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MAN B&W 4.04
PTO type: BW II/GCR
Power Take Off/Gear Constant Ratio
The PTO system type BWII/GCR illustrated in Fig.
4.01.01 alternative 5 can generate electrical power
on board ships equipped with a controllable pitch
propeller, running at constant speed.
The PTO unit <strong>is</strong> mounted on the tank top at the
fore end of the engine see Fig. 4.04.01. The PTO
generator <strong>is</strong> activated at sea, taking over the electrical
power production on board when the main
engine speed has stabil<strong>is</strong>ed at a level corresponding
to the generator frequency required on board.
The installation length in front of the engine, and
thus the engine room length requirement, naturally
exceeds the length of the engine aft end
mounted shaft generator arrangements. However,
there <strong>is</strong> some scope for limiting the space requirement,
depending on the configuration chosen.
Fig. 4.04.01: Generic outline of Power Take Off (PTO) BW II/GCR
MAN B&W S70MC/MC-C/ME-C/ME-GI, L70MC-C/ME-C,
S65MC-C/ME-C/ME-GI, S60MC/MC-C/ME-C/ME-GI/ME-B,
L60MC-C/ME-C, S50MC/MC-C/ME-C/ME-B, S46MC-C/ME-B,
S42MC, S40MC-C/ME-B, S/L35MC, S35MC-C/ME-B, S26MC
MAN Diesel
PTO type: BW IV/GCR
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Power Take Off/Gear Constant Ratio
The shaft generator system, type PTO BW IV/
GCR, installed in the shaft line (Fig. 4.01.01 alternative
6) can generate power on board ships
equipped with a controllable pitch propeller running
at constant speed.
The PTO system can be delivered as a tunnel gear
with hollow flexible coupling or, alternatively, as
a generator step�up gear with thrust bearing and
flexible coupling integrated in the shaft line.
The main engine needs no special preparation for
mounting these types of PTO systems as they are
connected to the intermediate shaft.
The PTO system installed in the shaft line can also
be installed on ships equipped with a fixed pitch
propeller or controllable pitch propeller running in
Support bearing, if required
Generator
Elastic coupling
Step-up gear
178 18 22�5.0
198 43 16�8.6