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The increasing market of the continuously changeable transmissions demands that its characteristics of performance fully are known and constantly developed. Of the some existing constructive types one initially opted to the modeling of the system of pulleys of changeable diameter and leather strap. Knowing, that the transmissions are part of the train of force of any vehicle, the model will go to include the characteristics of exit of the engine, torque and rotation and all the components of an automatic transmission that uses CVTs. The initial objective is to determine the geometry of functioning and the positioning of the leather strap in the CVT. Saber its behavior, if it is playing its role in the excellent way.

Due to the current changes in the automotive industry several new technologies are being developed and the old ones analyzed. The epicyclic gear trains, or planetary gear trains, are important in the automatic transmissions. In this paper a model is presented to describe the behavior of the transmission during the process of gear change. For this the system chose must be fully described, that means the relation among the rotations of the components must established.

Epicyclic gear trains are important part of automotive transmissions. They are present in automatic transmissions and in differentials of most vehicles. The dynamic behavior of a single epicyclic gear is well known, and this study presents the results obtained based in a model of a complete transmission. Initially the Wilson gearbox is presented. The main principles of the model are described. Following, the results of a simulation using the model are shown. Finally, the influence of the inertias in the model are presented and it is done some discussion about it

In this paper a review about epicyclic gear trains (EGTs) or planetary gear trains (PGTs) is initially presented. These gear trains are transmission systems of high kinematic complexity and difficult visualization. However, their advantages are many: they are compact, light, allow high speed reductions, possess high reliability because they have constant engagement, possess bifurcating capacity and power addition, and allow multiple transmission ratio. One of their main applications is the automatic transmission or power trains of passenger cars and other modern vehicles e.g. trucks, buses, etc. Then, some classic automatic transmission boxes e.g. Simpson, GM Hydra Matic 440 PGT, Ravigneaux, etc. and the TEPiciclo software are shown. This software was created to help in design development for automatic transmission of light vehicles with two simple PGTs linked.