Volvo D11 series, Руководство по установке

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General arrangement and planning
43
All reverse gears from the genuine Volvo Penta range
are fitted with built-in axial bearings for axial forces
from the propeller shaft. No extra thrust bearings
need to be fitted under normal load conditions. In the
case of ice going vessels with excessive pulsating
axial forces, an additional thrust bearing is recom-
mended in the propeller shaft system. In such cases,
3. Engine with fixed mounts and
fixed shaft seal
. Fixed engine mountings
2. Fixed shaft coupling. (Flexible cou-
pling as an alternative.)
3. Fixed front stern bearing and shaft
seal
4. Water lubricated stern bearing
L. Distance between support points.
For calculation L max see page 50.
C. Distance reverse gear flange – sup-
port point.
Regarding C min see page 50.
C max is calculated in the same way
as L max.
C
L
2
4
3
Flexible coupling
as an alternative
a flexible coupling must always be fitted between the
reverse gear and the thrust bearing so as to eliminate
axial stresses between the two thrust bearings.
If the unsupported propeller shaft length is too long, a
separate support bearing should be fitted. A support
bearing cannot absorb axial stresses.
. Flexible coupling
2. Thrust bearing
2
Axial thrust bearing