| 摘要 |
A drive for an extruder worm centered on an axis has a substantially closed housing axially juxtaposed with the worm, an input shaft extending along and rotatable in the housing about the axis, exposed axially at an input side of the housing, and adapted to be coupled to a drive motor, and an output shaft rotatable in the housing about the axis, exposed at an input side of the housing, and adapted to be coupled directly to the worm. An axial-thrust bearing is braced between the output shaft and the housing. A planetary transmission centered on the axis between the input and output shafts in the housing has a sun gear rotationally coupled to the input shaft, a ring gear spaced radially outward from the sun gear, a plurality of planet gears meshing with the sun and ring gears, and a planet carrier carrying the planet gears and rotationally fixed to the output shaft. The shafts, sun gear, and carrier are formed at the axis with coaxial axially throughgoing passages. A tube having an output end fixed at the passage of the planet carrier extends along the axis with radial play through the passage of the sun gear and at least partially through the passage of the input shaft and has an input end in the input shaft. A bearing supports the input end of the tube in the input-shaft passage and a seal is provided between the input end of the tube and the input-shaft passage. |
