Wärtsilä Twin Input Gears
Gears with twin input and single propeller speed.Wärtsilä designation TCH.
The horizontal offset between the two propulsion engines, are defined by the engine maker, in order to create service space for the engines.
The following standard options are available:
- Integrated thrust bearing
- Integrated hydraulic clutch
- Power take off for shaft generator (PTO)
- Power take in for electric motor (PTI)
- Connection for OD-Box
- Gear driven oil pumps
|Gear Type|| Engine
|TCH250||2500||Wärtsilä 26 (L-version)|
|TCH270||2700||Wärtsilä 7L32, Wärtsilä 8L32, Wärtsilä 9L32|
|TCH310||3100||Wärtsilä 12V26, Wärtsilä 16V26, Wärtsilä 38 (L-version)|
|TCH350||3500||Wärtsilä 12V32, Wärtsilä 6L46F, Wärtsilä 6L50DF|
|TCH370||3700||Wärtsilä 16V32, Wärtsilä 18V32, Wärtsilä 8L46F, Wärtsilä 9L46F, Wärtsilä 8L50DF, Wärtsilä 9L50DF|
|TCH380||3800||Wärtsilä 12V38, Wärtsilä 16V38, Wärtsilä 18V38|
Conditions for use
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All Wärtsilä gears can be supplied with one or more PTOs for driving the shaft alternator, compressor or pump. For single vertical and horizontal gears, the standard PTO is primary driven. For double gears, the PTO is optionally primary or secondary driven.
A primary driven PTO is rotating whenever the engine is rotating.
A secondary driven PTO is rotating whenever the propeller shaft is rotating.
Most Wärtsilä gears can be supplied with a combined PTO/PTI. In PTI mode the shaft alternator can also be used as an electric motor. PTI is normally used for the following operation modes:
PTI “Booster” mode is used when the main power of the engine is too small, in order to increase the total propulsion power. For this mode, no clutches are required on the gear.
PTI “Take me home” mode is used in case of emergency, if the prime mover is out of operation. For this mode a minimum of 2 clutches are required on the gear.
Most Wärtsilä gears are purpose-designed with an integrated hydraulic system for both the gear and the CP propeller. As the separate hydraulic power unit for the CP propeller is superfluous, both installation costs for the yard and operational costs for the owner are reduced. For safety reasons the gear mechanically drives the main pump for the propeller. All gears can also be interfaced to a separate hydraulic power unit.
For the 16400 dwt chemical tanker ‘Sten Idun’, delivered in 2003, Wärtsilä is supplying an extensive machinery package that includes a Wärtsilä 6L46 main engine, gearbox, controllable pitch propeller and rudder. »