Splash lubrication characteristics and structure improvement of spiral bevel gearbox for electrical multiple unit
A high-precision flow field simulation model was established by using the moving particle semi-implicit(MPS)method in order to analyze the lubrication mechanism of electrical multiple unit gearbox,taking a certain type of spiral bevel gear transmission gearbox as the research object.The film flow model was introduced to improve the non-slip wall boundary conditions so that the MPS has the function of predicting the flow characteristics of the liquid film.The effects of input gear rotating speed and initial lubricating oil volume on the lubricating oil coverage rate,oil film distribution characteristics and power loss of the inner wall of the gearbox and the gear surface were analyzed.Results show that the lubricating oil coverage and liquid film thickness on the inner wall of the gearbox are mainly affected by the splash effect of lubricating oil,and the gear surface is affected by the splash effect of lubricating oil and its own motion.The power loss analysis indicates that the power loss is positively correlated with the input gear rotating speed and the initial lubricating oil volume,and is more sensitive to high rotating speed.The box structure is improved,the box boss is eliminated and the distance from the output gear is expanded,which can significantly improve the lubrication conditions of the gearbox.
gearboxsplash lubricationthin film flowoil film thicknesspower loss
NETL
NSTL
万方数据
维普
