Patent ID: 8746661

Claim:
A hydro-pneumatic piston accumulator ( 1 ) for vehicle suspension systems, comprising an accumulator housing ( 2 ) and a separating piston ( 6 ) which is disposed free-floating inside the accumulator housing ( 2 ) in a displaceable manner in a direction of a movement axis ( 4 ), and which separates an accumulator area ( 8 ) for a hydraulic medium from a pressure area ( 10 ) that is filled or is adapted to be filled with a compressible medium, the separating piston ( 6 ) having a guide opening ( 30 ) receiving an elongated guide element ( 32 ), the separating piston ( 6 ) being guided for axial motion on the elongated guide element ( 32 ), which is axially fixed within the accumulator housing ( 2 ), the separating piston ( 6 ) having an axial abutment ( 50 ) with a blind-hole-type cavity ( 52 ) which extends from the guide opening ( 30 ), to receive a free end section of the guide element ( 32 ) that is guided through the guide opening ( 30 ), wherein the pressure in the accumulator area and the pressure in the pressure area act in opposite directions on equally sized pressure areas of the separating piston ( 6 ) and are equal to each other while the separating piston is in an equilibrium.