SU1325226A1 - Vibration isolator - Google Patents

Abstract

The invention relates to the protection of objects from vibrations and can be used in instrument and mechanical engineering. The aim of the invention is to increase the vibration-insulating properties when exposed to multidirectional vibrations. This is achieved by selecting the geometry of the dampers 6, their location relative to the housing 1 and selecting the height of the springs 4 in the operating state. The implementation of the internal surfaces of the dampers 6 with a taper greater than the taper of the preloaded springs 4, as well as the equidistance of the parts of the large bases of the dampers 6 facing the housing 1 from the housing 1 and the covers 2 and 3 and the installation of the springs 4 with a certain height in the working state permits to provide high vibration-isolating properties when exposed to multidirectional vibrations, as well as effective damping of multidirectional shock pulses. 4 il. (L oo Yu 01 to to:

Description

The invention relates to the protection of objects from vibrations and can be used in instrument and mechanical engineering.

The aim of the invention is to increase the vibration-insulating properties when exposed to multidirectional vibrations.

This goal is achieved by selecting the geometry of the dampers, their location relative to the body, and selecting the height of the springs in the working state.

FIG. 1 shows a variant of vibration isolator in a closed case, a section; in fig. 2 - the same, in the open case; in fig. 3 is a plot of the coefficient of vibration isolation for a vibration isolator versus relative frequency for multidirectional vibrations; in fig. 4 - energy characteristic of the vibration isolator.

The vibration isolator contains a hollow body 1 with flaps 2 and 3. In the case on conical coil springs 4 there is a support rod 5, to which dampers 6 of material MP are attached and the object to be protected 7. Large bases 8 of dampers 6 are equidistant from the inner wall of case 1 and covers 2 and 3. The inner surface of the dampers b is made with a greater taper than the taper of the preloaded springs. After assembling the vibration isolator, the gaps between the wall of the housing 1 and the outer surface of the damper 6, as well as the large bases of the 8 dampers 6 and the caps 2 and 3 are equal to each other and equal to the gap S between the large bases of the dampers and the outer surface of the springs. The compression of the springs is not less than the magnitude of these gaps.

Vibration isolator works as follows.

With small () arbitrary oscillations of the support rod 5 together with the protected object 7, which takes place in the cut-off frequency range, the dampers 6 move freely without being deformed. Only springs 4 work. There is practically no dissipation in the springs 4 (the solid curve in Fig. 4), and the coefficient of vibration isolation is minimal (see curve C –d, in Fig. 3). With this stiffness

the vibration isolator in the longitudinal direction is equal to the sum of the stiffnesses of the springs 4 installed with preliminary preload rf. With small complex fluctuations of the reference

rod 5, the height of one of the springs 4 increases, which reduces its rigidity, and the height of the other spring 4 decreases, which increases its rigidity. The transverse rigidity of the vibration isolator is generally unchanged.

With large resonant oscillations (6), dampers 6 come into operation, their friction and body parts and springs 4, as well as internal friction provide a large energy dissipation, which ensures the damping of resonant oscillations. The stiffness of the vibration isolator in this case significantly increases due to the stiffness of the dampers 6, which allows the oscillating system to be brought out of the resonance mode.

Claims (1)

Formula of invention Vibro-insulator containing a hollow body with lids, a supporting rod located in it, two conical helical springs interacting with the rod small and with a large base, dampers made of material MP, mounted between the case and the springs, the inner surfaces of which are made conical, differing by the fact that, in order to increase the vibration-insulating properties of their bodies when exposed to multidirectional vibrations, parts of the large bases of the dampers facing the body and their large bases are made equidistant and equidistant from the inner wall of the case and its covers, the taper of the inner 5 surfaces of the dampers are larger than the taper of the compressed springs, and the height of the latter in the working state is determined by the formula five 40 , Alit2Ji) il 4 (2 + Ai) (5 + i) Poisson's ratio for spring material; the ratio of the largest spring diameter to the smallest diameter. 7 Fig2 / g Relative frequency FA 3 about x: Moving FIG.