Vibration damping device, in particular torsional vibration damper and process for controlling hysteresis

A propulsion system for vehicles with a torsional vibration damper, said torsional vibration damper (2) comprising:

• a primary rotatable element (3.1);
• a secondary element (3.2) rotatable relative to the primary element (3.1);
• at least one spring device (4.1, 4.N) for torsionally elastic coupling said primary element and secondary element to each other;
• at least one adjustable clutch device (15, 15′), including at least two elements (16, 17;
• 16′, 17′) adapted for frictional engagement with each other, which bring primary and secondary elements (3.1, 3.2) into friction contact;
• and
• a force producing device (39) for producing a controlled frictional engagement of the elements frictionally engaging each other (16, 17;
• 16′, 17′).

A process for controlling hysteresis of a torsional vibration damper, said torsional vibration damper (2) comprising:

• a primary rotatable element (3.1);
• a secondary element (3.2) rotatable relative to the primary element (3.1);
• at least one spring device (4.1, 4.N) for torsionally elastic coupling said primary element and secondary element to each other;
• at least one adjustable clutch device (15, 15′), including at least two elements (16, 17;
• 16′, 17′) adapted for frictional engagement with each other, which bring primary and secondary elements (3.1, 3.2) into friction contact;
• and
• a force producing device (39) for producing a controlled frictional engagement of the elements frictionally engaging each other (16, 17;
• 16′, 17′);
• and
• said process comprising adjusting the strength of the frictional engagement dependent on the load and/or the speed of a propelling component (1.1).

A vibration damping device, comprising:

• a primary rotatable element (3.1);
• a secondary element (3.2) rotatable relative to the primary element (3.1);
• at least one spring device (4.1, 4.N) for torsionally elastic coupling said primary element and secondary element to each other;
• at least one adjustable clutch device (15, 15′), including at least two elements (16, 17;
• 16′, 17′) adapted for frictional engagement with each other, which bring primary and secondary elements (3.1, 3.2) into friction contact;
• and
• a force producing device (39) for producing a controlled frictional engagement of the elements frictionally engaging each other (16, 17;
• 16′, 17′).