Piston cylinder unit for motor vehicle seat, has piston with valve unit blocking overflow of fluid when motion speed of piston is above limited speed, which can move damping unit relative to piston rod in plastically deformable manner

摘要

The unit has a cylindrical pressure pipe, and a piston (5), which is movably guided in the pipe and separates workspaces (3,4) in the pipe. The piston has a valve unit (14) to block the overflow of fluid from one workspace into the other workspace when a motion speed of the piston is above a limited speed. The piston with the blocking valve unit can move a damping unit (16) relative to a piston rod (10) in a plastically deformable manner.