JP7027222B2 - Vibration control device for beams and floors - Google Patents

Description

The present invention relates to a vibration damping device for suppressing vibration caused by movement of a pedestrian or a vehicle with respect to a structure having a large span such as a beam or a floor.

Conventionally, as a vibration damping structure of a large span frame building constructed with a plurality of floors, the one described in Patent Document 1 is known. This vibration damping structure consists of a cane material that is diagonally installed by connecting the lower end to the end side of the beam member or floor member that forms one layer, and the upper end of the cane material and another layer above the one layer. A rotary inertial mass damper and a spring member, which are arranged in series as an additional vibration system and connect a beam member or a floor member of another layer, are provided between them. The period of the additional vibration system is characterized in that it is synchronized with the period of the beam member or the floor member.

Japanese Unexamined Patent Publication No. 2014-169605

Since the conventional vibration damping device needs to be connected to the upper and lower floors through equipment elements in order to form the vibration damping structure portion, there are restrictions on the installation of the device.
Therefore, it is an object of the present invention to provide a vibration damping device having a simple structure without major restrictions on the installation of the device.

Hereinafter, the present invention will be described with reference to the reference numerals of the accompanying drawings, but the present invention is not limited thereto.
In order to solve the above problems, the vibration damping device 1 of the present invention has a first mounting member 2 fixed to the joint surface C1 of the pillar C and the first mounting member 2 parallel to and horizontal to the joint surface C1. A gearbox 5 rotatably supported by the support shaft 4, a passive small gear 6 fixed to the support shaft 4 in the gearbox 5, and a passive small gear 6 fixed to the first mounting member 2 and connected to the support shaft 4. The rotary damper 7 having the rotating shaft 7a, the fixed shaft 8 fixed in the gearbox 5 in parallel with the support shaft 4, and the fixed shaft 8 fixed to the fixed shaft 8 and meshed with the passive small gear 6 to be integrated with the gearbox 5. The drive large gear 9 that revolves around the support shaft 4, the second mounting member 3 that is fixed to the beam B, and the second mounting member 3 on one end side in a predetermined range in the horizontal direction orthogonal to the joint surface C1. A support member 10 that is movably supported, a connecting shaft 12 that is rotatably supported concentrically with the fixed shaft 8 on the other end side of the support member 10, and a gearbox 5 that is rotatably supported by the connecting shaft 12. It is provided with a support arm 11 fixed to the.

In the vibration damping device of the present invention, the damping force is amplified and transmitted to the beam / floor by adopting the gear mechanism and the rotary damper, so that the vibration damping device is small in size, has a large damping effect, and is easy to install.

It is a front view of the vibration damping device which concerns on this invention. It is a right side view of the vibration damping device of FIG. It is a left side view of the vibration damping device of FIG. It is a top view of the vibration damping device of FIG. It is an enlarged sectional view of the connection part with a beam in the vibration damping device of FIG. It is an enlarged left side surface of the connection part with a beam in the vibration damping device of FIG. It is an enlarged plane of the connection part with a beam in the vibration damping device of FIG. It is sectional drawing of the support arm part in the vibration damping device of FIG. It is sectional drawing of the gearbox part in the vibration damping device of FIG. It is a left side view at the time of vibration in the vibration damping device of FIG. It shows another embodiment of the connection part with a beam in the vibration damping device of FIG. 1, (A) is a side view, (B) is a front view. FIG. 1 shows still another embodiment of the connection portion with the beam in the vibration damping device of FIG. 1, in which FIG. 1A is a side view and FIG. 1B is a front view. FIG. 1 shows still another embodiment of the connection portion with the beam in the vibration damping device of FIG. 1, in which FIG. 1A is a side view and FIG. 1B is a front view. It is a top view of the embodiment of the vibration damping device provided with two rotary dampers. It is a schematic explanatory diagram of the vibration damping device of FIG.

Embodiments of the present invention will be described with reference to the drawings.
In FIGS. 1 to 4, the vibration damping device 1 is a vibration damping device for suppressing the vertical vibration of the beam B horizontally connected at one end side with respect to the vertical joint surface C1 of the column C. It is interposed between the pillar C and the beam B. The vibration damping device 1 is connected to the vertical joint surface C1 of the column C on one end side via the first mounting member 2, and the lower surface B1 of the beam B on the other end side.
Is connected via the second mounting member 3.

In FIG. 9, the horizontal support shaft 4 parallel to the joint surface C1 is rotatably supported between the pair of parallel support pieces 2a of the bracket 2 which is the first mounting member. The gearbox 5 is rotatably supported on the support shaft 4 between the support pieces 2a of the bracket 2. In the gearbox 5, the passive small gear 6 is fixed on the support shaft 4. Therefore, the gearbox 5 and the passive small gear 6 are relatively rotatable about the support shaft 4.

As shown in FIG. 9, one end side of the support shaft 4 penetrates one support piece 2a of the bracket 2 and is connected to the rotary shaft 7a of the rotary damper 7 via the coupling 4a. The rotary damper 7 is fixed to the outside of one support piece 2a of the bracket 2.

In the gearbox 5, the fixing shaft 8 is fixed in parallel with the support shaft 4 via the fixing member 5a. A drive large gear 9 that meshes with the passive small gear 6 is fixed on the fixed shaft 8. Therefore, when the gearbox 5 rotates about the support shaft 4 due to the vertical displacement of the connecting shaft 12 (fixed shaft 8) due to the vibration of the beam B, the drive large gear 9 is integrally supported with the gearbox 5. It revolves around the passive small gear 6 around the shaft 4. As a result, the passive small gear 6 is accelerated and rotates on its axis. The rotation of the passive small gear 6 is braked by the rotary damper 7.

In FIGS. 1 and 3, the second mounting member 3 is fixed to the lower surface B1 of the beam B. The second mounting member 3 is connected to the gearbox 5 via the support member 10, the support arm 11, and the connecting shaft 12. Therefore, the gearbox 5 is rotatably supported around the connecting shaft 12 by the second mounting member 3.

As shown in FIGS. 5 and 6, the support member 10 includes a horizontal plate portion 10a extending horizontally to the side of the beam B, a vertical plate portion 10b extending downward from the horizontal plate portion 10a, and the vertical plate. It is provided with a bearing portion 10c fixed so as to horizontally penetrate the portion 10b. The connecting shaft 12 is supported by the bearing portion 10c.

The second mounting member 3 includes a fixing plate portion 3a and a sliding holding portion 3b that receives the horizontal plate portion 10a of the support member 10 between the fixing plate portion 3a. The horizontal plate portion 10a is fixed in the width direction of the beam B by the sliding holding portion 3b, and is movably supported in the longitudinal direction of the beam B within the range of the gap G in FIG.

As shown in FIGS. 1 and 8, the support arm 11 includes a central bearing portion 11a and a pair of arm portions 11b extending parallel to the side surface of the gearbox 5 from the bearing portion 11a, and the ends of the arm portions 11b. At the portion, the connection fitting 11c is fixed to the upper and lower side surfaces of the gearbox 5. As shown in FIG. 9, the bearing portion 11a is arranged on the same axis as the fixed shaft 8 of the gearbox 5, and supports the connecting shaft 12 facing the bearing portion 10c of the support member 10. Therefore, the gearbox 5 is rotatable around the connecting shaft 12 on the same axis as the fixed shaft 8 and is also rotatable around the support shaft 4.

As shown in FIG. 10, when the beam B, which is the object of vibration suppression, vibrates up and down around the joint with the column C, the gearbox 5 vibrates together with the beam B via the support arm 11. Since the gearbox 5 is substantially pivotally supported by the pillar C by the support shaft 4 and pivotally supported by the beam B by the connecting shaft 12, two rotational forces having different turning radii act on the gearbox 5. Become. In order to absorb the rotation deviation due to such a difference in the turning radius, the support member 10 is configured to be movable in the longitudinal direction of the beam B within the range of the gap G in FIG. Therefore, no load (shear force) is generated on the support shaft 4 and the connecting shaft 12.

When the gearbox 5 rotates around the connecting shaft 12 (fixed shaft 8) and around the support shaft 4 due to the vertical vibration of the beam B, the drive large gear 9 is passively integrated with the gearbox 5. It revolves around the small gear 6. Along with this, the passive small gear 6 that meshes with the drive large gear 9 rotates on its axis. The speed of this rotation is increased with respect to the rotation of the gearbox 5 about the support shaft 4. The rotation of the passive small gear 6 is transmitted from the support shaft 4 to the rotary damper 7 via the rotation shaft 7a, and is attenuated by this.

The vibration damping device 1 has a structure in which the rotational movement of the gearbox 5 due to the angular displacement caused by the vibration of the beam B is transmitted to the rotary damper 7 by the gears 6 and 9. A typical structure of the rotary damper 7 is a structure in which the rotation of the shaft is braked by a viscous body or a viscoelastic body. The rotation input to the rotary damper 7 is accelerated by the gear mechanism. Further, the damping force in the rotation direction output by the rotary damper 7 due to the accelerated rotation is amplified by the gear mechanism and transmitted to the beam B. Due to the action of the gear mechanism portion, a more efficient vibration damping effect on the beam B can be obtained as compared with the case where the damper is used alone.

In order to effectively transmit the motion accompanying the vibration of the beam B to the rotary damper 7 between the gears 6 and 9, the gear 9 on the beam B side is fixed to the beam B, and the gear 6 on the rotary damper 7 side is freely rotatable. Will be installed. The gears 6 and 9 are connected by a gearbox 5 as a link (arm).

Although the case where the support member 10 of the vibration damping device 1 is connected to the lower surface B1 of the flange of the beam B has been described above, the connection portion of the support member 10 to the beam B is not limited to this. For example, as shown in FIGS. 11, 12, and 13, the beam B can be installed by being connected to the upper surface of the flange portion, the left and right surfaces of the beam B, or the upper, lower, left, and right surfaces at the same time. Further, if there is no problem such as interference, the damping force can be further improved by arranging the rotary damper 7 not only on one side of the gearbox 5 but also on both sides as shown in FIG.

ω_Ｂ：歯車Aに対する歯車Bの角速度[rad/s]
ｒ_Ｂ：歯車Bのピッチ円半径[m]
ω_Ｃ：歯車Aに対する腕Cの角速度[rad/s]
ｒ_Ａ：歯車Aのピッチ円半径[m]
Ｚ_Ａ：歯車Aの歯数
Ｚ_Ｂ：歯車Bの歯数

Ｍ_Ｂ：歯車Bのモーメント[Nm]
Ｍ_Ｃ：腕Cのモーメント[Nm]
歯車機構により、式３に示すように、ロータリダンパ７が出力する減衰力が増幅されて梁Ｂに伝えられることから、ロータリダンパの小型化も可能となる。

Ｃ：装置の減衰係数[Nm・s/rad]
Ｃ_Ｄ：ロータリダンパの減衰係数[Nm・s/rad] The structure and operation of the vibration damping device 1 will be described with reference to the schematic mechanism explanatory diagram of FIG. Equation 1 shows the relationship between the angular velocity input to the gear mechanism due to the vibration of the beam B in the gear mechanism and the angular velocity output by the gear mechanism. Similarly, Equation 2 shows the relationship between the damping force output by the rotary damper 7 when it is output by the gear mechanism and transmitted to the beam B.

ω _B : Angular velocity of gear B with respect to gear A [rad / s]
r _B : Pitch circle radius of gear B [m]
ω _C : Angular velocity of arm C with respect to gear A [rad / s]
r _A : Pitch circle radius of gear A [m]
Z _A : Number of teeth of gear A Z _B : Number of teeth of gear B

MB: Moment of gear _B [Nm]
MC: Moment of arm _C [Nm]
As shown in Equation 3, the gear mechanism amplifies the damping force output by the rotary damper 7 and transmits it to the beam B, so that the rotary damper can be miniaturized.

C: Attenuation coefficient of the device [Nm ・ s / rad]
CD: _Attenuation coefficient of rotary damper [Nm ・ s / rad]

1 Vibration damping device 2 First mounting member (bracket)
2a Support piece 3 First mounting member 3a Fixing plate part 3b Sliding holding part 4 Support shaft 4a Coupling 5 Gearbox 5a Fixing member 6 Passive small gear 7 Rotary damper 7a Rotating shaft 8 Fixed shaft 9 Drive large gear 10 Support member 10a Water flat plate part 10b Vertical plate part 10c Bearing part 11 Support arm 11a Bearing part 11b Arm part 11c Connection bracket 12 Connecting shaft

Claims (2)

A vibration damping device for suppressing vertical vibration of a beam connected horizontally at one end to the vertical joint surface of the column.
A first mounting member fixed to the joint surface of the column, a gearbox rotatably supported by the first mounting member by a support shaft parallel to the joint surface and horizontal to the joint surface, and the above-mentioned gearbox in the gearbox. A passive small gear fixed to the support shaft, a rotary damper having a rotary shaft fixed to the first mounting member and connected to the support shaft, and a fixing fixed in the gearbox in parallel with the support shaft. A shaft, a drive gear that is fixed to the fixed shaft and meshes with the passive small gear, a second mounting member that is fixed to the beam, and a horizontal one end side of the second mounting member that is orthogonal to the joint surface. A support member movably supported in a predetermined range in a direction, a connecting shaft rotatably supported concentrically with the fixed shaft on the other end side of the support member, and rotatably supported by the connecting shaft. A beam and floor vibration damping device characterized by having a support arm fixed to a gearbox. The support arm is characterized by being rotatably supported by the connecting shaft in a central bearing portion, extending radially from the bearing portion, and being fixed to the outer surface of the gearbox at the outer end portion. The beam and floor vibration damping device according to claim 1.

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