Abstract
A planetary gear train is used as a transmission in many fields, because it has a smaller size, a lighter weight and has a larger gear ratio than a conventional gear train. However, the planetary gear train can not drive because of a significant low efficiency. In this study, we theoretically analyzed the efficiency of 2K-H type planetary gear train and presented the condition in which the self-locking occurred. Furthermore, we examined the self-locking of 2K-H type planetary gear train using several gear sets with different teeth number by the running test. As the result, the condition of the self-locking that was analyzed theoretically agreed approximately with experimental result.
