GEARBOXES AND BEARINGS

Gearbox and bearings

Bearings and/or gearboxes fail for many reasons, but improper lubrication is at the top of the list, according to a variety of studies:

   Improper lubrication: 40 to 50 %

   Improper mounting: 25 to 30 %

   Other causes: approximately 20 %

   Reaching the natural fatigue limit: less than 10 %


Gearboxes and bearings must be lubricated to prevent metal-to-metal contact between the rolling elements, gears, raceways and retainers. In addition, lubrication protects the gearbox and bearings against corrosion and wear, helps dissipate heat, helps seal out solid and liquid contamination, and reduces noise. A properly lubricated bearing has the best chance of reaching its maximum service life.

There are numerous causes for lubricant failure, including:

   Insufficient lubricant quantity or viscosity

   Deterioration due to prolonged service without
   replenishment

   Excessive temperatures

   Contamination with foreign matter

   Use of grease when conditions dictate the use of static or
   circulating oil

   Incorrect grease base for a particular application

   Over-lubricating


Rolling element bearings depend on the continuous presence of a very thin – millionths of an inch – elastohydrodynamic film of lubricant between rolling elements and raceways, and between the cage, rings and rolling elements. Lubricant-related failures can be avoided by selecting a grease or oil that generates a sufficient film to keep bearing elements separated. A good lubricant also provides good boundary lubrication.
Lubricant failures can be detected by the presence of discolored (blue/brown) raceways and rolling elements. Excessive wear on rolling elements, rings and cages follows, resulting in overheating and subsequent catastrophic failure.
In addition, if a gearbox or bearing has insufficient lubrication, or if the lubricant has lost its lubricating properties, an oil film with sufficient load-carrying capacity cannot form. The result is metal-to-metal contact between rolling elements, gears and raceways, leading to adhesive wear.

The unique characteristics and properties of ENVIRO₂PRO assist you in minimizing adhesive wear, overheating and failure. The load-carrying capacity of the oil film will be restored.