The Bearing Lubrication Method Selection Calculator is an efficient engineering tool designed to help users choose the most suitable lubrication method for different bearing applications. By analyzing factors such as bearing type, operating speed, load conditions, temperature, and working environment, this calculator assists engineers in selecting the right lubrication solution, including grease or oil lubrication. The Bearing Lubrication Method Selection Calculator helps improve bearing performance, reduce friction and wear, extend service life, and ensure reliable operation of industrial machinery.
Equivalent load over dynamic capacity. Used for grease re-lubrication interval and heavy-load oil preference.
| Method | Suitability | Notes for this duty |
|---|---|---|
| Grease Lubrication | – | |
| Oil Bath / Splash | – | |
| Forced Oil Circulation | – | |
| Oil-Air / Oil-Mist | – |
Radar axes are “higher is more favorable.” The recommended method is highlighted.
- dm = (d + D) / 2 mm. Speed factor dn = n · dm mm·RPM. Roller types use a reduced speed scale versus deep-groove ball bearings.
- Required viscosity ν1 = 45 000 · n−0.83 · dm−0.5 cSt (SKF-style). Viscosity ratio κ = ν / ν1.
- Operating viscosity from ν40 uses the Ubbelohde–Walther equation with ν100 estimated from viscosity index (mineral VI 95 or synthetic VI 140).
- Selection map: dn < 300 000 grease; 300 000–500 000 high-speed grease or oil bath; 500 000–800 000 forced oil circulation; > 800 000 oil-air / oil-mist. High temperature or heavy load can shift the recommendation toward oil.
- Grease interval tf ≈ K · (1.4×106 /(n √dm) − 4 dm) hours, then temperature (halved every 15 °C above 70 °C) and load (C/P) factors. Cap 40 000 h. Not a substitute for OEM greasing charts.
- Screening tool only. Confirm limiting speed, grease speed factor, oil flow, heat exchanger duty and sealing with the bearing manufacturer catalog.
