Jixie chuandong (Jul 2022)

Analysis and Research of Asymmetric Helical Gear Oil Injection Lubrication Considering Convective Heat Transfer Coefficient

  • Shuai Mo,
  • Xu Li,
  • Zhenxing Zou,
  • Zhiyou Feng,
  • Guojian Cen

Journal volume & issue
Vol. 46
pp. 1 – 6

Abstract

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The computational fluid dynamic (CFD) method is used to study the two injection modes of the non-symmetrical helical gear injection,namely,the injection mode of the entry side and the injection mode of the exit side. The thermal boundary conditions of the injection lubrication simulation model are obtained based on the finite element method. The simulation calculation of the injection lubrication of the asymmetric helical gear is carried out in the CFX fluid simulation software,and the influence rules of the injection parameters on the flow heat transfer coefficient of the tooth face under different injection methods are obtained. Under the method of oil injection lubrication on the meshing entry side,the average convective heat transfer coefficient of tooth surface decreases with the increase of lubricating oil viscosity,but the decreasing trend is slow. Under the method of oil injection lubrication on the meshing exit side, the average convective heat transfer coefficient of the tooth surface will gradually decrease as the viscosity of the lubricating oil increases,but the decreasing degree gets slower gradually. It shows that the average convective heat transfer coefficient of the tooth surface is less and less affected by the viscosity of the lubricating oil. The tooth-to-surface flow heat transfer coefficients of the two oil injection methods,the meshing entry side oil injection method and the meshing exit side oil injection method,both increase with the increase of the fuel injection speed,and the linear change is obvious. The effect of oil injection velocity on the average convective heat transfer coefficient of tooth surface is obvious. Under the conditions of the same lubricating oil viscosity and the same oil injection speed,the meshing entry side oil injection lubrication method and the meshing exit side oil injection lubrication method have a larger tooth flow heat transfer coefficient during the meshing entry side oil injection method.

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