improvements of the present invention are summarized as follows.

That is, in each of the basic invention techniques of the present invention, vibration damping is achieved by using a phenomenon in which a plurality of magnets are used in combination with a magnetic fluid, and the apparent viscosity increases due to the magnetic field of the magnetic fluid. In contrast,
The present invention is characterized in that an electromagnet is used instead of the magnet, and the appearance of the magnetic fluid is changed by changing the amount of current in the electromagnet and changing the magnetic field of the electromagnet. By changing the viscosity and thus the braking force effect and freely controlling these operations from outside the device, it is possible to immediately respond to any changes in load or vibration that require vibration damping. It is characterized by this.

(Object of the present invention) Here, the present invention is a vibration damping device that skillfully utilizes the phenomenon of increase in the apparent viscosity of the magnetic fluid caused by the combination of a magnetic body and a magnetic fluid. Although it is common to all basic inventions, its purpose is to skillfully combine an electromagnet and a magnetic fluid, freely change the amount of current in the electromagnet, and change the field of the electromagnet to change the appearance of the magnetic fluid. By freely controlling changes in viscosity and, in turn, changes in braking force action from outside the device, various vibrations that require vibration damping and are induced can be damped immediately and with high efficiency, while achieving an extremely good vibration damping ratio. In addition,
To provide a vibration damping device that can immediately respond to any change in load or vibration that requires vibration damping, and can freely carry out the immediate damping response operation from outside the device. It's about doing.

(Example of the present invention) The present invention will be described in detail below with reference to the attached figures.

In the present invention, it goes without saying that the mechanism itself is not limited to that of each embodiment, but the following embodiments will be explained in the case where the mechanism of the device according to the present invention is, for example, a piston type. do.

For convenience of explanation, in each embodiment of the present invention, those in FIGS. 1, 2, 8, and 9 are referred to as apparatus A, those in FIGS. The device shown in FIG. 7 will be described as device C.

(First example) First, the configuration of the first embodiment apparatus A is as follows.

That is, in device A, an inner cylinder part 2 is placed inside an outer cylinder part 1 made of a non-ferrous material so as to exhibit an electromagnetic function, and the outer circumferential surface of the inner cylinder part 2 and the outer cylinder part 1 are connected. A passage portion 3 with an appropriate gap is formed between the inner circumferential surface and the magnetic fluid 4 is delivered into the outer cylinder portion 1. The inner cylinder part 2 is fixed to a support shaft part 5 made of a non-ferrous material on its upper surface, and an appropriate flat plate part 6 is provided on the upper surface of the support shaft part 5.
For example, when this device is used as a vibration-proof pedestal, an upper pedestal 16 such as equipment is appropriately arranged,
A lower pedestal 17 is disposed on the lower surface of the outer cylinder portion 1. As shown in the example shown in the figure, the structure of the inner cylindrical part 2 made of an electromagnetic body is such that each electromagnet part 1 is
A plurality of electromagnets 1 are stacked, and the surfaces of the electromagnets facing each other are of the same polarity. Therefore, magnetic fields 13 are generated on the outer circumferential surface of the inner cylindrical portion 2 configured in this manner, as shown by the broken lines in FIG. , a phenomenon occurs in which the magnetic field becomes minimum at the center of each electromagnet section 11.

In the present invention, it goes without saying that various arrangement combinations of the electromagnet parts 11 constituting the inner cylinder part 2 can be considered, and are not limited to the five illustrated examples. Furthermore, any kind of electromagnet may be used as each electromagnet section 11, and there are no limitations on the number of stacked electromagnet sections 11, or whether the device itself is used in parallel. Be free.

(F32 Example) Device B showing the second example has an outer cylinder portion 2 made of a non-magnetic material.
An electromagnet part 21 is disposed inside the inner periphery of the section 0, and an inner cylindrical part 22 made of a non-magnetic material is disposed inside the electromagnet part 21, and between the outer periphery of the inner cylindrical part and the inner periphery of the electromagnet part. A magnetic fluid 24 is delivered and built into the outer cylindrical portion 20 while forming a passage portion 23 with an appropriate gap. As shown in the example shown in the figure, each electromagnet section has spacers 25 interposed in between, and the stacked opposing surfaces thereof are made to have the same polarity. Therefore, the inner peripheral surface of the electromagnet section 21 configured in this manner In this case, each magnetic field 28 is generated as shown by the broken line in FIG. 4, and the maximum and intense magnetic field 29 is generated at each intervening spacer 25, while the magnetic field is at its minimum at the center of each electromagnet 26. cause

In addition, in this device B, it goes without saying that various arrangements and combinations of the electromagnet parts 21 can be considered, and are not limited to the illustrated example. Furthermore, various types of electromagnet parts 21 can be used as each electromagnet part 21. Of course, as in the first embodiment, there are no limitations on the number of layers or whether the devices themselves can be used in parallel.

However, in the water device B, the arrangement and combination of the electromagnet parts 21 is not limited to the example shown in the figure, and various cases can be considered. For example, as shown in FIG. It may be made to be exposed.

The support shaft part 30 made of a non-magnetic material connected above the inner cylindrical part 22, the flat plate part 31 at the upper end of the shaft part, and the flat plate part 31, for example, as an example of the application of the device iB. When used as a shaking stand, an upper stand 32 for equipment etc. is provided,
The lower pedestal 33 is disposed on the lower surface of the outer cylinder, which is the same as in the first embodiment.

(Third Embodiment) The device C of the embodiment is similar to the device A of the first embodiment or the second embodiment.
While the basic configuration is the same as that of the device B of the embodiment, these basic configurations are made into a vibration damping mechanism X as described later, and while the mechanism X is built-in, it is possible to use some appropriate means such as an air spring system, etc. It is constructed from an elastic mechanism Y that is made as flexible as possible and has spring properties.

The above-mentioned elastic mechanism Y may be configured to have a springy part made as soft as possible by appropriate means in order to further exhibit vibration-proof machine running. Specifically, the springy part may be an air spring, for example. In the example shown in the figure,
An elastic mechanism Y includes an air chamber 42 with a spring portion 41 made of soft rubber supported at its lower end by a side frame 40 made of steel or the like. Reference numeral 43 in Figure 0 indicates that the side frame 40 and spring portion 41 are tightened. This is the fastening part that is attached, and the reference numeral 44 indicates the appropriate equipment not shown in the figure. This is a connecting portion that connects the upper pedestal 45 and the spring portion 41, which are placed in the upper frame 45, and is disposed at the center of the spring portion 41.

The structure of the vibration damping mechanism X includes an electromagnet part 47 disposed inside the inner periphery of a basic outer cylinder part 46 made of a non-magnetic material, and an inner cylinder part 48 made of a non-magnetic material arranged inside the electromagnet part. A magnetic fluid 50 is delivered and built into the basic outer cylinder part 46 while forming a passage part 49 with an appropriate gap between the outer peripheral surface of the inner cylinder part and the inner peripheral surface of the electromagnet part. Inner cylinder part 48
A support shaft portion 51 made of a non-magnetic material is fixedly provided above, and the upper end of the shaft portion has a fixed portion 5 whose upper surface is centered on the inner surface of the spring portion 41.
Reference numeral 54 in FIG. 0 is a pipe section for supplying and loading air to the air chamber 42, and reference numeral 55 is a pipe section of the basic outer cylinder section 46, on which an appropriate flat plate section 53 is fixedly connected. It is an inclined part formed at the upper end of the air chamber, and it is located at the lower end of the air chamber.

The structure of the electromagnet section 47 is the same as that of the electromagnet section 21 in the device B of the second embodiment, as shown in the example shown in the figure, and the stacked opposing surfaces thereof are made to have the same polarity with spacers 56 interposed therebetween. . Therefore, magnetic fields 28 are generated on the inner circumferential surface of the electromagnet section 47 configured in this manner, as indicated by the broken lines in FIG. , a phenomenon occurs in which the magnetic field becomes minimum at the center of each electromagnet.

Note that the arrangement and combination of the electromagnet parts is not limited to the illustrated example, that any type of electromagnet can be used, the number of stacked electromagnet parts, or the use of this device itself in parallel. teeth,
The above-mentioned 1.
and the same as in each of the second embodiments.

However, in this device C, the configuration of the vibration damping mechanism X is as follows:
The present invention is not limited to the illustrated example, and various cases may be considered. For example, as in the device A of the first embodiment shown in FIG. Alternatively, an inner cylindrical portion 59 may be formed and set aside, and the magnetic fluid 50 may be accommodated and incorporated within the inner cylindrical portion.

Therefore, in the case where the device C in which the mechanisms x and Y are configured as described above is used as an anti-vibration pedestal for equipment etc. as an example of its application, the upper pedestal 45 for the equipment etc. is placed on the device. A lower pedestal or floor section 60 is disposed on the lower surface of the basic outer cylinder section 46.

(Operations and effects of the first embodiment) In the device A of the embodiment, the formation of the inner cylinder part 2 and the continuous arrangement of the electromagnet parts 11 prevent the magnetic field from becoming extremely non-uniform, and the outer cylinder part l. A narrow 1. is formed between the inner circumferential surface of the inner cylindrical portion 2 and the outer circumferential surface of the inner cylinder portion 2. A magnetic field 14 can be applied very effectively to the magnetic fluid 4 flowing through the N passage section 3, and furthermore, the apparent viscosity of the magnetic fluid can be further increased by the magnetic field 14. Furthermore, the apparent viscosity of the magnetic fluid 4 can be controlled by changing and adjusting the amount of current of the electromagnet 11 very easily by appropriately changing the amount of current flowing through the electromagnet 11 from outside the device (not shown). In this case, the operation for changing the amount of current can be performed manually or automatically.

Here, in the vibration damping device A, when the device A is configured as a piston type as in the embodiment, as the inner cylinder portion 2 moves up and down, the magnetic fluid 4 moves through the narrow l/) passage portion 3 at a speed. Since the flow does not occur while creating a gradient, a pressure difference proportional to the average velocity of the flow is generated between the upper and lower surfaces of the inner cylinder portion 2, which causes a braking force, and further utilizes the braking force. By combining the magnetic fluid 4 and the electromagnet parts 11 that constitute the inner cylinder part 2 and exhibit the electromagnetic function as in the above embodiment, The strong magnetic field 14 causes the apparent viscosity of the magnetic fluid 4 to increase as much as possible, resulting in an even greater braking effect due to the braking force existing between the viscosity of the magnetic fluid 4 and the gap in the passage section 3. In addition, the amount of current flowing through each electromagnet section 11 constituting the inner cylinder section 2 is controlled by an appropriate operating mechanism (not shown). By changing the magnetic field of the electromagnet while changing the magnetic field of the electromagnet, the apparent viscosity of the magnetic fluid and, in turn, the braking force effect can be changed, and these operations can be freely controlled from outside the device to achieve vibration damping. Therefore, it is possible to immediately dampen any change in load or vibration as appropriate.

On the other hand, the device A of the present invention shown in the embodiment exhibits a particularly excellent vibration damping effect as described above, and also has an inner cylindrical portion 2 consisting of each electromagnetic portion 11 laminated in a magnetic fluid 4 and having an electromagnetic function. In addition, due to the strong magnetic field 14 generated on the outer peripheral surface of the inner cylinder part 2, the inner cylinder part 2 is always centered without coming into contact with the inner peripheral surface of the outer cylinder part 1. have Therefore, in other words, the present device can be said to be a non-contact type vibration damping mechanism, and can completely eliminate the inconvenience of the conventional contacting mechanical parts themselves becoming vibration media. .

What is illustrated here as an example of the mechanism and application of the present device is a case in which the present invention is constituted by a piston system and the application is appropriately used as a vibration-proof mount for equipment, etc. In the figure, the upper mount 16 is It is supported on a lower pedestal 17 by a spring portion 18 shown in FIG. 8, and the present device is installed between the upper and lower pedestals. Therefore, the damping constant is determined in advance from the natural period of the vibration isolating frame, and the apparent viscosity and damping action of the magnetic fluid are automatically changed by changing the amount of current in the inner cylinder 2, which has an electromagnetic function. When the wooden FF1A is used in such a vibration-isolating pedestal by adjusting and controlling, the device itself quickly and immediately damps the vibrations induced in either the upper or lower pedestal without becoming any vibration mediator. Moreover, it is possible to freely and immediately dampen any change in load or vibration occurring on the pedestal from outside the device.

It goes without saying that the device A can be used for vibration damping in various fields without being limited to the above-mentioned application examples.

As explained above, the present device A described in one embodiment
In addition to being able to eliminate the defects and inconveniences of the prior art while solving the above-mentioned conventional problems at a low cost, the mechanism has no contact, so there is no wear on each part, resulting in an extremely long service life. Since the inner cylinder always performs the centering function, there is no need for any special means for centering as in the past, and it has extremely excellent effects as a vibration damping device, while also being able to withstand various types of random induced vibrations. This is an excellent device that can be widely applied, and it goes without saying that the second and third embodiments described below also have these excellent effects.

(Operations and Effects of the Second Embodiment) In the device B of the embodiment, the electromagnet parts 21 are arranged in series to prevent the magnetic field from becoming extremely non-uniform, and the inner cylindrical part 2
A magnetic field 29 can be applied extremely effectively to the magnetic fluid 24 flowing through the narrow passage 23 formed between the outer circumferential surface of the electromagnet 2 and the inner circumferential surface of the electromagnet 21. can further increase the viscosity. The apparent viscosity of the magnetic fluid z4 can be controlled by changing and adjusting the current amount of the electromagnetic part 21 very easily by appropriately changing the amount of current flowing through the electromagnet section 21 from outside the device (not shown). In this case, as in device A, the operation for changing the amount of current can be performed manually or automatically.

Here, in the vibration damping device B, when the device B is configured as a piston system as in the embodiment, the magnetic fluid 24 moves along the east passage portion 23 with a velocity gradient as the inner cylinder portion 22 moves up and down. As a result, a pressure difference proportional to the average speed of the flow occurs between the upper and lower surfaces of the inner cylinder portion 22, which causes a braking force, and further utilizes the braking force to The circulation is intended to quickly attenuate the induced vibrations, and by combining the magnetic fluid 24 and the electromagnet section 21 as in the above embodiment, the viscosity of the magnetic fluid 24 and the passage section 2 can be reduced.
The intense magnetic field 29 increases the apparent viscosity of the magnetic fluid 24 as much as possible, thereby adding an even greater braking effect to the braking force existing in the gap 3, thereby reducing the induced vibrations. Furthermore, the amount of current flowing through the electromagnet section 21 can be adjusted immediately to changes in load or vibration that require vibration damping, for example, by using an appropriate operating mechanism (not shown). By automatically changing the magnetic field of the electromagnet, the apparent viscosity of the magnetic fluid, and thus the braking force, can be freely controlled from outside the device, allowing vibration damping to be performed as needed. This makes it possible to immediately dampen any changes in load or vibration.

On the other hand, similarly to the first embodiment, in addition to exhibiting a particularly excellent vibration damping effect as described above, the device B has each electromagnet section having an electromagnetic function that is stacked so as to cover the magnetic fluid 24. 21 and the strong magnetic field 29 generated on the outer peripheral side of the inner cylinder part 22, the inner cylinder part 22 is always centered without coming into contact with the inner peripheral surface of the electromagnet part 21. have Therefore, like the device A of each of the embodiments described above, in other words, this device can be said to be a non-contact type vibration damping mechanism, in which each mechanical part itself that is brought into contact as in the prior art becomes a vibration medium. It can completely eliminate the inconvenience of storing things away.

Here, the mechanism and application example of the device B according to the embodiment are illustrated in the case where the present invention is constructed using a piston system similar to the device A in the embodiment described above, and the application is appropriately used as a vibration-isolating stand for equipment, etc. In the figure, the upper rack b32 is connected to the lower rack 3 by the spring part 18 shown in FIG.
3, and this device is installed between the upper and lower frames. Therefore, the damping constant is determined in advance from the natural period of the vibration isolating frame, and furthermore, the apparent viscosity and damping action of the magnetic fluid are automatically changed by changing the amount of current of the electromagnet section 21 having an electromagnetic function. By adjusting and controlling, when this device B is used in such a vibration-isolating frame, the device itself quickly and immediately damps the vibrations induced in either the upper or lower frame without acting as a vibration mediator. Moreover, it is possible to freely and immediately dampen any change in load or vibration occurring on the pedestal from outside the device.

It goes without saying that device B, like device A, can be used for vibration damping in various fields without being limited to the above-mentioned application examples.

(Operations and effects of the third embodiment) In the present device C, the vibration damping mechanism X has the device A
, B, a large braking force, etc. are induced at the same time as the magnetic field (see FIGS. 2 and 4).

On the other hand, the elastic mechanism Y is placed above the vibration damping mechanism X, and is placed on the upper frame 45 by its air chamber 42 and spring portion 41, with air supply and exhaust being adjusted by the tube portion 54. It has the function of isolating vibrations generated from equipment as efficiently as possible.

Therefore, the device C exhibits its vibration damping function through a skillful combination of the vibration damping mechanism X, which has the basic structure of the device A or device B, and the elastic mechanism Y.

In this device C, as with each of the devices A and B, the apparent viscosity and braking function of the magnetic fluid 50 can be extremely easily changed by appropriately changing the amount of current in the electromagnet section 47 from outside the device (not shown). Since it can be controlled by changing and adjusting, the magnetic field of the electromagnet can be automatically changed by using an appropriate operating mechanism (not shown), for example, in order to immediately respond to various loads that require vibration damping or changes in vibration, while the apparent viscosity of the magnetic fluid is changed. By freely controlling changes in braking force from outside the device,
In addition to being able to immediately respond to any changes in load or vibration that require vibration damping, the inner cylinder portion 48 or 59 is constantly centered without any means required, and vibration damping is achieved in a non-contact manner. It is the same as the embodiment devices A and B in terms of the mechanism and other aspects.

In addition, in this device C, the elastic mechanism Y is configured to cover and cover the vibration damping mechanism X, so that
The inside of the vibration damping mechanism X is completely sealed, completely blocking dust, lumps, etc. from entering the inside, and
By being able to prevent evaporation of the magnetic fluid, it is possible to successfully eliminate inadvertent adverse effects on the various mechanisms of the device itself, especially the magnetic fluid.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of device A according to the first embodiment, FIG. 2 is a front view extracting the main parts of FIG. 1, and FIG. 3 is a vertical cross-sectional view of device B according to the second embodiment. FIG. 4 is a vertical cross-sectional view showing the main parts of FIG. 3, FIG. 5 is a vertical cross-sectional view showing the main parts of the apparatus B of the other embodiment shown in FIG. 3, and FIG. FIG. 7 is a vertical cross-sectional view of the device C according to another embodiment of FIG. 6, and FIG. 8 is a schematic side view showing an example in which the device iA according to the first embodiment is used as a vibration-isolating frame. 9 are schematic front views of the same. Main symbols in the figure Device A of the first embodiment 1 fist/outer cylinder part, 2 fist/φ inner cylinder part, 3/φ fist passage part, 4
...Magnetic fluid, 11...Electromagnet part, 12---Spacer, 13...Fist magnetic field, 1411...Magnetic field, 16...
・Upper mount, 17...Device B of the lower mount 2 embodiment 20.Outer cylindrical part, 21 and fist/electromagnet part, 22...Inner cylindrical part, 23.Passway part, 24@- φ magnetic fluid, 25-
-・Spacer, 2811ψΦ magnetic field, 29φ0. magnetic field,
320.・Upper stand, 33. .・Lower stand. Device C of the third embodiment
8.59... Inner cylinder part, 49... Passage part, 50...
Magnetic fluid, 56... ψ spacer, 60, gold - lower stand or floor. Cleaning of the drawings (no change in content) 1 duck 1 (3 20th 7th procedural amendment (method) % formula % 2, name of the invention Vibration damping device 3, person making the amendment Relationship with the case Patent applicant Address: 5-1o-18 Higashigotanda, Tokyo Parts Ward (Iwata Building) Name: Yakumo Kogyo Co., Ltd. 4; Agent Address: 9-1-7 Akasaka, Minato-ku, Tokyo; “Drawings” and “Power of Attorney” 7. Contents of amendments We will submit an engraving of the drawings originally attached to the application (no changes to the contents) and a power of attorney. 8. List of attached documents

Claims (1)

[Claims] 1. A large braking force can be induced by skillfully combining a plurality of electromagnets and a magnetic fluid to generate an intense magnetic field and further increase the apparent viscosity of the magnetic fluid. In addition, by freely changing the apparent viscosity of the magnetic fluid while changing the magnetic field of the electromagnet in response to a free change in the amount of current in the electromagnet, the braking force action can be freely changed. While improving the characteristics and phase characteristics extremely well, it can quickly damp various induced vibrations, and at the same time, it can immediately respond to appropriate loads that require vibration damping or any changes in vibration. A vibration damping device (A) characterized by: 2. By cleverly combining a plurality of electromagnets and a magnetic fluid, a strong magnetic field is generated and the apparent viscosity of the magnetic fluid is further increased to induce a large braking force. By freely changing the apparent viscosity of the magnetic fluid while changing the magnetic field of the electromagnet in response to a free change in the amount of current, the braking force action can be freely changed, thereby achieving excellent transient characteristics and phase characteristics. Vibration damping that is characterized by quickly damping various types of induced vibrations while improving the improvement, and at the same time being able to immediately respond to any changes in appropriate loads or vibrations that require vibration damping. In the device, a support shaft portion (30) made of a non-magnetic material is located under an upper frame (32) for appropriate equipment, etc., which is a source of vibration generation.
An inner cylinder part (22) made of a non-magnetic material formed at the lower end of the
A passage part (with appropriate clearance) surrounding the inner cylinder part (
The outer cylindrical part (23) made of a non-magnetic material is
0), each spacer (25
) A vibration damping device (B ). 3. By skillfully combining a plurality of electromagnets and a magnetic fluid, a strong magnetic field is generated and the apparent viscosity of the magnetic fluid is further increased to induce a large braking force. By freely changing the apparent viscosity of the magnetic fluid while changing the magnetic field of the electromagnet in response to a free change in the amount of current, the braking force action can be freely changed, thereby achieving excellent transient characteristics and phase characteristics. Vibration damping that is characterized by quickly damping various types of induced vibrations while improving the improvement, and at the same time being able to immediately respond to any changes in appropriate loads or vibrations that require vibration damping. It consists of a mechanism (X) and an elastic mechanism (Y) which houses the vibration damping mechanism described above and has elasticity made as flexible as possible by appropriate means such as an air spring system. A vibration damping device (C) characterized by: 4. The vibration damping mechanism according to claim 3 (
In X), the part of the electromagnet part (47) is replaced with the basic outer cylinder part (46) made of a non-magnetic material, and the part is replaced with the inner cylinder part (48), which has the electromagnetic function. A vibration damping device (C) according to claim 3, wherein the vibration damping device (C) has an inner cylindrical portion (59).