Abstract: A Hybrid Orbitless gearbox combines the high speed capabilities of an Orbitless first stage with the high ratio of a Coupled Orbitless second stage. The two stages share a common set of carriers and offset members for high compactness and simplicity. A Coupled Orbitless second stage may also function on its own. Its all-pinion design supports a variety of engaging members that include gears, chains, sprockets, belts, cables and pulleys, among others. Stepped engaging members further amplify the reduction ratio and variable pitch diameter engaging members provide an infinitely variable transmission ratio.

Abstract: A stiff anti-backlash gear unit comprising two or more high ratio reducer assemblies provides an energy efficient, low backlash, speed reducer. The gear unit is assembled in such a way as to eliminate backlash without any preloading and may be configured as a conventional, planetary or star gear with co-axial, spaced, angled or multiple output shafts.