Minimum EHL film thickness in elliptical point contact (rolling-element bearings): h_min / R = 3.63 · U^0.68 · G^0.49 · W^(-0.073) · (1 − e^(-0.68k)).
Formula
$$ \frac{h_\text{min}}{R} = 3.63 U^{0.68} G^{0.49} W^{-0.073} (1 - e^{-0.68k}) $$Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $U$ | Speed parameter | - | velocity, viscosity |
| $G$ | Material parameter | - | pressure-viscosity coeff |
| $W$ | Load parameter | - | contact load |
| $k$ | Contact ellipticity | - | geometry |
Sources
- Hamrock & Dowson (1977).