SU1010341A1 - Shock absorber - Google Patents

Abstract

AMORTIZER containing two parallel bases, between which coaxially mounted spring and damping element are located, characterized in that, in order to increase the range of perceived loads, on the surface of the damping element facing the spring, protrusions are made, which are located along a helical line between the coils of the spring with a gap .

Description

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The invention relates to mechanical engineering, namely to means for damping vibrations.

A shock absorber is known, which contains two parallel bases, between which coaxially mounted springs and a damping element are arranged.

in the form of a cylinder

A disadvantage of the known device is a narrow range of perceived loads.

The purpose of the invention. is an increase in the range of perceived loads.

This goal is achieved by the fact that in the shock absorber containing two parallel bases, between which the coaxially mounted spring and the damping element are located, protrusions are arranged on the surface of the damping element facing the spring with helical lines between the coils of the spring with a gap.

The drawing shows the shock absorber, a longitudinal section, a general view.

The shock absorber contains two parallel bases 1 and 2, between which coaxially mounted spring 3 and damping element k are made, made of a material having internal friction forces L

On the outer surface of the damping element C, the protrusions 5 are arranged along a helical line between the turns of the spring 3 with a gap D.

The damping element k is fixed to the bases 1 and Z with screws 6, 7 and bushings 8 and 9.

The spring 3 is attached to the bases 1 and 2 in special sockets (not shown in the drawing) and is secured against turning by pins 10.

The shock absorber works as follows.

When a vibration load with a frequency of 10 and 15 Hz and above and a small oscillation amplitude deforms only the spring 3 of the shock absorber, the profiled lip 5 of the damping element i does not participate in the work, since there is a gap L between them and the coils of the spring 3. The characteristic of the shock absorber is linear, its rigidity is equal to the rigidity of the spring 3 and may be small, therefore, the natural frequency of the shock absorber is also small, i.e., the characteristic is soft.

Under the action of a shock load with a frequency of 6-10 Hz and a large amplitude, profiled protrusions 5 damper of the compressing element enter the work. ma s between the turns of the spring 3. The characteristic of the shock absorber becomes significantly nonlinear, i.e., the rigidity of the shock absorber increases several times and the natural frequency of the system also increases.

Thus, the damping element i with profiled protrusions 5, which interact with the coils of the spring 3, after selecting the gap D, serves as an additional elastic element connected in parallel with the main outer element, spring 3 and as a mechanism for forming the damping force using internal friction in the material, which increases the range of perceived loads, and at the same time the shock absorber has a variable stiffness.

The application of the proposed shock absorber provides the possibility of protecting the onboard equipment of large weight on the aircraft from both vibration and shock loads, expanding the range of the nominal load.

Claims (1)

SHOCK ABSORBER, comprising two parallel bases, between which are coaxially mounted a spring and a damping element, characterized in that, in order to increase the range of perceived loads, on the surface of the damping element facing the spring, protrusions are arranged located along a helical line between the spring coils with a gap . * <10 Under the action of a vibrational load, with a frequency of 10 and 15 Hz and higher and a small oscillation amplitude, only the shock absorber spring 3 is deformed, the profiled projections 5 of the damping element 4 are not involved in the operation, since there is a gap Δ between them and the turns of the spring 3. The characteristic of the shock absorber is linear, its stiffness is equal to the gesture ^{, 0 of the} bone of the spring 3 and may be small, therefore, the frequency of the natural oscillations of the shock absorber is also small, i.e. soft characteristic. When a shock load act, ca ¹⁵ rangefinders 6-10 Hz and a large amplitude in the work profiled projections 5 enter the damping element 4 urchins * toiling between the spring coils 3 "suspension characteristic becomes nonlinear nificant sous ^20, i.e., the stiffness of the shock absorber increases several times and the frequency of natural oscillations of the system also increases. ? ⁵ Thus, the damping element 4 with profiled protrusions 5 that interact with the coils of the spring 3, after selecting the gap Δ, serves as an additional elastic ³⁰ element connected in parallel with the main elastic element, the spring 3, and as a formation mechanism damping force using internal friction in the material, which increases the range of perceived loads, while the shock absorber has variable stiffness. The use of the proposed shock absorber makes it possible to protect high-weight avionics on an aircraft both from vibration and shock loads, and the extension of the nominal load range.