| 摘要 |
This power transmission has a steerable sleeve mounted for pivoting about an axis coaxial with the output shaft of the transmission. The steerable sleeve can be pivoted in either direction with equal torque regardless of rotation of the output shaft. The output shaft has two output gears. Two gear drive trains that are substantially the same interconnect the input shaft to the two output gears of the transmission. In an exemplary embodiment the first drive train includes a ring gear driven by the input shaft, at least one planetary gear, and a sun gear which is the first output gear on the output shaft. The second drive train has a ring gear driven in the opposite sense of rotation from the first ring gear, at least one planetary gear and a transfer gear face substantially the same as the first output gear. The transfer gear is connected to a reversing gear assembly on the steerable sleeve so that torque is applied to the second output gear on the shaft. The two planetary gears are interconnected by a spider which is free to pivot and compensate for motion of the steerable sleeve. The spider assures that advance of one planetary gear drive equals recession of the other planetary gear drive. Since the two drive trains are equivalent and contra-rotating, torques are balanced.
|
