Torque ratings — continuous vs maximum, what drives the sizing
The GBX0800040703D: The continuous output torque is 115 N.m, while the maximum output torque peaks at 184 N.m. The continuous figure governs the thermal steady-state — running a conveyor or rotary indexer at 115 N.m keeps the gear mesh temperature within the 30,000-hour service life window at 100 rpm and 30 °C. The 4:1 reduction ratio means the input speed is four times the output speed, and the input torque is one-quarter of the output torque (less the 4% loss from 96% efficiency). That efficiency figure is the thermal budget — 4% of the transmitted power becomes heat inside the housing.
Load ratings at 100 rpm — bearing life under radial and axial forces
Maximum radial force Fr is 650 N at 100 rpm for the 30,000-hour service life, applied at mid-distance from the output shaft. For a 10,000-hour duty cycle, that rises to 950 N at the same speed. Maximum axial force Fa is 900 N at 100 rpm for 30,000 hours, or 1200 N for 10,000 hours at 30 °C. These are the limits for belt-drive or direct-coupled loads — exceeding them shortens the bearing life faster than the gear tooth wear.
Backlash and torsional rigidity — positioning accuracy in servo loops
Maximum torsional backlash is 12 arc.min, and torsional rigidity is 6 N.m/arcmin. For a pick-and-place or indexing axis, the 12 arc.min backlash means the output shaft can rotate up to 0.2° before the gear teeth engage in the reverse direction — acceptable for general positioning, not for zero-backlash cam-follower applications.
Mounting and environmental fit for the press-side layout
The gearbox mounts in any position — horizontal, vertical shaft-up, or vertical shaft-down — which simplifies integration into a tire-curing press where the gearbox may sit beside the steam platen. The 80 mm external diameter and black anodized aluminium housing keep the envelope compact and corrosion-resistant. Shaft output sealing is IP54, meaning dust-protected and splash-resistant — adequate for the dry side of a press cell, but not for washdown zones. Lubricated for life — no oil-change interval to schedule in the PM plan. The straight-tooth spur gear set is noisier than helical, but the 60 dB at 1 m (no-load) is within typical industrial floor limits.