Kumera – Propulsion Gearboxes

Propulsion gearboxes product range includes Controllable Pitch Propeller (CPP) standard gearboxes, hybrid propulsion gearboxes, as well as customized propulsion gearboxes.

Product features

two-speed capability, i.e. switching between two ratios
two-step capability, i.e. high ratios (> 6:1)
a high number of integrated PTOs/PTIs on each gearbox
customized high torque/power PTOs/PTIs
integrated hybrid capability
Tailored and standard gearboxes including original spare parts

Controllable Pitch Propeller (CPP) Propulsion Gearboxes

Controllable Pitch Propeller (CPP) standard gearboxes include eight models, ranging from 100 kW to 5000 kW. The model range is described by the centre distance between input-output shafts in millimeters.

Gearbox type	Ratio range	Power range (kW)	Max rpm
200	2:1/5:1	100-350	3600
250	2:1/5:1	200-500	3000
300	2:1/6:1	300-800	3000
375	3:1/7:1	350-1500	3000
450	3:1/7:1	500-2000	3000

For special requirements the standard model may also be modified in a cost-efficient way. Larger than 5000 kW models are tailored according to customer requirements.

Standard features

built-in hydraulic servo for propeller pitch operation
a high number of integrated PTOs/PTIs on each gearbox
a wide range of high torque/power PTOs/PTIs
integrated hybrid capability
DNV-GL Type Approval

Optional features

two-speed capability, i.e. switching between two ratios
two-step capability, i.e. high ratios (> 6:1)Two-speed, i.e. to transmission ratios
OD-box for propeller pitch operation
condition monitoring system
shaft brake

Standard features

built-in hydraulic servo for propeller pitch operation
a high number of integrated PTOs/PTIs on each gearbox
a wide range of high torque/power PTOs/PTIs
integrated hybrid capability
DNV-GL Type Approval

Optional features

two-speed capability, i.e. switching between two ratios
two-step capability, i.e. high ratios (> 6:1)Two-speed, i.e. to transmission ratios
OD-box for propeller pitch operation
condition monitoring system
shaft brake

Hybrid Propulsion Gearbox Systems

Norway is the global hub for developing advanced hybrid propulsion lines for the maritime industry. Kumera Marine AS in Hjelseth is considered as the leading corporation in the hybrid propulsion segment.

Gearboxes has become an enabler for advanced propulsion solutions resulting in lower operational cost and greatly improved environmental conditions.

Kumera offers both two-input shaft hybrid gearboxes, gearboxes with a Power Take In (PTI) second power source and in-line hybrid gearboxes.

Kumera has established a well-known position within the hybrid propulsion system. We work closely with key strategic partners to keep our position as the leading corporation within the hybrid propulsion system!

Kumera - Customized Propulsion Gearboxes

Kumera offers a wide range of standard gearboxes. The standard gearboxes may also be customized according to special requirements.

Utilizing a modular design-base a customized gearbox can be developed with a limited amount of work and high functionality.

Customized gearboxes will be tailored to the specific vessel’s operational profile and tasks, supporting the required performance at low operational cost. Please see below for some different cases:

Kumera – Tug hybrid propulsion gearbox

For the tug BB-Power a 4MW gearbox with two driving shafts was manufactured. The design was based for a vessel concept developed by the ship owner Bukser & Berging. Each gearbox is driven by two diesel engines, a small and a large one. The engines can be used separately or simultaneously for boost effect. This helps optimizing the engine running conditions vs. the specific vessel operation. The gearbox also has a two-speed capability, i.e. two built in transmission ratios between engines and propeller. This will allow efficient operation in different modes such as transit and bollard pull.

Kumera – Small Water Area Twin Hull (SWATH) propulsion gearboxes

For a Small Water Area Twin Hull (SWATH) vessel built in Taiwan, Kumera has developed a gearbox configuration for the propulsion line, utilizing two bevel gearboxes per propulsion line. This is a cost effective design, based on our excellent experience with bevel gearboxes, fitting perfectly into the slender hulls of the SWATH concept.

Tresfjord LNG ferry

The ferry Tresfjord, owned by Fjord 1, was re-powered to integrate LNG based propulsion, in addition to the original diesel propulsion. Kumera supplied an intermediate gearbox in-order-to allow the integration of the added LNG system.

Benefits

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