Torsional vibration damper having a roll spun housing and other improvements.

摘要

A viscous torsional vibration damper of the kind operating on the shear film principle has a roll spun annular channel shaped housing (10) providing an annular working chamber (11) within which is mounted an annular complementary inertia mass ring (12) and a viscous damping fluid substantially fills shear film spaces between the working surfaces of the inertia ring and confronting working surfaces of the housing within the chamber. Working surface area of the housing within the working chamber has a spinning roll burnished finish. A roll formed rabbet provides a shoulder seat (31) on one wall (15) of the housing (13) with an edge portion of a closure (13) sealed thereto. Laser welding permanently secures the closure to the housing.