Robot Planetary Gearbox
A robot planetary gearbox is a low-backlash, high-stiffness epicyclic reducer optimised for the joints and axes of industrial robots, cobots and automation arms. Like other planetary units it shares load across planet gears for high torque density in a compact coaxial package, but it is tuned for the demands of robotics: minimal lost motion, high torsional stiffness, low inertia and smooth, quiet running through frequent reversing cycles.
For robot service, single- and two-stage units typically cover about 3:1 to 100:1; where higher single-stage reduction is needed at a joint, harmonic or cycloidal drives are often used instead. Output torque ranges from a few Nm at wrist axes to several hundred Nm at base joints, with per-stage efficiency commonly around 95-98%. Gear accuracy follows ISO 1328 / AGMA 2015 and load capacity ISO 6336 or AGMA 2101. Backlash is the critical dimension: robot grades typically target roughly 1-3 arcmin, with sub-1 arcmin for high-accuracy axes, and torsional stiffness (Nm/arcmin) is specified alongside it for path accuracy.
Construction uses case-hardened, ground or lapped alloy-steel gears (20MnCr5 / 18CrNiMo7-6), precision rolling or integrated output bearings, aluminium housings for low mass and low-friction seals, usually with lifetime-filled synthetic lubrication.
Configuration centres on a servo-motor flange adapter, sometimes with a hollow output for cable routing; solid or flange outputs; compact face mounting; and a chosen backlash class and stiffness suited to the joint duty cycle.
Himalay's MSME partners manufacture robot planetary gearboxes with gear-rating to AGMA/ISO 6336, accuracy to ISO 1328, ISO 9001 quality systems, backlash and efficiency test reports and traceability; CE (Machinery Directive), ATEX/IECEx for hazardous areas, and SABER (Saudi Arabia) can be coordinated as part of the standard order flow.
