Marine Gearboxes
Source marine gearboxes from India's verified manufacturers and exporters on Himalay. Browse marine transmission gearbox and marine PTO gearbox for industrial and export applications.
Browse Marine Gearboxes by Type
About Marine Gearboxes
Marine gearboxes transmit power from a marine diesel or gas engine to the propeller shaft (or to auxiliary equipment), providing speed reduction, directional reversing and, in most propulsion units, a clutch for ahead, neutral and astern. A reverse-reduction gearbox pairs a reduction gear train with two clutch packs so the output can be driven ahead or astern at the same reduction ratio and torque, while pure reduction or power-take-off variants serve specific duties. The reduction lets a high-speed engine swing a larger, slower, more efficient propeller.
The family covers marine transmission (reverse-reduction) gearboxes for displacement and planing craft, marine PTO and PTI drives for shaft generators, pumps and hydraulics, and dedicated reduction gears. Propulsion reduction ratios are commonly in the range of about 1.5:1 to 3:1 for fast craft and higher for workboats and trawlers; ratings span small auxiliary units to several hundred kW and more. Gears are typically cut to ISO 1328 / AGMA 2015 grades and load-rated to ISO 6336 / AGMA 2001, with manufacturers' continuous and intermittent duty ratings.
Construction uses case-hardened alloy-steel gears (18CrNiMo7-6, 20MnCr5), ground or lapped, in rigid cast-iron or fabricated steel housings, with hydraulically actuated multi-disc clutches, marine-grade bearings, seals and integral or external oil cooling. Where specified and partner-dependent, units can be built and documented toward classification-society survey (IACS members such as Lloyd's Register, DNV, ABS or IRS); approval scope is project-specific.
Units are configured by ratio, engine power and rpm, propeller-shaft direction, control (mechanical, hydraulic or electronic), trolling-valve and PTO options. Himalay's MSME partners manufacture marine gearboxes with gear-rating to AGMA/ISO 6336 where engineering data is required, ISO 9001 quality systems, load and efficiency test reports and traceability; CE (Machinery Directive), classification-society survey where specified and partner-dependent, and SABER (Saudi Arabia) coordinated as part of the standard order flow.
