Research on lubrication characteristics of asymmetric helical gear based on CFD method

Aiming at the asymmetric helical gear injection lubrication, simulation models for coast flank and drive flank injections were established by computational fluid dynamics (CFD). Firstly, the two oil injection methods of the asymmetric helical gear were explained. Then, a mathematical calculation model suitable for gear injection lubrication analysis was established. Finally, the model is simulated by CFD software. The oil volume fraction and pressure at the meshing point during the gear meshing process of the two injection models are obtained. The effects of gear speeds and spray velocities on the oil volume fraction and pressure are analysed. By comparing the two oil injection methods, when the spray velocity is more than 2.7 times the pitch line velocity, better lubrication is obtained by the drive flank injection method. When the spray velocity is less than 2.7 times the pitch line velocity, the coast flank injection method can achieve better lubrication.