Patent ID: 7993204

Claim:
A torsional vibration damper comprising: a primary side; a secondary side which can rotate around an axis of rotation relative to the primary side; a damper fluid arrangement comprising at least one displacement chamber containing a first damper fluid and at least one compensating chamber containing a second damper fluid, wherein the second damper fluid is more compressible than the first damper fluid, wherein rotation of the primary side relative to the secondary side causes displacement of the first fluid from at least one said displacement chamber and compression of the second fluid in at least one said compensating chamber, a first displacement chamber assembly comprising a pair of axially opposed end walls bounding said at least one displacement chamber in both axial directions and a circumferential wall bounding said at least one displacement chamber in one radial direction; a second displacement chamber assembly bounding said at least one displacement chamber in the other radial direction; at least one circumferential recess provided in one of the first and second displacement chamber assemblies; at least one projection provided on the other of the first and second displacement chamber assemblies, said at least one projection engaging in said at least one circumferential recess to limit relative rotation of the first displacement chamber assembly relative to the second displacement chamber assembly.