Double shock absorber

IPC classes for russian patent Double shock absorber (RU 2081031):

F16F5 - Liquid springs in which the liquid works as a spring by compression, e.g. combined with throttling action; Combinations of devices including liquid springs

B64C25/58 - Arrangements or adaptations of shock-absorbers or springs (shimmy-dampers B64C0025500000; vehicle suspension arrangements in general B60G; shock-absorbers per seF16F)

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(57) Abstract:

The invention relates to shock absorbers chassis aircraft and can be used in the suspension systems of land and water transport. The invention consists in the following. In case 1 absorber placed the plunger 2 with a piston 3, the piston rod 4 with the piston 5. At the bottom of the stem and attached hollow profiled needle 6 with a diaphragm made with calibrated holes "a". On the shank 9 of the needle 6 has a floating piston-Cup 8. The wall 10 of the piston-Cup 8 in the initial position put forward in the hydraulic chamber beneath the plunger 2 on the stroke of the floating piston-Cup 8. 3 C.p. f-crystals, 5 Il.

The invention relates to aviation, particularly to shock absorbers chassis aircraft, and can be used in the suspension systems of land and water transport.

Known dual-chamber absorber (and.with. N 266575 CL 62 B, 40/11) containing the cylinder, the piston and the plunger, which has a gas and the hydraulic chamber, and sealing the piston-glass fixed on it profiled needle, which together with the diaphragm, fixed on the rod, forms an additional guide) camera in stock increases the length of the design of the shock absorber on the value of a column of gas chambers, that entails increasing the mass of the absorber. In some cases (especially in the lever racks) increase length excludes its application.

An object of the invention is to reduce the length and weight of two-chamber absorber.

The technical problem is solved in the claimed device as follows. The diaphragm separating the additional (high pressure) gas chamber from podprumerny hydraulic chamber, mounted on the profiled needle mounted on the bottom of the stem. Sealed floating piston-Cup is placed on the profiled shank of the needle, with its wall is extended in podprumerny hydraulic chamber on the value of its progress.

Profiled needle is made hollow with an internal partition dividing the inner space of the profiled needle into two cavities, the upper of which is connected calibrated holes with satyapragyan hydraulic chamber.

The proposed dual-chamber absorber allows you to have options:
option 2 the same absorber, which reduce the initial pressure of the charging gas chambers, Luggage reverse braking is formed between the inner over the effectiveness of dual-chamber absorber in a wide range of modes, additional regulation by the expiration of the working fluid from podprumerny hydraulic chamber in satyapragyan, floating piston-Cup provided with a thin-walled sleeve with shaped slots;
option 4 is the same absorber, which increase the stiffness of the shock absorber (the ratio of force to move the stem in the cavity profiled needle has a spring-loaded valve, shut-off (up to a certain level of pressure of the working fluid) flow of the working fluid in satyapragyan hydraulic chamber.

In Fig. 1 shows a longitudinal section of the proposed two-chamber of the shock absorber of Fig. 2 variations of the same shock absorber, in which the camera back brake rod placed between the inner surface of the housing and the outer surface of the rod, a floating piston-Cup equipped with a thin-walled sleeve and the profiled needle has a spring-loaded valve; Fig. 3 floating piston-glass, equipped with a thin-walled sleeve with shaped slots, in detail, Fig. 4 chart efforts in the absorber at low speed shaft (static chart compression) of Fig. 5 - diagram of effort in the absorber under dynamic compression with different rsnum 5. At the bottom of the rod 4 is fixed hollow profiled needle 6 with the aperture 7 having an orifice "a". Floating piston-Cup 8 of the working area of F_nmounted on the shank 9 of the profiled needle 6, separates the gas chamber high pressure "H" initial height of the gas column H_hefrom podprumerny hydraulic chamber "P".

The wall 10 of the floating piston-Cup 8, the end area of F_toin the initial position of the floating piston-Cup 8 is advanced in podprumerny hydraulic chamber "P" on the stroke of the floating piston-Cup 8. Between the diaphragm 7 and the floating piston-Cup 8 is formed hydraulic chamber "D".

Luggage reverse braking rod "T" in the original version of the shock absorber of Fig. 1 placed between the inner surface of the shaft 4 and the outer surface of the plunger 2. In the camera "T" is placed a spring-loaded valve 11, which is made with a calibrated hole "b".

Hollow profiled needle 6 has a wall 12, which is located cavity And, soamsawali calibrated holes "d" hydraulic chamber "D". The inner cavity "E" shaped needle 6 hole "f" is connected with the gas chamber high dawned the fluid level.

Gas chambers "B" and "H" are filled with compressed gas through the charging valves 13 and 14.

The shock absorber during forward rod has three modes of operation. The flow of the working fluid in the direct stroke indicated by the arrows "HRP".

1st mode: smooth compression of the shock absorber is displaced air piston area F_RR(the cross-sectional area of the plunger or the second variant of the stem 4) the volume of the working fluid fills the chamber "B" and "T", compressing the gas in the chamber "B" (the "n" in Fig. 4). When the gas pressure in the chamber "B" reaches the initial charging pressure in the gas chamber "H" high-pressure working fluid that is displaced by the air piston F_RRbegins to move and the floating piston-Cup 8, which compresses the gas in the chamber "H" curve "m" in Fig. 4). In a joint compression of the gas chambers "B" and "H" force in the shock absorber is determined by the fluid pressure (equal to the gas pressure in chambers "B" and "H"), acting air piston F_RR.

2nd mode: corresponds to the landing of the aircraft. Dynamic compression of the shock absorber in the energy dissipation involved working fluid. Profiled groove "f" on the needle 6, the calibrated holes "a" in the aperture 7 in the case under Lungarno camera "P", provide the estimated hydraulic resistance and redistribution of the volume of the working fluid flowing into chamber "B", "T" and "D", and hence the compression of the gas chambers "B" and "H". The force in the damper of this mode of operation of the shock absorber is determined by the pressure of the working fluid acting on the piston 3 area F_pplunger 2 and the gas pressure in chambers "B" and "H" acting air piston F_RR(curve P in Fig. 5).

3rd mode: corresponds to the collision of the aircraft with a large speed bump on the runway. Up to this point, the shock absorber is compressed auxiliary load. Compression speed in this mode is higher than the speed of compression of the shock absorber to the second mode.

In the third mode of operation of the shock absorber floating piston-Cup serves as a versatile protective flap.

Shock absorber on this mode works as follows. When hitting an aircraft on the roughness of the sudden compression of the shock absorber. Due to the sharp increase of the hydraulic resistance in the flow of working fluid through the profiled groove "f" on the needle 6, the calibrated holes "a" in the diaphragm 7 and the profiled slot "r" in the sleeve 16 p is, however, the "locking" of the shock absorber prevents the reduction of hydraulic pressure in the chamber P, the movement of the floating piston-Cup 8, moving under the pressure of the total pressure of the working fluid in the hydraulic chamber "P" acting on the end wall 10 of the floating piston-Cup 8 area F_to. The pressure of the working fluid in the hydraulic chamber "P" corresponds to the curve "e" and "W". To limit pressure of the working fluid in the hydraulic chamber "P" reaches the volume of the pressure of the compressed gas in the chamber "N" multiplied by the ratio of the areas of F_n/F_to(curve "l").

To exclude the third cavitation mode of the working fluid in the chamber "D" gas pressure in the chamber "B" acts on the working fluid in the cavity And shaped needle 6, and the working fluid from the cavity And through the calibrated holes "d" flows into the hydraulic chamber "D".

To increase the rigidity of the shock absorber in the cavity And shaped needle 6 can be installed valve 15 (Fig. 2). Curve efforts in the absorber takes the form of Fig. 5 "f". Thus, the shock absorber on the second mode operates as a pneumatic spring high pressure, the force of which depends on the rate of compression of the shock absorber is determined only by the stroke and the ratio of the areas of F_n/F_tofloating piston-Cup 8.

Work Amor is upsetting aircraft. The value of the effort in the absorber is determined by the pressure of the working fluid in the chamber "H" acting on the piston 3 of the plunger 2.

On the return stroke (the flow of the working fluid on the return stroke indicated by the arrows "OH" in Fig. 1 and 2) braking rod is the hydraulic resistance of the working fluid displaced from the chamber T through an orifice in the valve 11.

1. Dual-chamber absorber consisting of a body placed in it hydraulic and gas chambers formed by the plunger, a rod located therein profiled needle attached to its tail floating piston Cup and diaphragm gauge openings, characterized in that the profiled needle is made hollow with a partition inside which separates the upper and aft needles, and gauge openings on its surface for connection of the cavities of the needle respectively with the hydraulic chamber formed by a floating piston-Cup and diaphragm, and with gas high pressure chamber, thus the wall of the floating piston-Cup in the original position put forward in the hydraulic chamber beneath the plunger on the stroke of the piston when nutrena surface of the housing and the outer surface of the rod chamber of the reverse braking.

3. The shock absorber under item 1, characterized in that the floating piston-Cup equipped with a built-in thin-walled sleeve with shaped slits.

4. The shock absorber under item 1, characterized in that it has installed inside in the upper part of the hollow profiled needle spring-loaded valve.