Recirculation is expected to be identified for its possibility to dramatically decrease the efficiency of planetary gear trains(PGTs).However,it exhibits an unexplained connection with the structure,making it challenging to identify without tedious computation through tooth and speed ratios,thus complicating the design process.This study employs a generic model utilizing the mechanical balance principle and reveals the fundamental laws of the previ-ously unexplained connection for parallel-connected ring-sun-type PGTs.Two necessary and sufficient conditions,torque and structure,were proven for multi-stage and two-stage PGTs without recirculation,respectively.This shows that the structure,specifically whether the links are central gears or carriers,and the connections between them directly impact the recirculation of these PGTs.A geometric model representing the structure and kinematics was developed to visualize the power flow.Thus,the recirculation of parallel-connected ring-sun-type PGTs can be predicted without calculations.Our results provide the underlying insights to understanding recirculation from the structural connection viewpoint,thereby contributing to the conceptual design phase where the task is to select the kinematic structure and the gear size is unknown.

Hong Chen;Xiao-An Chen

School of Mechanical Engineering,Xihua University,Chengdu 610039,Sichuan,China;The State Key Laboratory of Mechanical Transmissions,Chongqing University,Chongqing 400044,China

中国机械工程学报

[1]Hong Chen;Xiao-An Chen-.Recirculation of Parallel-Connected Planetary Gear Trains)[J].中国机械工程学报,2022(02):100-110

PGTs

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