JPH07317372A - Damping device - Google Patents

Abstract

PURPOSE:To facilitate any adjustment of natural frequency by screwing a damping device made up of attaching a weight tight to both ends of a plate spring in a column via a shiftable spring washer, and simultaneously attaching weight tight to a fixed plate via a damper. CONSTITUTION:A damping device U made of attaching a weight 11 tight to a column 4 erected on a fixed plate 2 via a plate spring 6 is attached to a frame 1 by a bolt 3 in altering its arrangement in space between two underfloor beams 16 and 16. In addition, this plate spring 6 is attached to the column 4 through a clamped upper plate 5 and a freely fitted lower plate 7 via a shiftable spring washer 8, while the weight 11 and the fixed plate 2 both are attached via a damper 13 consisting of a viscoelastic body. Then the weight 11 is rocked as centering on a support point by means of the spring washer 8 and absorbs the vibration, while the support point of the weight 11 is separately shifted to some extent, thereby performing the adjustment of natural frequency. With this constitution, an optimum vibro-damping characteristic is 70 by simple structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for damping the vibration of a vibrated body such as a structure.

[0002]

2. Description of the Related Art Conventionally, as a vibration damping device, for example, a working fluid such as oil or air is used, and a piston is provided in a case. The piston forms two fluid chambers in the case, and the piston is provided with the two It is known that an orifice that communicates with a fluid chamber is provided, an operating shaft fixed to a piston extends inside and outside a case, and a vibrating body is connected to the operating shaft.

[0003]

However, in the above conventional vibration damping device, the structure becomes complicated, and
The vibration damping characteristics are fixed depending on the shape of the orifice and the characteristics of the working fluid. Therefore, when the vibration damping device is used in a vibration system different from the originally designed conditions, there is a problem that an optimum vibration damping characteristic cannot be obtained.

The present invention solves the above problems, and an object of the present invention is to provide a vibration damping device capable of easily obtaining an optimum vibration damping characteristic for a structure with a simple structure. To do.

[0005]

To this end, a vibration damping device of the present invention is fixed to a fixed plate 2 fixed on a pedestal 1, a column 4 provided on the fixed plate 2, and a tip of the column 4. An upper support plate 5, a leaf spring 6 and a lower support plate 7 loosely fitted to the column 4, a weight 11 fixed to both sides of the leaf spring 6, a weight 11 and a fixing plate 2
And a spring washer 8 arranged between the upper support plate 5 and the lower support plate 7 for supporting the leaf spring 6, and the spring washer 8 is movable. It is characterized by having done. It should be noted that the numbers added to the above-mentioned configurations are for comparison with the drawings in order to facilitate understanding of the present invention, and the configurations of the present invention are not limited thereby.

[0006]

In the present invention, the support points of the left and right weights can be independently moved to adjust the natural frequency of the weight.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the vibration damping device of the present invention.
1A is a plan view, FIG. 1B is a sectional view taken along the line BB of FIG. 1A in the direction of the arrow, and FIG. 1C is FIG. 1B.
It is sectional drawing seen in the arrow direction along the CC line of FIG.

A fixing plate 2 is fixed by bolts 3 on a floor or a pedestal 1 under the floor. Fixed plate 2
A column 4 is provided on the upper side, and an upper support plate 5 is fixed to the tip of the column 4. A leaf spring 6 and a lower support plate 7 are provided in advance in the through hole 6 in the support column 4, respectively.
a through 7a. These through holes 6
The inner diameters of a and 7 a are formed to be larger than the outer diameter of the column 4. Further, elongated holes 5a and 7b are formed at four corners of the upper support plate 5 and the lower support plate 7.

Then, bolts 9 are inserted into the long holes 5a and 7b of the upper support plate 5 and the lower support plate 7 through spring washers 8 and fixed by nuts 10, and the leaf springs 6 are supported by the spring washers 8. I have to. Weights 11 are attached to both sides of the leaf spring 6. L-shaped brackets 12 are fixed to the four corners of the fixing plate 2, and the weight 11 and the bracket 1 are fixed.
A damper member 13 made of a viscoelastic body is fixed between the two.

FIG. 2 shows an example in which the vibration damping device U described in FIG. 1 is arranged between the beam 16 under the floor of the building 15, A, D.
Four damping devices U are arranged in the zone, and five damping devices U are arranged in the B and C zones.

The operation of the present invention having the above structure will be described. When the gantry 1 vibrates due to an earthquake or the like, the left and right weights 11 fixed to the leaf springs 6 swing around a support point of the spring washer 8 and absorb the vibration. At this time, by moving the bolt 9 in the elongated holes 5a and 7b, the support points of the left and right weights 11 can be independently moved, and the natural frequency of the weight 11 can be adjusted. Therefore,
It is possible to easily obtain optimum vibration damping characteristics for the structure.

[0012]

As is apparent from the above description, according to the present invention, it is possible to easily obtain the optimum vibration damping characteristic for a structure with a simple structure.

[Brief description of drawings]

1 shows an embodiment of a vibration damping device of the present invention, and FIG.
1A is a plan view, FIG. 1B is a sectional view taken along the line BB of FIG. 1A in the direction of the arrow, and FIG. 1C is FIG. 1B.
It is sectional drawing seen in the arrow direction along the CC line of FIG.

FIG. 2 is a plan view showing an arrangement example of the vibration damping device of the present invention.

[Explanation of symbols]

1 ... Frame, 2 ... Fixing plate, 3 ... Bolt, 4 ... Strut,
5 ... Upper support plate 6 ... Leaf spring, 7 ... Lower support plate, 6a, 7a ... Through hole, 5a, 7b ... Long hole 8 ... Spring washer, 9 ... Bolt, 10 ... Nut, 11 ... Weight 12 ... Bracket, 13 ... Damper member, U ... Damping device

 ─────────────────────────────────────────────────── ─── Continued front page (72) Shoji Nakamura 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Yoshinori Tsuchida 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd.

Claims (1)

[Claims] 1. A fixed plate fixed on a pedestal, a pillar provided on the fixed plate, an upper support plate fixed to a tip of the pillar, a leaf spring loosely fitted to the pillar 4, and A lower support plate, a weight fixed to both sides of the leaf spring, a damper member fixed between the weight and the fixed plate, and the plate disposed between the upper support plate and the lower support plate A vibration damping device, comprising: a spring washer for supporting a spring, the spring washer being movable.