Epicyclic cog belt speed reducer

F - Mech Eng,Light,Heat,Weapons – 16 – H

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74/132, 74/204,

F16H 9/26 (2006.01) F16H 7/00 (2006.01)

Patent

CA 1065163

ABSTRACT In mechanical apparatus for reducing angular speed, commonly known as speed reducers, its is known as a planetary type reducer with a very high reduction ratio; in the order of 1000:1 and high- er, It has concentric input and output shafts, on each of which is fixed a sun cogwheel; there is a third sun cogwheel, also on the main axis, which is fixed to the frame. Each sun cogwheel is connected to a planet cogwheel with a cog belt to form a planetary set, The three planet cogwheels are fast on a common shaft which rotates about its own axis and also about the axis of the input and output shafts; as the planets spin, they are drawn about their respective suns and the teeth on the planet wheels describe an epicyclic path, The speed reduction ratio is dependent mainly on the difference in the relative sizes of the output sun wheel and the sun wheel fixed to the main frame; when there is zero differ- ence the reduction ratio is infinite, Chains and sprocket wheels can be used in place of cog belts and cogwheels in applications where maximum output torque is required.

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