The figure shows a cloud diagram of the temperature change of the tooth contact in the plane of the rotational speed and the viscosity parameter of the lubricating oil when the backlash Jn=0 mm and the rotational speed n=1 800 r/min are in the state of elastohydrodynamic lubrication and mixed lubrication.

It can be seen from the diagram that the contact temperature of tooth surface increases slowly with increasing torque when the viscosity of lubricant is low under the condition of Elastohydrodynamic lubrication, and significantly increases when the viscosity of lubricant is high.In the area with lower load, the contact temperature of tooth surface does not increase significantly with the increase of oil viscosity, but it increases sharply with the increase of oil viscosity when T is more than 6 N_m.Under the mixed lubrication condition, the contact temperature of the tooth surface increases significantly with the increase of the torque.At the same time, as the viscosity of lubricant increases, the contact temperature of tooth surface decreases but by a small amount.This also reiterates that the influence of lubricant viscosity on the contact temperature of tooth surface is different under different lubrication conditions. Lower dynamic viscosity lubricant is required under elastohydrodynamic lubrication, which can reduce the possibility of tooth surface bonding due to high contact temperature of tooth surface; higher viscous lubricant is required under mixed lubrication to avoid high contact temperature of tooth surface.Degree.