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Propulsion Gearbox

Marine reduction gearboxes for propulsion systems

2types 10manufacturers 619models
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Every equipment type in Propulsion Gearbox links to full manufacturer and model data, specifications and service notes.

Propulsion Gearbox / Reduction Gear
A reduction gear exists because diesel and gas turbine engines run efficiently at speeds far higher than a propeller can use without cavitating — the gearbox is what lets the engine and the propeller each turn at the speed that suits them.
595 models
Reduction Gearbox
A reduction gearbox exists because a diesel engine runs efficiently at speeds a propeller cannot use without cavitating — it steps the engine's shaft speed down through precision gearing, and because that gearing carries the full propulsion torque, its condition is often the real limit on how much power a vessel can actually deliver to the water.
24 models
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Manufacturers.

All 10 manufacturers with models in Propulsion Gearbox. Every name opens a search across the full library.

Search by manufacturer AFRISOWISKASwagelokAlfa Laval S.p.A.MAN Energy SolutionsWärtsiläEndress+HauserABB MarineAlfa LavalMacGregorNovenco MarineCarrier MarineSiemens MarineHeinen & HopmanDaikin Marine
Knowledge

What a Propulsion Gearbox engineer checks first.

A slow-speed two-stroke main engine can drive the propeller shaft directly, but most medium- and high-speed four-stroke engines run at several hundred to over a thousand RPM, far above what a propeller can use efficiently — a large propeller running too fast cavitates and loses thrust rather than gaining it. A reduction gearbox sits between engine and shaft, using a set of precision-cut gears to bring engine speed down to propeller speed, typically at ratios from around 3:1 up to 7:1 or higher depending on engine type and propeller diameter…

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