Reduction gears

The Rolls-Royce gearbox range is based on the single-input single-output design with built-in clutch and thrustblock - and a wide variety of power-take-offs that enable large-shaft generators to be driven - and electric motors to feed power for get-you-home propulsion or as part of a hybrid propulsion system.

The input shaft is provided with keyway for mounting of the flexible coupling and the output shaft with a cylindrical shaft or flange.

The power, torque and shaft offsets correspond to the current and anticipated market requirements in terms of engine power, speed, and propeller revs to suit a wide variety of offshore, merchant and fishing vessels.

Type or model numbering represents the shaft offset in millimetres, whether vertical, or horizontal to port or starboard. Models 550, 950, 1050, 850 and 650 are available to give a torque range from 90 to 1,200kNm.

Large reduction ratios are a particular design feature, that accommodate all the popular medium-speed engines and permit low efficient propeller speeds to the extent that the hull lines allow.

They are normally equipped with one-step reductions from 1:51 to 5.95:1 (6.25:1). Some applications can be delivered with two-step reduction with maximum ratio up to 12:1.

Supplied for:

• Offshore supply vessels

• Fishing vessels

• Ferries

• Tugs

• Cargo vessels