Great advantages with a 2-speed gearbox system giving optimised running conditions and considerable energy savings
The 2-speed reduction gearbox is a fully integrated solution to provide the option for two steps of different propeller speed in a diesel mechanical configuration. The system is ideal for vessels with variations in power requirements, such as Purse Seiners, Trawlers, AHTS, Seismic vessels, Mega Yachts and Rescue vessels.
The graphs of Step1 and Step2 in the diagram show the direct effect of reducing the rpm using the 2-speed reduction gearbox.
The 2-speed gearbox design and construction is based on the same principles as for all Brunvoll gearboxes, and benefit from a reliable high quality philosophy.
The gear housing is as standard made from high quality grey cast iron, designed with high stiffness and good vibration damping property. However, nodular cast iron is available as option (typical in high Ice class applications).
Gears are designed and manufactured with high precision and optimised for high load, low vibratory excitation and long lasting. Extensive use of sliding bearing (long lasting) for both journal bearings and thrust bearings. Clutches are of high capacity, hydraulically operated, multiple disc, oil lubricated type.
Gearbox fulfil all Class Society requirements.
The gearboxes are designed in 3D and analysed for full load to ensure excellent performance.
Selected Brunvoll references
Brunvoll CP-Propulsion System, Tunnel Thrusters and Control Systems