Many general greases cannot operate effectively at high speeds, as they can be ejected as equipment warms up. SPEL range of high-speed greases with low base oil viscosity and select thickeners have the ability to maintain desired film thickness even at high RPM’s.
High speed bearings operate under the hydro dynamic lubrication regime. The problem is that the viscosity of the base oil used in a multi service grease is typically 150 or 220 cSt at 40°C. For the same load (torque) on the bearing, as the rotational speed increases the viscosity should decrease. Lower base oil viscosity coupled with special thickener types offer the lowest internal friction that is necessary in such high-speed applications.
The speed value (DN) for inner ring rotation, is the product of the ball bearing’s bore in millimetres and shaft speed in rpm is the deciding factor for the rated base oil viscosity.
SPEL’s range of high-speed greases up to a D * N factor of 15,00,000 with low base oil viscosity and select thickeners have the ability to maintain desired film thickness even at high RPM’s.