INA ZARN1747-L-TV-A Nadel-Axialzylinderrollenlager (17x47x57)

As a combined needle/thrust bearing, this bearing carries radial and axial loads simultaneously. This INA bearing measures 17x47x57 mm and weighs 0.378 kg; the specification table carries the supplementary technical details. This combined version replaces two separate bearing positions and saves the installed length a series arrangement would take up.

The combined needle roller / axial cylindrical roller bearing unites two rolling element sets in one assembly: the needle roller assembly takes the radial load, the axially arranged cylindrical roller set the longitudinal force. Because both directions carry over rollers and therefore over line contact, the unit reaches a high capacity in both axes within a small envelope and replaces two individual bearings arranged in series.

The ratings apply separately: the radial rating describes the needle set, the axial one the roller set, and neither value supports the other direction. Depending on the version, supplied washers provide the raceways or the surrounding design does; in the latter case the mating faces are to be hardened, ground and made square to the axis. As with every axial roller set, sliding occurs along the roller length, so speed, lubricant supply and heat dissipation must be considered together. Standard bearing steel is through-hardened and covers the usual operating-temperature range.