An anti-friction rolling-element bearing that carries the radial and thrust loads of a traction or deflection sheave.
Full Definition
An elevator sheave bearing is the precision rolling-element bearing — typically a deep-groove ball bearing or a self-aligning spherical roller bearing — that supports the traction sheave or deflection sheave on its shaft, allowing it to rotate freely under the combined radial rope load and axial thrust load imposed by the roping geometry. In gearless traction machines the drive sheave is typically mounted directly on the motor shaft and uses the motor's own main bearings; in geared machines and for deflection sheaves a separate bearing housing carries tapered roller or deep-groove ball bearings. Bearing selection is based on the calculated rope resultant force (sum of loaded-side and empty-side rope tensions) and the required L10 bearing life, typically ≥ 50,000 hours for traction sheave bearings per ISO 281. Lubrication is grease-packed at installation; re-greasing intervals are specified by the machine manufacturer and typically range from 5,000 to 10,000 operating hours. Vibration monitoring via handheld accelerometer or permanently installed vibration sensors detects bearing defects — inner race, outer race, or rolling element fatigue — before total failure occurs. Abnormal bearing noise (rumbling, squealing) or heat exceeding 80 °C (as measured by infrared thermometer) requires immediate investigation and bearing replacement.
