AXIAL PISTON SWASH PLATE PUMP :-
The pump has a circular cylinder block with axial cylinders disposed on a pitch circle around a central bore which is machined with splines to suit the input shaft with which it revolves. The individual cylinders are parallel with the shaft, with one end of each terminating in a drilled port at the end face of the block.
The axial pistons get the drive from a tilting swash plate, slipper pads bear against the swash plate face and the plungers are driven in and out axially for each revolution of the rotor. For one direction of tilt ports on one side of the horizontal centre line become suction and on the other side of this centre line become discharge. For the opposite direction of tilt, the direction of flow is reversed. The quantity of discharge depends on the angle of tilt. In mid-position no -relative movement between piston and end plate and no pumping action takes place.
Hastie axial-cylinder pump (John Hastie and Co Ltd)
VARIABLE DELIVERY PUMP
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