Efficiency analysis of two degrees of freedom epicyclic gear transmission and experimental validation

Abstract A complete method based on constraint analysis and virtual power is developed in this work. The method is applied to a two-dof epicyclic gear transmission for efficiency modelling and prediction. The power flow diagrams are constructed to obtain possible power flow patterns and to verify the balance of normal power flow and virtual power flow within the system. The theoretical efficiency formulas were derived for the full working range, and further verified by experimental data. It was found that two local loss factors are always coupled together in this device under test, and the same speed ratio may yield different efficiencies depending on the directions of the input angular velocities.

[1]  Yan Guo,et al.  The Efficiency and Experimental Investigation of Differential Gear Train , 2011 .

[2]  Chao Chen,et al.  Complete Efficiency Analysis of Epicyclic Gear Train With Two Degrees of Freedom , 2012 .

[3]  M Schulz.  Circulating mechanical power in a power-split hybrid electric vehicle transmission , 2004 .

[4]  Charles J. Kilmain,et al.  Efficiency of High-Speed Helical Gear Trains , 2003 .

[5]  Xiao Ling Wu,et al.  Investigation on the Transmission Efficiency of the Planetary Gear Train , 2011 .

[6]  Ahmet Kahraman,et al.  Prediction of Mechanical Efficiency of Parallel-Axis Gear Pairs , 2007 .

[7]  Giacomo Mantriota,et al.  Theoretical and Experimental Efficiency Analysis of Multi-Degrees-of-Freedom Epicyclic Gear Trains , 2003 .

[8]  Chao Chen.  Power flow and efficiency analysis of epicyclic gear transmission with split power , 2013 .

[9]  Kukhyun Ahn,et al.  Engine operation for the planetary gear hybrid powertrain , 2006 .

[10]  D. M. Zini,et al.  A Kinematics and Power Flow Analysis Methodology for Automatic Transmission Planetary Gear Trains , 2004 .

[11]  Cheng Wang,et al.  The analysis of power circulation and the simplified expression of the transmission efficiency of 2K-H closed epicyclic gear trains , 2013 .

[12]  Chao Chen.  Power Analysis of Epicyclic Transmissions Based on Constraints , 2012 .

[13]  Namdoo Kim,et al.  Control strategy for a dual-mode electromechanical, infinitely variable transmission for hybrid electric vehicles , 2008 .

[14]  Ettore Pennestrì,et al.  Efficiency Evaluation of Gearboxes for Parallel Hybrid Vehicles: Theory and Applications , 2012 .

[15]  Ferdinand Freudenstein,et al.  The Mechanical Efficiency of Epicyclic Gear Trains , 1993 .

[16]  D. R. Salgado,et al.  Selection and Design of Planetary Gear Trains Based on Power Flow Maps , 2005 .

[17]  He Zhang,et al.  The Power Loss and Efficiency Analysis of a 3DOFs Planetary Gear Box , 2013 .

[18]  Jorge Angeles,et al.  Virtual-Power Flow and Mechanical Gear-Mesh Power Losses of Epicyclic Gear Trains , 2007 .