Integrated Thermal and Dynamic Analysis of Dry Automotive Clutch Linings

Author:

Gkinis Theofilos,Rahmani RaminORCID,Rahnejat Homer

Abstract

Optimum operation of clutch systems is dictated by their dynamic as well as thermal performance. Both of these aspects are closely related to the interfacial frictional characteristics of the clutch lining material, which also affects the noise, vibration and harshness response of the entire vehicular powertrain system. Severe operating conditions such as interfacial clutch slip and increased contact pressures occur during clutch engagement, leading to generation of contact heat, and higher clutch system temperature. Therefore, any undesired oscillatory responses, generated during clutch engagement, such as take-up judder phenomenon can exacerbate generated heat due to stick-slip motion. The paper presents an integrated thermal, and 9-DOF dynamic model of a rear wheel drive light truck powertrain system. The model also includes experimentally measured clutch lining frictional variations with interfacial slip speed, non-linear contact pressure profile and generated surface flash temperature. It is shown that severe torsional oscillations known as take-up judder lead to an increased overall clutch temperature. It also shows that ageing of clutch lining material alters its dynamic and thermal performance.

Publisher

MDPI AG

Subject

Fluid Flow and Transfer Processes,Computer Science Applications,Process Chemistry and Technology,General Engineering,Instrumentation,General Materials Science

Reference26 articles.

1. Self-excited vibrations during engagements of dry friction clutches;Bostwick;SAE Trans.,1998

2. Intelligent control of clutch judder and shunt phenomena in vehicle drivelines;Rabeih;Int. J. Veh. Des.,1996

3. Analysis of the influence of engine torque excitation on clutch judder

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