In order to explore the optimal location of lubrication nozzle for spur gear with high linear speed,the computational fluid dynamics transient simulation method was used to conduct a single-phase flow gas field simulation analysis of the gear meshing at different linear speeds.The pressure distribution and airflow motion law around the meshing area and tooth profile of the gear pair was revealed.According to the law of airflow motion,a method for determining location of lubrication nozzle was proposed,and the effectiveness of the method was verified by the simulation analysis of two-phase flow transient oil jet lubrication.The results show that with the increase of gear linear speed,the pressure difference in the gear meshing area has a linear increase trend,the air barrier effect is more obvious,the radiation range is wider.The weakest trace formed by the “meeting” of the two swirling airflow gradually slopes towards the pinion.The optimal location of lubrication nozzle can be determined by whether the airflow velocity streamline of the nozzle to be selected can enter the gear meshing area.The lubricating nozzle is preferably arranged in the area of the gear meshing side and the end face angle is 0°.When the jet direction of the nozzle is consistent with the flow line of the optimal injection point,the gear lubrication effect is well.