The Epicyclic gearbox was devised in 1781 (as a sun and planet gear) by James Watt for use in conjunction with his steam engines. The concept was adopted in 1902 by Sturmey and Archer for a ...

At very high gear ratios the efficiency of compound epicyclic gears can be disappointingly low caused by power loss from tooth friction resulting from high meshing speeds and high tooth loads. Oct. 20 ...

AMONG the last group of exhibits in the Inventions Exhibition is the new epicyclic gearing invented by Prof. F. Soddy, the main object of which is to provide for the transmission of large powers at ...

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