Marine Gears
Marine Gear Units are ideally
applied in Ships for:
- Diesel engine propulsion lines
- Gas turbine propulsion lines
- Steam turbine propulsion lines
- Electric motor propulsion lines
- Combined propulsion lines
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Marine
gears are referred to the complete set of gears that is applied in the
marine applications. Luxury yachts, Commercial ships, Cruise liners,
Warships, patrol boats or high-speed ferries are all fitted with marine gear
units.
In Marine Gears physical, performance and other features vary considerably.
A Marine Gear that has a high performance can have a size in the range of
300 mm to even 5 meters. Power transmission can start from say as little as
225 kilowatts to astronomically high rate of 50,000 Kilowatts. Not only huge
power transmission marine gears are also associated with high speeds. For
example the gears found inside a fast craft vessels are capable of
generating speeds that is at the least 25 knots or 29 mph., are considered
high performance. A high performance Marine Gearbox can have a power/weight
ratio that is more than 1.5 kilowatts/kilogram and a pitch-line velocity of
a minimum 120 m/sec.
Prime
Features of Marine Gears
Marine drives are supposed to meet stringent demands. To rise up to such
high expectations Marine gears comes with some features that are unique in
itself. Discussed here are a few of such features.
- Handling huge power loads : Marine gears are designed to
sustain massive power loads required by the warships. They can handle
power as high as 50,000 kilowatts.
- Low-weight requirements : In marine gear applications one
major criteria is for low weight, but , without any compromising on
factors like stability, smooth running, capability and efficiency of the
gear transmission.
- Power Transmission from twin engines : This feature of
having two or more engines is in stark contrast to the non marine gears.
Take the case of a luxury yacht or a state-of-the-art warship, mostly
marine vessels comprise two or more engines. The use depends on whether
they’re in a small harbor or cruising on the open sea.
- Resistance to external forces : Gear Box absorbing about 30%
of the external forces.
- Varying reduction ratios : In cases of big marine vessels,
the multiple inputs are primarily the gas turbines, diesel engines or
may be electric motors. Based on such combination, the power sources
operate at speeds that are different. So the need in Marine Gears is
gear trains that has different reduction ratios.
- Complex Gear Designs : This a typical feature of marine
gears where the gears are designed to fit in the restrictions of space.
