Hydraulic-operating shock and vibration absorber and damper

Hydraulically-operated shock and vibration damper which includes a cylinder closed at one end having an interior, a piston which is slideable within the cylinder, said piston being provided with a control port and connected with a hollow piston rod having an interior and extending out of the open of the cylinder, a chamber defined by said interior of said cylinder, and the interior of the hollow piston rod filled with an incompressible damping fluid, and a slideable separating piston in said hollow piston rod defining a space separate from said chamber in which there is a compressible agent, the damping fluid being pressable out of one portion of the chamber, via the control port, another portion of the chamber bounded by the separating piston and compressing the space there behind when the shock absorber is under load, characterized in that the control port consists of a simple jet orifice formed by a through axial opening (11) in the piston (3) and a control pin (15) of varying diameter which extends into the opening of the piston, and in that the damping fluid is non-Newtonian, permanently plastic, homogeneous paste (8) of graphite, 0.1 to 8 wt. % wetting agent, 0.1 to 10 wt. % structural viscosity agent and 40 to 70 wt. % of a fluid selected from the group consisting of polyglycol ether, polyglycol ester, a saturated aromatic ester of carboxylic acid, and a saturated aliphatic ester of carboxylic acid, relative to the total weight of the paste (8).