Features of Needle roller bearings

Features Of Needle Roller Bearings:

• In fact, needle bearings are cylindrical roller bearings with long slim rollers (acc. to ISO, the roller length is min. 2.5 diameter)
• Show small installation height, high accuracy and rigidity
• Despite their low cross section, the bearings have a high load rating and are therefore very suitable for seating where radial dimensions are limited
• Used, above all, for low speeds or swinging movements; also suitable for fluctuating and surge loads
• Cannot retain any axial forces, however, allow axial misalignment of the rings
• One or both rings may be omitted to reduce the installation height; however, seating surfaces on the shaft must then be hardened and machined carefully
• Show high requirements for alignment of the journal and bearing body, the maximum permissible tilting angle is 3-4'
• Delivered also with seals

Features of Taper roller bearings

Features of Taper roller bearings:

• Designed usually as dismountable, provided with tapered orbital paths on the outer and inner rings with tapered rollers arranged in the paths
• High load rating; suitable especially for retaining simultaneously acting large radial and axial forces
• Allow the retention of axial forces in one direction only; therefore installed in pairs in opposite positions and as close to each other as possible
• In case of too high loading on the bearing or if axial forces must be retained in both directions, the bearings can be paired (pairs of bearings are delivered in one packing; as the bearings are paired, bearings from different pairs must not be used together)
• Higher load rating than angular contact ball bearings, however, these types are designed for lower speeds
• Seating surfaces for tapered roller bearings must be aligned; the permissible tilting angle is 2-4'