352226X2-2RZ 197726 Railway train bearings
352226X2-2RZ Product Introduction
The 352226X2-2RZ is a dedicated double-row tapered roller bearing independently developed for speed-up and heavy-duty transformation of domestic railway freight wagons, also known under the former designation 197726K2. Differing from traditional open railway bearings, this unit adopts an integrated double outer ring structure with built-in precision oil grooves at the raceway root, paired with dual-side 2RZ non-contact rubber sealing structures, achieving a perfect balance of high running speed, reliable sealing and low operating friction.
Manufactured from fully hardened high-carbon chromium bearing steel, the bearing undergoes strict overall quenching and ultra-precision raceway superfinishing processes. Its optimized roller contact geometry effectively disperses alternating stress generated by track vibration and frequent impact loads during vehicle operation, delivering exceptional structural stability and long contact fatigue life. The internal circulation oil groove design maintains continuous and uniform grease lubrication under long-distance continuous running, effectively suppressing temperature rise and avoiding dry friction abrasion, adapting to all-weather outdoor railway operation environments.
With compact integrated structure and high assembly precision, this bearing features outstanding radial and axial combined load capacity. The upgraded double-sided sealing system efficiently isolates dust, moisture and fine track impurities, greatly reducing internal contamination and wear. It is a core standardized component for modern speed-increased freight bogie axle box systems, significantly lowering equipment maintenance frequency and extending the overall service life of wheelset assemblies.
Technical Specifications
Inner Diameter: 130 mm
Outer Diameter: 230 mm
Overall Width: 150 mm
Bearing Weight: 27.6 kg
Product Characteristics
1. Professional railway-specific sealing design provides excellent dustproof and moisture-proof performance, realizing long-term stable operation in complex and harsh track environments;
2. Integrated double outer ring structure eliminates assembly gaps, ensures high-precision rotation of wheelsets, and improves the smoothness and safety of freight vehicle operation;
3. Reasonable internal lubrication structure reduces operating friction and heat accumulation, adapting to long-cycle and high-frequency continuous running working conditions;
4. High-strength steel material and mature heat treatment process endow superior impact resistance and fatigue durability, fully matching the speed and load requirements of upgraded railway freight transportation.
Application
Mainly applied to axle box and wheelset support systems of speed-increased and heavy-duty railway freight wagons. It is widely used in medium and heavy-load railway freight lines, serving as a key reliable load-bearing and protective component for modern freight rolling stock bogie systems.
