31309 J2/QCL7CDF SKF Two SKF taper roller, face-to-face mounting

SKF Tapered roller bearings have tapered inner and outer ring raceways and tapered rollers. They are designed to accommodate combined loads, i.e. simultaneously acting radial and axial loads. The geometry and surface finish of the roller ends and the area on the flange that makes contact with the roller ends have been optimized to promote and maintain the formation of a lubricant film. This reduces friction and frictional heat as well as flange wear. The bearings can better maintain preload and run at reduced noise levels. The rollers used in SKF tapered roller bearings are made to such close tolerances that they are virtually identical. These extremely close tolerances, together with the precision of the raceway profiles, provide optimal load distribution over the rollers to reduce noise and vibration levels and enable preload to be set more accurately. Bearings identified by the designation suffix QCL7C were originally designed for use as pinion bearings in the differential of industrial transmissions to provide a constant, accurate gear mesh. The bearings are characterized by their tight geometrical tolerances and high preload capability. They have special friction characteristics and can be axially adjusted within narrow limits using the friction-torque method. Their internal design promotes the formation of a hydrodynamic oil film to substantially reduce friction and consequently operating temperature during the running-in period. When mounted, lubricated and maintained properly, bearings with a designation suffix QCL7C retain their preload setting