Tapered roller should be designed so that the contact line between the roller and the inner and outer raceway is extended to the same point on the bearing axis to achieve pure rolling.
New design of tapered roller bearings with reinforced structure, roller diameter increases, the length of the roller longer, the number of rollers increased, with convex roller, the bearing capacity and fatigue life significantly improved. Roller large end face and the big wall with the use of spherical and cone contact, improved lubrication.
The type of roller bearings according to the number of columns can be divided into single row, double row and four rows of tapered roller bearings and other different structural types. These bearings also use the British series of products. get here http://www.szr-bearing.com/product.asp