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MAN B&W 4.04
combinator mode. <strong>Th<strong>is</strong></strong> will, however, require an
additional RENK Constant Frequency gear (Fig.
4.01.01 alternative 2) or additional electrical equipment
for maintaining the constant frequency of
the generated electric power.
Tunnel gear with hollow flexible coupling
<strong>Th<strong>is</strong></strong> PTO system <strong>is</strong> normally installed on ships
with a minor electrical power take off load compared
to the propulsion power, up to approximately
25% of the engine power.
The hollow flexible coupling <strong>is</strong> only to be dimensioned
for the maximum electrical load of the power take off
system and th<strong>is</strong> gives an economic advantage for minor
power take off loads compared to the system with an
ordinary flexible coupling integrated in the shaft line.
The hollow flexible coupling cons<strong>is</strong>ts of flexible
segments and connecting pieces, which allow
replacement of the coupling segments without
d<strong>is</strong>mounting the shaft line, see Fig. 4.04.02.
Fig. 4.04.02: Generic outline of BW IV/GCR, tunnel gear
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
Page 2 of 3
Generator step�up gear and flexible coupling
integrated in the shaft line
For higher power take off loads, a generator
step�up gear and flexible coupling integrated in
the shaft line may be chosen due to first costs of
gear and coupling.
The flexible coupling integrated in the shaft line
will transfer the total engine load for both propulsion
and electrical power and must be dimensioned
accordingly.
The flexible coupling cannot transfer the thrust
from the propeller and it <strong>is</strong>, therefore, necessary
to make the gear�box with an integrated thrust
bearing.
<strong>Th<strong>is</strong></strong> type of PTO system <strong>is</strong> typically installed on
ships with large electrical power consumption,
e.g. shuttle tankers.
178 18 25�0.1
198 43 16�8.6