Modelling of Manual Transmission Gear Rattle Phenomenon and Its Impact Factors

Abstract:

Based on basic parameters of vehicle and rotational parameters of real driveline system components, e.g. torsional inertia, stiffness and damping, the coupling model of nonlinear torsional vibration of vehicle powertrain and longitudinal translation was established. With the coupling model, each unloaded gear pair rattling phenomenon was reproduced when the vehicle in gear one was accelerating. Then, gear rattle sensitivity was analyzed for different impact factors. It is shown that appropriate gear backlash and torsional inertia could inhibit the gear rattle phenomenon of manual transmission.

Key words:LuGre tire model; nonlinear torsional vibration; coupling model; gear backlash; equivalent torsional inertia