JP6065219B2 - Vibration reduction device - Google Patents

Description

  The present invention is a vibration reduction device that is interposed between two members that vibrate relative to each other and reduces the relative vibration, and particularly uses the inertial force generated by the rotating weight as a reaction force (belonging to a rotary inertial mass mechanism). Relates to the device.

  In recent years, an inertial mass damper is installed between layers of a building, and an inertial mass is added to effectively reduce the response displacement of the building during an earthquake. That is, an inertial mass damper is a device that generates a reaction force proportional to the relative acceleration at both ends, and an inertial mass effect that is several thousand times the actual mass of a rotating weight can be obtained using a ball screw mechanism. It has already been put into practical use in damping buildings.

  In addition, the effect of reducing the response displacement of the seismic isolation layer by applying inertial mass dampers to the seismic isolation building has been confirmed, and the practical application is being studied. On the other hand, when applied to a base-isolated building, simply adding an inertial mass damper to the base-isolated layer increases the response acceleration of the building due to the high-frequency component of the ground motion acting on the building due to the installation of the inertial mass damper. There is a problem of inviting.

  In contrast, the applicant of the present application connected in series an additional spring mechanism that is configured to be able to handle both compressive force and tensile force using a plurality of disc springs, etc., to a rotary inertial mass mechanism that is an inertial mass damper. A patent application has already been filed for the invention of the arranged vibration reducing device (inertial mass damper) (for example, see Patent Document 1). In this vibration reduction device, while effectively reducing the response displacement of the seismic isolation layer by the inertia mass effect by the inertia mass damper, the high frequency component to the building is absorbed by the additional spring connected in series to the inertia mass damper, The response acceleration of the building can be prevented from increasing due to the vibration absorption effect of the additional spring.

JP 2012-189104 A

  However, in the vibration reduction device formed by connecting the rotary inertia mass mechanism and the additional spring mechanism in series, the length can be shortened by using a disc spring as the additional spring, but still, For example, by connecting an additional spring mechanism with a disc spring group in series to a rotary inertia mass mechanism, the overall length becomes considerably large, and in some cases, the length is longer than the span of the seismic isolation layer (column spacing). End up.

  Furthermore, since the vibration reduction device having such a large length is installed by pin joining to the upper and lower building structures with the seismic isolation layer in between, the vibration reduction device is bent or compressed by its own weight. It is conceivable that the linearity cannot be maintained due to buckling deformation sometimes, and as a result, the desired vibration reduction performance cannot be exhibited.

  In view of the above circumstances, the present invention provides a vibration reduction device that combines a rotary inertia mass mechanism with an additional spring mechanism to enable absorption of a high frequency component, and to make the device compact and lightweight. For the purpose.

  In order to achieve the above object, the present invention provides the following means.

The vibration reducing device of the present invention is a vibration reducing device for reducing relative vibration between two members that vibrate relatively, and is configured by connecting a rotary inertia mass mechanism and an additional spring mechanism in series. The mass mechanism includes a ball screw, a ball nut that is screwed to the ball screw, the ball screw is advanced and retracted in the axial direction, is rotatable about the axis, and is immovable about the axis, and the ball A rotary weight attached to the nut and driven to rotate around the axis following the ball nut, and the additional spring mechanism is coaxially arranged between the outer cylinder and the outer cylinder. And an inner cylinder provided between the inner cylinder and the outer surface of the inner cylinder so that the outer cylinder and the inner cylinder are relatively displaced. And return the relative position of the inner cylinder to the initial state. And a spring member for urging the outer tube and / or the inner cylinder in the axial direction, fixed to one end of the inner cylinder into the rotary inertia mass mechanism, is configured by inserting the ball screw to the inner tube And an intermediate support mechanism for supporting an intermediate portion of an apparatus main body formed by connecting the rotary inertia mass mechanism and the additional spring mechanism in series, and the intermediate support mechanism has one end connected to the apparatus main body. A support member extending in a direction perpendicular to the axis, and friction reducing means provided on a contact surface with which the other end of the support member and / or the other end of the support member abuts. It is characterized by.

  In the vibration reducing device of the present invention, when an earthquake occurs and relative vibration occurs between the two members, the ball screw of the rotary inertial mass mechanism advances and retreats in the axial direction accordingly, and the ball nut rotates and rotates. The weight rotates, and an inertial mass effect several thousand times as large as the actual mass of the rotating weight can be obtained. This makes it possible to significantly reduce the response displacement of the seismic isolation layer, for example, by installing this vibration reducing device in the seismic isolation layer of the seismic isolation building where a seismic isolation device such as laminated rubber is installed. .

  In addition, the inertial mass effect is exhibited by the rotary inertial mass mechanism, and the spring member of the additional spring mechanism is contracted so that both the compression force and the tensile force can function as a series spring. As a result, this additional spring mechanism can prevent excessive relative acceleration from acting on the rotating inertial mass mechanism in the high frequency range, so that the response acceleration of the building increases even when applied to a base-isolated building. Can be surely prevented.

  And, in the vibration reducing device of the present invention, even when the rotary inertia mass mechanism and the additional spring mechanism are connected in series, one end of the inner cylinder of the additional spring mechanism is connected to the rotary inertia mass mechanism, Since the ball screw is inserted into the inner cylinder, that is, since the additional spring mechanism and the ball screw of the rotary inertia mass mechanism overlap in the axial direction, the conventional vibration reduction device in which both mechanisms are simply connected in series. Compared to the above, the length of the vibration reducing device can be shortened and made compact.

  Further, in the vibration reducing device of the present invention, the intermediate portion of the device main body composed of the rotary inertia mass mechanism and the additional spring mechanism connected in series is supported by the intermediate support mechanism, so that the overall length is somewhat. Even if the length becomes longer, the vibration reducing device (device main body) is not bent due to its own weight.

  Furthermore, when an earthquake occurs, relative vibration occurs between the two members, and the rotary inertia mass mechanism and the additional spring mechanism operate, the friction reduction means adjusts the intermediate to the behavior of the rotary inertia mass mechanism and the additional spring mechanism. Since the support mechanism moves, the apparatus main body does not buckle even when a compressive force is applied to the vibration reducing apparatus due to an earthquake. That is, the linearity of the apparatus main body can be reliably maintained, and accordingly, desired vibration reduction performance can be reliably exhibited.

  In addition, since the linearity of the ball screw can be maintained by supporting the rotary inertia mass mechanism and the additional spring mechanism by the intermediate support mechanism, a predetermined amount can be obtained even if the ball diameter of the rotary inertia mass mechanism is reduced. Vibration reduction performance can be obtained. Thereby, it is possible to reduce the weight of the vibration reducing device by reducing the components such as the ball screw and the inner cylinder while securing the desired vibration reducing performance.

It is sectional drawing which shows the vibration reduction apparatus which concerns on one Embodiment of this invention. It is the X1-X1 arrow view figure of FIG. FIG. 2 is an X2-X2 arrow view of FIG. 1. It is the X3-X3 line arrow directional view of FIG. It is the X4-X4 arrow line view of FIG. It is sectional drawing which shows the conventional vibration reduction apparatus.

  Hereinafter, a vibration reducing device according to an embodiment of the present invention will be described with reference to FIGS.

The vibration reduction device of the present embodiment is installed in the base isolation layer by pin-bonding both end sides to the upper and lower upper and lower structures with the base isolation layer of the base isolation building interposed therebetween, for example. Used to reduce the relative vibration of two vibrating members.
Note that the vibration reducing device according to the present invention is installed in, for example, a frame surface surrounded by pillars and beams of a building to reduce the relative vibration of two members that vibrate relative to each other due to an earthquake or the like. It may be used as a component of the system.

  As shown in FIGS. 1 and 2 to 5, the vibration reducing apparatus A according to the present embodiment includes a rotary inertia mass mechanism 1, an additional spring mechanism 2, and an intermediate support mechanism 3, and the rotary inertia mass mechanism 1. And the additional spring mechanism 2 are connected in series. Further, in the present embodiment, the apparatus main body 4 (vibration reducing apparatus A) composed of the rotary inertia mass mechanism 1 and the additional spring mechanism 2 connected in series is installed with the axis O1 in the horizontal direction.

  The rotary inertia mass mechanism 1 includes a ball screw 5 provided with a central axis O1 coaxially arranged with the axis O1 of the apparatus main body 4, a ball nut 6 screwed to the ball screw 5, and a ball nut 6. The rotary nut 7 is attached to the ball nut 6 and rotates in accordance with the rotation of the ball nut 6.

  The ball screw 5 has a connecting member 8 such as a ball joint or a clevis attached to one end 5a of the ball screw 5 for connection to a building structure or the like. Further, the other end 5b of the ball screw 5 is attached with a guide plate 9 having a diameter larger than that of the ball screw and a disc-like guide plate 9 with the axis O1 of the ball screw 5 and the center axis of each other being coaxially arranged. .

  A ball nut 6 screwed to the ball screw 5 is supported by a bearing 10. The bearing 10 is connected to one end 12a of the inner cylinder 12 of the additional spring mechanism 2 which will be described in detail later. An annular outer ring 10a that is fixed around the axis O1 so as not to rotate and to move in the direction of the axis O1. An annular inner ring 10b that is disposed in the inner hole of the outer ring 10a and is rotatably supported around the axis O1 is formed. A ball screw 5 is inserted through the center hole of the inner ring 10 b of the bearing 10 and a ball nut 6 is fixed to the inner ring 10 b of the bearing 10. Thereby, the ball nut 6 is disposed so as to be rotatable around the axis O1 and immovable in the direction of the axis O1.

  Further, a rotary weight 7 is integrally fixed to the ball nut 6. The rotary weight 7 is formed, for example, in a substantially cylindrical shape, and is fixedly attached to the ball nut 6 with the ball screw 5 inserted therein and the ball screw 5 and the axis O1 of each other being coaxially arranged.

  Next, the additional spring mechanism 2 is formed in a cylindrical shape with an outer cylinder 11 having a smaller outer diameter than the outer cylinder 11, and the axis O <b> 1 is coaxially arranged inside the outer cylinder 11. An inner cylinder 12 provided in a distributed manner, and an additional spring (spring member) 13 disposed between the outer cylinder 11 and the inner cylinder 12 are configured.

  The outer cylinder 11 is a hollow cylinder having a predetermined length of high-axis rigidity and high bending rigidity, and a disk-shaped connection plate 14 is provided so that the other end 11b (the left end in the figure) is closed. A connecting member 15 such as a ball joint or a clevis for connecting the other end of the vibration reducing device A to a building structure or the like is attached to the connecting plate 14. Further, an annular support plate 16 penetratingly formed around an insertion hole through which the inner cylinder 12 is inserted is fixed to one end 11a side (the end portion on the right side in the figure) of the outer cylinder 11 so as to close the inside. Yes.

  In addition, the outer cylinder 11 is provided on one end 11a side so as to be fixed to the support plate 16, and is a linear guide 17 for guiding the outer cylinder 11 in the direction of the axis O1 relative to the inner cylinder 12 and relatively moving forward and backward. Is provided. Further, the outer cylinder 11 is provided with a convex portion 18 protruding radially inward from the inner surface and extending from the other end 11b toward the one end 11a in the axis O1 direction on the other end 11b side. The convex portion 18 is formed with a length dimension in the direction of the axis O1 according to the stroke amount of the vibration reducing device A.

  The inner cylinder 12 is a hollow cylinder having a predetermined length of high-axis rigidity and high bending rigidity. The inner cylinder 12 is inserted into the insertion hole of the support plate 16 from the other end 12b side and disposed in the outer cylinder 11, and has one end 12a. The side is provided outside the outer cylinder 11. At this time, one end 12a of the inner cylinder 12 is fixed to the outer ring 10a of the bearing 10 that rotatably supports the ball screw 5, and the inner hole of the inner ring 10b and the mutual axis O1 are arranged coaxially. It is provided as such. Further, the inner cylinder 12 has a predetermined interval (an interval defining the stroke amount of the vibration reducing device A) between the other end 12b and the connecting plate 14 fixed to the other end 11b of the outer cylinder 11 in the direction of the axis O1. It is provided and arranged in the outer cylinder 11.

  Further, as shown in FIGS. 1 and 3 to 5, the inner cylinder 12 protrudes radially outward at one end 12 a extending outward from the support plate 16 of the outer cylinder 11 and extends in the direction of the axis O 1. A linear guide rail 19 is provided for engaging the linear guide 17 to guide the outer cylinder 11 in the direction of the axis O1 relative to the inner cylinder 12, and to advance and retreat without relative rotation. Further, a disc-shaped locking plate 20 having a diameter larger than the outer diameter of the inner cylinder 12 and smaller than the inner diameter of the outer cylinder 11 is fixed to the other end 12 b of the inner cylinder 12.

  The inner cylinder 12 has an inner diameter substantially equal to the outer diameter of the inner cylinder 12 on the side of the other end 12 b, and an outer diameter slightly smaller than the inner diameter of the outer cylinder 11. A plate 21 is attached to the center hole through the other end 12b of the inner cylinder 12. As shown in FIGS. 1 and 2, the stroke defining plate 21 includes an outer peripheral roller 21 a that contacts the inner surface of the outer cylinder 11 and an inner peripheral roller 21 b that contacts the outer surface of the inner cylinder 12. The stroke defining plate 21 is provided so as to be capable of moving forward and backward in the direction of the axis O1 relative to the outer cylinder 11 and the inner cylinder 12 by these rollers 21a and 21b. Further, at this time, the stroke defining plate 21 is in contact with one end in the axis O1 direction of the convex portion 18 of the outer cylinder 11, so that the movement toward the other end 11b in the axis O1 direction is restricted with respect to the outer cylinder 11. By making contact with the locking plate 20 of the inner cylinder 12, relative movement of the inner cylinder 12 toward the other end 12 b in the direction of the axis O <b> 1 is restricted.

  Next, the spring member (addition spring) 13 of the additional spring mechanism 2 is provided between the outer surface of the inner cylinder 12 and the inner surface of the outer cylinder 11 and between the stroke defining plate 21 and the support plate 16 in the direction of the axis O1. Yes. In the present embodiment, the spring member 13 is configured by arranging a set of disk spring groups in which a plurality of disk springs are stacked in series in the direction of the plurality of axis lines O1. In FIG. 1, the spring member 13 at the intermediate portion in the axis O1 direction is omitted.

  As a result, a force that presses the stroke defining plate 21 toward the other end in the direction of the axis O1 acts on the stroke defining plate 21 by the urging force of the spring member 13. It is provided so as not to move further to the other end side in the axis O1 direction. Further, in this state, the locking plate 20 provided on the inner cylinder 12 is brought into contact with the stroke defining plate 21.

When the outer cylinder 11 is relatively displaced with respect to the inner cylinder 12 toward one end in the direction of the axis O1, that is, when a compression-side force is applied to the vibration reducing device A, the stroke defining plate is applied to the convex portion 18. 21 is pressed, and the stroke defining plate 21 is relatively displaced toward the one end 12a in the direction of the axis O1 with respect to the inner cylinder 12, and the spring member 13 is contracted. Further, when the outer cylinder 11 is displaced relative to the inner cylinder 12 toward the other end side in the direction of the axis O1, that is, when a tensile force is applied to the vibration reducing device A, a stroke is applied to the locking plate 20. The regulating plate 21 is pressed, and at the same time, the stroke defining plate 21 is relatively displaced toward the one end 11a in the axis O1 direction with respect to the outer cylinder 11, and the spring member 13 is contracted.
Thereby, the additional spring mechanism 2 of this embodiment is comprised so that it can respond | correspond to the external force of both compression force and tension | tensile_strength while the spring member 13 contracts and absorbs external force.

  A cushioning material such as hard rubber is attached to the surface of the stroke defining plate 21 or the support plate 16 that contacts the spring member 13, the inner surface of the outer cylinder 11, or the outer surface of the inner cylinder 12, and noise ( It may be configured to prevent occurrence of mechanical noise) or wear.

  In the vibration reducing device A of the present embodiment, the rotary inertia mass mechanism 1 and the additional spring mechanism 2 configured as described above are arranged so that the other end 5b side of the ball screw 5 of the rotary inertia mass mechanism 1 is connected to the inner cylinder 12. The one end 12a of the inner cylinder 12 is inserted and arranged inside from the one end 12a side, and is detachably fixed to the outer ring 10a of the bearing 10, so that they are integrally connected in a state of being arranged in series. The vibration reducing device A is configured as, for example, a device having an inertial mass of 2500 tons, a burden force of 500 kN, a stroke of ± 600 mm, and a series spring of 4 kN / mm.

  On the other hand, in the vibration reducing apparatus A of the present embodiment, an intermediate support mechanism that supports the apparatus main body 4 including the rotary inertia mass mechanism 1 and the additional spring mechanism 2 that are connected in series with the axis O1 in the horizontal direction. 3 is provided.

  The intermediate support mechanism 3 has one end connected to an intermediate portion of the apparatus main body 4 (vibration reducing apparatus A), in this embodiment, the outer ring 10a of the bearing 10, and is directed downward in a direction (vertical direction) perpendicular to the axis O1. The extended support member 3a and the friction reducing means 3b provided on the contact surface 22 with which the other end of the support member 3a and / or the other end of the support member 3a abut are configured. As the friction reducing means 3b, for example, a sliding material such as a roller, a bearing, or a Teflon (registered trademark) sheet can be applied.

  In the vibration reducing apparatus A of the present embodiment having the above-described configuration, for example, the connecting member 15 on the other end side is connected to the upper structure of the building, the connecting member 8 on one end side is connected to the lower structure, and the direction of the axis O1 is changed. It is installed in the seismic isolation layer in a horizontal direction. At this time, the lower end (the other end) of the intermediate support mechanism 3 contacts the contact surface 22 of the lower structure, and the rotary inertia mass mechanism 1 and the additional spring mechanism 2 connected in series are connected by the intermediate support mechanism 3. Supported.

  When an earthquake occurs and relative vibration (relative displacement) occurs in the upper and lower upper structures and lower structures (two members) with the seismic isolation layer sandwiched therebetween, the ball screw of the rotary inertial mass mechanism 1 is responded accordingly. 5 advances and retreats in the direction of the axis O1, the ball nut 6 supported by the inner ring 10b of the bearing 10 rotates, and the rotating weight 7 rotates. Thereby, an inertial mass effect several thousand times as large as the actual mass of the rotary weight 7 is obtained, and the response displacement of the seismic isolation layer in which the seismic isolation device such as laminated rubber is installed is greatly reduced.

  Further, relative vibration is generated in the upper structure and the lower structure, the inertial mass effect is exhibited by the rotary inertial mass mechanism 1, and the relative vibration also acts on the additional spring mechanism 2. When the compression side force acts on the vibration reducing device A and the outer cylinder 11 is relatively displaced toward the one end side in the axis O1 direction with respect to the inner cylinder 12 of the additional spring mechanism 2, a stroke defining plate is formed on the convex portion 18. 21 is pressed, and the stroke defining plate 21 is relatively displaced toward the one end 12a in the direction of the axis O1 with respect to the inner cylinder 12, and the spring member 13 is contracted. Further, when a tension-side force acts on the vibration reducing device A and the outer cylinder 11 is relatively displaced with respect to the inner cylinder 12 toward the other end side in the axis O1 direction, the stroke defining plate 21 is pressed against the locking plate 20. At the same time, the stroke defining plate 21 is relatively displaced toward the one end 11a in the axis O1 direction with respect to the outer cylinder 11, and the spring member 13 is contracted.

  Thereby, when relative vibration occurs in the upper structure and the lower structure due to the earthquake, the spring member 13 of the additional spring mechanism 2 is contracted, so that part of the displacement is absorbed by both compression and tension. Therefore, the vibration absorbing effect of the additional spring mechanism 2 prevents an excessive force from acting on the superstructure of the base isolation building at a high frequency range, and the case where the rotary inertia mass mechanism 1 is applied to the base isolation building. However, the response acceleration of the building can be reliably prevented from increasing.

  That is, in the vibration reducing apparatus A of the present embodiment, while the effective displacement of the seismic isolation layer is effectively reduced by the inertial mass effect by the rotary inertial mass mechanism 1 as described above, the additional spring mechanism 2 increases the height to the building. An increase in response acceleration of the building can be prevented by a vibration absorption effect that absorbs the frequency component.

  Even in the case where the rotary inertia mass mechanism 1 and the additional spring mechanism 2 are arranged in series and connected integrally, the vibration reducing device A of the present embodiment has the inner cylinder 12 of the additional spring mechanism 2. One end 12a is connected to an outer ring 10a of a bearing 10 that rotatably supports an inner ring 10b that supports the ball screw 5 around the axis O1, and the other end 5b side of the ball screw 5 is inserted into the inner cylinder 12. It is configured. Thereby, for example, as shown in FIG. 6, the ball screw of the additional spring mechanism 2 and the rotary inertia mass mechanism 1 is compared with the conventional vibration reduction device B in which the rotary inertia mass mechanism 1 and the additional spring mechanism 2 are simply connected in series. 5 overlaps in the direction of the axis O1, the length of the vibration reducing device A (device main body portion 4) can be shortened and made compact.

  More specifically, for example, when the vibration reducing device A is configured as a device having an inertial mass of 2500 ton, a load force of 500 kN, a stroke of ± 600 mm, and a series spring of 4 kN / mm, the conventional vibration reducing device B in FIG. In contrast to the length of about 4.7 m, the vibration reducing device A of the present embodiment shown in FIG. 1 has a total length of about 4 m. For this reason, it becomes possible to integrate it easily between normal column spans. That is, if the standard span is 6.4 m and the basic footing width is 2 m, the inner span is 4.4 m. Therefore, the conventional vibration reduction device B is difficult to install, whereas the vibration reduction device A of the present embodiment. Then installation is possible.

  Further, in the vibration reducing apparatus A of the present embodiment, an intermediate portion of the rotary inertia mass mechanism 1 and the additional spring mechanism 2 connected in series is supported by the intermediate support mechanism 3. For this reason, when relative vibration is generated in the upper structure and the lower structure due to the earthquake, and the rotary inertia mass mechanism 1 and the additional spring mechanism 2 are respectively operated, the behavior of the rotary inertia mass mechanism 1 and the additional spring mechanism 2 is adjusted. The intermediate support mechanism 3 moves by the friction reducing means 3b.

 As a result, even if the rotary inertia mass mechanism 1 and the additional spring mechanism 2 are arranged in series and connected together, that is, even if the overall length is increased to some extent, the intermediate portion is supported by the intermediate support mechanism 3. Therefore, the apparatus main body 4 (vibration reducing apparatus A) is not bent due to its own weight.

 Further, since the rotary inertia mass mechanism 1 and the additional spring mechanism 2 connected in series are supported by the intermediate support mechanism 3, the intermediate support mechanism 3 is further added to the rotary inertia mass mechanism 1 by the friction reducing means 3b. By following the behavior of the spring mechanism 2, even if a compressive force acts on the vibration reducing device A due to an earthquake, it will not buckle. That is, linearity can be reliably maintained, and accordingly, desired vibration reduction performance can be reliably exhibited.

  Further, by configuring the intermediate inertia mechanism 3 to support the rotary inertia mass mechanism 1 and the additional spring mechanism 2 in this manner, even if the shaft diameter of the ball screw 5 of the rotary inertia mass mechanism 1 is reduced, a predetermined vibration is achieved. Reduction performance can be obtained. Thereby, it is possible to reduce the weight of the vibration reducing device A by reducing the components such as the ball screw 5, the inner cylinder 12, and the bearing 10 while ensuring the desired vibration reducing performance.

  As mentioned above, although one Embodiment of the vibration reduction apparatus which concerns on this invention was described, this invention is not limited to said one Embodiment, In the range which does not deviate from the meaning, it can change suitably.

  For example, it is not necessary to limit the use of a disc spring as the additional spring (spring member) 13. For example, a coil spring can be used as long as it can be accommodated in the outer cylinder 11 and exhibits equivalent spring rigidity in both compression and tension. Arbitrary spring members such as plate springs and plate springs can be employed.

  In addition to incorporating the additional spring 13 integrally in the outer cylinder 11, an appropriate damping element such as an oil damper may be incorporated in the outer cylinder.

DESCRIPTION OF SYMBOLS 1 Rotation inertia mass mechanism 2 Additional spring mechanism 3 Intermediate support mechanism 3a Support member 3b Friction reduction means 4 Main part 5 Ball screw 5a One end 5b Other end 6 Ball nut 7 Rotating weight 8 Connecting member 9 Guide plate 10 Bearing 10a Outer ring 10b Inner ring 11 outer cylinder 11a one end 11b other end 12 inner cylinder 12a one end 12b other end 13 spring member (addition spring)
14 connecting plate 15 connecting member 16 support plate 17 linear guide 18 convex portion 19 linear guide rail 20 locking plate 21 stroke defining plate 21a outer peripheral roller 21b inner peripheral roller 22 contact surface A vibration reducing device B conventional vibration reducing device O1 axis

Claims (1)

A vibration reducing device for reducing relative vibration between two members that vibrate relatively,
The rotary inertia mass mechanism and the additional spring mechanism are connected in series.
The rotational inertial mass mechanism includes a ball screw, a ball nut screwed to the ball screw, the ball screw that is advanced and retracted in the axial direction, is rotatable about the axis, and is immovable about the axis. A rotating weight attached to the ball nut and provided to be rotatable around the axis following the ball nut;
The additional spring mechanism includes an outer cylinder, an inner cylinder that is coaxially arranged inside the outer cylinder, and that is relatively movable in the axial direction. Provided between the outer surfaces of the cylinder, and when the outer cylinder and the inner cylinder are relatively displaced, the outer cylinder and / or the inner cylinder is urged in the axial direction so as to return the relative position of the outer cylinder and the inner cylinder to the initial state. A spring member,
One end of the inner cylinder is fixed to the rotary inertia mass mechanism, and the ball screw is inserted into the inner cylinder .
And an intermediate support mechanism for supporting an intermediate portion of the apparatus main body formed by connecting the rotary inertia mass mechanism and the additional spring mechanism in series,
The intermediate support mechanism has one end connected to the apparatus main body and a support member extending in a direction perpendicular to the axis, and the other end of the support member and / or the other end of the support member abut against each other. A vibration reducing device comprising: friction reducing means provided on a contact surface .

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