Scanning for ideas: Special housing keeps bearings cool
The SONL oil-lubricated bearing housing from SKF USA Inc., Kulpsville, Pa. (skf.com), uses oil-bath cooling for operations in which bearing temperatures might otherwise exceed 180˚F.
Oil in the reservoir is below the
bearing, eliminating heat from the bearing
churning through the oil. For more
cooling, optional single or dual tubes,
each operating independently, send water
into and out of the housing. Tests show
that one tube using 59F water reduces
bearing and oil temperature by 12 and
32F, respectively. Two cooling tubes
reduces them by 16 and 38F.
The design uses fewer parts than the
company’s last bearing housing.
For example, the previous
housing needed up to 20 bolts
on end covers. The new design
has no end covers. Fewer
parts reduces the risk of oil
leakage. Labyrinth seals prevent
contaminants from entering the
bearing and are built to retain oil, feeding
it back into the cast-iron housing. It can
be adapter or directly mounted