Abstract: The invention relates to a spring system (2) having two spring units (4a, 4b) arranged coaxially with respect to each other. Each spring unit essentially includes a flexible member (6a, 6b) and a roll-off piston (8a, 8b). The two flexible members (6a, 6b), the roll-off pistons (8a, 8b) and a common outer jacket (10) enclose a common pressure space (14) filled with compressible gas or with a hydraulic liquid. A contamination flexible member (16) is mounted between the roll-off piston (8) and the outer jacket (10) in order to prevent a contamination of the flexible member roll-off surfaces. The contamination flexible member (16) is clamped, on the one hand, in the region of the roll-off piston (8) and, on the other hand, on the outer jacket (10). The effective length of the contamination flexible member (16) is somewhat less than the effective length of the shorter of the two work flexible members (6a, 6b). In this way, the contamination flexible member (16) functions additionally as an end stop (pull stop).

Abstract: In a combined spring and shock absorber system for a wheel suspension of a vehicle comprising tubular rolling bellows arranged between a wheel-support structure and a vehicle body the bellows includes a space filled with a fluid in communication with a hydraulic accumulator. The bellows space is also in communication with at least one additional hydraulic accumulator via a throttle passage and via at least one pre-set differential pressure-control valve ensuring that threshold values for the internal pressure in the tubular rolling bellows are not exceeded in the event of high spring-extension and/or spring-compression speeds.

Abstract: The invention relates to a spring system (2) having two spring units (4a, 4b) arranged coaxially with respect to each other. Each spring unit essentially includes a flexible member (6a, 6b) and a roll-off piston (8a, 8b). The two flexible members (6a, 6b), the roll-off pistons (8a, 8b) and a common outer jacket (10) enclose a common pressure space (14) filled with compressible gas or with a hydraulic liquid. A contamination flexible member (16) is mounted between the roll-off piston (8) and the outer jacket (10) in order to prevent a contamination of the flexible member roll-off surfaces. The contamination flexible member (16) is clamped, on the one hand, in the region of the roll-off piston (8) and, on the other hand, on the outer jacket (10). The effective length of the contamination flexible member (16) is somewhat less than the effective length of the shorter of the two work flexible members (6a, 6b). In this way, the contamination flexible member (16) functions additionally as an end stop (pull stop).

Abstract: In a combined spring and shock absorber system for a wheel suspension of a vehicle comprising tubular rolling bellows arranged between a wheel-support structure and a vehicle body the bellows includes a space filled with a fluid in communication with a hydraulic accumulator. The bellows space is also in communication with at least one additional hydraulic accumulator via a throttle passage and via at least one pre-set differential pressure-control valve ensuring that threshold values for the internal pressure in the tubular rolling bellows are not exceeded in the event of high spring-extension and/or spring-compression speeds.

Abstract: A spring damper device is arranged between a wheel and a body of a motor vehicle. A damper cylinder and a piston rod co-operates with the latter. The damper device is directly articulatable between the body of the motor vehicle and a guide element of the wheel. A spring is tensioned between a body-side and a wheel-side abutment, and the clearance between the abutments is variable by a hydraulic adjusting device and measuring devices operable without contact therebetween to determine an installed length of the damper and clearance of the abutment for the spring. The damper and the spring extend coaxially, with the hydraulic adjusting device comprising a cylindrical housing configured to engage with an annular clearance around the piston rod and is sealed and guided radially at axial ends relative to this piston rod. The cylindrical housing is displaceable relative to the piston rod by hydraulic pressure acting on the annular space.

Abstract: In a height-adjustable shock absorber strut for a vehicle wherein a shock absorber damping cylinder is operatively attached to the vehicle wheels and a piston rod interacting with the damping cylinder extends from the damping cylinder and is provided at its free end with a mounting structure for attachment to a vehicle body and a spring is disposed between the damping cylinder and a spring support disposed on the piston rod, the spring support structure comprises a support member which is axially movably mounted on the piston rod for controlling the support location of the spring and, consequently, the height of the strut under vehicle load.

Abstract: A controllable or regulatable hydraulic shock absorber has a damping-control valve designed as a force-proportional valve and has a closing force variable directly or indirectly via a proportional magnet. The damping resistance brought about by the damping-control valve is consequently very largely independent of the stroke speed of the shock-absorber piston.