Selecting the appropriate bearing clearance requires comprehensive consideration of factors such as bearing type, operating conditions, fit methods, and other multifaceted aspects to ensure the bearing achieves optimal performance during operation (long life, low heat generation, minimal vibration, stable accuracy).

  Core Influencing Factors

  Operating Conditions:

  1. Load Conditions‌

• Heavy-load scenarios: Select slightly larger clearance to avoid bearing contact stress concentration.

• Light-load high-precision applications: Opt for smaller clearance.

‌   2. Rotational Speed‌

• High-speed operation: Reserve greater clearance to compensate for thermal expansion (pronounced temperature rise during rotation).

• Low-speed heavy-load conditions: Choose smaller clearance to enhance rigidity.

 ‌   3. Temperature Environment‌

• High/low temperature extremes: Select larger clearance to counteract clearance reduction caused by differential thermal expansion between inner and outer rings.

• Fitting Methods:

• 1. Interference Fit for Inner Ring‌

• When the inner ring adopts an interference fit with the shaft, it induces ring expansion, reducing radial clearance. Compensation requires selecting a ‌larger initial clearance group‌ (e.g., C3/C4).

  ‌2. Interference Fit for Outer Ring‌
  An interference fit between the outer ring and housing causes ring contraction, similarly decreasing clearance. This necessitates ‌elevating the clearance grade‌.

  ‌3. Clearance Fit‌
  For clearance fits between rings and mating surfaces, standard clearance groups (e.g., CN/C0) may be applied without compensation adjustments.

• Bearing Types

• ‌    1. Self-Aligning Bearings & Cylindrical Roller Bearings‌
      Require larger clearance groups to accommodate self-alignment or compensate for deformation.

  ‌    2. Angular Contact Ball Bearings & Tapered Roller Bearings‌
      Typically require controlled clearance via ‌preload‌ to enhance rigidity.

   ‌   3. Deep Groove Ball Bearings‌
      Select clearance groups (CN/C2/C3) based on temperature and vibration requirements.

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