Release time:2021-03-15  Hits:

• Key Words:Elastohydrodynamic lubrication;Behavioral research - Degrees of freedom (mechanics) - Dynamic loads - Dynamic models - Dynamic response - Film thickness - Friction - Gear teeth - Helical gears - Iterative methods - Lubricating oils - Stiffness - Tribology
• Abstract:A twelve-degree-of-freedom tribo-dynamics model for helical gear pair is proposed based on load sharing theory, dynamics and elastohydrodynamic lubrication theory. Time-varying mesh stiffness, bearing stiffness, as well as the friction force are considered when establishing the model. A decoupling method of dynamics and tribology is proposed to solve the lubrication and dynamics models simultaneously. In the iterative loop, the dynamic model predicted the dynamic tooth forces to be used in the lubrication model. In return, the gear lubrication model is provided the dynamic model with periodic friction coefficient. An example gear pair is analyzed using the proposed model and method to demonstrate this coupling relationship between tribological and dynamic behaviors. The results show that the helical gear's dynamic response with consideration of coupling effect is different from the dynamic response under the constant friction factor. Friction force has significant effect on dynamic response that's perpendicular to action line. Dynamic load offects lubrication property greatly. Moreover, when the working rotational speed is approaching the resonance speed, compared with steady load, the distribution and amplitude of oil film thickness, portion of load carried by film, film temperature rise and the friction coefficient the oil film thickness is quite different. The influence of dynamic load on helical gear's lubrication property can't be ignored, so does the influence of time-varying sliding friction on dynamic response.<br/> © 2019 Journal of Mechanical Engineering.
• Volume:55
• Issue:3
• Translation or Not:no