Parametric Studies of Mechanical Power Loss for Helical Gear Pair Using a Thermal Elastohydrodynamic Lubrication Model

Zhang

et al. 2019

Self Cite

In the present study, thermal starved elastohydrodynamic lubrication (EHL) model is developed for a helical gear pair. The influences of inlet oil‐supply layer, input speed, lubricant viscosity, and surface roughness on the lubrication behaviour are investigated. The minimum film thickness, temperature rise of teeth surfaces and oil film, and the friction coefficient are predicted along the line of action (LOA). Results show that the effects of inlet oil‐supply layer, input speed, and lubrication viscosity on the tribological performance are remarkable. Under the starved lubrication, the influence of inlet oil supply on the temperature rise is insignificant. Meanwhile, the effect of surface roughness has been discussed. It reveals that the roughness texture along the entrainment velocity direction has significant influence on the lubrication characteristics. The results provide the tribological guidance for design of a helical gear pair in engineering.

Section: Resultssupporting

confidence: 78%

Section: Model Formulationsmentioning

confidence: 99%

“…The friction coefficient including the effect of rolling and sliding of the tooth surface can be calculated as follows

({, \begin{array}{c} τ_{1} ((), x, y, t) = η * \cdot \frac{u_{1} ((), y, t) - u_{2} ((), y, t)}{h_{f} ((), x, y, t)} + \frac{h_{f} ((), x, y, t)}{2} \cdot \frac{\partial p}{\partial x} \\ τ_{2} ((), x, y, t) = η * \cdot \frac{u_{1} ((), y, t) - u_{2} ((), y, t)}{h_{f} ((), x, y, t)} - \frac{h_{f} ((), x, y, t)}{2} \cdot \frac{\partial p}{\partial x} \end{array})

μ = (||, \iint_{Ω} τ_{1} italicdxdy + \iint_{Ω} τ_{2} italicdxdy) / 2 F ((), t)

where τ 1 and τ 2 are the shear stresses at the two teeth surfaces.…”

Section: Model Formulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Thermal elastohydrodynamic lubrication analysis of helical gear pair under starved lubrication condition

Zhang

et al. 2019

Self Cite

Tribological properties of a helical gear pair considering interfacial slip between lubricant and tooth surface

Deng

Zhou

et al. 2022

Self Cite

In this study, an interfacial slip model including the limiting shear stress is proposed and applied to the thermal elastohydrodynamic lubrication (EHL) analysis of a helical gear pair. The main difference between the proposed model and the classical EHL model is that, the term of entrainment velocity in Reynolds equation is modified. The influences of interfacial slip, thermal effect, initial limiting shear stress and operating conditions on the tribological properties are evaluated. Due to the interfacial slip, the pressure distribution moves towards the inlet region, and the fluctuation distributions of entrainment velocity and film thickness are similar to the trigonometric function. The influence of thermal effect on interfacial slip cannot be ignored, especially in the case of high speed and heavy load. As the input torque and input rotational speed increase, the interfacial slip gradually extends to the whole meshing process.

Tribological characteristics evaluation of a helical gear pair based on the tribo‐dynamic model

Han

Yan

et al. 2023

Self Cite

In this paper, a tribo‐dynamic model of a helical gear is established. For the lubrication sub‐model, a finite line thermal elastohydrodynamic lubrication model of helical gear is adopted. The lateral vibration, axial vibration of gear and torsional vibration of the gear shaft are considered in the dynamic sub‐model. Results show that the tribological parameters of helical gear under the tribo‐dynamic model deviate significantly from that of the quasi‐static model, especially in the engaging‐in region of tooth pair. The friction excitation mainly affects the vibration along the off‐line‐of‐action direction of the gears. The influence of operating conditions on the tribological and dynamic properties of a helical gear pair is significant, especially in the case related to the characteristic frequency of gears.