Spiral Bevel Gearbox
A spiral bevel gearbox turns torque through intersecting shafts (typically 90 degrees) using bevel gears whose teeth are cut on a curved, oblique (spiral) line across the pitch cone. Because the curved teeth engage gradually rather than all at once, contact is progressive and multiple teeth share load at any instant, giving smoother, quieter running and higher capacity than straight-bevel gearing at comparable size.
Single-stage ratios generally run from about 1:1 up to 6:1, with multi-stage and helical-bevel combinations reaching higher reductions; torque capacities span from a few Nm in light drives to several thousand Nm in industrial frames, and power from fractional kW into the 100+ kW range. Single-stage efficiency typically sits around 94-98% with good geometry and lubrication. Tooth design and rating follow ANSI/AGMA 2005 and 2003 (or ISO 23509 / ISO 10300), with enclosed-drive rating per AGMA 6010 and quality grade per ISO 1328 / AGMA 2015.
Gears are normally case-hardened alloy steel (20MnCr5 / 18CrNiMo7-6), then ground or lapped to develop a controlled tooth-contact pattern; housings are cast iron or aluminium running on rolling bearings (SKF/FAG-equivalent) with lip or labyrinth seals. Backlash is offered in standard, reduced and precision (a few arcminutes) classes.
Configuration covers solid or hollow output shafts, foot, flange (B5/B14) and shaft-mounted arrangements, IEC/NEMA motor adapters or free input shafts, multiple mounting positions, and mineral or synthetic PAO (ISO VG 220/320) lubrication, frequently lifetime-filled. Service factor is selected per AGMA guidance for the duty.
Himalay's MSME partners manufacture spiral bevel gearboxes with gear-rating to AGMA / ISO 6336, ISO 9001 quality systems, load and efficiency test reports and material traceability; CE (Machinery Directive), ATEX/IECEx for hazardous areas, and SABER (Saudi Arabia) coordinated as part of the standard order flow.
