Vibration control device

Abstract

To provide a vibration control device which can control vibration in various directions received by a member to be vibration-controlled which is arranged in a severe environment such as a cosmic space, and can easily control vibration absorption performance and attenuation performance.SOLUTION: A vibration control device includes: a sliding contact plate which is brought into contact with an outer peripheral section of a disc spring curved in a convex shape to one side and forms a damping cell together with the disc spring; an insertion hole in which the disc spring and the sliding contact plate are consistently formed at a radial direction center of the damping cell; a positioning member which passes through a member to be vibration-controlled, is inserted into the insertion hole and positions a plurality of damping cells to be movable in an axial direction; and fixed plates which are fixed at each of both ends in the axial direction of the positioning member in a pre-compressed state of the disc spring. The disc spring is constituted of a plurality of vibration control bodies formed in a radial shape in a plan view from the radial direction center. When each damping cell is input with vibration toward the member to be vibration-controlled, vibration is absorbed by the vibration control bodies and vibration is damped by frictional force generated by sliding contact of each outer peripheral section of each vibration control body with the sliding contact plate.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a vibration isolation device, and particularly to a vibration isolation device suitable for use in outer space.

Background Art

[0002] Patent Document 1 discloses a vibration damping structure having a first component directly or indirectly connected to a vibration generating device and a second component directly or indirectly connected to a vibration receiving device. This vibration damping structure includes a rectilinear motion member configured asymmetrically with respect to an axis, and an elastic member that is arranged symmetrically with respect to the axis and connects between the first component and the second component and deforms as the first component and the second component move relative to each other in the axial direction.

[0003] The elastic member is two flat springs made of a vibration damping alloy material. Each flat spring deforms according to the movement of the rectilinear motion member in the axial direction, thereby attenuating the vibration received from the vibration generating device.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The above vibration damping structure cannot absorb or attenuate vibrations other than rectilinear motion. Further, the above vibration damping structure cannot easily control the vibration absorption performance and attenuation performance according to the mode of vibration input toward the vibration isolation member. Therefore, there is a need for a highly versatile vibration isolation device that can isolate vibrations in various directions and can easily control the vibration absorption performance and attenuation performance.

[0006] The present invention has been made in view of such problems, and an object thereof is to provide a vibration isolation device capable of isolating vibrations in various directions received by a vibration-isolated member disposed in outer space, and easily controlling vibration absorption performance and damping performance.

Means for Solving the Problems

[0007] In order to achieve the above object, a vibration isolation device of the present invention is a vibration isolation device for isolating a vibration-isolated member, and includes a disc spring that is convexly curved on one side, a sliding contact plate that contacts the outer peripheral portion of the disc spring and forms a damping cell together with the disc spring, an insertion hole that is formed continuously with the disc spring and the sliding contact plate at the radial center of the damping cell, a positioning member that penetrates the vibration-isolated member and is inserted into the insertion hole to position a plurality of damping cells movably in the axial direction, and fixing plates that are respectively fixed to both ends in the axial direction of the positioning member with the disc spring pre-compressed. The disc spring is composed of a plurality of vibration isolation bodies formed radially in a plan view from the radial center thereof. When vibration is input toward the vibration-isolated member, the damping cell absorbs the vibration by each vibration isolation body, and the vibration is damped by the frictional force generated when the individual outer peripheral portions of each vibration isolation body slide-contact the sliding contact plate.

Effects of the Invention

[0008] According to the vibration isolation device of the present invention, it is possible to isolate vibrations in various directions received by a vibration-isolated member disposed in outer space, and easily control vibration absorption performance and damping performance.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiment for Carrying out the Invention

[0010] Hereinafter, the vibration isolator 1 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a perspective view of the vibration isolator 1 according to the embodiment, and FIG. 2 shows a partial cross-section and a partially disassembled perspective view of the vibration isolator 1. The vibration isolator 1 is used to isolate the vibration of the vibration-isolated member 2 and includes a plurality of damping cells 6 stacked in the axial direction of the positioning member 4. The vibration-isolated member 2 is a member expected to prevent the transmission of external vibrations, and is, for example, a substrate on which precision devices such as various sensors and cameras are mounted.

[0011] The damping cell 6 is composed of a disc spring 8 and a sliding contact plate 10 on which the disc spring 8 is placed. An insertion hole 12 is formed through the disc spring 8 and the sliding contact plate 10 at the center in the radial direction of the damping cell 6. The disc spring 8 and the sliding contact plate 10 are made of metal. For example, the disc spring 8 is manufactured from stainless steel such as SUS301. That is, it is preferable that the damping cell 6, which affects the vibration absorption performance and damping performance of the vibration isolator 1, is manufactured from a metal whose physical properties do not deteriorate due to the influence of ultraviolet rays and cosmic rays in outer space.

[0012] The positioning member 4 is, for example, pipe-shaped, penetrates the vibration-isolated member 2, is inserted into the insertion hole 12 of each damping cell 6, and positions each damping cell 6 so as to be movable in the axial direction of the positioning member 4. In the vibration isolator 1 of the present embodiment, four damping cells 6 are arranged above and below the vibration-isolated member 2, respectively.

[0013] Also, as shown in FIG. 1, fixing plates 14 are respectively fixed to both ends of the positioning member 4 in the axial direction. Specifically, fitting holes 14a are formed in the fixing plates 14, and each fixing plate 14 is press-fitted and fixed by fitting the fitting holes 14a of the fixing plates 14 to both ends of the positioning member 4. Note that the fixing means of the fixing plate 14 may be other means such as using insertion bolts. FIG. 2 shows a state where each fixing plate 14 is removed from the positioning member 4. The disc spring 8 of the damping cell 6 is pre-compressed from the state of FIG. 2 to the state of FIG. 1 and is sandwiched and fixed by the upper and lower fixing plates 14, and the vibration absorption performance and damping performance of the vibration isolator 1 are preferably exhibited.

[0014] FIG. 3 shows a perspective view of the disc spring 8, FIG. 4 shows a perspective view of the sliding contact plate 10, and FIG. 5 shows a perspective view of the damping cell 6. The disc spring 8 is curved convex upward. The sliding contact plate 10 has a disc shape, and the outer peripheral portion 18 of the disc spring 8 is always in contact, and together with the disc spring 8, forms the damping cell 6 shown in FIG. 5. When vibration is input toward the vibration-isolated member 2, the damping cell 6 attenuates the vibration by the frictional force generated when the outer peripheral portion 18 of the disc spring 8 slides in contact with the sliding contact plate 10.

[0015] More specifically, the disc spring 8 has an inner peripheral surface portion 16, an outer peripheral portion 18, a tapered surface portion 20, and a slit 22, and a plurality of vibration isolators 24 are formed by the outer peripheral portion 18 and the tapered surface portion 20. The inner peripheral surface portion 16 is an annular flat portion, and as shown in FIG. 2, it abuts against the fixing plate 14 or against the sliding contact plate 10 of another damping cell 6 adjacent in the axial direction of the positioning member 4. The outer peripheral portion 18 is a portion where an annular flat portion is separated by a plurality of slits 22, and slides in contact with the sliding contact plate 10 when vibration is input toward the vibration-isolated member 2. Note that the outer peripheral portion 8 does not necessarily have to be configured as a flat surface as shown in the drawing, and for example, it may have a shape in which a convex portion partially contacts the sliding contact plate 10.

[0016] The tapered surface portion 20 is a portion where an annular inclined portion is separated by a plurality of slits 22, and is formed between the inner peripheral surface portion 16 and the outer peripheral portion 18. The slits 22 are formed by notching from the outer peripheral edge 18a of the outer peripheral portion 18 to the inner peripheral surface portion 16. When vibration is input toward the vibration isolation member 2, each individual tapered surface portion 20 separated by the slits 22 deforms so as to fall down at a predetermined taper angle with respect to the horizontal direction.

[0017] Thereby, vibration is absorbed according to the amount of deformation of each tapered surface portion 20, and the vibration absorption performance of the vibration isolation device 1 is exhibited. On the other hand, as shown by the arrow direction in FIG. 5, each individual outer peripheral portion 18 separated by the slit 22 is in sliding contact with the sliding contact plate 10 with a predetermined pressing force corresponding to the amount of deformation of the tapered surface portion 20 continuous with the outer peripheral portion 18. Thereby, vibration is attenuated according to the magnitude of the pressing force of each outer peripheral portion 18 against the sliding contact plate 10, and the attenuation performance of the vibration isolation device 1 is exhibited.

[0018] In this way, the disc spring 8 is composed of a plurality of vibration isolators 24 formed radially in a plane from the center in its radial direction, and the outer peripheral portion 18 and the tapered surface portion 20 of each vibration isolator 24 individually absorb vibration and attenuate vibration according to the input vibration. Further, as shown in FIG. 4, it is preferable that the sliding contact surface 10a of the sliding contact plate 10 with which the outer peripheral portion 18 is in sliding contact is chemically or physically surface-treated so that the surface roughness of the sliding contact surface 10a is different from that of other portions of the sliding contact plate 10 in order to change the frictional resistance of the sliding contact surface 10a.

[0019] Thereby, the frictional force when the outer peripheral portion 18 is in sliding contact with the sliding contact surface 10a can be increased, so that the attenuation performance of each vibration isolator 24, and thus the vibration isolation device 1, can be enhanced. Further, by changing the number of damping cells 6 constituting the vibration isolation device 1 or by changing the number of slits 22 of the disc spring 8, the vibration absorption performance and the attenuation performance of the entire vibration isolation device 1 can be flexibly and easily controlled.

[0020] FIG. 6 shows a perspective view of the fixed plate 14. The fixed plate 14 has a disc shape with an outer diameter larger than that of the sliding contact plate 10, and is fitted into the fitting holes 14a at both ends of the positioning member 4 as described above and fixed by press-fitting or inserting bolts or the like. Thereby, the disc springs 8 of each damping cell 6 are sandwiched and fixed between the upper and lower fixed plates 14 in a pre-compressed state, and the vibration absorption performance and damping performance of the vibration isolation device 1 are preferably exhibited. The fixed plate 14 is preferably manufactured from a metal that is highly resistant to the effects of ultraviolet rays and cosmic rays in outer space.

[0021] FIG. 7 shows a perspective view of the positioning member 4. The positioning member 4 is preferably manufactured from a metal that is highly resistant to the effects of ultraviolet rays and cosmic rays in outer space. In addition, in the case of the present embodiment, a support member 26 is attached to the outer peripheral surface of the positioning member 4. The support member 26 is preferably a cylindrical body formed from a material having excellent slidability, and a plurality of rib portions 26a are respectively extended in the axial direction with an interval in the circumferential direction. The rib portions 26a reduce the contact area with the member on the sliding side, that is, the insertion holes 12 of each damping cell 6.

[0022] Thereby, the slidability of each damping cell 6 with respect to the positioning member 4 is improved. In addition, the support member 26 supports each damping cell 6 so as to be movable in its insertion hole 12, and in particular, each damping cell 6 is positioned at a predetermined position by each rib portion 26a. Thereby, each damping cell 6 can be stably positioned at a predetermined interval in the axial direction. The positioning member 4 and the support member 26 may be integrally formed.

[0023] As described above, the vibration isolation device 1 of the present embodiment is formed by inserting the positioning member 4 into the insertion holes 12 of a plurality of damping cells 6 composed of the disc springs 8 and the sliding contact plates 10, and fixing the fixed plate 14 in a state where the disc springs 8 of each damping cell 6 are pre-compressed at both ends in the axial direction of the positioning member 4. In such a vibration isolation device 1, the disc spring 8 is composed of a plurality of vibration isolation bodies 24 formed radially in a plan view from the center in the radial direction, and when vibration is input toward the vibration-isolated member 2 in the damping cell 6, each vibration isolation body 24 absorbs the vibration.

[0024] In addition, the damping cell 6 attenuates vibrations by the frictional force generated when the respective outer peripheral portions 18 of each vibration isolator 24 are in sliding contact with the sliding contact plate 10. Since each vibration isolator 24 is formed radially in plan view, the vibration isolator 1 can isolate vibrations in various directions, not limited to the rectilinear motion received by the vibration-isolated member 2. Further, by changing the number of damping cells 6 or by changing the number of slits 22, that is, the number of vibration isolators 24, the vibration absorption performance and damping performance of the entire vibration isolator 1 can be flexibly and easily controlled.

[0025] More specifically, the disc spring 8 abuts against the fixing plate 14 or the sliding contact plate 10 of another adjacent damping cell 6 on its inner peripheral surface portion 16, and the vibration isolator 24 has an outer peripheral portion 18 separated by a slit and a tapered surface portion 20 formed between the inner peripheral surface portion 16 and the outer peripheral portion 18 for absorbing vibrations input to the vibration-isolated member 2. When vibrations are input toward the vibration-isolated member 2, the tapered surface portions 20 of the vibration isolators 24 are deformed so as to fall at a predetermined taper angle, and the outer peripheral portions 18 of the vibration isolators 24 are in sliding contact with the sliding contact plate 10 with a predetermined pressing force corresponding to the amount of deformation of the tapered surface portions 20.

[0026] Thereby, vibrations are absorbed according to the amount of deformation of each tapered surface portion 20, and the vibration absorption performance of the vibration isolator 1 is exhibited. Also, vibrations are attenuated according to the magnitude of the pressing force of each outer peripheral portion 18 against the sliding contact plate 10, and the damping performance of the vibration isolator 1 is exhibited. Further, the sliding contact surface 10a of the sliding contact plate 10 with which the outer peripheral portion 18 is in sliding contact preferably has a surface roughness different from that of other portions of the sliding contact plate 10. Thereby, since the frictional force when the outer peripheral portion 18 is in sliding contact with the sliding contact surface 10a can be increased, the damping performance of each vibration isolator 24 and thus the vibration isolator 1 can be enhanced.

[0027] Also, a support member 26 for supporting the damping cell 6 so as to be movable in the axial direction is attached to the outer peripheral surface of the positioning member 4. Thereby, since each damping cell 6 is stably positioned with a predetermined interval in the axial direction, the vibration absorption performance and damping performance of the vibration isolator 1 can be effectively exhibited.

[0028] With the above description of the embodiments of the present invention completed, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, in the vibration isolator 1 of the above embodiment, four damping cells 6 are arranged above and below the vibration-isolated member 2 respectively. However, it is not limited to this, and the number of damping cells 6 arranged above and below the vibration-isolated member 2 can be changed according to the vibration isolation mode required for the vibration isolator 1.

[0029] Also, the support member 26 may be, for example, a metal coil spring as long as it can support the damping cell 6 so as to be movable in the axial direction. In this case, the coil spring is wound around the positioning member 4, and each damping cell 6 is elastically supported so as to be movable in the coil portion positioned with an interval. Note that the support member 26 may not be provided as long as each damping cell 6 can be supported so as to be movable in the axial direction only by the positioning member 4.

[0030] Also, the damping cell 6 may be composed of a disc spring 8 and a sliding contact plate 10. For example, the disc springs 8 may be arranged opposite to each other above and below one sliding contact plate 10, and the outer peripheral portions 18 of the disc springs 8 may be brought into contact with the upper and lower surfaces of the sliding contact plate 10 respectively. Thereby, since the number of damping cells 6 can be reduced with respect to a required predetermined vibration isolation mode, the vibration isolator 1 can be simplified. Further, the positioning member 4 and the fixing member 14 may be formed of materials other than metal when they do not significantly affect the vibration absorption performance and damping performance of the vibration isolator 1 and can withstand the use environment. Also, the vibration isolator 1 of the above embodiment is suitable for use in outer space, but can be used in various environments not limited to outer space.

Description of Reference Numerals

[0031] 1 Vibration isolator 2 Vibration-isolated member 4 Positioning member 6 Damping cell 8 Disc spring 10 Sliding contact plate 10a Sliding contact surface 12 Insertion hole 14 Fixing plate 16 Inner peripheral surface 18 Outer peripheral part 20 Tapered surface part 24 Vibration isolator 26 Support member

Claims

1. A vibration isolation device that isolates a vibration-isolated member, comprising: A disc spring that is curved convexly to one side; a sliding contact plate that contacts an outer periphery of the disc spring and forms a damping cell together with the disc spring; an insertion hole formed in the radial center of the damping cell so as to extend through the disc spring and the sliding contact plate; a positioning member that penetrates the vibration-damped member and is inserted into the insertion hole, and that positions the plurality of damping cells so as to be movable in the axial direction; a fixing plate fixed to each end of the positioning member in the axial direction in a state in which the disc spring is precompressed; Equipped with The disc spring is composed of a plurality of vibration-isolating bodies formed radially from a radial center thereof in a plan view, The damping cell is a vibration-damping device in which, when vibration is input toward the vibration-damped member, the vibration is absorbed by each of the vibration-damping bodies and the vibration is damped by the frictional force generated when the individual outer peripheries of each of the vibration-damping bodies slide against the sliding contact plate.

2. the disc spring has an inner circumferential surface portion that contacts the fixed plate or the sliding contact plate of another damping cell adjacent in the axial direction, 2. The vibration-damping device according to claim 1, wherein the vibration-damping body has an outer circumferential portion separated by a slit, and a tapered surface portion formed between the inner circumferential surface portion and the outer circumferential portion, which absorbs vibrations input to the vibration-damped member.

3. 3. The vibration-damping device of claim 2, wherein when vibration is input toward the vibration-damping member, the tapered surface portions of the vibration-damping body deform so as to tilt at a predetermined taper angle, and the outer periphery of the vibration-damping body slides against the sliding contact plate with a predetermined pressing force corresponding to the amount of deformation of the tapered surface portions.

4. 4. The vibration isolation device according to claim 3, wherein the sliding surface of the sliding plate with which the outer circumferential portion slides has a surface roughness different from other portions of the sliding plate.

5. The vibration isolation device according to claim 1 , wherein a support member is attached to an outer circumferential surface of the positioning member, the support member supporting the damping cell movably in the axial direction.

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