Nabtesco cycloidal gears for heavy-duty robots

Heavy-duty robots require robust, precise and dynamic gears with a high load-bearing capacity and a long-lasting design. The compact RV robot gears from Nabtesco are designed for high performance, durability and reliability, making them ideal for heavy loads.

For use in heavy-duty robots Nabtesco offers an extensive range of products for high-performance gear systems with torque ratings of up to 28,000 Nm. The heavy-duty gears are characterised by extreme precision, maximum robustness and a compact design, and can easily handle the heaviest loads.

In cycloidal gears, power transmission is achieved by cams and rollers. This design ensures continuous contact and even distribution of forces within the gearbox, which produces high rigidity. As a result, it is possible to transmit very high torques with maximum precision (hysteresis loss < 1 arc.min). The increase in backlash remains negligible throughout the entire life cycle.

Furthermore, their special design achieves excellent behaviour with respect to dynamics, load capacity and compactness. Even high reduction ratios can be achieved with only two or three gear stages. The integrated main bearings absorb both axial and radial loads and bending moments, and provide for high moment rigidity and resistance to shock loads (up to 500 % of the rated torque).

Nabtesco says the integrated main bearings allow the gears to withstand 250 % higher bending moments than conventional planetary gears of a comparable size. This eliminates the need for additional external bearings, which allows a more compact robot design with maximum precision, dynamics, load capacity and rigidity.

With a torque rating of 28,000 Nm, Nabtesco claims the RV-2800N is currently the largest and most robust precision gearbox in the world. The earbox features an optimal combination of performance, torsional rigidity and compactness, which opens up entirely new applications for robots that in the past were possible only with hydraulic or spindle solutions. This is the case, for example, when moving large panes of glass, sheet steel, machine components or even entire motor vehicles.