JP2519591Y2 - Vibration control device - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention can be installed on the top of structures such as towers of suspension bridges, skyscrapers, towers, and steel towers to suppress wind load (aerodynamic force) vibrations of these structures and vibration amplitudes due to earthquakes. The present invention relates to a vibration damping device used to damp vibration at an early stage.

[0002]

2. Description of the Related Art As an example of a vibration damping device recently proposed as a vibration damping device of this type, Japanese Patent Application No. Hei 1-163632 is cited.
There is one described in the issue. That is, as shown in FIGS. 3 to 5, a base 2 is provided on the top of a structure 1 that vibrates by receiving an external force, and a vibration damping body is formed on the base 2 in a circular arc shape so as to perform a pendulum motion. The weights 3 are arranged so as to perform single-string vibration in the swinging direction of the structure 1 via the supporting rollers 4 provided on the base 2, and a spring system is constituted by a restoring force utilizing gravity, and The vibration region of the weight 3 is regulated within a range in which the protrusions 5 provided at both ends of the weight 3 come into contact with the left and right buffers 7 on the bearing mount 6 installed at positions where the weight 3 is sandwiched in the front and rear. In addition, a rack 8 is provided on the upper surface of the weight 3 along the vibration direction, and a shaft 9 is arranged above the rack 8 so as to be orthogonal to the rack 8 so that the shaft 9 can be moved forward and backward. A bearing base 6 is rotatably supported via a bearing 10, and an intermediate portion of the shaft 9 is provided. The pinion 11 is attached so as to mesh with the rack 8 so that the vibration energy of the weight 3 can be transmitted to the shaft 9 as rotational energy via the rack 8 and the pinion 11, and one end of the shaft 9 , A lever 14 which is connected to a speed reducer 13 installed on another mount 12 and which is extended to the left and right at the output shaft portion of the speed reducer 13, and the left and right ends of the lever 14 and the base 2 An oil damper 15 is provided between the oil damper 15 and the oil damper 15, and the rotational energy of the shaft 9 input to the speed reducer 13 can be attenuated by the oil damper 15 via the speed reducer 13. In addition,
Reference numeral 16 is a flywheel for applying an inertial force to the rotation of the shaft 9.

In the state where the vibration damping device is installed on the top of the structure 1, when the structure 1 shakes due to aerodynamic force or the like, the shaking energy is transmitted to the weight 3,
The weight 3 starts a single string vibration with a delay of 90 ° with respect to the swing of the structure 1. At this time, the rack 8 provided on the upper surface of the weight 3 and the pinion 11 on the shaft 9 arranged above the weight 3
The vibration energy of the weight 3 is applied to the shaft 9 as rotational energy via the rack 8 and the pinion 11 because of the meshing with and. When rotational energy is applied to the shaft 9, the speed reducer 13 is connected to one end of the shaft 9, so the rotation of the shaft 9 is decelerated by the speed reducer 13. Further, at this time, Since the output shaft of the speed reducer 13 is provided with the oil damper 15, the oil damper 1
5 is oscillated through the speed reducer 13, and the rotational energy of the shaft 9 is attenuated. As a result, the sway of the structure 1 is suppressed. That is, energy such as aerodynamic force that enters the structure 1 is converted into kinetic energy of the weight 3, and this is consumed by the oil damper 15 via the rack 8, the pinion 11, the shaft 9, and the speed reducer 13. The sway of the structure 1 can be quickly suppressed by the indirect energy consumption form. Further, according to the above vibration damping device, even if the natural periods of the weight 3 and the structure 1 are likely to deviate from each other, they can be synchronized by the inertial action of the flywheel 16 on the shaft 9. is there.

[0004]

However, in the case of the recently proposed vibration damping device, since the rotation energy of the shaft 9 is attenuated by the swinging operation of the oil damper 15, the damping rate is constant. It is considered that it may be difficult to give optimum damping, and since the flywheel 16 for adjusting the natural period of the weight 3 is provided on the shaft 9, a large flywheel 16 is required, It is considered to be one of the factors that hinder the compactness of the entire device.

Therefore, the present invention seeks to provide optimum damping and to make it compact as a whole.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a structure in which a damping body capable of performing single-string vibration is swingably arranged on the upper part of a structure, and An eddy current brake is provided on the upper surface of the body, which has a rack extending in the swinging direction, and at the end of a shaft having a pinion that meshes with the rack, an eddy-current brake whose brake force can be adjusted by changing the exciting current. The pinion is connected in a direction perpendicular to the shaft of the pinion through a box, and a flywheel is provided on the high speed side shaft portion of the speed increasing gear box.

[0007]

[0008]

[Function] Optimum damping can be given by selecting the exciting current of the eddy current brake. Also, by providing the flywheel on the high speed side shaft part of the speed increasing gearbox, the flywheel can be made smaller, and moreover, the swirl brake has a speed increasing gearbox at the end of the shaft having the pinion. Since they are connected and arranged in a direction perpendicular to the axis of the pinion, it is advantageous in terms of plane space and the overall size can be made compact.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention, which is similar to the vibration damping device shown in FIGS.
A weight 3 serving as a vibration damper capable of performing single-string vibration is swingably arranged on the upper part of the rack, and a rack 8 extending in the vibration direction is provided on the upper surface of the weight 3 and A shaft 9 is arranged in the upper part so as to be orthogonal to the rack 8 and
In the middle part of the pinion 1 so as to mesh with the rack 8.
1 is mounted, and both ends of the shaft 9 are rotatably supported by the bearings 10 on the bearing mounts 6, and the speed increasing gearbox 21 is mounted on the mounts 12 provided outside the bearing mounts 6. Are installed respectively, and each gear box 21
In addition, the eddy-current brake 17 is connected to each end of the shaft 9 and to the high-speed side shaft 21a of each gear box 21 so that the braking force can be adjusted by changing the exciting current. They are connected to each other via a speed increasing gear box 21 so as to be arranged in a direction perpendicular to the shaft 9, and further, an output gear 18 is provided on a high speed side shaft portion 21a of the one gear box 21. A shaft 20 having a transmission gear 19 at one end that meshes with is rotatably supported on the one gear box 21 and
A small flywheel 24 is attached to the other end of the. The eddy-current brake 17 generates a brake torque based on the same principle as an induction motor according to Fleming's left-hand rule, and the larger the exciting current and the lower the output side rotational speed, the greater the braking force. is there. In addition, 22 is a guide rail for guiding the swing of the weight 3, and 2
Reference numeral 3 indicates a guide roller. Also, in FIG. 1 and FIG.
The same parts as those in FIGS. 3 to 5 are designated by the same reference numerals.

Also in the case of the vibration damping device of the present invention having the above-mentioned structure, when the weight 3 makes a single string vibration due to the swaying of the structure 1, the weight 3 of the weight 3 is moved in the same manner as that shown in FIGS. The vibration energy is applied as rotation energy to the shaft 9 via the rack 8 and the pinion 11. Further, the rotational energy of the shaft 9 enters the vortex brake 17 via the gear box 21 and is damped there. At this time, since the eddy-current brake 17 can adjust its braking force by changing the exciting current, the rotational energy of the shaft 9 can be optimally damped by selecting the braking force. Also, in the above, the weight 3 and the structure 1
A flywheel 24 is provided to adjust so that the natural period of the flywheel does not shift.
Reference numeral 4 is attached to a shaft 20 adapted to take out a rotational force from a high speed side shaft portion 21a of a gear box 21 via an output gear 18 and a transmission gear 19, and the rotation of the shaft 9 is accelerated to a flywheel 24. Since it is transmitted, a small flywheel 24 can be used. Furthermore,
Since the eddy-current brake 17 is connected to the end of the shaft 9 having the pinion 11 through the speed-increasing gear box 21 in a direction perpendicular to the shaft 9, the eddy-current brake 17 should be extended over the extension line of the shaft 9. This is advantageous in terms of plane space because there is no
Therefore, the entire device can be made compact.

The present invention is not limited to the above-described embodiment. For example, the flywheel 24 may be directly attached to the high speed side shaft portion 21a of the gear box 21, and other points of the present invention. Needless to say, various changes can be made without departing from the range.

[0013]

As described above, according to the vibration damping device of the present invention, the vibration energy of the vibration damping body capable of performing the single string vibration is transmitted to the shaft through the rack and the pinion and further increased from the shaft. Since it is configured to be transmitted to the vortex brake via the speed gear box, the sway energy of the structure can be easily converted to the kinetic energy of the vibration suppressor, and the vortex brake provides damping for optimum damping. In addition, a flywheel for adjusting the natural period of the damping body and the structure is provided on the high-speed side shaft part of the speed-up gearbox, so the flywheel can be sped up and the flywheel can be made smaller. In addition, the eddy-current brake has the pinion because it is connected to the end of the shaft having the pinion in the direction perpendicular to the shaft via the speed increasing gearbox. Without it protruding significantly on the extension of the axis a plan spaces advantageous to obtain achieving compactness of the entire apparatus, exhibits excellent effects and the like.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a vibration damping device of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a front view showing an example of a recently proposed vibration damping device.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a side view of FIG. 3;

[Explanation of symbols]

 1 Structure 3 Weight (vibration control body) 8 Rack 9 Shaft 11 Pinion 17 Eddy current brake 21 Speed increasing gear box 21a High speed side shaft 24 Flywheel

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Yata 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawajima-Harima Heavy Industries Co., Ltd. Technical Research Institute (72) Yuji Koike Shinnaka, Isogo-ku, Yokohama-shi, Kanagawa Haramachi No. 1 Ishikawajima Harima Heavy Industries Co., Ltd. Technical Research Institute (56) References JP-A-2-154824 (JP, A) JP-A-2-102945 (JP, A) JP-A-62-251542 (JP, A)

Claims (1)

(57) [Scope of utility model registration request] 1. A vibration damping body capable of performing single-string vibration is swingably disposed on an upper portion of a structure, and a rack extending in a swinging direction is provided on an upper surface of the vibration damping body, and the rack is provided. At the end of the shaft that has a pinion that meshes with a pinion, an eddy current brake whose braking force can be adjusted by changing the exciting current is connected to the pinion shaft at a right angle through a speed increasing gearbox. Further, a vibration damping device having a configuration in which a flywheel is provided on a shaft portion on a high speed side of the speed increasing gear box.