| 摘要 |
In a twin screw extruding machine, a reduction gear system comprises a casing, an input shaft and two output shafts supported by said casing, each in alignment with a respective one of said screws. A respective first pinion is fitted to each output shaft, these first pinions being offset relative to one another in the axial direction. The first pinion on each of the output shafts is a helical pinion so as to develop a component of force in the axial direction opposite a reaction to the thrust exerted by the associated screw of the extruding machine. Two first helical gears mesh with the first pinion on each of said output shafts at diametrically opposite points thereon. A respective second helical pinion meshes with each first helical gear. Each of the second helical pinions is keyed to a respective thrust shaft. There is a respective thrust bearing at one end at least of each thrust shaft. A respective second helical gear is keyed to each thrust shaft. That on one thrust shaft has teeth inclined in the direction opposite that of the teeth of the second helical pinion on the same thrust shaft. The second helical gear on the other thrust shaft has teeth inclined in the same direction as the teeth on the second helical pinion on the same thrust shaft. A respective third helical pinion meshes with each second helical gear, these third helical pinions having teeth inclined in opposite directions and being mounted on a common shaft. A third gear is keyed to this common shaft. The third helical gears are adapted to be driven by the input shaft.
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