Helical gears usually operate with their shafts parallel to each other The two

Helical gears usually operate with their shafts

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parallel to each other. There are two types of planetary speed reducers. Single-Stage or Simple Planetary Reducers The simple planetary gear reducer (fig 25-a) consists of a pinion gear called sun gear, which drives three primary planetary gears. The relationship between the number of teeth in the sun gear and number of teeth in the ring gear is as follows: ࠵?࠵?࠵?࠵?࠵? = 1 + ࠵?࠵?࠵?࠵?࠵? ࠵?࠵?࠵?࠵? § Where N = number of teeth § The direction of rotation of the output shaft in single-stage planetary reducers is always the same as that of the input shaft. Differential Planetary Reducers The construction of the differential planetary gear reducer (fig 25-b) is same as the simple planetary reducer except that the primary planetary gears are supported by a free-floating planet carrier which is free to rotate about the sun gear The overall ratio of a differential planetary gear system with a give n gear
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The overall ratio of a differential planetary gear system with a give n gear arrangement is: Reducer Selection There are several factors to be considered in order to properly determine the correct speed reducer for a given application. It is necessary to know if the load will be steady or shock, continuous or
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