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

Product Specification

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:

I. Technical Parameters

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.

II. Application Scenarios

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 .

III. Installation & 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 .

IV. Standards & Certifications

• 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 .

V. Key Considerations

• 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.