Double-row slewing bearings are critical components in heavy machinery, designed to handle significant axial, radial, and moment loads while enabling rotational movement. Due to the demanding environments they operate in, they are susceptible to various faults. Understanding these common issues and their solutions is crucial for maintaining equipment performance and longevity.
Common Faults of Double-Row Slewing Bearings
Abnormal Noise (Clicking, Grinding, Squealing, or Rattling):
Causas:
Insufficient or Improper Lubrication: Lack of grease, deteriorated grease, or using the wrong type of lubricant.
Foreign Objects in Raceway: Polvo, suciedad, partículas metálicas, or other debris entering the bearing.
Severe Raceway or Rolling Element Wear: Pitting, Según la influencia del material del cojinete., or other damage due to fatigue, corrosión, o contaminación.
Loose Mounting Bolts: Allowing movement between the bearing and its mounting surface.
Poor Meshing of Gears: Improper clearance between the slewing bearing’s gear and the pinion, or damaged/broken teeth.
Bearing Overload: Exceeding the bearing’s design load capacity.
Internal Faults: Such as a damaged cage, inner/outer ring, or balls.
Symptoms: Loud, unusual sounds during rotation, especially under load.
Lack of Flexibility in Rotation (Stiffness, Slow Movement, or Jamming):
Causas:
Lubricación insuficiente: Grease becoming viscous, especially in cold weather, or simply not enough lubrication.
Foreign Objects in Raceway: Blocking the rolling elements.
Overload Operation: Causing damage to the raceway.
Instalación incorrecta: Uneven mounting surface, resulting in uneven force distribution or the bearing being in a negative clearance state.
Damaged Sealing Strips: Allowing foreign objects or moisture to enter.
Bearing Deformation: Due to excessive load or manufacturing defects.
Excessive Clearance: Leading to “movimiento salvaje” or looseness.
Symptoms: Difficulty in rotating the slewing platform, jerky movement, or complete inability to rotate.
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