Abstract: A hydraulic vibration damper has an inner pipe, a center pipe, and an outer pipe. A piston on a piston rod is guided to be displaceable in a working space that is formed by the inner pipe. Flow spaces that are hydraulically separated from one another and connected with a valve module are formed between inner pipe and center pipe. The center pipe has a radially projecting formed-out part, at which the center pipe is connected with the outer pipe or the inner pipe, via a press fit. The passage openings of the center pipe and of the outer pipe are disposed in the region of the formed-out part. Also, a separation system for hydraulic separation of the flow spaces is situated in the region of the formed-out part. Also provided is a method for the production of a three-pipe system for a vibration damper.

Abstract: A hydraulic dashpot for motor vehicles. It has a cylinder that accommodates a fluid. A shock-absorbing piston travels back and forth in the cylinder and divides it into two displacement chambers. The piston is connected to a rod that extends through a centering component at one end of the cylinder. A hydraulic decompression-stroke limiter consists of a cup-shaped recess below the rod-centering component and of another piston on the piston rod above the shock-absorbing piston. Channels extend through the stroke-limiting piston and are blocked off in the decompression-stroke direction. The object is a less expensive dashpot. The stroke-limiting piston consists of a thin stroke-limiting disk with a diameter slightly shorter than the critical diameter of the recess and resting on a thicker support.