Lifetime; Thrust Bearing - Vetus VDR 2 10 25 Instructions D'installation

3.3

Lifetime

The lifetime of the coupling will depend on the size of the angle. Therefore, the
propeller shaft coupling should be installed such that both halves of the cou-
pling are at as identical an angle as possible, so that they will have a near-identi-
cal lifetime and one that is as long as possible.
The graph shows the influence that the angle at which the half of the coupling is
fitted has on the lifetime.
β: Build-in angle of the half of the coupling
L: Lifetime in %
3.4

Thrust bearing

Check whether the thrust bearing is suitable for the maximum possible thrust.
If the maximum possible thrust is not known, an estimate can be made using the
following formula:
where F is the thrust in kN,
P the propeller shaft power in kW or h.p., and
v the speed in knots.
3.5 Support for the thrust bearing
- The thrust bearing has to absorb the full thrust of the propeller.
- A mounting-plate must be fitted as support for the thrust bearing.
- This mounting-plate must, therefore, be sufficiently strong and be joined to
the body of the ship by bolts, laminating or welding in order to transfer the
thrust to the ship.
- Make sure that the mounting-plate is sufficiently stiff to be able to transfer the
thrust to the body of the ship. The mounting-plate must not lose its shape. If
necessary, fit additional stiffeners.
vetus® Propeller shaft coupling 'DRIVE'
ENGLISH
100 %
80 %
60 %
L
40 %
20 %
0° 1° 2° 3° 4° 5°
β
P (kW)
F (kN) ≈ 1.5 x
v (knots)
P (hp)
F (kN) ≈ 2 x
v (knots)
6° 7° 8°
13
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