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Lubricating Oil

The lubricating oils used for rolling bearings are usually highly refined mineral oil or synthetic oil that have a high oil film strength and superior oxidation and corrosion resistance.

 When selecting a lubricating oil, the viscosity at the operating conditions is important. If the viscosity is too low, a proper oil film is not formed and abnormal wear and seizure may occur. On the other hand, if the viscosity is too high, excessive viscous resistance may cause heating or large power loss.

  In general, low viscosity oils should be used at high speed; however, the viscosity should increase with increasing bearing load and size.

Oil Replacement Intervals
 Oil replacement intervals depend on the operating conditions and oil quantity.In those cases where the operating temperature is less than 50˚C, and the environmental conditions are good with little dust, the oil should be replaced approximately once a year. However, in cases where the oil temperature is about 100˚C, the oil must be changed at least once every three months.

 If moisture may enter or if foreign matter may be mixed in the oil, then the oil replacement interval must be shortened.
 Mixing different brands of oil must be prevented for the same reason given previously for grease. 

 The lubricating oils used for rolling bearings are usually highly refined mineral oil or synthetic oil that have a high oil film strength and superior oxidation and corrosion resistance.
 When selecting a lubricating oil, the viscosity at the operating conditions is important. If the viscosity is too low, a proper oil film is not formed and abnormal wear and seizure may occur. On the other hand, if the viscosity is too high, excessive viscous resistance may cause heating or large power loss.
  In general, low viscosity oils should be used at high speed; however, the viscosity should increase with increasing bearing load and size.

Oil Replacement Intervals
 Oil replacement intervals depend on the operating conditions and oil quantity.In those cases where the operating temperature is less than 50˚C, and the environmental conditions are good with little dust, the oil should be replaced approximately once a year. However, in cases where the oil temperature is about 100˚C, the oil must be changed at least once every three months.
 If moisture may enter or if foreign matter may be mixed in the oil, then the oil replacement interval must be shortened.
 Mixing different brands of oil must be prevented for the same reason given previously for grease.