Piston-cylinder aggregate has ventilation unit with curved channel relative to piston rod in circumference, such that air in annular space executes rotary flow movement, when exchange of air between annular space and surrounding takes place

摘要

The piston-cylinder aggregate (1) has a cylinder (3), in which a piston rod (5) is guided axially in a movable manner. The piston rod is cover by a piston rod cover (7), such that an annular space (9) is present and is compressed upon axial movement of the piston rod. A ventilation unit (19) is provided, which has a curved channel relative to the piston rod in the circumferential direction, such that the air in the annular space executes a rotary flow movement, when an exchange of air between the annular space and the surrounding (21) takes place.