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References: Bearings, Shafts and Shaft Seals

  1. Spherical roller bearing - Wikipedia - Describes barrel-shaped rollers in a spherical outer raceway, their high load capacity and tolerance of misalignment. Background for why heavy industrial fans use spherical roller pillow blocks.

  2. Radial shaft seal - Wikipedia - Explains rotary lip seals: an elastomer lip pressed against a turning shaft, common materials and failure modes. Supports the chapter's lip shaft seal and bearing lip seal descriptions.

  3. Stuffing box - Wikipedia - Covers the gland assembly that houses packing compressed around a rotating or sliding shaft to limit leakage. The same principle behind the chapter's Graphoil stuffing box seal and its retightenable packing.

  4. Shigley's Mechanical Engineering Design (11th ed.) - Richard G. Budynas and J. Keith Nisbett - McGraw-Hill - Known for its step-by-step rolling-bearing selection method linking catalog load rating, L-10 rating life and reliability, plus clear treatment of keys, setscrews and collars on shafts.

  5. Seals and Sealing Handbook (6th ed.) - Robert K. Flitney - Butterworth-Heinemann - Flitney's handbook is valued for comparing rotary lip seals, compression packings, mechanical seals and clearance seals side by side, which mirrors the chapter's contact, carbon ring and stuffing box families.

  6. FanPedia: The Fan & Blower Encyclopedia (PDF) - Twin City Fan - The chapter's primary source: shaft features, bearing types and mounts, fixed and floating bearings, bearing seals and sensors, and the shaft seal pages with exploded views.

  7. FanPedia online - Twin City Fan - Web edition of FanPedia with the Fan Components bearing and shaft image galleries and the Accessories pages, useful for quick visual lookup of the parts named in this chapter.

  8. Fan Bearing Selection (FE-1200) - Twin City Fan Engineering Letter - The letter FanPedia cites for bearing seals: bearing construction, lip, labyrinth and taconite seals, L-10 life, and fixed and expansion bearing practice.

  9. Sealing of Fan Housings (FE-700) - Twin City Fan Engineering Letter - Explains why housing leakage matters (energy, hazards, bearing damage, noise) and compares shaft seal types and degrees of sealing, expanding the chapter's shaft seal section.

  10. VFD Induced AC Motor Shaft Current and Bearing Damage (FE-4000) - Twin City Fan Engineering Letter - Shows how drive-induced shaft voltage pits bearing raceways and how insulated bearings and grounding mitigate it, the problem behind the chapter's insulated bearing.