Patent ID: 6217451
Filing Date: 2001-04-17
Classification: F16F

Abstract:
A torsional vibration damper, comprising:input and output members rotatable with and relative to each other in clockwise and counterclockwise directions about a predetermined axis and respectively including first and second stressing components; andat least one energy storing device arranged to oppose rotation of said members relative to each other and having first and second ends each abutting a first and a second component, said ends being spaced apart from each other in a circumferential direction of said members and said device having a longitudinal axis and comprising a first coil spring between said ends and a second coil spring confined at least in part in a space defined by said first coil spring, said first and second coil springs respectively including a plurality of first and a plurality of second convolutions, at least one of said first convolutions cooperating with at least one of said second convolutions to compel said at least one second convolution to share movements of said at least one first convolution in at least one of said directions, said at least one first convolution and said at least one second convolution overlying each other in said space and in a plane which is at least substantially normal to said longitudinal axis and includes said predetermined axis.