The design of rolling bearing mountings by Fag Bearing Company Ltd

By Fag Bearing Company Ltd

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UL and accommodates the cutting forces transmitted by the four cutting tools. 5 kN (2 % of C0/Y0) by means of springs. UL in O arrangement accommodate the guiding loads from the axially displaceable hollow cone in which the four tool carriages are radially guided and adjusted. These bearings are also adjusted against each other with a spring preload of 5 kN (1 % of C0/Y0). Experience shows that with these preloads no slippage damage results, even if the rough-turning lathe is slowed down from 3,600 min–1 to zero within a second.

The driving torque is transmitted by sleeve M via balls to the bevelled disk hub H. The ball contact surfaces of coupling K are wedge-shaped. Thus, sleeve and bevelled disk hub are separated depending on the torque transmitted, and subsequently the contact pressure between chain and disks is adapted to the torque. P5 accommodate the axial loads resulting from the contact pressure. Torque variations are associated with small relative movements between shaft and drive disks; for this reason the two parts are separated by needle roller and cage assemblies (dimensions 37 x 45 x 26 mm).

As a result, the bearings always operate in the mixed-friction range and are exposed to the risk of increased wear. This condition requires particularly suitable and tested lubricating oils. A central circulation lubrication system with recooling supplies all bearings with oil. Holes in the bearing housings, circumferential grooves in the bearing outer rings and in the spacers as well as radial grooves in the outer faces feed the oil directly into the bearings. Lip seals in the housing covers prevent dirt particles from penetrating into the bearings.

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