| 摘要 |
<p>A sealed torque transmission assembly comprising a casing having a drive shaft rotatably mounted to extend through a wall portion into the casing and terminate with an eccentric end portion which is parallel with the axis of rotation of the drive shaft. An externally toothed, non-rotating driving gear is mounted on a bearing on the eccentric end portion and held against rotation by an anti-rotation sleeve which is coupled by involute teeth at one to the casing and at the other end to the driving gear. A flexible bellows around the drive shaft seals the externally toothed, non-rotating drive gear to the casing. An internally toothed driven gear, having a greater number of teeth than the driving gear and teeth which mesh with at least one tooth of the drive gear, is mounted on a driven shaft which is also mounted for rotation in a wall portion of the casing. Rotation of the drive shaft causes the driving gear to move around on the eccentric end portion while being held against rotation by the anti-rotation sleeve so that the teeth of the drive gear sequentially engage teeth of the driven gear and rotate the driven gear and driven shaft at a reduced rate to that of the driving shaft. The driving gear moves in a plane normal to the axis of rotation of the drive shaft thus minimizing flexing of the flexible bellows and increasing the life of the flexible bellows.</p> |
