| 摘要 |
A roll and roll-driving assembly includes an internal stationary shaft and an outer shell surrounding the internal shaft as well as a bearing structure supporting the outer shell for rotation with respect to the internal shaft. A rotary input shaft is coaxial with the stationary shaft to receive a rotary drive from an outside source. A sun gear is fixed coaxially to the rotary input shaft so as to rotate therewith, while a plurality of planetary gears which respectively have axes parallel to the axis of the input shaft and which mesh with the sun gear are uniformly distributed about the axis of the input shaft. An internal ring gear surrounds and meshes with the planetary gears while being supported exclusively thereby so that the internal ring gear can automatically center itself with respect to the plurality of planetary gears while a load is uniformly distributed along a plurality of power-transmission paths extending from the sun gear through the plurality of planetary gears to the internal ring gear. A transmission is operatively connected between the internal ring gear and the shell to transmit a drive from the ring gear to the shell and to automatically compensate for inaccuracies and/or deformations. |
