Abstract: A torsional vibration dampener assembly having resilient means to provide a variable torque output in conjunction with variable damping friction torque. The assembly utilizes a first set of torsion springs to provide a low deflection or displacement rate for a first stage of travel between the input and output members and a second set of springs providing an increased deflection rate for a second stage of travel, and a cooperating cam construction which can be arranged to provide an increase or decrease in damping friction as required in relation to the transmitted torque.

Abstract: A vibration damper for use in a lock-up clutch for a hydraulic torque converter, wherein the clutch provides a direct drive between the engine and transmission of a vehicle in high gear. The vibration damper is designed to be located in a limited space and yet provide relatively large springs for a requisite high torque capacity. The damper is provided with a hub, a driven plate and spring retainer or drive plates; the plates having alternating mounting flanges or legs to be secured to a clutch plate in a common plane and reduce the total thickness of the assembly.