Projeto preliminar de um sistema de tração 4x4 aplicado a um veículo baja SAE

Abstract

The main purpose of this study is the development of a preliminary project in the theoretical and numerical scope of a mechanical 4x4 traction system for application in a BAJA SAE vehicle. The vehicle of the TOBAJA team from the University of Caxias do Sul was listed as a reference, which currently has a 4x2 traction configuration. In addition to the implementation of the 4x4 system being a possible obligation in future competitions, according to related works, the improvement of vehicle mobility under adverse terrain conditions was justified, especially where there are traction losses. Through a decision matrix, it is possible to list the type of system most suitable for the current reality of the team. Evidencing a comparison between the 4x2 and 4x4 systems, an algorithm was developed through a programming software in order to advise the calculations of the vehicle's longitudinal dynamics, being essentially represented by Newton's 2nd Law. The algorithm, in turn, also contributed to obtaining the ideal configuration of gearing of the transmission box. Subsequently, based on AGMA standards, pre-dimensioning calculations were performed for the main elements of the powertrain assembly. In short, the preliminarily designed components had adequate functionality requirements before a stipulated annual testing and competition period. Regarding the 4x4 system, negative perspectives were evidenced in the context where the vehicle operates under homogeneous road conditions. Nevertheless, it is possible to verify a superior performance of the implemented system under soil circumstances constituted by different friction coefficients. [resumo fornecido pelo autor]