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HFW for hydrostatic fan drives

 
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The Hydraulic Flywheel HFW when combined with a hydrostatic fan drive can also be applied to buses. In this configuration, no separate HFW unit is installed as the fan pump is used for the HFW-function.

Parallel to the fan operation and when the diesel engine is in coasting mode, the axial piston unit can collect and store the vehicle’s braking energy by charging a hydraulic accumulator under pressure. The stored energy can be reused for the supply of the fan drive and for the support of the combustion engine.

Through a specific tuning of the HFW to the vehicle, significant fuel savings can be achieved.