The requirements of this Chapter, except where otherwise stated are
applicable to oil engine gearing for main propulsion purposes and for engine gearing for
driving auxiliary machinery which is essential for the safety of the ship or for safety
of persons on board where the transmitted powers exceed 220 kW (300 shp) for propulsion
drives, and 110 kW (150 shp) for auxiliary drives. Alternatively calculations using the
methods defined in ISO 6336 – Calculation of load capacity of spur and helical
gears, will be considered. In any mesh, the terms pinion and wheel refer to the
smaller and larger gear respectively. For turbine gearing the loading factors K
A, K
F
α, K
F
β, K
H
α, K
H
β and K
γ will be considered. Bevel gears will be specially considered on the basis
of a conversion to equivalent helical gears. For torsional vibration requirements,
see
Pt 5, Ch 8, 2.3 Scope of calculations.