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In this paper we perform a review of the planetary gear trains with two central gears, and a planet carrier, used for power sources coupling. The kinematic and dynamic analysis was determined for a simple planetary gear mechanism, with two degrees of freedom formed by two gears that are in external meshing. For the same planetary mechanism, it was determined the mechanical efficiency and the associated internal powerflow direction, which helps identify the planetary gear train with the highest mechanical efficiency.

Kinematic and dynamic analysis of planetary mechanisms with two degrees of freedom used for power sources coupling