What is the function of main engine bearings?

What is the function of main engine bearings?

• A. Absorb radial loads only
• B. Used in high centrifugal force areas
• C. Support the compressor and turbine rotors and allow them to rotate freely
• D. Absorb loads created by drive shafts and gears

Answer: (C)

Main engine bearings provide radial support for the rotating core of the engine—the compressor and turbine rotors—keeping them properly aligned in the bearing housings and allowing them to spin smoothly with minimal friction. They sustain the radial loads produced by the spinning assembly and rely on a film of oil to separate the surfaces, reducing wear and heat. Axial (thrust) loads are handled by thrust bearings, not these main bearings, and loads from drive shafts and gears are managed by bearings in the gearbox, not the main engine bearings. So the essential function is to support the rotors and permit free, efficient rotation.

Main engine bearings provide radial support for the rotating core of the engine—the compressor and turbine rotors—keeping them properly aligned in the bearing housings and allowing them to spin smoothly with minimal friction. They sustain the radial loads produced by the spinning assembly and rely on a film of oil to separate the surfaces, reducing wear and heat. Axial (thrust) loads are handled by thrust bearings, not these main bearings, and loads from drive shafts and gears are managed by bearings in the gearbox, not the main engine bearings. So the essential function is to support the rotors and permit free, efficient rotation.