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Patent

Non-linear spring rate clutch damper

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TLDR
In this article, a torsional vibration damper assembly for the transmission of power in a Torsional coupling or automotive vehicle clutch where the coil springs normally disposed between the driving and driven plates of the assembly are replaced by one or more bowed leaf springs to provide a non-linear elastic system.
Abstract
A torsional vibration damper assembly for the transmission of power in a torsional coupling or automotive vehicle clutch wherein the coil springs normally disposed between the driving and driven plates of the assembly are replaced by one or more bowed leaf springs to provide a non-linear elastic system.

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Patent

Elastic shaft coupling with metallic elements

TL;DR: In this paper, an elastic shaft coupling with elastic metallic elements disposed between the driving cams of the coupling members is described, which is similar to the one described in this paper.