| 摘要 |
A drive mechanism for rotatably powering a rotary cleaning device for cleaning threshed grain in a combine harvester is disclosed wherein a cleaning cylinder, an infeed mechanism, a fan, and an impeller are rotatable about a common axis of rotation defined by a composite drive shaft that includes a first shaft member having a tubular portion and a second shaft member rotatably received within the tubular portion for rotation independently of the first shaft member. Pulleys keyed to the first and second shaft members rotatably drive the infeed mechanism and the impeller. The fan and the cleaning cylinder are driven by pulleys rotatably mounted on the composite shaft for rotation independently thereof, thereby permitting each component to be driven at different rotational speeds. A mechanism for reciprocatably moving the cleaning shoes during rotation of the cleaning cylinder is also operatively powered by the rotation of the composite drive shaft.
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