ABSTRACT
A multistage gear drive is composed of two or more gear pairs. The gear ratio of a whole multistage gear drive can also be specified in terms of the rotation vectors of the input shaft, ωin, and the output shaft, ωout. A multistage gear drive should provide a gradation of rotations of the output shaft in a geometrical series with a selected progression ratio and given maximum, ωoutmax, and minimum, ωoutmin, speeds. If the gear ratio of a gear pair is too small, then a larger number of gear pairs is required to provide the required gear ratio. If the gear ratio of a gear pair is excessive, then larger losses of the power being transmitted are observed. Rotational speed charts are used to determine the actual values of gear ratios for all the gearing in the gearbox and to determine the rotational speed of all shafts.
