JP2003106372A - Rolling body type vibration isolation system with dropping-out preventive mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a vibration isolation system comprised of a rolling body. SOLUTION: A mechanism is necessitated in which respective rolling bodies are stably rolled without generating slippage and dropping-out. Recessed and projected meshed mechanisms surely functioning in respective states during a neutral condition and the maximum rolling condition are arranged. In an intermediate condition, shapes of two types of the meshed portions are set so that their objective is achieved by making either mechanism worked within a mere sliding range while expecting friction of a contact surface and also under bad conditions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is an implementation example of a rolling element type isolator that constitutes a basic insulation type seismic isolation structure.

[0002]

2. Description of the Related Art Aside from the example of using a sphere whose diameter is not so large, there are few examples of realization of seismic isolation isolators using rolling elements. Reinforcing bars are used for stability purposes in preparation for similar skidding.

[0003]

On the other hand, this isolator, which is manufactured by lathe processing of steel material, has some features such as simple manufacture, but the rolling element slides greatly at the contact portion between the upper and lower receiving plates. In order to work in a stable and stable manner, some kind of ingenuity is required for the mutual shapes.

[0004]

[Means for Solving the Problems] The receiving plate and the rolling element move their contact positions in accordance with the rolling motion of the rolling element and are accompanied by a relative change in angle. In order to prevent slipping in both neutral and maximum rolling conditions, it is possible to provide an uneven meshing mechanism at the center of the rolling surface and on the receiving plate side and rolling element side of the outermost peripheral part of the rolling surface. To be With respect to such a mechanism, the rolling elements made of a rotating body having a vertical line as an axis and the receiving plate thereof are shown in cross section as shown in FIGS. 1 and 2. Figure 1 is neutral, Figure 2 is the maximum rolling state,
In this example, the shapes of the engaging protrusions are a symmetrical trapezoid and an asymmetric trapezoid. Similarly, the recess is also a simple polygonal shape such as a trapezoid.

For these intermediate rolling conditions, the polygon of the above-mentioned polygon is designed so that one of the meshing mechanisms works while expecting friction of the contact surface and within a range of slight sliding even under adverse conditions. Choose the shape and size.

[0006]

EXAMPLE A rolling element is a rotating element, and at the same time, it is symmetrical vertically. The rolling surface can be formed by lathing a thick plate.
As the rolling elements, two thick plates thus processed are attached back to back, for example, to a steel pipe with a flange to complete the rolling. Similarly, the backing plate can be formed by lathing a thick plate, but in order to ensure the dynamic friction of the contact surface for intermediate rolling conditions, a large number of concentric shallow scratches are formed on either side of the backing plate or rolling element. It is possible to attach it.

When the height of the rolling element is sufficiently large, the maximum rolling angle is small, and even in the maximum rolling state, the central meshing mechanism can prevent the rolling element from falling off.

[0008]

As described above, the restoring force of the isolator, which can be realized while ensuring the stability of the rolling elements, is proportional to the weight of the isolator. For example, if a shape of a linear restoring force is set on the generatrix of a rolling element that is a rotating body, the natural frequency of the structure becomes independent of the supporting weight. In other words, unlike laminated rubber, which is an example of an isolator, this isolator ranges from heavy structures to lightweight
The applicable range is extremely wide.

Further, if the above-mentioned bus bar is set to have a shape that makes surface contact with the receiving plate when the rolling element is in the neutral state, a restoring force characteristic with a sharp rise is provided, and stability against wind load can be remarkably increased.

[Brief description of drawings]

FIG. 1 is an operating state of a meshing mechanism showing stability in a neutral state, which is shown in cross section.

[Fig. 2] Operation state of the meshing mechanism, which is shown in cross section and is conscious of stability during maximum rolling.

[Explanation of symbols]

1 ... rolling element 2 upper support plate 3 ... Lower support plate

Claims (2)

[Claims] Claim: What is claimed is: 1. A rolling element-type seismic isolation isolator having a concave and convex meshing mechanism at the center of the receiving plate and the center of the rolling element-side rolling surface that contacts the receiving plate to prevent the rolling element from falling off. 2. The seismic isolation isolator according to claim 1, wherein a concavo-convex meshing mechanism formed in an annular shape is provided at the outermost peripheral portion of the rolling surface of the rolling element and the corresponding portion of the receiving plate.