Utilizing technologies exclusive to NSK, reconditionable large tapered bearings deliver three key features: long service life (high load capacity) for long-term use, a separable structure that allows for detailed examinations of bearing internals, and a staked-bolt design that prevents parts from loosening in environments with vibration. This combination of solutions built on NSK Core Technologies provides an industry-first in reconditionable large TRBs.

1. 　Long Life (High Load Capacity) for Long-Term Use 　

   Highly accurate bearing life prediction through

   NSK’s Micro-UT testing delivers a high load capacity design and up to 2x longer bearing life.

2.Separable Structure for In-Depth Inspections     

 In tapered roller bearings, the rollers are guided by rims on the inner ring referred to as the large rib and small rib. In conventional bearings, only the outer ring can be separated easily, but new reconditionable TRBs address this issue with a separable small rib held in place by removeable bolts. With this configuration, the rollers, cage, and inner ring can all be separated, allowing detailed inspections for all parts.

3.　Anti-Vibration Staked-Bolt Design 　

Mining applications are characterized by vibration, which can cause the fasteners for separable parts to become loose or even fall out. The bolts used to hold the separable inner rib of the bearing in place are secured by staked bolt holes to prevent dislocation, helping to further improve reliability in operating environments with vibration.

Product Benefits 　

Reconditionable large tapered roller bearings help reduce maintenance costs and cut CO₂ emissions in key equipment in the mining industry. 

 1)  Maintenance Cost Savings (Example) (From first use of bearing use to second equipment maintenance when bearing is scrapped) 

 Reconditionable bearings can be repaired and reused, reducing the number of replacements required during equipment maintenance. 

 Number of bearings replaced per dump truck: 8 ⇒ 4 

 Number of bearings replaced per crusher:       12 ⇒ 6 

 2)  Reduction of CO2 Emissions (Example) 

 (From first use of bearing use to second equipment maintenance when bearing is scrapped) 　

Using reconditionable bearings in the wheels of dump trucks wheels could lead to a 3,102 kg-CO2 reduction across the equipment’s carbon footprint.8 　

These bearings also serve as a key product and functional example of NSK’s efforts to establish and expand PLM9 models with reconditioning as a core component.