JPS6119220Y2 - - Google Patents

Description

[Detailed explanation of the idea] This proposal concerns improvement of a vibration isolator.

Various types of dampers have been used for the purpose of vibration isolation of machines and structures. Among them, fluid dampers, especially oil dampers, are widely used because they are theoretically easy to handle and have high reliability.However, in conventional fluid dampers, as shown in Fig. 1A and B, fluid a flows through a small gap. The basic principle is energy dissipation when flowing through orifice b, and since the damper's operating direction is limited to one direction, the second
As shown in the figure, this method cannot be applied to a machine or structure c in which vibration is three-dimensional (translational motion in the x, y, and z directions and rotational motion around the x, y, and z axes) and tends to generate large amplitude vibrations. Furthermore, since the structure required sophistication, there was a problem in that it was expensive.

This proposal addresses the above-mentioned problems, and includes an inner cylinder fixed to a vibration-isolated member such as a structure, and an outer cylinder fixed to a stationary member such as a frame. and refers to a vibration isolating device that is assembled with a certain void in all directions, and the void is filled with a vibration isolating fluid such as high viscosity silicone oil. The part that does this can absorb kinetic energy in three-dimensional directions. Production costs can be reduced. Another object of the present invention is to provide an improved vibration isolating device that can maintain a large vibration damping ability for a long period of time even though the device itself is small.

As described above, the vibration isolator of the present invention includes an inner cylinder fixed to a vibration-isolated member such as a structure, and an outer cylinder fixed to a stationary member such as a frame, and the inner cylinder and the outer cylinder are different from each other. They are assembled with a certain amount of space in all directions, and vibration isolating fluid such as high viscosity silicone oil is filled in this space, so that the vibration of the inner cylinder when the vibration-isolated member vibrates is reduced. , is suppressed by vibration isolating fluid such as high viscosity silicone oil. Moreover, this vibration suppressing effect is achieved when the movement of the inner cylinder is a translational movement in the x, y, z directions or an x, y, z
Even rotational motion around an axis or large-amplitude motion can be achieved without causing the inner cylinder to collide with the outer cylinder, and kinetic energy in three-dimensional directions can be absorbed. Further, the vibration isolator of the present invention is constructed as described above, and the structure is simple and does not require sophistication, so that manufacturing costs can be reduced. Further, the vibration damping fluid is silicone oil or the like, which has high viscosity and durability due to small temperature changes, and can maintain a large vibration damping ability for a long period of time even if the device itself is small.

Next, the vibration isolator of the present invention will be explained with reference to an embodiment shown in FIGS. 3 and 4. 1 is a member to be vibration-isolated such as a structure, 2 is an inner cylinder fixed to the member to be vibration-isolated 1, and 3 is A stationary member 4 such as a frame is an outer cylinder fixed to the stationary member 3, and the inner cylinder 2 and the outer cylinder 4 are assembled with a certain gap in all directions. Further, 5 is a vibration-proofing fluid such as high viscosity silicone oil sealed in the space, and 6 is a flexible support member such as a spring or rubber.

Since the vibration isolating device of the present invention is configured as described above, the vibration of the inner cylinder 2 when the vibration isolating member 1 vibrates is suppressed by the vibration isolating fluid 5 such as high viscosity silicone oil. Moreover, this vibration suppressing effect is achieved when the movement of the inner cylinder 2 is a translational movement in the x, y, z directions or a x, y,
Even rotational motion around the z-axis or large-amplitude motion can be achieved without causing the inner tube 2 to collide with the outer tube 4, and three-dimensional motion can be absorbed.

FIG. 5 shows the vibration isolation characteristics of a conventional damper whose operating direction is unidirectional, and FIG. 6 shows the vibration isolation characteristics of the vibration isolator of the present invention. As is clear from these figures, conventional dampers can only suppress translational motion in the z-direction, but the vibration isolator of the present invention can suppress motion in all directions.

FIG. 7 also shows a pair of vibration isolators 2,
4 and 5 and a pair of flexible support members 6 are shown. In this specific example, if there are no vibration isolators 2, 4, and 5, the vibration of the vibration isolating member 1 will be
As shown by the solid line A in the figure, the vibration increases when the rotation speed of the rotating machine 7 is low, but if the vibration isolators 2, 4, and 5 are provided, the vibration of the vibration-isolated member 1 will be reduced as shown by the broken line B in Fig. 8. This can be suppressed even when the rotational speed of the rotating machine 7 is low. Furthermore, the above effects can be expected even when the stationary member 3 vibrates due to an earthquake or the like. Furthermore, although the ambient temperature of the rotating machine 7 illustrated in FIG. 7 often changes greatly depending on the climate and operating conditions, the vibration isolating fluid 5 such as high viscosity silicone oil is stable against the above changes and is Capacity is almost constant and reliability is high.

[Brief explanation of the drawing]

Figures 1A and B are longitudinal cross-sectional side views showing conventional dampers; Figure 2 is an explanatory diagram showing the vibration direction of structures, etc.;
Fig. 3 is a side view showing an embodiment of the vibration isolating device according to the present invention, Fig. 4 is an enlarged longitudinal sectional side view thereof, Fig. 5 is an explanatory diagram showing the vibration isolation characteristics of a conventional damper, and Fig. 6 is the proposed vibration damper. An explanatory diagram showing the vibration isolating characteristics of the vibration isolator, FIG. 7 is a side view showing a specific example of the proposed vibration isolator applied to a vibration isolating member that supports a rotating machine, and FIG. FIG. 3 is an explanatory diagram showing anti-vibration characteristics. 1... Vibration-isolated member, 2... Inner cylinder, 3... Stationary member, 4... Outer cylinder, 5... Vibration-isolating fluid.

Claims (1)

[Scope of utility model registration request] It has an inner cylinder fixed to a vibration-isolated member such as a structure, and an outer cylinder fixed to a stationary member such as a frame, and the inner cylinder and the outer cylinder have a certain amount of space in all directions. 1. A vibration isolating device characterized in that the hollow space is filled with a vibration isolating fluid such as high viscosity silicone oil.