Abstract：Setting up the equivalent torsion model of crank-train, the dynamical excitations of transmission primary shaft such as speed fluctuation and angular vibration were obtained. The dynamical simulation model of a five-level manual transmission was built using the Multi-Body-Dynamic method. Based on the simulation results on the second gear level, the characteristics of Gear Whine which caused by variable meshing stiffness, and the characteristics of Gear Rattle which caused by free inertia and meshing clearance were both discussed. In the mean while, the equivalent torsion model was valid by the experiment torsion vibration results. And the simulation result of dynamical bearing loads due to gear meshing was valid by the gearbox’s surface vibration experiment which was done over the whole engine speed.
2010, Vol. 29 
