Vibration damper with a hydraulic end stop

A vibration damper (1) with a hydraulic end stop (2) comprising:

• a cylinder (3) radially limiting a cylinder space (31) filled with damping medium;
• a piston rod guide (51) axially limiting the cylinder space (31) on at least one side;
• a piston rod (4) having a supporting surface (42) and axially guided within the cylinder space (31) and penetrating the piston rod guide (51), the piston rod (4) connected to a piston (6) which divides the cylinder space (31) into a first working space (31a) arranged between the piston (6) and the piston rod guide (51) and a second working space (31b) arranged on the opposite side of the piston (6);
• a control space (71) formed at one end of the cylinder (3), the control space being bounded by an inner wall;
• wherein the hydraulic end stop (2) comprises an end stop ring (8), axially secured to the piston rod (4) and engaging radially around the piston rod (4), and wherein the hydraulic end stop (2) penetrates into the control space (71) in the end stroke region of the piston and axially limits the control space (71) on one side such that a control chamber (71a) is formed inside the control space (71), the control chamber (71a) having a volume and being axially limited by the closure element (5) on the one side and by the hydraulic end stop (2) on the other side;
• the volume of the control chamber (71a) being alterable depending on the axial position of the hydraulic end stop (2) in the control space (71);
• the hydraulic end stop (2) further comprising a sealing ring (9) that is arranged between the end stop ring (8) and the piston rod guide (51), that is supported axially on one side at the end stop ring (8), that engages radially around the piston rod (4), that is mounted in a sliding manner at the piston rod (4), wherein the sealing ring has an outer circumferential surface (91) radially contacting the inner wall of the control space (71);
• wherein the sealing ring (9) comprises at least one radial throttle groove (92) which ensures a defined flow of damping medium between the control chamber (71a) and the first working space (31a) when the hydraulic end stop (2) with the sealing ring (9) moves into the control space (71);
• and
• wherein the sealing ring (9) comprises a plurality of spring tongues (93) which are supported at the supporting surface (42) of the piston rod.