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Koyo Technical Information

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1. Types of rolling bearings and characteristics
   • Angular contact ball bearings
   • Outline of bearing selection
2. Bearing arrangements
   • Arrangement in which fixed and free sides are distinguished
   • Arrangement in which fixed and free sides are not distinguished
   • Application to vertical shafts
   • Gear transmission two-point-support system
3. Bearing service life and selection
   • Basic dynamic load rating
   • Selection based on service life
   • Basic static load rating and safety coefficient
4. Tolerances for bearings
   • Tolerances
5. Limiting speed
   • Limiting speed of bearings
   • Correction of limiting speed
   • Consideration for high speed
   • Friction coefficient of bearings
   • Passing vibration frequency
6. Fits
   • Purpose and selection
   • Load characteristics
   • Load magnitude
   • Surface roughness
   • Temperature
   • Maximum stress of bearing
7. Internal clearance
   • Internal clearance of bearing
   • Operating clearance
   • Clearance specifications
   • Recommended internal clearance
8. Preload
   • Purpose and method of preload
   • Amount of preload — Matched pair angular contact ball bearings
     • b.1. S: slight preload
     • b.2. L: light preload
     • b.3. M: medium preload
     • b.4. H: heavy preload
9. Lubrication
   • Grease lubrication
   • Oil lubrication
     • b.1. Lubricating oil
     • b.2. Kinematic viscosity
     • b.3. Lubrication methods
10. Materials
    • Outer/Inner ring and rolling element materials
      • a.1. High carbon chromium bearing steel
      • a.2. Case hardened steel
      • a.3. Other materials
    • Materials used for cages
11. Handling of bearings
    • General instructions
      • a.1. Mounting methods
      • a.2. Press fit of bearings with cylindrical bore bearings
      • a.3. Shrink fit of bearings with cylindrical bore bearings
    • Test run
    • Maintenance and checking
    • Checking of bearings
12. Bearing failures and countermeasures
    • Flaking
    • Cracking, Chipping
    • Brinelling, Nicks
    • Pear skin, Discoloration
    • Scratch, Scuffing
    • Smearing
    • Rust, Corrosion
    • Electric pitting
    • Wear
    • Fretting
    • Creeping
    • Damage to Retainer
    • Seizure