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The main objective of this study is to measure the torsional stiffness of automotive transmissions. This activity is important to provide data related to the elasticity of the vehicle powertrain and contribute to create a national database for this parameter. The transmission torsional stiffness value is an input data of the software Dyfasim that is used to predict (estimate) the resonances of the vehicle powertrain. This analysis leads to a better understanding of required design parameter of clutches. Further, the statistical method Measurement System Evaluation - MSE was applied in the planning and execution of tests. The MSE methodology ensures that the bench is robust for variations common to the usage, such as the influence of the operator, input force and gear ratio.

A proper way to innovate consists in identify some kind of customer dissatisfaction and within this observation the companies ought to develop products which will be acceptable by the market. Only in this way, companies will be able to stand out in front of their competitors and the innovative companies can create new needs and valuable knowledge. More and more, the automotive vehicle consumers tend to opt internal combustion engines which use chain drive in their timing system, since the chain drive system presents high durability, avoiding the usual maintenance common to the belt timing system. The necessity of developing parts which increase the efficiency and minimize the fuel consumption, noise and vibration in the timing chain drive system lead the study and comprehension of some physical phenomena. It is inherent to the chain drive system the fluctuation of the angular velocity between shafts, this feature is known as “polygonal action”.