MAN B&W 4.01
Page 4 of 5
MAN Diesel
198 51 95-0.3MAN B&W S46MC-C7/8, S46ME-B8, S42MC7,
S40MC-C9, S40ME-B9, S35MC-C9, S35MC7,
S35ME-B9, L35MC6, S26MC6
PTO/RCF
Free standing generator, BW II/RCF
(Fig. 4.01.01, alternative 2)
The PTO/RCF generator systems have been de-
veloped in close cooperation with the German
gear manufacturer RENK. A complete package
solution is offered, comprising a flexible coupling,
a step-up gear, an epicyclic, variable-ratio gear
with built-in clutch, hydraulic pump and motor,
and a standard generator.
For marine engines with controllable pitch propel-
lers running at constant engine speed, the hy-
draulic system can be dispensed with, i.e. a PTO/
GCR design is normally used, see Fig. 4.01.01,
alternative 5 or 6.
Fig. 4.01.03 shows the principles of the PTO/RCF
arrangement.
The epicyclic gear of the BW II/RCF unit has a
hydrostatic superposition drive. The hydrostatic
input drives the annulus of the epicyclic gear in
either direction of rotation, hence continuously
varying the gearing ratio to keep the genera-
tor speed constant throughout an engine speed
variation of 30%. In the standard layout, this is
between 100% and 70% of the engine speed at
specified MCR, but it can be placed in a lower
range if required.
The input power to the gear is divided into two
paths – one mechanical and the other hydrostatic
– and the epicyclic differential combines the
power of the two paths and transmits the com-
bined power to the output shaft, connected to the
generator. The gear is equipped with a hydrostatic
motor driven by a pump, and controlled by an
electronic control unit.
178 00 45-5.0
Fig. 4.01.03: PTO with RENK constant frequency gear: BW II/RCF, option: 4 85 203
Operator control panel
(in switchboard)
To panel
Hydrostatic control
Hydrostatic motor
Output shaft
Hydrostatic pump
Multidisc clutch
Input shaft
Controller
Terminal
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