Roller Bearing Inner Ring Cooling for Axial Temperature Homogeneity

The invention applies local quality by introducing through-holes specifically in the first axial end annular portion (the hotter portion) of the inner ring, while leaving the second axial end annular portion without through-holes. This localized modification allows differential thermal cooling where it is most needed, reducing the thermal gradient across the inner ring without requiring complex modifications to the entire bearing structure. The selective placement of cooling features in the hottest region resolves the contradiction by providing targeted reliability improvement without proportionate increases in device complexity.

The invention applies preliminary action by implementing through-holes and oil circulation paths in advance within the inner ring structure, before thermal expansion occurs during operation. The cooling system proactively removes heat from the hottest axial portions, preventing excessive thermal expansion before it can compromise the reduced internal clearances. This preventive thermal management allows the bearing to maintain smaller, more efficient clearances while preserving reliability through advance thermal control.

The invention resolves this contradiction by applying local quality through asymmetric placement of through-holes in the inner ring. The through-holes are concentrated in the first axial end annular portion that is more exposed to heat, while the second axial end annular portion remains without through-holes or has fewer of them. This non-uniform distribution of cooling features matches the asymmetric thermal exposure, providing optimal temperature control without requiring complex multi-zone cooling systems. The manufacturing complexity remains low because the through-holes can be created using standard drilling or machining processes, while the temperature distribution is significantly improved by targeting the hottest regions.