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HM136948/HM136916XD G7X12/G7X14 Railway train bearings
The HM136948 / HM136916XD is a high-precision imperial TDO double-row tapered roller bearing, specially engineered for heavy-haul railway wheel set fixed-end applications. Marked by a unique non-standard shoulder structure, this bearing boasts customized dimensional design that differentiates it from conventional railway bearings, requiring precise matching with mating components to deliver optimal assembly accuracy and load transmission efficiency. The assembly consists of two independent HM136948 inner cones and a rigid one-piece HM136916XD double outer cup, paired with a precision internal spacer to stabilize axial clearance and enhance overall structural integrity during dynamic operation.
Crafted from premium vacuum-degassed bearing steel and processed through rigorous heat treatment and ultra-precision raceway grinding, this bearing achieves exceptional hardness, structural toughness and anti-fatigue performance. Its refined roller-to-raceway contact profile effectively disperses extreme alternating radial and axial stresses generated by heavy load impacts and frequent track vibration. This structural optimization minimizes local stress concentration and friction loss, enabling stable, long-term operation under harsh all-weather railway working conditions with outstanding wear resistance and operational durability.
Classified as a 7×12 inch heavy-duty railway bearing with equivalent model BT2-8609BB and TAROL7×12-U-JP, this unit features enlarged load-bearing areas and upgraded structural rigidity. It delivers superior comprehensive load capacity and anti-overturning stability, perfectly adapting to high-tonnage freight railway transportation demands. As a core safety component for heavy-haul rail vehicle wheel set systems, it effectively stabilizes wheel set rotation accuracy and extends the service cycle of bogie assemblies.
Technical Specifications
Inner Diameter (d): 177.787 mm
Outer Diameter (D): 276.225 mm
Assembled Total Width (T): 185.725 mm
Inner Cone Width (B): 74.613 mm
Bearing Weight: 39.20 kg
1. Exclusive non-standard shoulder structure realizes ultra-high assembly fitting precision, eliminating running deviation and ensuring consistent wheel set operational stability under extreme heavy loads;
2. Robust integral double outer cup structure enhances overall rigidity, effectively resists structural deformation and vibration fatigue in long-term heavy-haul operation;
3. Optimized internal contact geometry reduces friction heat accumulation, maintaining stable lubrication state and lowering failure risks during long-cycle continuous running;
4. Premium material craftsmanship endows excellent impact resistance and fatigue durability, fully compliant with stringent heavy-haul railway load and safety standards.
Application Scope
Primarily utilized for fixed-end wheel set bearing systems of large-tonnage heavy-haul railway freight wagons. It is applicable to high-load, high-vibration and long-service-cycle rail transit scenarios, serving as a critical load-bearing and safety guarantee component for modern heavy-duty railway bogie systems.
