Suitable for ceiling mounts in medical operating theatres, the Schaeffler Group’s ZAXB bearing unit incorporates an AXS angular contact roller bearing that supports high axial loads and tilting moments. It can also be used in examination tables, mammography devices, X-ray cameras, surgical microscopes and stair lifts. The integral electromechanical brake ensures secure location, once the desired position has been found. The unit is a closed system, meaning less exposure to aggressive cleaning chemicals. It comprises an outer ring with fixing thread, an inner ring with coil and pressure springs, an adjusting nut with fixing thread, an anchor plate with axial movement facility, and a lining plate that is connected to the outer ring. There are also two double direction axial angular contact roller bearings in an ‘O’ arrangement. As a result of this ‘O’ arrangement and the contact angle of 60º, the bearing unit provides high load-carrying capacity and exhibits significant radial stiffness. The bearing rings and adjusting nut are precision-turned parts made from high-strength steel, while the axial roller and cage assemblies and axial bearing washers are manufactured using non-machining methods. The integrated brake prevents the bearing unit from rotating when the current is turned off, as the anchor plate is pressed against the brake lining by springs. Therefore, the ceiling mount is safely fixed. When current is supplied, an electromagnet pulls the anchor plate against the springs and releases the brake lining so that the unit can rotate and be brought smoothly into another position.
Edited by: Teoman Tugsuz
