Special ball bearing

Special ball bearings

All Nanotec stepper motors and BLDC motors of the ST.. and DB.. series are equipped with double bearings (with lifetime lubrication and a service temperature of -40°C - + 130°C at low coefficients of friction of approx. 0.001-0.002) of high-quality grooved ball bearings that offer a high static and dynamic load capacity, wear life, range of temperature and reliability. The external track is usually connected with the stationary machine part (motor housing) and the internal track connected with the machine part (motor axis/rotor).
In the Nanotec motors, the thrust bearing is on the shaft output side (A-side) and takes over the radial support and the axial guiding in both directions at the same time) whereas the non-locating bearing on the B-side only takes over the radial support and allows an axial shift through the integrated equalizing shim washer or wave spring washer. For all standard motors, the maximum admissible radial and axial forces are specified in the datasheet.
In order to transmit higher radial forces, space saving bearings with different inside and outside diameters are also deployed. For applications with higher axial forces (such as helically toothed pinions or spindle drives), integrated angular contact ball bearings ensure the necessary safety.

The linear bearing preload reduces the axial play between the bearing balls and the internal and external rings of the bearings, and above all also reduces the danger of damage to the bearings that are caused by the forces of vibration due to eccentric loads or linear deformations of the shaft that occur as well as thermal deformations, bracings and deformations of the supplementary parts to be mounted.
Relative motions between bearing rings, shafts and casings are avoided by the use of appropriate sizes. The rigid fit is, therefore, also necessary so that the relatively thin seal support rings do not bend under the load, but are supported around their entire circumference.

The ZZ covers used in the standard bearing offer a certain protection against gross contamination and escape of grease whereas the grease lubrication used produces a low coefficient of friction at a temperature of -20 °C to + 130 °C and ensures maintenance-free operation with high service life (20,000 h for a standard motor).

In addition to the standard bearings and depending on the wide range of different applications, Nanotec also offers a wide range of special bearings made of special materials or chrome-alloyed special steels with different outside and inside diameters, with contacting, non contacting and contact-free covers and seals made of plated steel sheet, steel-reinforced NBR and high temperature sealing with optimized bearing clearance and higher precision classes to DIN620T2.