INA crossed roller bearings mainly refer to the SX series cross roller ring. Though XA/XI/XU slewing ring and XSA/XSI/XSU series slewing bearings rolling elements are all arranged as crossed roller bearing, we perfer to call them "crossed roller slewing bearing". (Check the differences between crossed roller bearings and crossed roller slewing bearings)
Crossed roller bearings become more and more popular these years, because they have many advantages compared to common type bearings.The arrangesments of rolling elements
The rolling elements of common bearings are either steel balls or rollers. The rolling elements of ball bearings are in point contact with bearings raceway, while that of roller bearings are in line contact with bearings raceway.
Compared with ball bearings, SX crossed roller bearings cylindrical rollers are placed on the V shape groove. So they are in line contact with raceway, and have higher load carrying capacity.
Compared with common type roller bearings, INA SX crossed roller bearing rolling elements are in an "X" arrangement with each other on the raceway. So they can support loads from multiple directions, while common roller bearings can only withstand loads from radial direction. Therefore, one SX cross roller bearing can replace two common bearings.
Below table showed the running accuracy of INA SX crossed roller bearings.
|Model||Inner dia. (mm)||Radial runout tolerance of inner ring||Axial runout tolerance of inner ring|