NSK is introducing a high-performance bearing for servomotors that reduces the emission of particles such as grease and oil. This breakthrough development will contribute to the stable operation of vital industry machines such as robots. To identify a potential way of overcoming the issue of particle emissions from bearings, NSK undertook research into the mechanism behind this long-standing industry problem. Each servomotor houses two bearings: a load-side bearing supporting the shaft where it exits the servomotor; and a counter load-side bearing located between the brake disc and encoder disc.
Less particles for longer operation
In high-temperature environments such as servomotors, bearings tend to scatter tiny particles of grease and oil as they rotate. These emissions stick to the discs and cause issues such as encoder read errors and brake slippage. The need for bearings with low-particle-emission performance is clear in applications of this type, which is why NSK set about developing anti-scatter grease and seals that provide a high level of hermeticity.
The new NSK grease restrains evaporation in high-temperature environments such as servomotors and uses superior thermally resistant components to ensure low particle emissions and better resistance to seizing. NSK´s new rubber seal features a redesigned lip shape that again supports low particle emissions, while also facilitating 10% lower torque.
Aside from servomotors, NSK´s new bearing is also suitable for other products that require low-particle-emission performance, contributing to stable operation in a wide range of industrial machinery.
