Hydraulic shock absorber

FIELD: machine building.

SUBSTANCE: hydraulic shock absorber comprises a reservoir with an operating cylinder filled with a working fluid. Inside the cylinder there is a piston installed movably with valves. The piston is rigidly fixed on the stem interconnected with the protective jacket. The working cylinder and the protective jacket are made of diamagnetic material. The protective jacket contacts with its inner circular surface with the responsive surface of the working cylinder via a row of revolution solids. In the space between rows of solids of revolutions inside the specified protective jacket there is a ring rigidly fixed, made of a permanent magnet. The ring interacts with its magnetic field via an air gap and a wall of a working cylinder with a cylindrical circular generatrix surface of a magnetoconductive piston of a shock absorber.

EFFECT: increased reliability and simplified design of hydraulic shock absorbers.

3 dwg

 

The present invention relates to mechanical engineering and can be used in the construction of rail and road vehicles.

Known hydraulic shock absorber, which is widely used in various designs of cars (see the book Hydraulic shock absorber car Derborence A.D., M.: engineering 1969), where on page 8 Fig.4 shows a telescopic shock absorber car ZIL-164. This damper consists of a tank and a protective casing, and the working cylinder, in which is movably mounted a piston rod having a series of pressure relief valves, springs and other parts. Despite the efficiency of such absorbers in practice, the latter has a significant disadvantage in that they are equipped with a host of great importance, but with low reliability and structural complexity. This site is a sealing element mounted in the upper part of the shock absorber between the rod chamber and the working cylinder. The violation of the seal of this site is accompanied by leakage of the working fluid and thereby losing its damping abilities.

Also known structure of a hydraulic shock absorber described in the book Design, calculation and design of locomotives. Textbook for students of higher educational establishments, education and training is audacia but the specialty "locomotive engineering" (AA Kamaev, etc. Under the editorship of A.A. Kamaeva-M.: Mashinostroenie, 1981, 351, where pp.96-96 is she presents.. In General, such a shock absorber (hydraulic shock absorber) are constructed similar to the above and therefore the limitations of their own kind.

Therefore, the aim of the invention is to increase reliability, simplify the design and increase the efficiency of its use.

This objective is achieved in that the working cylinder and the protective cover is made of a diamagnetic material and the last contact of its inner circular surface with a mating surface of the working cylinder through a number of rolling elements movably placed on it, and in the space between the rows of rolling bodies mentioned inside a protective casing is rigidly fixed to the ring, made of a permanent magnet interacting with its magnetic field through the air gap and the wall of the working cylinder with a circular cylindrical forming surface conductive shock absorber piston.

Figure 1 shows a General view of a hydraulic shock absorber in section, figure 2 - his-section along AA and figure 3 is a section along the CENTURIES.

Hydraulic shock absorber consists of a working cylinder 1 in which is placed a piston 2 with the valves 3 and 4 and the working fluid 5.The working cylinder 1 is movably placed in a protective cover 6, CH is brennom rolling elements 7 and the magnetic ring 8. The working cylinder 1 has a tube 9 and the bracket 10 and the protective cover 6 to the bracket 11.

Operates hydraulic shock absorber as follows.

It is known that hydraulic shock absorbers, for example, cars sets so that the protective cover to its mounting bracket 11 has been attached hinged to the car body (in the drawings, the dimensions not shown), and a working cylinder 1 with its bracket 10 is also pivoted on the axis of the wheels axis wheels are also not shown in the drawings). When driving with the specified figure 1 is a hydraulic shock absorber and vibration caused by micro - and macroprofile roads, there are two modes of operation: a stroke (compression) and rebound. Consider, first, the compression of the hydraulic shock absorber shown in figure 1. Thus, under the action of dynamic loads of the protective cover 6 moves in the direction of arrow C and his rolling elements 7 will be in contact with the working cylinder 1 in the mode of their rolling, due to the presence of a magnetic ring 8 fixed on the protective casing 6,and resulting magnetic field in the same direction will move the piston 2. The movement of the piston 2 will be some resistance due to the fact that the working fluid 5 will be available in the channel of the piston 2 in the direction of arrow E, will open the valve 4 in the direction of arrow F and will flow in nadporshnevaya Polo is th the working cylinder 1. Therefore, the hydraulic shock absorber campfire dynamic load applied thereto from the body, acting on the arrow C. After the dynamic load acting on the arrow, will disappear under the action of elastic forces caused by the deformation of the spring suspension of the vehicle (suspension of the drawings also not shown), the mode damping hydraulic shock absorber. In this case samity casing 6 begins to move on the arrow C and in the opposite direction, which results in movement of the piston 2 in the same direction due to the presence of a magnetic field generated by the magnetic ring 8. Under the influence of the pressure of the working fluid 5 is the current in the direction of the arrows G and the opening of the valve 3 by the arrow K, which contributes to the flow of the working fluid in podporchennuyu cavity of the piston 2. Such movement of the working fluid creates conditions for damping load, the suspension of the vehicle mode damping of shock absorber. It should put to rest that the design of the alleged technical solutions eliminates the presence of the piston rod 2, and the possibility of its translational motion is provided by the presence of magnetic coupling between him and the magnetic ring 8. The force of interaction between them is determined by the known dependence see the book the PS Kasatkin, M.V. Nemtsov Electrical engineer is. 4th, Rev. Ed., 1983

where-induction in the working gap of the magnetic ring and the piston;

0- the magnetic permeability of the air gap;

S - contact surfaces of the magnetic ring and the piston.

Analyzing recorded the formula it is seen that the force of interaction of the magnetic ring 8 and the piston 2 is substantially influenced by the value In that, as it is known, for permanent magnets is less than 2 Tesla. However, it is also known (see the newspaper Komsomolskaya Pravda from 19.07.02, the article is In Japanese, there is something attractive")that Japan has established permanent magnets, with 1 cm2the square in which you can get force clutch with metallic materials up to 900 kg at a magnetic induction is much more than 2 Tesla. Therefore, using such permanent magnets can be created in the above-described hydraulic shock absorber significant value of the resistance forces in the modes of compression and rebound.

Feasibility advantage of the proposed technical solutions in comparison with known obviously as it simplifies the design of the damper and thereby increases its reliability.

Hydraulic shock absorber consists of a tank with a working cylinder filled with a working fluid, within which is movably piston with to what apanemi, rigidly fixed on the rod interconnected with a protective casing, characterized in that the working cylinder and the protective cover is made of a diamagnetic material and the last contact of its inner circular surface with a mating surface of the working cylinder through a number of rolling elements movably placed on it, and in the space between the rows of rolling bodies mentioned inside a protective casing is rigidly fixed to the ring, made of a permanent magnet interacting with its magnetic field through the air gap and the wall of the working cylinder with a circular cylindrical forming surface of the magnetic-conductive shock absorber piston.



 

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