| 摘要 |
The invention relates to a piston-cylinder unit (1) comprising a cylinder (3) in which a piston rod (5) is axially movably guided. The section of the piston rod located outside the cylinder (3) and a protective sleeve (19) enclosing the piston rod determine an annular space (21) which is connected to the surroundings via at least one air exchange connection, wherein the protective sleeve (19) has a filament structure which is permeable to gases.
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