STUDY AND MODELIZATION OF THE COMPLEX MEC HANISMS IN COMPUTER-AIDED-DESIGN

The conception of the mechanical systems becomes very automated in the setting of the Mechanical Computer Aided Design (M.C.A.D.). Actually the geometric modelisation involves Computer Aided Design (C.A.D.). Pa rticularly, the numerical analysis is the origin of Finite Element Met hods (F.E.M.). These two techniques give a real image of calculation r esults; this is due to the discretization methods (stress concentratio n, loads assignation,...). The aim of this work is to study the gear b ox with parallel shafts (reducer of speeds), it includes two steps of reductions. The kinematic chain is constituted by shafts, gears with r ight denture and bearings (ball and cylindrical), who achieve the link with the box. The mean problem is to quantify the dynamic and vibrato ry behaviour in order to qualify the conception of gear box.