SU1203263A2 - Plastic shock-absorber - Google Patents

Description

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The invention relates to mechanical engineering, in particular, to means of protecting objects subjected to shock loads — shock absorbers whose action is based on the use of plastic deformation of a material, and can be used in the construction of earthquake-resistant structures, the automotive industry and other branches of technology. auth. St. No. 1087716,

The aim of the invention is to increase the energy intensity and efficiency of the plastic shock absorber.

1 shows a plastic shock absorber in the initial position, a longitudinal section; 2 and 3 are the same, in the intermediate stages of deformation; 4 is the same in the final stage of deformation; figure 5 - section aa in figure 1.

The device contains the upper arm 1, made in the form of a flared cover covering the connected external energy-absorbing element 2, and the lower base 3, in which annular annular concentrically arranged grooves 4 are made. In these slots, the outer 2 and internal 5 and 6 energy-absorbing elements of various heights, made in the form of hollow cylinders.

At the free ends 7 of the internal energy absorbing elements 5 and 6, partitions 8 and 9 are installed, rigidly connected with the annular inserts 10 and 11 and dividing the volume of the shock absorber into successively decreasing cavities 12-16, in the partitions 8 and 9 and the base 3 are calibrated holes 17 and 18, connecting these cavities in series, the calibrated holes 8 in the base 3 are made in the form of channels. Cavities 12 and 13 are filled with plastic material 19.

The shock absorber works as follows.

Under the influence of a load, it first loses stability and oscillates mechanically plastically externally.

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The research institute has an energy-absorbing element 2; in this case, compression occurs in the optic plastic material 19 through calibrated holes 17 in the partition g 8 from cavity 12 into cavity 13, and from cavity 13 through calibrated holes 18 in lower base 3 into cavity 15 (FIG. .2).

Next (FIG. 3), the internal energy absorbing element (plastic element 6) continues to bulge, and the element 2 continues to bulge, and the plastic material 19 is squeezed through the calibrated holes 17 in the partition 9 from the cavity 15 into the cavity 16, corresponding to the internal volume of the internal energy absorbing element 5 In the annular cavities 13 and 14, the flexible material 19 undergoes a change in the shape of its volume and is additionally partially squeezed through the holes 18 from the cavity 13 into the cavity 14.

At the final stage of deformation (Fig. 4), all the energy-absorbing elements jointly bulge, and into the flexible material 19 moves into the cavities 13, 14 and 16, which change with em. its shape, and carried out a visco-elastic friction on energy-absorbing elements, both from the outside and from the inside of each element.

Thus, due to the joint action of deforming energy-absorbing elements and continuous extrusion of plastic material simultaneously in several cavities through calibrated holes that communicate these cavities, the energy capacity of the shock absorber increases, and due to the smoothness of operation and optimal power characteristics selection of various combinations of calibrated holes, properties in a flexible material, characteristics of energy absorbing elements and volume ratios The cavity capacity increases.

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VNIIPI Order 8400/39 Circulation 897 Subsidiary Branch PPP Patent, Uzhgorod, Projecto st., 4

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Claims (1)

PLASTIC SHOCK ABSORBER by ed. St. No. 1087716, characterized in that, in order to increase energy intensity and efficiency, it is equipped with partitions rigidly connected to the ring inserts, mounted on the free ends of the internal energy-absorbing elements and dividing the volume of the shock absorber on the cavity, in the partitions and on one base, to which all are connected energy-absorbing elements, calibrated holes are made, successively communicating cavities, and the cavities between the other base and its adjacent partition and between the external and neighboring energy absorbing it they are filled with elements of the viscoelastic material. Phi2. 1