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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.
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