Patent ID: 7886882
Filing Date: 2011-02-15
Classification: B60G,F16F

Abstract:
1. A pneumatic spring damper unit ( 1 ) with an extensionstage and a compression stage, having at least one moveably mounted expeller piston ( 2 ) and two expeller chambers ( 3 , 4 ) whose volumes are increased or decreased depending on the direction of movement of the expeller piston ( 2 ) and which are connected to one another by means of overflow ducts ( 6 , 7 ) in which a plurality of unidirectional throttle valves ( 16 , 16 ′, 16 ″, 17 , 17 ′, 17 ″, 17 ″′) are arranged with differing valve characteristics, with at least one of the throttle valves ( 17 ) being configured to damp natural frequencies in the range from 1 to 1.5 Hz, and at least one other throttle valve ( 17 ′) being configured to damp natural frequencies in the range from 10 to 40 Hz, wherein at least four throttle valves (