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Motion, Gears & Drives

Hydro Power Planetary Gear Units


2 september 2021 Leestijd 2 minuten

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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 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.


  • 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

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Alexander Dewaele


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