{"id":1357,"date":"2026-07-17T08:04:51","date_gmt":"2026-07-17T08:04:51","guid":{"rendered":"https:\/\/metalite.net\/?p=1357"},"modified":"2026-07-17T08:42:56","modified_gmt":"2026-07-17T08:42:56","slug":"right-angle-planetary-gearbox-for-marine-deck-winch","status":"publish","type":"post","link":"https:\/\/metalite.net\/ko\/application\/right-angle-planetary-gearbox-for-marine-deck-winch\/","title":{"rendered":"Right Angle Planetary Gearbox for Marine Deck Winch Systems"},"content":{"rendered":"
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Marine & Offshore \u00b7 Drive Engineering<\/p>\n

Right Angle Planetary Gearbox for Marine Deck Winches and Anchor Handling Systems<\/h2>\n

Marine deck winches operate at the intersection of extreme mechanical load and an environment that corrodes, contaminates, and thermally cycles components far more aggressively than most land-based applications. This article covers the engineering requirements, gearbox selection criteria, and installation factors specific to deck winch, anchor-handling, and mooring drive systems.<\/p>\n<\/div>\n

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307 Series R-type ring-output planetary gearbox on an offshore supply vessel deck winch \u2014 12,500 Nm, hydraulic motor input<\/p>\n<\/div>\n<\/div>\n

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\"Marine<\/h2>\n

The Marine Winch Drive Environment: What the Gearbox Must Withstand<\/h2>\n

A deck winch gearbox on a commercial vessel or offshore platform faces a combination of stresses that no land-based drive encounters simultaneously. Salt spray, temperature cycling between \u221230 \u00b0C in Arctic operations and +45 \u00b0C in tropical waters, continuous vibration from hull flexure, and the dynamic shock loading of wave-action on a loaded wire rope all act on the gearbox at the same time.<\/p>\n

Beyond environmental factors, the load profile is inherently variable and frequently includes sudden overloads. When a mooring line snatches \u2014 a rapid tension spike caused by a breaking wave pulling the vessel away from the dock \u2014 the winch drum receives an instantaneous torque input that can reach 4\u20136\u00d7 the nominal line pull rating. The gearbox must absorb this without tooth fracture or bearing race indentation.<\/p>\n

A right angle planetary gearbox<\/strong> addresses both the environmental and load challenges in ways that parallel-shaft helical and worm drives cannot match. The planetary stage distributes shock loads across three planet gear contacts, while the sealed spiral bevel housing \u2014 when correctly specified for marine duty \u2014 maintains lubricant integrity across the full temperature and contamination range encountered at sea.<\/p>\n

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For high-torque marine and aquaculture winch applications, see our detailed guide on
\nmarine winch gearbox for high-torque pulling in aquaculture and dredging<\/a> \u2014 covering drum sizing, wire rope selection, and gearbox integration for subsea and surface winch systems.<\/p>\n<\/div>\n

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Torque and Speed Parameters for Marine Winch Gearbox Selection<\/h2>\n

Marine winch capacity is specified by line pull (kN) and line speed (m\/min). Converting these to gearbox output torque requires the drum diameter:<\/p>\n

Output Torque (Nm)<\/span> = Line Pull (N) \u00d7 Drum Radius (m)
\nOutput Speed (RPM)<\/span> = Line Speed (m\/min) \/ (\u03c0 \u00d7 Drum Diameter (m))
\nGear Ratio<\/span> = Motor Speed (RPM) \/ Output Speed (RPM)<\/div>\n

Worked example \u2014 10-tonne mooring winch:<\/strong> Line pull = 100 kN, drum radius = 0.22 m, required line speed = 15 m\/min, hydraulic motor speed = 200 RPM.<\/p>\n

Output torque = 100,000 \u00d7 0.22 = 22,000 Nm<\/strong>. Output RPM = 15 \/ (\u03c0 \u00d7 0.44) = 10.8 RPM<\/strong>. Required ratio = 200 \/ 10.8 = 18.5:1<\/strong>. The EP309R (18,000 Nm rated) at ratio 20:1 is the correct frame \u2014 apply a service factor of 1.25 for snatching load, giving effective rating 18,000 \u00d7 1.25 = 22,500 Nm, which covers the 22,000 Nm requirement.<\/p>\n

\n\n\n\n\n\n\n\n\n
Winch Application<\/th>\nLine Pull<\/th>\nDrum Torque<\/th>\nRecommended Frame<\/th>\n<\/tr>\n<\/thead>\n
Small anchor windlass (yacht \/ workboat)<\/td>\n5\u201315 kN<\/td>\n1,000\u20133,500 Nm<\/td>\nNB300R \/ NB301R<\/a><\/td>\n<\/tr>\n
Mooring winch (coastal vessel)<\/td>\n50\u2013120 kN<\/td>\n8,500\u201318,000 Nm<\/td>\nEP306R \/ EP309R<\/a><\/td>\n<\/tr>\n
Anchor handling (offshore supply vessel)<\/td>\n150\u2013300 kN<\/td>\n18,000\u201340,000 Nm<\/td>\n307 Series \/ EP311R<\/a><\/td>\n<\/tr>\n
Towing & salvage winch<\/td>\n300\u2013600 kN<\/td>\n40,000\u2013100,000 Nm<\/td>\n307 \/ EP313R\u2013EP315R<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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Marine-Duty Sealing and Corrosion Specification<\/h2>\n

Standard industrial gearbox sealing is insufficient for marine deck installations. Salt-laden air at 3\u20135% NaCl concentration reaches the gearbox continuously in deck service, and occasional green water events \u2014 waves breaking over the bow deck \u2014 mean the gearbox must survive complete submersion for 30\u201360 second intervals without water ingress.<\/p>\n