Double Row Tapered Roller Bearing 33018 High Load For Heavy Industry Transportation

Tapered roller bearing 33018 is a double-row separable bearing designed for high radial and bidirectional axial combined loads, widely used in heavy industrial equipment and precision machinery. Here is a detailed breakdown of its core specifications and applications:

1. Basic Dimensions
   • Bore: 90 mm
   • Outer diameter: 140 mm
   • Total width: 39 mm
   • Contact angle: 10°10'
   • Weight: 2.2–2.48 kg
2. Load Capacity
   • Dynamic load rating: 216–369 kN (varies with design optimizations)
   • Static load rating: 360–365 kN
   • Limiting speed: 4,500–4,800 r/min (dependent on lubrication and material)
   • Reference speed: 2,600–2,800 r/min
3. Structural Advantages
   • Double-row tapered rollers: Achieve high rigidity through line contact between rollers and raceways.
   • Separable design: Allows independent installation of inner and outer rings, facilitating clearance adjustment and maintenance .
   • Optimized contact angle (10°10'): Balances radial and axial load capabilities.

1. Heavy Industrial Machinery
   • Mining crushers and ball mills: Handles high radial forces from grinding media.
   • Rolling mills and large reducers: Stabilizes cyclic impact loads in industrial processing .
2. Transportation Equipment
   • Heavy-duty truck axles and railway bogies: Supports dynamic loads during high-speed operation.
   • Construction machinery: Used in excavator slewing rings and loader gearboxes for bidirectional positioning .
3. Precision Machinery
   • Machine tool spindles and printing rollers: Ensures machining accuracy with low friction and high rigidity.
   • Wind turbine gearboxes: Maintains stability in high-temperature, dusty environments .
4. New Energy and Environmental Equipment
   • Biomass compressors: Withstands harsh conditions and enables long-term operation.
   • Separable design: Reduces downtime by simplifying maintenance .

1. Installation Methods
   • Interference fit:
     • Heat inner ring to 80–100°C for thermal mounting.
     • Use precision spacers to avoid raceway damage during press-fitting .
   • Preload adjustment:
     • Pair bearings with spacers or nuts to control axial clearance (0.03–0.08 mm for double-row bearings) .
2. Lubrication Recommendations
   • Grease lubrication:
     • Fill 1/3 of internal space with lithium-based grease (NLGI 2), suitable for -30°C to 150°C.
     • Re-lubricate every 200 hours in high-temperature environments .
   • Oil lubrication:
     • Flow rate: 30–40 mL/min for high-speed applications to ensure cooling .
3. Maintenance Checks
   • Monitor vibration and temperature: Shut down if temperature exceeds ambient by 40°C or vibration exceeds ISO 10816 standards.
   • Use hydraulic pullers or induction heaters for disassembly to prevent damage .

• Compliant with DIN ISO 355 and DIN 720 international standards.
• Aligned with GB/T 297-2015 (China) for dimensional tolerances and interchangeability.
• Optional versions meet API 610 for petrochemical applications .

• Material selection: High-carbon chromium steel (GCr15) or ceramic hybrid materials for extreme conditions.
• Customization: Available options include special coatings and clearance classes to optimize performance for specific loads and speeds .

Conclusion: The 33018 tapered roller bearing excels in heavy-duty applications requiring robust radial and axial support. Its separable design, high rigidity, and compliance with global standards make it a versatile choice for industries ranging from mining to renewable energy. Always match lubrication and installation practices to operational requirements for optimal longevity.