SNFA Super Precision Angular Contact Bearings

Air-Oil Lubrication

High-speed operation requires efficient lubrication to ensure the presence of oil in the critical areas of the bearing, namely contact between raceway and rolling elements.

In these areas, because of high pressures and sliding effects, it is necessary to guarantee the separation of contacting surfaces by an oil film. The most traditional solution, the injection of the oil or of air-oil from nozzles, can result in lubricant dispersion due to the effects of wind at high rotational speeds (Fig.1).



The opportunity to run the air-oil flow directly into the bearing by means of radial holes in the outer rings becomes beneficial.  VEB and VEX bearings are predisposed for this solution, taking the "H1" (Fig.2) or "G1" (Fig.3) codes in their designation. The radial oil-feed holes and o-rings in the outer ring serve to:

• facilitate the design of oil supply circulation in the spindle body

• inject the lubricating flow directly at the high pressure points of contact

• keep the cage location lubricated

• minimize pressure losses of the air-oil flow.