Abstract: A gas spring has a pressure cylinder consisting of nonmagnetic material and closed at two ends, and a piston movably guided in the pressure cylinder. The piston divides the pressure cylinder into a first working chamber and a second working chamber, which are both filled with a pressurized fluid and are connected by at least one flow connection. A piston rod is connected to the piston, extends through the second working chamber and projects out from the second working chamber. An adjusting device is provided to adjust an outward-travel distance of the piston rod to different values, the adjusting device including a magnetic field generating device for generating a magnetic field which is adjustable to various positions along the pressure cylinder, and a shut-off valve influenceable by the magnetic field and designed to block the flow connection between the first working chamber and the second working chamber.

Abstract: A device for damping torsional vibrations in a drive train of a traction drive connecting an internal combustion piston engine and an auxiliary unit, comprising an overrunning clutch (5,30,48) arranged between a driving pulley (2,25,42) and an input shaft (1) of the auxiliary unit or between a crankshaft and a driven pulley of the internal combustion piston engine, characterized in that the overrunning clutch (5,30,48) comprises an inner or outer ring (8,9,28,29,50) made of sheet metal without chip removal on which locking ramps cooperating with locking rollers (10,30a,48a) are formed, and the inner or outer ring (8,9,28,29,50) extends at least on one side beyond a region of the locking ramps to form a raceway for a rolling bearing (6,7,31,32,45,49).

Abstract: A tension device for belts and chains with a tension arm (1) rotatably supported relative to a stationary machine element (6) and spring-loaded by means of a spring (12) against the traction means, on which tension arm, tension means, in particular a tension roller (2), are provided for bearing against the traction means, between the stationary machine element (6) and an element (7), disposed fixedly on the tension arm, are disposed in series a friction element (10) and a resiliently deformable spring element (11), and the resilient deformation of the spring element (11) is limited by the static friction acting between the element (7) fixedly disposed on the tension arm, and the stationary machine element (6) which avoids impermissibly high belt tensions and undesirably high tension arm excursions.