Patent ID: 6422131
Filing Date: 2002-07-23
Classification: F16J

Abstract:
A piston pressure device, comprising:a generally cylindrical piston having a piston face end and a piston base, said piston base being of a smaller diameter than said piston face end; a piston shaft having a central axis and an end face facing towards said piston face end; a radially outwardly-opening recess bounded by said piston face end, the outer peripheral surface of said piston base and said piston shaft end face; said piston base being coupled to said piston shaft such that said piston is axially shiftable in the direction of the piston shaft under the force of a pressure medium acting against the piston face, so that the volume of said recess is variable in response to said pressure medium force; a sealing device for sealing between spaces of different pressure, said sealing device being arranged form-closed in said recess between said piston and said piston shaft, so that pressure between said piston and piston shaft is exercised through said sealing device; said sealing device comprising, as a first component, an elastomeric ring and, as a second component, a hollow cylindrical sleeve of a material plastically deformable under pressure, said first and second components ensuring sealing at various pressure differences; and said elastomeric ring having an outer diameter smaller than the outer diameter of said sleeve and being axial-symmetrically embedded in said sleeve so that the elastomeric ring is separated from said piston face end, said piston shaft end face and a cylinder wall to be sealed by said material plastically deformable under pressure.