The axial piston pump with variable displacement
The animation shows how the displacement of an axial piston pump can be adjusted. In this example we use an axial piston pump with a rotating cilinder barrel and a static' swashplate. The cilinder barrel is driven by the drive shaft which is guided through a hole in the swashplate. The position (angle) of the swashplate determines the stroke of the pistons and therefore the amount of displacement (cm3/omw) of the pump. By adjusting the position of the swashplate the amount of displacement can be changed. The more the swashplate turns to the vertical position, the more the amount of displacement decreases. In the vertical position the displacement is zero. In that case the pump may be driven but will not deliver any oil. Normally the swashplate is adjusted by a hydraulic cilinder built inside the pumphousing.