CALCULATION AND HYDRAULIC CYLINDER DESIGN

 For the design of hydraulic cylinders, speed and power must be calculated in dependence of the existing pressure in the cylinder space and the volume flow available.

For this, the admissible values for the operating pressure in dependence of the pressure series and the admissible oil speed in the hydraulic ports must be taken into account.

Formula symbol
Dk Bore
ds Piston rod diameter
p Pressure in cylinder
A1, A2 Working areas of cylinder
F1, F2 Force extending and force retracting of cylinder
v1, v2 Travel speed
Q1, Q2 Flow rate


Hydraulic cylinder designers need to think about the scale and size of a hydraulic cylinder. A cylinder that has an excessive reach poses the risk of buckling – meaning that the rod and barrel have to be engineered to be larger. However, this increase in area would have a bigger force, potentially over engineering the fabrication and making it heavier.

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