Cookies en el sitio web de SKF

Utilizamos cookies para garantizar que le brindamos la mejor experiencia posible en nuestros sitios y aplicaciones web. Si continúa navegando sin cambiar la configuración de su navegador, supondremos que acepta recibir cookies. No obstante, puede cambiar la configuración de cookies de su navegador en cualquier momento.

Kinematic replenishment/starvation reduction factor

For oil-air, oil jet, low level oil bath lubrication (i.e. oil level H lower than the centre of the lowest rolling element) and grease lubrication methods, continuous over-rolling displaces excess lubricant from the raceways. In applications where viscosity or speeds are high, the lubricant may not have sufficient time to replenish the raceways, causing a "kinematic starvation" effect. Kinematic starvation reduces the thickness of the hydrodynamic film (decreasing κ value, refer to Viscosity ratio κ) and rolling friction.
For the type of lubrication methods described above, the kinematic replenishment/starvation reduction factor can be estimated using

Φrs Kinematic replensihment-starvation reduction factor

where
φrs =kinematic replenishment/starvation reduction factor
e=

base of natural logarithm 

 2,718

Krs =

replenishment/starvation constant: 

= 3 x 10-8 for low level oil bath and oil jet lubrication 

= 6 x 10-8 for grease and oil-air lubrication

Kz =bearing type related geometric constant (table 1)
ν =kinematic viscosity at operating temperature of the oil or the base oil viscosity of the grease [mm2/s]
=rotational speed [r/min]
=bearing bore diameter [mm]
=bearing outside diameter [mm]
SKF logo