Chapter 3 Front Power Take Off; Marine Installation Requirements - Doosan MD Series Installation Instructions Manual

CHAPTER 3 FRONT POWER-TAKE-OFF

3.1. Marine Installation Requirements

•
Belt-driven accessories must be mounted on the engine when a flexible mounting system is
used.
•
Brackets used to mount accessories must provide adequate strength to hold the static and
dynamic load of the accessory and avoid resonant vibration within the normal operating
range of the engine.
•
Variance in accessory loads must be considered when selecting accessory drive location
and capacity. Design service factors given in the installation recommendations should be
used when determining accessory loads.
•
Belt-driven equipment must be held in alignment to a tolerance of 1 mm in 200 mm (1/16
inch in 12 inches).
•
The total power taken off at the front of the crankshaft cannot exceed the maximum capacity
of the FPTO clutch and the total power absorbed from the engine may not exceed the
specified value of each model.
•
All exposed rotating components must have a protective guard.
3.2. Front Power Take-off Clutches
More power may be taken from a direct drive at the front of the crankshaft than any other
accessory drive location. Many DOOSAN marine engines can be fitted with FPTO clutch for
driving accessories such as a winch, fire pump, hydraulic pumps or generator.
All direct driven equipment will have some effect on torsional vibration. Excessive torsional
vibration in a system can result in excessive noise, gear failure, main bearing wear or, in the
most severe cases, crankshaft failures.
The total power taken off at the front of the crankshaft cannot exceed the capacity of the
FPTO clutch and the total required power from the engine may not exceed the values in the
list below.
This is the maximum amount of power that can be transmitted through the particular clutch.
3.2.1. For maximum FPTO power
For front power take-off in engine, install a
flexible coupling to the engine front crank
shaft pulley and connect drive shaft and V-
pulley by supporting them with two pillow
blocks as shown in Fig. It is a standard
procedure to support driveshaft and V-
pulley with two pillow blocks by using
flexible coupling for connection to engine.
DOOSAN recommends you this type to
use front power take-off. (FPTO).
Engine
- 13 -
Fiexible coupling
V-pulley
Driveshaft
Crank pulley Pillow blocks
EA4O7001