Epicyclic gear stages provide high load capacity and compactnessto gear drives. There is a wide variety of different combinationsof planetary gear arrangements [1, 2]. For simple epicyclicplanetary stages when the ring gear is stationary, the practicalgear ratio range varies from 3:1 to 9:1. For similar epicyclicplanetary stages with compound planet gears, the practical gearratio range varies from 8:1 to 30:1.
This paper presents analysis and design of epicyclic geararrangements that provide extremely high gear ratios. Usingdifferential-planetary gear arrangements it is possible to achievegear ratios of several hundred to one in one-stage drive withcommon planet gears and several thousand to one in one-stage drivewith compound planet gears. A special two-stage planetaryarrangement may utilize a gear ratio of over one hundred thousandto one.
This paper shows an analysis of such uncommon gear drivearrangements, defines their major parameters, limitations, and gearratio maximization approaches. It also demonstrates numericalexamples, existing designs, and potential applications.
- Edition:
- 13
- Published:
- 09/01/2013
- Number of Pages:
- 12
- File Size:
- 1 file , 340 KB
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