Four row tapered roller bearings 3806/530

Four Row Tapered Roller Bearings 3806/530

Mounting Dimension

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Advantages of Four-Row Tapered Roller Bearings

Four-row tapered roller bearings are critical components in heavy industrial equipment, particularly in extreme-load applications such as rolling mills. Their core advantages include high load capacity, optimized rigidity, extended service life, and design simplification. Below is a detailed analysis:

1. Ultra-High Load Capacity

• Multi-row load distribution: Four rows of tapered rollers are arranged at precise angles to simultaneously handle combined radial and axial loads (e.g., rolling forces in steel mills), significantly outperforming single- or double-row bearings.

• Typical applications: Work rolls in hot/cold rolling mills, backup rolls, with axial loads reaching hundreds of tons and even higher radial loads.

2. Enhanced Rigidity and Stability

• Adjustable preload clearance: By adjusting the thickness of inner rings or spacer rings, bearing preload can be optimized to minimize elastic deformation during operation, ensuring high precision (e.g., ±0.01mm thickness control in rolled sheets).

• Impact resistance: The multi-row design disperses sudden shock loads (e.g., vibrations during material entry), protecting the spindle.

3. Extended Service Life and Easy Maintenance

• Optimized stress distribution: The four-row configuration reduces contact stress on individual rollers, extending fatigue life (L10 life can exceed tens of thousands of hours).

• Split design: Some models feature separable outer rings, allowing replacement without disassembling the entire roll (reducing downtime).

4. Space Efficiency and System Simplification

• Replaces multiple bearings: A single four-row bearing can substitute for multiple single-row bearings + thrust bearings, saving axial space (e.g., more compact mill housing designs).

• Integrated sealing options: Some models include built-in seals or lubrication grooves for harsh environments (e.g., high temperatures, dust).

5. Typical Applications

Comparison with Single/Double-Row Tapered Roller Bearings

Installation & Maintenance Tips

1. Clearance adjustment: Requires specialized tools to measure preload—excessive tightness causes overheating, while looseness reduces precision.

2. Lubrication requirements: High-temperature applications demand extreme-pressure grease or circulating oil (e.g., ISO VG 220 mill oil).

3. Failure warning: Vibration monitoring + temperature sensors prevent sudden failures (common failure mode: raceway spalling).

Selection Guidelines

• Choose four-row bearings when:

  • Rolling force > 500 tons or axial load > 200 tons.

  • Required material thickness tolerance < 0.05mm.

• Opt for single/double-row bearings in: Medium/small equipment or intermittent loads (e.g., straighteners).