The calculation of the force transmitted in a gear train is important when it is geometrically related to the number of teeth of the gears or the diameter of action. The speed ratio that is established between the two elements, is related to the speed, the torque developed, and even the acceleration. When a mechanical element is modeled parametrically, it is of greater advantage, because with a change of one mathematical parameter, the model has been adjusted in the equation and parameters table, with this single design the designer has the ability to create a toolbox useful for their own design purposes. This paper shows the performance of a parametric design of a spur gear with SolidWorks CAD tool. With the support of this design, it shows the construction of a simple gear train, the calculation of the speed ratio, as well as its impact on the calculation of the power and torque and how the gear is involved.

Los  programas  educativos  del  Sistema  de  Universidades  Tecnológicas se desarrollan con base en las necesidades del sector productivo, desde donde se deriva el perfil profesional por competencias que debe caracterizar a sus egresados; luego, a partir de la competencia profesional de cada perfil y de la diversidad de contextos de aplicación, se desglosan conocimientos, habilidades  y actitudes  requeridos,  los  cuales  analizan  e integran  las  diferentes asignaturas que constituyen el mapa curricular de una carrera.