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Kumera - Hybrid Propulsion Gearboxes

Hybrid gearboxes are gearboxes with two power sources driving the gearbox, either separately, or in combination for a boost effect. Most will relate hybrid gearboxes to having two “equal” drive shafts, i.e. for two different power sources.

Kumera - Hybrid Propulsion Gearboxes Hybrid

A variation to this is a more traditional gearbox, with one main shaft, but with a Power-Take-In (PTI). E.g. an electric motor can then be fitted at the same location as a PTO, working as a second power source.

With a combined electric motor/generator, a PTI/PTO can be arranged, allowing the electric unit to change modes between driving (the gearbox) as an electric motor (PTO), or being driven (by the gearbox), as a generator (PTO). The latter can e.g. be used to charge a battery pack.

Kumera - Hybrid Propulsion Gearboxes Hybrid

From the gearbox point of view, the two power sources can be any type of similar or different power source, e.g. diesel engine + electric motor, diesel engine + diesel engine, etc.

The main application for hybrid gearboxes are propulsion lines, having great fuel saving potential, resulting in an great environmental advantages, as well as savings in operational cost.

Kumera is your partner in developing a hybrid propulsion line, adapted to the vessel’s specific operational profile.

Please send more information regarding Kumera Hybrid propulsion gearboxes


  • High efficiency – Minimizing power loss and saving energy
  • Modular structure – The ability of adding additional equipment and variety of mounting arrangements
  • Several gearbox sizes and wide range of ratios – Guarantees optimal gearbox size
  • Flexible product structure - Easy to customize for the customer needs

After Sales Services

  • Start-up and installation services
  • Maintenance services
  • Regular inspection visits
  • Maintenance consulting services