Browse Publications Technical Papers 2020-01-1016
2020-04-14

Dual-mass flywheel with torque limiter: an effective solution for overtorque suppression in automotive transmission 2020-01-1016

During some critical maneuvers, transmission systems using Dual Mass Flywheel (DMF) may experience overtorques, which could possibly lead to structural damages of the transmission components. A dual mass flywheel is essentially composed by two inertias: a primary mass connected to the engine and a secondary mass to the clutch. The torque delivered by the engine is transmitted through a drive plate and arc springs, the latter absorbing the torsional oscillations coming from internal combustion engine. This paper investigates overtorque issues that affect DMFs in automotive transmission and proposes a solution based on a torque limiter, consisting in a friction clutch inserted between the two masses. This device limits the maximum torque to a specific slipping value. Experimental analysis on a dedicated bench tested the durability of different friction pads and the variation of the slipping torque with time. The paper analyzes the torque limiter benefits through a detailed torsional model implemented in LMS Amesim. This model simulates the transmission torsional dynamics focusing on DMF with torque limiter; overtorque phenomenon are excited by choosing dedicated tests, e.g. fast clutch engagement and uphill vehicle launch on different slopes. Moreover, a simplified MDOF transmission model developed in Matlab/Simulink allows calculating frequency response function, natural frequencies, mode shapes and overtorque limitation. The comparison between the two models proves that even the simplified model is able to predict the main dynamic aspects involved in the overtorque phenomenon and the positive effect of the torque limiter.

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