1278516991595a1267106724867-brochure-o-wartsila-solutions-2015

PROPULSORS & GEARSWÄRTSILÄ GEARSWärtsilä gears have been designed to meet the highest standards ofoperational efficiency, reliability and low noise and vibration.Gear configurations• z Single input gears: gears with single input and single propellerspeed. Wärtsilä designation SCV for vertical offset, and SCH forhorizontal offset. Available with or without clutch.• z Double gears: gears with twin input and single propeller speed.Wärtsilä designation TCH.• z 2-speed gears: gears with single input and 2 propeller speeds.Wärtsilä designation SCV/2 for vertical offset, and SCH/2 forhorizontal offset.All Wärtsilä gears can be supplied with built in multi-disc clutches.Power take-off (PTO)All Wärtsilä gears can be supplied with one or more PTOs for drivingthe shaft alternator, compressor or pump. For single vertical andhorizontal gears, the standard PTO is primary driven. For double gears,the PTO is optionally primary or secondary driven.• z A primary driven PTO is rotating whenever the engine is rotating.• z A secondary driven PTO is rotating whenever the propeller shaftis rotating.Power take-in (PTI)Most Wärtsilä gears can be supplied with a combined PTO/PTI. In PTImode the shaft alternator can also be used as an electric motor.PTI is normally used for the following operation modes:• z PTI “Booster” mode is used when the main power of the engine istoo small, in order to increase the total propulsion power. For thismode, no clutches are required on the gear.• z PTI “Take me home” mode is used in case of emergency, if the primemover is out of operation. For this mode a minimum of 2 clutches arerequired on the gear.Integrated or separate hydraulic system for gear andcontrollable pitch (CP) propellerMost Wärtsilä gears are purpose-designed with an integrated hydraulicsystem for both the gear and the CP propeller. As the separate hydraulicpower unit for the CP propeller is superfluous, both installation costsfor the yard and operational costs for the owner are reduced. For safetyreasons the gear mechanically drives the main pump for the propeller.All gears can also be interfaced to a separate hydraulic power unit.122