JP7520229B2 - Vibration Isolation Unit - Google Patents

Description

The present disclosure relates to a vibration isolation device.

For equipment whose performance may be degraded by vibration, a vibration isolation device may be provided to reduce vibration transmitted from a vibration source to the equipment. One example of a vibration isolation device is disclosed in Patent Document 1. The vibration isolation device disclosed in Patent Document 1 includes an elastic element that generates a reaction force according to the relative displacement between the vibration source and the object to be isolated, and a damping element that generates a reaction force according to the relative speed between the vibration source and the object. The vibration isolation device disclosed in Patent Document 1 reduces vibration transmitted from the vibration source to the object by generating a reaction force using the elastic element and the damping element.

Another example of a vibration isolation device is one that includes an inerter element that generates a reaction force according to the relative acceleration between the vibration source and the object, and reduces the vibration transmitted from the vibration source to the object by generating a reaction force using the inerter element. An example of a vibration isolation device that includes an inerter element is disclosed in Patent Document 2.

U.S. Patent No. 5,332,070 Special table 2019-522151 publication

The performance of the vibration isolation device is expressed by the vibration transmission characteristics that show the relationship between the vibration frequency and the vibration transmissibility. In the vibration transmission characteristics of the vibration isolation device disclosed in Patent Document 1, in the vibration isolation region where the vibration transmissibility is less than 0 dB, the vibration transmissibility decreases at a constant rate of -40 dB/dec. In order to improve the vibration isolation performance of the vibration isolation device, it is preferable that the vibration isolation region is wide. Since the frequency at which the vibration transmissibility is 0 dB is proportional to the resonance frequency, in order to widen the vibration isolation region, it is necessary to lower the resonance frequency by lowering the natural frequency, and to lower the frequency at which the vibration transmissibility is 0 dB. When the mass of the vibration isolation device is constant, it is necessary to lower the rigidity in order to lower the natural frequency. In other words, in the vibration isolation device disclosed in Patent Document 1, there is a trade-off between vibration isolation performance and rigidity.

In the vibration transmission characteristics of the vibration isolation device disclosed in Patent Document 2, the vibration transmissibility in the frequency range higher than the resonant frequency decreases at a rate according to the mass of the inerter element. In detail, as the mass of the inerter element increases, the vibration transmissibility decreases significantly. For this reason, the vibration isolation device disclosed in Patent Document 2 can improve vibration isolation performance without reducing rigidity. However, in order to increase the rate of decrease in vibration transmissibility, it is necessary to increase the mass of the inerter element. For this reason, the vibration isolation device becomes larger in order to improve vibration isolation performance.

This disclosure has been made in consideration of the above-mentioned circumstances, and aims to improve the vibration isolation performance of a vibration isolation device while suppressing an increase in size of the vibration isolation device and a decrease in the rigidity of the vibration isolation device.

In order to achieve the above object, the vibration isolation device of the present disclosure is a vibration isolation device that reduces vibration transmitted from a vibration source to an object, and includes one or more inertial bodies and a plurality of first connecting members. The one or more inertial bodies are displaceable around a rotation axis. Each of the plurality of first connecting members is attached to either the object or the vibration source and the inertial body, and displaces the attached inertial body around the rotation axis in response to a relative displacement between the object and the vibration source caused by the vibration of the vibration source. In at least one of the first connecting members, the distance between the part of the first connecting member attached to the inertial body and the rotation axis is shorter than the distance between the part of the first connecting member attached to the object or the vibration source and the rotation axis.

The vibration isolation device of the present disclosure includes a plurality of first connection members that are attached to an object or a vibration source and an inertial body, and displace the inertial body around a rotation axis in response to the relative displacement between the object and the vibration source caused by the vibration of the vibration source. In at least one of the plurality of first connection members, the distance between the part of the first connection member attached to the inertial body and the rotation axis of the inertial body is shorter than the distance between the part of the first connection member attached to the object or the vibration source and the rotation axis, so that the apparent inertial force of the inertial body as seen from the vibration source is increased, and the vibration transmitted from the vibration source to the object is reduced. The vibration isolation device of the present disclosure does not require a reduction in rigidity or an increase in mass in order to improve vibration isolation performance, so that a small-sized vibration isolation device with high rigidity and high vibration isolation performance can be obtained.

FIG. 1 is a perspective view of a vibration isolation device according to a first embodiment; FIG. 2 is a plan view of an inertial body to which a first connecting member according to the first embodiment is attached; 1 is a bottom view of an inertial body to which a first connecting member according to a first embodiment is attached; FIG. 1 is a diagram showing vibration transmission characteristics of the vibration isolation device according to the first embodiment. FIG. 13 is a perspective view of a vibration isolation device according to a second embodiment. 11 is a bottom view of an inertial body to which a second connecting member according to a second embodiment is attached; FIG. FIG. 11 is a plan view of an inertial body to which a second connecting member according to a second embodiment is attached; FIG. 11 is a plan view of an inertial body to which a second connecting member according to a second embodiment is attached; 11 is a bottom view of an inertial body to which a second connecting member according to a second embodiment is attached; FIG. FIG. 13 is a perspective view of a vibration isolation device according to a third embodiment. 13 is a bottom view of an inertial body to which a second connecting member according to a third embodiment is attached; FIG. 13 is a plan view of an inertial body to which a second connecting member according to a third embodiment is attached; FIG. 13 is a plan view of an inertial body to which a second connecting member according to a third embodiment is attached; 13 is a bottom view of an inertial body to which a second connecting member according to a third embodiment is attached; FIG. 13 is a perspective view of a vibration isolation device according to a fourth embodiment. FIG. 1 is a perspective view of a first modified example of an anti-vibration device according to an embodiment; FIG. 13 is a perspective view of a second modified example of the vibration isolation device according to the embodiment; FIG. 13 is a front view of a third modified example of the vibration isolation device according to the embodiment;

Hereinafter, a vibration isolation device according to an embodiment of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or equivalent parts are denoted by the same reference numerals.

(Embodiment 1)
A vibration isolation device 1 that is provided between a vibration source 12 that generates vibrations and an object 11 that is to be isolated from vibrations and that reduces vibrations transmitted from the vibration source 12 to the object 11 will be described in embodiment 1. The vibration isolation device 1 shown in FIG. 1 is attached to a surface 12a of the vibration source 12 that faces the object 11, and supports the object 11.

In FIG. 1, the Z axis indicates the direction in which the vibration source 12 and the object 11 face each other. Specifically, the Z axis is perpendicular to both the surface 12a of the vibration source 12 and the surface 11a of the object 11 facing the vibration source 12. In embodiment 1, the Z axis indicates the vertical direction. In embodiment 1, the X axis indicates the short side direction of the object 11, which has a rectangular parallelepiped shape. The Y axis indicates the long side direction of the object 11. The X axis, Y axis, and Z axis are perpendicular to each other.

The vibration isolation device 1 includes an inertial body 13 that is displaceable around a rotation axis AX1 indicated by a dashed line, and first connection members 21, 31 that are attached to the object 11 or the vibration source 12 and the inertial body 13 and displace the inertial body 13 around the rotation axis AX1 in response to the relative displacement between the object 11 and the vibration source 12. The vibration isolation device 1 reduces the vibration transmitted from the vibration source 12 to the object 11 by converting the translational displacement of the object 11 and the vibration source 12 in the Z-axis direction into a rotational displacement of the inertial body 13 in the circumferential direction around the rotation axis AX1 by the first connection members 21, 31. The details of each part of the vibration isolation device 1 are described below.

The inertial body 13 has, for example, a cylindrical shape with its central axis coinciding with the opposing direction of the object 11 and the vibration source 12, in other words, with its central axis parallel to the Z-axis. The inertial body 13 is displaceable around a rotation axis AX1 that coincides with the central axis. In the first embodiment, the inertial body 13 is preferably formed of a high-density material, for example, a metal such as iron, stainless steel, tungsten, or a tungsten alloy. By forming the inertial body 13 from a high-density material, it is possible to increase the moment of inertia with the same volume.

The first connecting member 21 is attached to the surface 11a of the object 11 facing the vibration source 12 and to the surface 14 of the inertial body 13 facing the object 11, and supports the object 11. The distance between the part of the first connecting member 21 attached to the inertial body 13 and the rotation axis AX1 is shorter than the distance between the part of the first connecting member 21 attached to the object 11 and the rotation axis AX1.

In the first embodiment, the first connection member 21 is formed of a plurality of first rod-shaped members 22, specifically, three first rod-shaped members 22, attached to the surfaces 11a and 14. Each first rod-shaped member 22 applies a reaction force to the object 11 and the inertial body 13 in response to a force acting on each first rod-shaped member 22 due to the relative displacement between the object 11 and the vibration source 12. In the first embodiment, each first rod-shaped member 22 is formed of a rod-shaped member that extends linearly from the object 11 to the inertial body 13. Due to the relative displacement between the object 11 and the vibration source 12, a force in the extension direction of each first rod-shaped member 22 acts on each first rod-shaped member 22. In response to this, each first rod-shaped member 22 applies a reaction force in the extension direction to the object 11 and the inertial body 13.

In order to displace the inertial body 13 around the rotation axis AX1 by the reaction force applied by each first rod-shaped member 22 to the inertial body 13, as shown in Figures 1 and 2, the end 23 of each first rod-shaped member 22 attached to the inertial body 13 is positioned vertically below the end 24 of each first rod-shaped member 22 attached to the target 11. Figure 2 is a view of the first connecting member 21 and the inertial body 13 viewed in the negative Z-axis direction. In detail, the end 23 is positioned offset from the end 24 in a first direction D1, which is one of the circumferential directions around the rotation axis AX1, and in a centripetal direction, which is a direction toward the rotation axis AX1. The first direction D1 is a counterclockwise direction when the inertial body 13 is viewed in the negative Z-axis direction.

It is preferable that the ends 23 of the first rod-shaped members 22 are positioned at equal intervals in the circumferential direction around the rotation axis AX1. In the first embodiment, the ends 23 of the first rod-shaped members 22 are positioned at equal intervals on a circumference C1 of radius L1 centered on the rotation axis AX1 on a plane perpendicular to the rotation axis AX1, specifically, on the surface 14 of the inertial body 13. It is preferable that the ends 24 of the first rod-shaped members 22 are positioned at equal intervals in the circumferential direction around the rotation axis AX1. In the first embodiment, the ends 24 of the first rod-shaped members 22 are positioned at equal intervals on a circumference C2 of radius L2 centered on the rotation axis AX1 on a plane perpendicular to the rotation axis AX1, specifically, on the surface 11a of the object 11. By making the radius L1 smaller than the radius L2, the distance between the end 23 and the rotation axis AX1 becomes shorter than the distance between the end 24 and the rotation axis AX1.

As described above, in order to apply a reaction force to the object 11 and the inertial body 13, it is preferable that each first rod-shaped member 22 is formed of a material with high axial rigidity, such as iron, stainless steel, etc. In order to displace the inertial body 13 around the rotation axis AX1 by the reaction force applied to the inertial body 13, it is preferable that each first rod-shaped member 22 has small shear rigidity and bending rigidity. Therefore, it is preferable that each first rod-shaped member 22 is formed of a wire bundle formed by bundling together multiple wires formed of a material with high axial rigidity.

For example, each first rod-shaped member 22 is inserted into a hole formed in the surface 11a of the object 11 and a hole formed in the surface 14 of the inertial body 13, and is attached to the object 11 and the inertial body 13 by a method such as welding, bonding with an adhesive, fastening with a fastening member, etc.

1, the first connecting member 31 is attached to the surface 12a of the vibration source 12 facing the object 11 and the surface 15 of the inertial body 13 facing the vibration source 12, and supports the inertial body 13. The distance between the portion of the first connecting member 31 attached to the inertial body 13 and the rotation axis AX1 is shorter than the distance between the portion of the first connecting member 31 attached to the vibration source 12 and the rotation axis AX1.

In the first embodiment, the first connection member 31 is formed of a plurality of first rod-shaped members 32, specifically, three first rod-shaped members 32, attached to the surfaces 12a and 15. Each first rod-shaped member 32 applies a reaction force to the vibration source 12 and the inertial body 13 in response to a force acting on each first rod-shaped member 32 due to the relative displacement between the object 11 and the vibration source 12. In the first embodiment, each first rod-shaped member 32 is formed of a rod-shaped member extending from the vibration source 12 to the inertial body 13. Due to the relative displacement between the object 11 and the vibration source 12, a force in the extension direction of each first rod-shaped member 32 acts on each first rod-shaped member 32. In response to this, each first rod-shaped member 32 applies a reaction force in the extension direction to the vibration source 12 and the inertial body 13.

Because the reaction force applied by each first rod-shaped member 32 to the inertial body 13 displaces the inertial body 13 around the rotation axis AX1, as shown in Fig. 3, the end 33 attached to the inertial body 13 of each first rod-shaped member 32 is positioned vertically above the end 34 attached to the vibration source 12 of each first rod-shaped member 32. Fig. 3 is a view of the first connecting member 31 and the inertial body 13 viewed in the positive direction of the Z axis. In detail, the end 33 is positioned offset from the end 34 in both the first direction D1 and the centripetal direction.

The ends 33 of the first rod-shaped members 32 are preferably positioned at equal intervals in the circumferential direction around the rotation axis AX1. In the first embodiment, the ends 33 of the first rod-shaped members 32 are positioned at equal intervals on a plane perpendicular to the rotation axis AX1, specifically, on the surface 15 of the inertial body 13, on a circumference C3 of radius L3 centered on the rotation axis AX1. The ends 34 of the first rod-shaped members 32 are preferably positioned at equal intervals in the circumferential direction around the rotation axis AX1. In the first embodiment, the ends 34 of the first rod-shaped members 32 are positioned at equal intervals on a plane perpendicular to the rotation axis AX1, specifically, on the surface 12a of the vibration source 12, on a circumference C4 of radius L4 centered on the rotation axis AX1. By making the radius L3 smaller than the radius L4, the distance between the end 33 and the rotation axis AX1 becomes shorter than the distance between the end 34 and the rotation axis AX1.

As described above, in order to apply a reaction force to the vibration source 12 and the inertial body 13, it is preferable that each first rod-shaped member 32 is formed of a material with high axial rigidity, such as iron, stainless steel, etc. In order to displace the inertial body 13 around the rotation axis AX1 by the reaction force applied to the inertial body 13, it is preferable that each first rod-shaped member 32 has small shear rigidity and bending rigidity. Therefore, it is preferable that each first rod-shaped member 32 is formed of a wire bundle formed by bundling together multiple wires formed of a material with high axial rigidity.

For example, each first rod-shaped member 32 is inserted into a hole formed in the surface 12a of the vibration source 12 and a hole formed in the surface 15 of the inertial body 13, and is attached to the vibration source 12 and the inertial body 13 by a method such as welding, bonding with an adhesive, or fastening with a fastening member.

The operation of the vibration isolation device 1 having the above configuration is described below using as an example a case where the vibration of the vibration source 12 narrows the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 compared to the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 when no vibration of the vibration source 12 is occurring.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 becomes narrow, a force acts on the first connecting member 21 shown in FIG. 1 to shrink the first connecting member 21. Specifically, a force acts on each of the first rod-shaped members 22 of the first connecting member 21 in a direction to shrink each of the first rod-shaped members 22. In response to this, each of the first rod-shaped members 22 applies a reaction force to the object 11 and the inertial body 13. In detail, a force from each of the first rod-shaped members 22 toward the object 11 acts on the object 11, and a force from each of the first rod-shaped members 22 toward the inertial body 13 acts on the inertial body 13. The force acting on the inertial body 13 is represented by a tangential force F1 that displaces the inertial body 13 in the first direction D1, and a centripetal force F2, as shown by the solid arrows in FIG. 2.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 becomes narrow, a force that shrinks the first connecting member 31 shown in FIG. 1 acts on the first connecting member 31. Specifically, a force in a direction that shrinks each first rod-shaped member 32 acts on each first rod-shaped member 32 of the first connecting member 31. In response to this, each first rod-shaped member 32 applies a reaction force to the vibration source 12 and the inertial body 13. In detail, a force from each first rod-shaped member 32 toward the vibration source 12 acts on the vibration source 12, and a force from each first rod-shaped member 32 toward the inertial body 13 acts on the inertial body 13. The force acting on the inertial body 13 is represented by a tangential force F3 that displaces the inertial body 13 in the first direction D1, and a centripetal force F4, as shown by the solid arrows in FIG. 3.

As described above, the tangential forces F1 and F3 act on the inertial body 13, displacing the inertial body 13 in the first direction D1. In other words, the first connecting members 21 and 31 provided in the vibration isolation device 1 operate as a mechanism for converting the translational displacement of the object 11 and the vibration source 12 in the Z-axis direction into a rotational displacement of the inertial body 13 in the first direction D1.

On the other hand, when the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 becomes wider due to the vibration of the vibration source 12 compared to the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 when the vibration source 12 is not vibrating, a force that stretches the first connecting member 21 shown in FIG. 1 acts on the first connecting member 21. Specifically, a force in a direction that stretches each first rod-shaped member 22 acts on each first rod-shaped member 22 of the first connecting member 21. In response to this, each first rod-shaped member 22 applies a reaction force to the object 11 and the inertial body 13. In detail, a force that pulls the object 11 toward each first rod-shaped member 22 acts on the object 11, and a force that pulls the inertial body 13 toward each first rod-shaped member 22 acts on the inertial body 13. The forces acting on the inertial body 13 are represented by a tangential force F1' that displaces the inertial body 13 in a second direction D2, and an eccentric force F2' that moves the inertial body 13 away from the rotation axis AX1, as shown by the dotted arrows in Fig. 2. The second direction D2 is a circumferential direction around the rotation axis AX1 and is opposite to the first direction D1. More specifically, the second direction D2 is a clockwise direction when the inertial body 13 is viewed in the negative direction of the Z axis.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 becomes wider, a force that stretches the first connecting member 31 shown in FIG. 1 acts on the first connecting member 31. Specifically, a force in a direction that stretches each first rod-shaped member 32 acts on each first rod-shaped member 32 of the first connecting member 31. In response to this, each first rod-shaped member 32 applies a reaction force to the vibration source 12 and the inertial body 13. In detail, a force that pulls the vibration source 12 toward each first rod-shaped member 32 acts on the vibration source 12, and a force that pulls the inertial body 13 toward each first rod-shaped member 32 acts on the inertial body 13. The force acting on the inertial body 13 is a force in the opposite direction to the force F3, as shown by the dotted arrow in FIG. 3, and is represented by a tangential force F3' that displaces the inertial body 13 in the second direction D2, and an eccentric force F4'.

As described above, the tangential forces F1' and F3' act on the inertial body 13, causing the inertial body 13 to be displaced in the second direction D2. In other words, the first connecting members 21 and 31 provided in the vibration isolation device 1 operate as a mechanism for converting the translational displacement of the object 11 and the vibration source 12 in the Z-axis direction into the rotational displacement of the inertial body 13 in the second direction D2.

The apparent inertial force of the inertial body 13 as seen by the vibration source 12 increases due to losses that occur during the conversion of translational displacement into rotational displacement, in other words, the conversion from translational kinetic energy to rotational kinetic energy.

2, in each of the first rod-shaped members 22 of the first connecting member 21, the distance between the end 23 located on the circumference C1 of radius L1 and the rotation axis AX1 is shorter than the distance between the end 24 located on the circumference C2 of radius L2 and the rotation axis AX1. Therefore, the moment arm of the inertial body 13 is shorter than when the end 23 is vertically below the end 24, and the moment of force generated in the inertial body 13 is smaller.

3, in each first rod-shaped member 32 of the first connecting member 31, the distance between the end 33 located on the circumference C3 of radius L3 and the rotation axis AX1 is shorter than the distance between the end 34 located on the circumference C4 of radius L4 and the rotation axis AX1. Therefore, the moment arm of the inertial body 13 is shorter than when the end 33 is vertically above the end 34, and the moment of force generated in the inertial body 13 is smaller.

In other words, the distance between the ends 23, 33 and the rotation axis AX1 is shorter than the distance between the ends 24, 34 and the rotation axis AX1, so that the apparent inertial force of the inertial body 13 as seen from the vibration source 12 is further increased. As a result, the vibration transmitted from the vibration source 12 to the object 11 is reduced.

Figure 4 shows an example of the vibration transmission characteristics of the vibration isolation device 1. As a comparative example, the vibration transmission characteristics of a vibration isolation device having an elastic element and a damping element as disclosed in Patent Document 1 are shown by a solid line, and the vibration transmission characteristics of a vibration isolation device having an inerter element as disclosed in Patent Document 2 are shown by a dashed line. The vibration transmission characteristics of the vibration isolation device 1 according to embodiment 1 are shown by a dotted line.

The horizontal axis of Figure 4 indicates the vibration frequency (unit: Hz) of the vibration source 12, and the vertical axis indicates the vibration transmissibility (unit: dB) of the vibration isolation device 1. In a range where the vibration transmissibility is greater than 0, the vibration generated by the vibration source 12 is amplified and transmitted to the object 11. In a range where the vibration transmissibility is less than 0, the vibration transmitted from the vibration source 12 to the object 11 is reduced. For example, when the vibration source 12 vibrates at a vibration frequency fz, it is preferable to set the vibration transmissibility at the vibration frequency fz to a sufficiently small value.

In the comparative vibration isolation device having elastic elements and damping elements, the vibration transmissibility decreases at a rate of, for example, -40 dB/dec in the range where the vibration frequency is higher than the resonant frequency f1. Therefore, in order to make the vibration transmissibility at the vibration frequency fz sufficiently small, it is necessary to set the resonant frequency f1 to a smaller value. In order to lower the resonant frequency f1, it is necessary to lower the natural frequency of the vibration isolation device. If the mass of the vibration isolation device is constant, it is necessary to lower the rigidity of the vibration isolation device in order to lower the natural frequency. For this reason, in the comparative vibration isolation device having elastic elements and damping elements, there is a trade-off between vibration isolation performance and rigidity.

In the comparative vibration isolation device having an inerter element, the vibration transmissibility drops sharply in the range where the vibration frequency is higher than the resonant frequency f2, compared to the comparative vibration isolation device having an elastic element and a damping element. The rate of decrease in the vibration transmissibility in the range where the vibration frequency is higher than the resonant frequency f2 is proportional to the mass of the inerter element. In other words, in order to increase the rate of decrease in the vibration transmissibility, it is necessary to increase the mass of the inerter element. As a result, the vibration isolation device becomes larger in order to improve the vibration isolation performance.

The vibration transmissibility of the vibration isolation device 1 drops more rapidly than that of the vibration isolation device of the comparative example in a range where the vibration frequency is higher than the resonant frequency f3. Therefore, the resonant frequency f3 becomes a higher value than that of the vibration isolation device of the comparative example, and it is possible to set the natural frequency to a high value.

As described above, the first connecting members 21, 31 provided in the vibration isolation device 1 according to embodiment 1 operate as a mechanism that converts the translational displacement in the Z-axis direction between the object 11 and the vibration source 12 into a rotational displacement in the circumferential direction about the rotation axis AX1 of the inertial body 13. Because the distance between the ends 23, 33 and the rotation axis AX1 is shorter than the distance between the ends 24, 34 and the rotation axis AX1, the apparent inertial force of the inertial body 13 as seen from the vibration source 12 increases, and the vibration transmitted from the vibration source 12 to the object 11 is reduced.

Unlike the vibration isolation device of the comparative example shown in Figure 4, the vibration isolation device 1 does not require a reduction in rigidity or an increase in mass in order to improve vibration isolation performance. This allows for a small-sized vibration isolation device 1 with high rigidity and excellent vibration isolation performance.

(Embodiment 2)
The vibration isolation apparatus 1 may include any number of inertial bodies 13. The vibration isolation apparatus including a plurality of inertial bodies will be described below, focusing on the differences from the vibration isolation apparatus 1 according to embodiment 1. A vibration isolation apparatus 2 according to embodiment 2 shown in Fig. 5 includes a plurality of inertial bodies 13a, 13b, and 13c, a first connecting member 21 attached to the object 11 and the inertial body 13a, and a first connecting member 31 attached to the vibration source 12 and the inertial body 13b.

The vibration isolation device 2 further includes a second connecting member 41 attached to the inertial bodies 13a, 13c and displaces the inertial bodies 13a, 13c around the rotation axis AX1 in response to the relative displacement between the object 11 and the vibration source 12, and a second connecting member 51 attached to the inertial bodies 13b, 13c and displaces the inertial bodies 13b, 13c around the rotation axis AX1 in response to the relative displacement between the object 11 and the vibration source 12.

The configuration of the inertial bodies 13a, 13b, and 13c is similar to that of the inertial body 13 provided in the vibration isolation device 1 according to embodiment 1. In embodiment 2, the inertial bodies 13a, 13b, and 13c are positioned in a line at equal intervals in the Z-axis direction.

The configuration of the first connecting member 21 is similar to that of the first connecting member 21 provided in the vibration isolation device 1 according to embodiment 1. The first connecting member 21 is attached to the surface 11a of the object 11 and to the surface 14a of the inertial body 13a facing the object 11, and supports the object 11. The distance between the portion of the first connecting member 21 attached to the inertial body 13a and the rotation axis AX1 is shorter than the distance between the portion of the first connecting member 21 attached to the object 11 and the rotation axis AX1.

The configuration of the first connecting member 31 is similar to that of the first connecting member 31 provided in the vibration isolation device 1 according to embodiment 1. The first connecting member 31 is attached to the surface 12a of the vibration source 12 and the surface 15b of the inertial body 13b facing the vibration source 12, and supports the inertial body 13b. The distance between the part of the first connecting member 31 attached to the inertial body 13b and the rotation axis AX1 is shorter than the distance between the part of the first connecting member 31 attached to the vibration source 12 and the rotation axis AX1.

The distance between the portion of the second connecting member 41, 51 attached to the inertial body 13a, 13b to which the first connecting member 21, 31 is attached and the rotation axis AX1 is shorter than the distance between the portion of the second connecting member 41, 51 attached to the inertial body 13c adjacent to the inertial body 13a, 13b and the rotation axis AX1.

The second connecting member 41 is attached to the surface 15a of the inertial body 13a facing the inertial body 13b and the surface 14c of the inertial body 13c facing the inertial body 13a, and supports the inertial body 13a. The distance between the part of the second connecting member 41 attached to the inertial body 13a and the rotation axis AX1 is shorter than the distance between the part of the second connecting member 41 attached to the inertial body 13c and the rotation axis AX1.

In the second embodiment, the second connection member 41 is formed of a plurality of second rod-shaped members 42, specifically, three second rod-shaped members 42, attached to the surfaces 15a and 14c. Each second rod-shaped member 42 applies a reaction force to the inertial bodies 13a and 13c in response to a force acting on each second rod-shaped member 42 due to the relative displacement between the object 11 and the vibration source 12. In the second embodiment, each second rod-shaped member 42 is formed of a rod-shaped member extending from the inertial body 13a to the inertial body 13c. Due to the relative displacement between the object 11 and the vibration source 12, a force in the extension direction of each second rod-shaped member 42 acts on each second rod-shaped member 42. In response to this, each second rod-shaped member 42 applies a reaction force in the extension direction to the inertial bodies 13a and 13c.

In order to displace the inertial bodies 13a and 13c around the rotation axis AX1 by the reaction force applied by each second rod-shaped member 42 to the inertial bodies 13a and 13c, as shown in Figures 5, 6, and 7, the end 43 attached to the inertial body 13c of each second rod-shaped member 42 is positioned vertically below the end 44 attached to the inertial body 13a of each second rod-shaped member 42. Figure 6 is a view of the second connecting member 41 and the inertial body 13a viewed in the positive direction of the Z axis. Figure 7 is a view of the second connecting member 41 and the inertial body 13c viewed in the negative direction of the Z axis. In detail, the end 44 is positioned offset from the end 43 in both the first direction D1 and the centripetal direction.

The ends 43 of the second rod-shaped members 42 are preferably located at equal intervals in the circumferential direction around the rotation axis AX1. In the second embodiment, the ends 43 of the second rod-shaped members 42 are located at equal intervals on a circumference C5 of radius L5 centered on the rotation axis AX1 on a plane perpendicular to the rotation axis AX1, specifically, on the surface 14c of the inertial body 13c. The ends 44 of the second rod-shaped members 42 are preferably located at equal intervals in the circumferential direction around the rotation axis AX1. In the second embodiment, the ends 44 of the second rod-shaped members 42 are located at equal intervals on a circumference C6 of radius L6 centered on the rotation axis AX1 on a plane perpendicular to the rotation axis AX1, specifically, on the surface 15a of the inertial body 13a. By making the radius L6 smaller than the radius L5, the distance between the end 44 and the rotation axis AX1 becomes shorter than the distance between the end 43 and the rotation axis AX1.

As described above, in order to apply a reaction force to the inertial bodies 13a, 13c, it is preferable that each second rod-shaped member 42 is formed of a material with high axial rigidity, such as iron, stainless steel, etc. In order to displace the inertial bodies 13a, 13c around the rotation axis AX1 by the reaction force applied to the inertial bodies 13a, 13c, it is preferable that each second rod-shaped member 42 has small shear rigidity and bending rigidity. Therefore, it is preferable that each second rod-shaped member 42 is formed of a wire bundle formed by bundling together multiple wires formed of a material with high axial rigidity.

For example, each second rod-shaped member 42 is inserted into a hole formed in surface 15a of inertial body 13a and a hole formed in surface 14c of inertial body 13c, and attached to inertial bodies 13a, 13c by a method such as welding, bonding with an adhesive, or fastening with a fastening member.

5, the second connecting member 51 is attached to the surface 14b of the inertial body 13b facing the inertial body 13c and the surface 15c of the inertial body 13c facing the inertial body 13b, and supports the inertial body 13c. The distance between the part of the second connecting member 51 attached to the inertial body 13b and the rotation axis AX1 is shorter than the distance between the part of the second connecting member 51 attached to the inertial body 13c and the rotation axis AX1.

In the second embodiment, the second connection member 51 is formed of a plurality of second rod-shaped members, specifically, three second rod-shaped members 52, attached to the surfaces 14b and 15c. Each second rod-shaped member 52 applies a reaction force to the inertial bodies 13b and 13c in response to a force acting on each second rod-shaped member 52 due to the relative displacement between the object 11 and the vibration source 12. In the second embodiment, each second rod-shaped member 52 is formed of a rod-shaped member extending from the inertial body 13b to the inertial body 13c. Due to the relative displacement between the object 11 and the vibration source 12, a force in the extension direction of each second rod-shaped member 52 acts on each second rod-shaped member 52. In response to this, each second rod-shaped member 52 applies a reaction force in the extension direction to the inertial bodies 13b and 13c.

In order to displace the inertial bodies 13b, 13c around the rotation axis AX1 by the reaction force applied by each second rod-shaped member 52 to the inertial bodies 13b, 13c, the end 53 attached to the inertial body 13c of each second rod-shaped member 52 is positioned vertically above the end 54 attached to the inertial body 13b of each second rod-shaped member 52, as shown in Figures 5, 8, and 9. Figure 8 is a view of the second connecting member 51 and the inertial body 13b as viewed in the negative direction of the Z axis. Figure 9 is a view of the second connecting member 51 and the inertial body 13c as viewed in the positive direction of the Z axis. In detail, the end 54 is positioned offset from the end 53 in the first direction D1 and the centripetal direction.

The ends 53 of the second rod-shaped members 52 are preferably positioned at equal intervals in the circumferential direction around the rotation axis AX1. In the second embodiment, the ends 53 of the second rod-shaped members 52 are positioned at equal intervals on a circumference C7 of radius L7 centered on the rotation axis AX1 on a plane perpendicular to the rotation axis AX1, specifically, on the surface 15c of the inertial body 13c. The ends 54 of the second rod-shaped members 52 are preferably positioned at equal intervals in the circumferential direction around the rotation axis AX1. In the second embodiment, the ends 54 of the second rod-shaped members 52 are positioned at equal intervals on a circumference C8 of radius L8 centered on the rotation axis AX1 on a plane perpendicular to the rotation axis AX1, specifically, on the surface 14b of the inertial body 13b. By making the radius L8 smaller than the radius L7, the distance between the end 54 and the rotation axis AX1 becomes shorter than the distance between the end 53 and the rotation axis AX1.

As described above, in order to apply a reaction force to the inertial bodies 13b and 13c, it is preferable that each second rod-shaped member 52 is formed of a material with high axial rigidity, such as iron or stainless steel. In order to displace the inertial bodies 13b and 13c around the rotation axis AX1 by the reaction force applied to the inertial bodies 13b and 13c, it is preferable that the shear rigidity and bending rigidity of each second rod-shaped member 52 are small. Therefore, it is preferable that each second rod-shaped member 52 is formed of a wire bundle formed by bundling together multiple wires formed of a material with high axial rigidity.

For example, each second rod-shaped member 52 is inserted into a hole formed in surface 14b of inertial body 13b and a hole formed in surface 15c of inertial body 13c, and attached to inertial bodies 13b, 13c by a method such as welding, bonding with an adhesive, or fastening with a fastening member.

The operation of the vibration isolation device 2 having the above configuration is described below using as an example a case where the vibration of the vibration source 12 narrows the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 compared to the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 when no vibration of the vibration source 12 is occurring.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the target object 11 becomes narrower, a force from each first rod member 22 toward the inertial body 13a acts on the inertial body 13a, as in the first embodiment. The force acting on the inertial body 13a is represented by a tangential force F1 that displaces the inertial body 13a in the first direction D1, and a centripetal force F2.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the target object 11 becomes narrower, a force from each first rod member 32 toward the inertial body 13b acts on the inertial body 13b, as in the first embodiment. The force acting on the inertial body 13b is represented by a tangential force F3 that displaces the inertial body 13a in the first direction D1, and a centripetal force F4.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 becomes narrow, a force acts on the second connecting member 41 shown in FIG. 5 to shrink the second connecting member 41. Specifically, a force acts on each second rod-shaped member 42 of the second connecting member 41 in a direction to shrink each second rod-shaped member 42. In response to this, each second rod-shaped member 42 applies a reaction force to the inertial bodies 13a and 13c. In detail, a force from each second rod-shaped member 42 toward the inertial bodies 13a and 13c acts on the inertial bodies 13a and 13c. The force acting on the inertial body 13a is represented by a tangential force F5 that displaces the inertial body 13a in the first direction D1, and a centripetal force F6, as shown by the solid arrows in FIG. 6. The forces acting on the inertial body 13c are represented by a tangential force F7 that displaces the inertial body 13c in the second direction D2, and an eccentric force F8, as indicated by dotted arrows in FIG.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 becomes narrow, a force acts on the second connecting member 51 shown in FIG. 5 to shrink the second connecting member 51. Specifically, a force acts on each second rod-shaped member 52 of the second connecting member 51 in a direction to shrink each second rod-shaped member 52. In response to this, each second rod-shaped member 52 applies a reaction force to the inertial bodies 13b and 13c. In detail, a force from each second rod-shaped member 52 toward the inertial bodies 13b and 13c acts on the inertial bodies 13b and 13c. The force acting on the inertial body 13b is represented by a tangential force F9 that displaces the inertial body 13b in the first direction D1, and a centripetal force F10, as shown by the solid arrow in FIG. 8. The forces acting on the inertial body 13c are represented by a tangential force F11 that displaces the inertial body 13c in the second direction D2, and an eccentric force F12, as indicated by dotted arrows in FIG.

Because tangential forces F1 and F5 act on inertial body 13a, inertial body 13a is displaced in the first direction D1. Because tangential forces F3 and F9 act on inertial body 13b, inertial body 13b is displaced in the first direction D1. Because tangential forces F7 and F11 act on inertial body 13c, inertial body 13c is displaced in the second direction D2. In other words, the first connecting members 21 and 31 and the second connecting members 41 and 51 provided in the vibration isolation device 2 operate as a mechanism that converts the translational displacement in the Z-axis direction between the object 11 and the vibration source 12 into a rotational displacement in the circumferential direction around the rotation axis AX1 of the inertial body 13.

On the other hand, when the vibration of the vibration source 12 causes the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 to become wider than the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 when the vibration of the vibration source 12 is not occurring, a force acts on the inertial body 13a, pulling the inertial body 13a toward each of the first rod-shaped members 22, as in the first embodiment. The force acting on the inertial body 13a is represented by a tangential force F1' that displaces the inertial body 13a in the second direction D2, and an eccentric force F2'.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the target object 11 becomes wider, a force from each first rod member 32 toward the inertial body 13b acts on the inertial body 13b, as in the first embodiment. The force acting on the inertial body 13b is represented by a tangential force F3' that displaces the inertial body 13b in the second direction D2, and an eccentric force F4'.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 becomes wider, a force that stretches the second connecting member 41 shown in FIG. 5 acts on the second connecting member 41. Specifically, a force in a direction that stretches each second rod-shaped member 42 acts on each second rod-shaped member 42 of the second connecting member 41. In response to this, each second rod-shaped member 42 applies a reaction force to the inertial bodies 13a and 13c. In detail, a force that pulls the inertial bodies 13a and 13c toward each second rod-shaped member 42 acts on the inertial bodies 13a and 13c. The force acting on the inertial body 13a is a force in the opposite direction to the force F5, as shown by the dotted arrow in FIG. 6, and is represented by a tangential force F5' that displaces the inertial body 13a in the second direction D2, and an eccentric force F6'. The forces acting on the inertial body 13c are represented by a tangential force F7' that displaces the inertial body 13c in the first direction D1, and a centripetal force F8' that acts in the opposite direction to the force F7, as shown by the solid arrows in Figure 7.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 becomes wider, a force that stretches the second connecting member 51 shown in FIG. 5 acts on the second connecting member 51. Specifically, a force in a direction that stretches each second rod-shaped member 52 acts on each second rod-shaped member 52 of the second connecting member 51. In response to this, each second rod-shaped member 52 applies a reaction force to the inertial bodies 13b and 13c. In detail, a force that pulls the inertial bodies 13b and 13c toward each second rod-shaped member 52 acts on the inertial bodies 13b and 13c. The force acting on the inertial body 13b is a force in the opposite direction to the force F9, as shown by the dotted arrow in FIG. 8, and is represented by a tangential force F9' that displaces the inertial body 13b in the second direction D2, and an eccentric force F10'. The forces acting on the inertial body 13c are represented by a tangential force F11' that displaces the inertial body 13c in the first direction D1, and a centripetal force F12' that acts in the opposite direction to the force F11, as shown by the solid arrows in Figure 9.

Because tangential forces F1' and F5' act on inertial body 13a, inertial body 13a is displaced in the second direction D2. Because tangential forces F3' and F9' act on inertial body 13b, inertial body 13b is displaced in the second direction D2. Because tangential forces F7' and F11' act on inertial body 13c, inertial body 13c is displaced in the first direction D1. In other words, the first connecting members 21 and 31 and the second connecting members 41 and 51 provided in the vibration isolation device 2 operate as a mechanism that converts the translational displacement in the Z-axis direction between the object 11 and the vibration source 12 into a rotational displacement in the circumferential direction around the rotation axis AX1 of the inertial body 13.

As in embodiment 1, the apparent inertial force of inertial bodies 13a, 13b, and 13c as viewed from vibration source 12 increases due to losses that occur during the conversion of translational displacement into rotational displacement, in other words, the conversion from translational kinetic energy to rotational kinetic energy.

As described above, the first connecting members 21, 31 and the second connecting members 41, 51 provided in the vibration isolation device 2 according to embodiment 2 operate as a mechanism that converts the translational displacement in the Z-axis direction between the object 11 and the vibration source 12 into a rotational displacement in the circumferential direction around the rotation axis AX1 of the inertial bodies 13a, 13b, 13c. As a result, the apparent inertial force of the inertial bodies 13a, 13b, 13c as seen from the vibration source 12 increases, and the vibration transmitted from the vibration source 12 to the object 11 is reduced. The vibration isolation device 2 has higher vibration isolation performance than the vibration isolation device 1, since it is provided with three inertial bodies 13a, 13b, 13c.

(Embodiment 3)
The configuration of the second connecting member is not limited to the example of embodiment 2. The vibration isolation apparatus 3 shown in Fig. 10 will be described below, focusing on the differences from the vibration isolation apparatus 2 according to embodiment 2.

The vibration isolation device 3 comprises a second connecting member 61 attached to the inertial bodies 13a, 13c and displaces the inertial bodies 13a, 13c around the rotation axis AX1 in response to the relative displacement between the object 11 and the vibration source 12, and a second connecting member 71 attached to the inertial bodies 13b, 13c and displaces the inertial bodies 13b, 13c around the rotation axis AX1 in response to the relative displacement between the object 11 and the vibration source 12.

The second connecting members 61, 71 are attached to two of the inertial bodies 13a, 13b, and 13c that are adjacent to each other. The distance between the rotation axis AX1 and the portion of the second connecting member 61, 71 attached to the inertial body closer to the center of the arrangement direction of the two inertial bodies is shorter than the distance between the rotation axis AX1 and the portion of the second connecting member 61, 71 attached to the inertial body closer to the center of the arrangement direction of the two inertial bodies.

In detail, the second connecting member 61 is attached to the surface 15a of the inertial body 13a facing the inertial body 13c and the surface 14c of the inertial body 13c facing the inertial body 13a, and supports the inertial body 13c. The distance between the part of the second connecting member 61 attached to the inertial body 13c and the rotation axis AX1 is shorter than the distance between the part of the second connecting member 61 attached to the inertial body 13a and the rotation axis AX1.

In the third embodiment, the second connection member 61 is formed of a plurality of second rod-shaped members 62, specifically, three second rod-shaped members 62, attached to the surfaces 15a and 14c. Each second rod-shaped member 62 applies a reaction force to the inertial bodies 13a and 13c in response to a force acting on each second rod-shaped member 62 due to the relative displacement between the object 11 and the vibration source 12. In the third embodiment, each second rod-shaped member 62 is formed of a rod-shaped member extending from the inertial body 13a to the inertial body 13c. Due to the relative displacement between the object 11 and the vibration source 12, a force in the extension direction of each second rod-shaped member 62 acts on each second rod-shaped member 62. In response to this, each second rod-shaped member 62 applies a reaction force in the extension direction to the inertial bodies 13a and 13c.

In order to displace the inertial bodies 13a and 13c around the rotation axis AX1 by the reaction force applied by each second rod-shaped member 62 to the inertial bodies 13a and 13c, as shown in Figures 10, 11, and 12, the end 63 attached to the inertial body 13c of each second rod-shaped member 62 is positioned vertically below the end 64 attached to the inertial body 13a of each second rod-shaped member 62. Figure 11 is a view of the second connecting member 61 and the inertial body 13a viewed in the positive direction of the Z axis. Figure 12 is a view of the second connecting member 61 and the inertial body 13c viewed in the negative direction of the Z axis. In detail, the end 63 is positioned offset from the end 64 in both the first direction D1 and the centripetal direction.

The ends 63 of the second rod-shaped members 62 are preferably positioned at equal intervals in the circumferential direction around the rotation axis AX1. In the third embodiment, the ends 63 of the second rod-shaped members 62 are positioned at equal intervals on a circumference C9 of radius L9 centered on the rotation axis AX1 on a plane perpendicular to the rotation axis AX1, specifically, on the surface 14c of the inertial body 13c. The ends 64 of the second rod-shaped members 62 are preferably positioned at equal intervals in the circumferential direction around the rotation axis AX1. In the third embodiment, the ends 64 of the second rod-shaped members 62 are positioned at equal intervals on a circumference C10 of radius L10 centered on the rotation axis AX1 on a plane perpendicular to the rotation axis AX1, specifically, on the surface 15a of the inertial body 13a. By making the radius L9 smaller than the radius L10, the distance between the end 63 and the rotation axis AX1 becomes shorter than the distance between the end 64 and the rotation axis AX1.

As described above, in order to apply a reaction force to the inertial bodies 13a, 13c, it is preferable that each second rod-shaped member 62 is formed of a material with high axial rigidity, such as iron, stainless steel, etc. In order to displace the inertial bodies 13a, 13c around the rotation axis AX1 by the reaction force applied to the inertial bodies 13a, 13c, it is preferable that each second rod-shaped member 62 has small shear rigidity and bending rigidity. Therefore, it is preferable that each second rod-shaped member 62 is formed of a wire bundle formed by bundling together multiple wires formed of a material with high axial rigidity.

For example, each second rod-shaped member 62 is inserted into a hole formed in surface 15a of inertial body 13a and a hole formed in surface 14c of inertial body 13c, and is attached to inertial bodies 13a, 13c by a method such as welding, bonding with an adhesive, or fastening with a fastening member.

10, the second connecting member 71 is attached to the surface 14b of the inertial body 13b facing the inertial body 13c and the surface 15c of the inertial body 13c facing the inertial body 13b, and supports the inertial body 13c. The distance between the part of the second connecting member 71 attached to the inertial body 13c and the rotation axis AX1 is shorter than the distance between the part of the second connecting member 71 attached to the inertial body 13b and the rotation axis AX1.

In the third embodiment, the second connection member 71 has a plurality of second rod-shaped members 72, specifically, three second rod-shaped members 72, attached to the surfaces 14b and 15c. Each second rod-shaped member 72 applies a reaction force to the inertial bodies 13b and 13c in response to a force acting on each second rod-shaped member 72 due to the relative displacement between the object 11 and the vibration source 12. In the third embodiment, each second rod-shaped member 72 is formed of a rod-shaped member extending from the inertial body 13b to the inertial body 13c. Due to the relative displacement between the object 11 and the vibration source 12, a force in the extension direction of each second rod-shaped member 72 acts on each second rod-shaped member 72. In response to this, each second rod-shaped member 72 applies a reaction force in the extension direction to the inertial bodies 13b and 13c.

In order to displace the inertial bodies 13b, 13c around the rotation axis AX1 by the reaction force applied by each second rod-shaped member 72 to the inertial bodies 13b, 13c, as shown in Figures 10, 13, and 14, the end 73 attached to the inertial body 13c of each second rod-shaped member 72 is positioned vertically above the end 74 attached to the inertial body 13b of each second rod-shaped member 72. Figure 13 is a view of the second connecting member 71 and the inertial body 13b as viewed in the negative direction of the Z axis. Figure 14 is a view of the second connecting member 71 and the inertial body 13c as viewed in the positive direction of the Z axis. In detail, the end 73 is positioned offset from the end 74 in the first direction D1 and the centripetal direction.

It is preferable that the ends 73 of the second rod-shaped members 72 are positioned at equal intervals in the circumferential direction around the rotation axis AX1. In the third embodiment, the ends 73 of the second rod-shaped members 72 are positioned at equal intervals on a circumference C11 of radius L11 centered on the rotation axis AX1 on a plane perpendicular to the rotation axis AX1, specifically, on the surface 15c of the inertial body 13c. It is preferable that the ends 74 of the second rod-shaped members 72 are positioned at equal intervals in the circumferential direction around the rotation axis AX1. In the third embodiment, the ends 74 of the second rod-shaped members 72 are positioned at equal intervals on a circumference C12 of radius L12 centered on the rotation axis AX1 on a plane perpendicular to the rotation axis AX1, specifically, on the surface 14b of the inertial body 13b. By making the radius L11 smaller than the radius L12, the distance between the end 73 and the rotation axis AX1 becomes shorter than the distance between the end 74 and the rotation axis AX1.

As described above, in order to apply a reaction force to the inertial bodies 13b and 13c, it is preferable that each second rod-shaped member 72 is formed of a material with high axial rigidity, such as iron or stainless steel. In order to displace the inertial bodies 13b and 13c around the rotation axis AX1 by the reaction force applied to the inertial bodies 13b and 13c, it is preferable that the shear rigidity and bending rigidity of each second rod-shaped member 72 are small. Therefore, it is preferable that each second rod-shaped member 72 is formed of a wire bundle formed by bundling together multiple wires formed of a material with high axial rigidity.

For example, each second rod-shaped member 72 is inserted into a hole formed in surface 14b of inertial body 13b and a hole formed in surface 15c of inertial body 13c, and is attached to inertial bodies 13b, 13c by a method such as welding, bonding with an adhesive, or fastening with a fastening member.

The operation of the vibration isolation device 3 having the above configuration is described below using as an example a case where the vibration of the vibration source 12 narrows the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 compared to the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 when no vibration of the vibration source 12 is occurring.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the target object 11 becomes narrower, a force from each first rod member 22 toward the inertial body 13a acts on the inertial body 13a, as in the first embodiment. The force acting on the inertial body 13a is represented by a tangential force F1 that displaces the inertial body 13a in the first direction D1, and a centripetal force F2.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the target object 11 becomes narrower, a force from each first rod member 32 toward the inertial body 13b acts on the inertial body 13b, as in the first embodiment. The force acting on the inertial body 13b is represented by a tangential force F3 that displaces the inertial body 13a in the first direction D1, and a centripetal force F4.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 becomes narrow, a force that shrinks the second connecting member 61 shown in FIG. 10 acts on the second connecting member 61. Specifically, a force in a direction that shrinks each second rod-shaped member 62 acts on each second connecting member 61. In response, each second rod-shaped member 62 applies a reaction force to the inertial bodies 13a and 13c. In detail, a force from each second rod-shaped member 62 toward the inertial bodies 13a and 13c acts on the inertial bodies 13a and 13c. The force acting on the inertial body 13a is represented by a tangential force F13 that displaces the inertial body 13a in the second direction D2, and an eccentric force F14, as shown by the dotted arrow in FIG. 11. The forces acting on the inertial body 13c are represented by a tangential force F15 that displaces the inertial body 13c in the first direction D1, and a centripetal force F16, as indicated by solid arrows in FIG.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 becomes narrow, a force acts on the second connecting member 71 shown in FIG. 10 to shrink the second connecting member 71. Specifically, a force acts on each second rod-shaped member 72 of the second connecting member 71 in a direction to shrink each second rod-shaped member 72. In response to this, each second rod-shaped member 72 applies a reaction force to the inertial bodies 13b and 13c. In detail, a force from each second rod-shaped member 72 toward the inertial bodies 13b and 13c acts on the inertial bodies 13b and 13c. The force acting on the inertial body 13b is represented by a tangential force F17 that displaces the inertial body 13b in the second direction D2, and an eccentric force F18, as shown by the dotted arrow in FIG. 13. The forces acting on the inertial body 13c are represented by a tangential force F19 that displaces the inertial body 13c in the first direction D1, and a centripetal force F20, as indicated by solid arrows in FIG.

Tangential force F1 acts on inertial body 13a, displacing inertial body 13a in first direction D1, and tangential force F13 acts on inertial body 13a in second direction D2. The distance between end 23 on which force F1 acts and rotation axis AX1 is shorter than the distance between end 64 on which force F13 acts and rotation axis AX1. Therefore, the moment of force F13 is greater than the moment of force F1. As a result, inertial body 13a is displaced in second direction D2.

Tangential force F3 acts on inertial body 13b, displacing inertial body 13b in the first direction D1, and tangential force F17 acts on inertial body 13b in the second direction D2. The distance between end 33, on which force F3 acts, and rotation axis AX1 is shorter than the distance between end 74, on which force F17 acts, and rotation axis AX1. Therefore, the moment of force F17 is greater than the moment of force F3. As a result, inertial body 13b is displaced in the second direction D2. Tangential forces F15 and F19 act on inertial body 13c, displacing inertial body 13c in the first direction D1. Therefore, inertial body 13c is displaced in the first direction D1. In other words, the first connecting members 21, 31 and the second connecting members 61, 71 provided in the vibration isolation device 3 operate as a mechanism that converts the translational displacement in the Z-axis direction between the object 11 and the vibration source 12 into a rotational displacement in the circumferential direction around the rotation axis AX1 of the inertial body 13.

On the other hand, when the vibration of the vibration source 12 causes the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 to become wider than the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 when the vibration of the vibration source 12 is not occurring, a force acts on the inertial body 13a, pulling the inertial body 13a toward each of the first rod-shaped members 22, as in the first embodiment. The force acting on the inertial body 13a is represented by a tangential force F1' that displaces the inertial body 13a in the second direction D2, and an eccentric force F2'.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the target object 11 becomes wider, a force acts on the inertial body 13b, pulling the inertial body 13b toward each of the first rod-shaped members 32, as in the first embodiment. The force acting on the inertial body 13b is represented by a tangential force F3' that displaces the inertial body 13b in the second direction D2, and an eccentric force F4'.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 becomes wider, a force that stretches the second connecting member 61 shown in FIG. 10 acts on the second connecting member 61. Specifically, a force in a direction that stretches each second rod-shaped member 62 acts on each second rod-shaped member 62 of the second connecting member 61. In response to this, each second rod-shaped member 62 applies a reaction force to the inertial bodies 13a and 13c. In detail, a force that pulls the inertial bodies 13a and 13c toward each second rod-shaped member 62 acts on the inertial bodies 13a and 13c. The force acting on the inertial body 13a is a force in the opposite direction to the force F13, as shown by the solid arrow in FIG. 11, and is represented by a tangential force F13' that displaces the inertial body 13a in the first direction D1, and a centripetal force F14'. The forces acting on the inertial body 13c are represented by a tangential force F15' that displaces the inertial body 13c in the second direction D2, and an eccentric force F16' that acts in the opposite direction to the force F15, as shown by the dotted arrows in Figure 12.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 becomes wider, a force that stretches the second connecting member 71 shown in FIG. 10 acts on the second connecting member 71. Specifically, a force in a direction that stretches each second rod-shaped member 72 acts on each second rod-shaped member 72 of the second connecting member 71. In response to this, each second rod-shaped member 72 applies a reaction force to the inertial bodies 13b and 13c. In detail, a force that pulls the inertial bodies 13b and 13c toward each second rod-shaped member 72 acts on the inertial bodies 13b and 13c. The force acting on the inertial body 13b is a force in the opposite direction to the force F17, as shown by the solid arrow in FIG. 13, and is represented by a tangential force F17' that displaces the inertial body 13b in the first direction D1, and a centripetal force F18'. The forces acting on the inertial body 13c are represented by a tangential force F19' that displaces the inertial body 13c in the second direction D2, and an eccentric force F20', which are opposite to the force F19, as shown by the dotted arrows in Figure 14.

A tangential force F1' that displaces the inertial body 13a in the second direction D2 and a tangential force F13' that displaces the inertial body 13a in the first direction D1 act on the inertial body 13a. The distance between the end 23 on which the force F1' acts and the rotation axis AX1 is shorter than the distance between the end 64 on which the force F13' acts and the rotation axis AX1. Therefore, the moment of the force F13' is greater than the moment of the force F1'. As a result, the inertial body 13a is displaced in the first direction D1.

Tangential force F3' acts on inertial body 13b, displacing inertial body 13b in the second direction D2, and tangential force F17' acts on inertial body 13b in the first direction D1. The distance between end 33 on which force F3' acts and rotation axis AX1 is shorter than the distance between end 74 on which force F17' acts and rotation axis AX1. Therefore, the moment of force F17' is greater than the moment of force F3'. As a result, inertial body 13b is displaced in the first direction D1. Tangential forces F15' and F19' act on inertial body 13c, displacing inertial body 13c in the second direction D2. Therefore, inertial body 13c is displaced in the second direction D2. In other words, the first connecting members 21, 31 and the second connecting members 61, 71 provided in the vibration isolation device 3 operate as a mechanism that converts the translational displacement in the Z-axis direction between the object 11 and the vibration source 12 into a rotational displacement in the circumferential direction around the rotation axis AX1 of the inertial body 13.

As in embodiment 1, the apparent inertial force of inertial bodies 13a, 13b, and 13c as viewed from vibration source 12 increases due to losses that occur during the conversion of translational displacement into rotational displacement, in other words, the conversion from translational kinetic energy to rotational kinetic energy.

As described above, the first connecting members 21, 31 and the second connecting members 61, 71 provided in the vibration isolation device 3 according to embodiment 3 operate as a mechanism that converts the translational displacement in the Z-axis direction between the object 11 and the vibration source 12 into a rotational displacement in the circumferential direction around the rotation axis AX1 of the inertial bodies 13a, 13b, 13c. As a result, the apparent inertial force of the inertial bodies 13a, 13b, 13c as seen from the vibration source 12 increases, and the vibration transmitted from the vibration source 12 to the object 11 is reduced. The vibration isolation device 2 has higher vibration isolation performance than the vibration isolation device 1 because it is provided with three inertial bodies 13a, 13b, 13c.

(Embodiment 4)
Any number of first connecting members 21, 31 may be attached to each of the surface 11a of the object 11 and the surface 12a of the vibration source 12. The vibration isolation device in which a plurality of first connecting members are attached to each of the surface 11a of the object 11 and the surface 12a of the vibration source 12 will be described below, focusing on the differences from the vibration isolation device 1 according to the first embodiment.

15, the vibration isolation device 4 according to the fourth embodiment includes inertial bodies 131, 132, 133, and 134 that are displaceable around rotation axes AX1, AX2, AX3, and AX4, respectively. The rotation axes AX1, AX2, AX3, and AX4 are parallel to each other.

The vibration isolation device 4 further includes a first connection member 211 attached to the object 11 and the inertial body 131, a first connection member 212 attached to the object 11 and the inertial body 132, a first connection member 213 attached to the object 11 and the inertial body 133, and a first connection member 214 attached to the object 11 and the inertial body 134. The first connection members 211, 212, 213, and 214 are attached to the object 11 at positions spaced apart from one another on the surface 11a of the object 11.

The vibration isolation device 4 further includes a first connection member 311 attached to the vibration source 12 and the inertial body 131, a first connection member 312 attached to the vibration source 12 and the inertial body 132, a first connection member 313 attached to the vibration source 12 and the inertial body 133, and a first connection member 314 attached to the vibration source 12 and the inertial body 134. The first connection members 311, 312, 313, and 314 are attached to the vibration source 12 at positions spaced apart from one another on the surface 12a of the vibration source 12.

The shape and material of the inertial bodies 131, 132, 133, 134 are the same as the inertial body 13 provided in the vibration isolation device 1 according to embodiment 1. The structure of the first connecting members 211, 212, 213, 214 is the same as the first connecting member 21 provided in the vibration isolation device 1 according to embodiment 1. The structure of the first connecting members 311, 312, 313, 314 is the same as the first connecting member 31 provided in the vibration isolation device 1 according to embodiment 1.

Similar to the first connecting member 21, the first connecting members 211, 212, 213, and 214 displace the inertial bodies 131, 132, 133, and 134 around the rotation axes AX1, AX2, AX3, and AX4 in response to the relative displacement between the object 11 and the vibration source 12. Similar to the first connecting member 31, the first connecting members 311, 312, 313, and 314 displace the inertial bodies 131, 132, 133, and 134 around the rotation axes AX1, AX2, AX3, and AX4 in response to the relative displacement between the object 11 and the vibration source 12.

As described above, the first connecting members 211, 212, 213, 214, 311, 312, 313, 314 provided in the vibration isolation device 4 according to embodiment 4 operate as a mechanism that converts the translational displacement in the Z-axis direction between the object 11 and the vibration source 12 into a rotational displacement in the circumferential direction of the inertial body 13. Since multiple first connecting members 211, 212, 213, 214 or multiple first connecting members 311, 312, 313, 314 are attached to each of the surface 11a of the object 11 and the surface 12a of the vibration source 12, it is possible to reduce the vibration transmitted from the vibration source 12 to the object 11 even when the object 11 or the vibration source 12 is large.

The present disclosure is not limited to the above-described embodiments. The above-described embodiments can be combined in any manner. As an example, the vibration isolation device 4 may include second connection members 41, 51 attached between the multiple inertial bodies 13a, 13b, 13c, similar to the vibration isolation device 2. As another example, the vibration isolation device 4 may include second connection members 61, 71 attached between the multiple inertial bodies 13a, 13b, 13c, similar to the vibration isolation device 3.

The shape of the object 11 is not limited to the above-mentioned example, and may be any shape that can be supported by the vibration isolation device 1. As an example, the surface 11a is not limited to a flat surface, and may be a curved surface or a surface with irregularities.

The shape of the vibration source 12 is not limited to the above example, and may be any shape on which the vibration isolation device 1 can be installed. As an example, the surface 12a is not limited to a flat surface, and may be a curved surface or a surface with irregularities. If at least one of the surfaces 11a and 12a is not a flat surface, the extension direction of the line segment connecting the surfaces 11a and 12a at the shortest distance is the direction in which the object 11 and the vibration source 12 face each other.

The inertial body 13 may be formed from multiple members. As an example, the inertial body 13 may be formed by attaching a high-density member to the outer surface of a cylinder formed from a low-density member such as aluminum or resin.

The shape of the inertial body 13 is not limited to the above example. As an example, the inertial body 13 may be formed of a columnar member having a cross-sectional shape perpendicular to the rotation axis AX1 in the shape of a ring. In this case, it is possible to increase the moment of inertia with the same mass. As another example, the inertial body 13 may be formed of a rectangular column, a sphere, a hollow cylinder, etc.

The number of inertial bodies 13a, 13b, and 13c provided in the vibration isolation devices 2 and 3 is not limited to three and is arbitrary.

The rotation axis of the inertial body 13 does not have to be parallel to the Z-axis. As an example, the vibration isolation device 5 shown in Fig. 16 includes an inertial body 16 displaceable around a rotation axis AX5 parallel to the X-axis, an elastic member 17 attached to the object 11 and the vibration source 12 to support the object 11, and first connecting members 81, 91 attached to the object 11 or the vibration source 12 and the inertial body 16.

Specifically, the inertial body 16 has a cylindrical shape with protrusions to which the first connecting members 81 and 91 are attached. The inertial body 16 is displaceable in a first direction D1 or a second direction D2 around the rotation axis AX5.

The first connecting member 81 is attached to the surface 11a of the object 11 facing the vibration source 12 and to the protrusion of the inertial body 16. In the example of FIG. 16, the first connecting member 81 is formed of a pair of first rod-shaped members 82 attached to the surface 11a and the protrusion of the inertial body 16. Each first rod-shaped member 82 applies a reaction force to the object 11 and the inertial body 16 according to the force acting on each first rod-shaped member 82 due to the relative displacement of the object 11 and the vibration source 12. In the first embodiment, each first rod-shaped member 82 is formed of a rod-shaped member extending from the object 11 to the inertial body 16. The extension direction of each first rod-shaped member 82 is in a relationship with the rotation axis AX5 and the twist position. Each first rod-shaped member 82 is formed of a material similar to the first rod-shaped member 22. Due to the relative displacement between the object 11 and the vibration source 12, a force in the extension direction of each first rod-shaped member 82 acts on each first rod-shaped member 82. In response to this, each first rod-shaped member 82 applies a reaction force in the extension direction to the object 11 and the inertial body 16.

The first connecting member 91 is attached to the surface 12a of the vibration source 12 facing the object 11 and to the protrusion of the inertial body 16. In the example of FIG. 16, the first connecting member 91 is formed of a pair of first rod-shaped members 92 attached to the surface 12a and the protrusion of the inertial body 16. Each first rod-shaped member 92 applies a reaction force to the vibration source 12 and the inertial body 16 according to the force acting on each first rod-shaped member 92 due to the relative displacement between the object 11 and the vibration source 12. In the first embodiment, each first rod-shaped member 92 is formed of a rod-shaped member extending from the vibration source 12 to the inertial body 16. The extension direction of each first rod-shaped member 92 is in a relationship with the rotation axis AX5 and the twist position. Each first rod-shaped member 92 is formed of a material similar to the first rod-shaped member 32. Due to the relative displacement between the object 11 and the vibration source 12, a force in the extension direction of each first rod-shaped member 92 acts on each first rod-shaped member 92. In response to this, each first rod-shaped member 92 applies a reaction force in the extension direction to the vibration source 12 and the inertial body 16.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 becomes narrower, a force acts on the first connecting member 81 to shrink the first connecting member 81. Specifically, a force acts on each of the first rod-shaped members 82 of the first connecting member 81 in a direction to shrink each of the first rod-shaped members 82. In response to this, each of the first rod-shaped members 82 applies a reaction force to the object 11 and the inertial body 16. In detail, a force from each of the first rod-shaped members 82 toward the object 11 acts on the object 11, and a force from each of the first rod-shaped members 82 toward the inertial body 16 acts on the inertial body 16.

When the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 becomes narrower, a force acts on the first connecting member 91 to shrink the first connecting member 91. Specifically, a force acts on each of the first rod-shaped members 92 of the first connecting member 91 in a direction to shrink each of the first rod-shaped members 92. In response to this, each of the first rod-shaped members 92 applies a reaction force to the object 11 and the inertial body 16. In detail, a force from each of the first rod-shaped members 92 toward the object 11 acts on the object 11, and a force from each of the first rod-shaped members 92 toward the inertial body 16 acts on the inertial body 16.

A force from each of the first rod members 82, 92 toward the inertial body 16 acts on the inertial body 16, displacing the inertial body 16 in a first direction D1. Similarly, when the distance between the surface 12a of the vibration source 12 and the surface 11a of the target object 11 increases, the inertial body 16 is displaced in a second direction D2 opposite to the first direction D1.

The elastic member 17 is formed of a coil spring. The elastic member 17 supports the object 11 and applies a repulsive force to the object 11 and the vibration source 12 in response to the relative displacement between the object 11 and the vibration source 12.

As described above, the first connecting members 81, 91 provided in the vibration isolation device 5 operate as a mechanism that converts the translational displacement in the Z-axis direction between the object 11 and the vibration source 12 into a rotational displacement in the circumferential direction around the rotation axis AX1 of the inertial body 16. The elastic member 17 applies a repulsive force to the object 11 and the vibration source 12 according to the relative displacement between the object 11 and the vibration source 12. These operations reduce the vibration transmitted from the vibration source 12 to the object 11.

The shape of the first connecting members 21, 31 is not limited to the above example. As an example, the distance between at least one of the parts of the first connecting members 21, 31 attached to the inertial body 13 and the rotation axis AX1 may be shorter than the distance between the part of the first connecting members 21, 31 attached to the object 11 or the vibration source 12 and the rotation axis AX1. Specifically, if the distance between the part of the first connecting member 21 attached to the inertial body 13 and the rotation axis AX1 is shorter than the distance between the part of the first connecting member 21 attached to the object 11 and the rotation axis AX1, the distance between the part of the first connecting member 31 attached to the inertial body 13 and the rotation axis AX1 may be the same as the distance between the part of the first connecting member 31 attached to the vibration source 12 and the rotation axis AX1.

17, the first connecting member 21 provided in the vibration isolation device 6 may be formed of a hollow truncated cone 25. It is preferable that a slit 25a is formed in the truncated cone 25. Similarly, the first connecting member 31 may be formed of a hollow truncated cone 35. It is preferable that a slit 35a is formed in the truncated cone 35. By forming the slits 25a, 35a, it is possible to convert the translational displacement in the Z-axis direction of the object 11 and the vibration source 12 into a rotational displacement around the rotation axis AX1 of the inertial body 13.

The first connecting members 21, 31 may be formed integrally. As an example, as shown in FIG. 18, the first connecting member 21 provided in the vibration isolation device 7 may have a coil spring 26. Similarly, the first connecting member 31 may have a coil spring 36. It is preferable that the radius of the coil springs 26, 36 becomes smaller as they approach the inertial body 13. By reducing the radius of the coil springs 26, 36 as they approach the inertial body 13, it is possible to increase the apparent inertial force of the inertial body 13 and further reduce vibration. When the spring winding direction of the coil spring 26 when the inertial body 13 is viewed in the negative direction of the Z axis is the first direction D1, it is preferable that the spring winding direction of the coil spring 26 when the inertial body 13 is viewed in the positive direction of the Z axis is the first direction D1.

The number of first rod-shaped members 22 in the first connecting member 21 and the number of first rod-shaped members 32 in the first connecting member 31 may be different. For example, the first connecting member 21 may have four first rod-shaped members 22, and the first connecting member 31 may have three first rod-shaped members 32. Similarly, the number of second rod-shaped members 42 in the second connecting member 41 and the number of second rod-shaped members 52 in the second connecting member 51 may be different. The same applies to the second connecting members 61 and 71.

The ends 23 of the first rod-shaped member 22 may be positioned at uneven intervals on the circumference C1, and the ends 24 of the first rod-shaped member 22 may be positioned at uneven intervals on the circumference C2. The same applies to the ends 33 and 34 of the first rod-shaped member 32. The same applies to the ends 43, 53, 63, and 73 of the second rod-shaped members 42, 52, 62, and 72, respectively, and the ends 44, 54, 64, and 74 of the second rod-shaped members 42, 52, 62, and 72, respectively.

The end 23 of the first rod member 22 may be provided on the circumference of an ellipse, for example, instead of the circumference C1, and the end 24 of the first rod member 22 may be provided on the circumference of an ellipse, for example, instead of the circumference C2. The same applies to the ends 33 and 34 of the first rod member 32. The same applies to the ends 43, 53, 63, and 73 of the second rod members 42, 52, 62, and 72, respectively, and the ends 44, 54, 64, and 74 of the second rod members 42, 52, 62, and 72, respectively.

In the vibration isolation device 2, the method of attaching each of the second rod-shaped members 42, 52 is not limited to the above example. As an example, the end 44 may be positioned offset from the end 43 in both the second direction D2 and the centripetal direction. In this case, when the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 becomes narrow, the inertial body 13a generates a tangential force that displaces the inertial body 13a in the second direction D2 and a tangential force F3 that displaces the inertial body 13a in the first direction D1. Since the tangential forces in the opposite directions cancel each other out, the rotational force generated in the inertial body 13a is smaller than that in the second embodiment. Even in this case, conversion is performed from the translational displacement in the Z-axis direction between the object 11 and the vibration source 12 to a rotational displacement in the circumferential direction around the rotation axis AX1 of the inertial body 13a, so that the apparent inertial force of the inertial body 13a as seen from the vibration source 12 increases and the vibration transmitted from the vibration source 12 to the object 11 is reduced.

The first rod-shaped members 22, 32, 82, 92 and the second rod-shaped members 42, 52, 62, 72 may be formed of hollow pipes or may be formed of wire bundles formed by twisting and bundling wires.

The first rod-shaped member 22 may be attached to the object 11 and the inertial body 13 in a direction that displaces the inertial body 13 in the second direction D2 when the distance between the surface 12a of the vibration source 12 and the surface 11a of the object 11 becomes narrow. Specifically, the end 23 may be positioned offset from the end 24 in both the second direction D2 and the centripetal direction.

In this case, the first rod-shaped member 32, like the first rod-shaped member 22, may be attached to the vibration source 12 and the inertial body 13 in a direction that displaces the inertial body 13 in the second direction D2 when the distance between the surface 12a of the vibration source 12 and the surface 11a of the target object 11 becomes narrow. Specifically, the end 33 may be positioned offset from the end 34 in both the second direction D2 and the centripetal direction.

Various embodiments and modifications of this disclosure are possible without departing from the broad spirit and scope of this disclosure. Furthermore, the above-described embodiments are intended to explain this disclosure and do not limit the scope of this disclosure. In other words, the scope of this disclosure is indicated by the claims, not the embodiments. Various modifications made within the scope of the claims and within the scope of the disclosure equivalent thereto are deemed to be within the scope of this disclosure.

1, 2, 3, 4, 5, 6, 7 Vibration isolation device, 11 Object, 11a, 12a, 14, 14a, 14b, 14c, 15, 15a, 15b, 15c Surface, 12 Vibration source, 13, 13a, 13b, 13c, 16, 131, 132, 133, 134 Inertial body, 17 Elastic member, 21, 31, 81, 91, 211, 212, 213, 214, 311, 312, 313, 314 First connecting member, 22, 32, 82, 92 First rod-shaped member, 23, 24, 33, 34, 43, 44, 53, 54, 63, 64, 73, 74 End, 25, 35 Circular cone, 25a, 35a Slit, 26, 36 Coil spring, 41, 51, 61, 71 Second connecting member, 42, 52, 62, 72 Second rod-shaped member, AX1, AX2, AX3, AX4, AX5 Rotation axis, C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12 Circumference, D1 First direction, D2 Second direction, F1, F1', F2, F2', F3, F3', F4, F4', F5, F5', F6, F6', F7, F7', F8, F8', F9, F9', F10, F10', F11, F11', F12, F12', F13, F13', F14, F14', F15, F15', F 16, F16', F17, F17', F18, F18', F19, F19', F20, F20' Force, L1, L2, L3, L4, L5, L6, L7, L8, L9, L10, L11, L12 Radius.

Claims (19)

A vibration isolation device that reduces vibration transmitted from a vibration source to an object, comprising:
one or more inertial bodies displaceable about an axis of rotation;
a plurality of first connection members each attached to either the object or the vibration source and the inertial body, and displacing the attached inertial body around the rotation axis in response to a relative displacement between the object and the vibration source caused by vibration of the vibration source;
In at least one of the first connecting members, a distance between a portion of the first connecting member attached to the inertial body and the rotation axis is shorter than a distance between a portion of the first connecting member attached to the target object or the vibration source and the rotation axis.
Vibration isolation device. one end of each of the first connection members is attached to the object or the vibration source, and the other end of each of the first connection members is attached to the inertial body;
Each of the first connection members applies a reaction force to the object or the vibration source and the inertial body to which the first connection member is attached in response to a force acting on the first connection member due to a relative displacement between the object and the vibration source.
2. The vibration isolation device according to claim 1. Each of the first connection members is formed of a rod-shaped member extending from the object or the vibration source to the inertial body.
3. The vibration isolation device according to claim 2. an end portion of each of the first connecting members attached to the inertial body is shifted from an end portion of each of the first connecting members attached to the target object or the vibration source in a first direction which is one of circumferential directions around the rotation axis and in a direction toward the rotation axis;
4. The vibration isolation device according to claim 3. The ends of the first connecting members attached to the inertial bodies are positioned in a plane perpendicular to the rotation axis and equidistantly spaced from each other in a circumferential direction around the rotation axis.
5. The vibration isolation device according to claim 2. The ends of the first connecting members attached to the object or the vibration source are positioned in a plane perpendicular to the rotation axis and equidistantly spaced from each other in a circumferential direction around the rotation axis.
6. The vibration isolation device according to claim 5. Each of the first connection members is formed of a wire bundle.
7. The vibration isolation device according to claim 2. and further comprising one or more second connection members attached to two of the plurality of inertial bodies that are adjacent to each other, and displacing the two attached inertial bodies around the rotation axis in response to a relative displacement between the target object and the vibration source.
The vibration isolation device according to claim 1 . a distance between a portion of the second connecting member attached to the inertial body to which the first connecting member is attached and the rotation axis is shorter than a distance between a portion of the second connecting member attached to the inertial body adjacent to the inertial body and the rotation axis;
9. The vibration isolation device according to claim 8. a distance between the rotation axis and a portion of the second connection member attached to the inertial body of the two inertial bodies that is closer to the center of the arrangement direction of the multiple inertial bodies is shorter than a distance between the rotation axis and a portion of the second connection member attached to the inertial body of the two inertial bodies that is farther from the center of the arrangement direction of the multiple inertial bodies;
9. The vibration isolation device according to claim 8. one end of each of the second connection members is attached to one of the two inertial bodies, and the other end of each of the second connection members is attached to the other of the two inertial bodies;
Each of the second connection members applies a reaction force to the two inertial bodies attached thereto in response to a force acting on the second connection member due to a relative displacement between the object and the vibration source.
11. The vibration isolation apparatus according to claim 8. Each of the second connecting members is formed of a rod-shaped member extending from one of the two inertial bodies to the other of the two inertial bodies.
12. An anti-vibration apparatus according to claim 11. an end portion of each of the second connecting members attached to one of the two inertial bodies is shifted from an end portion of each of the first connecting members attached to the other of the two inertial bodies in a first direction which is one of circumferential directions around the rotation axis and in a direction toward the rotation axis;
13. An anti-vibration apparatus according to claim 12. The end portions of the second connecting members attached to one of the two inertial bodies are positioned in a plane perpendicular to the rotation axis and equidistantly spaced from one another in a circumferential direction around the rotation axis.
14. An anti-vibration apparatus according to claim 11. The end portions of the second connecting members attached to the other of the two inertial bodies are positioned in a plane perpendicular to the rotation axis and equidistantly spaced from each other in a circumferential direction around the rotation axis.
15. An anti-vibration apparatus according to claim 14. Each of the second connection members is formed of a wire bundle.
16. An anti-vibration apparatus according to claim 11. The rotation axis of the one or more inertial bodies extends in a direction in which the object and the vibration source face each other.
17. An anti-vibration apparatus according to claim 1. an elastic member attached to the vibration source and the object, supporting the object, and applying a reaction force to the vibration source and the object in accordance with a relative displacement between the object and the vibration source;
18. An anti-vibration apparatus according to any one of claims 1 to 17. Some of the first connection members among the plurality of first connection members are attached to the object at positions spaced apart from each other,
Among the plurality of first connection members, other of the first connection members are attached to the vibration source at positions spaced apart from each other.
19. An anti-vibration apparatus according to any one of claims 1 to 18.

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