Parallel Helical Gearbox
A parallel helical gearbox transmits torque through helical gear stages whose shafts run parallel to one another, with the output offset from the input. The parallel arrangement keeps the high efficiency and quiet, progressive meshing of helical gearing while presenting the output to the side of the input, which suits the unit to side-mounting against a machine and to fitting directly onto a driven shaft. It is a mainstay drive for conveyors, agitators, extruders and bulk-handling equipment where an offset, often hollow-shaft, output is needed.
Parallel helical units are usually two- or three-stage, covering wide ratios; single steps near 1.25:1 to 8:1 build to roughly 200:1 and higher across stages. Per-stage efficiency is generally high, commonly cited near 96-98 percent, leaving multi-stage units well above 90 percent overall. Power ranges from sub-kW gearmotors to several hundred kW on large frames. Load rating follows AGMA 2001/2101 or ISO 6336, with enclosed-drive practice per AGMA 6010 and gear quality to ISO 1328 / AGMA 2015. Foot-, flange- and shaft-mounted (hollow-shaft with torque arm) versions cover most layouts.
Gears are case-hardened alloy steel (20MnCr5 / 18CrNiMo7-6) with ground or lapped profiles, in cast-iron housings (aluminium on the smallest frames), on SKF/FAG-equivalent bearings with shaft seals, breather/drain provision and ISO VG 220/320 mineral or synthetic PAO lubrication.
Hollow output shafts take keyed bores or keyless shrink-disc fittings; solid shafts and flanges are alternatives. Inputs accept IEC/NEMA motor adapters, servo flanges or free input shafts, with several mounting positions available. Service factor is selected per AGMA SF against the duty profile, and ATEX/IECEx and ingress options are available where required.
Himalay's MSME partners manufacture parallel helical gearboxes and gearmotors with gear-rating to AGMA/ISO 6336, ISO 9001 quality systems, load/efficiency test reports and traceability; CE (Machinery Directive), ATEX/IECEx for hazardous areas, and SABER (Saudi Arabia) coordinated as part of the standard order flow.
