Efficiency analysis of spur gears with a shifting profile

A model for the assessment of the energy efficiency of spur gears is presented in this study, which considers a shifting profile under different operating conditions (40–600 Nm and 1500–6000 rpm). Three factors affect the power losses resulting from friction forces in a lubricated spur gear pair, namely, the friction coefficient, sliding velocity and load sharing ratio. Friction forces were implemented using a Coulomb’s model with a constant friction coefficient which is the well-known Niemann formulation. Three different scenarios were developed to assess the effect of the shifting profile on the efficiency under different operating conditions. The first kept the exterior radii constant, the second maintained the theoretical contact ratio whilst in the third the exterior radii is defined by the shifting coefficient. The numerical results were compared with a traditional approach to assess the results.

[1]  Lars Vedmar,et al.  A General Approach for Determining Dynamic Forces in Spur Gears , 1998 .

[2]  Ramon Sancibrian,et al.  Gear transmission dynamic: Effects of tooth profile deviations and support flexibility , 2014 .

[3]  Hai Xu,et al.  Development of a generalized mechanical efficiency prediction methodology for gear pairs , 2005 .

[4]  Alfonso Fuentes,et al.  Gear Geometry and Applied Theory: Gear Geometry and Applied Theory , 2004 .

[5]  Bernd-Robert Höhn,et al.  Improvements on noise reduction and efficiency of gears , 2010 .

[6]  Emiliano Mucchi,et al.  Elastodynamic analysis of a gear pump. Part II: Meshing phenomena and simulation results , 2010 .

[7]  Alfonso Fernández del Rincón,et al.  Effect of cracks and pitting defects on gear meshing , 2012 .

[8]  A. Fernandez del Rincon,et al.  A model for the study of meshing stiffness in spur gear transmissions , 2013 .

[9]  A. Igartua,et al.  Friction coefficient in FZG gears lubricated with industrial gear oils : Biodegradable ester vs. mineral oil , 2006 .

[10]  K. F. Martin.  A review of friction predictions in gear teeth , 1978 .

[11]  Tsuneji Yada,et al.  Review of Gear Efficiency Equation and Force Treatment , 1997 .

[12]  Luca Landi,et al.  Influence of the addendum modification on spur gear efficiency , 2012 .

[13]  John Kihiu,et al.  Prediction of Overall Efficiency in Multistage Gear Trains , 2011 .

[14]  José I. Pedrero,et al.  Tooth-root stress calculation of high transverse contact ratio spur and helical gears , 2014 .

[15]  Emiliano Mucchi,et al.  Elastodynamic analysis of a gear pump. Part I: Pressure distribution and gear eccentricity , 2010 .

[16]  Bernd-Robert Höhn,et al.  Influence factors on gearbox power loss , 2011 .

[17]  José I. Pedrero,et al.  Analytical Model of the Efficiency of Spur Gears: Study of the Influence of the Design Parameters , 2011 .

[18]  S. H. Loewenthal,et al.  Effect of Geometry and Operating Conditions on Spur Gear System Power Loss , 1981 .