Heavy-duty Freight Train Bearings Size 157*250*181mm Taper Roller Bearings BT2-8606 For Railway Bearing

Seal designs 

Garter seal As mentioned earlier, the first tapered roller  bearing units were designed to replace plain  bearings. These inch size TBU designs had  to match the existing relatively long journal  dimension. This design enables the  integration of a seal wear ring on both sides  where the garter seals are riding. AAR has standardized these garter seals  and seal wear rings, which are  interchangeable with components from  different bearing manufacturers. Today, SKF  offers special LL seal designs for inch size  TBUs that generate much lower friction. LL seal The LL (labyrinth-lip) seal design is based  on a low-friction rubber seal principle that is  applied to TBU and CTBU designs. The main  features are a combination of labyrinth, lip  and flinger elements and improved  protection against contaminants to extend  bearing service life. The frictional moment  can be reduced by up to 75%, compared to a  garter seal arrangement. As a consequence,  the bearing operating temperature is  reduced by 20 °C, which contributes to  longer grease life and energy savings.  Results from the SKF seal test, which  evaluates water and dust exclusion,  confirmed that the design is very effective in  excluding contaminants. Long-term  endurance tests have successfully been  conducted under very severe operating  conditions. 

Railway bearings are applied to railways, axle bearings. The axle systems of railway locomotives and vehicles adopt different structural designs due to different application conditions. Locomotives and passenger cars have axle boxes, and the bearings are connected to the bogie through the axle boxes.

According to the application requirements of railway bearings, wheel bearings should have a long maintenance-free period, a maintenance-friendly structural design and high reliability.