LAUSR

Abstract The stiffness and damping models of elastohydrodynamic point contact for herringbone gears with crown modification both in normal and tangential directions are developed. The lubrication performance of crowned herringbone gears in transient non-Newtonian thermal elastohydrodynamic point contacts are investigated to validate the developed models. The effects of operating and geometric parameters of crowned herringbone gear on stiffness and damping of elastohydrodynamic point contact are analyzed. The results show that in herringbone gear transmission, crown modification significantly affects oil film stiffness and damping. Low rotation speed substantially increases the damping. Helix angle contributes to the tangential stiffness and damping. This indicates that rationally selecting parameters can obtain appropriate oil film stiffness and damping to alleviate impact and vibration of herringbone gears.