RU1783191C - Hydraulic damper - Google Patents

Abstract

Usage: mechanical engineering, in particular mechanisms for the smooth stopping of moving parts. SUMMARY OF THE INVENTION: the damper comprises a housing with a transfer channel and a check valve installed therein, a hollow piston with a rod, a compensation chamber with an outlet and an additional piston, a charging device of the compensation chamber in one of the rods. The compensation chamber is located in the hollow piston, radial openings are made in the housing for communication of its cavity with the transfer channel, the outlet is in communication with the radial openings. 1 ill.

Description

The invention relates to mechanical engineering, in particular to designs of hydraulic dampers, and can be used in mechanisms for the smooth stopping of moving parts.

A double-acting hydraulic damper is known, comprising a housing with a glove channel and check valves installed in it, a piston with rods placed in the housing, a compensation chamber with an outlet and an additional piston, and a charging device for the compensation chamber.

A disadvantage of the known damper is limited operational capabilities, low manufacturing quality, and insufficient service life.

The purpose of the invention is the expansion of operational capabilities,

This goal is achieved in that the double-acting hydraulic damper comprises a body with overflow

channel and check valves installed in it, a piston with rods placed in the housing, a compensation chamber with an outlet and an additional piston and a compensation chamber charging device, the piston is hollow, a compensation chamber is placed in its cavity, the charging device is placed in one of the rods, radial openings are made in the housing for communicating its cavities with the transfer channel, and an outlet is located radially in the piston wall for periodic communication with radial openings E.

The drawing shows a damper, a longitudinal section.

The double-acting hydraulic damper consists of an external cylindrical body 1 with an external thread for installing a damper, an internal cylindrical body 2 with a flat on the external

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surfaces to form the overflow channel 3. The housings are mounted one relative to the other by a threaded flange 4. In the inner case 2 there are made radial holes 5 and 6 and transverse annular grooves 7 and 8 connecting the cavities 9 with the overflow channel 3. In the lids 10 and 11 check valves 12 and 13 are installed in the inner case and channels 14 and 15 are made. The piston 16 has two rods 17 and 18, one of which is integral with the piston and the other is fixed therein. On the outer surface of the piston 16 there are wedge grooves 19 and 20. In the bore of the piston there is a compensation chamber 21 filled with pressurized working fluid to compensate for leaks from the damper and separated by an additional piston 22 from the cavity 23 with compressible medium (for example, air) or elastic an element. Compensation chamber 21 communicates with damper cavities through a radial hole 24 in the side wall of the piston. To charge the chamber 21 with liquid under pressure, a charging channel 25 is provided inside the rod 18, provided with a check valve 26 and closed by a cover 27. The liquid is poured into the working cavities of the damper through the filling hole 28

The damper operates as follows.

The damper is mounted on the moving parts of the mechanisms reciprocating. When the extended rod 18 hits the fixed stop, the piston 16 moves to the left, the liquid is displaced from the left cavity 9 through the wedge groove 19, the annular groove 7 and the hole 5 into the transfer channel 3, from where it goes through the channel 15, the check valve 13 formed right cavity 9. At otom

the fluid outflow rate smoothly decreases from a maximum to zero due to a decrease in the cross section of the throttle gap formed by the wedge groove 19 and the annular groove 7. When the outlet 24 passes through the annular groove 8, a short additional liquid flows into the working system from the compensation chamber 21, loss recovery, which inevitably arise as a result of the removal of liquid in the form of a film on the rods. When the moving part of the mechanism is reversed with the damper installed on it, another exposed rod is hit against the stop. The fluid flows from the right working cavity into the left cavity, but already through the wedge groove 20, the annular groove 8, the hole 6 and further through the channels 3 and 14 and the check valve 12. Then the cycle repeats symmetrically.

Claims (1)

SUMMARY OF THE INVENTION A double-acting hydraulic damper comprising a housing with a transfer duct and check valves installed therein, a piston with rods placed in the housing, a compensation chamber with an outlet and an additional piston, and a charging chamber compensation device, characterized in that, in order to expand operational possibilities, the piston is hollow, a compensation chamber is placed in its cavity, the charging device is placed in one of the rods, radial housings are made holes for communicating its cavities with the overflow channel, and the outlet is located radially in the piston wall for periodic communication with radial holes.