Wärtsilä Double Input Gear

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Wärtsilä Double Input Gear

Wärtsilä double input, single stage reduction gears connect two engines to a single propeller shaft and cover a power range from 2,000 to 25,000 kW. The gears are available with a horizontal offset between the input shafts and output shaft to allow two (diesel) engines to be connected.

Wärtsilä Double Input Gear


  • Clutches to disconnect the propeller from the main engine(s)
  • A primary driven PTO, rotating whenever the engine is running or a secondary driven PTO, which rotates whenever the propeller is rotating.
  • Combined power take-off / power take-in (PTO/PTI) 


    Double input gears are applied to combine the output power of 2 medium speed diesel engines on a single propeller shaft. Typical applications include:

    • Anchor handling tug supply (AHTS) vessels
    • Fast patrol vessels
    • High power cargo vessels with medium speed (dual fuel) engines
    • Ferries

    A key dimension of a double input gear is the horizontal offset, which is determined by the required service space between the two propulsion engines. Wärtsilä double input gears can be combined with Wärtsilä engines, as indicated in the table below, as well as with other engine brands.

    Technical Info

    Double input gear tech-information


    Double Input Gear - Features

    Power take-off (PTO)
    Power take-in (PTI)
    Hydraulic power unit
    Special gears

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