Torque and reduction — what the ratings mean
The GBX1200091003F: The 9:1 reduction ratio steps motor speed down by a factor of nine, multiplying torque accordingly. Continuous output torque is 210 N.m at 100 rpm and 30 °C — this is the sustained load the gearbox can carry without exceeding its 30,000-hour service life. Maximum output torque reaches 336 N.m under the same conditions, intended for intermittent peak loads, not continuous duty.
Mechanical constraints — forces, backlash, and stiffness
Maximum radial force Fr is 1500 N at 100 rpm for a 30,000-hour life, rising to 2000 N for a 10,000-hour life. Axial force Fa follows the same pattern: 2100 N for 30,000 hours, 2800 N for 10,000 hours. Both forces are measured at the mid-point of the output shaft. Maximum torsional backlash is 12 arc.min, and torsional rigidity is 13 N.m/arcmin — these define positioning repeatability in servo-driven indexing or pick-and-place applications.
Environment and maintenance
The shaft output seal is rated IP54 — protected against dust ingress and splashing water, but not submersion or high-pressure washdown. The gearbox is lubricated for life, eliminating routine oil changes. Noise level is 65 dB at 1 m, no-load — typical for a straight-tooth planetary of this size.
Efficiency and construction
Rated efficiency is 94 % — the power loss is 6 % of the transmitted torque, dissipated as heat through the black anodized aluminium housing. The shaft material is C45 carbon steel. The gearbox external diameter is 120 mm.