SU934072A2 - Shock-absorber - Google Patents

Description

(54) SHOCK ABSORBER

one

The invention relates to damping devices and can be used to protect electronic equipment (REA) from vibrations, shocks and overloads from a mobile vehicle.

According to the main author. St. USSR No. 752072 is known for a shock absorber comprising a cylindrical body, a support element placed in the case and intended to communicate with a depreciable object, tapered helical springs mounted between the case and the support element, and a damper which is a body of rotation fixed to the support element with a concave surface, flanges along the ends, having thin-walled longitudinal ribs evenly spaced around the circumference, and toroidal of mesh material in the form of elastic hollow sectors rigidly fastened once eznoy annular axis from the lateral surface of the housing so that each sector is located between the longitudinal ribs, and in. The cavities of each sector are fitted with curved diaphragms located in planes perpendicular to the axis of the shock absorber 1.

This shock absorber is designed in such a way that, under the action of short-term overloads, it provides REA vibration protection in the region of resonant frequencies, which degrades its vibration protection functions and leads to distortion of technical characteristics, and reduces the overall performance of the shock absorber.

ten

The purpose of the invention is to increase the efficiency of vibration damping by eliminating the effects of damping at resonant frequencies.

This goal is achieved by the fact that

15, the inner surface of each hollow sector of the toroidal element with respect to the diametrical axis of symmetry is made a protrusion whose height is chosen equal to the amplitude of external oscillations at frequencies,

Claims (2)

20 close to resonant, in the middle part of the height of the body of rotation there is an annular groove, the width of which is greater than twice the height of the protrusion, and the surfaces of the body of rotation and the toroidal element surrounding it are located at a distance equal to the height of the protrusion. FIG. 1 shows a shock absorber, a longitudinal section; in fig. 2 shows section A-A in FIG. one; in fig. 3 - a hollow sector, top view; in fig. 4 - the same cross section. The shock absorber comprises a cylindrical body 1, a support element 2 placed in the body 1 and intended to communicate with a depreciable object, conical spio. rych.chye spring 3 and 4, installed between the housing I and the support element 2. The damper damper is a rotating body 5 fixed to the supporting element 2 with a concave surface 6 and flanges 7 and 8 along the ends. The body 5 of rotation and has thin-walled longitudinal ribs 9, 10 and 11, evenly spaced around the circumference. Between the rotational body 5 and the body 1 there is a toroid-shaped element made of mesh material “MP”, made in the form of hollow elastic sectors 12, 13 and 14, rigidly fastened by a split annular axis 15 with the side surface of the body 1 in such a way that each sector is 12, 13 and 14 located between the respective longitudinal ribs 9, 10 and II. To fix the movement of the sectors 12, 13 and 14 relative to the housing 1, two annular parallel projections 16 and 17 are made on the latter. In the cavity of each of the sectors 12, 13 and 14 there are curved diaphragms 18 located in planes perpendicular to the axis of the shock absorber. The separate surfaces 19 and 20 of the diaphragms 18 are located at the same distance from each other, i.e., they are made equidistant. A protrusion 21 is made on the inner surface of each hollow sector 12, 13, and 14 of the toroidal element with respect to the diametrical axis of symmetry; its height is chosen to be equal to the amplitude of external oscillations at frequencies close to resonant ones. In the middle part of the height of the rotation body 5, an annular groove 22 is made, the width of which is greater than the double height of the protrusion 21, and the surfaces of rotation 5 and the surface 23 enclose its toroidal element in the form of sectors 12, 13 and 14 are located at a distance equal to the height of the protrusion . The shock absorber works as follows. When vibrations with a frequency close to resonance are applied to the depreciable object, the oscillation amplitude increases, and the hollow sectors 12, 13 and 14 of the rotation body 5 with their projections 21 slide along the annular groove, which in this case plays the role of a guide, and with its working surfaces 23, smoothly approaches the concave surface 6 of the rotation body 5., and the annular groove 22 provides a uniform gap between the interacting surfaces 6 and 23, which eliminates the swinging of the rotation body 5 and the appearance of side eigenfrequencies rtizatora. When the support element 2 moves, for example, downward, the upper parts of the interacting surfaces 23 of the hollow sectors 12, 13 and 14 and the concave surface 6 of the rotation body 5 contact, and the deformation of the hollow sectors 12, 13 and 14 of the bending vibrations of these sectors begins and by increasing compression of the sectors 12 13 and 14 under pressure from them on the upper side of the side surface and one of the respective flanges 7 and 8 of the rotation body 5. The interaction of each of the hollow sectors 12, 13 and 14 through the protrusion 21 with the annular groove 22 of the rotation body 5 is carried out through the frictional forces and the elastic pressure of these elements. However, these forces are insignificant, and the geometrical parameters of these elements are chosen so that practically these forces do not participate in the work of the shock absorber. They only allow the damping device to be smoothly turned on or off, as well as smoothly alternating damping. In this case, under the action of both spiral springs 3 and 4, the protrusion 2 in a state of static load is always located near the central part of the rotation body 5, and when the shock absorber is operating, this protrusion 21 deflects up and down along the axis of the shock absorber by an amount equal to the amplitude of oscillations. As is known, the amplitude of vibration of moving objects decreases with increasing frequency. At resonance frequencies, the amplitude of the relative oscillations of the depreciable object is approximately equal to the amplitude of the exciting oscillations. Therefore, the protrusion 21, made in height equal to the sweep of the exciting vibrations at a frequency close to the resonant one, keeps the interacting surfaces of sectors 12, 13 and 14 and the concave surface 6 of the rotation body 5 at a distance equal to its height. At the same time, the hollow sectors 12, 13 and 14 slides along the annular groove 22 on the rotation body 5 within the width of this groove. When the shock absorber operates at resonant frequencies, the probability of occurrence of the spectrum of natural frequencies, which could occur during collisions of the interacting surfaces of the damper and during the wobble of hollow sectors, in the case of uneven gaps, is excluded. The formula of the invention St. No. 752072, characterized in that, in order to increase the effect of damping pv oscillations; By excluding the influence of damping at resonance frequencies, a protrusion is made on the inner surface of each hollow sector of the toroidal element with respect to the diametrical axis of symmetry; which is greater than the double height of the protrusion, and the surface of the body of rotation and the toroidal element enclosing it are located at a distance equal to the height of the protrusion. Sources of information taken in, hymania during the examination 1. USSR author's certificate No. 752072, cl. F 16 F 3/00, 1978 (prototype). one / -v 0l / .f / A-l fj /four Fg / g.2 If: .. fug. fg ff 18