Patent ID: 8006963

Claim:
A pneumatic spring and damper unit, which is arranged between a vehicle body and a vehicle chassis, the spring and damper unit comprising at least two working spaces filled with compressed air, in which the working spaces are each bounded at least partially by movable walls in the form of rolling bellows, and the rolling bellows roll at least partially on the contours of rotationally symmetrical elements, the working spaces being arranged one on top of the other and being connected to one another by means of throttle valves through which there can be a flow, and with a main load direction, in which the pneumatic spring and damper unit is compressed, the volume of one working space is reduced and the volume of the other working space is increased or remains unchanged, the working spaces ( 2 , 3 ) being arranged within a common, pot-shaped, rotationally symmetrical housing ( 4 ) and separated by a rotationally symmetrical piston ( 7 ) with a front side and a rear side, which piston is axially movable within the housing and is located at a head end of a piston rod ( 5 ), with one working space ( 2 ) being arranged at the front side ( 7 a ) of the piston and at least one other working space ( 3 ) being arranged towards the rear side ( 7 b ) of the piston, the piston being sealed and guided by rolling bellows ( 9 , 10 , 11 ) within the housing, and the external surface ( 12 , 13 ) of the piston ( 7 ) and the internal surface ( 14 ) of the housing ( 4 ) each being formed at least partially as rotationally symmetrical rolling contours, and the piston rod ( 5 ) and the piston ( 7 ) being connected to one another by means of a rotary joint.