Hydro power planetary gear units

Planetary gear units have been an important part of RENK’s product portfolio for many decades. RENK’s planetary gear units transmit outputs of more than 30 MW and torques of more than 4.5 million Nm.

PAR/PBR planetary gear units are primarily used in the drive trains of Kaplan turbines. Their compact construction, even at high transmissions, permits a narrow turbine train with generators of very small sizes. The axial forces resulting from the operation of the turbines are absorbed by an oil-filled tilting pad bearing in the gear unit and conducted into the base via the housing. The individual segments can be inspected and/or replaced without disassembling the gear unit.

All of the components are designed for permanent, wear-free operation with gearing of the highest quality and a correspondingly long service life. The use of the gear units enables the deployment of fast-running generators with a small air gap. Despite the unavoidable gear efficiencies, the efficiency of the power station is improved by approximately 1% through the use of gear units.


Hydro power planetary gear units

Compact, extremely lightweight design

Integrated high-speed couplings and coupling guards

Integrated axial bearing for absorbing turbine forces

Compensation of external thermal axial forces

Co-axial shaft arrangement (no center distance)

Low noise emissions due to double-walled housing

Highly efficient, even during partial-load operation

Optionally available in a flange version (no base)

Operation between idling and full load possible

Wear-free slide bearings

Design with through bore for blade adjustment optionally available

Technical data

1–20 MW
Low speed:
10–300 rpm
High speed:
500–5,000 rpm
PAR 1–10
PBR 10–16


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Enhanced productivity for your hydro power station

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Efficiency and reliability for your power plant

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