喷油方位参数对航空直齿轮喷油润滑过程的影响

Influence of spray orientation parameters on spray lubrication process of aero spur gears

通过对航空直齿轮喷油润滑过程的深入分析,对影响齿轮啮合点润滑初始条件的喷油方位参数进行了系统的定义,并在此基础上建立了喷油润滑过程的计算流体动力学(CFD)模型,分别对喷油角度、喷油点位置以及喷油距离3个喷油方位参数的喷油润滑过程进行了计算,得到了齿轮不同啮合瞬时的射流状态,并对不同喷油方位参数下齿轮啮合过程中接触点入口处的油气率与气液总压变化规律进行了比较.结果表明:当采用啮入侧喷油润滑时,为了得到更好的润滑效果,应该使喷油嘴向主动轮偏离一个小的角度,同时使喷油点位置向啮入侧偏离,而对于喷油距离,则应视结构、工况综合考虑而定,但并不是一般认为的越近越好.

Spray orientation parameters influencing lubrication initial conditions of gear meshing point were systematic definied through the analysis of spray lubrication process of aero spur gears,then the computational fluid dynamics（CFD）method of spray lubrication process was established.Three kinds of spray parameter including spray angle,spray point position and spray distance were calculated,jet states were obtained with different meshing instantaneous of gears.The varying rules of the oil/air ratio and oil/air total pressure at the entrance of contact point were compared in the meshing process under different spray parameters.Result show that,nozzle should offset a small angle to driving wheel when spray lubrication using engaging-in side in order to get better lubricating effect,and spray point position should offset engaging-in side,spray distance should take into account the structure,working condition,not general idea that the closer the better.