Shock absorber

FIELD: transport.

SUBSTANCE: shock absorber cage and rod are jointed together by stack of plates arranged inside said cage. Said stack consists of alternated flexible stationary and moving plates. The number of stationary plates exceeds that of moving plates by one. Said plates are made from identical material and feature identical thickness. Cage has blind bottom and is closed by cover rigidly jointed therewith. Size of moving plates exceeds that of stationary plates by lateral stroke magnitude. Clearance between said plates in said stack is set by cover clamp. Stationary plates and cover have central bores to accommodate the rod. Moving plates are rigidly jointed with rod at their center. Stationary plates are jointed with cage outer edges with a slide fit.

EFFECT: better damping.

1 dwg

 

The invention relates to vibration damping and shock and can be used for vibration isolation of navigation equipment in the aircraft and missile equipment.

Known metal ring vibration absorber containing an element of providentiales material, two diametrically located on the element detachable clip used for attaching the insulator to the base and the insulated object. The elastic element is designed as a closed loop Torah möbius [1].

The disadvantage of analog is low own strength provedeniya elements due to the fact that during the extrusion of the material is significant deformation of the wires of the spiral on the end surface of the corrugated plates.

Also known shock absorber with providentiality elements, consisting of an outer frame and posted inside her platform for the object to be protected, characterized in that, to ensure effective alignment of the center of mass and center of rigidity of the depreciation of the elements, the carrying cables stretched along the sides of the platform, the ends of which are opened through the segments of the rod along the entire length along exterior walls, and the ends of the rods are connected with elastic shoulders torsions, ensuring the tightness of the ropes and elastic deformation under shock [2].

Closest to the claimed may serve as a shock absorber containing ring, the cover and the shaft, the yoke and the rod is connected between an elastic plate [3].

The disadvantages of such a shock are unidirectional stiffness and unidirectional loss factor. In the transverse directions of the known stiffness of the shock absorber is infinitely large, that when random vibration or shock leads to a failure of the protected objects.

Task - exception failure of securable objects.

The technical result - improved shock-absorbing properties.

To achieve a technical result in the absorber containing the clip, the cap and the stem, in which the yoke and the rod is connected between an elastic plate element, the plate element is designed in the form of a package of mobile and fixed elastic plates of the same material and the same thickness, the number of fixed plate made one more, in terms of the movable and stationary plates can have any arbitrary shape and size of the movable plates is less than that fixed by the value of a given move in the lateral direction, the plate pack is placed in the cavity of the cage, closed with one hand is estco connected with the yoke cover, on the other hand, the cavity of the shroud has a blind bottom, the gap between the moving and fixed plates selected by pressing the lid, the movable and stationary plates are arranged alternately, the fixed plate and the cover are in the centre of the hole for the rod is installed, the movable plate in the center is rigidly connected with the rod, and a fixed plate on the outer edges connected to a holder on a sliding landing.

Under the action of vibration or shock loads elastic plate pack is deformed. Under the action of axial or shock loads on the Y-axis of the elastic movable plate affect similar stationary, while the other plates are bent and simultaneously slide relative to each other. The bend provides the stiffness of the shock absorber, and sliding with friction - coefficient hysteresis losses.

The figure 1 shows the absorber device, which consists of the following parts: 1 - clip; 2 - stationary elastic plate; 3 - rod; 4 - mobile-elastic plate; 5 - cover. In the holder 1 has an internal cavity for installation of the plate pack. The movable and stationary elastic plate package made of the same material and the same thickness, the number of fixed plate on one more. In terms of the movable and stationary plates can have any arbitrary shape. Wallpaper is 1 and has on one side the housing bottom, and on the other is closed by a cover screw and allows the preload of the plate pack. The fixed plate 2 on the outer edges connected to the holder 1 on a sliding fit. The movable plate 4 in the center rigidly connected with the rod 3. The movable and stationary plates are arranged in the package in turn. To connect shock absorber to the bottom of the object holder 1 has a flange with holes for connection with vibroseismic device on the outer end of the shaft is also made hole.

The shock absorber works as follows. In the initial state without movement of the elastic deformation of the plate pack is not happening. Temperature changes also do not lead to the displacement of the rod 3, since the fixed plate 2 made one more and deformation of the movable plates 4 completely offset by movements motionless.

To achieve the necessary vibration protection instrument block system with shock absorbers must meet three requirements: 1 - to have a resonance at a given point of the amplitude-frequency characteristics; 2 - given the magnitude of the resonance peak; 3 - given the decline of the amplitude-frequency characteristics of higher operating frequencies. The resonant frequency of the system with shock absorbers, a lowpass filter is defined by the following dependency:

where ωrezresonance is astate system with shock absorbers; ky- axial rigidity of shock-absorbers; η is the dimensionless ratio of the hysteresis losses in the absorber; n is the number of absorbers in the vibroprotection system; m is the mass vibroseismic instrument block. The dimensionless coefficient hysteresis losses η in the absorber is determined by several factors; first, when the elastic bending of the spring plate main factor value of the hysteresis loss is determined by the properties of the material and is given in reference literature, design, and secondly, the extension part to the coefficient of hysteresis loss depends on characteristics of the design, for example, for structures with friction this Supplement is determined by the coefficient of friction. In addition to the main influences on fibrosawomen system, there are side effects. In side effects of vibration and shock loads (x and z) of the inventive shock absorber protects dash units due to the friction force between the plates. Characteristics of the shock absorber in the lateral direction can be structurally made equal in the axial direction.

Sources of information

1. RF patent №2285161. Authors: Minasyan Minas armenakovich and Armen Minasyan Minarovich, CL F16F 7/14, from 10.10.2006.

2. RF patent №2199683. Authors: Ponomarev J.K., Arkhangelsk SV and others, 27.02.2003,

3. RF patent for useful model No. 7854. Mansurov Ibrahim Yahyaoui, Goldin Victor Wolfowitz, CL F16F 7/14, from 27.11.2008.

The absorber containing the holder, the cover and the shaft, the yoke and the rod is connected between an elastic plate element, characterized in that the plate element is designed in the form of a package of mobile and fixed elastic plates of the same material and the same thickness, the number of fixed plate made one more, in terms of the movable and stationary plates can have any arbitrary shape and size of the movable plates is less than that fixed by the value of a given move in the lateral direction, the plate pack is placed in the cavity of the cage, closed with one hand rigidly connected to the cage lid, and the other side of the cavity of the shroud has a blind bottom, the gap between the moving and fixed plates selected by pressing the lid, the movable and stationary plates are arranged alternately, the fixed plate and the cover are in the centre of the hole for the rod is installed, the movable plate in the center is rigidly connected with the rod, and a fixed plate on the outer edges connected to a holder on a sliding fit.



 

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