Displacement

In fluid technology for hydraulic motors , displacement or displacement is the amount of hydraulic fluid that the hydraulic motor consumes per revolution. The term is applied in a similar way to water turbines .

With adjustable hydraulic motors, the displacement is variable.

The power P delivered by a hydraulic motor is directly proportional to the displacement V , the speed n and the pressure drop Δp , taking into account the volumetric and mechanical-hydraulic efficiency :

${\displaystyle P={\frac {V\cdot n\cdot \Delta p}{60}}\cdot \eta _{vol}\cdot \eta _{mh}}$

The product of displacement and speed gives the volume flow Q . The pressure gradient is the difference between the pressure of the incoming hydraulic fluid (mostly pump pressure) and the pressure of the outgoing hydraulic fluid (mostly tank pressure).

literature

• D. Merkle, B. Schrader, B. Thomes: Hydraulics . Elementary level. Ed .: Festo Didactic GmbH & Co. KG. Springer, 2013, ISBN 978-3-662-07826-6 .