In order to study the effects of structural parameters on volume flux and correction factor of jet of nozzles used lubricating gears, single phase flow model of the jet flow field of three dimensional nozzles is simulated by employing the Large Eddy Simulation based on the FLUENT. The rationality of the simulation results of the single phase flow model of jet flow field of three dimensional nozzles were demonstrated by the volume flux of jet oil measured by the method of weighting jet oil. The results indicate that the volume flux of jet is influenced by the orifice diameter, the axial length of orifice and the angle between the axis of nozzle orifice and the axis of upstream flow channel influencing the water head loss. The correction coefficient of quantity of flow increases as the orifice diameter, the angle between orifice axis and upstream axis increase and as the orifice axial length decreases.