The paper investigates the pressure field and losses in hydrodynamically lubricated contact between axial rings of the pinion and the wheel of a high-speed gearbox under steady-state load. For that reason, a computer program was developed to numerically solve the general Reynolds and energy equations simultaneously, while considering the viscosity-temperature relationship. The Barus empirical equation was used to express a viscosity-pressure relationship as well. For the selected design parameters, dissipative heat in the lubricated contact is shown as a function of transmitted axial force. It is presented that the contact axial force and losses are affected by procedure of the filling of the gap between the rings.

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