| 摘要 |
An inner wheel having a polygonal periphery is arranged for planetary motion within and with respect to the inner polygonal periphery of an annular outer wheel of substantially greater inner diameter than the outer diameter of the inner wheel. The inner wheel is journalled with respect to a carriage structure whereby, upon the carriage structure being propelled either forwardly or backwardly, the inner wheel rides up within the outer wheel to impose a gravitational force therebetween aiding in the propulsion of the carriage structure.
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