Hydraulic cylinders, also known as ‘hydraulic rams’, get their power from pressurised hydraulic fluid, normally hydraulic oil.
The hydraulic cylinder consists of a cylinder barrel, in which a piston connected to a piston rod moves back and forth. The barrel is closed on each end by the cylinder bottom – also called the cap end – and by the cylinder head where the piston rod comes out of the cylinder. The piston has sliding rings and seals. The piston divides the inside of the cylinder in two chambers, the bottom chamber, cap end, and the piston rod side chamber, ‘rod end’. The hydraulic pressure acts on the piston to do linear work and motion.
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.
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