Hamilton Jet HJ241, Manual

Page: 43 / 202

3.9
3 DESIGN BASICS
3.3 D
RIVELINES
HJ-241 / HSRX
The curved face teeth couplings are flexible enough
to compensate for misalignments and axial
movements of coupled shafts. The same type of
coupling also allows for greater shaft offset.
Manufacturers recommendations regarding
installation and alignment should be followed.
NOTE: A double jointed coupling is required.
LONG DRIVESHAFTS:— Where the distance
between the gearbox flange and the Coupling flange
exceeds that possible with a MAC, then a fixed
Lineshaft supported on pedestal bearings should be
used in conjunction with either universal driveshafts
or torsionally flexible couplings.
Refer to Figure 18:
Long Driveshafts .
NOTE: If a TFC is not required between the gearbox
and the Lineshaft, then the Lineshaft can be
directly attached to the gearbox flange using
normal propeller shafting criteria. The
gearbox should be mounted rigidly to avoid
misalignment.
3.3.4 Universal Driveshaft Alignment
1. There are only two allowable configurations for
location of centrelines for the Jet Unit and
Gearbox, these are shown in
Figure 19: Z Config-
uration Coupling and Figure 20: W Configuration
Coupling .
2. The universal Driveshafts must be assembled
with the yokes (forks) in the same plane.
3. Correct running length of the shaft is with the
shaft extended to half the total spline extension
length.
4. The splined end of the driveshaft is heavier and
should be installed at the gearbox end of the
driveline.
NOTE:
1. When the TFC couples directly to a universal
driveshaft, the TFC must provide a bearing to
support the universal driveshaft.
2. When the TFC couples directly to a Lineshaft
supported on bearings, a support bearing is
not required.
Figure 18: Long Driveshafts
COUPLING WITHOUT SUPPORT BEARING
TORSIONALLY FLEXIBLE FLYWHEEL
A°
JET COUPLING
A°
DOUBLE UNIVERSAL SLIP JOINT
OFFSET ANGLES EQUAL
DRIVE SHAFT
ENGINE FLYWHEEL
SUPPORT BEARINGS
LINESHAFT WITH