Hybrid Bearings

Features and Benefits

Compared to bearings with steel rolling elements of the same size, the benefits of hybrid bearings include:

• Protection against electrical discharge damage
  Hybrid bearings are non-conductive, making them suitable for applications where electrical currents are present, such as AC and DC motors and generators.
• Higher speed capability
  The density of the silicon nitride rolling element is 60% lower than that of a rolling element made of bearing steel of the same size. The lower weight and inertia translate into higher speed capability and superior performance in quick start-stop operations.
• Longer service life
  Hybrid bearings generate less frictional heat, especially at high speeds, extending bearing life and increasing relubrication intervals.
• High wear resistance
  Silicon nitride rolling elements have a higher hardness, making hybrid bearings suitable for demanding conditions and contaminated environments.
• High bearing stiffness
  With a high modulus of elasticity, hybrid bearings offer increased bearing stiffness.
• Reduced risk of smearing
  Even under poor lubrication conditions, such as at high speeds and accelerations, or with inadequate hydrodynamic film, the risk of smearing between the silicon nitride and steel surfaces is reduced.
• Reduced risk of false brinelling
  When exposed to vibration, hybrid bearings are significantly less sensitive to the risk of false brinelling (shallow depressions in raceways) between the silicon nitride and steel surfaces.
• Less sensitivity to temperature gradients
  Silicon nitride rolling elements have a lower thermal expansion coefficient, making them more stable against temperature gradients within the bearing and enabling more accurate preload/clearance control.