Abstract
Theoretical calculation and numerical simulation are used to investigate the lubricating oil demand of spur gears. In accordance with the function of lubricating oil during the meshing process, oil demand is regarded as the superposition of oil for lubrication and cooling. Oil for lubrication is calculated in accordance with meshing and elastohydrodynamic lubrication (EHL) theories. Oil for cooling is obtained from friction heat. The influence of different meshing positions on lubricating oil demand is analysed, and the effects of modulus, tooth number, transmission ratio, input speed and input torque on lubricating oil demand is investigated using a control variate method. Simulation results indicated that oil for lubrication and oil for cooling have two maxima each during a meshing circle. The influences of different gear parameters and working conditions on lubricating oil demand are compared. The results showed that the oil volume for lubrication increases and oil volume for cooling decreases as the modulus, tooth number and transmission ratio of the gear increase, the oil volume for lubrication and oil volume for cooling increases as the input speed and input torque increase.
Highlights
Compared with belts, chains and other transmission devices, gear drives are the most widely used in a variety of engines, such as those in automobiles, ships and spacecraft, due to their high efficiency, compact structure and smooth operation [1]
A series of simulations used to examine the influence of different transmission ratios on the friction coefficient during the meshing process and the variations in the oil volume for cooling at different transmission ratios during the meshing process are shown in Figure 8b,c, respectively
The theoretical calculation of the oil volumes for lubrication and cooling is established in this study
Summary
Chains and other transmission devices, gear drives are the most widely used in a variety of engines, such as those in automobiles, ships and spacecraft, due to their high efficiency, compact structure and smooth operation [1]. The influence of dynamic load on the minimum oil film thickness, pressure distribution and temperature distribution were analysed on the basis of the quasi-static tooth force solved via finite element contact analysis [17]. On the basis of the preceding statement, current studies have explored effective methods for establishing a lubrication analysis model that can realistically and accurately describe the contact state among tooth, the characteristics of oil film and the distribution of lubricating oil. These studies on gear lubrication are based on the condition that the lubricating oil supply and the lubrication state of the gear are known. This study provides guidance for the appropriate design of gear lubrication systems
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
