Patent ID: 7802776

Claim:
A pneumatic spring and damper unit, which is arranged between a vehicle body and a chassis and has at least two working spaces filled with compressed air, each working space being at least partially bounded by a rolling bellows, each rolling bellows rolling at least partially on the contours of a rotationally symmetrical body 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 of air, the pneumatic spring and damper unit having 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, wherein the two working spaces ( 2 , 3 ) are arranged within a rotationally symmetrical housing ( 4 ) and are separated by a rotationally symmetrical piston ( 6 ) with a front side and a rear side, which piston is axially movable within the housing ( 4 ) and is located at a head end of a piston rod ( 5 ), with the result that one working space ( 2 ) is arranged on the front side of the piston and at least one other working space ( 3 ) is arranged on the rear side of the piston and partially surrounds the piston rod ( 5 ), wherein the piston ( 6 ) and the piston rod ( 5 ) are each sealed and guided by means of rolling bellows ( 7 , 8 , 9 ) within the housing ( 4 ), and in that the external surface ( 10 , 11 ) of the piston ( 6 ) and of the piston rod ( 5 ) and the internal surface ( 12 ) of the housing are each embodied at least partially as rotationally symmetrical rolling contours.