Main bearing is a critical rotating component in tunnel boring machines that supports the cutterhead and transmits thrust loads.
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Diameter | 3,000-8,000 mm | |
| Mounting | Hydraulic shrink-fit or heated mounting | |
| Lubrication | Forced oil circulation with filtration | |
| Service Life | 10,000-15,000 hours | |
| Load Capacity | 5,000-15,000 kN axial, 2,000-6,000 kN radial | |
| Rotation Speed | 0-10 RPM | |
| Precision Class | P5 or higher (ISO 492) |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
This component is used in the following industrial products
A large mechanized excavation system used to bore tunnels through various ground conditions.
A mechanized tunneling system used for excavating tunnels through various ground conditions while providing immediate structural support.
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Properly maintained TBM main bearings typically achieve 10,000-15,000 operational hours, equivalent to 10-15 kilometers of tunnel excavation, depending on ground conditions and loading patterns.
Main bearings use forced oil circulation systems with dual filtration (typically 10-25 micron filters), temperature monitoring, and sometimes grease backup systems. The oil serves both as lubricant and coolant.
Common causes include contaminated lubrication (80% of failures), improper mounting/preload, shock loads from hard rock formations, seal failure allowing abrasive ingress, and misalignment exceeding 0.1mm/m.
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