| 摘要 |
An ultra-compact planetary drive provides a high reduction ratio and high power transmission without sacrificing the transmission efficiency. The compactness and versatility of the present invention is achieved by using an orbiting ring gear instead of the orbiting spur gears traditionally employed in the construction of the conventional planetary gear drive. The planetary drive of the present invention may be constructed by using gears on friction rollers or combination of gears and friction rollers.
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