Patent ID: 7651399
Filing Date: 2010-01-26
Classification: F16F,F16H

Abstract:
1. A torsional vibration damper comprising: a drive side transmission element having a plurality of receiving windows; a takeoff side transmission element having a plurality of receiving windows which are aligned with respective said receiving windows of said drive side transmission element, each said window having a pair of opposed circumferential boundaries; and a plurality of coil springs, wherein each said coil spring has a spring axis which is pre-curved about an axis of rotation of the vibration damper, each said spring being received in a pair of windows of respective takeoff side and drive side transmission elements, each said spring having a pair of opposed final turns separated by a plurality of intermediate turns, each final turn being against a circumferential boundary of a respective window, whereby said drive side transmission element can deflect though a limited angle of rotation with respect to said takeoff side transmission element; wherein each said final turn ends in a free end with an adjacent tip area which is in contact with an adjacent intermediate turn, each said tip area lying radially between said spring axis and said axis of rotation, each said final turn being separated from said adjacent intermediate turn by a first distance which increases from said tip area to a maximum value within a predetermined angle φ following the tip area, said intermediate turns being separated by a second distance, said maximum value of said first distance and said second distance lying radially essentially outermost with respect to said axis of rotation, wherein said maximum value of said first distance, in a load-free state of the springs, is in a ratio of 0.7 to 1.1 to said second distance.