Tunnel Boring Machine Bearing

Tunnel Boring Machine Bearing – Heavy-Duty Slewing Solutions for Shield Equipment

Luoyang Hengguan Bearing Technology specializes in manufacturing tunnel boring machine bearing assemblies designed for extreme underground excavation conditions. Our Slewing Bearings feature double-row or multi-row ball structures with a diameter range from φ1200mm to φ6000mm and cross-section heights ranging from 150mm to 600mm. Made of 42CrMo alloy steel with raceway surface hardness reaching HRC55-60, these components support radial loads from 500kN to 8000kN and tilting moments up to 25000kN·m. With ISO9001 certification and over 20 years of bearing engineering expertise, we deliver custom solutions for Earth Pressure Balance shields, slurry TBMs, and hard rock boring machines operating in complex geological conditions worldwide.

Tunnel Boring Machine Bearing Details

Your excavation equipment requires reliable rotational connection that will not fail mid-project. Our Tunnel Boring Machine Bearing assemblies combine structural integrity with operational precision through multiple design features.

Structural Configuration

The one-piece steel construction eliminates weak points common in segmented designs. You get dual-row or multi-row ball arrangements that distribute loads evenly over the entire raceway circumference. This design avoids stress concentration under non-uniform loading conditions.

Integrated Gear Systems

We machine internal or external gear teeth directly into the bearing structure. Module options from M8 to M25 allow direct coupling with your drive system. This integration reduces part count and potential failure points in your drivetrain.

Sealing Technology

Special multi-stage seals prevent dirt ingress while maintaining grease retention. The system protects against abrasive particles in soil contact applications and handles pressure differentials in slurry shield operations.

Custom Mounting Patterns

Your machine’s bolt circle, mounting holes, and flange dimensions are machined to your exact specifications. This eliminates field modifications and ensures proper load transfer to the support structure.

Why Choose Us

Manufacturing Capacity

Our factory is equipped with CNC vertical machines, quenching machines, gear shapers, and precision grinding equipment. This complete production chain means we control quality at every manufacturing stage. You benefit from shorter lead times and consistent product performance.

Engineering Support

Our 50-member technical team includes engineers with professional expertise in slewing bearing applications. We provide selection assistance, 3D modeling based on your 2D drawings, and structural analysis for custom configurations.

Precision Grades

We manufacture to P0, P6, P5, and P4 precision classes. Your application determines the suitable grade—P0 for standard mechanical use, P4 for applications requiring minimal runout and vibration.

Global Experience

With products operating in over 50 countries, we understand varying standards and site conditions. Whether you are working with DIN specifications in Germany or ASTM requirements in North America, we adjust our manufacturing accordingly.

Customization Without Complexity

You can specify non-standard dimensions, special materials, or unique tooth profiles. Our team handles the engineering work, including legacy part mapping if you need to replace bearings from other manufacturers.

Technical Specifications

Testing & Certification

Every slewing bearing undergoes comprehensive quality testing using advanced equipment:

• Coordinate Measuring Machines verify dimensional accuracy
• Vibration Testing confirms smooth rotation characteristics
• Hardness Testing ensures proper heat treatment
• Gear Inspection validates slewing ring gear precision
• Life Testing validates durability under simulated operating conditions
• Material Certification provides full traceability

ISO 9001 certification and RoHS-compliant materials ensure your slewing ring meets international quality standards

Features and Benefits

High-Strength Alloy Construction

Using 42CrMo and 34CrNiMo6 steels gives you superior yield strength compared to standard carbon steels. You can push harder through difficult geology without worrying about structural deformation.

Induction-Hardened Raceways

Surface hardness of HRC55-60 provides exceptional wear resistance. The hardened layer extends bearing life in abrasive environments while the tough core absorbs impact loads from rock fragmentation.

Vacuum-Degassed Steel Option

For critical applications, we offer vacuum-degassed materials with reduced inclusions. This improves fatigue resistance and reduces the risk of subsurface cracking under cyclic loading.

Precision Grinding

All raceways undergo finishing to achieve specified tolerances. This ensures smooth rotation, reduces vibration transmission, and improves seal effectiveness by maintaining consistent gap geometry.

Load Distribution Design

Multi-row ball arrangements share loads across multiple contact points. This configuration handles combined axial, radial, and moment loading more effectively than single-row designs.

Full Traceability

Every bearing carries material certifications and process records. If you need documentation for project quality requirements, we provide complete manufacturing history.

Applications

Earth Pressure Balance Shields

In soft ground with high water content, your tunnel boring machine bearing must prevent muck intrusion while supporting cutterhead rotation. Our enhanced sealing systems maintain grease barriers even when operating in saturated conditions.

Slurry Shield TBMs

For sub-river crossings, the bearing operates in bentonite slurry under pressure. We design seal configurations that handle pressure differentials while maintaining rotational accuracy needed for face stability control.

Hard Rock Boring Machines

When excavating through granite or basalt, impact loads from disc cutter strikes transfer through the bearing. Our heat treatment process creates a microstructure that resists fatigue crack initiation from these repeated shocks.

Micro Shield Equipment

Smaller diameter projects for utility tunnels require compact bearing designs. We optimize cross-sectional dimensions while maintaining load capacity suitable for restricted-access applications.

Special Cross-Section Tunnels

Non-circular tunnels for metro stations or caverns need bearings that handle asymmetric loading. Our engineering team analyzes your load case and designs mounting configurations that prevent stress concentration.

Installation Guide

Pre-Installation Inspection

Check mounting surfaces for flatness within 0.2mm per meter. Remove paint, rust, or debris from bolt holes and contact faces. Verify bolt hole alignment with the bearing pattern.

Mounting Surface Preparation

Apply a thin layer of anti-seize compound to prevent corrosion between mating surfaces. Position alignment pins if your design includes them.

Bearing Positioning

Use lifting equipment rated for bearing weight. Position carefully to avoid damaging gear teeth. Align mounting holes before setting the bearing down completely.

Bolt Tightening Sequence

Tighten bolts in a star pattern, advancing through multiple passes. Use a calibrated torque wrench set to values specified in your project documentation. This prevents distortion of the bearing rings.

Gear Mesh Verification

After installation, check backlash at four points around the circumference. Adjust shimming if needed to achieve uniform values within tolerance.

Seal Inspection

Verify seal lip contact and grease pack integrity. Rotate the bearing manually through several revolutions to confirm smooth operation before connecting drive systems.

Exhibition

We attend many famous international exhibitions such as Shanghai International Maritime Exhibition,Mining World Russia, bauma China, CTT Russia, etc

Partners

Your trust, we cherish in heart all times and will reciprocate that trust with unwavering quality.

Packaging & shipping

Your goods are unique, and their journey should be flawless. Therefore, we offer professional and customized packaging services. Our experienced team will evaluate your goods' characteristics, transportation route, and environmental requirements to recommend the most secure solution, such as: wooden crate packaging, sturdy frame packaging, or composite reinforced packaging (wooden crate + iron frame).

Maintenance and Care

Lubrication Schedule

Inspect grease condition every 500 operating hours. Replace if contamination is visible or consistency changes. Use lithium-based greases rated for heavy load applications unless your specification requires alternatives.

Seal Monitoring

Check seals monthly for damage or grease leakage. In abrasive environments, inspect more frequently. Replace seals if you notice cracking or permanent deformation.

Bolt Tension Verification

Re-torque mounting bolts after the first 100 hours of operation, then quarterly. Vibration and load cycling can reduce preload over time.

Raceway Inspection

Every 2000 hours, inspect raceways using borescope equipment if access allows. Look for pitting, spalling, or discoloration indicating overheating. Early detection prevents catastrophic failure.

Gear Tooth Condition

Monitor tooth wear patterns. Uneven wear suggests misalignment that needs correction. Minor wear is normal, but if tooth profile changes significantly, consult with our engineering team about remaining service life.

Contamination Control

In muddy or sandy conditions, clean external surfaces weekly. Buildup around seals can work past barriers during operation. Use low-pressure water—avoid high-pressure washers that force contaminants into seals.

FAQ

Q: Can you manufacture bearings larger than φ6000mm?

A: Yes, our equipment handles diameters up to 10000mm. Contact our engineering team with your specifications for feasibility assessment.

Q: What lead time should we expect for custom designs?

A: Standard modifications take 8-10 weeks. Complex custom designs requiring new tooling may need 12-14 weeks. We'll provide a detailed schedule after reviewing your requirements.

Q: Do you supply bearings for retrofit projects?

A: Absolutely. Send us your existing bearing dimensions or provide access for our engineers to measure. We can reverse-engineer replacements that match your current mounting configuration.

Q: What documentation do you provide?

A: Each shipment includes material certificates, dimensional inspection reports, and heat treatment records. We can provide additional test data if your project specifications require it.

Q: Can bearings be repaired after wear?

A: Minor raceway damage can sometimes be restored through re-grinding and oversized ball replacement. Contact Us with photos and wear measurements for evaluation.

Q: How do you ensure quality for international projects?

A: We follow ISO9001 processes with coordinate measuring machine verification, vibration testing, and metallurgical analysis. Third-party inspection is available if your contract requires it.

Contact Us

Need technical specifications or a custom solution? Our engineering tunnel boring machine bearing's team is ready to assist with bearing selection and design optimization. Reach us at mia@hgb-bearing.com for project consultation.