Importance

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Abstract

A multiple-power gear drive transmission comprising a planetary differential gear drive including a plurality of drive elements such as sun gear, web gear and internal gear. A gear drive input shaft is connected with at least one of the drive elements; a gear drive output shaft is connected with another of the drive elements; a first positive-displacement machine operable in both directions as pump or motor is coupled to a third of the drive elements for controlling the direction of rotation and speed of rotation thereof; and a second positive-displacement machine operable as a pump or motor is energy-transmissively coupled with the first positive-displacement machine. The planetary differential gear drive includes two of the sun gears which have different diameters; on web gear being arranged dual planetary gears, the gears thereof meshing with the sun gears and with an internal gear wherein the larger sun gear is connected with the gear drive input shaft. Shift couplings selectively connect the second positive-displacement machine in dependence upon the speed of rotation of the gear drive output shaft with either the gear drive output shaft or with the smaller sun gear.

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First Claim