APPARATUS UTILIZING PLANETARY GEARSET COUPLED TO A CONSTANT TORQUE SPRING

摘要

A gearbox includes a planetary gearset, an input shaft (102) coupled to a sun gear of the planetary gearset, and an output shaft (108) coupled to planet gears of the planetary gearset via a carrier. A constant torque spring (124) is coupled to a ring gear (114) of the planetary gearset. The constant torque spring is capable of preventing the ring gear from moving when a torque at the output shaft is below a threshold. The ring gear winds the constant torque spring in response to the torque exceeding the threshold.