Epicyclic Gear Ratios
Epicylic Gears - Ratio Calculation.
Purpose of Calculation - To calculate the ratios of various epicylic gear arrangements.
Calculation Reference - Roymech.org.
Calculation Validation - On my webpage as identified above I have illustrated three methods of obtaining the required ratios. I have also checked the ratios against Machinery's Handbook 27th edition page 2115.
Introduction - An epicylic gear is a planetary gear arrangement consisting of one or more planet (epicyclic) gears (P) meshed and rotating round a central sun gear (S). The planet gears are also meshed and rotate within an internal ring gear (A). The planet gears are fixed to a planet carrier-crank arm ( L ) designed to rotate on the same centre as the sun gear. Only one planet-carrier /crank arm is used in a single epicyclic gear train. This complicated arrangement (see below) has a number of modes of operation depending on which members are locked. Epicyclic gears can be based on spur gears, helical gears, or bevel gears.
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