JPH07293636A - Rolling pendulum-type damping device - Google Patents

Abstract

PURPOSE:To compactly constitute a damping device, and also to make a structure wherein a vibrational period can not be easily changed by connecting a rolling body pivotally supported by a pivot pin on the suitable number of mutually adjacent weights out of a plurality of weights. CONSTITUTION:A rolling body 7 pivotally supported on a pivot pin 5 and the mutually adjacent weights 12 pivotally supported on the pivot pin 5 are combined with each other, and the damping number can be easily adjusted by increasing or decreasing the weights 12. As a result, an arm of a pendulum is not eliminated in comparison with a conventional one, and the whole structure can be made compact since a spring is not eliminated in comparison with a conventional one, and the damping number can be easily adjusted by changing the weights. Moreover, a driving device 11 is provided, and damping force is applied to a truck 1 by the driving device, and active damping can be performed, thereby, damping effect is improved and also the structure is made extremely compact. Particularly, when the driving device 11 is fixed on an outer frame 2, the driving device 11 is not moved tocher with the truck 1, and wiring for the driving device is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling pendulum type vibration damping device.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional pendulum type vibration damping device. In this, an arm a having a weight b at its lower end is pivotally supported by a frame d provided on a vibration damping object e. A spring c is attached between the middle part of the arm a and the frame d. This device can change the vibration cycle by changing the mounting position of the spring c. However, when the cycle is made long, the length of the arm a becomes long. Also, FIG. 5 shows a known spring-mass type vibration damping device. A spring f is provided between the damping object e and the weight g so that the weight g vibrates left and right on the roller h by the vibration of the damping object e.
As shown in FIG. 4, since there is no arm, the structure can be made compact accordingly, but in order to change the vibration cycle, the spring f must be replaced each time, and it is not easy to change the vibration cycle.

[0003]

Provided is a vibration damping device having a compact vibration damping device and having a structure in which a vibration cycle is easily changed.

[0004]

[Means for Solving the Problems] A bogie that is horizontally movably supported on an upper horizontal supporting surface of an outer frame installed on an object to be damped, and a bogie that is horizontally mounted on the bogie in a direction orthogonal to the moving direction of the bogie A supported pivot pin, a rolling element pivotably supported at an intermediate position of the pivot pin and having an arc gear on its lower end surface, and pivotally supported by the pivot pin on both sides of the rolling element. A plurality of weights that can be attached to and detached from the rolling element by a stopper, an upper rack that meshes with an arc gear on the lower end surface of the rolling element, and a lower rack that meshes with a pinion driven by a drive device on the bogie bottom plate. The rack supporting rod was provided, and the frequency was made variable by increasing or decreasing the total mass of the rolling elements and the weights connected to the rolling elements.

Further, a bogie that is horizontally movable on an upper horizontal supporting surface of an outer frame installed on the object to be damped, and a pivot that is horizontally supported on the bogie in a direction orthogonal to the moving direction of the bogie. A pin, a rolling element pivotally supported at an intermediate position of the pivot pin and having an arc gear on its lower end surface, and the rolling element pivotally supported by the pivot pin on both sides of the rolling element. A plurality of weights that can be attached and detached by stoppers, a rack support rod that includes an upper rack that meshes with the circular arc gear on the lower end surface of the rolling element, and a pinion that is driven by a drive device fixed to the outer frame. It was equipped with a lower rack below the bottom plate of the bogie to fit, and the frequency was made variable by increasing or decreasing the total mass of the rolling elements and the weights connected thereto.

[0006]

By connecting an appropriate number of the rolling elements 7 pivotally supported by the pivot pin 5 and a plurality of weights 12 adjacent thereto, the total mass of the rolling portions can be changed to adjust the frequency. As a result, the arm of the conventional pendulum type pendulum is eliminated, the overall configuration can be made compact, and the weight 12 for the rolling element 7 is provided.
By increasing or decreasing, the frequency can be adjusted easily and in a wide range. Further, the rolling element 7 is forcibly rolled by the drive device 11 provided in the bogie 1 or in the outer frame to enable active vibration damping at a predetermined frequency.

[0007]

EXAMPLE An explanation will be given with reference to FIG. FIG. 1 shows a rolling pendulum type vibration damping device. A carriage 1 is supported on an upper horizontal support surface 3 of a box-shaped outer frame 2 via a lower laway 4. The dolly 1 has a U-shaped cross section, and a pivot pin 5 is supported (fixed) by a pair of support brackets 6 on the upper part.
An inverted fan-shaped rolling element 7 is swingably supported at the center of the pivot pin 5. An arc gear 8 having a radius r (FIG. 2) centered on the pivot pin 5 is integrally attached to the lower portion of the rolling element 7. A rack support rod 9 is disposed integrally with the outer frame 2 between the arc gear 8 and the bottom plate 1a of the carriage 1. An upper rack 9a is provided on the upper surface of the rack support rod 9 and meshes with an arc gear 8 provided on the lower portion of the rolling element 7. Reference numeral 9b denotes a lower rack provided on the lower surface of the rack support rod 9 and meshes with a pinion 10 driven by a drive device 11 installed on the bottom plate 1a of the carriage 1.

Numeral 12 is on both sides of the rolling element 7, and is a weight that is pivotally supported by the pivot pin 5, and has the same shape as the rolling element 7, that is, an inverted fan shape. A plurality of weights 12 are pivotally supported on both sides of the rolling element 7, and a stopper 13 as shown in FIG.
By connecting the lower parts of the weights 12 adjacent to each other by means of the screw 14 and the united parts, and combining them with the rolling elements 7, the total mass of the rolling parts can be increased or decreased. Weights 12 on both sides of the rolling element 7
The number of is the same on the left and right for good balance. Reference numeral 15 denotes a circular convex portion provided on the side surface of the weight 12, which is adjacent to the weight 12.
A circular concave portion 16 is provided in the concave portion 16 so that the convex portion 15 and the concave portion 16 are brought into close contact with each other when they are connected by the stopper 13.

The operation of the drive device 11, the pinion 10 and the lower rack 9b will be described below with reference to FIG. Rolling element 7 pivotally supported by pivot pin 5
And the weights 12 connected to this form a rolling portion. When the vibration-damping target swings due to an earthquake or the like, the carriage 1 moves in parallel on the outer frame 2 via the lower laue 4 correspondingly. At that time, the rolling element 7 pivotally supported by the pivot pin 5
, And the weights 12 ... Try to move in parallel, but the rolling portion rolls due to the meshing of the circular gear 8 provided at the lower end of the rolling element 7 and the upper rack 9a on the rack supporting rod 9. Now, assuming that the carriage 1 has moved in parallel by a distance x as shown in FIG. 2,
The rolling portion rolls by θx / r (r is the radius of the arc gear 8) with respect to this movement amount x. In this state, the rolling portion receives a restoring force due to gravity, so that a force for returning the carriage 1 to the original state acts.

The frequency f _{1 at} this time is as follows: a) When all the weights 12 are attached to the rolling element 7 side (the mass of the carriage is ignored).

[Equation 1] However, g: Gravity acceleration s: Distance from pivot pin 5 to center of gravity of rolling weight i: Radius of rotation around center of gravity r: Radius of arc gear

B) Next, when the weight 12 is completely separated from the rolling element 7 (ignoring the mass of the central rolling element 7).
f ₁ = 0.

C) When divided so that rolling element + weight = rolling part = mr trolley + weight = mt,

[Equation 2] ... will be. Therefore, the frequency can be changed from 0 to f ₁ by changing the division ratio of the weight 12.

The above is the case where the rack supporting rod 9 is fixed and the lower rack 9b is free. However, the present invention further includes the pinion 10 that meshes with the lower rack 9b on the lower surface of the rack supporting rod 9.
Was forcedly driven by the driving device 11. This is because when the vibration of the vibration suppression target is small, the parallel movement (vibration) of the carriage 1 is correspondingly small and the vibration damping force is also small. This is to increase the parallel movement of to obtain a greater damping force. Further, since the drive device 11 can be regarded as a weight by providing the drive device 11 on the bottom plate 1a of the trolley 1, the weight 12 and the trolley 1 can be reduced by that amount, and the overall size can be made compact. it can.

[0014]

[Second Embodiment] A second embodiment will be described with reference to FIG. As is clear from FIG. 3, in this embodiment, the carriage 1, the rolling elements 7,
The supporting structures of the weight 12 and the carriage 1 are exactly the same. However, in this embodiment, only the upper rack 9a that meshes with the arc gear 8 is attached to the rack support rod 9. And the lower rack 9b is attached to the lower surface of the bottom plate 1a of the trolley 1,
It meshes with a pinion 10 driven by a drive device 11 fixed to the outer frame 2.

The operation is similar to that of the first embodiment, but since the drive device 11 is not mounted on the carriage 1 (the drive device 11 does not move), wiring for the drive device 11 is easy.

[0016]

[Effect] The rolling element 7 pivotally supported by the pivot pin 5 and the adjacent weight 12 pivotally supported by the pivot pin are combined to form the weight 12
The frequency can be easily adjusted by increasing or decreasing. As a result, the pendulum arm is eliminated as compared with the known one shown in FIG. 4, and the spring is eliminated as compared with the known one shown in FIG. You can now adjust the frequency.

Further, since a drive device is provided so that a vibration damping force can be applied to the carriage to perform active vibration damping, the vibration damping effect is improved and the structure is made extremely compact.

In particular, in the second embodiment, since the drive device is fixed to the outer frame, the drive device does not move together with the carriage as compared with the first embodiment, and the wiring for the drive device is easier.

[Brief description of drawings]

1A and 1B are perspective views of a vibration damping device of the present invention, in which FIG. 1A is a partially cutaway overall perspective view, and FIG.

FIG. 2 is an operation explanatory view of the vibration damping device of FIG.

FIG. 3 is a perspective view showing a second embodiment of the present invention.

FIG. 4 is a known pendulum type vibration damping device.

FIG. 5 shows a known spring-mass type vibration damping device.

[Explanation of symbols] 1 bogie 2 outer frame 3 horizontal support surface 4 lower laway 5 pivot pin 6 support bracket 7 rolling element 8 arc gear 9 rack support rod 9a, 9b rack 10 pinion 11 drive unit 12 weight 13 stop 14 screw 15 circular convex 16 circular concave

Claims (2)

[Claims] 1. A bogie supported horizontally on an upper horizontal support surface of an outer frame installed on a vibration-damping object, and a pivot horizontally supported on the bogie in a direction orthogonal to the moving direction of the bogie. A support pin, a rolling element pivotably supported at an intermediate position of the pivot support pin and having an arc gear on its lower end surface, and the rolling element pivotally supported by the pivot support pin on both sides of the rolling support. A rack support including a plurality of weights that can be attached and detached by anti-locking devices, an upper rack that meshes with the circular arc gear on the lower end surface of the rolling element, and a lower rack that meshes with a pinion driven by a drive device on the bottom plate of the bogie. A rolling pendulum type vibration damping device comprising a rod and having a variable frequency by increasing or decreasing the total mass of a rolling element and a weight connected to the rolling element. 2. A dolly supported horizontally on an upper horizontal support surface of an outer frame installed on a vibration-damped object, and a pivot horizontally supported on the dolly in a direction orthogonal to the moving direction of the dolly. A support pin, a rolling element pivotably supported at an intermediate position of the pivot support pin and having an arc gear on its lower end surface, and the rolling element pivotally supported by the pivot support pin on both sides of the rolling support. A plurality of weights that can be attached and detached by an anti-locking device, a rack support rod including an upper rack that meshes with an arc gear on the lower end surface of the rolling element, and a pinion driven by a drive device fixed to the outer frame. A rolling pendulum type vibration damping device having a lower rack below a bottom plate of a bogie that meshes with the rolling body and a weight that is connected to the rolling body to increase or decrease the total mass.