| 摘要 |
A rotary drive apparatus having a drive shaft driven by a pair of start-and-stop rotary elements. Each element has a plurality of angularly spaced vanes which are interspersed with associated vanes on the drive shaft to form substantially sealed fluid chambers. Gas compression and expansion in alternate fluid chambers produced by relative rotational movement of the rotary elements with respect to the shaft acts to drive the shaft at a relatively constant velocity.
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