Iveco Marine Diesel Engines, Installation Handbook

Page: 37 / 132

MARCH 2004 DRIVE
3.37
MARINE ENGINES INSTALLATION
Drive with universal joint shaft
Some installations may need an angle drive or offset drive; the right solution is provided by the univer-
sal joint shafts:
■
W layout, angle drive
■
Z layout, offset drive
In the applications with universal joint shafts it is necessary to strictly observe the use and installation
instructions provided by the manufacturers to prevent any faults due to the drive supplied with uneven
speeds. In this respect, we point out the following basic information.
UNIVERSAL JOINT AXES
A. W layout - B. Z layout (constant velocity).
To obtain constant velocity, i.e. the motion uniformity, it is necessary to use two joints together, making
sure that the offset angles are the same (layout B in figure 3).
The maximum admissible values for operating angles vary according to the type of joint and the rota-
tion speed and cannot exceed the values prescribed by the manufacturer.
All the technical information needed for the installation of the universal joint drive shall be supplied by
the shaft manufacturer; they are about the joint admissible performance but not about the admissible
characteristics of the engine/reducer-inverter bushes and bearings.
Prescriptions:
■
The drive based on shafts fitted with universal joint shall be connected to the engine by means of
the suitable joint with flanged bell on the flywheel housing (see Section 10, paragraph 10.2).
■
It is not possible to apply directly a universal joint on the engine flywheel, save specific approval and
the insertion of the suitable elastic component between the engine flywheel and the shaft. Check
the joint weight resting on the flywheel.
■
Check also the twisting and bending moment resting on the reducer-inverter.
Figure 3
A
B