JPS62194049A - Vibration absorbing device - Google Patents

Abstract

PURPOSE:To absorb vibration in all the directions, by providing a vibration absorbing unit main body with a vertical direction vibration absorbing unit and a horizontal direction vibration absorbing unit, in the vertical direction. CONSTITUTION:A vibration absorbing unit main body 1 is provided with a plurality of vertical direction vibration absorbing units 2 and a plurality of horizontal direction vibration absorbing unit 5, in the vertical direction. The vertical direction vibration absorbing unit 2 is such that a weight 4 is movably disposed on a leaf spring 3 horizontally attached to the cylindrical main body 1. The horizontal direction vibration absorbing unit 5 is such that a weight 7 is movably disposed on a leaf spring 6 vertically attached to the main body 1. Since the phases of the upper and lower units 2, 5 are shifted 60 deg., the vibrations in all the directions including tortional vibration can be absorbed by a compact device.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a spring pendulum type dynamic vibration absorber.

[Conventional technology]

A spring mass system having the same Na frequency as the vibrating structure is attached to the vibrating structure to absorb the vibration of the structure. For example, to absorb vibrations in the horizontal direction, as shown in Figure 4, a spring pendulum type dynamic vibration absorber is used, in which a pendulum with a weight of 1 mm in diameter is attached with a spring with an effective spring constant, and its natural frequency is Vibration is absorbed by making ω-11= equal to the natural frequency of the structure.

[Problem that the invention seeks to solve]

However, the device shown in Fig. 4 only absorbs vibrations in one horizontal direction, so in order to absorb vibrations such as whirling, a dynamic vibration reducer is additionally provided to absorb vibrations in a direction perpendicular to this. Therefore, there is a problem in that a large installation space is required. Additionally, in order to absorb vertical vibrations in addition to deflection vibrations, it is necessary to install a dynamic vibration absorber that absorbs vertical vibrations as shown in Figure 5, which requires a larger installation space. become.

An object of the present invention is to provide a dynamic vibration reducer that is small and capable of absorbing vibrations in all directions (six degrees of freedom).

[Means and actions for solving the problem] The main body of the dynamic vibration reducer includes a plurality of vertical vibration absorption units that absorb vertical vibrations and a plurality of horizontal vibration absorption units that absorb horizontal vibrations. arranged vertically. With this configuration, vibrations in all directions (6 degrees of freedom) can be absorbed with a compact structure.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. a plurality of vertical vibration absorption units 2 that absorb vertical vibration;
A plurality of horizontal vibration absorbing units 5 for absorbing horizontal vibrations are disposed in the dynamic vibration absorber main body 1 in a downward direction. The vertical vibration absorbing unit 2 is constructed by movably providing a weight 4 on a temporary spring 3 provided horizontally on a cylindrical main body 1. The horizontal vibration absorbing unit 5 is constructed by movably providing a weight 7 on a plate spring 6 provided vertically to the main body l. In this example, three vibration absorbing units 2 are arranged equally in the circumferential direction on the lower side of the main body 1, and three vibration absorbing units 5 are arranged on the 1st side of the main body 1.
They are arranged 60 degrees apart from each other.

Due to the L structure, all directions including torsional vibration (61-th 1
1 degree) vibration can be absorbed. By arranging the upper and lower units 5.2 with their phases shifted by 60°, a compact structure can be achieved in which the weights 7 and 4 do not collide with each other.

Note that leaf spring 3. For G, it is also possible to increase damping by using a so-called distributed steel plate in which a viscoelastic substance is sandwiched between thin steel plates.

〔Effect of the invention〕

The dynamic vibration absorber of the present invention is as described above, has a compact structure, and can absorb vibrations in all directions (6 degrees of freedom). Therefore, it is possible to easily install the dynamic vibration absorber even in locations where sufficient space for installing the dynamic vibration absorber cannot be secured, such as beams, columns, walls, and floors of various structures, when vibration occurs.

[Brief explanation of drawings]

1 to 3 are a plan view, a side view, and a perspective view showing one embodiment of the present invention, and FIGS. 4 and 5 are explanatory diagrams of a conventional one-way dynamic vibration absorber, respectively. l...Main body, 2...Vertical vibration absorption unit,
5... Horizontal vibration absorption unit. Figure 1 Figure 2 Figure 4 Figure 3 Figure s5

Claims (1)

[Claims] A dynamic vibration absorber in which a plurality of vertical vibration absorption units that absorb vertical vibrations and a plurality of horizontal vibration absorption units that absorb horizontal vibrations are arranged vertically in a dynamic vibration absorber main body. .