Let K (i EHL) be the stiffness of the elastohydrodynamic friction pair at a certain meshing point i during the meshing process of the spur gear, and refer to the ISO standard for the stiffness C of the spur gear meshing γ The definition method is to define the meshing stiffness CEHL of a spur gear elastohydrodynamic friction pair as:
In the formula, CEHL is the meshing stiffness of the spur gear friction pair, N/(mm · µ m); K (i EHL) is the stiffness of the friction pair at the contact point on the spur gear, N/m; N is the number of selected contact points.