Stabilus Gmbh

Rolf Stumm

Rolf Mintgen

Leo Lauderbach

A piston-cylinder assembly has a principal structural group including a cylinder and another principal structural group including a piston rod which has a part-length axially displaceably arranged within the cylinder. The piston rod adopts a default stroke position without external displacement forces acting on the piston-cylinder assembly, the default position being determined by positioning equipment. The positioning equipment includes at least one energy accumulator which acts in the inward and outward movement directions of the piston rod as a function of the stroke position of the piston rod. The at least one energy accumulator includes a tension spring arrangement and a compression spring arrangement. Each of the tension spring arrangement and the compression spring arrangement has a first end which acts in a stationary manner on one of the first and second principal groups and a second end which acts on the other of the first and second principal groups at least with the piston rod outside the default stroke position.

Piston and cylinder assembly

An axially movable switching sealing ring within a groove having an axial width greater than the axial width of the ring, in particular in the piston of a piston-cylinder unit, where the switching sealing ring has sealing surfaces on its upper side surface, lower side surface and radial outer wall surface in each instance. The upper and lower side surfaces each have an axially relieved section adjacent the radially outer diameter of the ring, so that the upper and lower sealing surfaces are formed optimally by only part of the upper and lower side surfaces.

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Koblenz, Germany

Rolf Stumm